Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/48—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography combined with other image registration layers or compositions; Special originals for reproduction by thermography
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
  • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
  • G03D13/002—Heat development apparatus, e.g. Kalvar
• • 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
  • G03G13/06—Developing
• • 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
• • 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
• • 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
  • G03G15/28—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 projection is obtained by line scanning
  • G03G15/30—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 projection is obtained by line scanning in which projection is formed on a drum
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G9/00—Developers
  • G03G9/08—Developers with toner particles
  • G03G9/09—Colouring agents for toner particles
  • G03G9/0926—Colouring agents for toner particles characterised by physical or chemical properties
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S101/00—Printing
  • Y10S101/37—Printing employing electrostatic force

Definitions

• the invention is based on the problem of providing a method and material which, using latent charge images in a dry process, enable development and if required fixing without the disadvantages of the known processes.
• This problem is solved in that the electrophotographic layer is exposed to a source of heat radiation and that a heat distribution corresponding to the latent image is produced in this layer and in that this layer is exposed to said heat radiation when in engagement with heat-reactive developing material, i.e. material which reacts or dissolves at a fixed temperature, whereby the material melts in accordance with the latent image and forms a visible image.
• heat-reactive developing material i.e. material which reacts or dissolves at a fixed temperature
• One feature of the invention lies in that the latent charge image of an electrophotographic layer has, in particular for heat rays of long wavelengths such as infrared rays, a (heat) conductivity different from that of the layer outside the image or without image representation.
• electrophotographic layer relates to materials which can ordinarily be used in electrophotographic processes.
• the coated backings which have been employed previously in electrophotographic processes can be used as the electrophotographic layer.
• developer materials in combination with a heatreactive material are provided on the electrophotographic sheet with the electrostatic latent image and are exposed to heat rays.
• the developer substances are arranged on a separate backing, which is first brought into contact with the electrophotographic layer after the production of the electrostatic image and then has the heat ray applied thereto.
• This contact is advantageously effected under pressure, the layer and the backing with the developer substances for example being pressed together in frame-like supports.
• the invention includes the provision of developer materials which, at a fixed temperature, carry out chemical and/or physical reactions in accordance with the dimensions of the electrostatic latent image.
• a known developer powder comprising pigment materials is uniformly distributed on the backing by means of a fusible means such as a wax or a low melting resin which may have a colophony base.
• a fusible means such as a wax or a low melting resin which may have a colophony base.
• the backing is exposed to a heat ray when the developer substance on the special backing has been brought in contact with the electrophotographic sheet in which the electrostatic latent image is located, the developer layer side of the special backing lying against the electrophotographic sheet.
• the heat ray is applied from the side of the electrophotographic sheet which latter in this manner acts as a selective heat filter.
• This process has the advantage that the fixing is carried out in the same step as the developing since the pigment particles of the developer which are set free in the region of the electrostatic latent image by liquification of the fusible substance are fused to the electrophotographic sheet.
• a visible image has been formed on the backing. This visible image corresponds to the latent image in the electrophotographic layer.
• the electrophotographic layer is separated from the backing which carries said visible image.
• An infra-red source is advantageously used for producing the heat ray. It is pointed out, however, that the rays from the heat source may have wavelengths between from the end of the visible light to and including the infrared region.
• the invention includes the use of developer substances on a special backing, whereby the developer substances are released by a heating effect at a fixed temperature, are transferred to the electrophotographic layer in accordance with the dimensions of the electrostatic latent image therein and are fixed on this layer.
• developer substances are used which under the effect of heat rays of a fixed temperature carry out a col-our change on the special backing for the developer substances and/or with materials on the electrophotographic layer.
• the developer material for carrying out this process contains, in one embodiment, pigment materials in uniform distribution in a fusible substance on a backing.
• fusible substances are used waxes, for example paraffin wax or ceresin wax, which are particularly stable and have, for example, a melting point between 60 and C.
• the invention includes as fusible substance resins having low melting points, for example of colophony basis.
• carbon black is advantageously used in the above embodiment.
• developer materials with accurately defined melting points and which have been previously used in electrophotographic processes, advantageously those powders being used which have the lowest possible melting point.
• the developer material may comprise a combination of substantially 15% carbon black and substantially 85% of so-called highest wax type S with a melting point of about 80 C. This developer material is applied to a paper, for example of low quality.
• the developer layer applied to the second backing has the composition quoted below.
• a backing which after exposureof the; photoconductive layer or the photoconductive layer backing, if this layer is arranged on a special backing, is exposed to heat rays while being pressed against the photoconductive layer or photoconductive layer backing.
• Special black dye IV is a product of Degussa containing 89% C, 1.1% H, .7% N, .3% S, and 8.9% 0.
• the wax type S is produced by a chrom acid oxidation of raw montan wax and is composed of- 80% by weight of wax acid and 15 to by weight of the original wax ester.
• the Emnlsifier 2106 is an organic substance emulsifiable in water and composed of a mixture of different polyglycol-ether as disclosed in the German patent specification No. 1,020,426.
• Special black dye IV is generally used for printing and copying inks, dye bands, carbon papers and lacquers, and
• the photoconductive layer is' advantageously sheet-shaped, being arranged on a special carrier or being self-supporting.
• second layer 'contains developi-ng materials which on being heated by infra-red rays carry out reactions according to the latent image and produce the'visible image in thesecond layer.
• the 1 second layer contains developer substances which on being heated by infra-red rays carry out reactions according to the latent image and produce the visible image in thesecond lay-en said second layer containing substances, which carry out a color change, at a fixed temperature and (react in dependence with the degree of heat transfer caused by the heat. conduction of the: electrophotographic layer.
• rays consists of rays 'in the region at the end of the visible light, including infra-red rays.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Fixing For Electrophotography (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Electrophotography Using Other Than Carlson'S Method (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7267176

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (1)

Citations (11)

Family Cites Families (1)

• 0
  • NL NL262411D patent/NL262411A/xx unknown
• 1960
  • 1960-03-18 DE DEL35669A patent/DE1186331B/de active Pending
• 1961
  • 1961-03-02 GB GB7682/61A patent/GB978811A/en not_active Expired
  • 1961-03-08 US US109767A patent/US3234018A/en not_active Expired - Lifetime
  • 1961-03-17 FR FR856009A patent/FR1284291A/fr not_active Expired
  • 1961-03-17 BE BE601484A patent/BE601484A/fr unknown
  • 1961-05-09 FR FR861304A patent/FR1299550A/fr not_active Expired

Patent Citations (11)

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