Optical scanning device

Details Optical scanning device Optical scanning device

2006-05-23

2006-05-23

Young, W. R. (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112100

Reexamination Certificate

active

07050364

ABSTRACT:
An optical pickup unit for scanning an optical disk includes a first optical branch including a first radiation source for emitting a first radiation beam of a first wavelength, and a dichroic mirror (8) located in the path of the first radiation beam for reflecting the first beam towards the disk, and a second optical branch including a second radiation source for emitting a second radiation beam of a second wavelength, different to said first wavelength, and a folding mirror (28) located in the path of the second radiation beam for reflecting the second beam towards the disk. The first and second branches are stacked in the axial direction of the disk, and are arranged substantially perpendicularly when viewed along the axial direction.

REFERENCES:
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patent: 6069862 (2000-05-01), Fujita et al.
patent: 6243337 (2001-06-01), Miyanabe et al.
patent: 6275461 (2001-08-01), Yoo et al.
patent: 6370103 (2002-04-01), Yamazaki et al.
patent: 6650613 (2003-11-01), Jutte et al.
Patent Abstracts of Japan, Fukui Yukio: “Optical Pickup And Optical Disk Device” Publication No. 10222865, Aug. 21, 1998, Application No. 09024785, Feb. 7, 1997.

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