Image forming apparatus and image forming method

Abstract
An image forming apparatus includes: an image holding member; a toner image formation device that forms a toner image using a toner, the toner including a first component and a second component that are present separately from each other and form a color when they are reacted with each other, and a photocurable composition containing either one of the first component and the second component, the photocurable composition being cured or maintained in an uncured state by applying color forming information, to control the reaction for color formation; a color forming information applying device; a transfer device; a fixing device; and a color formation device.
Description

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described based on the following figures, wherein:



FIG. 1 is a schematic block diagram showing an example of an image forming apparatus of an aspect of the present invention;



FIG. 2 is a schematic cross-sectional view showing a state where light for applying color forming information is exposed to a toner image;



FIG. 3 is a circuit block diagram of a print control unit;



FIG. 4 is a schematic block diagram showing another example of the image forming apparatus of an aspect of the present invention;



FIGS. 5A and 5B are schematic diagrams for describing the mechanism of color formation of the toner, wherein FIG. 5A shows a color forming part and FIG. 5B shows an enlarged view thereof:



FIG. 6 is a schematic cross-sectional view showing an example of the toner structure (containing a parent material and a color forming part dispersed in the parent material);



FIG. 7 is a schematic cross-sectional view showing another example of the toner structure (concentric circle structure);



FIG. 8 is a schematic cross-sectional view showing another example of the toner structure (stripe structure); and



FIG. 9 is a schematic cross-sectional view showing another example of the toner structure (fan structure).


Claims
  • 1. An image forming apparatus comprising: an image holding member; a toner image formation device that forms a toner image on a surface of the image holding member using a toner, the toner including a first component and a second component that are present separately from each other and form a color when reacted with each other, and a photocurable composition containing either one of the first component and the second component, the photocurable composition being cured or maintained in an uncured state by applying color forming information, to control the reaction for color formation; a transfer device that transfers the toner image formed on the image holding member surface onto a recording medium surface; a color forming information applying device that applies color forming information to the toner image; a fixing device that fixes the toner image transferred onto the recording medium surface; and a color formation device that forms a color of the toner image applied with the color forming information.
  • 2. The image forming apparatus according to claim 1, wherein the fixing device also functions as the color formation device.
  • 3. The image forming apparatus according to claim 1, wherein the image holding member is a photoreceptor, and the toner image formation device includes: a charging device that charges a surface of the photoreceptor; an exposure device that forms an electrostatic latent image on the surface of the photoreceptor by exposing the photoreceptor to light; and a development device that develops the electrostatic latent image using a developing agent containing the toner and forms a toner image.
  • 4. The image forming apparatus according to claim 1, further comprising a photo irradiation device that irradiates light onto the recording medium surface that the toner image has been fixed on.
  • 5. The image forming apparatus according to claim 1, wherein the image holding member is provided with a reflection device that reflects the light for applying the color forming information to the toner image formed on the image holding member surface toward the toner image again.
  • 6. The image forming apparatus according to claim 1, wherein the toner contains a microcapsule dispersed in the photocurable composition, the first component is contained in the microcapsule, and the second component is included in the photocurable composition.
  • 7. The image forming apparatus according to claim 6, wherein the photocurable composition contains the second component and a polymerizable compound.
  • 8. The image forming apparatus according to claim 6, wherein the second component contains a photopolymerizable group.
  • 9. An image forming method comprising: forming a toner image on an image holding member surface using a toner, the toner having a first component and a second component that are present separately from each other and form a color when reacted with each other, and a photocurable composition containing either one of the first component and the second component, the photocurable composition being cured or maintained in an uncured state by applying color forming information, to control the reaction for color formation; transferring the toner image onto a recording medium surface; applying color forming information to the toner image; fixing the toner image transferred onto the recording medium surface; and forming a color of the toner image that the color forming information has been applied to.
  • 10. The image forming method according to claim 9, wherein the application of color forming information is provided between the forming of the toner image and the transferring the toner image.
  • 11. A toner comprising a color former, and a photocurable developer monomer that reacts with the color former to form a color.
  • 12. The toner according to claim 11, wherein the color former and the photocurable developmer monomer are present separate from each other in the toner, and when a polymer is formed by photopolymerization of the photocurable developer monomer, the polymer is contained in the toner so as not to react with the color former.
  • 13. The toner according to claim 11, wherein the color former and/or the photocurable developer monomer are contained in microcapsules, and a polymer formed by photopolymerization of the photocurable developmer monomer does not pass through walls of the microcapsules.
  • 14. The toner according to claim 11, wherein the color former is selected from an electron donating colorless dye or a diazonium salt compound, and the photocurable developer monomer is selected from an electron accepting compound or a coupler compound including a photopolymerizable group.
  • 15. The toner according to claim 14, wherein the color former is an electron donating colorless dye, and the amount of the electron donating colorless dye in a color forming part of the toner is about 0.01 to 3 g/m2.
  • 16. The toner according to claim 14, wherein the color former is an electron donating colorless dye, the photocurable developer monomer is a coupler compound including a photopolymerizable group, and the content of the coupler compound including a photopolymerizale group is about 0.5 to 20 parts by mass relative to the electron donating colorless dye.
  • 17. The toner according to claim 14, wherein the color former is a diazonium salt compound, and the amount of the diazonium salt compound in a color forming part of the toner is about 0.01 to 3 g/m2.
  • 18. The toner according to claim 14, wherein the color former is a diazonium salt compound, the photocurable developer monomer is a coupler compound including a photopolymerizable group, and the content of the diazonium salt compound is about 0.5 to 20 parts by mass relative to the coupler compound including a polymerizable group.
  • 19. The toner according to claim 11, further comprising a spectral sensitizing dye and a borate compound, a ratio of contents of the spectral sensitizing dye to the borate compound (spectral sensitizing dye:borate compound) being about 1:1 to 1:50.
  • 20. The toner according to claim 11, wherein a volume average particle size distribution index GSDv is about 1.30 or less, a ratio of a volume average particle size distribution index GSDv to a number average particle size distribution index GSDp (GSDv/GSDp) is about 0.95 or more, and a shape factor SF1 is about 110 to 130.
  • 21. A toner comprising a color former, a developer that reacts with the color former to form a color, and a photopolymerizable monomer.
  • 22. The toner according to claim 21, wherein the color former and the developer are present separate from each other in the toner, the color former and the developer react to form the color by photopolymerization of the photopolymerizable monomer to form a polymer.
  • 23. The toner according to claim 21, the color former and/or the developer are contained in microcapsules.
  • 24. The toner according to claim 22, the photopolymerizable monomer comprises a decoloring reaction group that inhibits the color former and the developer from reacting to form the color.
  • 25. The toner according to claim 21, wherein the color former is a polymerizable compound including an ethylenically unsaturated bond, and the developer is selected from a phenol compound, an organic carboxylic acid compound or a metal salt thereof, a sulfonic acid compound, a urea or thio urea compound, acid clay, bentonite, a novolac resin, or a metal complex.
  • 26. The toner according to claim 21, further comprising a thermal polymerization inhibitor.
  • 27. The toner according to claim 21, wherein a volume average particle size distribution index GSDv is about 1.30 or less, a ratio of a volume average particle size distribution index GSDv to a number average particle size distribution index GSDp (GSDv/GSDp) is about 0.95 or more, and a shape factor SF1 is about 110 to 130.
Priority Claims (1)
Number Date Country Kind
2006-077360 Mar 2006 JP national