Diffraction device for reading and/or writing a record carrier

Details Diffraction device for reading and/or writing a record carrier Diffraction device for reading and/or writing a record carrier

2006-07-18

2006-07-18

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

C369S112020

Reexamination Certificate

active

07079470

ABSTRACT:
A device for reading and/or writing a record carrier (13), the device comprising converging means (35, 45, 47, 106, 108) for focusing a radiation beam (27, 101) originating from a radiation source (25) on the record carrier (13). The converging means comprises polarization means (103) and a diffraction grating (107) of birefringent material. Dependent on the direction of polarization, the radiation beam (101) is focused on one of two possible surfaces corresponding to DVD and DVR, respectively. A diffraction grating (107) is present in a central area of the radiation beam (101) and causes diffraction of a first order for one direction of polarization of the radiation beam (101) and diffraction of a second, higher, order for a second direction of polarization of the radiation beam (101). The diffraction grating (107) is made of birefringent material.

REFERENCES:
patent: 5594818 (1997-01-01), Murphy
patent: 5745465 (1998-04-01), Tsai et al.
patent: 5787061 (1998-07-01), Tsuchiya et al.
patent: 5815293 (1998-09-01), Komma et al.
patent: 6052353 (2000-04-01), Fujita
patent: 6301047 (2001-10-01), Hoshino et al.
patent: 6366548 (2002-04-01), Ohyama
patent: 6385158 (2002-05-01), Takagi et al.
patent: 6449095 (2002-09-01), Ohtaki et al.
patent: 6567355 (2003-05-01), Izumi et al.
patent: 6577376 (2003-06-01), Shih
patent: 6580674 (2003-06-01), Nishiyama et al.
patent: 6618116 (2003-09-01), Murata et al.
patent: 6707779 (2004-03-01), Stallinga
patent: 10083560 (1998-03-01), None
Trnslation of JP 10-083560 provided by JPO website.
Patent Abstracts of Japan, vol. 1998, No. 08, Jun. 30, 1998, JP10083560A.

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