Canon Kabushiki Kaisha

Yuma Kobayashi

Koichi Suzuki

Akeshi Asaka

Taiki Watanabe

Akiko Kitao

Akihiro Taya

Hidetaka Kawamura

Satoru Nishiuma

Ryunosuke Kawahara

An optical system consists of, in order from an object side to an image side, a first unit, a second unit, and a third unit. The first unit includes a first substrate, a first lens disposed on the object side of the first substrate, and a second lens having negative power and disposed on the image side of the first substrate. The second unit includes a second substrate and a third lens having positive power and disposed on the object side or the image side of the second substrate. The third unit includes a third substrate and a fourth lens having positive power and disposed on the object side or the image side of the third substrate. A predetermined condition is satisfied.

Optical system and image pickup apparatus

Provided is an electrophotographic belt having an endless shape including a base layer, wherein the base layer includes a polyimide film containing polyimide serving as a binder resin and a carbon nanotube, wherein the polyimide has an imidization ratio of 80% or more, wherein the carbon nanotube has at least one resin selected from the group consisting of: polyphenylsulfone; polysulfone; and polyethersulfone present on at least part of a surface thereof. The base layer has a tensile strength of 200 MPa or more in each of a peripheral direction thereof and a direction perpendicular to the peripheral direction.

Electrophotographic belt, electrophotographic image forming apparatus, method of producing electrophotographic belt, and varnish

The modified graphene includes a structure represented by the following formula (I), wherein the modified graphene has a ratio (g/d) of an intensity 'g' of a G band to an intensity “d” of a D band of 1.0 or more in a Raman spectroscopy spectrum thereof:Gr1-Ar1-X1-(Y1)  (I)in the formula (I), Gr1 represents a single-layer graphene or a multilayer graphene, Ar1 represents an arylene group having 6 to 18 carbon atoms, X1 represents a single bond, a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms, or a group obtained by substituting at least one carbon atom in a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms with at least one structure selected from the group consisting of —O—, —NH—, —CO—, —COO—, —CONH—, and an arylene group.

Modified graphene, method of producing modified graphene, modified graphene-resin composite, modified graphene sheet, and modified graphene dispersion

An apparatus includes a system having an element capable of changing a radius at which a normalized transmittance becomes 0.25 by 20% or more of a maximum effective radius and a stop capable of changing an aperture radius, and a control unit for controlling a transmittance distribution of the element and the aperture radius.

Optical apparatus

Provided is an electrophotographic belt of an endless shape including a substrate, wherein the substrate contains a polyimide resin and carbon nanotubes, wherein a content of the carbon nanotubes in the substrate is 15 vol % or less with respect to a total volume of the polyimide resin, wherein the substrate has a tensile strength of 200 MPa or more in each of a peripheral direction thereof and a direction perpendicular to the peripheral direction, and wherein the substrate has a thermal conductivity of 0.9 W/(m·K) or more in a thickness direction thereof.

Electrophotographic belt having a substrate containing a polyimide resin and carbon nanotubes, electrophotographic image forming apparatus, fixing device, and varnish

The modified graphene includes a structure represented by the following formula (I), wherein the modified graphene has a ratio (g/d) of an intensity 'g' of a G band to an intensity 'd' of a D band of 1.0 or more in a Raman spectroscopy spectrum thereof:Gr1-Ar1-X1-(Y1)&#x2003;&#x2003;(I)in the formula (I), Gr1 represents a single-layer graphene or a multilayer graphene, Ar1 represents an arylene group having 6 to 18 carbon atoms, X1 represents a single bond, a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms, or a group obtained by substituting at least one carbon atom in a linear, branched, or cyclic alkylene group having 1 to 20 carbon atoms with at least one structure selected from the group consisting of &#x2014;O&#x2014;, &#x2014;NH&#x2014;, &#x2014;CO&#x2014;, &#x2014;COO&#x2014;, &#x2014;CONH&#x2014;, and an arylene group.

Growing community of inventors

Kawasaki, Japan

Yuma Kobayashi