Patent ID: 7606514
Filing Date: 2009-10-20
Classification: G03G

Abstract:
1. A belt driving apparatus using feedback signals for executing feedback control of a motor that drives a rotation of a belt, the belt driving apparatus comprising: a first sensor for detecting an index of a scale formed along a peripheral direction of the belt; a second sensor for detecting a detection target cooperatively moving with the rotation of the belt; and a sensor switching part for selectively switching the feedback signals used for executing the feedback control of the motor, the feedback signals including first signals output from the first sensor and second signals output from the second sensor; wherein the sensor switching part selects the second signals as the feedback signals to be used during a period beginning at an activation of the motor and ending when a condition is satisfied, wherein the sensor switching part selects the first signals as the feedback signals to be used after the condition is satisfied with an exception that the use of the second signals as the feedback signals is continued even after the condition is satisfied without switching to use the first signals when a waveform of the first signals is irregular.