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External toner additive, toner and image forming apparatus using the same

A technology of external additives and toners, applied in the field of imaging equipment, can solve the problems of uneven charging, impossible uniform charging of photosensitive drums, and decline in discharge performance, so as to prevent uneven charging, excellent fluidity and electrostatic charge performance Effect

Inactive Publication Date: 2009-01-14
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In these corona chargers, if some dust adheres to the tungsten wire, zigzag discharge electrode, etc., the discharge performance drops at that part, making it impossible to uniformly charge the photosensitive drum
If such charging unevenness occurs, image defects such as black bands and other defects appear in the resulting image

Method used

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  • External toner additive, toner and image forming apparatus using the same
  • External toner additive, toner and image forming apparatus using the same
  • External toner additive, toner and image forming apparatus using the same

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Embodiment Construction

[0034] Embodiments of the present invention will be described below with reference to these drawings.

[0035] figure 1to 4 show an example of an embodiment of the present invention. figure 1 is a sectional view schematically showing the structure of the image forming apparatus according to the present invention. Fig. 2 is a sectional view schematically showing the structure of a developing unit and a photosensitive drum. Fig. 3 is an exploded perspective view showing the structure of the sawtooth charger. Figure 4 is a block diagram showing one embodiment of an energy supply circuit including a high voltage circuit for supplying voltage to a corona charger. Figure 5 is an SEM photograph of the tip of a discharge electrode of a corona charger in which there is no accumulation when using the toner according to the present invention. Image 6 is an SEM photograph of the tip of a discharge electrode of a corona charger having buildup therein when the toner according to the p...

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Abstract

To provide a toner and an image forming apparatus using the toner, the toner contains an external additive that can suppress adherence of impurities to a discharge electrode of a corona discharger and prevent occurrence of charging unevenness. The external toner additive is comprised of a particulate metal oxide with trimethylsilyl groups introduced on the surface thereof, the volatile amount of trimethylsilanol being specified to be 0.25 mug or below based on a method for quantitative analysis of trimethylsilanol in the external additive. The toner of the present invention is specified such that the volatile amount of trimethylsilanol is specified to be 0.02 mug or below based on a method for quantitative analysis of trimethylsilanol in the toner.

Description

technical field [0001] The present invention relates to an external toner additive, a toner using the additive, and an image forming apparatus such as a copier, a printer, a facsimile, etc. having a printing function based on electrophotography using the toner. Background technique [0002] An image forming apparatus employing electrostatic electrophotography generally includes the steps of charging, exposing, developing, transferring, separating, cleaning, removing charge, and fixing. The step of forming an image is carried out by uniformly charging the surface of a rotationally driven photosensitive drum with a charging device, and then irradiating the charged photosensitive drum with a laser beam to form an electrostatic latent image. This electrostatic latent image on the photosensitive drum is developed by electrostatically attaching the toner to form a toner image on the surface of the photosensitive drum. The toner image on the photosensitive drum is transferred to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/09G03G15/00G03G15/02
CPCC09C1/3684C09C1/3081G03G9/09716G03G9/09725C01P2004/64C09C3/12C09C1/407B82Y30/00
Inventor 辻晓子井野利昭西村泰浩
Owner SHARP KK
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