Title: Apparatus for controlling the rotation of a rotating body in a recording and/or reproducing apparatus

Abstract: The invention provides an apparatus for controlling the rotation of a rotating body in a recording and/or reproducing apparatus. First, the apparatus detects the rotational speed of the rotating body, as it is driven by a DC motor. Detection is in terms of a frequency which is n times the speed, in which n>> 1. Second, there is a detection of the rotational phase of the rotating body. The DC motor is driven to rotate in accordance with a controlling signal obtained by using first and second output error signals responsive to the first and second detections. The DC motor is driven by means for superimposing an AC signal generated with a constant period and the first and second output error signals. The superimposed signals are sliced at a predetermined level to perform "ON" - "OFF" operations and a smooth output to control the driving rotation of the DC motor.

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Inventors: Fujita, Mitsuo (Tokyo, JA)
Sakaki, Naoaki (Murayama, JA)

Application Number: 384681
Filing Date: 1973-08-01
Publication_date: 1976-01-20
Assignee: Victor Company of Japan, Limited (Yokohama, JA)
Primary Class(es): 360/70 360/75, 388/812, 388/902, 388/903, 388/915
Other Classes:
US Patent Ref:

3086157	Apr, 1963	Branco	318/328.
3152226	Oct, 1964	Stratton	360/75.
3355649	Nov, 1967	Boylan	318/314.
3356921	Dec, 1967	Bradford	318/314.
3542949	Nov, 1970	Tanaka	360/70.
3577056	May, 1971	Tsujikawa	318/318.
3651276	Mar, 1972	Clark	360/70.
3663764	May, 1972	Trost	360/70.
3663884	May, 1972	Pattantyus	328/134.
3686432	Aug, 1972	Deguchi	360/70.

Other Refs:
Primary Examiner: Konick, Bernard
Assistant Examiner: Faber, Alan
Attorney: