Title:
CIRCUIT FOR DRIVING SHUTTER OF DIGITAL CAMERA
Document Type and Number:
Japanese Patent JP2003043554
Kind Code:
A
Abstract:
To accurately control a current value to a motor coil of a shutter motor.
A rise in voltage at the positive input end of a current-control amplifier 16 is controlled by charging a capacitor 26 with a constant current from a constant-current circuit 22. Thus, the variation in voltage at the upper side of a current detecting resistor 14 when starting driving of the motor is controlled to be constant irrespective of fluctuation in a power source voltage, and thereby the current flowing through the motor coil 10 is controlled with accuracy.
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Inventors:
YOSHITOMI TETSUYA
SOMEYA TAKASHI
SOMEYA TAKASHI
Application Number:
JP2001228356A
Publication Date:
February 13, 2003
Filing Date:
July 27, 2001
Export Citation:
Assignee:
SANYO ELECTRIC CO
International Classes:
G03B7/091; G03B9/08; H02P7/06; (IPC1-7): G03B9/08; G03B7/091; H02P7/06
Domestic Patent References:
JPS58149026A | 1983-09-05 | |||
JPS57197622A | 1982-12-03 | |||
JPS58149026A | 1983-09-05 | |||
JPS57197622A | 1982-12-03 |
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)
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