Pickup unit for use in an optical information record/reproduce s

Details Pickup unit for use in an optical information record/reproduce s Pickup unit for use in an optical information record/reproduce s

1986-03-18

1988-02-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, G11B 700

Patent

active

047275294

ABSTRACT:
A pickup unit for use in an optical information record/reproduce system comprising a plurality of optical elements including a light-emitting device and an objective lens by which the light issuing from the light-emitting device is focused as a beam spot on the recording surface of a recording medium, a retaining mechanism that holds the plurality of optical elements and which is movable in a direction parallel to the recording surface, and a tilt servo mechanism for causing the optical axis of the beam spot to intersect the recording surface at right angles. The tilt servo mechanism includes a sensor for detecting the angle of inclination of the optical axis in relation to the recording surface. The sensor has a sensor stay as an integral part thereof. The sensor stay is provided as an integral part of the retaining mechanism and is movable with respect to the recording surface.

REFERENCES:
patent: 4607357 (1986-08-01), Okano
patent: 4634853 (1987-01-01), Kanamaru

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