Optical: systems and elements – Compound lens system – Right angle inspector
Patent
1994-07-18
1996-08-27
Shafer, Ricky D.
Optical: systems and elements
Compound lens system
Right angle inspector
359400, 359431, 359504, 359599, 359707, 359836, 359857, G02B 2302, G02B 2504
Patent
active
055506739
ABSTRACT:
A spyhole viewer for a door or wall, includes an objective system for producing a real, inverted image. The objective system is mounted in a tubular member fixedly installable in the door or wall. An erector is provided for inverting the inverted image of the objective system and is located behind at least one of the elements of the objective system. At least one reflector is provided for angularly deflecting the light beams from the objective system, and a housing is fixedly attachable to the tubular member for accommodating at least the erector and the reflector. A viewing lens is provided for magnifying the real image as inverted by the erector means. The viewing lens is adapted to swivel in a substantially vertical plane about an imaginary horizontal axis at a radius of swivel at least approximately equal to the length of the light path from the image-side focal plane of the objective system to the first principal plane of the viewing lens.
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