Optical pickup and optical disc apparatus including the same

Details Optical pickup and optical disc apparatus including the same Optical pickup and optical disc apparatus including the same

2007-09-21

2009-02-17

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112110

Reexamination Certificate

active

07492676

ABSTRACT:
An optical pickup for recording/reproducing information on/from an optical disc having recording layers, includes a light source; an objective lens for condensing an optical beam emitted from the light source on the recording layer; a photo-detector having a light-receiving section for receiving return light from the optical disc; an optical-path separating unit for separating the optical path of the return light reflected by the optical disc from the optical path of the optical beam emitted from the light source; and a masking member having a masking unit shielding part of a passing-through optical beam, in which the masking unit shields the central region of the optical beam to be incident in the light-receiving section among the optical beams reflected by the other recording layers or surfaces different from the recording layer recording/reproducing information so as not to admit the central region to the light-receiving section.

REFERENCES:
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patent: 5590110 (1996-12-01), Sato
patent: 5610895 (1997-03-01), Izumi et al.
patent: 6141302 (2000-10-01), Koyama et al.
patent: 6614742 (2003-09-01), Ueyanagi
patent: 6643247 (2003-11-01), Higashino
patent: 2005-63595 (2005-03-01), None
U.S. Appl. No. 11/859,165, filed Sep. 21, 2007, Okamoto, et al.
U.S. Appl. No. 11/874,464, filed Oct. 18, 2007, Okamoto.

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