Laser beam emitting device and an optical pickup provided with t

Details Laser beam emitting device and an optical pickup provided with t Laser beam emitting device and an optical pickup provided with t

1998-05-29

2000-10-17

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, G11B 700

Patent

active

061342106

ABSTRACT:
A laser beam emitting device has a laser beam source for emitting a laser beam having a prescribed effective optical path region; and a light-receiving element positioned outside the effective optical path region of the laser beam emitted by the laser beam source and having a plurality of light-receiving regions for detecting intensity of the emitted laser beam. In this device, the output of the laser beam source is adjusted in response to the intensity of the emitted laser beam detected by at least one of the plurality of the light-receiving regions of the light-receiving element. The light-receiving element includes a first light-receiving region located at a position near the optical axis and a second light-receiving region located at a position farther from the optical axis than the position of the first light-receiving region. The arrangement of the first and second light-receiving regions can provide at least three sensitivity levels by selecting one of electrical current values outputted from the plurality of light-receiving regions or any combination of these electrical current values. The laser beam emitting device is provided in an optical pickup for use in an optical disc drive such as CD-R drive.

REFERENCES:
patent: 4721850 (1988-01-01), Sakai et al.
patent: 5539718 (1996-07-01), Hoshi et al.
patent: 5563870 (1996-10-01), Silverstein
Patent Abstracts of Japan: Application No.: 03276432, vol. 016, No. 100, Mar. 11, 1992.
Patent Abstracts of Japan: Application No.: 05081695, vol. 017, No. 422, Aug. 5, 1993.

Affiliated with

Also associated with

Rating

Laser beam emitting device and an optical pickup provided with t does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laser beam emitting device and an optical pickup provided with t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser beam emitting device and an optical pickup provided with t will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-476231