Bridgestone Corporation

Hiroyuki Kanesugi

Koji Takagi

Hidefumi Kotsubo

Hiroyuki Anzai

Junji Sakata

Shuyou Akama

Hajime Kitano

Hikaru Ishikawa

Takayuki Sugimura

Shinichiro Sugi

An object of the present disclosure is to provide an actuator having even better durability than the conventional actuator. Specifically, an actuator has an actuator main body constituted of a cylindrical tube capable of expanding/contracting by hydraulic pressure and a sleeve for covering an outer peripheral surface of the tube, the sleeve having a cylindrical structure formed by cords woven to be disposed in predetermined directions, wherein: the inner diameter r(mm) of the tube, the thickness t (mm) of the tube, the storage elastic modulus E' (MPa) of the tube at 25&#xb0; C., and the mesh aperture ratio A of the cords constituting the sleeve in a pressurized state satisfy the following formula (1):50&#x2264;&#x2032;&#xd7;()/&#x2264;600&#x2003;&#x2003;(1).

Actuator

This invention relates to a photo-curing or electron beam-curing adherent resin composition being excellent in the adhesiveness to various adherends such as metal oxide, metal, resin and so on, and more particularly to an adherent resin composition of a photo-curing or electron beam-curing type comprising a difunctional urethane (metha)acrylate oligomer (A) and a monomer component (B), characterized in that the urethane (metha)acrylate oligomer includes a urethane prepolymer portion composed of a polyol and a polyisocyanate wherein repetitive number of urethane prepolymer portion (n) is 10-30, and the monomer component (B) is a cyclic monomer having a (metha)acryloyl group.

Adherent resin composition

In the formation of a conductive rollera compound forming an elastomer by curing through an electron beam irradiation or a ultraviolet ray irradiation is applied onto an outside of a shaft memberto form an elastomeric coating layerR and then the elastomeric coating layer is cured through an irradiation of an electron beam or a ultraviolet ray to form an elastic layer, whereby the elastic layer can be formed cheaply without sacrificing precision of peripheral dimension to largely reduce the cost of the conductive roller.

Method of producing a conductive roller utilizing a semi-curing step

A conductive roller such as a developing roller, a charging roller or the like provided with a resin coating layer on a surface of an elastic layer, and more particularly to a conductive roller having the resin coating layer using an ultraviolet-curing type resin or an electron beam curing type resin and being obtained by contriving a structure of the resin coating layer, rendering the resin coating layer to contain microparticles, controlling the particle size of the microparticles, or forming the resin coating layer after the outer peripheral surface of the elastic layer is subjected to surface treatment.

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Tokyo, Japan

Hiroyuki Kanesugi