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Charging Device with Point by Point Voltage Control

IP.com Disclosure Number: IPCOM000033704D
Publication Date: 2004-Dec-23
Document File: 4 page(s) / 72K

Publishing Venue

The IP.com Prior Art Database

Abstract

Charging of an imaging surface is often non-uniform across the surface. Previous efforts to improve uniformity include scorotron grids, corotron pins, etc. Individual pins of pin charging device can be controlled individually by independent circuitry. This allows the individual pins to have the appropriate voltage to produce a uniform charge on the imaging device. This technique can be used with or without a (scorotron) grid between the pin charging device and the imaging device.

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Charging Device with Point by Point Voltage Control

Charging of an imaging surface is often non-uniform across the surface.  Previous efforts to improve uniformity include scorotron grids, corotron pins, etc.

Individual pins of pin charging device can be controlled individually by independent circuitry. This allows the individual pins to have the appropriate voltage to produce a uniform charge on the imaging device. This technique can be used with or without a (scorotron) grid between the pin charging device and the imaging device.   Three versions are shown below

Schematic:

Diagram:

Description:

The charging device is a series of individual pins or wire segments mounted on a nonconductive substrate.  Each charge pin is connected to the voltage source via a voltage amplifier.  Each voltage amplifier is connected to the address decoder and a data buss decoder.  The address decoder and data buss decoder are routed to the system buss of the image output terminal (IOT).

Based on the IOT function, each charging pin can be activated individually via control signals from the IOT system buss.  The address decoder selects the chosen charge pin amplifier.  Based on required charge strength, the amplifier gain is set from the data buss decoder.  The gain of each amplifier would be correlated to the desired pin charge.

By utilizing this method the charge can be varied on each pin, from full off to full on with steps in between.  This will allow the IOT to have more control over the output image quality of every document.  Highlighting, contrast and grayscale can be more completely defined by integrating the output scanning device with charge pin control.

Application to Dual in-Line Charging Configurations

Dual row of in-line individual pins of pin charging device can be controlled by independent circuitry to individual voltages. This allows the individual pins to have the appropriate voltage to produce a uniform charge on the imaging device. This technique can be used with or without a (scorotron) grid between the pin charging device and the imaging device.  Device mimics a solid wire, but is not subject to catastrophic failure or hot spotting.

Schematic:

Diagram:

Description:

The Dual in-line-charging device is a series of individual pins (upper and lower) or wire segments mounted on a nonconductive substrate.  Each charge pin is connected to the voltage source via a voltage amplifier.  Each voltage amplifier is connected to the address decoder, and a data buss decoder.  The address decoder and data buss decoder are routed to the system buss of the IOT.

Based on the IOT function, each charging pin can be activated individually via control signals from the IOT system buss.  The address decoder selects the chosen charge pin amplifier.  Based on required charge strength, the amplifier gain is set from the data buss decoder.  The gain of each amplifier would be correlated to the desired pin charge.

As discussed above, by utilizing this met...