Canon Kabushiki Kaisha

Fumiyuki Hiyama

Kazuhiro Yamauchi

Yuichi Kikuchi

Kaname Watariguchi

Kohei Makisumi

Nobuhiro Nakamura

Shuntaro Watanabe

Hiroyuki Watanabe

Tomohito Ishida

Shuhei Iwasaki

Seiichi Miyazawa

Hirotaka Araki

In an electrophotographic photosensitive member, wrinkles have a convex portion in which a linear shape portion having a length of 50 μm or longer exists, the linear shape portion is parallel to any one of L1 to L150 and L1651 to L1800, and each of L1 to L1800 intersects with the convex portion at a plurality of places, and at least two of the places have different intersection angles; and when height information of the wrinkles is subjected to a frequency analysis, and a two-dimensional power spectrum is obtained, a one-dimensional radial distribution function has at least one local maximum value, and when an angular distribution is calculated from the spectrum at a frequency of the local maximum value, the power values have a particular relationship.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

A process cartridge including: an electrophotographic photosensitive member having a drum shape; a developing unit for developing an electrostatic latent image on the surface of the electrophotographic photosensitive member with toner; and a cleaning blade for removing the toner on the surface of the electrophotographic photosensitive member, the cleaning blade being in contact with the electrophotographic photosensitive member, wherein the electrophotographic photosensitive member comprises wrinkles on the surface of the electrophotographic photosensitive member, and wherein the toner has a fluidity torque E of 320 mJ or more.

Process cartridge

The process cartridge includes an electrophotographic photosensitive member having a first support and a photosensitive layer; and a charging member. In the photosensitive member when an electric current is measured which flows when a voltage is applied to a surface while being varied, a gradient aof a low electric field region and a gradient aof a high electric field region satisfy a/a&#x2265;1.50, in a graph. The charging member includes a second support having an electroconductive outer surface, and a second electroconductive layer including a matrix and a plurality of domains being dispersed in the matrix, at least a portion of the domain is exposed to an outer surface which includes at least the matrix and at least a portion of the domain, and a volume resistivity &#x3c1;of the matrix is 1.00&#xd7;10times or higher of a volume resistivity &#x3c1;of the domain.

Process cartridge and electrophotographic apparatus

There is provided a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including: an electrophotographic photosensitive member and a charging member, in which when average local potential differences of calculated lengths in the electrophotographic photosensitive member is calculated based on a specific method, a maximum value of the average local potential difference is 2 V or more, the charging member includes a support and an electro-conductive layer, the electro-conductive layer has a matrix and domains dispersed in the matrix, a volume resistivity &#x3c1;M of the matrix is at least 1.00&#xd7;10times a volume resistivity &#x3c1;D of the domain, and a specific calculated length S[&#x3bc;m] and a specific value relating a distance between the domains D[&#x3bc;m] satisfy S&#x2265;3&#xd7;D.

Provided is a process cartridge in which lateral running is suppressed while satisfactory potential fluctuation is maintained. The process cartridge includes: an electrophotographic photosensitive member including a support, a lowermost layer, and a photosensitive layer; and a charging member including a support and a conductive layer. In a case where a maximum frequency at which a phase of an impedance reaches 45&#xb0;, when the impedance is measured by applying an AC voltage to the lowermost layer while changing the AC voltage, is represented by f(Hz), and in a case where a maximum frequency at which a phase of an impedance reaches 45&#xb0;, when the impedance is measured by applying an AC voltage to the charging member while changing the AC voltage, is represented by f(Hz), the fand the feach have a value within a certain range.

Growing community of inventors

Shizuoka, Japan

Fumiyuki Hiyama