Optical peephole device insertable in thick walls for panoramic

Details Optical peephole device insertable in thick walls for panoramic Optical peephole device insertable in thick walls for panoramic

1978-09-13

1981-03-24

Corbin, John K.

350 54, 350319, G02B 2100, G02B 2504

Patent

active

042576709

ABSTRACT:
An optical device insertable through a peephole in the thick wall of a chamber such as a bank vault, making it possible for an observer to obtain a panoramic view of objects dispersed within the interior thereof. The device is constituted by an optical system composed of three lens assemblies disposed serially along a common optical axis. The first assembly has wide angle characteristics to develop in front of this assembly a virtual image of the objects in the interior. The second assembly has an elongation nearly equal to the thickness of the wall, the second assembly having convergent characteristics to derive from the virtual image a final image which is formed adjacent the exit of this assembly. The third assembly has accommodation characteristics to permit an observer's eye located behind it to see the final image with an apparent diameter essentially equal to that at which the initial image can be seen at the entry of the second assembly. As a consequence, an observation of objects through the optical system is essentially equivalent in image quality to that obtainable had the observation of the initial image been made directly with the first and third assemblies.

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