Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1984-11-05
1987-04-14
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
250201, 369 46, 369112, G11B 700
Patent
active
046583890
ABSTRACT:
A radially acting track follower system with an optical scanner for an audio or video record disc playback apparatus is provided. The apparatus generates three light spots disposed approximately on a straight line with an adjustable phase grate. The position of the light spots can be adjusted relative to the tangent of the track scanned. The central main luminous spot provides the track scanning wit respect to the information content of the track and possibly with respect to the generation of a focussing adjustment signal. The two outer or auxiliary luminous spots provide for a radial adjustment control. They are displaced in the direction of the track at an equal distance from the main light spot in a radially opposite direction to each other by equal amounts. Their light intensity is captured by detectors, and is processed to control signals which are fed to the drive converters for each of the reflection mirror parts, which are subdivided into three part sections and which are tiltably or shiftably supported. The converters can be based on electromechanical principles and are preferably piezoelectric converters. A control signal of, for example, 10 Kilohertz is superposed to the control signal for the converter of the outer part mirror sections and thus improves the scanning and guide following properties without the disadvantage of the superposition of the scanned information containing signal with the control signal.
REFERENCES:
patent: 3799644 (1974-03-01), Street
patent: 3974327 (1976-08-01), Van Dijk
patent: 4462095 (1984-07-01), Chen
patent: 4527263 (1985-07-01), Nakagawa
"Adaptive Optics with Segmented Mirror or Deformable Mirror", Gaffard et al, Journal de Physique, Nov. 1980, p. C9-269-73.
Deutsche Thomson Brandt GmbH
Kasper Horst M.
Psitos Aristotelis M.
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