Ricoh Company, Ltd.

Maiko Koeda

Takamasa Hase

Yuusuke Furuichi

Emi Kita

Koichi Kato

Kiyonori Tsuda

Koichi Sakata

Junichi Terai

Keiko Matsumoto

Satoru Miyamoto

Tetsuro Suzuki

Toshiyuki Kabata

Nozomu Tamoto

Tatsuya Niimi

Takayuki Shimizu

Hiroki Kobayashi

Hideki Sugiura

Hiroshi Seo

Katsunori Kurose

Yuki Oshikawa

Masayuki Koyano

Takashi Bisaiji

Kohichi Utsunomiya

Mugijirou Uno

Katsuichi Ohta

Masahiko Ishikawa

Takuzi Yoneda

Yuuki Mizutani

Mio Kumai

Azumi Miyaake

Kentaroh Tomita

Ayano Momose

Takehiko Kinoshita

Mihoko Matsumoto

Yuri Haga

Hiroki Nakane

Suzuka Nozoe

Kaori Miyahara

A toner including base particles and external additives on the base particles, the toner satisfying Conditions 1 and 2 defined in the specification, when a number distribution D of particle diameters of powder particles B generated from one base particle A is calculated from a density a of the base particles A and a density b of the powder particles B, where the base particles A and the powder particles B are deposited on an adhesive area and mica respectively by feeding the toner into a vacuumed space from an inlet, and allowing the toner to crush against a surface of a substrate having the adhesive area composed of a carbon tape, and the mica disposed in a manner that the surface is orthogonal to a direction connecting between center of the vacuumed space and center of the inlet, Powder particles B: particles detached from the base particles.

Toner, toner stored unit, image forming apparatus, and image forming method

An active-energy-ray-curable composition, a cured material of the active-energy-ray-curable composition satisfying a critical load of 5.0 g or more but 25.0 g or less, the critical load being obtained by a continuous loading test method using a variable normal load friction and wear measurement device, the cured material having an average thickness of 10 &#x3bc;m and being formed by coating the active-energy-ray-curable composition on a substrate and by irradiating and curing the active-energy-ray-curable composition with active energy rays having illuminance of 1.5 W/cmand an amount of irradiation of 200 mJ/cm.

Active-energy-ray-curable composition, active-energy-ray-curable ink, two-dimensional or three-dimensional image forming method, two-dimensional or three-dimensional image forming apparatus, and cured material

A method for loading a replenishment developer into a developer accommodating container such that when the replenishment of the replenishment developer inside the loaded developer accommodating container is started, the developer composed of a toner and a carrier, or a toner is discharged from a developer discharge port of the developer accommodating container, wherein when a premix toner that is a replenishment developer composed of a replenishment toner and a replenishment carrier is loaded into a toner bottle serving as the developer accommodating container, the replenishment carrier is loaded and then the replenishment toner is loaded.

Developer loading method, loaded developer accommodating container, developer replenishment device, and image forming apparatus

A developing device capable of conveying discharged developer to the outside of the device well by preventing developer from firmly adhering within a discharge conveyance path, as well as an image forming apparatus and a process cartridge having this developing device. A developing device, having: a developing roller; a developer conveyance path having a supply screw and a supply conveyance path; a toner replenishment controller for replenishing the developer to the developer conveyance path; a discharge conveyance path for conveying the developer to the outside of the developing device; a discharge screw serving as a discharge conveying member for applying a conveying force to the developer within the discharge conveyance path; and a developer discharge port serving as developer discharge means for discharging the developer to the discharge conveyance path, wherein the conveying force is applied to the discharged developer intermittently by the discharge screw serving as a discharge conveying member, whereby a shock is applied intermittently to the discharged developer within the discharge conveyance path.

Developing device, image forming apparatus and process cartridge in which a shock is applied intermittently to the discharged developer

A developer supply system includes a container, a memory, and a positioning mechanism. The container has a deformable bag formed of flexible material to accommodate developer therein. The memory is attached to a given planar surface of the deformable bag to store information for communication to the image forming apparatus. The positioning mechanism holds the container therein while maintaining the given planar surface in position relative to the image forming apparatus when the deformable bag collapses as it discharges developer. An image forming apparatus employing such a developer supply system is also disclosed.

Developer supply system and image forming apparatus incorporating same

An image forming apparatus including an image bearing member; a developing device forming a toner image; a toner supplying device including a toner container, a toner feeding passage, a pump, in which a first member is moved while rubbing a second member to feed a developer supplement including at least the toner, and a residual toner detector detecting the amount of the developer supplement remaining in the toner container. Even after the toner container achieves a near empty state, image forming operations are continued as long as a predetermined condition is satisfied while changing the pump's condition such that the pump is stopped, the ratio of the pump stopping period to the pump driving period is set to be greater than that before the near-empty detection, or the pump stopping period and the pump driving period are set to be longer than those before the near-empty detection.

Image forming apparatus

A developing device and image forming apparatus that can satisfy stability over time in relation to amount of developer carried, and prevent developer retention, deterioration of developer and developing sleeve adhesion, wherein the amount of developer carried per unit area on the developer carrier in the developing region is 30 mg/cmto 60 mg/cm; the weight mean particle diameter of the toner is 4.5 &#x3bc;m to 8.0 &#x3bc;m; the ratio Dw/Dn of the toner weight mean particle diameter (Dw) and the number mean particle diameter (Dn) is 1.20 or less; an irregular roughness pattern having the maximum height Rz of the surface roughness of 20 to 40 &#x3bc;m and the mean space Sm of the roughness of 100 to 200 &#x3bc;m is formed on the surface of the developer carrier; and the relationship between the developing gap PG and the gap DG between the developer restricting member and the developer carrier is 1.0&#x2266;(DG/PG)&#x2266;3.0.

Developing device and image forming apparatus comprising the same

An electrophotographic photoreceptor, including:

Electrophotographic photoreceptor, and image forming apparatus and process cartridge therefor using the electrophotographic photoreceptor

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Shizuoka, Japan

Maiko Koeda