Optical pickup employing a vertical cavity surface-emitting lase

Details Optical pickup employing a vertical cavity surface-emitting lase Optical pickup employing a vertical cavity surface-emitting lase

1996-06-26

1999-02-23

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250551, 250225, 369121, H01J 4014

Patent

active

058747303

ABSTRACT:
An optical pickup is provided which detects information contained in an optical disk. The optical disk includes a light source, a hologram device, an objective lens, a photodetector, and a single chip. The light source is formed of a first vertical cavity surface-emitting laser (VCSEL) diode and emits a light beam. The hologram device converts the light beam emitted from said light source into a polarized parallel light beam and diffracts a reflected parallel light beam reflected from said optical disk to produce a diffracted beam. The objective lens focuses the polarized parallel light beam on said optical disk and converts a corresponding reflected beam into the parallel reflected beam. The photodetector is formed of a second VCSEL diode and detects various characteristics of the diffracted beam. Finally, the light source and the photodetector are integrated on the chip. As a result of the configuration above, the light source emits a laser beam which has a small astigmatism and does not lose its intensity as it propagates through the optical head.

REFERENCES:
patent: 5285466 (1994-02-01), Tabatabaie
patent: 5331621 (1994-07-01), Miyake et al.
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5483511 (1996-01-01), Jewell et al.
patent: 5561683 (1996-10-01), Kwon
Patent Abstracts of Japan, vol. 095, No. 010, Nov. 30, 1995, & JP 07 0192291 A (Matsushita Electric Ind Co Ltd), Jul. 28, 1995 *Abstract.

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