[54] APPARATUS FOR CONTROLLING THE ROTATION OF A ROTATING BODY IN A RECORDING AND/OR REPRODUCING APPARATUS
[75] Inventors: Mitsuo Fujita, Tokyo; Naoaki
Sakaki, Murayama, both of Japan
[73] Assignee: Victor Company of Japan, Limited,
Yokohama, Japan
[22] Filed: Aug. 1, 1973 [21] Appl. No.: 384,681
[30] Foreign Application Priority Data
Aug. 3, 1972 Japan 47-77814
Oct. 11, 1972 Japan 47-101145
Jan. 26, 1973 Japan 48-10887
Jan. 27, 1973 Japan 48-10692
[52] U.S. CI 360/70; 360/75; 318/314;
318/327
[51] Int. CI.2 G11B 21/04; Gl IB 21/02
[58] Field of Search 360/70, 75; 318/326, 328,
318/327, 318, 314; 328/133, 134; 307/233
[56] References Cited
UNITED STATES PATENTS
3,086,157 4/1963 Branco 318/328
3,152,226 10/1964 Stratton 360/75
3,355,649 11/1967 Boylan 318/314
3,356,921 12/1967 Bradford 318/314
3,542,949 11/1970 Tanaka 360/70
3,577,056 5/1971 Tsujikawa 318/318
3,651,276 3/1972 Clark 360/70
3,663,764 5/1972 Trost 360/70
3,663,884 5/1972 Pattantyus 328/134
3,686,432 8/1972 Deguchi 360/70
Primary Examiner—Bernard Konick
Assistant Examiner—Alan Faber
[57] 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>\. 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.
11 Claims, 15 Drawing Figures
