US3773417A - Method and apparatus for aperture controlled electrostatic image reproduction or constitution - Google Patents

Method and apparatus for aperture controlled electrostatic image reproduction or constitution Download PDF

Info

Publication number
US3773417A
US3773417A US3773417DA US3773417A US 3773417 A US3773417 A US 3773417A US 3773417D A US3773417D A US 3773417DA US 3773417 A US3773417 A US 3773417A
Authority
US
United States
Prior art keywords
layer
screen
camera
source
charging
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 - Lifetime
Application number
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
Priority to US77614668A priority Critical
Application filed by Electroprint Inc filed Critical Electroprint Inc
Priority to US16700771A priority
Application granted granted Critical
Publication of US3773417A publication Critical patent/US3773417A/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

Links

Images

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/05Apparatus for electrographic processes using a charge pattern for imagewise charging, e.g. photoconductive control screen, optically activated charging means
    • G03G15/051Apparatus 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00Inking and printing with a printer's forme
    • B41M1/12Stencil printing; Silk-screen printing
    • B41M1/125Stencil printing; Silk-screen printing using a field of force, e.g. an electrostatic field, or an electric current
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/22Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34Apparatus 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
    • G03G15/344Apparatus 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
    • G03G15/346Apparatus 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
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2217/00Details of electrographic processes using patterns other than charge patterns
    • G03G2217/0008Process where toner image is produced by controlling which part of the toner should move to the image- carrying member
    • G03G2217/0025Process 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

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. The invention further relates to apparatus and methods for constituting or reproducing images through the use of a multilayered screen consisting of an array of apertures. A propulsion field directs charged particles through the screen to a receiving medium preferably spaced at a distance from the screen. Charge distribution on the screen controls the flow of particles through the apertures, some of which are in effect blocked, partially blocked, unblocked, and enhanced, depending on the local charge level. Thus, it is possible to produce patterns of varying tone without contact with the printed or effected substrate.

Description

United States Patent Pressman et al.

Thomas D. Kittredge, South San Francisco, both of Calif.

[ Nov. 20, 1973 Mayo et al 355/16 X McFarlane 355/3 Primary ExaminerRobert P. Greiner Attorney-Wilfred G. Caldwell [73] Assignee: Electroprint, Inc., Palo Alto, Calif. methods relating to the field of electrostatics, and is [22] Filed, Jul 28 1971 concerned with electrostatic reproducing or constituty ing. Apertured screen means carry charge distribu- [21] Appl. No.: 167,007 tions in accordance with a pattern such that particles Related U S Application Data directed at the screen means pass therethrough under modulation c trol d' tated b the ttern. [62] Division of Ser. No. 776,146, Nov. 15, 1968, Pat. No. on C y pa 3,647,291 The invention further relates to apparatus and methods for constituting or reproducing images 52 us. c1. 355/3, 355/16, 96/1 R, through the use of a multi-layered Screen consisting of 96/12 an array of apertures. A propulsion field directs 51 Int. Cl G03g 15/00 charged Particles through the Screen receiving [58] Field or Search 355/3, 16, 17; medium Preferably Spaced at a distance from the 96/1 R, 12 screen. Charge distribution on the screen controls the flow of particles through the apertures, some of which [56] Reierences Cited are in effect blocked, partially blocked, unblocked, UNITED STATES PATENTS and enhanced, depending on the local charge level. Thus, it is possible to produce patterns of varying tone gag 2 55;3 2: 33 without contact with the printed or effected substrate. 3:185:05! 5 1965 Goffe 355 17 x 9 Claims, 68 Drawing Figures 6 5 420 fia- L- g g TIMER K SUBSTRATE TO BE PRINTED }AREA TO BE PRINTED- |5 SINGLE SIGN I iLgC i l j REA lll ACTUAL BLOCKED AREA 1. 1 l l l W PAWS FIGJ INSULATOR 2' CONDUCTOR HOLE FIGZ Pmmnuuuvzo ms 3773.417

sum 02 or 22 TONER SOURCE TRANSPARENT ELECTRODE lLLUMINATE 1 AND CHAK5E/' PRE- CORONA SPRAY Q PATENIEnnnveoms 3.773.417

saw 030; 22

6 PARTICLE DIRECHON ,9 FIGA- PAIENTEDnuvzo m5 3.773417 sum ouur 22 (9 PARTICLE PATHS PAIENIEUHUV20 I975 PHOTOSENSITIVE IOI MATERIAL HIGH STRENGTH INSULATOR CONDUCTOR FIGBQ HIGH RESISTIVITY MATERIAL PHOTOSENSITIVE MATERIAL CON DUCTOR THIN LAYER PHOTOSEN SI TI VE MATERIAL IN SULATOR GOV DUCTOR PAIENTEDNUV 20 I975 sum as or 22 Ill FIG.9

PAIENIEDMJVRO 1913 3.773417 SHEEI U80F 22 +EXIT APERTURE -v| OJIO 0. we I 0.090

. ENTRANCE APERTUREA i FIGII TRANSPARENT CONDUCTIVE COATING /TRAN$PARENT SUPPORT moroconnucroa- .m- CONIJU B FIGJZ TRANSPARENT INSULATOR cmacms voulcr SCREEN PAIEIIII-iIIIIIIIIzoIIIn 3.773.417

SHEET IOUF 22 POSITIVE PRINT NEGATIVE PRINT Pos. PART NEG. PART Pos. PART NEG. PART A c A c s c B c EC s.c. s.c.

NoNE NoNE FIG.4O

PosITIvE PARTIcLEs NEGATIVE PARTICLES VOLTAGE NEG. Pos. NEG. POS.

PRINTING PRINTING PRINTING PRINTING FIGJGQ PATENTEU HUV 20 I973 SHEET 180? 22 FIG-44 FIG-47 sum 19 0F 22 PATENTED NOV 20 I975 QMQOE

Claims (9)

1. An aperture controlled electrostatic camera comprising in combination a housing; a removable multi-layer apertured screen comprising at least a screen insulator layer overlying a screen conductive layer; optical means for introducing an image to the housing; and charging means for double charging the insulator layer with charges varying from at least one polarity to zero in accordance with the image to be reproduced; said charging means comprising a transparent conductive layer and a photoconductive layer interposed between the screen and the optical means; and terminals whereat a source of potential is adapted to be connected between the conductive layer of the screen and the transparent layer.
2. The camera of claim 1 wherein the optical means comprises a shutter and further comprising timer means for opening the shutter while connecting the source of potential.
3. The camera of claim 2 further comprising light means within the camera under control of the timer means and means for reversing the potential of said source under control of the timer means whereby the insulator layer may be charged from one polarity through zero to reverse polarity.
4. An aperture controlled electrostatic camera comprising in combination housing means; a removable multi-layer apertured screen comprising at least a screen photoconductive layer overlying a screen conductive layer; optical means for introducing an image to the housing; and charging means for double charging the photoconductive layer with charges varying from at least one polarity to zero in accordance with the image to be reproduced; said charging means comprising a transparent conductive layer and a transparent insulative layer interposed between the screen and the optical means; and terminals whereat a source of potential is adapted to be connected between the transparent conductive layer and the screen conductive layer.
5. The camera of claim 4 wherein the optical means comprises a shutter and further comprising timer means for opening the shutter while connecting the source of potential.
6. The camera of claim 5 further comprising light means within the camera under control of the timer means and means for reversing the potential of said source under control of the timer means whereby the photoconductive layer may be charged from one polarity through zero to reverse polarity.
7. An aperture controlled electrostatic camera comprising in combination a housing; a multi-layer apertured screen removably connected to the housing having a first electrically insulative layer and a conductive layer; optical means comprising lens and shutter means for focusing an image on the first layer of the screen; a transparent conductor and a further insulative layer adapted to be disposed between the screen and the optical means with the further layer in contact with the first layer; one of said first layer and further layer comprising a photoconductor with the other comprising a non-light sensitive insulative layer; means for opening and closing the shutter means; and means for charging the first layer at least when the shutter means is open to establish an electrostatic latent image on the fIrst layer.
8. The camera of claim 7 wherein the means for charging the first layer comprises a source of direct potential; and connections from the transparent conductor and the conductive layer respectively to opposite poles of said source.
9. The camera of claim 8 further comprising means for reversing said connections for charging the first layer oppositely; a source of light effective for shining light against the transparent conductor; and timer means connected to the means for opening and closing the shutter means, the source of light, and the reversing means to effect precharging of the first layer by applying the charging potential and actuating the source of light; and to effect establishing of an electrostatic latent image on said first layer by reversing said connections and opening the shutter means.
US3773417D 1968-11-15 1971-07-28 Method and apparatus for aperture controlled electrostatic image reproduction or constitution Expired - Lifetime US3773417A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US77614668A true 1968-11-15 1968-11-15
US16700771A true 1971-07-28 1971-07-28

Publications (1)

Publication Number Publication Date
US3773417A true US3773417A (en) 1973-11-20

Family

ID=26862768

Family Applications (1)

Application Number Title Priority Date Filing Date
US3773417D Expired - Lifetime US3773417A (en) 1968-11-15 1971-07-28 Method and apparatus for aperture controlled electrostatic image reproduction or constitution

Country Status (1)

Country Link
US (1) US3773417A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942980A (en) * 1974-07-16 1976-03-09 Addressograph-Multigraph Corporation Ion modulator device and method of using in positive and negative modes
US3964388A (en) * 1974-03-04 1976-06-22 The Carter's Ink Company Method and apparatus for high speed non-impact printing with shade-of-grey control
US3976484A (en) * 1973-05-23 1976-08-24 Canon Kabushiki Kaisha Screen electrophotographic process
JPS524307A (en) * 1975-06-24 1977-01-13 Sano Shigei Kk Suction apparatus for screen reinforcing agent squeezing out machine
US4072412A (en) * 1974-12-28 1978-02-07 Canon Kabushiki Kaisha Image transfer device
US4143965A (en) * 1974-04-23 1979-03-13 Canon Kabushiki Kaisha Electrophotography method utilizing a photoconductive screen
US4168164A (en) * 1976-07-08 1979-09-18 Konishiroku Photo Industry Co., Ltd. Screen process for forming electrostatic latent images
US4174215A (en) * 1973-05-23 1979-11-13 Canon Kabushiki Kaisha Electrophotographic screen
US4181423A (en) * 1973-10-29 1980-01-01 Electroprint, Inc. Electrostatic color printing systems and methods using modulated ion streams
US4332876A (en) * 1973-06-19 1982-06-01 Canon Kabushiki Kaisha Electrophotographic screen
US4337303A (en) * 1980-08-11 1982-06-29 Minnesota Mining And Manufacturing Company Transfer, encapsulating, and fixing of toner images
US5208093A (en) * 1991-03-29 1993-05-04 Minnesota Mining And Manufacturing Company Film construction for use in a plain paper copier
US5298309A (en) * 1991-11-05 1994-03-29 Minnesota Mining And Manufacturing Company Film construction for use in a plain paper copier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892391A (en) * 1952-11-08 1959-06-30 Haloid Xerox Inc Electrophotographic camera apparatus
US3000735A (en) * 1956-06-11 1961-09-19 Keller Daniel Franklin Method and apparatus for the reproduction of images
US3185051A (en) * 1962-10-16 1965-05-25 Xerox Corp Xerographic method
US3339469A (en) * 1962-08-06 1967-09-05 Sun Chemical Corp Electrostatic printing apparatus
US3645614A (en) * 1968-03-01 1972-02-29 Electroprint Inc Aperture-controlled electrostatic printing system employing ion projection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892391A (en) * 1952-11-08 1959-06-30 Haloid Xerox Inc Electrophotographic camera apparatus
US3000735A (en) * 1956-06-11 1961-09-19 Keller Daniel Franklin Method and apparatus for the reproduction of images
US3339469A (en) * 1962-08-06 1967-09-05 Sun Chemical Corp Electrostatic printing apparatus
US3185051A (en) * 1962-10-16 1965-05-25 Xerox Corp Xerographic method
US3645614A (en) * 1968-03-01 1972-02-29 Electroprint Inc Aperture-controlled electrostatic printing system employing ion projection

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4174215A (en) * 1973-05-23 1979-11-13 Canon Kabushiki Kaisha Electrophotographic screen
US3976484A (en) * 1973-05-23 1976-08-24 Canon Kabushiki Kaisha Screen electrophotographic process
US4340296A (en) * 1973-06-19 1982-07-20 Canon Kabushiki Kaisha Electrophotographic apparatus
US4332876A (en) * 1973-06-19 1982-06-01 Canon Kabushiki Kaisha Electrophotographic screen
US4181423A (en) * 1973-10-29 1980-01-01 Electroprint, Inc. Electrostatic color printing systems and methods using modulated ion streams
US3964388A (en) * 1974-03-04 1976-06-22 The Carter's Ink Company Method and apparatus for high speed non-impact printing with shade-of-grey control
US4143965A (en) * 1974-04-23 1979-03-13 Canon Kabushiki Kaisha Electrophotography method utilizing a photoconductive screen
US3942980A (en) * 1974-07-16 1976-03-09 Addressograph-Multigraph Corporation Ion modulator device and method of using in positive and negative modes
US4072412A (en) * 1974-12-28 1978-02-07 Canon Kabushiki Kaisha Image transfer device
JPS524307A (en) * 1975-06-24 1977-01-13 Sano Shigei Kk Suction apparatus for screen reinforcing agent squeezing out machine
US4168164A (en) * 1976-07-08 1979-09-18 Konishiroku Photo Industry Co., Ltd. Screen process for forming electrostatic latent images
US4337303A (en) * 1980-08-11 1982-06-29 Minnesota Mining And Manufacturing Company Transfer, encapsulating, and fixing of toner images
US5208093A (en) * 1991-03-29 1993-05-04 Minnesota Mining And Manufacturing Company Film construction for use in a plain paper copier
US5298309A (en) * 1991-11-05 1994-03-29 Minnesota Mining And Manufacturing Company Film construction for use in a plain paper copier

Similar Documents

Publication Publication Date Title
US4155093A (en) Method and apparatus for generating charged particles
EP0625731B1 (en) Image forming method
US2725304A (en) Process for developing an electrostatic latent image
US3893418A (en) Xerographic developing apparatus
US3674532A (en) Control for bias of magnetic brush and method
CA1171130A (en) Electrostatic printing apparatus
US3052213A (en) Electrostatic printer apparatus for printing with liquid ink
KR910004682B1 (en) Exposure control system for continuous tone electrophotographic film
EP0743572B1 (en) A device for direct electrostatic printing (DEP) comprising an intermediate image receiving member
US3782818A (en) System for reducing background developer deposition in an electrostatic copier
US5121144A (en) Method to eliminate cross coupling between blackness points at printers and a device to perform the method
US2839400A (en) Electrostatic printing
EP0572000B1 (en) Grey scale monocomponent nonmagnetic development system
US5867191A (en) Toner projection printer with means to reduce toner spreading
US3702483A (en) Color rendition method
US3257222A (en) Electrostatic recording method and apparatus using shaped electrodes
US3306193A (en) Electrostatic screen printing with magnetic conveyer and moving base electrode
US5030996A (en) Image forming apparatus with AC bias voltages for preventing developer mixture
EP0520799B1 (en) Cleanerless developing method using mono-component developer
JP2637285B2 (en) Printer equipment
KR20000005097A (en) Method and device to improve printing quality of image recording device
US5155541A (en) Single pass digital printer with black, white and 2-color capability
US5777576A (en) Apparatus and methods for non impact imaging and digital printing
CA1139360A (en) Method and apparatus for electrostatically charging a dielectric layer
US4761672A (en) Ramped developer biases

Legal Events

Date Code Title Description
AS Assignment

Owner name: MARKEM CORPORATION

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

Effective date: 19861231