Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-07-19
2005-07-19
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112230
Reexamination Certificate
active
06920102
ABSTRACT:
An optical head reproduces optical disks of different disk plate thickness t1(0.6 mm) or t2(1.2 mm) by using light beams of two wavelengths and one object lens. An converging element comprises a central portion and outer portion, wherein the central portion has optimum design plate thickness of 0.6*t1to t1and the outer portion has optimum design plate thickness of 0.6 mm. By providing a step difference in the converging element, information can be recorded or reproduced for an information medium of disk plate thickness t1and for an information medium of disk plate thickness t2, in a state having small side lobes. Alternatively, a step difference is provided in the object lens, and optical distance L2from a second light source to a condensing optical system is set to 80 to 95% of optical distance L1from a first light source to the condensing optical system. Alternatively, only light of first wavelength is shielded or diffracted in a ring-like shape.
REFERENCES:
patent: 5822135 (1998-10-01), Lee et al.
patent: 5883873 (1999-03-01), Morita
patent: 5889748 (1999-03-01), Shimano et al.
patent: 5978346 (1999-11-01), Mizuno et al.
patent: 6400670 (2002-06-01), Dang
patent: 0 818 781 (1998-01-01), None
patent: 0 838 812 (1998-04-01), None
patent: 0 859 356 (1998-08-01), None
patent: 0 865 037 (1998-09-01), None
patent: 7-065407 (1995-03-01), None
patent: 10-026726 (1998-01-01), None
patent: 10-124912 (1998-05-01), None
patent: 10-214431 (1998-08-01), None
patent: 10-275355 (1998-10-01), None
patent: 11-002759 (1999-01-01), None
Anzai Jouji
Hayashi Hideki
Kamei Tomotada
Mizuno Sadao
Yamamoto Hiroaki
Hindi Nabil
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Converging element, optical head, and apparatus and method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Converging element, optical head, and apparatus and method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Converging element, optical head, and apparatus and method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3415725