Optical reception apparatus using prism having caldera-shaped co

Details Optical reception apparatus using prism having caldera-shaped co Optical reception apparatus using prism having caldera-shaped co

1991-08-13

1992-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359831, H01J 314

Patent

active

051591880

ABSTRACT:
An optical reception apparatus comprises of a prism made by forming in a member of substantially the frustum of a circular cone made of a transparent material a concave portion of a substantially circular cone or substantially the frustum of circular cone whose diameter is gradually reduced in the direction from a small diameter circular outer side surface to a large diameter circular outer side surface of the frustum of the circular cone, and a light receiving element mounted on the prism at its position along a center line of a circle of the large diameter circular outer side surface and also in the vicinity of the large diameter circular outer side surface.

REFERENCES:
patent: 3442571 (1969-05-01), Itzkan
patent: 3840738 (1974-10-01), Indig
patent: 4277148 (1981-07-01), Clegg
patent: 4567879 (1986-02-01), Clegg
patent: 4743112 (1988-05-01), Burke
patent: 4915489 (1990-04-01), Minko

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