| 摘要 |
The present invention provides methods and apparatus for rapidly starting or bringing an oscillating device to its resonant frequency, and operating deflection amplitude. The invention is particularly applicable for use with an oscillating mirror used as the scanning engine of a laser printer. Control circuitry of the oscillating device first determines the resonant frequency of the device and then adjusts or increases the duty cycle of successive energy drive pulses until a selected deflection amplitude is reached. Energy drive pulses at the resonant frequency of the device and the adjusted duty cycle are then provided to maintain oscillation of the device. In a laser printer, a single sensor is used to determine the deflection amplitude of the resonant beam sweep by determining the spacing or timing between a pair of the sensors pulses. |
