Sharp Kabushiki Kaisha Corporation

Panasonic Corporation

Toru Nishikawa

Tadayuki Sawai

Takeshi Kato

Hitoshi Nagahama

Junichi Saito

Takafumi Nagai

Toshihisa Ishida

Yoshimi Kojima

Takahiro Bito

Akihiko Kawahara

Masaya Tateyanagi

Kouji Kida

Isao Hayami

Kazuya Korematu

Kazuki Takatsuka

Kazuya Korematsu

Syouichi Tanaka

An image forming apparatus of the present invention is an image forming apparatus into which a memory device is insertable and which performs a printing process on an image of image data stored in the memory device. The image forming apparatus includes a memory reading section for detecting insertion of the memory device into the image forming apparatus, and a display processing section for performing a notification process of warning of accidental ingestion of the memory device, when the memory reading section detects the insertion of the memory device. This makes it more surely possible to cause a user to give attention to accidental ingestion by young children.

Image forming apparatus, image forming system, storage medium, and control method including recommendation information writing

A carrier and a two-component developer are provided. A coating resin layer for coating a core material contains fine particles of titanium oxide which comprise an anatase-type crystal and a rutile-type crystal, and a carrier coating amount of the coating resin layer falls in a range of from 5% by weight to 20% by weight. In addition, a content rate of the rutile-type crystal falls in a range of from 5% to 20% on the basis of the total amount of crystal, and the weight of the fine particles of titanium oxide falls in a range of from 5% by weight to 50% by weight relative to the weight of the core material. Further, the primary particle size of the fine particles of titanium oxide falls in a range of from 40 nm to 80 nm.

Carrier and two-component developer

A tester according to the present invention can conduct a test on optical devices each having a different positional relation between a position of a contact face of an external contact terminal and a direction of light emitted from a semiconductor laser element.

Device for testing a light-emitting optical device using a socket

A non-magnetic single component developing device that is included in combination with a photoreceptor in an image forming apparatusof the electro-photographic system. The non-magnetic single component developing device includes a developing roller, a supplying roller, a doctor, a toner bath and a stirring blade. The supplying roller contains a rubber foam at least in its surface layer portion, the rubber foam including closed cells and open cells and having a foam ratio (porosity) of 0.75 to 0.85 and an average foam cell diameter of 350 to 500 &#x3bc;m.

Non-magnetic single component developing device

A non-magnetic mono-component toner of the present invention is composed of a coloring powder at least containing a binder resin, coloring agent and wax and at least one kind of external additive having a mean particle diameter of 0.04 &#x3bc;m or greater, wherein the relationship between the Vickers hardness of the above coloring powder and the mean particle diameter of the external additives satisfies the predetermined expression. Thereby, the present invention is effective in preventing the external additive particles from sinking into the toner surface as well as from falling off from the surface when the toner particles are stressed in the developing unit. As a result, it is possible to provide stable image quality free from degradation of toner charge performance and toner supply performance even for long-term use.

Non-magnetic mono-component toner and developing method with the same

Growing community of inventors

Yamatokoriyama, Japan

Toru Nishikawa