Optical pickup apparatus having an improved holographic...

Details Optical pickup apparatus having an improved holographic... Optical pickup apparatus having an improved holographic...

2005-08-30

2005-08-30

Ometz, David L. (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112100, C369S112040, C369S112050

Reexamination Certificate

active

06937554

ABSTRACT:
In an optical pickup apparatus of the present invention, either a first laser diode emits a laser beam having a first wavelength or a second laser diode emits a laser beam having a second wavelength. An optical system focuses one of the two laser beams onto a recording surface of an optical recording medium. A photodetector unit receives reflection beams, which are reflected from the recording medium, to generate detection signals from the received reflection beams. A holographic unit has a first hologram suited to the first laser diode and a second hologram suited to the second laser diode, the first hologram provided to diffract a reflection beam of the laser beam of the first laser diode to the photodetector unit, and the second hologram provided to diffract a reflection beam of the laser beam of the second laser diode to the photodetector unit.

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patent: 2001/0026523 (2001-10-01), Ohuchida et al.
patent: 2002/0024916 (2002-02-01), Ueyama et al.
patent: 2000076689 (2000-03-01), None

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