Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-12-13
2005-12-13
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
06975576
ABSTRACT:
When a light source of a first wavelength is used, side beams are allowed to occur, whereas side beams are prevented from occurring when a light source of a second wavelength is used, thereby raising the light use efficiency of the second light source. A semiconductor laser device comprises a first light source for emitting a light beam of a first wavelength and a second light source for emitting a light beam of a second wavelength different from the first wavelength. The grading groove of a diffraction grating is so formed that the first-order diffraction efficiency is almost zero for the light beam from the first light source and the first-order diffraction light is emitted for the light beam from the second light source.
REFERENCES:
patent: 5243585 (1993-09-01), Hoshino et al.
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5513164 (1996-04-01), Tanaka et al.
patent: 5541909 (1996-07-01), Nakajima et al.
patent: 5570333 (1996-10-01), Katayama
patent: 5684762 (1997-11-01), Kubo
patent: 5687153 (1997-11-01), Komma et al.
patent: 5717674 (1998-02-01), Mori et al.
patent: 5757754 (1998-05-01), Yamamoto et al.
patent: 5825022 (1998-10-01), Takekoshi et al.
patent: 5923796 (1999-07-01), Feldman et al.
patent: 5986996 (1999-11-01), Kitamura et al.
patent: 6072579 (2000-06-01), Funato
patent: 6084843 (2000-07-01), Abe et al.
patent: 6094308 (2000-07-01), Katsuma
patent: 6115345 (2000-09-01), Kato et al.
patent: 6130872 (2000-10-01), Sugiura et al.
patent: 6181668 (2001-01-01), Kajiyama et al.
patent: 6211511 (2001-04-01), Shih et al.
patent: 6240053 (2001-05-01), Akiyama
patent: 6301216 (2001-10-01), Takahashi
patent: 6358764 (2002-03-01), Nemoto
patent: 6363038 (2002-03-01), Yanagawa
patent: 6366548 (2002-04-01), Ohyama
patent: 6385158 (2002-05-01), Takagi et al.
patent: 6404709 (2002-06-01), Kouno
patent: 6414930 (2002-07-01), Shiono et al.
patent: 6507009 (2003-01-01), Ohnishi et al.
patent: 6584060 (2003-06-01), Oohchida et al.
patent: 62-219341 (1987-09-01), None
patent: 4-93922 (1992-08-01), None
patent: 4-212730 (1992-08-01), None
patent: 9-128794 (1997-05-01), None
patent: 10-289468 (1998-10-01), None
patent: 11-39705 (1999-02-01), None
patent: 11-185282 (1999-07-01), None
patent: 2001-243651 (2001-09-01), None
Translation of JP 11-185282.
Office Action, dated Apr. 20, 2004 from the Japanese Patent Office for Patent Application No. 11-199464.
Technical Digest of the seventh Microoptics Conference, “Development of DVD Optical Pickup using TWIN-LD” M.Uchiyama et al, pp. 18-21, Jul. 14, 1999.
Technical Digest of the Seventh Microoptics Conference, “Development of 7.3mm Height DVD Optical Pickup Using TWIN-LD” T. Ebihara et al, pp. 6-9, Jul. 14, 1999.
Kabushiki Kaisha Toshiba
Pillsbury Winthrop Shaw & Pittman LLP
LandOfFree
Optical head device and disk drive system having first and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical head device and disk drive system having first and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head device and disk drive system having first and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3482589