Optical Projection System
First Claim
1. An optical projection system, comprising:
- an image generation element;
a projection lens set for receiving an image from the image generation element, refracting the image and projecting the image out, wherein the projection lens set comprises an aspherical lens with a distortion coefficient larger than 0.5 for producing a pincushion distortion of the image and several other lenses, and the absolute value of the sum of distortion coefficients of the other lenses are less than the distortion coefficient of the aspherical lens; and
a reflector for reflecting the image from the projection lens set, and projecting the image to a screen, wherein the reflector is capable of compensating the pincushion distortion of the image produced by the projection lens set.
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Abstract
An optical projection system includes an image generation element, a projection lens set for receiving an image from the image generation element, refracting the image and projecting the image out, and a reflector for reflecting the image from the projection lens set and projecting the image to a screen. The projection lens set includes an aspherical lens with a distortion coefficient larger than 0.5 for producing a pincushion distortion of the image and several other lenses, and the absolute value of the sum of the distortion coefficients of the other lenses are less than the distortion coefficient of the aspherical lens. The reflector produces a barrel distortion to the image for compensating a pincushion distortion of the image produced by the projection lens set.
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Citations
15 Claims
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1. An optical projection system, comprising:
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an image generation element; a projection lens set for receiving an image from the image generation element, refracting the image and projecting the image out, wherein the projection lens set comprises an aspherical lens with a distortion coefficient larger than 0.5 for producing a pincushion distortion of the image and several other lenses, and the absolute value of the sum of distortion coefficients of the other lenses are less than the distortion coefficient of the aspherical lens; and a reflector for reflecting the image from the projection lens set, and projecting the image to a screen, wherein the reflector is capable of compensating the pincushion distortion of the image produced by the projection lens set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification