Fujitsu Corporation

Hitoshi Yoshii

Eiji Suzuki

Katsumi Sugimoto

Kenji Fuke

Kunihiko Sato

Yoshihiro Tonomoto

Katsuya Shimatsu

Keiko Tonai

Tsutomu Kawai

Shozo Tonai

Tomoaki Tanaka

Tsuneo Mizuno

Masato Matsuzuki

Yasuhiro Wakabayashi

Shigeo Ishida

Teturou Nakashima

Hideyuki Shimobuchi

Kazumi Kawabata

Yoshimi Takizawa

A developing device for developing an electrostatic latent image with a two-component developer comprises a developer container (46) including a developer-accumulating chamber (50), and a developer-agitating chamber (56) provided above the developer-accumulating chamber. A communication passage (64) is provided between the developer-agitating chamber and the developer-accumulating chamber, and is opened to the developer-agitating chamber to define an overflow opening for the developer. The device also comprises a developer-carrying body (48) provided in the developer-accumulating chamber of the developer container, and the developer-carrying body is exposed to face an electrostatic latent image carrying body, and brings the developer from the developer-accumulating chamber to a facing zone therebetween for development of an electrostatic latent image formed on the electrostatic latent image carrying body. The device further comprises a developer-lifting means (68, 68', 70) for lifting the developer, brought to the facing zone by the developer-carrying body, to the developer-agitating chamber of the developer container, and a developer-agitating means (58) for agitating the developer in the developer-agitating chamber of the developer container, a part of the developer agitated by the developer-agitating means being fed to the developer-accumulating chamber through the overflow opening and the communication passage.

Developing device for electrostatic latent image

An electrostatic recording system using a dielectric belt for conducting electrification of a sheet of paper and a transfer belt so that the sheet of paper is not wound and caught by a photoconductor drum, and a transfer voltage can be lowered so as to smoothly separate the sheet of paper from a transfer belt. The electrostatic recording system applies a voltage to only the dielectric belt at a stage before the sheet of paper 3 is attracted to the dielectric belt 10 and applies voltage to the sheet of paper 3 conveyed to the dielectric belt, and to the dielectric belt 10 while the sheet of paper and the belt are mutually superposed.

Electrostatic recording system using dielectric belt in which

In a multicolor electrostatic recording apparatus in which two or more different color toner images are superimposed by respective electrostatic recording units, each of the electrostatic recording units includes an electrostatic latent image carried, a developer for developing an electrostatic latent image formed on the carrier with a color toner, and a detector for detecting a density of the developed image on the basis of a detecting mark which is formed on the carrier as a part of the latent image and developed by the developer. A discriminator which compares the density data with an optional desired density value to discriminate whether the density data falls in an allowable range. A controller for feed-back controlling at least one parameter for determining the density of the developed image so that the density comes to be in the allowable range, when the density falls out of the allowable range. The at least one parameter is memorized as a compensating data for the density of the developed image, when the density falls in the allowable range. Thus, using the compensating data, a process using the parameter for determining the density of the developed image is carried out. The detector for detecting density includes a light emitting section and a light receiving unit.

Multicolor electrostatic recording appartus having electrostatic

Multicolor electrostatic recording apparatus and electrostatic latent

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Kato-gun, Japan

Hitoshi Yoshii