Focus detection system for an optical disk drive using photo sen

Details Focus detection system for an optical disk drive using photo sen Focus detection system for an optical disk drive using photo sen

1988-11-14

1991-03-05

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

049982354

ABSTRACT:
An apparatus is described for reading/writing an optical recording carrier, which have information pits aligned in a track. In order to get a focus error signal, the apparatus has two pairs of photo sensor elements, two phase detection circuits for the two pairs of photo sensor elements, and an adder circuit for adding outputs of the two phase detection circuits. The elements are placed symmetrically about an optical axis in a far field area of the pits.

REFERENCES:
patent: 4006293 (1977-02-01), Bouwhuis et al.
patent: 4025784 (1977-05-01), Lehureau et al.
patent: 4051527 (1977-09-01), Braat
patent: 4097730 (1978-06-01), Korpel
patent: 4243848 (1981-01-01), Utsumi
patent: 4819220 (1989-04-01), Miyazaki et al.
patent: 4888757 (1989-12-01), Fujita
Patent Abstracts of Japan, vol. 7, No. 32, (p.-174)(1177), Feb. 8, 1983; JP-A-57-183639, (Hitachi Seisakusho K.K.), Nov. 12, 1982.

Affiliated with

Also associated with

Rating

Focus detection system for an optical disk drive using photo sen does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus detection system for an optical disk drive using photo sen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detection system for an optical disk drive using photo sen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-501731