Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-10-10
2006-10-10
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S110030, C369S112190
Reexamination Certificate
active
07120107
ABSTRACT:
An optical head is provided, which suppresses the offset in the tracking error signal. This head comprises (a) a light source for emitting a light beam to be irradiated to an optical recording medium as an incident light beam; (b) a hologram element for receiving a reflected light beam generated by reflection of the incident light beam on the medium to generate at least two diffracted light beams for focusing error detection and at least two diffracted light beams for tracking error detection; and (c) an optical detector for detecting the at lease two diffracted light beams for focusing error detection and the at least two diffracted light beams for tracking error detection; the detector including a first receiving surface for receiving the at least two diffracted light beams for focusing error detection and a second detection surface for receiving the at least two diffracted light beams for tracking error detection; each of the first and second receiving surfaces being divided into receiving regions; the at least two diffracted light beams for focusing error detection being received at the receiving regions of the first receiving surface; the at least two diffracted light beams for tracking error detection being received at the receiving regions of the second receiving surface.
REFERENCES:
patent: 4908506 (1990-03-01), Coops et al.
patent: 4924079 (1990-05-01), Opheij et al.
patent: 5122903 (1992-06-01), Aoyama et al.
patent: 5144131 (1992-09-01), Opheij et al.
patent: 5374819 (1994-12-01), Kim et al.
patent: 5391865 (1995-02-01), Kurata et al.
patent: 5570333 (1996-10-01), Katayama
patent: 5623462 (1997-04-01), Tezuka et al.
patent: 5659531 (1997-08-01), Ono et al.
patent: 5687155 (1997-11-01), Fukakusa et al.
patent: 5875167 (1999-02-01), Katayama
patent: 5905750 (1999-05-01), Lebby et al.
patent: 5946137 (1999-08-01), Momoo et al.
patent: 5953304 (1999-09-01), Dang et al.
patent: 5953355 (1999-09-01), Kiely et al.
patent: 5956302 (1999-09-01), Maeda et al.
patent: 6125087 (2000-09-01), Ohnishi et al.
patent: 6272097 (2001-08-01), Nakao et al.
patent: 6369377 (2002-04-01), Shih et al.
patent: 6418098 (2002-07-01), Yamamoto et al.
patent: 6445671 (2002-09-01), Takeda et al.
patent: 2003/0039034 (2003-02-01), Hatano et al.
patent: 62-172538 (1987-07-01), None
patent: 62-277640 (1987-12-01), None
patent: 7-9708 (1995-02-01), None
patent: 8-287499 (1996-11-01), None
patent: 9-44921 (1997-02-01), None
patent: 10-208284 (1998-08-01), None
patent: 10-255318 (1998-09-01), None
patent: 10269588 (1998-10-01), None
patent: 11-25465 (1999-01-01), None
patent: 11-45451 (1999-02-01), None
Kamiya Akihiro
Satoh Masahiko
Takahashi Jun-ichi
Battaglia Michael V.
Muirhead & Saturnelli LLC
NEC Corporation
Tran Thang V.
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