Optical: systems and elements – Binocular devices – Reflected line of sight
Patent
1995-06-07
1997-04-08
Lee, John D.
Optical: systems and elements
Binocular devices
Reflected line of sight
345 7, 359407, 359630, 359640, G02B 2722
Patent
active
056193734
ABSTRACT:
An optical system for a Head Mounted Display for a virtual reality system that employs a single high-resolution display to generate separate right-eye and left-eye images for presentation to a user. The display projects a single image onto an array of adjacent lenses that serve to magnify it, and to project the image onto an optically distant diffuser screen. The diffuser screen, which increases the angular dispersion of the image, is in close proximity to a columnar array of microprisms. The microprism beam splitter serves to split the single image into separate right-eye and left-eye component images, and to direct each component image to its respective eyepiece at an off-axis angle. The optical system further includes two separate eyepieces, each including Fresnel lens/prisms that redeflect their respective images onto optical axes which are parallel to, but laterally displaced from the original, central optical axis. Color correction is achieved by the use of a single diffraction grating that corrects the lateral color dispersion introduced by the deflecting Fresnel lens/prisms. A toroidal lens directly in front of each eye, but slightly displaced horizontally from the eye's optical axis, serves to equalize the angular magnification in the x- and y-directions, while symmetrizing the y-axis astigmatism about the center of the eye.
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Burstyn Herschel C.
Meyerhofer Dietrich
Hasbro Inc.
Lee John D.
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