Optical head having semiconductor laser

Details Optical head having semiconductor laser Optical head having semiconductor laser

1993-05-27

1995-11-28

Willis, Davis L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 700

Patent

active

054714540

ABSTRACT:
In an optical head for reading information signals out of a plurality of information tracks on an optical record medium by projecting a slit-like light spot onto the optical record medium, a laser beam having a substantially elliptical cross section is passed through a stop having an aperture to shield both edge portions of the laser beam to obtain a laser beam having a uniform distribution. Then, the laser beam emanating from the stop is made incident upon a cylindrical lens have a negative power in a direction of a major axis of the laser beam to form a laser beam having a uniform distribution in a longitudinal direction. The thus obtained laser beam is projected onto the optical record medium by an objective lens such that the longitudinal direction of the slit-shaped laser beam spot is aligned with a direction substantially perpendicular to a track direction in which information tracks extend. In this manner, a plurality of information tracks are simultaneously illuminated uniformly, so that it is possible to obtain a plurality of information signals having substantially the same level.

REFERENCES:
patent: 5081617 (1992-01-01), Gelbart
patent: 5283778 (1994-02-01), Maeda

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