Canon Kabushiki Kaisha

Norio Hashimoto

Hiroaki Sakai

Masaaki Takahashi

Kazuo Kishino

Katsuhisa Matsunaka

Hiroyuki Sakakibara

Yuko Sekihara

Atsushi Iwasaki

Satoshi Ono

Motofumi Konishi

Toshio Iwaya

Yasutoshi Sugita

Kanou Tanaka

Yoshio Ando

Masahide Kotera

Yoshitaka Sano

Eiichi Fujii

Hiraku Sonobe

Masahiro Suzuki

Yasuyuki Tamura

Yasushi Sato

Masaharu Ohkubo

Hideyuki Yano

Takao Kume

Koichi Hiroshima

Tetsuo Saito

Hiroto Hasegawa

Kazuaki Ono

Junji Araya

Katsuhiko Nishimura

Takayasu Yuminamochi

Tadashi Furuya

Kiyoharu Yoshioka

Takashi Shibuya

Yasunari Kobaru

Minoru Matsuguma

Yozo Hotta

Takayuki Aizawa

Kenji Nagata

Kazuyoshi Chiku

Masaharu Tsukada

Harumi Kugoh

Fumitaka Aoki

Hirokazu Ikenoue

Tohru Tatsuno

Toshihiko Yamanaka

Tooru Saitou

Katsunori Takeuchi

The image heating apparatus includes a rubber layer and a resin tube layer on a metal core. The rubber layer includes a solid rubber layer having a thermal conductivity in a thickness direction of 0.16 W/(m&#xb7;K) or more and 0.40 W/(m&#xb7;K) or less, and a self-bonded silicone rubber layer that contains a filler of 5 vol % or more and 40 vol % or less, and has a thermal conductivity in an axial direction of 2.5 W/(m&#xb7;K) or more and a thickness of 0.5 mm or more and 5.0 mm or less, the filler having a length of 0.05 mm or more and 1 mm or less and a thermal conductivity in a length direction of 500 W/(m&#xb7;K) or more, so that a pressure roller to moderate temperature rise in a non-sheet feeding area when a small sized recording material has undergone sheet feeding can be easily manufactured.

Image heating apparatus, pressure roller to be used in the image heating apparatus, and manufacturing method for the pressure roller

A pressing member for creating a nip in which the pressing member contacts a heating member and a recording material is heated while being nip-conveyed, includes an elastic layer and a high thermal conductive elastic layer, which is provided on the elastic layer and has a thermal conductivity which is higher than that of the elastic layer. In the high thermal conductive elastic layer, carbon fibers and carbon nanofibers are dispersed in a heat-resistant elastic material.

Pressing member and image heating member using the pressing member

A pressure roller forms a nip for contacting a heating member to pinch and convey a heat recording material. The roller includes a core metal and an elastic layer containing filler. The elastic layer containing the filler includes thermal conductive filler with a length of not less than 0.05 mm and not more than 1 mm with a thermal conductivity &#x3bb;in the longitudinal direction in a range of &#x3bb;&#x2267;500 W/(m&#xb7;k), being dispersed in not less than 5 vol % and not more than 40 vol %. The elastic layer containing the filler has a thermal conductivity &#x3bb;in the longitudinal direction perpendicular to a recording material conveyance direction, of &#x3bb;&#x2267;2.5 W/(m&#xb7;k) and an ASKER-C hardness of the filler is not more than 60 degrees. A solid rubber elastic layer with a thermal conductivity &#x3bb; in a thickness direction of not less than 0.16 W/(m&#xb7;k) and not more than 0.40 W/(m&#xb7;k) is included.

Image heating apparatus and pressure roller used for image heating apparatus

A pressure roller forms a nip for contacting a heating member to pinch and convey a heat recording material. The roller includes a core metal and an elastic layer containing filler. The elastic layer containing the filler includes thermal conductive filler with a length of not less than 0.05 mm and not more than 1 mm and with a thermal conductivity &#x3bb;in the longitudinal direction in a range of &#x3bb;&#x2267;500 W/(m&#xb7;k), being dispersed in not less than 5 vol % and not more than 40 vol %. The elastic layer containing the filler has a thermal conductivity &#x3bb;in the longitudinal direction perpendicular to a recording material conveyance direction, of &#x3bb;&#x2267;2.5 W/(m&#xb7;k) and an ASKER-C hardness of the filler is not more than 60 degrees. A solid rubber elastic layer with a thermal conductivity &#x3bb; in a thickness direction of not less than 0.16 W/(m&#xb7;k) and not more than 0.40 W/(m&#xb7;k) is included.

A pressure member contacts a heating member to form a nip part where a recording material is heated and pinched-conveyed, and includes a first elastic layer and a second elastic layerhaving a higher thermal conductivity than that of the first elastic layer. An elastic layer is formed of a combination of the first elastic layer and the second elastic layer so that the thickness of the second elastic layer at the end portion is thicker than the thickness of the second elastic layer at the center portion in a longitudinal direction perpendicular to a recording material conveyance direction. Accordingly, when using the pressure member to contact the heating member to form the nip part, it is possible to reduce the difference between a center nip width and an end-portion nip width of the nip part.

Image heating apparatus and pressure roller therein having metal core and two elastic layers with different thermal conductivities

A fixing apparatus for use in an image forming apparatus such as a copying apparatus or a laser beam printer is disclosed. The fixing apparatus has a heater, a rotatable member having the heater therein, and a pressing member forming a nip by coming into contact with the rotatable member. The rotatable member is provided with a core and an elastic layer formed on the core, and the elastic layer has a JIS-A Standard rubber hardness not more than 5.degree..

Rotatable member having elastic layer and fixing apparatus having said

In a fixing device used in an image forming apparatus, temperature changes in a heating member are reduced by gradually reducing a power supply duty ratio while the heating member is subjected to temperature control aiming at a set temperature.

Fixing device

An image forming apparatus includes an image bearing member for bearing an image, a contact charger for charging the image bearing member, and a detector for detecting an electric current flowing through the charger when the charger changes a potential of a predetermined area of the image bearing member from a first potential to a second potential which is different from the first potential. In another aspect of the invention, the detector detects a flow of current through a second contact charger when a first oscillating voltage is applied by a first contact charger and a second oscillating voltage applied by the second contact charger which is different from the first oscillating voltage.

Image forming apparatus having a contact charger for varying a charge

A charging device includes a charging member contactable to a member to be charged. A bias source includes an AC source and a DC source and is effective to apply a bias voltage to the charging member. The bias voltage is provided by a superposing a constant current controlled AC voltage and a constant voltage controlled DC voltage. When a DC voltage is applied between the charging member and the member to be charged, the following equation is satisfied.

Charging device and image forming apparatus

Method and apparatus for recording information on an opto-magnetic recording medium by applying an A.C. magnetic field of a constant frequency to the opto-magnetic recording medium as a recording bias magnetic field and scanning the medium by a light beam modulated with a recording signal in synchronism with the A.C. magnetic field to record the information.

Method and apparatus for recording information on an opto-magnetic

There is disclosed an image processing system capable of effectively utilizing a large-sized display unit by expanding the image signals to be displayed.

Image processing system

An optomagnetic (magneto-optic) information reproducing or readout method including illuminating an optomagnetic (magneto-optic) recording medium with a linearly polarized light flux whose quantity is variable, detecting the value of the illumination flux from the recording medium through an analyzer, determining a threshold quantity of light at which the ratio between the detected value and the quantity of illumination light starts to deviate from a predetermined value, and scanning the recording medium with the linearly polarized light flux whose quantity is smaller than the threshold quantity of light, thereby reproducing or reading out the information stored on the recording medium. A device adapted to carry out the above-described method is also described.

Method and apparatus for setting light quantity most suitable for

There is disclosed an image processing system composed of a network of plural stations, in which the transmitted image signals can be monitored on real time basis, always utilizing the full image display area and without lack in the displayed image, by suitably converting the image signals.

An image information recording system reads image information out of a microfilm of which a plurality of image information items are recorded and records it onto a photodisk device. The microfilm has a Blip Mark indicative of the position of a frame. The mark is detected and index information for representing the address of image information recorded on the photodisk device is calculated. In another aspect, the recordable capacity of the photodisk device is sensed. As a result, when one unit of frames of image information is detected to be more than the photodisk device can hold, the one unit of image information is re-recorded on a second recording medium.

Image information recording system

Growing community of inventors

Odawara, Japan

Norio Hashimoto