Optical head device including fixed and movable deflection means

Details Optical head device including fixed and movable deflection means Optical head device including fixed and movable deflection means

1996-05-03

1998-07-07

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4422, 369 4432, 369 4437, G11B 708

Patent

active

057779600

ABSTRACT:
An optical head device supports an objective lens which faces an optical disc movable in a tracking direction. Light is caused to be emitted from a fixed optical system to be converged through the objective lens and to be incident on the optical disc. The light reflected by the optical disc is incident on the fixed optical system via the objective lens. The head also controls a position of the objective lens in the tracking direction using a tracking error detected by the fixed optical system. A movable deflection member deflects a bundle of rays incident thereon in the tracking direction from the fixed optical system in a direction perpendicular to a focusing direction and also to the tracking direction. A fixed deflection member deflects the bundle of rays incident thereon from the movable deflection member in the focusing direction and causes the bundle of rays to be incident on the optical disc via the objective lens. A co-moving mechanism causes the movable deflection member to move integrally with the objective lens.

REFERENCES:
patent: 5140572 (1992-08-01), Kibune et al.
patent: 5465242 (1995-11-01), Terashima et al.

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