摘要:
Disclosed is a charging roller for an image forming apparatus capable of preventing the formations of surface scratches. The charging roller includes a roller shaft, a roller body formed on the roller shaft and a scratch prevention layer formed on the roller body. The scratch prevention layer contains inorganic crystal of polysilicate.
摘要:
A developing apparatus usable with an image forming apparatus includes a developer cartridge having an outlet through which developer is discharged, a developing cartridge, in which the developer cartridge is detachably disposed, has an inlet, through which the developer discharged from the outlet of the developer cartridge enters, and a connecting member connecting the outlet of the developer cartridge and the inlet of the developing cartridge so that the developer is supplied from the developer cartridge to the developing cartridge, wherein through the arrangement of the developer cartridge, the developing cartridge and the connecting member, the flow of developer from the developer cartridge to the developing cartridge is regulated based on the developer pressure in the developing cartridge.
摘要:
An electrophotographic color image forming apparatus, having: a plurality of photosensitive media; a plurality of transfer rollers respectively facing the plurality of photosensitive media; and a belt disposed between the photosensitive media and the transfer rollers and circulating while forming a plurality of transfer nips. When a length of the belt between two neighboring transfer nips is B and a distance between a pair of neighboring photosensitive media is C, B is larger than C, and when respective virtual lines connecting centers of the pair of photosensitive media and centers of corresponding transfer rollers are TP lines and a virtual line connecting the centers of the pair of neighboring photosensitive media is PP line, a pair of neighboring TP lines do not cross the PP line at right angles, and are slanted toward the same side to cross the PP line.
摘要:
A non-magnetic one-constituent developing agent is an electro-photographic developing agent that provides high quality images without fogging, scattering of toners and ineffective development by maintaining stable charges and a uniform distribution of toners over an extended lifetime in a developing apparatus of an electro-photographic image processing device. In addition, the developing agent has deodorizing, anti-bacterial and sterilizing functions.
摘要:
A toner having toner particles containing a binder resin and a colorant; and a first external additive having 0.1 to 3.0 wt % of large silica particles with an average particle size of 20 to 200 nm; a second external additive having 0.1 to 3.0 wt % of small silica particles with an average particle size of 5 to 20 nm; a third external additive having 0.1 to 2.0 wt % of hydrophobic titanium dioxide microparticles with a resistance of 105 to 1012 Ωcm; and a fourth external additive having at least one of 0.1 to 2.0 wt % of conductive titanium dioxide particles with a resistance of 1 to 105 Ωcm and 0.1 to 2.0 wt % of positively chargeable aluminum oxide particles. Therefore, a thin toner layer with a uniform toner amount is formed on a toner carrier and stable charge distribution and toner flowability are maintained for a long time, thereby resulting in prevention of fog and toner scattering, and improvements in developing efficiency and toner durability.
摘要:
A charging device charging a photosensitive medium of an image formation apparatus while being in contact with the photosensitive medium, supports both ends of a charging member having a plate-shaped elastic member by a support member, so that the charging member has a semicircular section. A curved surface of the charging member contacts a surface of the photosensitive medium to maintain a predetermined contact nip and a contact linear pressure. The charging device controls a total resistance by adjusting a material, a thickness, a contact area, and a radius of the charging member, and maintains the contact linear pressure and the contact nip from the photosensitive medium. As a result, the charging device can easily adjust an electric resistance, minimizing variations of the contact linear pressure and the contact nip, material and processing expenses can be cut down, and productivity of the charging device is improved.
摘要:
A multicolor image forming apparatus includes a plurality of developing units and a development power supply unit. Each of the developing units includes a developing roller located at a development gap from a photosensitive body, deposits toner accommodated therein on a surface of the developing roller, and supplies the toner to the photosensitive body across the development gap. The development power supply unit applies a development bias voltage to developing rollers of the developing units, the developing bias voltage being a rectangular AC bias voltage in which a forward bias voltage and a reverse bias voltage alternate. A percentage of toner particles of the toner having diameter-charge amounts greater than a contamination limit diameter-charge amount of a toner particle is less than 5%.
摘要:
An electrophotographic color image forming apparatus, having: a plurality of photosensitive media; a plurality of transfer rollers respectively facing the plurality of photosensitive media; and a belt disposed between the photosensitive media and the transfer rollers and circulating while forming a plurality of transfer nips. When a length of the belt between two neighboring transfer nips is B and a distance between a pair of neighboring photosensitive media is C, B is larger than C, and when respective virtual lines connecting centers of the pair of photosensitive media and centers of corresponding transfer rollers are TP lines and a virtual line connecting the centers of the pair of neighboring photosensitive media is PP line, a pair of neighboring TP lines do not cross the PP line at right angles, and are slanted toward the same side to cross the PP line.
摘要:
A toner of an electrophotographic imaging apparatus includes a binder resin, a coloring agent, a mold release agent, a charge control agent, and external additives, and is characterized in that the external additives include silica particles having a polarity counter to a polarity of the toner, silica particles having a same polarity as the polarity of the toner, titanium oxide particles having a same polarity as the polarity of the toner, and strontium titanate particles having a same polarity as the polarity of the toner. A uniform image density may be obtained even though the number of printed pages is increased, as well as at the beginning of printing, and particularly, poor image development such as fog, etc. can be prevented by use of the above toner for an electrophotographic imaging apparatus.
摘要:
A non-magnetic one-constituent developing agent is an electro-photographic developing agent that provides high quality images without fogging, scattering of toners and ineffective development by maintaining stable charges and a uniform distribution of toners over an extended lifetime in a developing apparatus of an electro-photographic image processing device. In addition, the developing agent has deodorizing, anti-bacterial and sterilizing functions.