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Browse Prior Art Database

Monitoring of Both Electrostatic And High Voltage Values

IP.com Disclosure Number: IPCOM000119689D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Hopper, SN: AUTHOR [+2]

Abstract

To maintain consistently good print quality in electrophotographic machines, photoreceptor surface potentials and high-voltage developer roll bias voltages need to be at proper values. Disclosed is a method to measure inputs from both an electrostatic probe and a high voltage source by using the same device for the improvement of print quality in an electrophotographic engine.

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This is the abbreviated version, containing approximately 56% of the total text.

Monitoring of Both Electrostatic And High Voltage Values

      To maintain consistently good print quality in
electrophotographic machines, photoreceptor surface potentials and
high-voltage developer roll bias voltages need to be at proper
values.  Disclosed is a method to measure inputs from both an
electrostatic probe and a high voltage source by using the same
device for the improvement of print quality in an electrophotographic
engine.

      A representative electrophotographic engine is illustrated in
the figure.  The system consists of photoreceptor 1, photoreceptor
charging corona 2, photoreceptor discharge device 3, electrostatic
sensor 4, developer with high-voltage-biased magnetic transport roll
5, transfer corona 6, and cleaning station 7.  Also shown is
electrostatic probe controller 8 with an additional input used for
measuring the high voltage present on the magnetic transport roll 5.
Previously, the only duty of the probe controller was to monitor
electrostatic sensor 4.

      The electrostatic controller is designed so that it can be used
under microcode or automatic hardware control to select which input
is to be measured.  Each input is measured with the same circuitry to
provide accurate or equally biased readings in all circumstances.
The entire output signal circuitry is shared to minimize variations
between actual readings from separate inputs.

      Using intelligent microcode systems or automatic hardware
circuits, the controll...