Cover member for covering an optical system of an optical head d

Details Cover member for covering an optical system of an optical head d Cover member for covering an optical system of an optical head d

1993-01-25

1993-12-07

Britton, Howard W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4417, 360 9702, 360129, G11B 712

Patent

active

052688925

ABSTRACT:
An optical head includes an objective lens for converging a light beam emitted from a light source onto a rotating recording medium, a carriage for holding the objective lens, a fine adjusting device for finely moving the carriage along an optical axis of the objective lens and/or a tracking direction and a movable head portion. The movable head portion is provided with a first opening facing the objective lens and a second opening connected to the first opening. The second opening is located off the optical path and has a dust filter mounted therein. Such a construction of the optical head prevents dust or the like from entering into the inside of the optical head due to the negative pressure generated upon rotation of the recording medium.

REFERENCES:
patent: 4006294 (1977-02-01), Canino
patent: 4857087 (1989-08-01), Bolton et al.
patent: 4958336 (1990-09-01), Suzuki et al.
patent: 5023858 (1991-06-01), Nakayama

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