Canon Kabushiki Kaisha

Shinkichi Takahashi

Toshiaki Miyashiro

Takao Aoki

Eihiro Sakaki

Fumihiro Ueno

Giichi Marushima

Hiroshi Tanaka

Koji Suzuki

Tatsuya Kobayashi

Nobuyuki Miyake

Yujiro Ando

Yoshikazu Yokomizo

Nagao Hosono

Hatsuo Tajima

Hiroaki Tsuchiya

Matsuomi Nishimura

Yoshihiro Kawatsura

Hirokazu Negishi

Ikuo Souma

Umi Tosaka

Shusei Tsukada

Touru Takahashi

Kouichi Tanikawa

Takao Komiyu

Shinichi Iwasaki

An image forming apparatus for forming an image on a recording medium has an image forming device for forming an image on the recording medium, a conveyance path for conveying the recording medium so that an image is formed by the image forming device, a first casing having a portion of the conveyance path, a second casing having a portion of the conveyance path and being openable relative to the first casing, and a third casing having a portion of the conveyance path and being openable relative to the second casing. The relatively openable casings, each having a portion of the conveyance path, provide an image forming apparatus in which a jam can be dealt with easily.

Image forming apparatus featuring a plurality or relatively moveable

A superposed image forming apparatus wherein toner images are superposedly transferred onto a transfer material includes an image bearing member; a device for forming a toner image on the image bearing member; a transfer material carrying member, disposed opposed to the image bearing member, for carrying a transfer material in synchronism with the toner image on the image bearing member; a transfer material supplying device for supplying the transfer material to the transfer material carrying member; a transfer bias voltage source for applying to the transfer material carrying member a bias voltage for image transfer from the image bearing member to the transfer material; an attraction member for urging the transfer material to the transfer material carrying member to hold the transfer material on the transfer material carrying member; an attraction bias voltage source for applying a bias voltage to the attraction member; the bias voltage applied to the attraction member is changed in association with on-and-off of the bias voltage application to the transfer material carrying member so as to maintain a constant surface potential of the transfer material carrying member.

Overlaid image forming apparatus with coordinated transfer bias and

The present invention provides an image forming apparatus having, an image bearing member; an image forming device for forming an image on the image bearing member; a transfer sheet bearing device for bearing and conveying a transfer sheet, to which a first voltage is applied for transferring the image formed on the image bearing member onto the transfer sheet born by the transfer sheet bearing device; and a discharging device for causing the discharge in the transfer sheet when the transfer sheet is separated from the transfer sheet bearing device, to which a second voltage having the same polarity as that of the first voltage and having a value equal to 80%-120% of the first voltage is applied.

Image forming apparatus with transfer sheet bearing means

An image forming apparatus includes a detector for measuring the surface potential of a photosensitive member on which an electrostatic latent image is formed and a controller which regulates image formation plural times in accordance with the measured surface potential based on the length of time between image formations. In another aspect, the image forming apparatus includes a light source and a setting device for manually setting the quantity of light therefrom between a maximum and minimum value. A test sample of a predetermined optical density is arranged to be illuminated by the light source so as to produce a test light for projection onto a recording medium. A detector detects an electrical surface condition of the test-lighted recording medium. In response to the detected electrical surface conditions, and a controller regulates the image formation in accordance with the detector. The light from the light source is adjusted so that illumination of the test sample assumes a standard value intermediate the maximum and minimum values, and so that illumination of an original assumes the value set by the setting device.

Image forming apparatus which adjusts illumination levels independently

A developing apparatus or a color image forming apparatus using the developing apparatus, includes a developer carrying member for carrying electrically charged developer, an electrode plate of elastic material having a side contacted to the developer on the developer carrying member, a vibratory voltage source for forming a vibratory electric field between the developer carrying member and the elastic electrode plate. The vibratory electric field is effective to pop and scatter the developer on the developer carrying member from the neighborhood of the electrode plate into the developing zone, to develop the latent image on the image bearing member.

Developing apparatus producing toner powder cloud for developing images

A color image forming method, comprising the steps of: providing a particulate developer comprising at least two species of sensitive particles which are capable of respectively absorbing lights having different wavelengths to be decolorized or faded; developing an electrostatic latent image with the particulate developer to form an image comprising the developer; and exposing the developer image to light having a wavelength capable of selectively decolorizing at least one species of the sensitive particles.

Color image forming method and particulate developer for developing

An image forming apparatus including a controller for controlling the density of an image to be formed corresponding to a source of information, said controller including a detector for receiving a signal corresponding to information of image density, a corrector device for comparing the results detected by the detector with a predetermined value and correcting the image density controller in accordance with the results obtained by the comparison and image process device for forming an image having a proper density and corresponding the source of information in accordance with the image forming condition characteristics obtained after the controller has been corrected by the corrector device.

Image formation apparatus with variable density control

A process and apparatus for forming an electrostatic image on a photosensitive plate having a conductive base, a photoconductive layer overlying the base and exhibiting p-type or n-type semiconductivity, and an insulative layer overlying the photoconductive layer. The photosensitive plate is characterized in having carrier charge of a polarity corresponding to the conductivity type of the photoconductive layer injectable from the conductive base into the photoconductive layer and bound in the region of the interface between the insulative and photoconductive layers. The conductive base is transparent to activating light and the insulative layer is opaque to the activating light. A first charge of a polarity opposite to the conductivity type of the photoconductive layer is applied onto the insulative layer to inject and bind carrier charge in the region of the interface between the insulative and photoconductive layers. Then, the photoconductive layer is exposed to a pattern of activating image light by projecting the image light through the transparent conductive base while a corona discharge is applied onto the insulative layer. Thereafter, the photoconductive layer is exposed to activating light through the transparent conductive base to discharge bound carrier charge remaining in the region of the interface and form a high constrast electrostatic image.

Electrophotographic process and apparatus

Electrophotographic copying apparatus of this invention includes an electrophotographic photosensitive member, elements for forming an electrostatic latent image on the photosensitive member, and for liquid developing the latent image, and elements for removing an excess liquid developer after the development and for applying thereafter substantially uniformly an electric field on the surface of the photosensitive member with the aid, for example, of a corona discharger or an electrode. The developed image is then transferred onto a transfer material and the photosensitive member is cleaned after the transfer, wherein each of these last two functions may be accomplished by conventional elements.

Electrophotographic copying apparatus utilizing liquid developer

An A.C. corona discharging device for use in the process in which discharge and exposure are accomplished contemporaneously has insulating members disposed so as to surround the discharge wire or electrode and define the opening for projecting the image of an original. The potential gradient is increased, the discharge efficiency is improved and the flow of useless current which heretofore traveled through the shielding electrode is not encountered.

Growing community of inventors

Yokohama, Japan

Shinkichi Takahashi