Canon Kabushiki Kaisha

Masami Izumizaki

Akio Suzuki

Yasushi Miura

Hisashi Fukushima

Yoshihiro Takada

Toshimitsu Danzuka

Haruhiko Moriguchi

Yuji Sakemi

Koji Amemiya

Haruhiko Takahashi

Yoshinori Nagao

Jiro Moriyama

Nobuatsu Sasanuma

Eiichi Takagi

Ken Tsuchii

Nobuyuki Watanabe

Makoto Takamiya

Hidejiro Kadowaki

Kosuke Yamamoto

Masafumi Wataya

Takao Ogata

Nobuhiko Takekoshi

Takashi Uchida

Toshiyuki Yanaka

Yutaka Koizumi

Toshiaki Hirosawa

Torachika Osada

Hidemi Kubota

Masahiro Inoue

Yasushi Murayama

Takeshi Menjo

Noboru Kunimine

Kunihiko Kitayama

Yoshiyuki Nagase

Ikuo Kuribayashi

Tatsuo Shimmoto

Shigeru Ohki

Shigeru Matsuzaki

Shigeru Oki

Takeshi Oota

When an image is printed with inks each containing a polymer emulsion and a film forming agent, the ejection of the inks is controlled so that the ink having a relatively low dynamic surface tension forms dots having a higher dot connectivity than the dots formed with the ink having a relatively high dynamic surface tension.

Image processing apparatus, image processing method and image printing apparatus

An image forming apparatus forming a full color image by plural color materials. An image of an original is color-separated so as to form a color separation signal, and the color separation signal is converted to a color signal corresponding to each color material. The color signal is color-corrected so as to correct a color mixing state of the plural color materials, and a color image is formed by the corrected color signal. A test image of single color is formed, and a density of the test image is detected. Control is performed on a correcting condition for color-correcting the color signed based on the detected density. The correction to the color signal is delayed until toner is supplemented to the developing device.

Image forming apparatus

An ink jet recording apparatus performing recording by discharging ink onto a recording medium is provided with a conveying belt for conveying the recording medium by the attraction of static electricity, an electrode provided to be in contact with the recording medium conveyed by the conveying belt, and a power source capable of charging the electrode with the charge which has the polarity opposite to the charge carried by the conveying belt. The main droplet and satellite split from the ink droplet are impacted on the recording medium to prevent the adhesion of the satellite to the discharging port of the discharging surface of the recording head, thus maintaining desirable recording for a long time.

Ink jet recording apparatus

An image forming apparatus includes reading means for reading the density of a test pattern corresponding to each of plural recording elements of a recording head, the recording elements being arranged in an array, and the test pattern being recorded by the recording elements. An eliminating means eliminates error information, recorded from an area outside a test pattern are, from density information obtained by the reading means when the density of a test pattern end portion corresponding to an end portion of the array of plural of recording elements is determined. A means is provided for uniforming the image densities in correspondence with the plurality of recording elements based on density information from which the error information is eliminated by the eliminating means.

Apparatus and method for regulating image density

An ink jet recording apparatus performing recording by discharging ink from a recording head onto a recording medium. A conveying belt for conveys the recording medium by the attraction of static electricity, an electrode contacts the recording medium conveyed by the conveying belt, and a power source charges the electrode with a charge having a polarity opposite to a charge carried by the conveying belt. The recording head includes a discharge port and a control electrode formed around the discharge port. A voltage identical to the polarity of the surface potential of the recording medium is generated by a power source and applied to the control electrode to cause the control electrode to repel any satellite droplet of the polarity identical to the voltage that splits from a discharged ink droplet during the flight thereof.

Ink jet recording apparatus with control electrode on recording heads

An image recording apparatus includes a recording head in which a plurality of recording elements are arranged so as to form an image on a recording medium, a device for causing the recording head to print a predetermined test pattern, an image density reading device for reading the density of the test pattern formed by the recording head, an uneven image density correction device for correcting conditions for driving the plurality of recording elements in accordance with the result of reading, so as to make even the density of the image, a recording stabilizing device for stabilizing a recording operation performed by the recording head, and a control device for operating the recording stabilizing device before the test pattern is printed and operating the test pattern printing device after the recording head has been stabilized by the recording stabilizing device.

Image reading apparatus with a function for correcting nonuniformity in

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 developer container comprising toner particles and carrier particles. A developer carrying member is disposed in the developer container, for carrying the developer to a developing zone where an electrostatic latent image is developed. A first toner container contains toner particles, and a first supply mechanism supplies toner particles from the first toner container to the developer container in response to a toner supply signal, to maintain a ratio of toner particles to carrier particles constant. A second toner container contains toner particles, and a second supply mechanism supplies toner particles from the second toner container to the first toner container, to maintain the amount of toner particles in the first container constant.

Image forming apparatus including a two-stage toner supply system

An ink jet recording apparatus of the present invention has an ink jet recording head having an orifice from which an ink drop is ejected and an energy generation means for ejecting an ink fluid in the orifice. A first electrode is formed in the orifice and is connected electrically to the ink fluid. A second electrode is formed in an opposite position to the orifice with a designated distance from the orifice. A voltage controller applies a first voltage during a time period from a time when an ink fluid is ejected from the orifice to a time when the ink fluid is separated in 2 or more ink drops during traveling, and immediately after applying the first voltage, applies a second voltage which has an identical polarity to a polarity of the first voltage and has an absolute value less than an absolute value of the first voltage.

Ink jet recording apparatus, and method with control of ink drops and

An image recording apparatus includes a recording head in which a plurality of recording elements are arranged so as to form an image on a recording medium, a device for causing the recording head to print a predetermined test pattern, an image density reading device for reading the density of the test pattern formed by the recording head, an uneven image density correction device for correcting conditions for driving the plurality of recording elements in accordance with the result of reading, so as to make even the density of the image formed in accordance with the result of reading, a recording stabilizing device for stabilizing a recording operation performed by the recording head, and a control device for operating the recording stabilizing device before the test pattern is printed and operating the test pattern printing device after the recording head has been stabilized by the recording stabilizing device.

A developing device is provided with a developing container for accommodating developing agent including toner, a rotating developing agent carrier is arranged to face an image carrier carrying an electrostatic image for carrying the developing agent, and a conductive member is arranged along a longitudinal direction of the developing agent carrier with a spacing from the developing agent carrier. The conductive member is provided over longer than the longitudinal area of the developing agent carrier, and a voltage application circuit is employed for applying a voltage of the same polarity to a charging polarity of the toner to the conductive member.

Developing device preventing scattering of developing agent by

This invention relates to an image forming apparatus having a plurality of image bearing members including a first image bearing member and a second image bearing member, a transferring material bearing member for bearing the transferring material to respective transfer positions of the plurality of image bearing members, detecting a detecting device for detecting the density of a toner patch formed on the second image bearing member after the toner patch has passed the transfer position of the second image bearing member. The orientation of the image bearing members are such that the time from when the first image bearing member and the transferring material bearing member are detached from each other to when the toner patch reaches the transfer position of the second image bearing member is larger than L/V (sec) where L (mm) is the distance between the first image bearing member and the second image bearing member in a direction of movement of the transferring material bearing member and V (mm/sec) is the speed of the transferring material bearing member.

In an image forming apparatus for forming an electrostatic latent image corresponding to an image signal and for developing the latent image, a signal value corresponding to an amount of toner consumed by the development is counted by using the image signal. A toner supplement mechanism is controlled on the basis of the signal value, and an error component of the counted signal value. In addition, toner is supplied based on the counted signal value or a detected toner density in accordance with the number of image formations.

Image forming apparatus which supplies toner based on counted signal

In an image recording apparatus having a recording head, recording may be interrupted (for example, to permit transfer of new image data after a predetermined amount of recording is performed). Recording quality is maintained by compensating for the change in head temperature which occurs during the interruption. This is done by detecting the temperature of the recording head and/or counting the interruption time, and driving the recording head in a stand-by mode or correcting the image signal in accordance with the temperature difference between interruption and resumption of recording.

Apparatus and method for maintaining image quality when image recording

A developing device for developing an electrostatic latent image includes a rotatable developer carrying member for carrying a developer composed of toner particles and magnetic carrier particles, wherein the developer carrying member rotates through a supply position where the developer is supplied to a surface of the developer carrying member, a regulating position where a regulating member for regulating a thickness of a layer of the developer on the surface is disposed, a developing position where the electrostatic latent image is developed, and a removing position for removing the developer remaining on the surface after a developing operation, in the order named. A stationary magnet is disposed in the developer carrying member. The magnet includes a developing magnetic pole for forming a magnetic field at the developing position, and a plurality of conveying magnetic poles disposed between the supply position and the regulating position, wherein a peak of magnetic flux density of each of the conveying magnetic poles is 10-49% of a peak of the magnetic flux density of the developing magnetic pole.

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Yokohama, Japan

Masami Izumizaki