Optical pick-up device with a polarized light beam converter

Details Optical pick-up device with a polarized light beam converter Optical pick-up device with a polarized light beam converter

2007-10-02

2007-10-02

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S490020

Reexamination Certificate

active

10822180

ABSTRACT:
An optical pick-up device includes a light source (2), a polarized light beam converter (4), a splitter (6), a collimating lens (7), and a photo-detector (9). A linear polarized light beam with a first type of polarized component and a second type of polarized component is emitted from the light source, and passes through the polarized light beam converter. The first type of polarized component is converted into the second type of polarized component by the polarized light beam converter. Then part of the light beam with the second type of polarized component passes through the splitter and is focused onto an optical disc (8) by the collimating lens. The optical disc reflects the light beam that contains recorded information read from the optical disc. The reflected light beam passes back through the collimating lens, is reflected by the splitter, and is received by the photo-detector.

REFERENCES:
patent: 5657306 (1997-08-01), Komatsu
patent: 5708644 (1998-01-01), Hasegawa
patent: 5748602 (1998-05-01), Chao et al.
patent: 6348997 (2002-02-01), Itoh
patent: 6542298 (2003-04-01), Aoki
patent: 1182933 (1998-05-01), None

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