Charged device and manufacturing method thereof, image forming apparatus and charged method

Abstract

The present invention provides a charging apparatus, an image forming apparatus, a charging method and a method for manufacturing the charging apparatus. A needle electrode is provided with a pointed section which faces a charge-target object, and a voltage to be applied to the needle electrode is set as so that 2<=(E2. S2) / (E1. S1)<=5 is satisfied, wherein an ionization area A1 indicates an area where ionization occurs to oxygen molecules in an atmosphere; a dissociation area A2 indicates an area where dissociation occurs to the oxygen molecules in the atmosphere (excluding the ionization area A1); E1 indicates an average electric field strength in the ionization area A1; E2 indicates an average electric field strength in the dissociation area A2; ; S1 indicates square measure of the ionization area A1 on a plane which includes a straight line connecting the needle electrode and the charge-target object so that a distance between the needle electrode and the charge-target object becomes a shortest distance; and S1 indicates square measure of the dissociation area A2 of the plane. Thus, the electric charging device is capable of carrying out charging which excels in charging uniformity, reduces products such as ozone and nitrogen oxide and stably continues for a long stretch of time.

Description

technical field [0001] The present invention relates to a charging device that rarely generates discharge products such as ozone and nitrogen oxides, has excellent charging uniformity, and can charge stably for a long period of time, a charging method, a method for manufacturing the charging device, and an image forming apparatus including the charging device. . Background technique [0002] Conventionally, in an image forming apparatus using electrophotography, a charging device for uniformly charging a photoreceptor, and a transfer device for electrostatically transferring a toner image formed on a photoreceptor or the like to recording paper or the like , a peeling device for peeling recording paper, etc. that are in electrostatic contact with a photoreceptor, etc., a charging device of a corona charging method is generally used. [0003] As a charging device of this corona charging method, a so-called non-grid electrode type charger, a so-called grid electrode type char...

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Problems solved by technology

[0009] However, in the technology of the above-mentioned Patent Document 2, although the amount of ozone generation can be reduced by reducing the discharge current, the amount of reduction of ozone is not enough, and about 1.0 ppm of ozone is generated.

[0010] In addition, in the technology of the above-mentioned Patent Document 2, discharge products, toner, paper powder, etc. adhere to the electrodes, and the tip of the electrodes is worn and deteriorated by the discharge energy, resulting in a problem of unstable discharge.

[0011] In addition, in the technology of the above-mentioned Patent Document 3, when the amount of ozone generation becomes more than a certain condition, the amount of ozone generation can be suppressed to a certain amount or less by switching the electrodes, but it is necessary to have two or more sets of electrodes and a mechanism for switching the electrodes. , ozone detection sensor, etc., which will lead to an increase in size and cost of the device

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