Optical pickup apparatus and optical pickup method

Details Optical pickup apparatus and optical pickup method Optical pickup apparatus and optical pickup method

2004-09-09

2008-09-16

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120

Reexamination Certificate

active

07426169

ABSTRACT:
An optical pickup apparatus for reading/reproducing data on an optical recording medium, includes a plurality of laser diodes configured to emit laser light of different wavelengths respectively, a photodetection device configured to detect each laser light, a diffraction type-optical device configured to transmit each laser light from the plurality of laser diodes to the optical recording medium, and to diffract the light reflected from the optical recording medium to the photodetection device, and wherein the diffraction type-optical device includes a plurality of reflecting type-diffraction elements configured to reflect and diffract each laser light of a corresponding wavelength in the laser light from the plurality of light diodes, to the photodetection device so that the photodetection device can detect each laser light of the corresponding wavelength for monitoring each of the laser light, and a suppression setting device configured to set each of the plurality of reflecting type-diffraction elements to suppress laser light other than the laser light of the corresponding wavelength to the photodetection device.

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Jan. 28, 2004 official Communication and European Search Report.
U.S. Appl. No. 09/344,120, filed Jun. 24, 1999.
U.S. Appl. No. 09/494,549, filed Jan. 31, 2000.

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