Optical pickup apparatus having optical detection area for...

Details Optical pickup apparatus having optical detection area for... Optical pickup apparatus having optical detection area for...

2007-11-20

2007-11-20

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370, C369S044290

Reexamination Certificate

active

10896618

ABSTRACT:
The optical pickup apparatus includes a light emitting means, an optical means, and an optical detection means. The light emitting means emits a single beam. The optical means diffracts the single beam, focuses the optical spot of the diffracted beam on a track, and transmits the diffracted beam to an outside. The optical detection means includes a first optical detection unit on which a central beam having a 0-order diffraction coefficient is focused, and second and third optical detection units on which side beams having ±1 diffraction coefficients are focused, respectively. Each optical detection unit is segmented into a specific number of optical detection areas, and at least one of the optical detection units is provided with an optical detection area on which a tracking error signal used to compensate for tracking offset attributable to optical axis offset of an objective lens is not formed.

REFERENCES:
patent: 5815473 (1998-09-01), Takahashi et al.
patent: 5892744 (1999-04-01), Ohba
patent: 6222803 (2001-04-01), Uemura et al.
patent: 7116612 (2006-10-01), Ogasawara et al.
patent: 7215609 (2007-05-01), Shimano et al.
patent: 2001-98602 (2001-08-01), None

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