Photodetector and optical pickup device

Details Photodetector and optical pickup device Photodetector and optical pickup device

2006-08-15

2006-08-15

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053260, C369S112010, C369S044410, C369S047500

Reexamination Certificate

active

07092346

ABSTRACT:
A photodetector and optical pickup device which comprises: a monitoring photodetection element (photodiode)23for receiving laser beams having different wavelengths from laser light sources; a light source-discriminating photoreceiver24represented by a photodiode (240) and a wavelength selection filter (241) for discriminating the wavelength spectra of the laser light sources; and a sensitivity regulation circuit (25) for regulating the sensitivity of the monitoring photodetection element23in response to the light source-discriminating photoreceiver24.

REFERENCES:
patent: 6445670 (2002-09-01), Oshima
Patent Application No. 2002-008263 Published on Jan. 11, 2002 in the name of inventor Takahashi Yoshitaka (applicant Ricoh Co. Ltd.) in Japanese with an English Abstract.

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