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Patent Searching and Data


Title:
SPEED CONTROLLER OF MOTOR FOR IMAGE FORMING DEVICE
Document Type and Number:
Japanese Patent JPH03198686
Kind Code:
A
Abstract:

PURPOSE: To effectively control a PLL speed even immediately after a motor is rotated by starting the motor after a rotation command signal of the motor is input, and releasing the start when predetermined number of rotation pulse signals are counted.

CONSTITUTION: A speed difference detection circuit 30 obtains the period of an encoder signal EN by using a reference clock signal fs in a counter. A composite circuit 50 receives a pulse width modulation signal PWM from a modulator 40, and outputs a speed control signal SR. The signal SR varies at its ratio of ON/OFF time in response to the signal EN, and controls a current to a motor 100 to control the rotating speed of the motor 100. Thus, the motor 100 reciprocates while being controlled at its speed, and the motor 100 is stopped if a motor rotation/stop command signal CONT becomes low when an optical system reciprocates at a distance response to an original size.


Inventors:
SAKATA TOMOSHI
SATO KAZUO
GOTO YUICHI
AZUMAI MITSUO
HOTTA IKUYA
Application Number:
JP33510689A
Publication Date:
August 29, 1991
Filing Date:
December 26, 1989
Export Citation:
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Assignee:
KONISHIROKU PHOTO IND
International Classes:
H02P29/00; H02P7/29; H02P7/293; H02P29/20; H02P29/40; (IPC1-7): H02P5/00; H02P5/17
Attorney, Agent or Firm:
Hiroo Suzuki