Konica Minolta, Inc.

Hokuto Hatano

Kuniaki Kashiwakura

Takeshi Ishida

Tsugihito Yoshiyama

Yoshiki Nakane

Yohei Ito

Kazunori Kurimoto

Kazuhiro Saito

Shunichi Takaya

Seisuke Maeda

Masahiko Kurachi

Noritoshi Hagimoto

Hiroki Takao

Eri Kusano

An image forming apparatus includes: an image carrier; a solid lubricant; a lubricant application member that scrapes off the solid lubricant and applies the scraped solid lubricant to a surface of the image carrier; a colorimeter that performs colorimetry of a colorimetric surface of the solid lubricant; and a hardware processor that sets a lubricant application condition such that a predetermined amount of lubricant is applied on the basis of a colorimetric result obtained by the colorimeter.

Image forming apparatus

An image forming apparatus includes: an image carrier; a charging roller that charges the image carrier; a power supply part that applies a charging voltage to the charging roller; a current measurement part that measures a value of a DC component of a current flowing between the image carrier and the charging roller at at least two timings having mutually different elapsed times; and a hardware processor that measures an elapsed time from a start of application of the charging voltage by the power supply part, calculates a coefficient of an approximate expression indicating a relationship between the value of the DC component of the current flowing between the image carrier and the charging roller, and the elapsed time, and performs judgment related to life of the charging roller on the basis of the coefficient and a predetermined threshold.

Image forming apparatus, image forming apparatus control method, and image forming apparatus control program

A charging device is configured to apply electric charge to an image carrier provided outside the charging device. The charging device includes: a cored bar member; and a conductive resin layer provided on a surface of the cored bar member. The conductive resin layer has a film thickness of 200 &#x3bc;m or less. Filtered maximum waviness in an axial direction of the cored bar member is 8 &#x3bc;m or less in a range of a reference length of 60 mm.

Charging device and image forming apparatus

An image forming apparatus includes a photoreceptor, a charging unit, an exposing unit, a developing unit, a transfer unit, a lubricant supply unit, a cleaning unit and a lubricant removal unit. The lubricant supply unit supplies a lubricant to a surface of the photoreceptor and is disposed at a point which is an upstream side of the cleaning unit and a downstream side of the developing unit in a rotation direction of the photoreceptor. The lubricant removal unit removes the lubricant from the surface of the photoreceptor and is disposed at a point which is the downstream side of the cleaning unit and the upstream side of the developing unit in the rotation direction of the photoreceptor.

Disclosed is an electrophotographic photoreceptor including a conductive support, a photosensitive layer on the conductive support and a surface layer on the photosensitive layer. The surface layer includes a cured resin prepared by polymerization of a compound having two or more radically polymerizable functional groups per molecule, the cured resin containing an organic resin fine particle and a metal oxide fine particle, and the organic resin fine particle comprising a resin containing a structural unit derived from at least one of melamine and benzoguanamine, the organic resin fine particle having a number average primary particle size of 0.01 to 3.00 &#x3bc;m.

Electrophotographic photoreceptor, manufacturing method of electrophotographic photoreceptor, image-forming apparatus and image-forming method

To provide an image forming apparatus that suppresses occurrence of image deletion in a high-temperature and high-humidity environment and provides good toner cleanability. Provided is an image forming apparatus including a photoreceptor having a protective layer containing a crosslinked polymer as a surface layer, wherein, along with the rotation direction of the photoreceptor in the external area of the rotating photoreceptor, a lubricant supplying part that supplies lubricant onto the surface of the photoreceptor, a charging part that charges the surface of the photoreceptor by a charging roller, an exposure part that exposes the charged photoreceptor by the charging part, a developing part that supplies toner to the exposed photoreceptor by the exposure part to form a toner image, a transfer part that transfers the toner image formed on the photoreceptor, a cleaning part that removes the toner remained on the surface of the photoreceptor and a lubricant removing part that removes the lubricant adhered on the surface of the photoreceptor are sequentially disposed.

Image forming apparatus having photoreceptor with lubricant supplying part and lubricant removal part

In an image forming apparatus, the charging bias supply circuit generates a second charging bias voltage that causes no positive discharge between the charging unit and the photoreceptor drum, during a recovery mode, the charging unit charges the surface of the photoreceptor drum upon application of the second charging bias voltage during the recovery mode, and the cleaning unit rubs the surface of the photoreceptor drum charged by the second charging bias voltage, during the recovery mode.

Image forming apparatus with a charging bias supply circuit

Fiber bundle forms loops protruding beyond a surface side of a base member with constant spaces therebetween, in at least one of opposite ends located in a direction perpendicular to a weaving direction (W) of a ribbon brush, a weft extending between neighboring loops passes under a warp, and a weft extending through the loop passes above the warp.

Loop brush roller and image forming apparatus

A cleaning blade, which is configured to be pressed against a toner image carrier that rotates in one direction, for removing residual toner from the toner image carrier, the cleaning blade having: a contact layer that is located in a side to come into contact with the toner image carrier; and a supporting layer that is located in a side not to come into contact with the toner image carrier, wherein tensile stress characteristic curves of a material of the contact layer and a material of the supporting layer intersect with each other. An image forming apparatus having a toner image carrier and the cleaning blade.

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Hachioji, Japan

Hokuto Hatano