Optical pickup device

Details Optical pickup device Optical pickup device

1998-03-05

2000-02-29

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

359641, 369112, G02B 2710, G02B 2730, G11B 700

Patent

active

060316675

ABSTRACT:
Disclosed is an optical pickup device which comprises a beam emitting system for supplying at least two independent light beams, a common light converging optical system for converging the light beams from the beam emitting system toward a recording medium, a first optical element for reflecting one of the light beams from the beam emitting system so as to guide the reflected light beam to the light converging optical system and for transmitting returning light beams from the recording medium therethrough without causing substantial aberration, a second optical element for causing astigmatic aberration to the returned light beams which pass through the first optical element, while transmitting the returning light beams therethrough, and a light receiving system for receiving the returning light beams which have passed through the second optical element.

REFERENCES:
patent: 5151889 (1992-09-01), Saimi et al.
Japanese Patent Application No. 5-328230 filed Dec. 24, 1993, Kokai No. 7-98431, Apr. 11, 1995, Matsusita Electric Industrial Co., Ltd.

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