摘要:
A developing apparatus includes an image receptor and a developing unit having a developing roller facing the image receptor. New toner can be added to the developing unit when existing toner in the developing unit is consumed. The added toner and existing toners are formed of cores and external additives. At least one of the cores or the external additives of the added toner is different from that of the existing toner. When the charge amount of the two toners are Q1 and Q2, respectively, the ratio Q1/Q2 is greater than 0.6 and smaller than 1.7, and the absolute values of Q1 and Q2 are 10 μC/g or greater, respectively.
摘要:
An electrophotographic image forming apparatus is provided which includes an image receptor on which an electrostatic latent image is formed. A developing unit develops the electrostatic latent image by supplying non-magnetic mono-component toner to the electrostatic latent image and includes a developing roller which faces the image receptor. A trail type regulating blade is installed to form a uniform toner layer on the developing roller. In the electrophotographic image forming apparatus, the rate of the amount of toner particles having a diameter of not more than about half of a median value of a volume-diameter distribution of the toner is not more than about 15% in a number-diameter distribution.
摘要:
A toner composition and a method of preparing the same provide a toner composition that includes a coloring agent, a charge control agent, a binder, a wax and an internal additive, wherein the coloring agent and wax are contained as a master batch, and the internal additive includes toner particles having at least one component selected from a hydrophobic silica, a hydrophobic titanium oxide and/or a hydrophobic aluminain e.g., an electrophotographic imaging apparatus. A toner composition has an enhanced pulverizing property obtained by preparing the toner composition by a pulverizing method, wherein charges are readily controlled, the durability of the final toner composition is significant, and the images have an improved quality, permitting printing of a significant number of copies thereof,
摘要:
A photoconductor is disclosed, which comprises a conductive cylindrical support which is substantially not hollowed, the conductive cylindrical support having a drive transferring mechanism coaxially and unifiedly provided on at least one of the end portions thereof, the conductive cylindrical support having a photoconductive layer on the outer periphery. The moment of inertia I (g . cm.sup.2) of the substantially not-hollowed conductive support is in the range of 0.4.ltoreq.I.ltoreq.140 (g . cm.sub.2), the diameter thereof being in the range from 0.5 to 2.0 cm. When the relation of C/(S . .omega.).ltoreq.0.4 (where S (cm.sup.2) is the square measure of the portion of the photoconductive layer on the photoconductor; C (cal/.degree.C.) is the heat capacity of the substantially not-hollowed cylindrical support; and .omega. (rad/s) is the rotating speed in development) is satisfied, high quality images can be readily and stably obtained without damages of the drive system.
摘要:
An electrophotographic image forming apparatus is provided which includes an image receptor on which an electrostatic latent image is formed. A developing unit develops the electrostatic latent image by supplying non-magnetic mono-component toner to the electrostatic latent image and includes a developing roller which faces the image receptor. A trail type regulating blade is installed to form a uniform toner layer on the developing roller. In the electrophotographic image forming apparatus, the rate of the amount of toner particles having a diameter of not more than about half of a median value of a volume-diameter distribution of the toner is not more than about 15% in a number-diameter distribution.
摘要:
A toner prepared using a master batch of a wax and a colorant such that it has an excellent dispersion of colorant and wax, a high concentration, a good color development and a broad range of color reproducibility. By performing a non-magnetic development using this toner, an image of high quality can be formed.
摘要:
A photosensitive drum with a fixed photosensitive sheet on the outer circumference of a cylindrical body that defines an image forming area. A spacer is disposed on at least one end of the outer portion of the image forming area on the cylindrical body. The spacer pushes either an electrostatic charging roller or a developing roller, which access the photosensitive sheet during an image forming process, when a seam of the photosensitive sheet approaches either the electrostatic charging roller or the developing roller to distance either the electrostatic charging roller or the developing roller from the seam of the photosensitive sheet.
摘要:
A binder resin composition which can sharply, but reversibly, melt and solidify within a narrow temperature range, a toner composition of enhanced low-temperature fixability and durability having the binder resin composition, and a preparation method thereof. The binder resin composition of the toner includes a first polymer compound having a proton donor site in a main chain, and a second polymer compound having a proton acceptor site in a main chain.
摘要:
A yellow toner for an electrophotographic imaging apparatus is provided where the toner includes: a binder resin; a pigment; and a charge control agent, wherein the pigment comprises 2-8% by weight of Pigment yellow 74 based on the weight of the toner. The toner is uniform and has small differences between toner particles in performance such as charge amount and has a long press life when used in a non-contact developing method, thereby allowing for high quality images.
摘要:
An image formation apparatus comprising a photosensitive body and a transfer medium receiving an image made of a liquid toner formed on the photo-sensitive body and further transferring the image to an image formation medium. The transfer medium has a structure in which a conductive rubber layer and a polymer surface layer made of a silicone resin containing a conductive metal oxide are formed on a surface of a roller main body, and has surface resistance of 10E10 &OHgr;/□ or less.