Measuring and testing – Simulating operating condition – Marine
Patent
1994-08-12
1995-08-29
Chilcot, Richard
Measuring and testing
Simulating operating condition
Marine
388921, 318567, G01N 1500
Patent
active
054450179
ABSTRACT:
The present invention is suitable for examination of the rotating state of a Polygonal mirror motor in an image forming apparatus. It is judged whether or not the rotational speed of the motor is a target speed until a first time period has elapsed since the supply of power to the motor for rotating a Polygonal mirror was started every other second time period sufficiently shorter than the first time period and continuously checked over a third time period which is sufficiently shorter than the second time period. If it is judged that the rotational speed of the motor is the target speed continuously for the third time period, it is judged again whether or not the rotational speed of the motor is the target speed after an elapse of a fourth time period since the judgment. If the rotational speed of the motor is the target speed, the motor outputs a signal indicating that the motor is stabilized at the target speed. If the rotational speed of the motor is not the target speed, the motor further waits until a fifth time period has elapsed for judging whether or not the rotational speed of the motor is the target speed. If the rotational speed of the motor is the target speed, the motor outputs a signal indicating that the motor is stabilized at the target speed. Image formation processing is performed in response to the signal indicating that the motor is stabilized at the target speed.
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Chilcot Richard
McCall Eric S.
Mita Industrial Co. Ltd.
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