Charged roller
A charging roller and electrical conductivity technology, applied in the field of charging rollers, can solve the problems of reduced charging characteristics, easy residual toner, poor images, etc., and achieve the effect of maintaining charging characteristics and long-term charging characteristics
Active Publication Date: 2011-04-27
SYNZTEC
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AI Technical Summary
Problems solved by technology
[0003] However, the conventional charging roller has the problem that the photoreceptor tends to retain toner or adhere to external additives.
If it is easy to adhere to external additives, etc., long-term use will cause a large amount of external additives to adhere, and the resistance value will change or deviate, and the charging characteristics will decrease.
Decreased charging characteristics lead to image defects in image forming apparatuses
Method used
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preparation example Construction
[0089]
[0090]Add 0.5 parts by mass of sodium trifluoroacetate as a conductivity imparting agent, 3 parts by mass of zinc white, 2 parts by mass of stearic acid, 1.5 Parts by mass of vulcanizing agent were kneaded with a roll mixer, and press-molded on the surface of a mandrel with a diameter of 6 mm to obtain a roll with an elastic layer formed on the surface of the mandrel.
[0091]
[0092] Grind the roller with a grinder, and use the figure 2 The device shown performs wet grinding to form asperities extending in the circumferential direction such that the surface roughness is greater in the axial direction than in the circumferential direction.
[0093]
[0094] 100 parts by mass of ethyl acetate and 20 parts by mass of an isocyanate compound (MDI) were dispersed and mixed for 3 hours with a ball mill.
[0095]
[0096] The above-mentioned roller was dipped for 30 seconds with the surface treatment liquid kept at 20° C., and then heated in an oven kept at 100° C...
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The invention relates to a charged roller. The invention provides the charged roller capable of maintaining the charge characteristic for a long time. The outer periphery of a spindle of the charged roller is provided with at least one conductive rubber elastic layer. The average roughness of ten points of the charged roller in the axial direction is Rz1, the average roughness of ten points of the charged roller in the circumferential direction is Rz2, the average distance between concave and convex parts of the charged roller in the axial direction is Sm1, and the average distance between concave and convex parts of the charged roller in the circumferential direction is Sm2. The surface state of the charged roller satisfies the following formula, and the microhardness of the charged roller is 48-60 DEG. In the formula [1], 1.00<Rz1 / Rz2<=2.00, 0<Sm1 / Sm2<=1.00, and 11Mum<Rz1.
Description
technical field [0001] The present invention relates to a charging roller used for imparting uniform static electricity to a photoreceptor or the like of an image forming apparatus such as an electrophotographic copier and a printer, or an inkjet copier and a printer. Background technique [0002] The charging rollers used in image forming devices such as electrophotographic copiers and printers are required to have predetermined conductivity in addition to the property of not contaminating photoreceptors and the like. [0003] However, the conventional charging roller has a problem that toner remains on the photoreceptor and external additives tend to adhere. If the external additives and the like tend to adhere, a large amount of the external additives and the like will adhere to them after long-term use, resulting in a change in resistance value or variation thereof, and a reduction in charging characteristics. The reduction in charging characteristics leads to image def...
Claims
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IPC IPC(8): G03G15/02
Inventor 大浦孝祐
Owner SYNZTEC