Driving mechanism for keeping feedback cycle constant, apparatus

Details Driving mechanism for keeping feedback cycle constant, apparatus Driving mechanism for keeping feedback cycle constant, apparatus

1998-11-20

2000-04-04

Perkey, W. B.

Photography

Camera shake sensing

Having stabilization system

310317, G03B 1700, H01L 4104

Patent

active

060471352

ABSTRACT:
A driving device, for driving a compensation lens of a camera, with a feedback control for an actuator therefor in which it is easy to keep a feedback cycle constant. In the feedback control, the feedback cycle is kept constant by counting the number of PWM pulses for driving the actuator. In case that the actuator is of a type in which it is controlled by more than one PWM pulse trains with different phases, one pulse train with predetermined phase is continuously supplied to the actuator even when the actuator is not driven, where the number of pulses in the one pulse train is counted so as to keep the feedback cycle constant. The actuator preferably employs a piezoelectric element which expands and contracts in response to a wave-form pulse included in the PWM pulse train.

REFERENCES:
patent: 5130729 (1992-07-01), Sato et al.
patent: 5587846 (1996-12-01), Miyano et al.
patent: 5768016 (1998-06-01), Kanbara
patent: 5783899 (1998-07-01), Okazaki
patent: 5907212 (1999-05-01), Okada
patent: 5917267 (1999-06-01), Miyazawa et al.

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