Oki Data Corporation

Oki Electric Industry Co., Ltd.

Hideharu Kuwabara

Shin Yamada

A drum unit including a photosensitive drum may satisfy an equation of ΔV≤0.489×Q−0.014 (%), where ΔV={1−(V1/V0)}×100 (%). V0 is a surface potential of the photosensitive drum that is measured under a first condition that exposes a surface of the photosensitive drum at an exposure amount Q in a range of 0.13 to 0.34 μJ/cm2 while the photosensitive drum is rotated at a circumferential speed of 151 mm/s with the surface of the photosensitive drum being charged with a voltage having 1000 volts and a first polarity. V1 is a surface potential of the photosensitive drum that is measured under the first condition again after the surface of the photosensitive drum is applied for 406 seconds with a voltage having 2850 volts and a second polarity while the photosensitive drum is rotated at the circumferential speed of 73 mm/s.

Drum unit and image formation apparatus

A toner container used in an image forming apparatus including an exposure unit with a light emitting diode light source. The toner container including a container body, and a cyan toner stored in the container body. The cyan toner includes a binder resin, at least one pigment, a charge control agent, and an external additive. The at least one pigment includes at least Pigment Blue. A lightness L*, a hue a*, and a hue b* of the cyan toner in a powder state satisfy: 30.04&#x2264;L*&#x2264;33.68, &#x2212;1.75&#x2264;a*&#x2264;0.71, and &#x2212;47.47&#x2264;b*&#x2264;&#x2212;45.08.

Toner container, image forming unit, and image forming apparatus

A toner container used in an image forming apparatus including an exposure unit with a light emitting diode light source includes a container body, and a cyan toner stored in the container body. A lightness L*, a hue a*, and a hue b* of the cyan toner in a powder state satisfy26.94&#x2264;*&#x2264;34.84,&#x2212;5.13&#x2264;*&#x2264;3.83, and&#x2212;47.47&#x2264;*&#x2264;&#x2212;36.78.

Provided are a toner, and a developing agent container, an image forming unit and an image forming apparatus including the toner. The toner includes a toner particle. The toner particle includes at least one brilliant pigment particle, binder resin containing the brilliant pigment particle, and a parting agent dispersed in the binder resin, wherein a hydrophobicity degree of the brilliant pigment particle is in a range from 61.2 to 92.7.

Toner, developing agent container, image forming unit, and image forming apparatus

A developer includes a binder resin, a releasing agent; and a brilliant pigment. A peak endothermic amount of the developer measured using a differential scanning calorimetry (DSC) in a second temperature rising process is in a range from 6.20 to 14.40 J/g.

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Tokyo, Japan

Hideharu Kuwabara