Tight beam position controlling apparatus

Details Tight beam position controlling apparatus Tight beam position controlling apparatus

1984-09-20

1987-05-19

McElheny, Jr., Donald

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With servo positioning of transducer assembly over track...

Optical servo system

G11B 7095

Patent

active

046673156

ABSTRACT:
A light beam position controlling apparatus includes a linear motor for driving an optical head in the radial direction of an optical disk, a radial actuator built-in within said optical head and adapted to drive an objective lens for causing the light beam to be accurately positioned in the radial direction of the optical disk and to rotate a mirror for causing the light beam to be deflected in the radial direction of the optical disk, which can be improved in the compression factor of the servo performance, by providing a phase lag compensation circuit and a damping correction circuit for increasing the gain of the transfer function at the resonance frequency of both the linear motor and radial actuator.

REFERENCES:
patent: 4005260 (1977-01-01), Janssen
patent: 4286318 (1981-08-01), Immink et al.
patent: 4446545 (1984-05-01), Van Dijk
patent: 4488276 (1984-12-01), Tanaka et al.

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