Transfer voltage controlling method and apparatus of image formi

Details Transfer voltage controlling method and apparatus of image formi Transfer voltage controlling method and apparatus of image formi

1998-05-07

1999-03-23

Braun, Fred L

Electrophotography

Control of electrophotography process

Responsive to copy media characteristic

399 66, G03G 1314, G03G 1514, G03G 2100

Patent

active

058872191

ABSTRACT:
A transfer voltage controlling apparatus of an image forming apparatus includes a high voltage unit installed at one side of a sheet for generating a magnetic field around the sheet by applying a high voltage to the sheet, a conductor unit installed at the other side of the sheet for forming an induced current by the magnetic field transmitted through the sheet, an A/D converter for converting an analog signal of the current induced to the conductor unit into a digital signal, a microcontroller for receiving the output signal of the A/D converter, comparing the received signal with a reference signal to detect thickness of the sheet, and generating a control command of the transfer voltage corresponding to the thickness of the sheet, and a high voltage controller for receiving the control command from the microcontroller and applying the transfer voltage having a predetermined magnitude to a transfer unit. Since the transfer voltage applied to a transfer unit is varied/controlled according to the thickness of the sheet as well as the ambient temperature and humidity, the transfer efficiency can be enhanced and a better quality image can be obtained, accordingly.

REFERENCES:
patent: 5140375 (1992-08-01), Shindo et al.
patent: 5568228 (1996-10-01), Tombs
patent: 5652943 (1997-07-01), Matsuo
patent: 5717980 (1998-02-01), Oka et al.

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