Optical: systems and elements – Extended spacing structure for optical elements – Wide angle
Patent
1992-02-03
1993-06-22
Henry, Jon W.
Optical: systems and elements
Extended spacing structure for optical elements
Wide angle
359744, 359894, 359600, G02B 702, G02B 2314, G02B 2504, G02B 2316
Patent
active
052219925
ABSTRACT:
A doorscope comprising an inner tube which encases two sets of lenses, the one set being the object lens set, encased in the outer, or external portion of the doorscope, and composed of two opposed and adjacent concave lenses, and the other lens being an ocular lens of a convex design, and encased in the internal portion of the inner tube. An outer tube is screwed onto the inner tube, and, having a retaining flange on its outer end, holds the doorscope firmly against the outer surface of the door. An adjusting tube, having an enlarged diameter, milled surface area, is screwed onto the inner, or interior end of the inner tube, and is tightened against the inner surface of the door, using the milled gripping surface, thereby requiring no tools To prevent danger to the viewer when placing their eye against the doorscope, a rubberized hood is affixed onto the inwardly protruding end of the adjusting tube, thereby allowing the viewer to place their eye against the doorscope without danger to the eye.
REFERENCES:
patent: 2229594 (1941-01-01), Seiler
patent: 4116529 (1978-09-01), Yamaguchi
patent: 4730911 (1988-03-01), Wood et al.
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