| Endless belt type transferring apparatus and image forming apparatus -> Monitor Keywords |
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Endless belt type transferring apparatus and image forming apparatusRelated Patent Categories: Electrophotography, Image Formation, Transfer, Color, From Plural Photoconductive Members (e.g., Drums)Endless belt type transferring apparatus and image forming apparatus description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060210323, Endless belt type transferring apparatus and image forming apparatus. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to electrophotographic image forming apparatuses such as printers, copying machines, and facsimile machines that form an image on a recording medium. More particularly, the invention relates to an image forming apparatus with an endless belt type transferring apparatus that transfers a recording medium to a toner image forming section. [0003] 2. Description of the Related Art [0004] A conventional image forming apparatus employs an endless-belt type transferring apparatus. Because voltage is applied to a print medium through the endless belt transferring apparatus, some specific electrical properties are required of the endless belt. For example, the surface resistance of the endless belt is selected to be in a specific range for high quality images. [0005] The conventional endless belt is manufactured so that the surface resistance is within a specific range merely at room temperature and normal humidity. Therefore, when operating conditions of the endless belt type transferring apparatus change due to changes in temperature and humidity, the surface resistance of the endless belt changes, failing to maintain uniform transfer performance. Thus, the conventional endless belt type transferring apparatus is not sufficient for obtaining high quality images. SUMMARY OF THE INVENTION [0006] An object of the present invention is to provide an endless belt that maintains good, uniform transfer performance and provides high quality images. [0007] Another object of the invention is to provide an endless belt having a surface resistivity .rho. s and a volume resistivity .rho. v such that 0.3.ltoreq.(log .rho. s-log .rho. v).ltoreq.1.3. [0008] An endless belt transports a recording medium through image forming sections and transfers toner images from corresponding ones of the image forming sections onto the recording medium. The endless belt has a surface resistivity and a volume resistivity. The surface resistivity and the volume resistivity are related such that 0.3.ltoreq.(log .rho. s-log .rho. v).ltoreq.1.3 where .rho. s is the surface resistivity in .OMEGA./.quadrature. after a voltage of substantially 500 V is applied for ten seconds to the endless belt and .rho. v is the volume resistivity in .OMEGA.cm after a voltage of substantially 250 V is applied for ten seconds to the endless belt. [0009] The endless belt has a single layer structure. [0010] The endless belt is made of a base material having a Young's Modulus greater than 200 MPa. [0011] The base material of the endless belt is polyamide-imide. [0012] The base material of the endless belt is polyimide. [0013] The endless belt contains nano carbon. [0014] The endless belt is made by centrifugal molding. [0015] The endless belt is made by using a family mold. [0016] An image forming apparatus incorporates the aforementioned endless belt. The image forming apparatus includes a photoconductor, a charging unit, an exposing unit, a developing unit, and a transfer unit. The charging unit charges a surface of the photoconductive drum. The exposing unit illuminates the charged surface of the photoconductor to form an electrostatic latent image. The developing unit develops the electrostatic latent image with toner into a visible image. The transfer unit transfers the visible image onto a recording medium carried on the endless belt. [0017] Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. BRIEF DESCRIPTION OF THE DRAWINGS [0018] The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limiting the present invention, and wherein: [0019] FIG. 1 is a side view of an image forming apparatus according to the invention; [0020] FIG. 2 is a perspective view of an endless belt type transferring apparatus; [0021] FIGS. 3A and 3B illustrate a method of measuring the surface resistivity of an endless belt, FIG. 3A being a top view and FIG. 3B being a side view; Continue reading about Endless belt type transferring apparatus and image forming apparatus... Full patent description for Endless belt type transferring apparatus and image forming apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Endless belt type transferring apparatus and image forming apparatus patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Endless belt type transferring apparatus and image forming apparatus or other areas of interest. ### Previous Patent Application: Developing unit and image forming apparatus Next Patent Application: Image forming apparatus Industry Class: Electrophotography ### FreshPatents.com Support Thank you for viewing the Endless belt type transferring apparatus and image forming apparatus patent info. 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