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Image forming apparatus

An image and voltage technology, which is applied in the field of electrophotographic image forming devices, can solve the problems of low setting accuracy, low AC component setting accuracy, and setting charged voltage, etc., to achieve suppression of excessive discharge, suppression of damage, and prevention of Effect of inflow leakage current

Active Publication Date: 2015-08-19
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In contrast, the image forming apparatus of Patent Document 1 initially sets the AC component of the charging voltage based on multiple measurement points, but then sets it based on the value measured in the printing process and the setting history. AC component of charged voltage, so its setting accuracy is low
Also, in the image forming apparatus of Patent Document 2, the measurement point at which the discharge to the photoreceptor is generated is set to only one point, and like the image forming apparatus of Patent Document 1, the setting accuracy of the AC component of the charging voltage is not high.
Therefore, in the image forming apparatuses of Patent Document 1 and Patent Document 2, when a photoreceptor having a thick photosensitive layer is used in the initial state, it is difficult to set an optimum charging voltage according to the state of use.

Method used

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no. 1 approach ＞

[0164] Referring to the drawings, an image forming apparatus according to a first embodiment of the present invention will be described below. Image 6 It is a figure showing the structure of the table stored in the memory in the image forming apparatus of this embodiment. Figure 7 as well as Figure 8 It is a timing chart showing the transition timing of the measurement voltage in the current value measurement for calculating the discharge start voltage. Figure 9 It is a graph showing the relationship between the measurement voltage and the measurement current value for explaining the calculation method of the discharge start voltage.

[0165] Such as Image 6 As shown, the image forming apparatus 1 according to the present embodiment stores in the memory 111 a table that stores the measuring voltage Vpp corresponding to the environmental value (the temperature inside the device, the humidity inside the device, etc.) in the main body 2 of the device. fixed table (first s...

no. 2 approach ＞

[0185] Referring to the drawings, an image forming apparatus according to a second embodiment of the present invention will be described below. Figure 12 It is a figure showing the structure of the table stored in the memory in the image forming apparatus of this embodiment. In addition, in this embodiment, the same components and operations as those in the first embodiment are assigned the same reference numerals, and detailed descriptions thereof are omitted.

[0186] Such as Figure 12 As shown, and the first embodiment (refer to Image 6 ) similarly, the image forming apparatus 1 of this embodiment stores in the memory 111 a measurement voltage setting table (first setting table) DT1, a discharge start voltage correction table (first correction table) DT2, a measurement voltage correction table (second correction table) DT3 and measurement voltage setting table (second setting table) DT4, and further store charging voltage correction table (third correction table) DT5, ...

no. 3 approach ＞

[0199] Referring to the drawings, an image forming apparatus according to a third embodiment of the present invention will be described below. Figure 16 It is a figure showing the structure of the table stored in the memory in the image forming apparatus of this embodiment. In addition, in this embodiment, the same components and operations as those in the first embodiment are assigned the same reference numerals, and detailed descriptions thereof are omitted.

[0200] Such as Image 6 As shown, and the first embodiment (refer to Image 6 ) similarly, the image forming apparatus 1 of this embodiment stores in the memory 111 a measurement voltage setting table (first setting table) DT1, a discharge start voltage correction table (first correction table) DT2, a measurement voltage correction table (second calibration table) DT3 and measurement voltage setting table (second setting table) DT4, and further store a measurement voltage setting table (third setting table) DT6, whi...

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Abstract

An image forming apparatus includes photoconductors. Electrifiers uniformly electrify surfaces of the photoconductors. A power source applies an electrifying voltage to the electrifiers. A current measurer measures alternating current caused to flow by application of AC voltage by the power source. A controller calculates discharge starting voltage. Environment detectors detect an environment inside of the apparatus. The controller operates the current measurer at each predetermined timing to acquire the discharge starting voltage. When acquiring the discharge starting voltage, the controller changes peak-to-peak voltage at pre-discharge voltage and at post-discharge voltage. The current measurer measures alternating current at measurement points of each of the pre-discharge and post-discharge voltages. The controller calculates a voltage value at an intersection of a first line and a second line. After acquiring the discharge starting voltage, the controller calculates environment-correction discharge starting voltage, and sets electrification voltage based on the calculated voltage.

Description

technical field [0001] The present invention relates to an electrophotographic image forming apparatus that transfers a developer such as toner to recording paper, and more particularly, to an image forming apparatus including a photoreceptor on which an electrostatic latent image is formed as an image carrier. Background technique [0002] Conventionally, an electrophotographic image forming apparatus has a charger for charging the surface of a photoreceptor. As the charger, there is, for example, a charger of a contact charging method such as a roller type or a blade type. Furthermore, there are chargers that apply superimposed direct current and alternating current charging voltages to such contact charging type chargers. In addition, hereinafter, not only chargers that are in direct contact but also chargers that are placed very close to each other without contact are referred to as contact chargers. [0003] In a contact-type charger, an AC voltage is applied to gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00
CPCG03G15/80G03G15/0266G03G15/0283G03G21/20
Inventor 村内淳二长田守夫小堀一树北田朋
Owner KONICA MINOLTA INC
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