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:
Mar. 20, 2001
Filed:
Jul. 22, 1998
Yoshiki Hirose, Daito, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
For intermittent slow activation, jitter is caused for reproduced image due to increase in the relative speed of a magnetic tape and a magnetic head. To solve this problem, a rotating speed of a drum motor,must also be increased. Then, a microcomputer,generates a control output PWM using as PWM data a value obtained by adding a prescribed value to a command value of a normal rotating speed, so as to perform correction control for activation. Thereby, correction to constant speed can always be achieved even when there is a difference between operating points of drum motor,due to the change in PWM data at the normal speed. Further, since jitter is caused for reproduced image due to the change in the relative speed of the magnetic tape and the magnetic head in braking a capstan motor,jitter is corrected by subtracting a prescribed value from the drum control PWM data at the normal rotating speed.