Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Toshiba Corporation

Mitsuaki Kohyama

Toshihiro Kasai

Haruhiko Ishida

Naruhito Yoshida

Takashi Shimazaki

Tadayoshi Ohno

Kunihiko Miura

Shinya Tomura

Shigenobu Osawa

Fuminobu Nishimura

Kenshi Toshimitsu

Osamu Takagi

Kazuhiko Kikuchi

Minoru Yoshida

Masashi Hiroki

Yasuo Hosaka

Takeo Miki

Rintaro Nakane

Jiro Egawa

Kouji Hirano

Yuka Nakamura

Akihiro Kanazashi

Yuuji Suzuki

This invention provides a new and improved image-forming apparatus which is of relatively easy manufacture and which provides a clear, sharp image. This apparatus is an 'ink jet' printer which utilizes a liquid dispersion of toner as the image-forming material. The liquid dispersant is dielectric relative to the toner particles. The toner particles agglomerate when placed under an electric charge and these agglomerated particles are ejected in accordance with an image signal. The toner forms an image on an image holder which is transferred to a recording medium such as paper. This invention has the provision for four-color printing.

Image recording apparatus having an intermediate image receiving means

The recording head have a substrate and a plurality of ring-shaped recording electrodes juxtaposed on the substrate. A counter electrode is located above the recording electrodes and spaced apart therefrom by a predetermined distance. Each recording electrode consists of a ring and a lead. A pulse generator is connected by an IC (not shown) to the leads, for applying a drive voltage to each recording electrode. The drive voltage consists of a bias voltage and a recording voltage higher than the bias voltage. When a bias voltage, having the same polarity as a charged polarity of coloring particles dispersed in an insulating liquid, is applied to each recording electrode, potential wells are formed. The coloring particles in ink are thereby trapped in the ring of the electrodes. The coloring particles agglomerate in the apical part of the ink meniscus formed at the recording electrode. When the recording voltage, having the same polarity as a charged polarity of the coloring particles. is applied to any recording electrodes selected in accordance with an image signal, the agglomeration of coloring particles flies from the potential well toward the counter electrode, forming any dot on a recording medium interposed between the recording head and the counter electrode.

Image forming apparatus in which a potential well is formed in an

With an automatic wicket apparatus, a commutation ticket is provided With a second record section for recording a character pattern corresponding to information for entrance or exit in the form of a magnetic latent image, besides a first record section for encoding and recording the information for entrance or exit. At the time of entrance, a character pattern including the date of entrance and entraining station name is recorded as a magnetic latent image in the second record section. At the time of exit, a character pattern including the date of exit and alighting station name is recorded as a magnetic latent image in the second record section. In case of suspicion, the character pattern in the form of a magnetic latent image in the second record section of the record medium is visualized by using a magnetic latent image-visible image conversion member.

Record medium and record medium processing apparatus

A transfer roller is provided near a developing roller which is set, at a relative speed of substantially zero, in contact with a photosensitive drum to develop an electrostatic latent image on the photosensitive drum into a visual image. A toner transfer roller supplies a toner, that is, a one-component developing agent which is stored in a toner storage section to the developing roller and receives that toner which is unspent upon development from the developing roller. The unspent toner transferred to the toner transfer roller is brought into abutting contact with a mesh network of a toner separating member to separate the toner from the toner transfer roller over a predetermined effective length. By so doing it is possible to erase a developing hysteresis from the developing roller and, at the same time, collect the toner back into the toner storage section so that the collected toner is mixed with a fresh toner for use at the next developing cycle.

Developing apparatus including means for collecting used developing agent

An image forming apparatus includes a transfer brush for transferring to a paper sheet a developed image on an photoconductive drum. The transfer brush is formed in a plate-like shape by a number of electroconductive fibers bundled together. The transfer brush has a contact portion set in elastic contact with the drum. The brush presses the paper sheet, which is fed by the feeding device, against the drum under a predetermined pressing force. A DC current supply applies voltage to the paper sheet through the transfer brush so as to electrostatically attract the developed image to the paper sheet. The transfer brush is inclined to the image carrier so as to allow the paper sheet to be guided into an area between the drum and the transfer brush.

Image forming apparatus having a transfer brush of electroconductive

An image forming apparatus for forming a toner image. The apparatus includes a photosensitive drum, a laser device for forming a latent image on the photosensitive drum, a developing device for developing the latent image with a toner agent/and for cleaning the toner agent remaining on the photosensitive drum therefrom while the latent image is developed, a transfer device for transferring the developed image on the photosensitive drum to a recording medium such as a paper sheet, a disordering and charging device for disordering the toner agent remaining on the photosensitive drum after transfer of the developed image by the transfer device so as to render the developed image unreadable or nonpatterned, and for charging the photosensitive drum at a predetermined potential while the toner agent remaining on the photosensitive drum is disordered and a bias source for supplying the disordering and charging device with a bias voltage having an AC bias voltage.

Image forming apparatus

A developing device comprises a toner separating member placed in contact with a developing roller for developing a latent image on a photoconductive drum into a visible image with nonmagnetic toner conveyed as a one-component developing agent, and a toner feeding roller provided near the toner separating member. The toner separating member allows the toner which has passed on a developing position of the photosensitive drum to be separated from the developing roller. The toner feeding roller allows the separated toner to be transferred toward a toner receiving side of the developing roller.

Developing device for developing an electrostatic latent image by a

An image forming apparatus having a humidity detector which is detachably attached to the main apparatus body that accommodates an image forming member. The humidity detector detects a humidity in the vicinity of the image forming member, converts the detected humidity into a relative humidity and outputs it. Based on the value of the output relative humidity, image forming conditions, such as the amount of exposure, are set. The humidity detecting unit contains a time detecting unit for detecting the time for replacement.

Image forming apparatus with a humidity detector

A recording apparatus including an image carrying body, an exposing device for exposing the image carrying body, to form an electrostatic latent image, a developing and cleaning device for supplying a developing agent to the electrostatic latent image, to develop the latent image, and for removing the developing agent remaining on the image carrying body, a transfer device for transferring the developed image to a sheetlike material, and a disordering and charging device for disordering the developing agent remaining on the image carrying body after transfer of the developed image, and for charging the image carrying body.

Image forming apparatus with developing and cleaning system

A recording apparatus comprising an image carrying body, a device for forming an electrostatic latent image on the image carrying body, a developing and cleaning device adapted to press an elastic developing member, having a developing agent formed on the surface thereof, against the latent image, for sliding contact with a speed difference therebetween, to reverse-develop the latent image, and to remove developing agent remaining on the image carrying body, and a contact-transfer device for pressing a sheetlike material against the developing agent image on the image carrying body, to transfer the developing agent image to the sheetlike material. The developing agent on the elastic developing member is a one-component developing agent charged to the same polarity as the electrostatic latent image.

Image forming apparatus for developing a latent image on an image

This invention relates to a developing method which comprises forming a developing agent layer on the surface of a developing agent-carrying body by pressing a developing agent to the developing-agent carrying body by means of a coating member, and electrostatically depositing toner particles from the developing agent layer onto an electrostatic latent image formed on an image-bearing body which faces the developing agent layer. The developing agent contains toner particles including a synthetic resin with a glass transition point of 50.degree. C. or above and a softening point of 110.degree. to 116.degree. C. and white or colorless auxiliary particles, said auxiliary particles being capable of being oppositely charged with respect to the polarity of the charge on the charged toner particles or charged to a lower positive potential than the positively charged toner particles or charged to a higher negative potential than the negatively charged toner particles.

Developing method for electrostatic images

A recording apparatus comprising an image carrying body, a device for forming an electrostatic latent image on the image carrying body, a developing and cleaning device for supplying a developing agent to the electrostatic latent image, to reverse-develop the latent image, and for removing developing agent remaining on the image carrying body, and a contact-type transfer device for pressing a sheetlike material against the developing agent image on the image carrying body, to transfer the developing agent image to the sheetlike material. The developing agent on the elastic developing member is one-component developing agent charged to the same polarity as the electrostatic latent image.

Image forming apparatus with a developing and removing device

A laser actuated image recording apparatus having an ink retaining layer. Concentrated light is projected towards a flexible film ink retaining layer so as to heat ink contained thereon and cause bubbles to form in the ink. The bubbles burst and propel ink droplets towards a recording member.

Laser actuated recording apparatus

In an image recording apparatus according to the present invention, a developing device and removing means are constituted as one unit, and the unit is freely inserted into and removed from the apparatus body. When an image is formed or when the unit is inserted or removed, developing powder, which is dispersed or fallen from the opening of the unit, is received by a developing powder receiving section, and the powder is chemically softened or melted.

Image recording apparatus that prevents toner dispersion

An image forming apparatus including a first image forming unit for forming a first electrostatic latent image having two distinct portions on an image carrier, a first developing unit for developing the first electrostatic latent image into a first visible image on the image carrier, a charging unit for charging the image carrier with the first visible image thereon, a second image forming unit for forming a second electrostatic latent image on the image carrier, a second developing unit for developing the second electrostatic latent image into a second visible image on the image carrier, and a transferring unit for transferring the first and second visible images from the image carrier onto an image bearing medium. In the image forming apparatus, the first developing unit contains a developer including colored particles and additive particles, the additive particles having a color substantially the same as the image bearing medium or being substantially colorless and transparent, and a bias voltage applied across the first developing unit and the image carrier for transferring the colored particles onto one of the two distinct portions of the first electrostatic latent image and the additive particles onto the other of the two distinct portions of the first electrostatic latent image.

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Tokyo, Japan

Mitsuaki Kohyama