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:
Jul. 14, 1992
Filed:
Oct. 02, 1990
Yuta Sato, Hachioji, JP;
Yoshinori Matsuzawa, Hino, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An acceleration of a vibration generated in an optical system of, e.g., a camera is detected by a subtracter from output signals of acceleration sensors. An absolute value circuit calculates an absolute value of an acceleration signal from the subtracter. A voltage-controlled oscillator (VCO) generates clocks having a frequency corresponding to a magnitude of the absolute value from the absolute value circuit. The clocks from the VCO are input to a clock terminal of an up/down counter. An ultrasonic motor (USM) drives the optical system in a direction to cancel the vibration. The USM is driven and controlled by a USM control circuit so as to be rotated at a speed corresponding to a count value of the counter. A motor speed detector detects a USM motor speed from output signals of a rotary encoder. An integrator integrates the acceleration signal from the subtracter to obtain a vibration speed. A comparator compares the USM motor speed with the vibration speed and outputs a comparison result to an up/down terminal of the counter, thereby switching between count-up and count-down operations of the counter.