Minolta Camera Kabushiki Kaisha

Osamu Miyamoto

Isao Iizaka

Toshio Yamamoto

Takashi Hikosaka

Sanji Inagaki

Koji Nagai

Hiromi Kameda

Shigemitsu Shimizu

Shigemitu Shimizu

A method of developing latent electrostatic images comprising the steps of stirring a developer containing toner particles and carrier granules to triboelectrically charge the toner particles to a polarity suitable for developing a latent electrostatic image on an image bearing surface, causing the latent electrostatic image on the surface to electrostatically attract toner particles in the stirred developer to convert the latent image to a visible image and replenishing the developer used for the development and containing a reduced quantity of toner particles with toner particles different in triboelectric chargeability (capability of being triboelectrically charged by frictional contact with carrier granules) from the toner particles initially contained in the developer before the development.

Electrographic magnetic developing method

An electrostatic latent image transfer type copying apparatus which has a photoconductive member, a system for forming an electrostatic latent image on the photoconductive member, an image transfer system for conducting transfer material having an insulating dielectric layer coated over an electrically conductive layer into contact with the photoconductive member for transferring the latent image onto said transfer material, a transporter for the transfer material to transport it along a predetermined path to the image transfer system, a member such as a relatively sharp edge member like a cutter provided along the path and below which the insulating dielectric layer side of the transfer material passes, and an insulating member provided adjacent the sharp edge member for preventing the surface of transfer material from contacting the sharp edge member as the transfer material is transported, whereby the contact of the sharp edge member with the surface of transfer material which causes frictional charging on the transfer material is substantially prevented.

Electrostatic latent image transfer type copying apparatus

A liquid type developing apparatus includes a developing liquid chamber containing a developing liquid comprised of toner and an organic solution. A recording sheet having an electrostatic latent image on its surface passes between a pair of upper and lower electrically conductive electrode members arranged so that at least one of such members contacts the developing liquid. An electric power source is connected to one of the electrode members for impressing a bias voltage thereto, such one member being arranged in non-contacting relationship with the chamber, and the other of such members being arranged in electrically conductive relationship with the tank, whereby any leakage of the impressed voltage due to attraction of the toner to the members, the tank or to bearings provided for the members, is substantially avoided.

Liquid type developing apparatus

At least one roller in a plurality of paired electrode rollers positioned in a liquid developer is electrically isolated from its associated electrode roller for development of the image on a copying sheet during the time in which the copying sheet is transported by the paired conductive rollers to eliminate fogging and whitening of the copied image.

Electrode conductive roller developing device

Apparatus for improving the quality of images obtained in an electrostatic latent image transfer type copier according to which there are provided electrical circuits permitting escape or neutralization of charges which may be produced in copy paper during its transport through a photocopying machine and could cause smudging or elimination of required image portions in developed copy paper carrying the image of a document or similar material. In the disclosed embodiment, the electrical circuits maintain each of the rollers of pairs of copy sheet transporting rollers at an equal potential.

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Toyokawa, Japan

Osamu Miyamoto