EP0754986A1 - Dispositif de développement et appareil électrographique - Google Patents

Dispositif de développement et appareil électrographique Download PDF

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Publication number
EP0754986A1
EP0754986A1 EP96810465A EP96810465A EP0754986A1 EP 0754986 A1 EP0754986 A1 EP 0754986A1 EP 96810465 A EP96810465 A EP 96810465A EP 96810465 A EP96810465 A EP 96810465A EP 0754986 A1 EP0754986 A1 EP 0754986A1
Authority
EP
European Patent Office
Prior art keywords
developer
developer surface
voltage
toner
blade
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.)
Ceased
Application number
EP96810465A
Other languages
German (de)
English (en)
Inventor
Günther Jakob Dr. Peter
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.)
Pelikan Hardcopy Production AG
Original Assignee
Pelikan Produktions AG
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 Pelikan Produktions AG filed Critical Pelikan Produktions AG
Publication of EP0754986A1 publication Critical patent/EP0754986A1/fr
Ceased 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
    • G03G15/22—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
    • G03G15/348—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 using a stylus or a multi-styli array
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade
    • 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
    • G03G2215/08—Details of powder developing device not concerning the development directly
    • G03G2215/0855—Materials and manufacturing of the developing device
    • G03G2215/0866—Metering member
    • 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
    • G03G2217/0083—Process using a fixed electrode array behind a moving recording medium

Definitions

  • the toner now adheres electrostatically to the surface of the transport roller or additionally by means of a magnetic field if the toner can be magnetized or carries a permanent magnetic moment.
  • a suitably designed permanent magnet is then mounted inside the transport roller.
  • both the roller and the internal magnet can be rotated for transport.
  • excess toner is wiped off either purely mechanically or magnetically by a kind of blade 4. This results in a well-defined, thin layer of the toner.
  • FIG. 2 Due to the manufacturing process and other influencing factors, the magnetic moment, the mass and the electrical charge of the pigment particles and thus their adhesive force on the surface of the developer roller are subject to a distribution. In practice, a so-called development curve can be found, as shown in FIG. 2.
  • the current of the pigment particles detached from the developer surface and striking the information carrier or an intermediate store depends on the electric field strength at the location of the developer surface. This relationship with the electrical potential difference (voltage) between the developer surface and the information carrier is shown as a parameter in FIG Determine field strength at the location of the developer surface as voltage divided by the distance between the two surfaces in the case of homogeneous electric fields). Analogous to the behavior of a Geiger-Müller counter tube, four areas can be distinguished in FIG.
  • area II In area I one speaks of start-up behavior, area II is called a proportional area (here the applied voltage and the particle flow are proportional to each other), area III one is called the transition area and area IV is called the saturation area. Areas II and IV are particularly interesting for general use. In area II, the number of pigment particles striking the information carrier per unit of time and thus the resulting color tone could be directly controlled by the electrical voltage applied between the developer surface and the information carrier. In area IV, the hue could be controlled by the duration of the applied voltage.
  • the object of the present invention is to optimize the shape of the development curve. This object is achieved by the combination of features of the claims.
  • FIG. 4 shows the modified development curves of the device according to FIG. 3.
  • a developer roller 2 which is known per se, is rotatably mounted in a housing 1. Above the roller 2 there is a storage space 3 for toner. In operation, the roller 2 rotates in the direction of the arrow. In order to produce a defined toner layer on the roller 2, a knife 4 is arranged at a short distance from the roller 2. A second, counter-rotating developer roller 5 is arranged in the housing 1 parallel to the axis of the roller 2 and at a short distance from it. The smallest distance between the rollers 2, 5 is arranged in the direction of rotation of the roller 2 after the knife 4 but before the pressure zone 6 at the opening 7 of the housing 1.
  • a cleaning device 8 for mechanically wiping the toner off the roller 5, for example a felt strip.
  • Sliding contacts 9, 10 rest on the rollers 2, 5 on the inside or outside.
  • a DC voltage is applied between the rollers 2, 5 via a voltage source 11.
  • toner is developed from the roller 2 to the roller 5 at the narrowest point between the rollers 2, 5 and only those toner particles which adhere relatively weakly because, for example, they are weakly electrostatically charged. It is thereby achieved that the toner particles transported on the roller 2 to the development zone 6 have a predetermined minimum adhesive force on the roller 2 have.
  • the rollers 2, 5 can additionally contain magnetic cores (not shown).
  • FIG. 3 shows the device in use for contractographic reproduction.
  • an information carrier e.g. Paper 17 passed.
  • a plurality of printing electrodes 18 are arranged below the paper 17 opposite the printing zone 6. Only two of these electrodes 18 are visible in the illustration according to FIG. 3. The remaining electrodes are arranged offset in a predetermined pattern in the axial direction of the roller 2. The distance between roller 2 and paper 17 or electrodes 18 is exaggerated because of the better overview.
  • electrodes 18 can optionally be applied to one of two voltage sources 20, 21, one voltage being lower than the potential of roller 2 and the other higher than the voltage applied to roller 5 by voltage source 11.
  • the described embodiment ensures that the toner particles with low adhesive force are developed from the roller 2 onto the roller 5, so that only toner particles with a predetermined minimum adhesive force arrive at the roller 2 at the printing location 6.
  • the dashed area I of the original development curve is practically cut off.
  • This Operating mode is suitable if you want to work in proportional range II.
  • you want to work in the saturation range IV a higher voltage is applied to the roller 5, so that the development curve according to FIG. 4b results.
  • the areas I to III of the original development curve are cut off here.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
EP96810465A 1995-07-20 1996-07-15 Dispositif de développement et appareil électrographique Ceased EP0754986A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2136/95 1995-07-20
CH213695 1995-07-20

Publications (1)

Publication Number Publication Date
EP0754986A1 true EP0754986A1 (fr) 1997-01-22

Family

ID=4226719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810465A Ceased EP0754986A1 (fr) 1995-07-20 1996-07-15 Dispositif de développement et appareil électrographique

Country Status (2)

Country Link
US (1) US5793401A (fr)
EP (1) EP0754986A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6184911B1 (en) * 1998-06-03 2001-02-06 Thomas N. Tombs Apparatus and method for recording using an electrographic writer and an imaging web
US8234241B2 (en) * 2007-01-04 2012-07-31 International Business Machines Corporation Methods, systems, and computer program products for reducing database workload volume

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281622A (en) * 1977-03-14 1981-08-04 Fuji Photo Film Co., Ltd. Apparatus for developing electrostatic latent image
EP0055599A2 (fr) * 1980-12-24 1982-07-07 Fujitsu Limited Procédé direct de formation d'images et appareil d'impression électrostatique
JPS57196268A (en) * 1981-05-28 1982-12-02 Ricoh Co Ltd Transfer recording method
JPS5818657A (ja) * 1981-07-27 1983-02-03 Konishiroku Photo Ind Co Ltd 静電荷像現像装置
JPS58171975A (ja) * 1982-04-02 1983-10-08 Canon Inc 画像記録装置
JPS6162084A (ja) * 1984-09-04 1986-03-29 Fuji Xerox Co Ltd 現像装置
US4624559A (en) * 1981-10-20 1986-11-25 Konishiroku Photo Industry Co., Ltd. Developing method for electrostatic latent image
US5229825A (en) * 1991-12-02 1993-07-20 Eastman Kodak Company Magnetic brush laydown/pickup apparatus

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2101770C3 (de) * 1971-01-15 1979-04-12 Philips Patentverwaltung Gmbh, 2000 Hamburg Elektrographisches Aufzeichnungsverfahren und Vorrichtung zu seiner Durchführung
US4118710A (en) * 1975-12-23 1978-10-03 Ricoh Company, Ltd. Electrostatic printing apparatus comprising improved printing electrode head
JPS5614260A (en) * 1979-07-16 1981-02-12 Canon Inc Developing device
JPS62273590A (ja) * 1986-05-21 1987-11-27 Minolta Camera Co Ltd 現像装置
US5140373A (en) * 1987-02-13 1992-08-18 Minolta Camera Kabushiki Kaisha Electrostatic latent image developing apparatus with bristle height adjusting member
JPS6414050A (en) * 1987-07-08 1989-01-18 Hitachi Ltd Image recording apparatus and method
JPH02196669A (ja) * 1989-01-26 1990-08-03 Casio Electron Mfg Co Ltd 静電記録装置
JPH05333674A (ja) * 1992-06-03 1993-12-17 Matsushita Electric Ind Co Ltd 現像装置
EP0587422B1 (fr) * 1992-09-09 2002-11-20 Kabushiki Kaisha Toshiba Appareil de développement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281622A (en) * 1977-03-14 1981-08-04 Fuji Photo Film Co., Ltd. Apparatus for developing electrostatic latent image
EP0055599A2 (fr) * 1980-12-24 1982-07-07 Fujitsu Limited Procédé direct de formation d'images et appareil d'impression électrostatique
JPS57196268A (en) * 1981-05-28 1982-12-02 Ricoh Co Ltd Transfer recording method
JPS5818657A (ja) * 1981-07-27 1983-02-03 Konishiroku Photo Ind Co Ltd 静電荷像現像装置
US4624559A (en) * 1981-10-20 1986-11-25 Konishiroku Photo Industry Co., Ltd. Developing method for electrostatic latent image
JPS58171975A (ja) * 1982-04-02 1983-10-08 Canon Inc 画像記録装置
JPS6162084A (ja) * 1984-09-04 1986-03-29 Fuji Xerox Co Ltd 現像装置
US5229825A (en) * 1991-12-02 1993-07-20 Eastman Kodak Company Magnetic brush laydown/pickup apparatus

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 048 (P - 178) 24 February 1983 (1983-02-24) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 093 (P - 192) 19 April 1983 (1983-04-19) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 009 (M - 268) 14 January 1984 (1984-01-14) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 229 (P - 485) 8 August 1986 (1986-08-08) *

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US5793401A (en) 1998-08-11

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