JPS51117050A - Charge control device for automatic duplicator - Google Patents

Charge control device for automatic duplicator

Info

Publication number
JPS51117050A
JPS51117050A JP50041185A JP4118575A JPS51117050A JP S51117050 A JPS51117050 A JP S51117050A JP 50041185 A JP50041185 A JP 50041185A JP 4118575 A JP4118575 A JP 4118575A JP S51117050 A JPS51117050 A JP S51117050A
Authority
JP
Japan
Prior art keywords
duplicator
automatic
control device
charge control
high speed
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.)
Granted
Application number
JP50041185A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5424862B2 (enExample
Inventor
Tadashi Yamashita
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP50041185A priority Critical patent/JPS51117050A/ja
Priority to US05/672,236 priority patent/US4034221A/en
Publication of JPS51117050A publication Critical patent/JPS51117050A/ja
Publication of JPS5424862B2 publication Critical patent/JPS5424862B2/ja
Granted 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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
    • G03G15/047—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas for discharging non-image areas
    • 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
    • G03G15/0275—Arrangements for controlling the area of the photoconductor to be charged
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0436—Document properties at the scanning position, e.g. position and density
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0443—Copy medium outline relative to the charge image
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0448—Charge-erasing means for the non-image area

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
JP50041185A 1975-04-07 1975-04-07 Charge control device for automatic duplicator Granted JPS51117050A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP50041185A JPS51117050A (en) 1975-04-07 1975-04-07 Charge control device for automatic duplicator
US05/672,236 US4034221A (en) 1975-04-07 1976-03-31 Charging device for automatic copying apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50041185A JPS51117050A (en) 1975-04-07 1975-04-07 Charge control device for automatic duplicator

Publications (2)

Publication Number Publication Date
JPS51117050A true JPS51117050A (en) 1976-10-14
JPS5424862B2 JPS5424862B2 (enExample) 1979-08-24

Family

ID=12601349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50041185A Granted JPS51117050A (en) 1975-04-07 1975-04-07 Charge control device for automatic duplicator

Country Status (2)

Country Link
US (1) US4034221A (enExample)
JP (1) JPS51117050A (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4408865A (en) * 1981-11-23 1983-10-11 Hewlett Packard Company Corona discharge device for electrophotographic charging and potential leveling
US5099282A (en) * 1982-04-15 1992-03-24 Canon Kabushiki Kaisha Variable magnification image forming apparatus
JP6402989B2 (ja) * 2014-07-25 2018-10-10 株式会社リコー 画像形成装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324291A (en) * 1964-07-06 1967-06-06 Xerox Corp Corona generating device with means to cause air flow therethrough to maintain the parts free of dust accumulation
US3685894A (en) * 1968-01-22 1972-08-22 Addressograph Multigraph Photoelectrostatic copying machine having lamps for exposing copy margins
JPS4922185U (enExample) * 1972-05-30 1974-02-25
JPS4943337A (enExample) * 1972-08-31 1974-04-24
JPS49123042A (enExample) * 1973-03-27 1974-11-25
JPS5034544A (enExample) * 1973-07-27 1975-04-02

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307034A (en) * 1963-12-09 1967-02-28 Xerox Corp Two-wire corona discharge system for single-step electrostatic image formation
US3749927A (en) * 1970-07-03 1973-07-31 Fuji Photo Film Co Ltd Electrostatic charging process for electrophotographic photosensitive material
JPS4829441A (enExample) * 1971-08-20 1973-04-19
US3816749A (en) * 1972-11-15 1974-06-11 A North Exposure controlled corona device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324291A (en) * 1964-07-06 1967-06-06 Xerox Corp Corona generating device with means to cause air flow therethrough to maintain the parts free of dust accumulation
US3685894A (en) * 1968-01-22 1972-08-22 Addressograph Multigraph Photoelectrostatic copying machine having lamps for exposing copy margins
JPS4922185U (enExample) * 1972-05-30 1974-02-25
JPS4943337A (enExample) * 1972-08-31 1974-04-24
JPS49123042A (enExample) * 1973-03-27 1974-11-25
JPS5034544A (enExample) * 1973-07-27 1975-04-02

Also Published As

Publication number Publication date
US4034221A (en) 1977-07-05
JPS5424862B2 (enExample) 1979-08-24

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