Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1985-03-18
1987-06-09
McElheny, Jr., Donald
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
358338, G11B 1924
Patent
active
046725954
ABSTRACT:
A system for controlling the rotary drive of a disk player employing only inexpensive and simple circuits. A position pulse signal is generated of a frequency proportional to the radial distance of the pickup from a reference position, and a rotation pulse signal is produced having a frequency proportional to the speed of the motor. When the rotational pulse signal is generated, the pulses thereof are counted, and when the counted pulse number falls outside a predetermined range, a switch signal is produced in an active state. When the switch signal is in its inactive state, a first control signal, which is based on the signal output of the pickup, is supplied to a motor drive circuit, and when the switch signal is in the active state, a second control signal, based both on both the rotation pulse signal and the position pulse signal, is supplied to the motor drive circuit.
REFERENCES:
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4423498 (1983-12-01), Kimura et al.
patent: 4546461 (1985-10-01), Isobe
patent: 4550347 (1985-10-01), Nakamuta
patent: 4575835 (1986-03-01), Nishikawa et al.
McElheny Jr. Donald
Pioneer Electronic Corporation
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