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Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Creating a good-quality coated optic from a plastic substrate depends heavily on proper cleaning and handling of the parts prior to deposition. Many polymer materials scratch very easily when compared to glass and without proper cleaning, adhesion will be compromised.

Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Chemical exposure tests: Insect repellent Penetrating oil Antifreeze Carbon-removing compound Lubricating oil Rifle-bore cleaning compound Vacuum-pump oil

With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

The deposition of optical coatings on plastic or polymer substrates brings several challenges. Plastic optics cannot withstand the typical 250°C coating temperatures used for glass, nor the extended exposure required to apply hundreds of optical layers for complex spectral profiles. Optical coatings on plastics are also more prone to delamination, peeling, and flaking if not properly applied—particularly when subjected to harsh environmental conditions. This can place optical and environmental performance at odds, as an increase in the number of layers to achieve the desired spectral profile can increase stress between the substrate and coating, particularly during temperature cycling.

Smart Vision Lights is the leading designer and manufacturer of LED lighting solutions for any type of machine vision or automation camera application.

All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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Return to video topics. Go to other topics. In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

While deployment of coated plastic optics once meant choosing between optical performance and durability, advances in cleaning and deposition processes for polymer substrates have closed the gap. The majority of optical coatings available on glass can now be replicated on plastic, and with MIL-SPEC and ISO reliability. In the hands of an experienced coating provider, it is even possible to create a drop-in replacement for a glass component to reduce weight, cut cost, or allay safety issues associated with cracking and splintering in the field. With the capabilities and options in coated plastic optics increasing so significantly in the past decade, they're certainly worth another look.

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Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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This is an explanation of the fresnel (pronounced "fur-nell" or "frenell") lens panel in a rear projection TV. Return to video topics. Go to other topics. In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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Once dismissed by serious optical engineers, plastic optics (also known as polymer optics) have come into their own in the last 10-20 years. The introduction of advanced optical polymers and improvements in fabrication techniques now allow designers to replace even high-end glass optical components with plastic at a fraction of the weight or price, facilitating use in medical, industrial, and defense and security applications (see Fig. 1). Advances in optical coating technology for plastics have been key to this transition, enabling the delivery of comparable optical performance and durability despite the use of a very different class of substrate material.

ProjectionTV fresnel lens

In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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Go to other topics. In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Even without active heating of the deposition chamber, there is a certain amount of inherent heat in the deposition process itself, requiring careful attention to coating rates to prevent damage. The throw distance in the chamber can help to control heat, as does the use of different material—some of the high-index layers are formulated using rare earths.

If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

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The relatively low melting point of most plastics requires the use of low-temperature deposition processes such as plasma ion-assisted deposition (plasma-IAD) or plasma-enhanced chemical vapor deposition (PECVD). Deposition temperatures as low as 40°-50°C are not uncommon to prevent deformation or warping of the substrate, particularly for a softer material like acrylic. Plasma parameters are adjusted to fine-tune optical performance, as well as to modify surface properties and adjust coating stresses that can impact environmental performance.1

Adhesion of optical coatings to plastics or polymers is not as strong as to glass. When compounded with differences in thermal expansion coefficients and thickness variations in the optic itself, it can limit the number of layers that can be deposited without compromising environmental performance. Pretreatment using low-pressure plasmas of argon (Ar), helium (He), or nitrogen (N2) has been shown to improve coating adhesion, stress compensation, and mechanical durability. Not only does this process serve to clean and micro-etch the surface in preparation for coating, but it can also offer crosslinking and surface-chemical functionalization.2

A crystal structure containing Sodium: Ball-and-stick model of sodium ... The most common compound in which it occurs is sodium chloride (table salt).

These competing demands have forced coating providers to revamp their processes from start to finish, developing specialized cleaning, handling, design, and coating methods—often for each plastic type. As a result of this investment, optical coatings on plastic from experienced vendors are now capable of delivering similar optical performance as available on glass. From antireflection (AR), mirror, and indium tin oxide (ITO) coatings to filters, beamsplitters, and hot mirrors, coated plastic and polymer optics now regularly pass the most stringent MIL-SPEC and ISO testing schedules.

An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

We offer Aspheric Condenser Lenses in different diameters and focal length. We can also provide you an anti-reflection coating for your lens upon request.

Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

ProjectionTV lens

Components like lenses, prisms, and windows are typically cleaned ultrasonically using material-specific chemicals and surfactants, followed by a hot rinse in deionized water and a hot air-dry to avoid damage. Hand cleaning may also be used, and each coating vendor should draw on their experience to select the best detergent solution to correct specific cleaning or adhesion issues. Sheet materials require their own unique handling methods to avoid damage and ensure cleanliness prior to coating, as well as specialized fixtures.

Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Extensive pretreatment is not always necessary, however. Binder layers are an alternative to improve adhesion of metal coatings such as gold, while some advanced cyclic olefin copolymers like Zeonex and TOPAS provide excellent adhesion properties.

GiantFresnel Lensprice

Perhaps the most complex aspect of coating on plastic substrates is the tremendous variety and complexity of the materials available. Each has its own unique chemistry that interacts uniquely with the cleaning, preparation, and deposition processes employed, together defining the stress at the coating-substrate interface. This can constrain the optical performance of a coating required to pass specific environmental or MIL-SPEC testing. It also means that a coating that passes a given test on one type of plastic or polymer is not guaranteed to pass on another simply by using the same process, nor for every substrate shape or form.

Ultrafast Laser Group home · Intense laser-matter interactions · Nonlinear optics · Short-pulse, intense laser systems.

The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Fresnel Lenses (for Rear Projection TV) Updated 11/5/05 This is an explanation of the fresnel (pronounced "fur-nell" or "frenell") lens panel in a rear projection TV. Return to video topics. Go to other topics. In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

AGC's high refractive index glass substrates feature all the characteristics required for large Field of View and high image quality for glass substrates ...

The field of view (FOV) for a sensor system is the span over which a given scene is imaged. Although it may seem at first that the aperture size might determine ...

The development of a deposition process and layer design must therefore treat the optical specifications, environmental requirements, substrate form, and choice of substrate material as linked parameters. A coating partner with extensive experience in coating a wide variety of plastic types and form factors can provide valuable advice early on in the design process to ensure the specification of manufacturable components with the best possible optical performance. Given the extended testing required for each component to prove environmental reliability prior to deployment, this consultation process with an experienced coating partner is a key risk mitigation step in the timeline of any major product or system development.

Updated 11/5/05 This is an explanation of the fresnel (pronounced "fur-nell" or "frenell") lens panel in a rear projection TV. Return to video topics. Go to other topics. In a Nutshell The screen of a rear projection TV set (RPTV) has two or three layers. The panel with a concentic circular panel, seen only if you look inside, is the fresnel lens. It redirects the light rays to all be parallel, directly out from the screen. If you ever dismantle the screen of an RPTV, you must be sure to re-install the fresnel lens with the ridged surface facing forwards. Also the fresnel lens must be behind the lenticular lens (ribbed) panel or frosted (diffusion) panel. Just before reaching the screen, the light rays from the projection unit down below are ever spreading out (diverging). The purpose of the fresnel lens is to aim, or redirect, all of the light rays to be parallel, directly out of the TV set. An ordinary convex lens will do this job. But it must be as large as the screen and it would be thick, heavy, and expensive. A fresnel lens has the same curvatures as an ordinary lens, redirects (refracts) the light the same way, but is collapsed down. For the RPTV, the fresnel lens has thousands of ridges in a circular pattern and is a panel about one eighth to one quarter of an inch thick overall. An ordinary lens can have the curved surface facing either way, requiring only minor calibration differences for focusing. A fresnel lens must be positioned so the ridged surface is on the side of the parallel rays, which means outwards for an RPTV. Note that on the fresnel lens, some of the surfaces of the ridged side are perpendicular to the flat surface and the other surfaces are not. The light rays will miss the perpendicular surfaces when the flat side is facing inwards, towards the projection units. This ensures that all of the light rays come out parallel. With the fresnel lens reversed, light rays will hit the perpendicular surfaces. (An ordinary lens does not have these perpendicular surfaces.) When this happens the rays will go off in many different directions (scatter). The rays don't have to go far (just another 1/8 to 1/4 inch) before reaching the front screen surface but you will see excessive haloing. The lenticular lens is also a panel 1/8 to 1/4 inches thick. It takes some light rays from each spot on the screen and redirects them to each side while directing less light upwards and downwards. This gives a more even brightness for viewers sitting off to the sides. The diffusion panel (a frosted panel optionally used instead of the lenticular lens) does not have the graininess caused by the rib spacing of a lenticular lens. It allows more light to travel upwards and downwards necessitating more brightness from the projection unit to give the viewers an equivalent picture. Fresnel lenses come in different shapes for different purposes. Some are equivalent to concave lenses as opposed to convex lenses. Click here for more information: http://www.3dlens.com Go to our video hints page Go to table of contents Contact us All parts (c) copyright 2000, Allan W. Jayne, Jr. unless otherwise noted or other origin stated. If you would like to contribute an idea for our web page, please send us an e-mail. Sorry, but due to the volume of e-mail we cannot reply personally to all inquiries.

Operating environment tests: 24-hour humidity exposure 10-day humidity exposure Temperature cycling: -62°C to +85°C Temperature shock: +23°C/-57°C/+71°C/+23°C Moderate abrasion Adhesion Salt solubility (not appropriate for metals) Salt fog (not appropriate for metals)