Semiconductor laser apparatus and optical pickup apparatus using

Details Semiconductor laser apparatus and optical pickup apparatus using Semiconductor laser apparatus and optical pickup apparatus using

1997-03-03

1998-03-10

Bovernick, Rodney B.

Coherent light generators

Particular active media

Semiconductor

369 4414, 369103, 359 13, 359 15, 372 50, G11B 713, H01S 319

Patent

active

057270090

ABSTRACT:
In an optical pickup apparatus, a laser beam emitted from a semiconductor laser device is reflected upward by a reflecting member, transmitted through a transmission type diffraction grating and split into at least three beams, and which beams are transmitted through a transmission type holographic optical element and condensed onto an optical recording medium by a condenser portion. A return beam reflected by the optical recording medium passes through the condenser portion and diffracted not to impinge upon the transmission type diffraction grating by the holographic optical element and directed to a photodetector portion of a light receiving device. The semiconductor laser device and the light receiving device are disposed in a mount member. The transmission type holographic optical element is supported by a supporting member three-dimensionally movably with respect to the mount member, and the supporting member or/and the holographic optical element is/are fixed with adhesive material with the transmission type holographic optical element being positioned with respect to the mount member.

REFERENCES:
patent: 4731772 (1988-03-01), Lee
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patent: 5018804 (1991-05-01), Lee
patent: 5136152 (1992-08-01), Lee
patent: 5285062 (1994-02-01), Lee
patent: 5293038 (1994-03-01), Kadowaki et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5481524 (1996-01-01), Ueno et al.
Lee et al, Optical Pickup for Compact Disc Player Using Computer-Generated Hologram and Reflection-Type Grating, Samsung Advanced Institute of Technology; Sep. 18, 1993, pp. 5451-5452.
Lee, Holographic Optical Head for Compact Disk Application, Optical Engineering; Jun. 1989, pp. 650-653.

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