The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1987
Filed:
Mar. 18, 1985
Hitoshi Senso, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
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.