Two laser source optical pickup with a plano-convex lens to comp

Details Two laser source optical pickup with a plano-convex lens to comp Two laser source optical pickup with a plano-convex lens to comp

1999-06-10

2000-09-05

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369 4423, 369 4437, G11B 7135, G11B 709

Patent

active

061153494

ABSTRACT:
An optical pickup includes a first and second light-emitting elements, a light separating element, and an objective lens. A collimating lens is disposed in the first optical path connecting the first light-emitting element and the light separating element, and an optical element which produces a rotationally symmetrical wavefront aberration is disposed in the second optical path connecting the second light-emitting element and the light separating element. Light is emitted from the first light-emitting element when a thinner disk is used. Light passes through the light separating element and the objective lens to the disk. Light is emitted from the second light-emitting element when a thicker disk is used. Light passes through the light separating element and the objective lens to the disk. In the latter case, the optical element produces aberration to compensate aberration caused by the objective lens so that a small clean spot can be formed.

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patent: 5864523 (1999-01-01), Yoshizawa
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