US3787876A - Aperture controlled electrostatic image reproduction - Google Patents

Aperture controlled electrostatic image reproduction Download PDF

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Publication number
US3787876A
US3787876A US00215511A US3787876DA US3787876A US 3787876 A US3787876 A US 3787876A US 00215511 A US00215511 A US 00215511A US 3787876D A US3787876D A US 3787876DA US 3787876 A US3787876 A US 3787876A
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US
United States
Prior art keywords
apertures
path
electric field
fields
along
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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 - Lifetime
Application number
US00215511A
Inventor
Gerald L Pressman
Thomas D Kittredge
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.)
Markem Imaje Corp
Original Assignee
Electroprint Inc
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 Electroprint Inc filed Critical Electroprint Inc
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Publication of US3787876A publication Critical patent/US3787876A/en
Assigned to MARKEM CORPORATION reassignment MARKEM CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). , EFFECTIVE: DEC. 30, 1986. Assignors: ELECTROPRINT, INC.,
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/05—Apparatus for electrographic processes using a charge pattern for imagewise charging, e.g. photoconductive control screen, optically activated charging means
    • G03G15/051—Apparatus for electrographic processes using a charge pattern for imagewise charging, e.g. photoconductive control screen, optically activated charging means by modulating an ion flow through a photoconductive screen onto which a charge image has been formed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • B41M1/125—Stencil printing; Silk-screen printing using a field of force, e.g. an electrostatic field, or an electric current
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/344—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array
    • G03G15/346—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by selectively transferring the powder to the recording medium, e.g. by using a LED array by modulating the powder through holes or a slit
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2217/00—Details of electrographic processes using patterns other than charge patterns
    • G03G2217/0008—Process where toner image is produced by controlling which part of the toner should move to the image- carrying member
    • G03G2217/0025—Process where toner image is produced by controlling which part of the toner should move to the image- carrying member where the toner starts moving from behind the electrode array, e.g. a mask of holes

Definitions

  • ABSTRACT basically comprises apparatus and methods relating to the field of electrostatics, and is concerned with electrostatic reproducing or constituting.
  • Apertured screen means carry charge distributions in accordance with a pattern such that particles directed at the screen means pass therethrough under modulation control dictated by the pattern.
  • SHEET 10 0F 22 POSITIVE PRINT NEGATIVE PRINT POS. PART NEG PART POS. PART NEG. PART A c A c B c B c C 5.0. s.c.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

The invention basically comprises apparatus and methods relating to the field of electrostatics, and is concerned with electrostatic reproducing or constituting. Apertured screen means carry charge distributions in accordance with a pattern such that particles directed at the screen means pass therethrough under modulation control dictated by the pattern.

Description

United States Patent 1191 Pressman et al.
[ APERTURE CONTROLLED ELECTROSTATIC IMAGE REPRODUCTION Inventors: Gerald L. Pressman, San Jose;
Thomas D. Kittredge, South San Francisco, both of Calif.
Assignee: Electroprint, Inc., Palo Alto, Calif.
Filed: Jan. 5, 1972 Appl. No.: 215,511
Related U.S. Application Data Division of Ser. No. 776,146, Nov. 15, 1968, Pat. No. 3,647,291.
U.S. c1. 346/74 P, 250/324, 355/16 1111. C1. G03g 5/04, 003 7/00 Field 61 Search 355/3, 16, 17; 118/637; 117/175; 101/010. 13; 96/14, 1.5, 1 R; 346/74 ES, 74 P; 250/324 References Cited 'UNITED STATES PATENTS 3,460,156 8/1969 Byrd 346/74 ES Jan. 22, 1974 3,339,469 9/1967 McFarlane, Jr 355/3 3,228,029 1/1966 McNaney 346/74 P 3,645,614 2/1972 McFarlane, Jr 355/3 3,582,206 6/1971 Burdige 346/74 ES 3,594,162 7/1971 Simm 346/74 ES 3,625,604 l2/l97l Pressman 355/3 3,277,818 10/1966 C0116 346/74 ES Pn'mary Examiner-Bernard Konick Assistant Examiner-Jay P. Lucas Attorney, Agent, or Firm-Wilfred G. Caldwell [57] ABSTRACT The invention basically comprises apparatus and methods relating to the field of electrostatics, and is concerned with electrostatic reproducing or constituting. Apertured screen means carry charge distributions in accordance with a pattern such that particles directed at the screen means pass therethrough under modulation control dictated by the pattern.
7 Claims, 66 rawiy l s f SuBsTRATE TO BE PmNT k l-AREA TO BE PRIN TED I:,)
- ACTUAL BLOCKED AREA FIGI INSULATOR 2| 1:51-11: 5! 553 V A i V 1'///,1 V 1 F 1 o h 25 23 OLE T CON DUC TOR PAn-immmzmm sum 02 0F 22 N E E R x 23 3 N W %O//% m m im fi TRANSPARENT ELECTRODE EEO X mm MY m T FlG PAIENIEUJANZPISH 3.781876 SHEET 03 0F 22 DIRECTION l @KPARTICLE l9 FIGA PAIEHIED 3.787. 876
saw an. nr 22 0.0965 0.1200 0.1200 0.0940 OHOO PARTICLE PATHS I9 F IG. 5
PAIENTED JAN 2 2 i974 SHEET DSUF 22 Fig PMENTEDJANFZWIM sum 07 or 22 PAIENTED 3. 787. 876
SHEET 10 0F 22 POSITIVE PRINT NEGATIVE PRINT POS. PART NEG PART POS. PART NEG. PART A c A c B c B c C 5.0. s.c.
NoNE NoNE E FI G .40
PosITIvE PARTICLES NEGATIVE PARTICLES VOLTAGE NEG. POS. NEG. POS.
PRINTING PRINTING PRINTING PRINTING PAIENIEDJANZMH sum 17 or 2 6m 0mm Em mm @YOE PAIENIED 3.787. 876
sum 18 or 22 FIGSI PAIENTEDJANZZIQH sum 1901- 2 am QC Om a

Claims (7)

1. Apparatus for controlling the flow of charged particles along a path comprising, charge supporting means, apertured for particle passage, interposed in said path; means for establishing a first electric field effective at the charge supporting means within the apertures thereof and so polarized as to prevent movement of particles along the path via the apertures; and electric field means for selectively, aperture by aperture, counteracting said first electric field by diminishing, cancelling, and partly and wholly reversing it within the apertures thereof to enable selective movement of charged particles along the path via selected apertures.
2. The apparatus of claim 1 wherein the magnitude of said counteracting electric field is greater than the magnitude of said first electric field.
3. The apparatus of claim 2 wherein the apertured means comprises a plurality of uniformly distributed apertures through a charge supportable layer for particle flow, and said fields are manifested as lines of force effective in said apertures selectively to aid and inhibit particle flow.
4. The apparatus of claim 2 further comprising a source of toner particles for flow along said path.
5. The apparatus of claim 2 further comprising a source of ions for flow along said path.
6. Apparatus for controlling the flow of electrostatically charged particles along a path comprising, apertured electrostatic modulator means in said path and characterized by insulation properties for supporting electrical charge distribution; means for uniformly establishing electric fields effective within the apertures of the modulator means and so polarized as to permit movement of particles of one sign along the path through the modulator means via said apertures; and electric field means effective at the modulator means for selectively manifesting oppositely polarized electric fields in said apertures to diminish, cancel, and reverse said first electric fields, aperture by aperture, to prevent movement of charged particles along the path via selected apertures.
7. The apparatus of claim 6 wherein said electric field means comprises means for establishing a second electric field having a polarity opposite from and a magnitude substantially twice the magnitude of said electric fields so as to counteract said fields, and means selectively discharging said fields.
US00215511A 1968-11-15 1972-01-05 Aperture controlled electrostatic image reproduction Expired - Lifetime US3787876A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77614668A 1968-11-15 1968-11-15
US21551172A 1972-01-05 1972-01-05

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US3787876A true US3787876A (en) 1974-01-22

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994000A (en) * 1975-05-27 1976-11-23 Xerox Corporation Device for electrostatographic reproduction of an optical image using a charge storage grid
US4005438A (en) * 1975-05-27 1977-01-25 Xerox Corporation Device with control grid for electrostatographic reproduction of an optical image
US4155093A (en) * 1977-08-12 1979-05-15 Dennison Manufacturing Company Method and apparatus for generating charged particles
US4160257A (en) * 1978-07-17 1979-07-03 Dennison Manufacturing Company Three electrode system in the generation of electrostatic images
US4338615A (en) * 1980-06-02 1982-07-06 Texas Instruments Incorporated Electrostatic printer having LED array write head
US6060709A (en) * 1997-12-31 2000-05-09 Verkuil; Roger L. Apparatus and method for depositing uniform charge on a thin oxide semiconductor wafer
US20060133859A1 (en) * 2002-11-27 2006-06-22 Taisuke Kamimura Developing device and image forming apparatus adopting the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228029A (en) * 1962-02-20 1966-01-04 Joseph T Mcnaney Facsimile data recording apparatus
US3277818A (en) * 1964-12-28 1966-10-11 Gen Micro Electronics Inc Electrostatic stencil apparatus for matrix printers
US3339469A (en) * 1962-08-06 1967-09-05 Sun Chemical Corp Electrostatic printing apparatus
US3460156A (en) * 1964-12-31 1969-08-05 Burroughs Corp Electrostatic print head and printing station
US3582206A (en) * 1968-03-01 1971-06-01 Electroprint Inc Ion projection aperture-controlled electrostatic printing system
US3594162A (en) * 1967-11-22 1971-07-20 Agfa Gevaert Ag Electrographic recording process with charging deflection
US3625604A (en) * 1967-10-06 1971-12-07 Electroprint Inc Aperture controlled electrostatic printing system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228029A (en) * 1962-02-20 1966-01-04 Joseph T Mcnaney Facsimile data recording apparatus
US3339469A (en) * 1962-08-06 1967-09-05 Sun Chemical Corp Electrostatic printing apparatus
US3277818A (en) * 1964-12-28 1966-10-11 Gen Micro Electronics Inc Electrostatic stencil apparatus for matrix printers
US3460156A (en) * 1964-12-31 1969-08-05 Burroughs Corp Electrostatic print head and printing station
US3625604A (en) * 1967-10-06 1971-12-07 Electroprint Inc Aperture controlled electrostatic printing system
US3594162A (en) * 1967-11-22 1971-07-20 Agfa Gevaert Ag Electrographic recording process with charging deflection
US3582206A (en) * 1968-03-01 1971-06-01 Electroprint Inc Ion projection aperture-controlled electrostatic printing system
US3645614A (en) * 1968-03-01 1972-02-29 Electroprint Inc Aperture-controlled electrostatic printing system employing ion projection

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994000A (en) * 1975-05-27 1976-11-23 Xerox Corporation Device for electrostatographic reproduction of an optical image using a charge storage grid
US4005438A (en) * 1975-05-27 1977-01-25 Xerox Corporation Device with control grid for electrostatographic reproduction of an optical image
US4155093A (en) * 1977-08-12 1979-05-15 Dennison Manufacturing Company Method and apparatus for generating charged particles
US4160257A (en) * 1978-07-17 1979-07-03 Dennison Manufacturing Company Three electrode system in the generation of electrostatic images
US4338615A (en) * 1980-06-02 1982-07-06 Texas Instruments Incorporated Electrostatic printer having LED array write head
US6060709A (en) * 1997-12-31 2000-05-09 Verkuil; Roger L. Apparatus and method for depositing uniform charge on a thin oxide semiconductor wafer
US20060133859A1 (en) * 2002-11-27 2006-06-22 Taisuke Kamimura Developing device and image forming apparatus adopting the same
US7283775B2 (en) * 2002-11-27 2007-10-16 Sharp Kabushiki Kaisha Developing device using specific charging unit for charging toner and image forming device adopting the same

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AS Assignment

Owner name: MARKEM CORPORATION

Free format text: MERGER;ASSIGNOR:ELECTROPRINT, INC.,;REEL/FRAME:004765/0682

Effective date: 19861231