Optical pickup including waveguide light intensity detection mea

Details Optical pickup including waveguide light intensity detection mea Optical pickup including waveguide light intensity detection mea

1991-10-17

1993-08-03

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369122, 369 4412, G11B 7125

Patent

active

052335950

ABSTRACT:
An optical pickup comprises a substrate, an optical waveguide formed on the substrate, a semiconductor laser attached to the optical waveguide, and a grating formed on the optical waveguide and converging a waveguide light in the optical waveguide to an optical recording medium. On the substrate, there are provided a first light detector for detecting the waveguide light reflected from the optical recording medium, and a second optical detector for detecting the intensity of the waveguide light being guided in the optical waveguide. The quantity of laser beam light emitted from the semiconductor laser is controlled to be constant based on an intensity signal detected by the second light detector.

REFERENCES:
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4779259 (1988-10-01), Kono et al.
patent: 4861128 (1989-08-01), Ishikawa et al.
patent: 4887255 (1989-12-01), Handa et al.
patent: 4893296 (1990-01-01), Matsumoto et al.
The Institute of Electronics, Information and Communication Engineers, 1986/5, vol. J69-C, pp. 609-615.

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