Sharp Kabushiki Kaisha Corporation

Hiroshi Onda

Hajime Horinaka

Tetsuya Inui

Yorishige Ishii

Hirotsugu Matoba

Susumu Hirata

Shingo Abe

Masaharu Kimura

Hisashi Yoshimura

Hiroshi Ishii

Syohji Tomita

Yoshiaki Akazawa

Norihiro Ochi

Kohji Tsurui

Yoshinori Yamamoto

Satoshi Ogawa

Takashi Mukai

Yoritaka Tsubaki

Takeshi Wakabayashi

Atsuyuki Katoh

Toshio Nishino

Yasuo Imura

Yoshinobu Okumura

Saori Yamada

Masao Suzuki

Yasuhiro Shibai

Kiyoshi Toizumi

Masahiko Kubo

Toshihisa Ishida

Tohru Nishikawa

Tadayuki Sawai

Tomoko Toizumi

Michihiro Yamashita

Kouji Kida

Akio Matsumoto

Tomoya Tsutsumino

The present disclosure provides a photocatalyst filter that can efficiently decompose and eliminate ozone gas or VOC and has a low ventilation resistance. The photocatalyst filter includes a sheet-like filter substrate and a photocatalyst layer supported by the filter substrate. The photocatalyst layer exhibits a photocatalytic action by receiving light having a wavelength of 400 nm or more. The photocatalyst filter has an aperture ratio of 35% or more and 80% or less.

Exhaust unit and image forming apparatus

A toner, a developer, a two-component developer, a developing device and an image forming apparatus are provided. In the image forming apparatus, images are formed with a developer that fills a developing tank of the developing device. The developer includes the toner containing at least a binder resin, a colorant, and a release agent, the release agent having an acid value of less than 4 mgKOH/g and in which an amount of the release agent exposed on a surface of toner is 0.5% by weight or more and 2.5% by weight or less of a total amount of the toner.

Toner, method of manufacturing toner, developer, two-component developer, developing device, and image forming apparatus

A toner is so configured as to satisfy the following conditions: (b)/(a) is from 0.90 to 1.02, (a) is from 140 to 150 and the average value in the entire toner particles of a shape factor SF-2 of the toner particles is larger than 140, where (a) represents a shape factor SF-2 showing the degree of irregularity on the surface of toner particles having a particle size Dor less which is a particle size at which a cumulative volume from a large particle size side in particle size distribution by volume is 75%, and (b) represents a shape factor SF-2 of toner particles having a particle size Dor more which is a particle size at which a cumulative volume from a large particle size side in particle size distribution by volume is 25%.

Toner and producing method thereof, developer, two-component developer, developing device and image forming apparatus

In a toner at least containing a binder resin and a colorant, a value obtained by dividing a particle size Dby a particle size Dis 1.43 or more and 1.64 or less, wherein Dand Drespectively represent particle sizes at 50% and 84% of cumulative number counted from a large-size side in a cumulative number distribution. Further, in the toner, an average degree of circularity of toner particles having a volume average particle size of 1 &#x3bc;m or more and 4 &#x3bc;m or less is 0.940 or more and 0.960 or less. Further, in the toner, a content of toner particles having an average degree of circularity of 0.850 or less is 10% by number or less among the toner particles having a volume average particle size of 1 &#x3bc;m or more and 4 &#x3bc;m or less.

Toner and method of manufacturing the same, two-component developer, developing device, and image forming apparatus

A toner includes toner particles containing at least binder resin and colorant. The toner particles contain a large-sized toner particle group of particles and a small-sized toner particle group of particles having a volume average particle size smaller than that of the large-sized toner particle group. In the toner, a volume average particle size Dis 4 &#x3bc;m to 8 &#x3bc;m at 50% in accumulated volume counted from a large particle-side in accumulated volume distribution of entire toner particles; a content of toner particles contained in a toner particle group having a volume average particle size of 7 &#x3bc;m or more is 24% to 47% by volume based on the entire toner particles; and a content of toner particles contained in a toner particle group having a number average particle size of 5 &#x3bc;m or less is 10% to 50% by number or less based on the entire toner particles.

Toner, method of manufacturing the same, two-component developer, developing device, and image forming apparatus

An image forming apparatus for forming images with a toner and includes an image forming section, a paper feeding section and an image reading section, in which the non-magnetic toner is as follows: the particle size Dand the particle size Dof the toner satisfy the following formula (1), the particle size Dis from 5 to 8 &#x3bc;m, and the content of the toner particles having a particle size of at most 5 &#x3bc;m is from 15 to 35% by number:0.415&#x2266;()/&#x2266;0.475&#x2003;&#x2003;(1)wherein D, Dand Deach are a particle size where a cumulative volume from the large particle size side in the cumulative volume distribution of the toner particles reaches 10%, 50% and 90%, respectively.

Non-magnetic toner, two-component developer, and image forming apparatus

A developing device comprises a stirring rollerhaving stirring bladesfor stirring a developer, a developing rollerfor transferring the developer to an electrostatic latent image, a control memberfor controlling the amount of developer transferred from the developing rollerto the electrostatic latent image, a reflux plateby which the excess developer resulting from control by the control memberis flowed back to the stirring roller, one end portion of the reflux platebeing disposed in the vicinity of the outer periphery of the stirring roller, part of the developer stirred by the stirring rollerflying toward the reflux plate, wherein said one end portion of the reflux plateis disposed at a position remote from the stirring rollerover a distance greater then the maximum fly distance of the developer provided by rotation of the stirring roller

Developing device and image forming device

Provided is a toner not undergoing the effect of change of temperature and humidity, with high charging stability and having good fixing property and releasability. This is an electrophotographic toner containing at least a binder resin, a colorant, a charge controller and a wax in which the binder resin comprises a polyester resin having an aromatic alcohol ingredient, the charge controller comprises an organic bentonite and the wax comprises a non-polar paraffin wax.

Electrophotographic toner

A target specified range of a toner density is correctly set so that a toner density is consistently appropriately controlled. If a specified range within which a measured toner density TD (%) should fall is set based on an expression (2) below using a volume average diameter Dcav_vol (&#x3bc;m) of a magnetic carrier and a volume average diameter Dtav_vol (&#x3bc;m) of a toner, the target specified range can be correctly set, thereby making it possible to consistently appropriately control the toner density.()}&#xd7;100 &#x2003;&#x2003;(2)

Development method with controlled toner density

A device including a developing roller having a magnet roller for transporting developer, and developing an electrostatic latent image, a regulating member regulating transportation amount of the developer transported to the electrostatic latent image with the development roller, and a reflux plate refluxing excess developer regulated by the regulating member away from the regulating member is constructed to comprise a rubbing member arranged to face the developing roller, at a second gap larger than a first gap defined by the developing roller and the regulating member, and rubbing developer transported to the first gap. The rubbing member carries out preliminary electrification on developer and then the regulating member carries out main electrification on the preliminarily electrified developer.

Magnet roller developing device and image forming apparatus for reducing obstructions in developer circulation path

Flanges are pressed into opposite ends of a photoreceptor drum. A noncontact charging roller is arranged so as to face, but have no direct contact with, the photoreceptor drum. On both end portions of the noncontact charging roller, spacers are provided for maintaing a gap between the photoreceptor drum and the noncontact charging roller. The spacers are of tape form and wound around the noncontact charging roller. Winding positions of the spacers are distant by more than an effective projection length of each of the flanges from respective opposite ends of the charging roller.

Image forming apparatus having non-contact charging roller

The present removing system has a feature to remove a left-over toner that is accumulated on a brush that touches a left-over toner on a photoreceptor. More specifically, the present removing system is so arranged that an alternating voltage (superimposing voltage) on which a positive direct current voltage is superimposed is applied onto a conductive brush in accordance with a user's instruction. With this arrangement, even if a positively electrified left-over toner is accumulated on the conductive brush, it is possible to remove the positively electrified left-over toner accumulated on the conductive brush, because a voltage value (positive) applied on the conductive brush in a moment is large. Moreover, because a voltage of the conductive brush becomes negative in a moment, it is possible to remove a negatively electrified left-over toner attached on the conductive brush.

Foreign material removing system, method of removing foreign material, printing apparatus and printing method

A method of fabricating a recording head is disclosed in which a needle-type control electrode is formed integrally with the substrate. The method includes steps of forming on a substrate a first member layer having a pattern such that the substrate is partially exposed. Forming a second member layer spanning a portion of the exposed substrate and a portion of the first member layer. Then, a needle-type member is formed from the second member layer. Finally, the basic portion of the recording head is completed just by joining the substrate and an overhead plate. Thus, there is no need to join the needle-like control electrode with the substrate. There is no need to position members having critical dimensions with each other.

Method of fabricating a recording head of electrostatic attraction type image recording apparatus

An ink jet print head by which ink droplet ejected from all orifices are adapted to have uniform size has the following structure. Each of a plurality of ink chambers divided by partitions is communicated with a common pressure chamber with a first filter interposed. Common pressure chamber is communicated with a common ink feed path with a second filter interposed. Common pressure chamber and each of the ink chambers are covered by a pressure chamber ceiling. On pressure chamber ceiling, a piezo vibrator is provided at a position corresponding to common pressure chamber. A movable wall which is bent and deformed to the side increasing the volume is provided corresponding to each partition. By driving a piezo vibrator, a pressure wave is generated in common pressure chamber, which wave is transmitted to each ink chamber through the first filter. When movable wall is bent and deformed, the pressure wave is absorbed, so that an ink droplet is not ejected. When movable wall is not deformed, ink droplet is ejected because of the pressure wave.

Ink jet printerhead with a plurality of nozzles and two distinct groups of filters

An ink jet recording method includes the steps of: causing ink drops to fly from a recording head; attaching the ink drops onto an intermediate transfer element at a recording density of no less than 140 dots/cm.times.140 dots/cm and an amount of ink attached of no more than 3.0.times.10.sup.-4 ml/cm.sup.2 ; and transferring an image formed on the intermediate transfer element onto a recording medium.

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Yamatokoriyama, Japan

Hiroshi Onda