Focus servo device for use in an optical information read-out de

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

369 46, 369112, G11B 712

Patent

active

042901324

ABSTRACT:
In a focus servo apparatus for an optical type information read-out system having a light source, a condenser lens for focusing light from the light source on a recording surface of a recording medium and for focusing light reflected by the surface and containing the information recorded on the surface, a cylindrical lens for passing the reflected light, a light receiving element responsive to the reflected light from the cylindrical lens for providing an output and a driving device responsive to the output for regulating the position of the condenser lens relative to the surface, the cylindrical lens has its main, or primary, principal point substantially at the focusing point of the condenser lens for the reflected light and the physical axis of the cylindrical lens makes an angle of about 45.degree. with respect to the moving direction of the recording medium.

REFERENCES:
patent: 3359056 (1967-12-01), Offner
patent: 4011400 (1977-03-01), Simons et al.
patent: 4025949 (1977-05-01), Whitman
patent: 4037929 (1977-07-01), Bricot et al.
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4128847 (1978-12-01), Roullet et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Focus servo device for use in an optical information read-out de 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 servo device for use in an optical information read-out de, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus servo device for use in an optical information read-out de will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-393863

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.