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Image forming apparatus

An imaging device and an imaging device technology, which are applied to equipment, instruments, and developers using electric charge pattern recording technology, and can solve the problems of unstable halftone levels, significant unevenness of toner images, and reduced image quality, etc. question

Inactive Publication Date: 2009-07-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] As a result, a problem arises: image quality is significantly compromised by gloss differences between pixels in the output image
[0023] In addition, the height of the toner is approximately 5 to 10 μm at a portion having a high density, and thus, there arises a problem that the unevenness of the toner image is particularly conspicuous, which leads to a decrease in image quality
However, in this case, there arises a problem that the gradation of the halftone of the color toner is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0177] Carbolic acid: 3.6 parts by mass

[0178] Formalin solution (contains about 40% formaldehyde, about 10% methanol, and the rest is water): 5.4 parts by mass

[0179] With 1.0% by mass of γ-glycidoxypropyltrimethoxysilane (having an average particle size of 0.23 μm and 4×10 5 Resistivity of Ω·cm) Magnetite particles subjected to lipophilic treatment: 62.0 parts by mass

[0180] With 1.0% by mass of γ-glycidoxypropyltrimethoxysilane (having an average particle size of 0.57 μm and 2.2×10 9 Ω·cm resistivity) lipophilic treated α-Fe 2 o 3 Microparticles: 26.0 parts by mass

[0181] The slurry in the flask was injected with ammonia as a basic catalyst and water. The temperature of the mixture was raised to 85° C. over 40 minutes and maintained at this temperature while stirring and mixing the mixture, followed by reaction for 3 hours. Produces and cures phenolic resins. Then, the resultant was cooled, and the supernatant was removed after adding water. Rinse the sedime...

example 2

[0184] Coated carrier No. 2 was produced in the same manner as in carrier production example 1, except that the primer of the coating was removed, the amount of the coating agent was changed to 0.4%, and the amount of the coupling agent was changed to 0.01%. Table 1 shows the production method of the obtained coated carrier No. 1 and coated carrier No. 2.

[0185] Table 1

[0186]

[0187] (production of non-magnetic toner)

[0188] Non-magnetic toner production example 1

[0189] (A) Color toners (C, Y, M, and K toners)

[0190] 250 parts by mass of 0.1M Na 3 PO 4 The aqueous solution was charged with 405 parts by mass of ion-exchanged water, and the temperature of the mixture was increased to 60°C. Then, 40.0 parts by mass of 1.07M CaCl 2 An aqueous solution was gradually added to the resultant, thereby obtaining an aqueous medium comprising calcium phosphate salt.

[0191] Meanwhile, the following formulation was uniformly dispersed and mixed by an attritor (man...

example 3

[0245] In this example, as in the case of Example 1, the image was designed in such a way that the maximum loading amount at the time of color toner superposition would be 1.0 mg / cm 2 .

[0246] Non-magnetic toner No. 1 was used as color toners (C, M, Y, and K toners) and transparent toners (T toners). The carrier to be used in each color toner was obtained by sieving the coated carrier No. 2 with a sieve to have an average particle diameter of 25 μm. The carrier to be used in the transparent toner was obtained by changing the average particle diameter of the coated carrier No. 2 to 35 μm. 8 parts by mass of each toner and 92 parts by mass of the corresponding coating vehicle were weighed and mixed with a V-shaped mixer, and the mixture was defined as Developer C for the start. The developer is loaded into a station corresponding to the toner color of the image forming apparatus.

[0247] At this time, the triboelectricity of each of the color toners was -34 µC / g, and that ...

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PUM

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Abstract

An image forming apparatus comprising: a plurality of color toner image forming devices each developing an electrostatic image with a color toner to form a color toner image; a transparent toner image forming device using a transparent toner developing an electrostatic image to form a transparent toner image; a transfer device which superimposes and transfers the colored toner image and the transparent toner image onto a transfer medium; and a fixing device which superimposes the superimposed toner image The toner image is fixed on the transfer medium. The image forming operation performed by the transparent toner image forming means is controlled in such a manner that the height of the superimposed toner image fixed by the fixing means is substantially a constant value. The absolute value of the charge amount per unit weight of the transparent toner is smaller than the absolute value of the charge amount per unit weight of each color toner.

Description

technical field [0001] The present invention relates to an image forming apparatus which forms an electrostatic image on an image bearing member based on image data of an original by, for example, an electrophotographic printing method or an electrostatic recording method; The polar developer develops the electrostatic image to provide a toner image; transfers the toner image on a recording material; and fixes the image to provide a glossy color image. The present invention relates to image forming devices such as printers, copiers or facsimiles. Background technique [0002] FIG. 1 shows an example of a color image forming apparatus according to an electrophotographic printing method. The imaging apparatus of this example will be briefly described below based on FIG. 1 . [0003] The color electrophotographic image forming apparatus 100 of this example has five image forming portions P (Pa, Pb, Pc, Pd, and Pe) arranged parallel to each other in the horizontal direction. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/01G03G15/00G03G9/10G03G9/08
Inventor 小俣晴彦
Owner CANON KK