Objective lens drive apparatus for a recording and reproducing d

Details Objective lens drive apparatus for a recording and reproducing d Objective lens drive apparatus for a recording and reproducing d

1995-12-22

1998-04-28

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 700

Patent

active

057454663

ABSTRACT:
The objective lens drive apparatus according to the present invention includes a movable member which can be moved along a surface of an optical information recording medium an objective lens installed on the movable member, for allowing a light beam to pass and for concentrating the beam onto an optical information recording medium, a first diaphragm member installed on the movable member, having a first opening for determining the diameter of the light beam passing, and a second diaphragm member such that the second diaphragm member can be excluded from or inserted into the light path of the light beam and has a second opening for determining the diameter of the light beam passing.

REFERENCES:
patent: 4125859 (1978-11-01), Oshida et al.
patent: 4375096 (1983-02-01), Gorog et al.
patent: 4773052 (1988-09-01), Sugiuma et al.
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5237557 (1993-08-01), Kasahara
patent: 5281797 (1994-01-01), Tatsuno et al.
Abstract; Hitoshi et al., Terasaki; patent; Feb. 25, 1994; 1p. only (JP6052549).
Abstract; Masamichi, Kondo; patent; Jan. 28, 1994; 1p. (JP6020298).

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