Optical pickup device

Details Optical pickup device Optical pickup device

2005-08-11

2008-09-02

Patel, Gautam R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07420894

ABSTRACT:
Provided is an optical pickup device whose optical axis adjustment can be performed while an increase in cost is suppressed and whose optical axis correction can be accurately performed even when a variation in arrangement between laser elements occurs. The optical pickup device includes a semiconductor101that houses at least three laser elements having at least three different emission wavelengths in a single package, and first and second diffraction gratings102and111for substantially matching optical axes of lasers emitted from the laser elements with the optical axis of the reference laser beam by a diffraction effect. The first diffraction grating102matches an optical axis of a laser beam for CD (780 nm in wavelength) with the reference optical axis by a diffraction effect. The second diffraction grating111matches an optical axis of a laser beam for DVD (655 nm in wavelength) with the reference optical axis by a diffraction effect. Even when a variation occurs in a light emitting point gap between the laser elements, by performing fine adjustment of the corresponding diffraction grating in the reference optical axis direction, the optical axis of the laser beam can be adjusted.

REFERENCES:
patent: 5283690 (1994-02-01), Miyake et al.
patent: 06-131688 (1994-05-01), None
patent: 2895150 (1999-03-01), None
patent: 11-134702 (1999-05-01), None
patent: 11134702 (1999-05-01), None
patent: 2003-149443 (2003-05-01), None
Korean Office Action, issued in corresponding Korean Patent Application No. 10-2005-0079198, dated on Mar. 27, 2007.

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