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US 4,537,483 AGranted
Optical projection viewing system
OwnerRoger S. Turnerinventor
Life of this patent
Estimating the term…
Abstract
An improved optical projection viewing system is provided with a novel wide projection angle relay projection lens and a novel magnifying biocular viewing lens. The magnifying biocular viewing lens has non-symmetric front and rear biconvex surfaces having a uniform field distance when viewing the entire image on the viewing screen. The biocular viewing lens has positive distortion and color separation which is compensated for by negative distortion and color separation provided in the relay projection lens.
Claims19
An optical projection viewing system comprising:
- a viewing housing,
- an objective lens juxtaposed an object to be viewed,
- a relay projection lens in said viewing housing for projecting a wide field image from said object from said objective lens,
- a viewing screen in said viewing housing having a full field image projected thereon,
- a non-symmetric biocular viewing lens in said viewing housing intermediate said imaging screen and a person viewing said full image on said imaging screen,
- said biocular viewing lens having non-symmetric front and rear biconvex surfaces,
- said biconvex surfaces having different radius of curvature, whereby the light path distance from a point on said viewing screen to the eyes of the person viewing said screen is different and the field distance correction provided by said non-symmetric biconvex biocular viewing lens provides a uniform field distance to both eyes within one eighth of one diopter over said field of image.
4 more elements
An optical projection viewing system as set forth in claim one wherein said biocular viewing lens is a single element.
An optical projection viewing system comprising:
- a viewing housing,
- an objective lens juxtaposed an object to be viewed,
- a viewing screen in said viewing housing,
- an image magnifying relay projection lens in said housing for projecting an image from said objective lens onto said viewing screen, said relay projection lens having greater projecting magnification at the center than towards the edges resulting in negative distortion or barrelling of the projected image,
- a magnifying biocular viewing lens intermediate said viewing screen and a person viewing said screen,
- said biocular viewing lens having increasing magnification towards the edges as opposed to the center of the lens thereby introducing noticeable positive distortion, whereby, the combination of negative and positive distortion compensate for each other to provide an image which appears substantially non-distorted with linear magnification.
3 more elements
An optical projection viewing system comprising:
- a viewing housing,
- an objective lens juxtaposed an object to be viewed,
- a relay projection lens having a wide angle for projecting a wide field image of said object from said objective lens,
- a viewing screen in said viewing housing having a full image projected thereon from said relay projection lens,
- a biocular viewing lens in said viewing housing, intermediate said viewing screen and a person viewing said full image on said viewing screen from a distance of approximately three inches from said viewing screen,
- said viewing screen being less than ten inches from said biocular viewing lens adjusts said image to a field distance of approximately one diopter to said person viewing said full image,
- said field distance of said biocular lens measured as the distance from the eye of the person viewing said full image to a point from which the image appears being approximately one meter to reduce eye muscle strain.
4 more elements
An optical projection viewing system comprising:
- a viewing housing,
- an objective lens juxtaposed an object to be viewed,
- a relay projection lens in said viewing housing for projecting an image from said objective lens, said relay lens having a reticle image plane size greater than eighteen millimeters in diameter, and a full field projected image magnified greater than eight times,
- an imaging screen in said housing having the full image from said relay projection lens formed thereon,
- a biocular viewing lens having a magnifying power of approximately one in said housing intermediate said imaging screen and a person viewing said screen to provide a magnified image greater than eight times,
- said optical viewing system having a vision index between 150 and 200 where said vision index is defined as the product of the said field size in millimeters of said projection lens and the magnification of the object as seen as an aerial image by the person viewing the said imaging screen through said biocular viewing lens.
3 more elements
Dependencies are inferred from the claim text.