Optical head with built-in semiconductor laser, objective lens a

Details Optical head with built-in semiconductor laser, objective lens a Optical head with built-in semiconductor laser, objective lens a

1994-11-09

1996-09-10

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, 369 4423, 369122, G11B 700, G11B 712

Patent

active

055552323

ABSTRACT:
An optical head has a semiconductor laser for emitting light, a collimator lens for converting the light from the laser into a parallel light beam, a semiconductor substrate for reflecting the light beam, and an objective lens for focussing the light beam reflected from the substrate on the optical disk. A 1/4 wavelength plate is situated between the substrate and the objective lens. A beam splitter which transmits the light from the laser and reflects the light returning from the disk is provided between the collimator lens and the substrate. Following the beam splitter, a collective lens, a cylindrical lens and an optical detector are arranged in this order on an optical path for the returning light. A light receiving element for outputting a signal corresponding to the intensity of the light received is formed on the semiconductor substrate, and a polarizing film is formed on the surface thereof.

REFERENCES:
patent: 5285062 (1994-02-01), Lee
patent: 5337302 (1994-08-01), Gotoh et al.
patent: 5396061 (1995-03-01), Taniguchi et al.
patent: 5404009 (1995-04-01), Kando et al.
patent: 5438586 (1995-08-01), Ishii et al.
patent: 5446719 (1995-08-01), Yoshida et al.

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