Optical pickup

Details Optical pickup Optical pickup

2011-05-24

2011-05-24

Renner, Craig A. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S103000, C369S112030, C369S112100, C369S112140, C369S112150, C369S112160, C369S112210, C369S112270, C369S112290

Reexamination Certificate

active

07948855

ABSTRACT:
A multiple wavelength-adaptive optical pickup according to the present invention enables to obtain stable signals by suppressing displacement of optical intensity distribution at a light receiving section. When an incident angle of a central beam of a zero-dimensional beam of a beam reflected at an optical disc into a half mirror is taken as θ, if variation in transmittance of the mirror become a maximum with respect to change in the incident angle from θ to a plus side in any one of the wavelengths corresponding to the respective optical discs, a −1 dimensional beam generated on the minus side with respect to the zero-dimensional beam is received by the light receiving section, and if the variation in the transmittance of the mirror become the maximum with respect to change in the incident angle from θ to the minus side, a +1 dimensional beam generated on the plus side with respect to the zero-dimensional beam is received by the light receiving section. These received one-dimensional beams are used for detection of signals for servo control.

REFERENCES:
patent: 5883741 (1999-03-01), Ono et al.
patent: 7180846 (2007-02-01), Kim et al.
patent: 7542397 (2009-06-01), Ogasawara et al.
patent: 2001/0036137 (2001-11-01), Katayama
patent: 2003/0043724 (2003-03-01), Kim
patent: 2004/0218502 (2004-11-01), Kim et al.
patent: 2005/0122881 (2005-06-01), Aiki
patent: 2004-103135 (2004-04-01), None
patent: 2004-139709 (2004-05-01), None
Patent Abstracts of Japan for Japanese Publication No. 2004-103135, Publication date Apr. 2, 2004 (1 page).

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