| 摘要 |
<p>A spyhole viewer for a door or wall, having an objective system for producing a real, inverted image and mounted in a tubular member fixedly installable in the door or wall, at least one reflector for angularly deflecting the light beams from the objective system, an erector for inverting the inverted image and located behind at least one of the elements of the objective system, an image surface upon which the real image will appear, a housing fixedly attachable to the tubular member and accommodating at least the reflector and a projection lens mounted therein in coaxiality with the optical axis as deflected by the reflector. The optical axis is angularly deflected at least once on its way from the optical system to the viewing lens. <IMAGE></p> |
