Patent application number | Description | Published |
20090080940 | Developer, developer cartridge, image forming unit and image forming apparatus - A developer is produced by a process including mixing at least a binder resin and internal additive particles. The internal additive particles have diameters in a range from 15 μm to 212 μm. The internal additive particles have higher melting point than the binder resin. | 03-26-2009 |
20090185836 | Developer, developer storage unit, developing device, and image forming apparatus - Developer includes toner formed of base particles containing at least a binder resin. The base particles have surfaces coated with an additive agent, and the toner has a volume average particle size between 3.9 μm and 6.1 μm. The developer further includes agglomerates in an amount between 0.01 wt % and 0.10 wt %. The agglomerates have a volume average particle size between 75 μm and 100 μm. | 07-23-2009 |
20090190957 | Image forming apparatus - An image forming apparatus includes a plurality of developing devices. Each developing devices performs an electrophotographic process to form an image. The image forming apparatus comprises a first developing device and a second developing device. The first developing device holds a black developer containing a first black coloring agent. The second developing device holds a gray developer. The gray developer contains a second black coloring agent and a coloring agent of a chromatic color. The chromatic color is a complementary color to the second black coloring agent. | 07-30-2009 |
20090317144 | Image forming unit and image forming apparatus - An image forming unit includes a developer bearing body that supplies a developer to an image bearing body that bears a latent image, and a developer layer forming member that forms a layer of the developer on the developer bearing body. The developer has a mean volume diameter in a range from 3.0 to 5.0 μm, and a bulk density in a range from 0.26 to 0.32 g/cm | 12-24-2009 |
20100232850 | Image forming unit and image forming apparatus - An image forming unit includes an image bearing body on which a latent image is formed, a charging member that charges the image bearing body, a developer bearing body that develops the latent image on the image bearing body using a developer so as to form a developer image, a transfer portion that transfers the developer image to a medium, a cleaning member that removes an adhering matter adhering to part of the image bearing body after the part of the image bearing body passes the transfer portion, a collection roller provided so as to form a contact portion between the collection roller and the image bearing body and is located between the cleaning member and the charging member, and a collection roller power source that applies a voltage to the collection roller. The voltage has the same polarity as a polarity of the developer. | 09-16-2010 |
20110052288 | CLEANING DEVICE AND IMAGE FORMING APPARATUS - A cleaning device includes a developer removal member, a support member and a fixation member. The developer removal member is in contact with an adherend to which developer adheres and removes the developer from the adherend. The support member has a first end where a bent portion is formed and a second end opposite to the first end. The support member also supports the developer removal member in the vicinity of the bent portion. The fixation member holds the second end of the support member. | 03-03-2011 |
20110103841 | Developer, developer cartridge, developing unit, and image forming apparatus - A developer contains a resin, a coloring agent, and an external additive in an amount of 2.5 to 4.5 weight parts added to the resin in an amount of 100 weight parts resin. The developer has an average volume mean particle diameter in the range of 4.5 to 6.5 μm and a BET specific surface in the range of 2.45 to 3.74 m | 05-05-2011 |
20110135360 | IMAGE FORMING UNIT AND IMAGE FORMING DEVICE - An image forming device includes a plurality of image forming units each including a developer carrier that carries developer; an image carrier that forms a developer image on a surface layer with the developer supplied from the developer carrier; and a developer collector that is positioned to contact the surface layer of the image carrier and that removes residual developer after transferring the developer image formed on the surface layer onto a recording sheet. Wherein the developer collector in a first image forming unit has a higher linear contact pressure against the surface layer of the image carrier than that of other image forming units, and a thickness of the surface layer of the image carrier of the first image forming unit is greater than a thickness of the image carrier of the other image forming units. | 06-09-2011 |
20120087697 | IMAGE FORMING APPARATUS THAT INCLUDES A FIRST DEVELOPING DEVICE THAT HOLDS A BLACK DEVELOPER AND A SECOND DEVELOPING DEVICE THAT HOLDS A GRAY DEVELOPER - An image forming apparatus includes a plurality of developing devices. Each developing devices performs an electrophotographic process to form an image. The image forming apparatus comprises a first developing device and a second developing device. The first developing device holds a black developer containing a first black coloring agent. The second developing device holds a gray developer. The gray developer contains a second black coloring agent and a coloring agent of a chromatic color. The chromatic color is a complementary color to the second black coloring agent. | 04-12-2012 |
20130078001 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first image forming unit configured to form a white developer image on a recording medium using a white developer, at least one second image forming unit configured to form at least one single-color developer image on the recording medium using at least one single-color developer other than the white developer, and a fixing unit configured to fix the white developer image and the at least one single-color developer image to the recording medium so as to form a white image and at least one single-color image. A haze value of the white image is higher than a haze value of each of the at least one single-color image. | 03-28-2013 |
20130230342 | IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS - An image forming unit includes a developer bearing body that bears a developer, and a supplying member provided so as to face the developer bearing body. The supplying member rotates to thereby collect the developer from the developer bearing body and supply the developer to the developer bearing body. The image forming unit further includes a developer storage portion that stores the developer to be supplied to the supplying member, and a charge providing member that charges the developer held on the supplying member. In a rotating direction of the supplying member, the charge providing member is disposed on a downstream side of an opposing portion between the developer bearing body and the supplying member and on an upstream side of a region where the developer storage portion supplies the developer to the supplying member. | 09-05-2013 |