Optical pickup

Details Optical pickup Optical pickup

2006-03-28

2006-03-28

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112050, C369S112170, C250S216000, C250S201500

Reexamination Certificate

active

07020063

ABSTRACT:
An optical pickup comprising: a diffraction grating, a beam splitter and laser beam guiding optical components that change direction of laser beams, which are placed on a light path constituted by a semiconductor laser that emits dual wavelength laser beams and an information recording surface of an optical disk, wherein a wavelength plate is provided on a light path between said diffraction grating and said semiconductor laser so that a laser beam irradiated on the recording surface of said optical disk becomes an elliptically polarized (including circularly polarized) beam or a beam having a polarizing plane that produces an angle of 30–60 degrees relative to a radius direction.

REFERENCES:
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 6034797 (2000-03-01), Ju et al.
patent: 6072579 (2000-06-01), Funato
patent: 6195315 (2001-02-01), Takahashi et al.
patent: 6240053 (2001-05-01), Akiyama
patent: 6366548 (2002-04-01), Ohyama
patent: 6876621 (2005-04-01), Ohuchida et al.
patent: 2001-344804 (2001-12-01), None
patent: 2002-092925 (2002-03-01), None
Patent Abstracts of Japan for JP2001-344804 published Dec. 14, 2001.
Patent Abstracts of Japan for JP2002-092925 published Mar. 29, 2002.

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