Optical disk apparatus having auto-focusing servo systems for mu

Details Optical disk apparatus having auto-focusing servo systems for mu Optical disk apparatus having auto-focusing servo systems for mu

1989-02-28

1991-07-23

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, 369 4429, 369 4427, 369112, 369110, G11B 735, G11B 700, G11B 2110, G11B 709

Patent

active

050349414

ABSTRACT:
A recording/reproduction head incorporates an optical system which produces two light spots on an optical disk at positions spaced out from each other by, for example, half the radial span of the effective area of the disk. In recording or reproducing information using the two light spots, the inner light spot is moved to an unused track area provided in the innermost section of the disk, an auto-focusing servo system for the inner light spot is started, a control track provided near the unused area is read to judge the compatibility of the disk, and, only when the disk compatibility is verified, the outer light spot is moved to an unused track area provided in the outermost section of the disk, and an auto-focusing servo system for the outer light spot is started by making reference to a signal to the already operating inner auto-focusing servo system. Although the outer auto-focusing servo system is started at the outermost section where the vertical swing of the disk is pronounced, the disk swing can be inferred from the signal of the already operating inner auto-focusing servo system, and therefore it can be started stably even over the outer section with a large vertical swing at a timing of minimal swing imparted by the signal of the inner auto-focusing servo system.

REFERENCES:
patent: 4841502 (1989-06-01), Murakami et al.

Affiliated with

Also associated with

Rating

Optical disk apparatus having auto-focusing servo systems for mu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical disk apparatus having auto-focusing servo systems for mu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical disk apparatus having auto-focusing servo systems for mu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-438083