Split type optical pick-up device

Details Split type optical pick-up device Split type optical pick-up device

1990-12-10

1992-03-10

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050954733

ABSTRACT:
A split type optical pick-up device suitable for use in an optical disc memory system has a two-part structure: stationary and movable optical systems which are provided separately. The stationary optical system includes a semiconductor laser for emitting a laser beam which is received by a deflecting member of the movable optical system. The thus deflected laser beam is focused onto an optical disc by an objective lens. The light reflecting from the optical disc passes through the objective lens in the reversed direction and also through the deflecting member to impinge upon a tracking error detector which is also provided in the movable optical system. Because of the provision of the tracking error detector in the movable optical system, there will be produced no offset in a tracking signal generated by the tracking error detector.

REFERENCES:
patent: 4322838 (1982-03-01), Neumann
patent: 4367921 (1983-01-01), Sawamua et al.
patent: 4571716 (1986-02-01), Szerlip
patent: 4644516 (1987-02-01), Musha
patent: 4667316 (1987-05-01), Suda et al.
patent: 4688201 (1987-08-01), Towner et al.
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4822139 (1989-04-01), Yoshizumi

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