Optical information system having a birefringence plate movably

Details Optical information system having a birefringence plate movably Optical information system having a birefringence plate movably

1987-05-13

1988-08-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350401, G01J 132

Patent

active

047663030

ABSTRACT:
An optical information system includes an optical source emitting light. An information recording member is exposed to the emitted light. A beam splitter disposed between the light emitting source and the information recording member separates light reflected by the information recording member and light traveling from the light emitting source to the information recording member. A device detects intensity of the separated reflected light. A birefringence plate is movably disposed between the light emitting source and the information recording member. The birefringence plate is moved in accordance with the detected intensity of the separated reflected light.

REFERENCES:
patent: 4118736 (1978-10-01), Okada et al.
patent: 4374324 (1983-02-01), Van Rosmalen et al.
patent: 4381557 (1983-04-01), Jebens
patent: 4555620 (1985-11-01), Bridson et al.
patent: 4613961 (1986-09-01), Aarts
patent: 4623994 (1986-11-01), Nabeshima et al.

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