Laser emission unit, optical head and optical memory device

Details Laser emission unit, optical head and optical memory device Laser emission unit, optical head and optical memory device

1993-11-16

1996-12-03

Nguyen, Viet Q.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4412, 369 4415, 369 4423, 369 4437, 369121, 369112, G11B 700, G11B 712

Patent

active

055815235

ABSTRACT:
A laser emission unit for use in an optical head performs a plurality of functions which are integrated. A laser beam from the laser emission unit mounted in a lens holder is emitted through an objective lens and is focused on an optical medium. A reflected beam from the optical medium returns through the objective lens and a diffraction grating to a signal detection circuit in the laser emission unit. Since the laser emission unit performs a plurality of functions, the space for various elements otherwise required in the optical head can be eliminated. The space for an additional light path for the reflected beam is also eliminated. Therefore, the size of the optical head is very small. Since the optical head can be assembled by using a small number of parts, the production costs can be reduced. Furthermore, the optical head can shield the noises by using the housing and/or the lens holder itself.

REFERENCES:
patent: 5157649 (1992-10-01), Suzuki
patent: 5168485 (1992-12-01), Lehureau et al.
patent: 5293367 (1994-03-01), Kadowaki et al.
patent: 5360970 (1994-11-01), Kay
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5374819 (1994-12-01), Kim et al.
IEEE GaAs IC Symposium, Technical Digest 1988, Nashville, Tennessee, Nov. 6-9, 1988, pp. 151-154, Kobayashi et al., "A High Frequency GaAs Multivibrator IC".

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