Optical apparatus for optical pickup

Details Optical apparatus for optical pickup Optical apparatus for optical pickup

1990-04-13

1991-07-16

McElheny, Jr., Donald

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

050330420

ABSTRACT:
An optical apparatus of an optical pickup including a semiconductor laser, a collimate lens to obtain a parallel light from a laser beam emitted from said semiconductor laser, an objective for collecting on a recording surface of an optical disk the parallel light obtained through the collimate lens, and a light receiving element for detecting a reflection light reflected on the recording surface of the optical disk wherein a numeric aperture NA of said collimate lens is set as 0.14<NA<0.2.

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patent: 4689780 (1987-08-01), Ohara et al.
patent: 4744073 (1988-05-01), Sugiki
patent: 4773052 (1988-09-01), Sugiura et al.
patent: 4789978 (1988-12-01), Shikama et al.

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