Photodetector for hologram-type optical head including means for

Details Photodetector for hologram-type optical head including means for Photodetector for hologram-type optical head including means for

1988-08-30

1991-03-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4441, G01J 120

Patent

active

050013343

ABSTRACT:
A photodetector for a hologram-type optical head comprises, as a basic constitution, 6-piece-divided photodiodes. In order to prevent the photodetector from receiving the influence of wavelength variation of a laser diode, that is, spot deviations, one photodiode is divided into two small elements and the spot deviation is detected by utilizing the difference between outputs of the two small elements.

REFERENCES:
patent: 4612437 (1986-09-01), Ohsato
patent: 4614863 (1986-09-01), Sato
patent: 4663750 (1987-05-01), Hamanaka et al.
patent: 4695158 (1987-09-01), Kotaka et al.

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