Patent
1986-11-28
1989-04-25
Corbin, John K.
350130, 350515, G02B 2122, G02B 2722
Patent
active
048242284
ABSTRACT:
A stereomicroscopic inspection system having low eyestrain features is disclosed. The system (10) includes an objective lens assembly (12) for forming an image of a viewed object (22). A prism mechanism (14) is positioned adjacent to the objective lens assembly (12) for orienting the image along a heads-up axis. A telephoto objective assembly (16) is positioned adjacent to the prism mechanism (16) for focusing the image transmitted through the prism mechanism (14). A reticle (18) is positioned adjacent to the telephoto objective assembly, and the image is focused (16) onto the reticle (18). An assembly (20) is positioned adjacent to the reticle (18) for enabling heads-up viewing of the object by the viewer, (22) said system projecting a virtual image at a predetermined distance from the viewer. This distance may be substantially equal to the eye's natural focusing distance to minimize eyestrain. The eyepiece means produces large D shaped exit pupils having an interpupillary diameter substantially equal to the average viewer's natural interpupillary distance. A common objective assembly reduces magnification differences between the left and right eye. The system has high resolution over a wide field of view with a long object to lens working distance and enhanced depth perception.
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patent: 4571038 (1986-02-01), Jako
Strittmatter Donald J.
Wickholm David R.
Corbin John K.
Hays R. A.
Hughes Aircraft Company
Kachmarik Ronald M.
Karambelas A. W.
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