Optical head, optical recording and/or reproducing apparatus...

Details Optical head, optical recording and/or reproducing apparatus... Optical head, optical recording and/or reproducing apparatus...

2005-06-14

2005-06-14

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

06906991

ABSTRACT:
An optical head includes a light emitter/detector to emit a laser light towards an optical disc and to detect a return light from the optical disc, a diffraction grating to split the laser light into three beams, and a light converging optical system to focus the laser light on a recording surface of the optical disc. The diffraction grating has formed therein a plurality of slits formed whose depth is selected so that the efficiency of diffraction of first-order light when a first light beam is incident upon the diffraction grating is higher than that when a second light beam having a longer wavelength than the first light beam is incident upon the diffraction grating.

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patent: 5717674 (1998-02-01), Mori et al.
patent: 6091691 (2000-07-01), Yoo et al.
patent: 6181668 (2001-01-01), Kajiyama et al.
patent: 0 860 819 (1998-08-01), None
patent: 0 932 145 (1999-07-01), None
patent: 1 001 413 (2000-05-01), None
patent: WO 98 13826 (1998-04-01), None

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