Optical: systems and elements – Prism – With reflecting surface
Patent
1990-10-02
1992-07-14
Perkey, W. B.
Optical: systems and elements
Prism
With reflecting surface
359554, G03B 500, G02B 2764
Patent
active
051307294
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.
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Matsuzawa Yoshinori
Sato Yuta
Olympus Optical Co,. Ltd.
Perkey W. B.
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