Laser beam control circuit for optical recording/reproducing app

Details Laser beam control circuit for optical recording/reproducing app Laser beam control circuit for optical recording/reproducing app

1990-01-31

1991-08-13

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, 369121, 369122, 369 54, 250205, G11B 1112, G11B 7125

Patent

active

050401637

ABSTRACT:
A laser beam control circuit for an optical recording/reproducing apparatus, which controls the intensity of a laser beam striking a magneto-optical disc. The control circuit controls the injection current to a laser diode to provide high intensity for recording and low intensity for reproducing, providing a smooth transition between the high and low intensity states, and avoiding any excessive transition current. The control circuit monitors the output power of the laser diode and maintains it at a first value in the reproducing mode and a second value in the recording mode, and further controls the output power so that even during switching, the output power does not exceed the second level. This is done by supplying a compensating reference voltage to the recording power control loop during the reproducing mode, so that the output of the recording error amplifier does not change abruptly when the operating mode is switched to the recording mode.

REFERENCES:
patent: 4845720 (1989-06-01), Koishi et al.

Affiliated with

Also associated with

Rating

Laser beam control circuit for optical recording/reproducing app 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 control circuit for optical recording/reproducing app, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser beam control circuit for optical recording/reproducing app will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1532473