Oki Data Corporation

Oki Electric Industry Co., Ltd.

Takayuki Takazawa

Akihito Onishi

Michiaki Ito

A belt unit according to an embodiment may include: an endless belt including a first surface and a second surface opposite to the first surface; and a drive roller in contact with the second surface and configured to drive the endless belt. A surface potential of the first surface of the belt is a voltage of not more than 20 volts, 0.1 seconds after an application of a voltage of 6000 volts.

Belt unit and image formation apparatus

A belt device includes a belt, a driving roller, and driven roller. The belt is endless and includes a flat outer peripheral surface, an inner peripheral surface, and a mark part provided on the outer peripheral surface and depressed toward the inner peripheral surface. The mark part has grooves extending in the first direction. Two or more of the grooves each include a middle portion away from a border between the outer peripheral surface and the corresponding groove, and an edge portion coupling the middle portion to the border, and each have a middle-portion depth, a depth of the middle portion from the outer peripheral surface, greater than an edge-portion depth, a depth of the edge portion from the outer peripheral surface, and each have a deepest portion at a position away from the border by 0.2 millimeters or more from the border toward the middle portion.

Belt device, image forming apparatus, and mark forming method

A fixing device includes an endless belt. A heat supply part is disposed inside the belt, contacts an inner circumferential surface thereof, and supplies heat thereto. A pressure member contacts an outer circumferential surface of the belt to form a nip portion, and conveys a recording medium while nipping the recording medium together with the belt. The heat supply part includes a heater having a plurality of heating sections arranged in a widthwise direction of the belt, and a thermal diffusion member extending in the widthwise direction between the heater and the belt. One surface of the thermal diffusion member contacts the inner circumferential surface of the belt, and the other surface contacts the heating sections. A plate thickness t (mm) between the surfaces of the thermal diffusion member, and a thermal diffusivity D (mm/s) of the thermal diffusion member satisfy the relationship: t&#xd7;D&#x2265;6.7.

Fixing device having a heat supply part and image forming apparatus

An image forming apparatus includes an image forming section and a transfer section. The image forming section includes a first image forming unit that forms a first developer image and a second image forming unit that forms a second developer image. The transfer section transfers, on a basis of a first transfer condition, the first developer image onto a medium, and transfers, on a basis of a second transfer condition, the second developer image onto the medium onto which the first developer image has been transferred. The second transfer condition is different from the first transfer condition.

Image forming apparatus reducing media surface roughness before forming a color image protected by transparent toner

A belt has an endless shape, and is driven to rotate by a driving roller provided on an inner side thereof. The belt includes a detection target portion on an outer surface at an end of the belt in a widthwise direction of the belt. The detection target portion includes an uneven pattern.

Belt, transfer belt unit, and image forming apparatus

An image forming apparatus includes: a plurality of rollers including a first roller rotated by receiving rotation from a drive unit and a second roller rotated with the rotation of the first roller; a belt stretched around the plurality of rollers, the belt having an inner surface; and a tension applying unit that applies tension to the belt. The inner surface of the belt has an uneven shape. Each of at least one roller of the plurality of rollers satisfies conditions expressed by &#x3bc;kmax&#x2266;0.73 and &#x394;&#x3bc;k=(&#x3bc;kmax&#x2212;&#x3bc;kmin)&#x2266;0.51, where &#x3bc;kmax is a maximum dynamic friction coefficient between the inner surface of the belt and the roller, and &#x3bc;kmin is a minimum dynamic friction coefficient between the inner surface of the belt and the roller.

Image forming apparatus having rollers, belt and a tension applying unit

A transfer belt used in an image formation apparatus is provided with surface characteristics that Vickers hardness of an outer peripheral surface of the transfer belt is within a range between being equal to or above 39 N/mmand equal to or below 60 N/mm, and a low-load creep of the outer peripheral surface is within a range between being equal to or above &#x2212;45% and equal or to below 0%.

Transfer belt, transfer belt unit, and image formation apparatus

A rotating body for use in an image forming apparatus has an outer surface in which one or more grooves are formed. The one or more grooves are oriented at an angle greater than 0&#xb0; and less than 90&#xb0; with respect to a longitudinal direction of the rotating body.

Rotating body, transfer unit, and image forming apparatus

A transportation unit includes a transportation member and a cleaning member for cleaning foreign matters attached to a surface of the transportation member. The transportation member has the surface with a contact angle &#x3b8; relative to n-dodecane between 10&#xb0; and 45&#xb0; (10&#xb0;&#x2266;&#x3b8;&#x2266;45&#xb0;) and a mirror index M between 60 and 200 (60&#x2266;M&#x2266;200).

Transportation unit and image forming apparatus

A belt device includes an endless belt including at least a base layer and a coat layer, the coat layer formed on the base layer and configuring an upper most surface of the belt; a driving member that rotates the belt and that is provided at one end of the belt to bias an inner circumferential surface of the belt; and a driven member that rotates the belt and that is provided at other end of the belt to bias the inner circumferential surface of the belt. Wherein the base layer has a mirror specularity of 20-60.

Belt device, transferring unit and image forming device

An image forming apparatus includes a belt including an abutting surface and a cleaning member disposed to abut against the abutting surface for removing a foreign substance on the abutting surface. The abutting surface has a mirror surface smoothness of 40 to 200, and a pensile hardness of 2H to 7H.

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Tokyo, Japan

Takayuki Takazawa