Optical system for a television camera with a bias-light emittin

Details Optical system for a television camera with a bias-light emittin Optical system for a television camera with a bias-light emittin

1975-04-04

1976-05-11

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 787, H04N 530

Patent

active

039565840

ABSTRACT:
An optical system for a television camera provided with a device for emitting bias-light which is directed to the image pickup tube. Rays of light coming from a light source and entering a light guide plate at a side edge thereof are guided through the interior of the plate toward the opposite side edge after a number of successive total internal reflections from the two boundary surfaces of the plate. The surface of the plate near to the image pickup tube is provided with a diffraction grating formed therein to diffract a fraction of the light rays entering the plate, and to direct it toward the image pickup tube, thereby the image pickup tube is illuminated by the diffracted rays of light.

REFERENCES:
patent: 3610818 (1971-10-01), Bachmann
patent: 3767846 (1973-10-01), Okubo
patent: 3905676 (1975-09-01), Ulrich

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