Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1983-06-06
1986-07-29
Cardillo, Raymond F.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 46, 250202, G11B 7095, G11B 713
Patent
active
046034102
ABSTRACT:
A servo device for use with a system for reading out recorded information having at least two pickup elements which produce pickup signals comprising a resistance network including at least a resistance through which at least two of the pickup signals flow, and an error signal producing device for producing a tracking error signal and a focusing error signal in accordance with a voltage level developed at a terminal of the resistance, whereby eliminating the use of a plurality of amplifying circuits and adder circuits which are respectively connected to each of pickup elements, and enabling the production of more accurate error signals and reduction of the cost of the servo device.
REFERENCES:
patent: 3198949 (1965-08-01), Holdo
patent: 4467462 (1984-08-01), Shibata
Cardillo Raymond F.
Pioneer Electronic Corporation
Weinhardt Robert A.
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