Canon Kabushiki Kaisha

Takeshi Menjo

Takashi Hasegawa

Hisashi Fukushima

Kazuo Kishino

Hideo Kawamoto

Takao Ogata

Jiro Ishizuka

Koji Amemiya

Yasuo Nami

Yoshihiro Murasawa

Takahiro Kubo

Satoshi Tamura

Tatsuya Nakamura

Kazuo Suzuki

Takashige Kasuya

Toshimitsu Danzuka

Tatsuo Takeuchi

Makoto Kanbayashi

Masahiro Inoue

Tatsuhiko Chiba

Yuji Sakemi

Hiroshi Satomura

Masaaki Sakurai

Rie Saito

Takayuki Nagatsuka

Mitsuhiro Ota

Kohji Inaba

Koichi Sato

Masaaki Takahashi

Haruhiko Omata

Masami Izumizaki

Masahiro Itoh

Yuichiro Toyohara

Tatsuomi Murayama

Motohide Shiozawa

Yoichi Kimura

Masashi Suda

Hiroaki Kumagai

Takeo Tsunemi

Ryuichiro Maeyama

Jiro Ishiduka

Toru Obuchi

An image formation system includes an image forming apparatus for forming different color toner images on a recording material having a toner reception layer, a first heater for heating and pressing the toner image on the recording material, and a heater for heating and pressing the toner image on the recording material having been heated and pressed by the first heater. The first heater is operable so as to provide a granularity R of the toner image satisfying 0.5&#x2266;R&#x2266;4.0 and a glossiness G of the toner image satisfying 5&#x2266;G&#x2266;40, the second heater being operable so as to provide a granularity R of the toner image that is not more than 4.0 and a glossiness G of the toner image that is not less than 60.

Image formation system, image formation method, and image quality improvement method twice heating and pressing a toner image on a recording material

A color-mixing fixing device includes a first fixing rotary member, and a second fixing rotary member for forming a nip together with the first fixing rotary member. After toner images of a plurality of colors stacked on one surface of a recording medium are fixed by a nip, toner images of a plurality of colors stacked on the other surface of the recording medium are fixed by the nip, thereby forming full-color images on both the surfaces of the recording medium. Each of the first and second fixing rotary members has a surface rubber layer with an impact resilience of 50% or less.

Color-mixing fixing device in which impact resilience of surface layer of fixing rotary member is 50% or less

A fixing member includes a plurality of elastic layers on a core member, at least one elastic layer L1 among these elastic layers being overlaid on an elastic layer L2 having a surface roughness Rz of 10 .mu.m or more. The fixing member has a high heat conductivity, and the temperature depression of a fixing roller is moderated in a continuous paper feeding process.

Fixing member having an inner elastic layer with a surface roughness

An image forming apparatus, such as a copying machine, has a fixing device for fixing a developer image transferred to a transfer medium, such as paper, with a fixing roller whose surface is coated with a release agent, such as oil, and includes at least one feed passage member for conveying, while contacting, a transfer medium to a transfer region of the apparatus. The feed passage member has a release agent absorbing layer on the surface thereof, and is thus advantageous for preventing release agent from being transferred and adhered to a photo-sensitive drum of the apparatus. The release agent absorbing layer of the feed passage member may contain either porous particles or particles and a binder resin, and be formed on another layer for retaining release agent absorbed by the release agent absorbing layer. The feed passage member preferably constitutes a transfer medium carrying member, which may include a dielectric sheet, for supporting and carrying a transfer medium. The member may alternatively constitute a pick-up roller, a feed guide, and/or a resist roller of the apparatus.

Method for forming an image by absorbing a release agent using a release

An image forming apparatus includes an unfixed-image forming unit for forming an unfixed image having a plurality of colors on a recording material, and a fixing unit for fixing the unfixed image formed by the unfixed-image forming unit by heating the recording material bearing the image. The fixing unit can fix the unfixed image on the recording material with a first degree of fixing or with a second degree of fixing which is greater than the first degree of fixing depending on whether or not a light-transmitting-property recognition unit recognizes the recording material to have a light-transmitting property, and whether or not a black-monocolor recognition unit recognizes the unfixed image formed by the unfixed-image forming unit as a black monochromatic image. When the image forming apparatus recognizes that the recording material has a light-transmitting property and that the unfixed image is a black monochromatic image, the fixing unit can fix the unfixed image with the first degree of fixing or with the second degree of fixing based on information relating to an image formed by the fixing unit.

Image forming apparatus capable of forming an image having a plurality

An image forming apparatus having an image carrying member for carrying an electrostatic image, fluororesin has a surface layer containing a fluororesin, and a developing device for developing the electrostatic image on the image carrying member. The image carrying member has a surface layer containing a fluororesin. The developing device has a developer carrying member, which is arranged as opposed to the image carrying member and which carries a developer, and a bias applying device for applying a development bias voltage to the developer carrying member. A period of a waveform of the bias voltage applied by the bias applying device has an oscillating part and a quiescent part.

Developing device using development bias having oscillating part and a

An image forming apparatus includes a recording material supporting member for supporting and transporting a recording material, an image forming device for forming an image on the recording material supported by the recording material supporting member, and a polishing device, having polishing particles provided on the surface thereof and a holding portion for holding the polishing particles, for polishing the recording material supporting member.

Image forming apparatus and oil cleaning member

The present invention provides an image forming apparatus comprising an electrophotographic photosensitive member, developing means using developing agent including carrier and toner, toner image forming means for forming on the photosensitive member a detection toner image by which toner density of the developing agent is detected, toner density detection means for measuring and detecting density of the detection toner image formed, judge means for judging whether the measured density of the detection toner image is included in a high detection sensitivity area of the detection means, and change means for changing or altering a toner image forming condition of the toner image forming means when the measured density of the detection toner image is not included in the high detection sensitivity area.

Image forming apparatus having detection means for detecting density of

An image forming apparatus includes an image bearing member for bearing an electrostatic image; a developer carrying member, opposed to the image bearing member, for carrying a developer containing toner; bias voltage applying device for applying a developing bias voltage to the developer carrying member, the bias voltage satisfying: ##EQU1## V1 (V): a voltage applying force to the toner toward the developer carrying member away from the image bearing member;

Developing apparatus using blank pulse bias

An image forming apparatus includes a movable image carrier, and a plurality of developing devices for developing a latent image formed on the image carrier. The plurality of developing devices contain developing agents of different colors and are arranged in the direction of movement of the image carrier. The plurality of developing devices are arranged in an ascending order of the visual sensitivity of the colors of the developing agents from the upstream side in the direction of movement of the image carrier, for example, in one aspect cyan, magenta, yellow and black developing devices may be sequentially arranged from an upstream side to a downstream side and operated in an order of cyan, magenta, yellow and black.

Color image apparatus including a plurality of developing devices having

An image forming apparatus has a movable image bearing member, a plurality of developing devices operable for development at different locations along the direction of movement of the image bearing member to develop the image bearing member with toners of plural colors, and a transfer medium carrying member for carrying a transfer medium thereon and conveying the transfer medium to a transfer position. The toner images of plural colors on the image bearing member are superposition-transferred onto the transfer medium carried on the transfer medium carrying member. The transfer medium carrying member is capable of carrying a plurality of transfer mediums at different locations thereon. When the maximum length of the respective gaps between adjacent ones of the plurality of developing devices along the direction of movement of the image bearing member is D, the peripheral velocity of the transfer medium carrying member is U, and the peripheral velocity of the image bearing member is V, at least one of the gaps between adjacent ones of the plurality of transfer mediums carried on the transfer medium carrying member is greater than D.times.U/V.

Image forming apparatus having a plurality of developing means

An image forming apparatus includes an image bearing member for bearing an image, a rotatable recording material bearing member for bearing a recording material and conveying the recording material to a transfer station, the image formed on the image bearing member being transferred onto the recording material born on the recording material bearing member at the transfer station, and a cleaning means capable of being contacted with a surface of the recording material bearing member to clean the surface of the recording material bearing member at a cleaning station. When a length (L1) of a recording material born on the recording material bearing member in a rotational direction of the recording material bearing member is greater than a distance (L2) from the transfer station to the cleaning station along the rotational direction of the recording material bearing member, after the image is transferred onto the recording material born on the recording material bearing member, the recording material is conveyed to the transfer station again.

Image forming apparatus having recording material bearing member

An image forming apparatus includes a movable recording material carrying member for carrying at least first and second recording materials thereon at the same time, a light irradiating device for irradiating an original, an image forming device for forming images on the recording materials at an image forming position in conformity with images of an irradiated original, the image forming device being capable of forming images on the recording materials carried to the image forming position a plurality of times, and an inverting device for inverting the original so that both surfaces of the original are irradiated with light so that an image on the first surface of the original is formed on one surface of the first recording material and an image on the second surface of the original is formed on one surface of the second recording material.

Image forming apparatus for inverting an original to record both

A fixing rotatable member for use in an image forming apparatus such as a copying apparatus or a laser beam printer is disclosed. The fixing rotatable member includes a base member and an elastic layer provided on the surface thereof. The elastic layer is addition type silicone rubber in which resin-like polyorganosiloxane and 0.1 to 2 percent by weight of inorganic fine powder are mixed.

Rotatable member for fixing in which inorganic filler is contained in

An apparatus for forming color toner images on an electrophotographic photosensitive drum and transferring the color toner images onto a transfer drum, is provided with plural color development devices positioned along the rotating direction of the photosensitive drum and opposed thereto, and the above-mentioned transfer drum of a peripheral length is capable, in the rotating direction of the photosensitive drum, of simultaneously supporting two images of a maximum length L to be formed, wherein a relation:

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Tokyo, Japan

Takeshi Menjo