Kabushiki Kaisha Toshiba

Sachiko Yasuda

Hideo Mukai

Shinya Tomura

Minoru Yoshida

Tomoyuki Asada

Masahisa Sakurada

Tomoyuji Asada

A method for developing electrostatic latent image on the surface of a photosensitive drum using one-component developer. The developer has an average particle diameter of 7-15 .mu.m. Particles of up to 5 .mu.m diameter constitutes at most 25% in the particle number distribution. Particles of no less than 20 .mu.m diameter constitute at most 5% in the particle size volume distribution. The developer particles can be sufficiently triboelectrically charged so as to prevent fogging of developed images and to obtain developer images of good quality.

Method for developing an electrostatic latent image

A method for developing electrostatic latent images on the surface of a photosensitive drum uses a one-component developer. The developer has an amount of triboelectric charge within the range of about 30-100 .mu.m c/m.sup.2, and a true specific gravity of at least about 1.2. The developer can be sufficiently moved to the electrostatic latent image so as to prevent fogging of developed images and to consistently obtain developed images of good quality.

In a developing apparatus for developing an electrostatic-latent image by applying a charged developer to the electrostatic-latent image formed on a surface of an image carrier, a housing which stores the developer has a developing roller for feeding the developer therefrom to a developing position. A developer supply roller for supplying a triboelectrically charged developer is in rolling contact with the developer roller. The developer supply roller has a conductive material, and is rotated while electrostatically holding a developer so as to charge it by friction.

Developing apparatus

In a developing apparatus for developing an electrostaticlatent image by applying a charged developer to the electrostatic-latent image formed on a surface of an image carrier, a housing which stores the developer and has a developing roller for feeding the developer therefrom to a developing position. A recovering blade for recovering a residual developer on the developer roller in the housing is urged against developer roller. The recovering blade has a conductive portion in contact with the developing roller so as not to non-uniformly or abnormaly triboelectrically charge a developer passing over it into the housing.

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Tokyo, Japan

Sachiko Yasuda