GB1337355A - Apparatus for charging a recording element with an electrostatic charge of a desired magnitude - Google Patents

Apparatus for charging a recording element with an electrostatic charge of a desired magnitude

Info

Publication number
GB1337355A
GB1337355A GB61372A GB61372A GB1337355A GB 1337355 A GB1337355 A GB 1337355A GB 61372 A GB61372 A GB 61372A GB 61372 A GB61372 A GB 61372A GB 1337355 A GB1337355 A GB 1337355A
Authority
GB
United Kingdom
Prior art keywords
switch
charge
frequency
corona generating
flop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB61372A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Publication of GB1337355A publication Critical patent/GB1337355A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0266—Arrangements for controlling the amount of charge

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

1337355 Automatic control of electrostatic charge; electro-photographic printing apparatus R C A CORPORATION 6 Jan 1972 [6 Jan 1971] 613/72 Headings G2H and G3R In electrostatic printing apparatus having a corona generating device applying charge to a surface, the charge is maintained at a desired value by varying the frequency or width of energizing pulses to the corona generating device. In an embodiment, an electro-photographic recording element 12, comprising a photoconductive layer 14 on a backing layer 16, is fed at constant speed between corona generating discharge wires 24, 26, which apply an electrostatic charge to the element, and past an exposure means (28) Fig.1 (not shown) utilizing a thin window cathode ray tube and a developing device (22) using liquid developer. A voltage proportional to the charge as measured by probe 34 is compared, with switch 70 in the position shown, with a desired value 76 in differential amplifier 74, any error being fed through switch 78 to vary the frequency of a free-running multivibrator 82, whose output pulses trigger a flipflop 84, having a preset output pulse width, to energize a shunt tube switch 96, the corona from corona generating wires 24, 26, fed from high voltage supply 98, being turned off when switch 96 is energized. With switch 70 in its alternative position, the pulse width of the flip-flop 84 is varied according to an error signal from amplifier 90, between the selected charge on the element 8 a desired reference 92, the multivibrator 82 running at a preset frequency. The multi-vibrator 82 and flip-flop 84 include triodes and variable resistances 80, 86 Fig.4 (not shown) to vary the frequency of pulse width, reversibly driven by motors according to the error signal from amplifiers 74, 90 respectively. The shunt tube switch 96 comprises a triode shorting the positive supply terminal i.e. discharge wire 24 to earth in response to a pulse from flip-flop 84. The reference valves 76, 92 may be adjustable, and discharge wire 24 replaced by a plate in contact with backing layer 16.
GB61372A 1971-01-06 1972-01-06 Apparatus for charging a recording element with an electrostatic charge of a desired magnitude Expired GB1337355A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10421771A 1971-01-06 1971-01-06

Publications (1)

Publication Number Publication Date
GB1337355A true GB1337355A (en) 1973-11-14

Family

ID=22299269

Family Applications (1)

Application Number Title Priority Date Filing Date
GB61372A Expired GB1337355A (en) 1971-01-06 1972-01-06 Apparatus for charging a recording element with an electrostatic charge of a desired magnitude

Country Status (11)

Country Link
US (1) US3699335A (en)
AU (1) AU464821B2 (en)
BE (1) BE777728A (en)
CA (1) CA937279A (en)
CH (2) CH547512A (en)
DE (1) DE2200110A1 (en)
FR (1) FR2120838A5 (en)
GB (1) GB1337355A (en)
IT (1) IT944292B (en)
NL (1) NL7200119A (en)
SE (1) SE375633B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896310A (en) * 1971-06-30 1975-07-22 Diagnostic Instr Inc Field control in imaging systems
US3805069A (en) * 1973-01-18 1974-04-16 Xerox Corp Regulated corona generator
JPS553704B2 (en) * 1974-03-20 1980-01-26
US3934141A (en) * 1974-07-03 1976-01-20 Xerox Corporation Apparatus for automatically regulating the amount of charge applied to an insulating surface
CA1116227A (en) * 1977-03-07 1982-01-12 Bell & Howell Company Controlled corona for charging electrostatic photocopy paper having zno binder layer
US4166690A (en) * 1977-11-02 1979-09-04 International Business Machines Corporation Digitally regulated power supply for use in electrostatic transfer reproduction apparatus
JPS5997161A (en) * 1982-11-27 1984-06-04 Olympus Optical Co Ltd Electrophotographic method
US4486808A (en) * 1982-12-03 1984-12-04 Polaroid Corporation Apparatus for controlling random charges on a moving web
WO1993011554A1 (en) * 1991-12-03 1993-06-10 Graseby Dynamics Limited Corona discharge ionisation source
US5642254A (en) * 1996-03-11 1997-06-24 Eastman Kodak Company High duty cycle AC corona charger
US5742871A (en) * 1996-08-30 1998-04-21 Eastman Kodak Company High duty cycle sawtooth AC charger
US5839024A (en) * 1997-05-19 1998-11-17 Eastman Kodak Company Corona charging of a charge retentive surface
DE102005016962A1 (en) * 2005-04-13 2006-11-02 Ab Skf Arrangement with a three-phase machine and a frequency converter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885556A (en) * 1955-08-01 1959-05-05 Haloid Xerox Inc Simultaneous charging device and method
US3076092A (en) * 1960-07-21 1963-01-29 Xerox Corp Xerographic charging apparatus
US3335274A (en) * 1964-12-04 1967-08-08 Xerox Corp Xerographic charging apparatus with means to automatically control the potential applied to the corona wire
US3586908A (en) * 1969-02-28 1971-06-22 Robert E Vosteen Automatic potential control system for electrophotography apparatus

Also Published As

Publication number Publication date
AU464821B2 (en) 1975-09-11
NL7200119A (en) 1972-07-10
DE2200110A1 (en) 1972-07-27
SE375633B (en) 1975-04-21
CH547512A (en) 1974-03-29
BE777728A (en) 1972-05-02
AU3755472A (en) 1973-07-05
CA937279A (en) 1973-11-20
IT944292B (en) 1973-04-20
US3699335A (en) 1972-10-17
CH552229A (en) 1974-07-31
FR2120838A5 (en) 1972-08-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees