What are Fresnel Prisms & Aspheric Lens? - fresnell
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In order to determine the absolute minimum resolvable spot that can be seen on the object, the ratio of the field of view to the sensor size needs to be calculated. This is also known as the Primary Magnification (PMAG) of the system.
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Known Parameters:Pixel Size = 3.45μm x 3.45μmNumber of Active Pixels (H x V) = 2448 x 2050Desired FOV (Horizontal) = 100mm
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While one can quickly jump to the limiting resolution on the object by using the last formula, it is very helpful to determine the imaging space resolution and PMAG to simplify lens selection. It is also important to keep in mind that there are many additional factors involved, and this limitation is often much lower than what can be easily calculated using the equations.
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Appendix - By increasing refractive index of glass, light can propagate at larger critical angle by TIR (total internal reflection). This means image can be input at wider incident angle (i.e. large original image area) – see left Figure below. Also, by having a large output DOE area, it makes possible to have more tolerance against eye position movement – see right Figure below. For these reasons, high refractive index and large DOE area can support more natural visions for users providing real AR experiences.
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Generally when developing an application, a system’s resolution requirement is not given in lp/mm, but rather in microns (μm) or fractions of an inch. There are two ways to make this conversion:
So far, AGC have provided various products in this market such as glass packaging substrates and optical components, and now we are ready for production of high refractive index glass substrates after years of R&D efforts.Because AR images propagate inside the glass by TIR, the glass material needs to have high refractive index (large FOV) and low propagation loss (see Appendix). Also equally important are glass processing technologies to enable very flat and smooth surface. Our newly developed high refractive index meets all these requirements. We will launch large volume manufacturing facilities in Japan, and plans to expand production to support emerging applications as well as AR glasses & head-up display markets.
AGC's high refractive index glass substrates feature all the characteristics required for large Field of View and high image quality for glass substrates used in next-generation displays.
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AGC has successfully developed glass substrates for AR/MR glasses and established a mass production system for them. AGC's high refractive index glass substrates feature high refractive index, high transmittance, high flatness and surface smoothness.
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The ratio associated with system PMAG allows for the scaling of the imaging space resolution which tells us the resolution of the object.
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Recent advancement in wearable displays transforms everyday life, working environment, shopping experiences with augmented reality. AR glasses are emerging hardware for AR experiences with see-through display which overlays virtual images to mix real and digital world (aka mixed reality). As AR glasses give digital information to users as shown in the Figure above, the market is expected to grow like smartphone.