Image forming device and image carrier assembly
An image carrier and image technology, which is applied in the field of image forming devices and image carrier components, can solve problems such as poor charging and low charging performance, and achieve the effect of reducing wear and damage
Inactive Publication Date: 2005-12-07
RICOH KK
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Problems solved by technology
In this way, the remaining toner on the photoreceptor will be transferred to the effective charging width of the charging roller, which will cause poor charging due to contamination.
[0011] In addition, even if the charging member and the photoreceptor are not in contact with the image forming area, the surface of the charging member and the photoreceptor has fine unevenness, that is, there is an unavoidable flatness in the axial machining accuracy (the distance from the bottom of the concave portion to the convex portion The value indicated by the height of the top, when the object is flat, it becomes a problem of flatness), therefore, sometimes the contact between the charged part and the surface of the photoreceptor is caused by the flatness or flatness of them
[0012] In that case, even if it is a non-contact charging device, when the surface of the charged part is mostly in contact with the surface of the carrier, the dirt attached to the surface of the carrier will be transferred to the surface of the charged part, which will reduce the charging performance. low
Method used
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Embodiment Construction
[0089] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0090] figure 1 is a schematic diagram of a charging roller and a photoreceptor drum provided in the image forming apparatus according to the first embodiment of the present invention, figure 2 is an enlarged view of one end side of the charging roller, image 3 It is an overall configuration diagram of a color compact printer as the image forming apparatus.
[0091] image 3 The color compact printer shown as an image forming device is a four-drum full-color electrophotographic image forming device, and four photoreceptor assemblies 2A, 2B, 2C, and 2D as image carrier assemblies are housed in the device body 1. Can be attached and detached relative to the device body 1 respectively.
[0092] In the approximate center of the device body 1 of the small printer, three transfer belts are mounted on several rollers, which can rotate in the direction A ...
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The present invention relates to an image forming device and an image carrier assembly in the same. An electrifying roller 14 is brought into contact with the coating part 61 of the drum 5 through a tape members 18, and a gap G is formed between the electrification effective width Wac of the roller and the surface of the drum. Thus, the wear or the damage of the member is made smaller than in the case the member is brought into contact with a non-coating part 62 formed of harder material than the coating part 61. Even though the thickness of the member is set to <=100 mum, the member is not worn drastically. The gap G is greater than the sum of an axial flatness D of the surface of the drum and an axial flatness E of the surface of the electrifying roller. So that the electrification effective width Wac of the roller is prevented from coming into contact with the drum. The electrification performance is prevented from lowering and the good image is gained.
Description
technical field [0001] The present invention relates to an image forming apparatus provided with an image carrier and a charging device, and an image carrier assembly incorporated in the image forming apparatus. The image carrier includes a coated portion for forming a photosensitive layer and A non-coated portion formed of a material harder than the coated portion, the above-mentioned charging device includes a charging member that charges the coated portion of the image carrier, and the image area portion of the charging member is opposed to the charged surface of the image carrier They are placed close to each other to form a predetermined gap, and a voltage is applied between the charging member and the image carrier to charge the above-mentioned charged surface. Background technique [0002] Conventionally, there is a non-contact charging device in which the portion of the charging member forming an image area, that is, the effective charging width portion, is placed cl...
Claims
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IPC IPC(8): G03G15/02
Inventor 藤城宇贡平松正巳佐藤真澄石桥均吉永洋岩崎有贵子
Owner RICOH KK