Objective lens actuator assembly for an optical disk drive

Details Objective lens actuator assembly for an optical disk drive Objective lens actuator assembly for an optical disk drive

1997-01-16

1999-04-27

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, G11B 7095

Patent

active

058986510

ABSTRACT:
In an optical disk drive selectively operable with different kinds of optical disks, an objective lens actuator assembly includes a plurality of objective lenses each assigned to a particular kind of optical disk for converging a laser beam issuing from a light source onto the recording surface of the optical disk. A disk-like lens holder supports the objective lenses on a single circle thereon. A chassis supports the lens holder such that the holder is freely rotatable and freely movable back and forth along its axis of rotation. A focusing actuator is mounted on the chassis for causing the lens holder to move along the axis of rotation. A tracking actuator causes the lens holder to rotate for thereby positioning the lenses. The tracking actuator has a single tracking coil affixed to the circumferential edge of the lens holder, and a plurality of magnets each attracting or repulsing the coil when current is fed to the coil. The magnets adjoin the circumferential edge of the lens holder and are mounted on the chassis in association with the lenses.

REFERENCES:
patent: 5721723 (1998-02-01), Uchimaru et al.
patent: 5729510 (1998-03-01), Kasahara et al.
K. Nakamura, et al., "Development of Twin Lens Optical Pick-Up for DVD", Technical Report, the Institute of Television Engineers of Japan, 1995, vol. 46 (VIR95-46), pp. 53-60.
Nikkei Mechanical, "Switching VD/CD Lenses", Aug. 7, 1995, vol. 460, pp. 62-65.

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