Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1983-01-24
1986-05-13
Richardson, Robert L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
G11B 700
Patent
active
045891036
ABSTRACT:
A grooveless record having parallel tracks on which information is recorded as a series of microscopic pits is illuminated with a laser which reflects off to a pair of first and second adjoining optoelectrical sensing elements (7a, 7b) to generate respective output signals so that the sensing elements are equally illuminated when the laser beam is kept at a predetermined angle of incidence on the path of the record track. To compensate for tracking errors resulting from the tilting of the record, there is derived from the sensing elements a pair of first and second peak value signals each bearing exclusively the information on the tilt angle. The output signals from the first and second sensing elements are modulated in magnitude with the first and second peak value signals by multiplier circuits (30, 31; 40, 41) and fed to a subtractor (37; 70) for detecting the difference between the two modulated signals to generate a tracking control signal so that the error information is nullified at the output of the subtractor.
REFERENCES:
patent: 4365324 (1982-12-01), Michaelis
patent: 4408314 (1983-10-01), Yokota
patent: 4467462 (1984-08-01), Shibata
Patent Abstracts of Japan, vol. 7, No. 6 (P-167)(1151), Jan. 11, 1983; & JP-A-57 164447 (Matsushita Denki Sangyo K.K.) 09-10-1982.
Patent Abstracts of Japan, vol. 7, No. 6 (P-167)(1151), Jan. 11, 1983; & JP-A-57 164448 (Matsushita Denki Sangyo K.K.) 09-10-1982.
Video Disk and Digital Audio Disk for Beginners, Japanese Publication.
Sheng; Theoretical Considerations of Optical Diffraction from RCA Video Disc Signals; RCA Review; vol. 39, Sept. 1978, pp. 512-555.
Richardson Robert L.
Victor Company of Japan , Limited
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