Waveguide integrated optical pickup device and optical waveguide

Details Waveguide integrated optical pickup device and optical waveguide Waveguide integrated optical pickup device and optical waveguide

1996-10-30

1998-07-14

Lee, John D.

Optical waveguides

With optical coupler

Input/output coupler

369 4423, 385 14, 385129, G02B 634

Patent

active

057816760

ABSTRACT:
According to the present invention, an optical pickup device includes: a light source for generating a light beam; an objective lens for converging the light beam onto a recording medium; a beam splitter for splitting the light beam reflected from the recording medium into two light beams; an optical waveguide element for detecting an information signal in accordance with one of the two converged light beams; and an optical element, disposed between the beam splitter and the optical waveguide element, for providing the one of the two converged light beams with astigmatism. The optical waveguide element includes a prism coupler, a waveguide layer, and a photodetecting portion. The optical waveguide element an the optical element are arranged to locate a first focal line of the one of the two converged light beams within a plane of the waveguide layer, to locate a first focal point at an edge of the prism coupler, and to locate a second focal point on the photodetecting portion.

REFERENCES:
patent: 4731527 (1988-03-01), Nomura et al.
patent: 4767921 (1988-08-01), Kawasaki et al.
patent: 4973836 (1990-11-01), Matsuoka
patent: 5146080 (1992-09-01), Opheij
patent: 5189651 (1993-02-01), Utsumi
patent: 5235589 (1993-08-01), Yokomori et al.
patent: 5511050 (1996-04-01), Matsumoto et al.

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