What is collimatorbeam

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Collimatordiagram

A collimated beam of light is defined when every ray within the beam is parallel to every other ray. To produce collimated light you can either place an infinitesimally small source exactly one focal length away from an optical system with a positive focal length or you can observe the point source from infinitely far away. In the real world, neither of these scenarios are possible. In addition, diffraction theory tells us that even if one of these scenarios were met, there would still be some divergence.

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To minimize divergence of a collimated beam two factors must be balanced: focal length of the collimating system and size of the light source. Equation 1 approximates the divergence of a collimated beam:

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Customers who use anti-reflection films have a range of requirements. These include blurring the reflected image, maintaining clarity while preventing reflections, and preserving color accuracy and gloss. In response to these diverse needs, Dexerials has developed a wide array of anti-reflection films (refer to the specification table below). Dexerials is committed to ongoing product development to meet customer expectations.

What is collimatorin X ray

The AG film features a resin layer filled with silica particles on top of a base film. This structure creates a bumpy surface that scatters light. When light hits this uneven surface, it reflects in various directions. The primary function of AG film is to scatter this reflected light, reducing the amount that reaches the viewer’s eyes.

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Anti-reflection film is currently used in various applications, including notebook PCs, tablet PCs, industrial displays, and in-vehicle displays like car navigation systems. Each application has different requirements based on user preferences and usage conditions. Four photos demonstrate the ceiling light reflection on glass with different combinations of AG and AR with varying haze levels. The three on the left show reflection on glass with “AGAR” anti-reflection film, each with different haze values (the degree of light diffusion). The higher the haze level, the greater the light diffusion and the whiter the overall appearance. The rightmost photo shows a “piano black” anti-reflection film without AG film, also developed by Dexerials.

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Dexerials has developed a film that combines the features of both AG and AR films. This is demonstrated in four photos of a ceiling fluorescent light reflected on a glass placed atop a black acrylic plate. The photos show plates with no film, AG film, AR film, and a combination of AG and AR film. The reflection of the fluorescent light varies significantly across all four. With AG film, the light appears blurred and white, while with AR film, the shape of the fluorescent light is dark but clearly visible. The combination of AG and AR film results in almost no reflection of the fluorescent light and a clear view of the black acrylic beneath.

Some level of divergence will always be present when collimating light. In the illustration below, both systems produce collimated light, however, Figures 2 and 4 have more divergence compared to Figures 1 and 3 due to the sources being larger. Figures 2 and 4 can be thought of as a collection of closely spaced ideal point sources. Individually, each point creates a ray bundle of parallel rays, but as a collection the series of “point sources” create a beam with some divergence. The divergence exists because, as the size of the source increases, the source’s distance from the optical axis increases, and thus the resultant ray bundle’s angle increases with respect to the optical axis.

In recent years, there’s been a growing demand for in-vehicle displays, such as car navigation systems, instrument clusters, and center information displays (CID) in luxury cars, to feature glossy black displays akin to a piano’s finish. This is to complement their opulent interiors. Dexerials’ piano black and low-haze anti-reflection films are increasingly being utilized, not just for in-vehicle displays, but also for tablets’ “beautiful black” displays.

However, AG film has a downside: it can cause screens to appear whiter and images to seem blurred. The size of the bumps on the film can affect visibility. For instance, AG film with larger bumps diffuses more light, leading to a whiter overall image as the left side image. Conversely, AG film with smaller bumps appears less white, but the outline of the reflected fluorescent light image is more distinct as following images on the right.

Moreover, as previously mentioned, the effectiveness of anti-reflection film using light interference is dependent on the viewing angle. Dexerials’ anti-reflection film is designed to minimize this dependence, resulting in products with low reflectance over a broader wavelength range. This feature is particularly important for in-vehicle displays, which are often viewed at an angle from the driver’s seat.

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There are two primary strategies for reducing reflection or glare. The first involves scattering (or diffusing) light, while the second cancels it out through light interference, leveraging the properties of light waves. The image above provides a simple illustration of how these two methods impact a display. On the left, you see an example of the scattering method. On the right is the method of suppressing reflection through phase control, and the middle image shows a display without any anti-glare (AG) or anti-reflection (AR) film. With the scattering method (left image), the reflection of the fluorescent light is blurred, and the entire screen appears slightly whitened. With the reflection suppression method (right image), some glare remains, but the image quality is clear.

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When light from a fluorescent or ambient source reflects off a tablet screen, it can make it challenging to see the display. Dexerials’ Anti-reflection (AR) film enhances screen visibility by minimizing this reflected light, also known as glare.

Anti-reflection films that diffuse reflections are referred to as anti-glare (AG) films, while those that reduce ambient light reflection are known as anti-reflection films (AR). The specifics of these two technologies are explained below.

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AR film is composed of a base film covered with layers of film with varying refractive indices. This film operates on the principle of destructive interference between light waves reflected at the interface and the surface. By adjusting the AR film’s thickness and material, it’s possible to control the light phase, reducing the reflected light that reaches the viewer’s eyes.

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To achieve ideal collimation, the size of the illumination source must be minimized or the focal length of the collimating system must be increased. Note that as you increase the focal length of the system, the system must be physically further away from the source. This means that less light will be captured by the focusing system and overall power in the resultant beam is decreased.

While AR film does suppress reflected light, changes in the viewing angle can shift the optical path length through the film. This shift can alter the amount of reflection reduction across some of the wavelength range, affecting the color of the reflection.

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