Optics: image projectors – Plural projection paths with single light source
Patent
1975-03-28
1976-06-22
Corbin, John K.
Optics: image projectors
Plural projection paths with single light source
350 55, 350137, 353 7, G02B 2120, G02B 1700, G02B 2724, G03B 2100
Patent
active
039648184
ABSTRACT:
A single field mirror serves as a relay for paired images being magnified by a stereo magnifier from an object to a spatial location removed from the field mirror for remote stereo viewing. A simple or compound stereo magnifier or microscope having paired optical paths receives the image of the object for each ocular path and projects each image to the plane of the single field mirror. The ocular path for each eye between the object and paired eyes of the viewer is routed off axis from the mirror in two aspects, typically by a periscoping system. The left eye path approaches the field mirror typically below and from the right of the field mirror axis; the right eye path approaches the field mirror typically below and from the left of the field mirror axis. Upon impingement and reflection of the routed eye paths at the field mirror, reversal of the routed eye paths occurs to remotely reflect a stereo magnified image with binocular image parity for remote view. The left eye path leaves the field mirror above and to the left of the field mirror axis; the right eye path leaves the field mirror above and to the right of the field mirror axis. The periscoping system is typically placed immediate to or in the magnifier optics in a prism array (which preferably includes a prism). Light for one eye path is totally reflected at a first prism wall to cross under the mirror axis and pass normally to and out of the prism at a second wall. A plane mirror or combination of mirrors relays the object image for one ocular to the plane of the field mirror. Likewise, light for the other eye path is totally reflected at the second prism wall to cross under the mirror axis and pass normally to and out of the prism at the first wall. Another plane mirror or combination of mirrors relays the object image for the other ocular to the plane of the field mirror. The stereo images thus cross each other in space interior of the prism. The images are then relayed to the plane of the field mirror. However, the magnifier exit pupil for each ocular is relayed in space a distance from the field mirror. Each eye of the viewer when positioned at each relayed pupil only views that part of the stereo view intended for that particular eye. This stereo viewing does not generate appreciable coma, astigmatism, spherical aberration and distortion associated with the off-axis use of a conventional spherical field mirror.
REFERENCES:
patent: 3196742 (1965-07-01), Sparling
patent: 3225647 (1965-12-01), Robinson et al.
patent: 3418033 (1968-12-01), Hope
patent: 3447854 (1969-06-01), Minter
patent: 3572893 (1971-03-01), Bennett et al.
patent: 3704932 (1972-12-01), Schick
Corbin John K.
Henry Jon W.
Humphrey Instruments Inc.
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