EP0103843A1 - Procédé de la préparation d'images colorées - Google Patents

Procédé de la préparation d'images colorées Download PDF

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Publication number
EP0103843A1
EP0103843A1 EP83109045A EP83109045A EP0103843A1 EP 0103843 A1 EP0103843 A1 EP 0103843A1 EP 83109045 A EP83109045 A EP 83109045A EP 83109045 A EP83109045 A EP 83109045A EP 0103843 A1 EP0103843 A1 EP 0103843A1
Authority
EP
European Patent Office
Prior art keywords
color
density
toner
photoconductive
apparent surface
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.)
Withdrawn
Application number
EP83109045A
Other languages
German (de)
English (en)
Inventor
Manfred R. Kuehnle
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.)
Coulter Systems Corp
Original Assignee
Coulter Systems 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 Coulter Systems Corp filed Critical Coulter Systems Corp
Publication of EP0103843A1 publication Critical patent/EP0103843A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0163—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member primary transfer to the final recording medium

Definitions

  • This invention relates generally to method of making color images, and more particularly obtaining a preselected optical density (Dmax) by controlling the apparent surface voltage level on the photoconductive surface of an electrophotographic member or other photoconductive member and allowing for fine Dmax adjustments with a relatively course adjustment of the apparent surface voltage and without consideration of any tonal degradation, the Dmax factor requirements varying with different color toners and different photoconductors.
  • Dmax optical density
  • an electrophotographic member described in the U.S-. Patent 4,025,339 or the U.S. 4,269,919. This member has'high speed and high resolution capability.
  • Electrophotographic color imaging involves the charging of the photoconductive surface of an electrophotographic member to an apparent surface voltage employing a corona generating device to apply said predetermined charge to said surface.
  • the charged surface is exposed to radiant energy projected through a color separation transparency whereby a latent electrostatic image is formed on the photoconductive surface.
  • a particular toner is applied to that latent electrostatic image to render the same visible.
  • Each of the different color toners which may be employed in producing a color image has individual, non-linear characteristics especially in the higher density portions which are particular to the toner establishing a relationship between the density gradation and the apparent surface voltage, established on the photoconductive surface.
  • the invention uses this relationship for the different toners employed to obtain and vary the desired density.
  • the desired Dmax density varies with each of the different color toners which may be employed.
  • the invention provides a method of incrementally varying the color Dmax of each toner image to a valve particularly corresponding to each color toner employed by selectively varying the apparent surface voltage applied to the photoconductive surface.
  • the invention herein provides a method of making color images, wherein a preselected Dmax density is obtained by coursely controlling the apparent surface voltage level (ASV) on the photoconductive surface of an electrophotographic member.
  • ASV apparent surface voltage level
  • a photoconductive member 10 having a downwardly facing photoconductive surface 12 is mounted on a carriage 14.
  • the carriage 14 is located at a home position over the exposure station.
  • a corona generating device 16 is provided adjacent the copyboard 20.
  • a source of radiant energy 18 is disposed beneath the copyboard 20.
  • a color separation transparency 22 is mounted on the copyboard 20.
  • An apparent surface voltage (ASV) sensor 24 is provided adjacent to the corona generating device 16.
  • the other functional stations include a toning station 26 and an image transfer station 28.
  • the carriage 14 moves in a predetermined path and the photoconductive surface 12 is transported to and past the functional stations.
  • Step 2 of Figure 1 illustrates the photoconductive surface being transported ' over the corona generating device 16 and ASV sensor 24.
  • a measurement signal 25 is provided from the ASV sensor 24 to a control unit 30.
  • Feedback control responsive to the measurement signal 25 from the ASV sensor 24 and the operator input corresponding to the desired density are provided to the corona generating device 16.
  • the control unit 30 can be provided for manual or automatic operation.
  • the control unit 30 will be generally described hereinafter.
  • FIG 2 a chart illustrating the general relationship between the level of the apparent surface voltage for one color toner, say, cyan.
  • cyan a color toner
  • four toners having the colors of yellow, magenta, cyan and black are employed to form the composite color image.
  • Each of the color toners has a separate curve corresponding to density in relation to the apparent surface voltage established on the photoconductive surface 12.
  • a toner of one color and hue can be provided separately with varying density ranges, as illustrated in Figure 2 with three curves, in order to provide the desired density requirements of the user.
  • Step 3 of Figure 1 illustrates the photoconductive member 10 returned to the home position over the exposure station.
  • the photoconductive surface 12 is provided in intimate contact engagement with the color separation transparency 22 that is mounted on the copyboard 20.
  • the photoconductive surface 12 is exposed to a predetermined intensity of radiant energy from source 18 through the color separation transparency 22 for a fixed period of time.
  • a latent electrostatic charge image is thereby formed on the photoconductive surface 12 corresponding to the image carried by the color separation transparency 22.
  • Step 4 of Figure 1 illustrates the photoconductive surface 12 being transported over the toning station 26.
  • the latent electrostatic image carried by the photoconductive surface 12 is developed or toned with a toner of the proper color.
  • a selected one of the toning units is energized causing a selected color toner to be applied to the photoconductive surface 12 causing the selected color toner particles to be deposited whereby the latent electrostatic image is rendered visible.
  • Step 5 of Figure 1 illustrates the photoconductive surface 12 carrying the toner image thereon disposed over the transfer station 28.
  • the toner image is transferred to a receptor member.
  • the color separation transparency 22 for the next color cycle is installed and the process, Steps 1 through 5, is repeated with the different transparency 22 and corresponding toner color.
  • the process is repeated for each of four transparencies and toner colors to produce the composite color proof.
  • the method of the invention provides for the fine adjustment of the density by controlling the level of the apparent surface voltage established on the photoconductive surface 12.
  • the ASV is established on the photoconductive surface 12 by translating the surface 12 in close proximity to the corona generating device 16.
  • the corona generating device 16 produces a corona discharge field or output level proportional to high voltage from a high voltage power supply applied to the corona generating device 16.
  • the ASV sensor 24 can be an electrometer that measures the ASV or charge level on the photoconductive surface and provides a measurement signal which is proportional to the signal 25 which is proportional to the ASV level.
  • the control unit 30 includes programmable memory capable of storing the non-linear characteristics for each of the color toners employed relating the density gradation . relative to changes in the apparent surface voltage of the photoconductive surface 12.
  • the control unit 30 is provided with the measurement signal 25 from the ASV sensor 24.
  • the operator provides an input corresponding to the desired or selected density for the particular color toner.
  • the control unit 30 determines the ASV level required from the desired density input and the characteristics of the particular color toner that are stored in the memory thereof.
  • the control unit compares the measurement signal 25 with the predetermined ASV level and deactivates the corona generating device 16 when the measured signal 25 equals the predetermined ASV level.
  • the operator uses a densitometer and measures the optical density of the color desired to be produced in the color image for each of the color toners.
  • This densitometer measurement comprises the operator input corresponding to the desired or selected density for the particular color toner.
  • the method herein is applicable for production of images wherein only a black toner is employed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
EP83109045A 1982-09-20 1983-09-13 Procédé de la préparation d'images colorées Withdrawn EP0103843A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41941882A 1982-09-20 1982-09-20
US419418 1982-09-20

Publications (1)

Publication Number Publication Date
EP0103843A1 true EP0103843A1 (fr) 1984-03-28

Family

ID=23662175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109045A Withdrawn EP0103843A1 (fr) 1982-09-20 1983-09-13 Procédé de la préparation d'images colorées

Country Status (7)

Country Link
EP (1) EP0103843A1 (fr)
JP (1) JPS5977460A (fr)
AU (1) AU1922083A (fr)
BR (1) BR8305087A (fr)
DK (1) DK425883A (fr)
ES (1) ES8405963A1 (fr)
IL (1) IL69726A0 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4791450A (en) * 1985-12-16 1988-12-13 Eastman Kodak Company Multicolor electrophotographic reproduction apparatus and method for producing color accented copies
EP0370482A1 (fr) * 1988-11-25 1990-05-30 Ishihara Sangyo Kaisha, Ltd. Méthode électrophotographique en couleurs
US5194878A (en) * 1988-11-25 1993-03-16 Ishihara Sangyo Kaisha Ltd. Color electrophotographic method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1423793A (en) * 1973-02-05 1976-02-04 Hitachi Ltd Colour electrophotographic method
US4025339A (en) * 1974-01-18 1977-05-24 Coulter Information Systems, Inc. Electrophotographic film, method of making the same and photoconductive coating used therewith
US4105322A (en) * 1975-09-12 1978-08-08 Ricoh Company, Ltd. Electrophotographic color process
US4106870A (en) * 1973-12-28 1978-08-15 Canon Kabushiki Kaisha Color electrophotographic method and apparatus
GB1556080A (en) * 1976-01-19 1979-11-21 Xerox Corp Electrostatic reproduction machine
US4189224A (en) * 1977-10-13 1980-02-19 Ricoh Company, Ltd. Two color electrostatic copying machine
US4230783A (en) * 1977-06-17 1980-10-28 Canon Kabushiki Kaisha Process and apparatus for electrophotography
US4269919A (en) * 1976-07-13 1981-05-26 Coulter Systems Corporation Inorganic photoconductive coating, electrophotographic member and sputtering method of making the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1423793A (en) * 1973-02-05 1976-02-04 Hitachi Ltd Colour electrophotographic method
US4106870A (en) * 1973-12-28 1978-08-15 Canon Kabushiki Kaisha Color electrophotographic method and apparatus
US4025339A (en) * 1974-01-18 1977-05-24 Coulter Information Systems, Inc. Electrophotographic film, method of making the same and photoconductive coating used therewith
US4105322A (en) * 1975-09-12 1978-08-08 Ricoh Company, Ltd. Electrophotographic color process
GB1556080A (en) * 1976-01-19 1979-11-21 Xerox Corp Electrostatic reproduction machine
US4269919A (en) * 1976-07-13 1981-05-26 Coulter Systems Corporation Inorganic photoconductive coating, electrophotographic member and sputtering method of making the same
US4230783A (en) * 1977-06-17 1980-10-28 Canon Kabushiki Kaisha Process and apparatus for electrophotography
US4189224A (en) * 1977-10-13 1980-02-19 Ricoh Company, Ltd. Two color electrostatic copying machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4791450A (en) * 1985-12-16 1988-12-13 Eastman Kodak Company Multicolor electrophotographic reproduction apparatus and method for producing color accented copies
EP0370482A1 (fr) * 1988-11-25 1990-05-30 Ishihara Sangyo Kaisha, Ltd. Méthode électrophotographique en couleurs
US5194878A (en) * 1988-11-25 1993-03-16 Ishihara Sangyo Kaisha Ltd. Color electrophotographic method

Also Published As

Publication number Publication date
IL69726A0 (en) 1983-12-30
JPS5977460A (ja) 1984-05-02
DK425883D0 (da) 1983-09-19
ES525734A0 (es) 1984-06-16
BR8305087A (pt) 1984-05-08
DK425883A (da) 1984-03-21
AU1922083A (en) 1984-03-29
ES8405963A1 (es) 1984-06-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19841129

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Inventor name: KUEHNLE, MANFRED R.