Videodisc focusing and tracking servo

Details Videodisc focusing and tracking servo Videodisc focusing and tracking servo

1987-11-06

1988-09-20

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 350235, 250201, 250202, G11B 7095

Patent

active

047730552

ABSTRACT:
An electro-optical apparatus comprising an objective (7) scans an optical disc (3) having a transparent protective layer (5) by means of a radiation beam (10) which, through the transparent layer, is focussed on a reflecting recording surface (4). The objective moves along the optical axis (19) for focussing the radiation beam on the recording layer and moreover performs limited pivotal movements. The position of the optical axis of the objective is corrected for obliquity of the surface of the optical disc, correction means (22A, B) being provided to tilt the objective through a correction angle, so that the angle between the optical axis and the normal to the disc surface is reduced.

REFERENCES:
patent: 3915560 (1975-10-01), Levine
patent: 3974327 (1976-08-01), Dijk
patent: 4003059 (1977-01-01), Sugiura
patent: 4021101 (1977-05-01), Comerik
patent: 4135083 (1979-01-01), Alem
patent: 4135206 (1979-01-01), Kleuters
patent: 4374324 (1983-02-01), van Rosmalen
patent: 4453241 (1984-06-01), Verdonk
"Video Disk Player optics", by Bouwhuis, Applied Optics, Jul. 1978, vol. 17, No. 13, pp. 1993-1999.

Affiliated with

Also associated with

Rating

Videodisc focusing and tracking servo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Videodisc focusing and tracking servo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Videodisc focusing and tracking servo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1753419