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High voltage power supplying apparatus and image forming apparatus having the same

一种高压电源、压电变压器的技术，应用在压电/电致伸缩/磁致伸缩器件、应用电荷图形的电记录工艺的设备、应用电荷图形的电记录工艺等方向，能够解决时间延长等问题

Inactive Publication Date: 2011-06-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This may prolong the time required to prepare for image formation

Method used

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  • High voltage power supplying apparatus and image forming apparatus having the same
  • High voltage power supplying apparatus and image forming apparatus having the same
  • High voltage power supplying apparatus and image forming apparatus having the same

Examples

Experimental program
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Embodiment Construction

[0014] First, a first embodiment of the present invention will be described.

[0015] The present invention switches the frequency of a pulse signal to be sent to a piezoelectric transformer step by step, detects a voltage output from the piezoelectric transformer for each frequency, and determines a frequency at which the detected voltage is equal to a predetermined target voltage. This operation will be called a sweep operation. Note that the target voltage is set to the voltage required by the load supplied with voltage from the high-voltage power supply device. For an image forming apparatus such as a color laser printer, the subject loads are a charging unit for charging an image carrier, a developing unit for developing a latent image formed on the image carrier, and a device for carrying the image. A transfer unit that transfers a toner image formed on a body to a sheet of printing paper. High voltages to be output to these loads correspond to charging bias, developin...

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PUM

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Abstract

The invention relates to a high voltage power supplying apparatus and an image forming apparatus having the same. In the high voltage power supplying apparatus, a pulse generation unit generates a pulse signal with a predetermined frequency. A piezoelectric transformer outputs a voltage in accordance with the frequency of the pulse signal. A detection unit detects an output voltage of the piezoelectric transformer. A control unit controls the pulse generation unit to change the frequency of the pulse signal by a predetermined value towards a frequency corresponding to a target voltage until the output voltage becomes equal to the target voltage. A storage unit stores data indicating the frequency when the output voltage reaches the target voltage. The control unit controls the output voltage to be equal to the target voltage by variably controlling the frequency of the pulse signal by a value smaller than the predetermined frequency from the frequency corresponding to the data stored in the storage unit.

Description

technical field [0001] The present invention generally relates to a high-voltage power supply device using a piezoelectric transformer, and more particularly, to an image forming device using the high-voltage power supply device. Background technique [0002] An electrophotographic image forming apparatus requires a high-voltage power supply device to generate a voltage (high voltage) higher than several hundred volts (V). This is because the image forming apparatus applies a DC (direct current) bias to the transfer member. While conventional high-voltage power supply equipment uses a wire-wound electromagnetic transformer, recent high-voltage power supply equipment uses piezoelectric transformers (piezoelectric ceramic transformers). [0003] Japanese Patent Laid-Open No. 11-206113 discloses a high-voltage power supply device having a voltage-controlled oscillator (VCO) that generates a frequency to be input to a piezoelectric transformer. Piezoelectric transformers have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335G03G15/00H10N30/80
CPCH02M3/33507H01L41/044H10N30/804G03G21/00H02J1/00
Inventor 高山裕司山口敦彦
Owner CANON KK
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