GB1437911A - - Google Patents

Info

Publication number
GB1437911A
GB1437911A GB199874A GB199874A GB1437911A GB 1437911 A GB1437911 A GB 1437911A GB 199874 A GB199874 A GB 199874A GB 199874 A GB199874 A GB 199874A GB 1437911 A GB1437911 A GB 1437911A
Authority
GB
United Kingdom
Prior art keywords
voltage
jan
photo
resistor
variation
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
GB199874A
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 filed Critical
Publication of GB1437911A publication Critical patent/GB1437911A/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)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

1437911 Automatic control XEROX CORP 16 Jan 1974 [18 Jan 1973] 1998/74 Heading G3N An apparatus for charging a surface comprises a corona generator and means for automatically regulating the generator to compensate for variation in charge acceptance of the surface as the temperature of the surface changes. As shown, a coronode wire 72 extends along the length of shield 70 and is spaced from a photo-conductive surface 12 of a drum 10 forming part of an electro-photographic printing machine. A thermistor 98, connected in parallel with a resistor 100, provides a temperature dependence substantially simulating the variation of charge acceptance of the photo-conductive surface. The voltage at a terminal 84 which is a function of the current through a resistor 88 and the simulation is compared with a reference voltage from a source 76. The error signal is amplified in an amplifier 78, the output of which varies the voltage generated by a high-voltage source 92 through an input controller 90, so as to tend to maintain at a uniform level the charge accepted by the surface 12.
GB199874A 1973-01-18 1974-01-16 Expired GB1437911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00324628A US3805069A (en) 1973-01-18 1973-01-18 Regulated corona generator

Publications (1)

Publication Number Publication Date
GB1437911A true GB1437911A (en) 1976-06-03

Family

ID=23264412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB199874A Expired GB1437911A (en) 1973-01-18 1974-01-16

Country Status (7)

Country Link
US (1) US3805069A (en)
JP (1) JPS5438901B2 (en)
CA (1) CA1023791A (en)
DE (1) DE2359532B2 (en)
FR (1) FR2214916B1 (en)
GB (1) GB1437911A (en)
NL (1) NL161594C (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2611503C2 (en) * 1975-04-28 1986-09-04 Xerox Corp., Rochester, N.Y. Electrostatic copier
US3980929A (en) * 1975-07-07 1976-09-14 Xerox Corporation Corona current interrupter
US4140962A (en) * 1977-06-09 1979-02-20 Xerox Corporation High voltage regulator using light dependent resistor
JPS5480360U (en) * 1977-11-17 1979-06-07
JPS5529856A (en) * 1978-08-24 1980-03-03 Canon Inc Image former
GB2039101B (en) * 1978-08-24 1983-05-25 Canon Kk Control of electrostatic recording apparatus
JPS5536856A (en) * 1978-09-06 1980-03-14 Matsushita Electric Ind Co Ltd High voltage power source device for electrophotographic copier
US4322156A (en) * 1979-08-14 1982-03-30 Tokyo Shibaura Denki Kabushiki Kaisha Charging apparatus for copying machine
JPS5669660A (en) * 1979-11-09 1981-06-11 Nagano Aichi Denki Kk Power supply device for copying machine
JPS56142556A (en) * 1980-04-09 1981-11-06 Konishiroku Photo Ind Co Ltd Malfunction preventing circuit of control circuit
JPS5766445A (en) * 1980-10-11 1982-04-22 Ricoh Co Ltd Controlling method for extent of charging of electrophotographic copying machine
US4417804A (en) * 1981-06-19 1983-11-29 Xerox Corporation High voltage comparator for photoreceptor voltage control
JPS58136063A (en) * 1982-02-08 1983-08-12 Fuji Xerox Co Ltd Corona discharger of electrophotographic copying machine
JPS5972067A (en) * 1982-10-18 1984-04-23 Toshiba Corp Detector for abnormality of electrifier
JPS59105661A (en) * 1982-12-10 1984-06-19 Ricoh Co Ltd Image controlling method in electrophotographic copying machine
US4512652A (en) * 1983-08-24 1985-04-23 Xerox Corporation Control scheme compensating for changing characteristics of a photoconductive member used in an electrophotographic printing machine
US4551784A (en) * 1984-06-29 1985-11-05 Xerox Corporation Corona generating device
JPS63142371A (en) * 1986-12-05 1988-06-14 Toshiba Corp Image forming device
US5079669A (en) * 1989-04-10 1992-01-07 Williams Bruce T Electrophotographic charging system and method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3586908A (en) * 1969-02-28 1971-06-22 Robert E Vosteen Automatic potential control system for electrophotography apparatus
US3699335A (en) * 1971-01-06 1972-10-17 Rca Corp Apparatus for charging a recording element with an electrostatic charge of a desired amplitude

Also Published As

Publication number Publication date
US3805069A (en) 1974-04-16
FR2214916A1 (en) 1974-08-19
NL161594B (en) 1979-09-17
DE2359532A1 (en) 1974-07-25
NL161594C (en) 1980-02-15
FR2214916B1 (en) 1977-06-10
JPS5438901B2 (en) 1979-11-24
JPS49106336A (en) 1974-10-08
DE2359532B2 (en) 1979-02-22
CA1023791A (en) 1978-01-03
NL7400133A (en) 1974-03-25

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee