Kyocera Document Solutions Inc.

Kyocera Mita Corporation

Kyocera Mita Coporation

Masahito Ishino

Masaki Kadota

Yoshitaka Imanaka

Tomohiro Tamaki

Takahisa Nakaue

Hiroka Itani

Shinki Miyaji

Toshiki Fujita

Minoru Wada

Masaru Hatano

Kiyotaka Kobayashi

Jun Nakai

Nariaki Tanaka

Sueaki Okamoto

Eiji Gyotoku

Kotatsu Kawaguchi

Keisuke Isoda

Yukari Ota

Atsushi Ishizaki

Teppei Shibuya

Hiroaki Watanabe

Keiya Nishimura

Akira Matayoshi

Ikuo Makie

Chikara Ishihara

Norio Tomiie

Katsuya Ota

Motoki Moriguchi

Yoshinori Horiuchi

Mitsunobu Honda

Akane Tokushige

Ayaka Kondo

Yuki Matsui

A developing device includes a development container, a developer carrying member, and a regulation blade. The development container is for containing a non-magnetic one-component developer composed only of the toner. The developer carrying member is manufactured by a polishing method and includes a rotary shaft and a roller portion stacked on an outer circumferential surface of the rotary shaft, and a toner layer is formed on the roller portion. The regulation blade contacts the outer circumferential surface of the roller portion so as to regulate a thickness of the toner layer. When ten-point average roughnesses in a circumferential direction and in an axial direction of the roller portion are indicated as Rz1 and Rz2, respectively, Rz1/Rz2≤1.5 is satisfied, and a contact linear pressure of the regulation blade with respect to the roller portion is not less than 15 [N/m] and not more than 40 [N/m].

Developing device of a non-magnetic one-component development type capable of suppressing toner melt adhesion to a regulation blade and image forming apparatus including the same

An image forming apparatus includes an image carrying member, a charging device, an exposure device, a developing device, a control section, and a temperature detecting device. The developing device includes a developer carrying member having an outer circumferential surface on which a toner layer is formed, and a regulation blade that regulates a thickness of the toner layer. The control section executes speed reduction control to reduce a rotation speed of the developer carrying member at a time of warming-up. When a printing operation to be performed after the warming-up is intermittent printing and an interval of the intermittent printing is not less than a prescribed time or a temperature detected by the temperature detecting device is not more than a prescribed temperature, the control section reduces the rotation speed of the developer carrying member in the speed reduction control to a second speed lower than the first speed.

Image forming apparatus capable of executing speed reduction control of system linear speed at time of warming-up

An image forming apparatus includes an image carrying member, a charging device, an exposure device, a developing device, and a control section. The developing device includes a development container for containing a non-magnetic one-component developer composed only of a toner, a developer carrying member having an outer circumferential surface on which a toner layer is formed, and a regulation blade that regulates a thickness of the toner layer. The control section executes speed reduction control to reduce a rotation speed of the developer carrying member at a time of warming-up before image formation to a first speed lower than a reference speed at a time of the image formation. In the speed reduction control, the control section raises the rotation speed of the developer carrying member at a first acceleration rate until the first speed is reached from a state where rotation of the developer carrying member is stopped.

An image forming apparatus includes an image carrying member, a charging device, an exposure device, a developing device, a development voltage power supply, and a control section. The developing device includes a development container for containing a non-magnetic one-component developer composed only of a toner, a developer carrying member having an outer circumferential surface on which a toner layer is formed, and a toner supply member that supplies the toner to the developer carrying member. The control section performs control so that, as a cumulative drive time of the developing device increases, a supply voltage Vsdc becomes larger than a reference supply voltage and a development voltage Vdc becomes smaller than a reference development voltage, thus executing control to vary the development voltage Vdc and the supply voltage Vsdc so as to increase a potential difference Vsdc−Vdc between the supply voltage Vsdc and the development voltage Vdc.

Image forming apparatus having controller to control potential bias applied between developing roller and supply roller according to cumulative drive time

An image forming apparatus includes an image bearing member, a charger, a light exposure device, a development device, a transfer belt, a primary transfer device, a secondary transfer device, and a cleaning member. The cleaning member is pressed against a circumferential surface of the image bearing member and collects residual toner remaining on the circumferential surface of the image bearing member as a result of primary transfer of a toner. The transfer belt has a surface resistivity of at least 6 Log &#x3a9; and no greater than 11 Log &#x3a9;. A linear pressure of the cleaning member on the circumferential surface of the image bearing member is at least 10 N/m and no greater than 40 N/m. The image bearing member includes a conductive substrate and a photosensitive layer of a single layer. The image bearing member satisfies formula (1): 

Image forming apparatus and image forming method

An image forming apparatus includes an image carrier, a charger, an exposure device, a development device and a pressing mechanism. The developer carrier is pressed on the image carrier with a predetermined pressing force to form a nip area between the roller part and the image carrier. A roller part of the developer carrier has an Asker C hardness of 65&#xb0; or more and 73&#xb0; or less. When the pressing force is set to X (N) and a width of the nip area in a circumferential direction of the image carrier is set to Y (&#x3bc;m), 3.0&#x2264;X&#x2264;8.0 and 550&#x2264;Y&#x2264;700, and the following expressions (1) and (2) are satisfied, 

Image forming apparatus

An image forming apparatus includes an image carrier, a charger, an exposure device, a development device and a pressing mechanism. When a developer carrier and the image carrier are rotated in a state where a film is held in a development nip area and then a pulling force of the film is measured, a maximum value MAX, a minimum value MIN, and an average value X of the pulling force satisfy the expressions (1) and (2). When a development voltage applied to the developer carrier is set to Vdc, the surface potential of the image carrier is set to V0, and the surface potential of the image carrier after exposure is set to VL, the expressions (3) and (4) are satisfied.&#x2264;MAX&#x2264;1.5&#x2003;&#x2003;(1),0.5&#x2264;MIN&#x2264;&#x2003;&#x2003;(2),0&#x2212;&#x2265;2()&#x2003;&#x2003;(3) and&#x2265;100&#x2003;&#x2003;(4).

Image forming apparatus capable of suppressing a white void in an image and a cleaning failure in a non-magnetic one component development device

A development device includes a development housing, a development roller, a supply roller and a layer thickness regulating member. The development housing stores a nonmagnetic one-component toner. The development roller is formed by a cylindrical elastic body, and moves in a same direction as a rotational direction of a rotatable photosensitive drum at a development nip area while coming into contact with the photosensitive drum. The supply roller is formed by a cylindrical elastic body, and supplies the toner to the development roller and collects the toner from the development roller. The development roller has a surface free energy within a range of 5 mJ/mor more and 27 mJ/mor less.

Development device and image forming apparatus including the development device

An image forming apparatus includes an image bearing member and a charging roller that charges a circumferential surface of the image bearing member to a positive polarity. The image bearing member includes a conductive substrate and a photosensitive layer of a single layer, and satisfies formula (1) shown below. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. In formula (1), Q represents a charge amount [C] of the circumferential surface of the image bearing member, S represents a charge area [m] of the charged circumferential surface of the image bearing member, d represents a film thickness [m] of the photosensitive layer, co represents vacuum permittivity [F/m], and V represents a value calculated in accordance with formula V=V&#x2212;V.

In an image forming apparatus, a cleaning member is pressed against a circumferential surface of an image bearing member and collects a toner remaining on the circumferential surface of the image bearing member. The toner has a number average roundness of 0.965 to 0.998. The toner has a Dof 4.0 &#x3bc;m to 7.0 &#x3bc;m. A linear pressure of the cleaning member on the circumferential surface of the image bearing member is 10 N/m to 40 N/m. The image bearing member includes a single-layer photosensitive layer containing a charge generating material and a hole transport material. Ionization potential Ipof the hole transport material and ionization potential Ipof the charge generating material satisfy mathematical formula (1) 'Ip&#x2265;5.30 eV', mathematical formula (2) 'Ip&#x2265;5.30 eV', and mathematical formula (3) &#x201c;0.09 eV&#x2264;|Ip&#x2212;Ip|&#x2264;0.30 eV&#x201d;.

An image forming apparatus includes an image bearing member and a charging roller that charges a circumferential surface of the image bearing member to a positive polarity. The image bearing member includes a conductive substrate and a photosensitive layer of a single layer, and satisfies formula (1) shown below. The charging roller includes a conductive shaft, a base layer covering a surface of the conductive shaft, and a surface layer covering a surface of the base layer. In formula (1), Q represents a charge amount of the circumferential surface of the image bearing member. S represents a charge area of the circumferential surface of the image bearing member. d represents a film thickness of the photosensitive layer. &#x3b5;represents a specific permittivity of a binder resin contained in the photosensitive layer. &#x3b5;represents a vacuum permittivity. V represents a value calculated according to formula (2) V=V&#x2212;V.

An image forming apparatus includes an image bearing member and a static elimination device. The static elimination device irradiates static elimination light onto a circumferential surface of the image bearing member. The image bearing member includes a conductive substrate and a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The static elimination light has a wavelength of at least 600 nm and no greater than 800 nm. The photosensitive layer has an optical absorption coefficient of at least 600 cmand no greater than 1,500 cmwith respect to light having a wavelength of 660 nm.

An image forming apparatus includes an image bearing member, a charger, and a cleaning member. The charger charges a circumferential surface of the image bearing member to a positive polarity. The cleaning member is pressed against the circumferential surface of the image bearing member and collects a toner remaining on the circumferential surface of the image bearing member. A linear pressure N of the cleaning member on the circumferential surface of the image bearing member is at least 14 N/m and no greater than 40 N/m. A rebound resilience R of the cleaning member at a temperature of 25&#xb0; C. is at least 38%. The leaner pressure N and the rebound resilience R satisfy mathematical formula (1A). The image bearing member satisfies mathematical formula (1B). 

An image forming apparatus () includes an image bearing member (), a charging section (), a developing section (), and a cleaning member (). The image bearing member () contains filler particles (). The charging section () is either in contact with or positioned close to the image bearing member () and is configured to electrically charge the image bearing member () by generating a proximity discharge between the charging section () and the image bearing member (). The developing section () supplies toner to the circumferential surface of the charged image bearing member (). The cleaning member () has a degree of hardness equal to or higher than 65&#xb0; and a degree of impact resilience equal to or lower than 30%. The cleaning member () is brought into pressure contact with the circumferential surface of the image bearing member () being rotated, by applying linear pressure equal to or higher than 15 gf/cm.

Image forming apparatus, developer used thereby, and image forming method

An image forming apparatus () includes a photosensitive drum (), a cleaning blade (), and a drive mechanism (). The cleaning blade () is in pressed contact with a circumferential surface of the photosensitive drum (). The drive mechanism () causes one of the photosensitive drum () and the cleaning blade () to reciprocate in a rotational axis direction (D) of the photosensitive drum (). The drive mechanism () for example causes the photosensitive drum () to reciprocate in the rotational axis direction (D). The photosensitive drum () includes a photosensitive layer (). An outermost layer of the photosensitive layer () contains a plurality of particles.

Image forming apparatus that causes one of cleaning member and image bearing member including photosenstive layer to reciprocate and image forming method

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Osaka, Japan

Masahito Ishino