Ricoh Company, Ltd.

Kyoichi Ashikawa

Minoru Matsuo

Norihiko Aze

Kohji Kamiya

Nozomu Takahata

Takayuki Yoshii

Makoto Nakamura

Noriyuki Kamiya

Tsuyoshi Imamura

Atsushi Ohta

Yoshiyuki Takano

Taisuke Tokuwaki

Takeo Araki

Fumio Okuya

Hisatsugu Nagano

In a method for evaluating a fixing member to fix a toner having a surface layer, a hardness test is carried out by applying a pressure deformation from the surface side of the fixing member, and when a deformation of the surface layer by the pressure deformation is within an elastic range, the fixing member is regarded as a standard product.

Method for evaluating fixing member and fixing belt and thermal fixing roller

A method for evaluating a fixing belt includes forming a fixing belt which includes a substrate, an elastic layer laminated on the substrate, and a mold releasing layer laminated on the elastic layer. A universal hardness test for the fixing belt is performed. The fixing belt is judged as an acceptable product if a creep value Cis included within a range of 0.40&#x2266;C&#x2266;3.50 (%) when the universal hardness test is performed for the fixing belt and when the creep value C, which is measured from the side of the mold releasing layer, is defined by the following formula:-)/&#xd7;100 (%)where his a pushed depth when a test load reaches a predetermined value which is kept for a predetermined period of time, and his a pushed depth when a predetermined period of time is elapsed after the test load is removed.

Fixing belt and method for evaluating it

Disclosed are a fixing belt and a method for evaluating it in which an occurrence of crumple can be prevented by means of accurate evaluation whether a surface of the fixing belt has a appropriate flexibility or not. In this method for evaluating, a universal hardness test is achieved for the fixing belt in which an elastic layer and a mold releasing layer are laminated on a substrate, the fixing belt is judged as an acceptable product if a creep value Cis included within a range of 0.40&#x2266;C&#x2266;3.50(%) when a creep value Cwhich is measured from the mold releasing layer side is defined by a formula below.=()/&#xd7;100(%)where his a pushed depth (mm) when a test load reaches a predetermined value which is kept for a predetermined period of time, and

A development roller for developing a latent electrostatic image to a visible toner image with toner, including a surface layer which contains a guanamine-skeleton-containing compound.

Development roller

A developing roller of monocomponent developing system, in which a low hygroscopic material is used for a dielectric layer, thereby suppressing a change of electric properties of the layer caused by water absorption, that is, a dielectric layer using a low hygroscopic material, namely, a low hygroscopic elastomer or a low hygroscopic polymer is used at an outer surface of a conductive supporting body where, as a concrete example of the elstomer or the polymer, polyethylene, polypropylene, ethylenic copolymer, rigid polyvinyl chloride, fluoro resin, acetal resin or mixtures thereof, or the elastomer or the polymer in which manganese-aluminum magnet, strontium ferrite, barrium ferrite of mixtures thereof is dispersed.

Developing roller of monocomponent developing system

Growing community of inventors

Ohta-ku, Japan

Kyoichi Ashikawa