Kabushiki Kaisha Toshiba

Toshiba Tec Kabushiki Kaisha

Other

Fujitsu Corporation

Kabushiki Kaisha Tec

Yoshiaki Okano

Tetsuya Nakamura

Takahito Kabai

Hiroshi Hashizume

Kouichirou Satou

Hirotaka Fukuyama

Michihisa Iguchi

Seiji Arai

Satoshi Katagata

Chinobu Sakai

Noboru Furuyama

Takashi Ishikawa

Masaaki Ishikawa

Yuki Kawashima

Masatsugu Hirayama

Hiroshi Ishii

Chie Miyauchi

Masaya Tanaka

Hiroshi Katakura

Satoshi Itaya

Yoshiki Kogiso

Setsuo Takada

Katsutoshi Mita

Naomi Nakane

A fixing device includes a magnetic flux generation unit, an auxiliary heating body formed of material that generates heat from the magnetic flux generated by the magnetic flux generation unit, a rotatable fixing belt having opposing first and second ends in a direction of its rotational axis and a material that generates heat from the magnetic flux, a magnetic flux shield in contact with the auxiliary heating body and having first and second openings that expose the auxiliary body, the first and second openings being symmetrical with respect to a center point along the rotational axis between the first and second ends, a temperature sensor in contact with the auxiliary heating body through one of the first and second openings of the magnetic flux shield shielding member, and a driver that controls power supplied to the magnetic flux generation unit in accordance with signals from the temperature sensor.

Fixing device that can suppress variation in temperature, and image forming apparatus having the fixing device

In accordance with an embodiment, a character recognition apparatus comprises a decolorization control section configured to carry out a decolorization processing for a sheet; an image reading control section configured to carry out an image reading processing for the sheet to which the decolorization processing is carried out; and a character recognition processing section configured to carry out a character recognition processing for a decolorized image read through the reading processing after the decolorization processing is carried out or for a generated image generated according to the decolorized image.

Character recognition apparatus and character recognition method

A fixer includes a fixing belt configured to move around a center, a heating unit configured to induction-heat the fixing belt, a pressing member that presses an outer surface of the fixing belt, a resilient member disposed opposite to the pressing member across the fixing belt, and a heat generating member that is capable of being induction-heated and disposed along the inner surface of the fixing belt between a first position and a second position that is downstream with respect to the first position in a moving direction of the fixing belt. An upstream end portion of the resilient member in the moving direction is in contact with a third position of the fixing belt, and an angle formed with respect to the center by the second and third positions is equal to or smaller than 60&#xb0;.

Fixer that forms a nip with an induction-heated belt and an image forming apparatus having the same

In a digital copying machine according to an image forming apparatus of the invention, when a 'thick paper' mode is set through an operation panel, a main CPU sets a gradient of &#x3b3; for 'thick paper' in a &#x3b3; correction unit of an image processing unit. Thus, a toner attachment amount is controlled and changed from 1.6 mg/cmto 1.0 mg/cm, thereby widening a fixation temperature range for good fixation.

Color image forming apparatus and color image forming method having overlapping toners

A fixing device of the present invention has a fixing belt that is brought in contact with a recording medium to heat and fix a developer image formed on the recording medium. Plural supporting rollers support the fixing belt rotatably. Pressing rollers are provided opposing to the supporting rollers via the fixing belt for clamping and conveying the recording medium jointly with the fixing belt. A temperature controller raises the temperature of a heating roller to a second set temperature from a first set temperature after the temperature of the fixing belt drops to a prescribed temperature lower than that in the heating and fixing state, when shifting to the ready state after the heating and fixing state is complete.

Fixing device and temperature control method in fixing device

A fixing device includes a fixing belt movably supported by a rotatable heating member and a rotatable support member equipped with a surface elastic layer having a hardness not higher than 40&deg;. The fixing device also includes a pressurizing mechanism arranged to face the support member with the fixing belt interposed therebetween and equipped with a pressurizing member movable in synchronism with the fixing belt.

Image forming apparatus, method for forming image, and fixing device

At start of rotation of a photosensitive drum, rotation of a developing roller caused by a developing/register rollers driver is kept stopped until a time required for a predetermined point on the photosensitive member, which was located at a charging position when charging thereof by a charging device was started, to reach a development position elapses, and thereafter the developing roller is rotated by the developing/register rollers driver. When the predetermined point on the photosensitive member, which was located at the developing position when at least rotation of the photosensitive member was started, passes the transfer position, a roller cleaning voltage having the same polarity as the charge polarity of toner is applied to a transfer roller.

Electrophotographic apparatus that prevents toner from attaching to a

Disclosed is a transfer device using a transfer roller including a conductive elastic layer having a heat resistance not less than 180.degree. C., an adhesive layer formed on the conductive elastic layer, and a fluorine-based film resistance layer formed on the adhesive layer, or a transfer roller in which the adhesive strength between an adhesive layer formed on a conductive elastic layer and a fluorine-based film resistance layer formed on the adhesive layer is 150 g/cm or higher.

Roller transfer device and transfer roller manufacturing method

A developing device used in an electrophotographic apparatus has seal members fixedly disposed between both end portions of a developing roller and those portions of inner walls of a device casing which correspond to both end portions of the developing roller. The seal members are made of a material which can be charged by friction with the developing roller to have the same polarity as charged toner. The toner is blocked by the seal members and presented from entering end portions of the developing roller.

Electrophotographic apparatus having cleaning device and developing

In a developing device for developing an electrostatic latent image formed on a photosensitive member in an electrophotographic apparatus, a developing roller and a developing blade are formed such that the hardness of the surface of the developing blade is higher than the hardness of the surface of the developing roller by 30 degrees or more in JIS-A hardness. The developing blade deforms and bites into the developing roller. Accordingly, the developing roller can be brought into tight contact with the developing blade, and a great frictional force is applied to the toner passing between the developing roller and blade to fully charge the toner.

Developing device for electrophotographic apparatus

A transfer device of a contact transfer method wherein a transfer power supply applies a predetermined transfer voltage to a transfer roller contacting the rear surface of a printing sheet, so that an electric field for causing the toner to be attracted by the transfer roller is generated. A lumped constant resistor is electrically inserted between the transfer roller and the transfer power supply. The lumped constant resistor has an electric resistance smaller than an equivalent electric resistance obtained when the whole transfer roller is regarded as one electric resistor. When the electric resistance of the printing sheet changes in accordance with a change in ambient environment, the voltage drop across the lumped constant resistor is changed to compensate for the change in electric resistance of the printing sheet.

Transfer roller and toner for electrophotographic apparatus

A developing device used in an electrophotographic apparatus has seal members fixedly disposed between both end portions of a developing roller and those portions of inner walls of a device casing which correspond to both end portions of the developing roller. The seal members are made of a material which can be charged by friction with the developing roller to have the same polarity as charged toner. The toner is blocked by the seal members and prevented from entering end portions of the developing roller.

Electrophotographic apparatus having developing device with seals for

An image forming apparatus includes a brush member arranged along a photosensitive member and arranged between a transfer roller means and a charger. The image forming apparatus further includes a first voltage supply for supplying a first voltage which is sufficient to attract residual toner remaining on the photosensitive member to the brush member during a first period when an exposed area that is to be exposed by the exposing means passes the brush member, the first period occurring before the exposed area reaches the exposing means, and a second voltage supply for supplying a second voltage which is sufficient to spit the attracted toner attracted in the brush member at the photosensitive member during at least a part of a second period when a non-exposed area that is on a different area of the photosensitive member from the exposed area passes the brush member, the second period occurring before the non-exposed area reaches the exposing means.

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Tokyo, Japan

Yoshiaki Okano