Objective lens drive device

Details Objective lens drive device Objective lens drive device

1988-05-20

1989-01-03

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

350255, G11B 712

Patent

active

047962488

ABSTRACT:
A tracking error signal is generated by a far field system utilizing light for writing and reading of data. The true tracking error signal is retrieved from this tracking error signal by removing the position fluctuation component in the direction of tracking of the objective lens. A holding member that is supported on a frame and holds the objective lens is driven in the tracking direction in accordance with this true tracking error signal. In order to detect position fluctuation in the tracking direction of the objective lens, the light for position detection that is output from the holding member is detected by a photodetector fixed on a cover. The mounting position of the cover with respect to the frame is adjustable by rotating the cover, using the guide part formed on the frame.

REFERENCES:
patent: 4253723 (1981-03-01), Kojima et al.
patent: 4419614 (1983-12-01), Kimura
patent: 4566089 (1986-01-01), Kime
patent: 4571026 (1986-02-01), Maruta
patent: 4644516 (1987-02-01), Musha
patent: 4678276 (1987-07-01), Sekimoto et al.
patent: 4687296 (1987-08-01), Terayama et al.

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