Charging device including power supply copmonent for supplying power to charging component

Abstract

A charging device for charging a component to be charged (2), comprising: a charging roller (1), which has a conductive rotating shaft; a conductive bearing (9), used to support the rotating shaft (1a); a contact part (14), which is in contact with a peripheral surface of said rotating shaft (1a), and is used to supply electric power to said rotating shaft (1a); a coil spring (10), which is used to connect said bearing (9) and said The contact part (14) is pressed to the rotating shaft (1a) to provide electric energy to the bearing (9) and the contact part (14); wherein the coil spring (10) includes a contact with the bearing (9 ) of a first spring portion (10a) and a second spring portion (10b) having a different diameter from said first spring portion and contacting said contact member (14).

Description

technical field [0001] The invention relates to a charging device having a charging member for charging a component, wherein the charging member can be placed in contact with a component to be charged. The invention also relates to a power supply unit for supplying power to a charging unit. Background technique [0002] As a device for charging (including discharging) the surface of an image bearing member (member to be charged) such as an electrophotographic photosensitive member, an electrostatic recording medium member, or the like in an image forming apparatus, many devices have been known. . Among these charging devices, it is preferable to select these charging devices using a so-called contact type charging system in which the power supply voltage is reduced, the ozone generation amount is reduced, and the power loss is reduced, in which The part to be charged is charged by bringing a charging part into contact with a part to be charged. Among these contact-type ch...

AI Technical Summary

Problems solved by technology

As a result, conductivity tends to become insufficient at the contact

In addition, during the assembly of parts other than the elastic electrode plate 11 into the device, the electrode plate 11 is liable to be permanently damaged, and since the charging roller 1 moves in its axial direction, there is a gap between the end surface 1g and the contact point. The contact pressure between 11a tends to become unstable

As a result, the electrical conductivity between the elastic contact point 11a and the metal core end surface 1g of the charging roller 1 tends to become insufficient.

[0012] In addition, when power is applied, the prior art structure in which the contact point 11a of the elastic electrode plate 11 is elastically in contact with the metal core end surface 1g of the charging roller 1 tends to generate unnecessary noise, and in order to prevent the occurrence of these unnecessary noises, Conductive lubricant must be applied to the contact between the two parts

Images