GB1447819A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine

Info

Publication number
GB1447819A
GB1447819A GB383875A GB383875A GB1447819A GB 1447819 A GB1447819 A GB 1447819A GB 383875 A GB383875 A GB 383875A GB 383875 A GB383875 A GB 383875A GB 1447819 A GB1447819 A GB 1447819A
Authority
GB
United Kingdom
Prior art keywords
lamp
station
photo
exposure
sensing device
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
GB383875A
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1447819A publication Critical patent/GB1447819A/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
    • G03G15/04—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
    • 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
    • G03G2215/0439—Automatic detection of properties
    • 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
    • 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
    • G03G2215/0468—Image area information changed (default is the charge image)
    • G03G2215/047—Image corrections
    • G03G2215/0473—Image corrections due to document imperfections, e.g. punchholes, books
    • 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
    • G03G2215/0468—Image area information changed (default is the charge image)
    • G03G2215/048—Technical-purpose-oriented image area changes
    • G03G2215/0482—Toner-free areas produced
    • G03G2215/0485—Avoiding problems in standard processing steps, such as transfer and fixing
    • 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
    • G03G2215/0468—Image area information changed (default is the charge image)
    • G03G2215/0492—Without changing the charge image

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

1447819 Electro-photographic copiers INTERNATIONAL BUSINESS MACHINES CORP 29 Jan 1975 [14 Feb 1974] 3838/75 Headings G2A and G2H An electro-photographic copying machine comprises a photo-conductive surface 12 which is movable past an exposure station 14, a development station 40 and a transfer corona station 16 for transferring powder images on the surface 12 to copy sheets 17 which are subsequently moved to a direct contact heat fusing unit 51, the exposure station including an optical scanning apparatus 20 for producing incremental images from an exposure window 31 and directing them via mirrors 33, 34 to the surface 12, and a light intensity sensing device 70 for sensing the average intensity of each incremental image produces a predetermined signal in response to the sensing of an average intensity below a predetermined threshold, the signal being used to operate reducing means such as an erase lamp 60, whereby unwanted powder at the leading edge of a copy sheet due to an uncovered portion 29 of the exposure window 31 is avoided. The scanning apparatus 20 includes a lens 21 mounted on a carriage 22 moving in synchronism with the surface 12 which is illuminated by a narrow light beam from a stationary light 35 via a stationary dichroic mirror 36 and a moving mirror 26 mounted on a carriage 27 moving also in synchronism with the surface 12. The development station 40 includes a magnetic brush unit 42. The lamp 60 is used to erase the photoconductor 12 between the images intended for successive copy sheets under the control of a cam 61 and switches 62, 63, and a further switch (65), Fig. 2 (not shown), is operated by non-closure of a cover 37 having a white background 38, to make operation of the lamp 60 dependent on the sensing device 70. The light intensity sensing device 70, Fig. 3 (not shown), comprises a photo-transistor (90) and control circuitry therefor, Fig. 4 (not shown) includes a delay device (66) which allows for the time for a point on the photo-conductive surface 12 to move from the exposure station 14 to the lamp 60. Deposition of unwanted powder at the leading edge of a copy sheet may, alternatively, be prevented by increasing the bias voltage on the magnetic brush unit 42 to a level approaching the discharge level on the surface 12, or the transfer corona 16 may be controlled so as not to transfer the unwanted powder.
GB383875A 1974-02-14 1975-01-29 Electrophotographic copying machine Expired GB1447819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00442533A US3834807A (en) 1974-02-14 1974-02-14 Copier with leading edge image control

Publications (1)

Publication Number Publication Date
GB1447819A true GB1447819A (en) 1976-09-02

Family

ID=23757173

Family Applications (1)

Application Number Title Priority Date Filing Date
GB383875A Expired GB1447819A (en) 1974-02-14 1975-01-29 Electrophotographic copying machine

Country Status (13)

Country Link
US (1) US3834807A (en)
JP (1) JPS5925219B2 (en)
BE (1) BE824343A (en)
CA (1) CA1035004A (en)
CH (1) CH581852A5 (en)
DE (1) DE2505833C2 (en)
DK (1) DK142634B (en)
FR (1) FR2261558B1 (en)
GB (1) GB1447819A (en)
IL (1) IL46565A (en)
IT (1) IT1027651B (en)
NL (1) NL7500896A (en)
SE (1) SE391591B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211470A (en) * 1987-10-27 1989-07-05 Ricoh Kk Control device for an electrophotographic copier

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50122263A (en) * 1974-02-19 1975-09-25
JPS5123724A (en) * 1974-08-06 1976-02-25 Ricoh Kk Fukushakitoniokeru suritsutoshomeisochi
JPS5173434A (en) * 1974-12-23 1976-06-25 Canon Kk Rokosochi
US3998541A (en) * 1975-04-18 1976-12-21 Eastman Kodak Company Illumination arrangement providing for interframe flashdown
NL7507493A (en) * 1975-06-24 1976-12-28 Oce Van Der Grinten Nv COPIER.
US4046471A (en) * 1975-11-03 1977-09-06 International Business Machines Corporation Dual mode electrophotographic apparatus having dual function printing beam
US4118119A (en) * 1976-09-02 1978-10-03 Xerox Corporation Facetted edge fadeout reflector
US4162845A (en) * 1977-09-15 1979-07-31 Xerox Corporation Copier for greater than standard length documents
US4179213A (en) * 1978-04-10 1979-12-18 International Business Machines Corporation Vector pinning in an electrophotographic machine
US4183657A (en) * 1978-04-10 1980-01-15 International Business Machines Corporation Dynamic reference for an image quality control system
US4178095A (en) * 1978-04-10 1979-12-11 International Business Machines Corporation Abnormally low reflectance photoconductor sensing system
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4431301A (en) * 1980-03-12 1984-02-14 Tokyo Shibaura Denki Kabushiki Kaisha Electrostatic copying apparatus with means for preventing contamination of reverse side of copying medium
CA1173890A (en) * 1980-08-28 1984-09-04 John H. Dodge Control of copier start-up operations
US4463284A (en) * 1981-07-28 1984-07-31 Konishiroku Photo Industry Co., Ltd. Method and apparatus for controlling luminous intensity of fluorescent lamp of reproducing apparatus
JPS5823033A (en) * 1981-08-03 1983-02-10 Fuji Xerox Co Ltd Electrophotographic method
DE3334362A1 (en) * 1982-09-25 1984-03-29 Canon K.K., Tokyo IMAGE GENERATION DEVICE
JPS5968728A (en) * 1982-10-12 1984-04-18 Canon Inc Detecting device of original
DE3341774C3 (en) * 1982-11-20 1994-09-01 Canon Kk Device for the partial discharge of a photoconductive recording material
US4505575A (en) * 1983-08-26 1985-03-19 Xerox Corporation Non-image erase system for reproduction machines
US4655579A (en) * 1984-08-30 1987-04-07 Ricoh Company, Ltd. Multicolored image forming apparatus
US4725868A (en) * 1985-06-17 1988-02-16 Mita Industrial Co., Ltd. Electrostatic copying machine
JPS63274973A (en) * 1987-05-06 1988-11-11 Ricoh Co Ltd Eraser lighting controller for copying machine
JPS63194616U (en) * 1987-05-30 1988-12-14
US4914483A (en) * 1989-04-17 1990-04-03 Eastman Kodak Company Electrostatographic transfer with artifact suppression
JP3162358B2 (en) * 1989-04-30 2001-04-25 株式会社リコー Digital copier
JP3089133B2 (en) * 1993-05-18 2000-09-18 東北リコー株式会社 Image processing device
US5802215A (en) * 1996-12-17 1998-09-01 Xerox Corporation Quadrant-based density detection for lead edge lightening

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135179A (en) * 1959-04-02 1964-06-02 Xerox Corp Xerographic apparatus
BE793559A (en) * 1971-12-30 1973-06-29 Xerox Corp ELECTROSTATOGRAPHIC MACHINE INCLUDING AN EXPOSURE PRE-DEVELOPMENT DEVICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211470A (en) * 1987-10-27 1989-07-05 Ricoh Kk Control device for an electrophotographic copier
GB2211470B (en) * 1987-10-27 1991-05-15 Ricoh Kk Control device for a copier

Also Published As

Publication number Publication date
CH581852A5 (en) 1976-11-15
BE824343A (en) 1975-05-02
IT1027651B (en) 1978-12-20
JPS5925219B2 (en) 1984-06-15
US3834807A (en) 1974-09-10
DE2505833C2 (en) 1982-12-02
IL46565A (en) 1977-12-30
FR2261558A1 (en) 1975-09-12
DK50575A (en) 1975-10-13
IL46565A0 (en) 1975-04-25
FR2261558B1 (en) 1978-12-22
SE391591B (en) 1977-02-21
NL7500896A (en) 1975-08-18
JPS50115832A (en) 1975-09-10
DK142634B (en) 1980-12-01
DE2505833A1 (en) 1975-08-28
SE7501420L (en) 1975-08-15
DK142634C (en) 1981-08-03
CA1035004A (en) 1978-07-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee