Laser power control of an optical head with a plurality of beam

Details Laser power control of an optical head with a plurality of beam Laser power control of an optical head with a plurality of beam

1994-06-02

1995-11-21

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 4432, 369 4437, 369 4414, 369116, G11B 700

Patent

active

054694230

ABSTRACT:
An optical recording apparatus which reduces light loss by expanding the laser beam diameters irradiated from a plurality of beam sources, and reducing the expanded beam diameters immediately before focusing the beams onto an information recording/reproducing medium to make the beams circular, thereby minimizing deviation of the laser beam from the optical axis.
An optical system for use in recording apparatus with a multi-beam optical head provided with a plurality of laser beam sources in a fixed unit which reduces light loss by minimizing deviation of the laser beam from the optical axis, and also by maintaining the laser power of each laser beam at a predetermined intensity independent of changes in distance between the fixed unit half and the moving unit half of the optical system by detecting intensities of the laser beams focused on a recording medium.

REFERENCES:
patent: 4333173 (1982-06-01), Yonezawa et al.
patent: 4841510 (1989-06-01), Yoshizawa
patent: 4942584 (1990-07-01), Karaki et al.
patent: 5067117 (1991-11-01), Shimizu et al.
patent: 5223970 (1993-06-01), Oono et al.
patent: 5359588 (1994-10-01), Fujita et al.
Sanyo SDL-9952 "4-Beam Laser Diode" (Jul. 1989).

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