Light emitting apparatus having a plurality of light emitting po

Details Light emitting apparatus having a plurality of light emitting po Light emitting apparatus having a plurality of light emitting po

1989-10-30

1991-05-21

Gonzalez, Frank

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

050181270

ABSTRACT:
In a light emitting apparatus, a semiconductor laser has first and second laser structures provided with first and second laser beam emitting points, respectively, and a retrieving or recording laser beam and an erasing laser beam are emitted from the first and second laser emitting points of the laser structures, respectively. A cylindrical lens is located in front of the second laser beam emitting point so that the erasing laser beam is converged in a first plane and is not converged in a second plane normal to the first plane. The erasing laser beam emerged from the cylindrical lens is converged onto a recording surface of a recording medium by an objective lens to form an elliptical beam spot on the recording surface.

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