Optical head, and information recording-and-regeneration...

Details Optical head, and information recording-and-regeneration... Optical head, and information recording-and-regeneration...

2005-11-15

2010-02-02

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S094000, C369S112240, C369S112020

Reexamination Certificate

active

07656775

ABSTRACT:
An optical head that is restrained from becoming larger, even if it is used for an optical-information recording medium that includes a plurality of information recording layers. In this optical head, a collimating lens is formed by a concave lens disposed on the side of a light source and a convex lens disposed on the side of an objective lens. A collimating-lens actuator moves the convex lens in a direction where a spherical aberration is cancelled which is generated according to the thickness of a light transmission layer up to an information recording layer of the optical-information recording medium. An aperture stop is provided on the side of the collimating lens with respect to the objective lens, and the aperture stop is located near the focal position of the convex lens on the side of the objective lens.

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MAT (machine assisted translation) of JP 2004-171682—all pages, no figures.
“Optical disk technology, the second edition”, pp. 60 to 62, published on Feb. 10, 1988, by Radio Technology along with partial English translation.

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