Apparatus for servo-controlling objective lens in recording and/

Details Apparatus for servo-controlling objective lens in recording and/ Apparatus for servo-controlling objective lens in recording and/

1993-06-04

1995-05-02

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4441, 369 54, 369 58, G11B 709

Patent

active

054126363

ABSTRACT:
An apparatus for performing focusing control and tracking control for an objective lens of an optical head of an optical card reader and/or writer including first and second focusing error detecting systems for generating first and second focusing error signals, respectively, first and second tracking error detecting systems for generating first and second tracking error signals, respectively, a circuit for detecting a defect on an optical card to generate a defect signal, a selecting circuit for selecting one of the first and second focusing error signals and one of the first and second tracking error signals in accordance with the defect signal such that the selected error signals are free from the defect, a focusing actuator for moving the objective lens in the focusing direction in accordance with the selected focusing error signal, and a tracking actuator for moving the objective lens in the tracking direction in accordance with the selected tracking error signal.

REFERENCES:
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patent: 4631395 (1986-12-01), Ando
patent: 4719614 (1988-01-01), Leterme et al.
patent: 4730293 (1988-03-01), Pierce et al.
patent: 4787075 (1988-11-01), Matsuoka et al.
patent: 4907214 (1990-03-01), Nagano et al.
patent: 4918415 (1990-04-01), Hashimoto et al.
patent: 4926407 (1990-05-01), Yamamuro
patent: 5070491 (1991-12-01), Horie
patent: 5155718 (1992-10-01), Hashimoto et al.

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