Fuji Xerox Co., Ltd.

Masanori Murase

Takahiro Suzuki

Seiji Ashiya

Sadao Okano

Koji Bando

Kazuhiro Saito

Masahiko Hodumi

Yasuo Sakaguchi

Makoto Takemoto

Ichiro Takegawa

Koichi Tanaka

Yasushige Nakamura

Ryosaku Igarashi

Taketoshi Hoshizaki

Seiichi Takagi

Yoshiyuki Ono

Takashi Hino

Shigeto Hashiba

Tsutomu Uezono

A developer storage case includes: a storage case that includes a discharge opening formed in the horizontal direction side surface thereof, that is formed in a flat shape having a horizontal direction width larger than the vertical direction height thereof, and that stores a developer therein; a delivery member that has a center of rotation disposed shifted to the discharge opening, that is rotatably supported on one end wall of the storage case, and that delivers the developer stored within the storage case; and a drive transmission member that is supported on the end portion of the delivery member, and that drives and rotates the delivery member.

Developer storage case having a discharge opening of a flat shape

The toner cartridge is provided with: a toner storing container of a rectangular shape having a toner feeding opening in an angular portion of the toner storing container; a stirring conveying member that is disposed so as to rotate in a predetermined rotation direction in the toner storing container and stirs and conveys toner in the toner storing container toward the toner feeding opening; a waste toner storing container that stores reclaimed toner; and a partition member that is held by the toner storing container, partitions between the toner storing container and the waste toner storing containers and has a bearing portion axially supporting a rotating shaft of the stirring conveying member and extending into inside of the waste toner storing container. The toner stored in the toner storing container has an average value of a shape factor (SF1) of about 130 or less.

Toner cartridge

An electrophotographic photoreceptor comprising a photosensitive layer containing granular trigonal selenium which has a mean particle diameter of not more than 5 .mu.m and which has absorption peaks in the X-ray diffraction spectrum using CuK.alpha. characteristic X-rays at Bragg angles (2.degree..theta..+-.0.2.degree.) of 23.5.degree., 29.7.degree., 41.4.degree., and 45.4.degree., is disclosed, which has high photosensitivity and low residual potential, maintains its potential characteristics in a stable manner on repeated use, and exhibits sufficient photosensitivity even when applied to high-speed copying.

Electrophotographic photoreceptor containing granular trigonal selenium

An electrophotographic photoreceptor comprising an electrically conductive substrate having thereon a subbing layer and a photosensitive layer in sequence, wherein the subbing layer is a layer formed by using a hydrolyzable compound, the layer having a residual organic group content of at least 25 mol % based on the total organic group content of the hydrolyzable compound used, or (ii) by coating a solution of the hydrolyzable compound in an organic solvent in which the hydrolyzable compound has been hydrolyzed to a degree of at least 50%. The coating composition exhibits satisfactory film-forming properties to form a subbing layer without causing cracks which thereby provides an electrophotographic photoreceptor with excellent stability on repeated use.

Electrophotographic photoreceptor

A method for determining a termination time of the step of dispersing a coating composition for a photosensitive layer, containing a binder resin, a powdery charge generating material and a solvent, is disclosed, which comprises (i) providing coating (I) on a substrate by coating the coating composition, following by drying, (ii) providing coating (II) on a substrate by dispersing the coating composition using a dispersion medium to fine the powdery charge generating material, followed by drying, (iii) measuring absorbances of coating (I) at two wavelengths within a short wavelength region and a long wavelength region, respectively, of the spectral absorption wavelength of the charge generating material, (iv) measuring absorbances of coating (II) at the two wavelengthes within the short wavelength region and the long wavelength region, respectively, and (v) calculating spectral absorbance ratios of coatings (I) and (II), respectively, from the following equation: ##EQU1## wherein the dispersing of the coating composition is terminated when the ratio of the spectral absorbance ratio of coating (II) to that of coating (I) exceed a predetermined value.

Method for determining termination time of the step of dispersing a

An electrophotographic photoreceptor comprising a conductive substrate having thereon a photosensitive layer as the uppermost layer, in which the photosensitive layer contains two charge transporting materials different in ionization potential, a charge transporting material having a higher ionization potential is present in the amount equimolar to or in an amount less than the equimolar amount to the other charge transporting material having a lower ionization potential. A laminate type electrophotographic photoreceptor comprising a conductive substrate having thereon a charge generating layer and a charge transporting layer, in which the charge generating layer comprises a binder resin and a charge generating material dispersed therein, the charge transporting layer comprises a binder resin and at least two charge transporting materials including a first charge transporting material and a second charge transporting material, the amount of the first charge transporting material is at least 60 wt % based on the total amount of the charge transporting materials, the difference between the highest ionization potential and the lowest ionization potential the charge transporting materials is not more than 0.4 eV, provided that (1) the ionization potentials of all the charge transporting materials are lower than the ionization potential of the charge generating material, or (2) the ionization potential of the first charge transporting material is lower than the ionization potential of the charge generating material, and the ionization potential of the second charge transporting material is higher than the ionization potential of the charge generating material by at least 0.2 eV.

An electrophotographic photoreceptor comprising a conductive substrate having thereon a charge generating layer comprising a binder resin having dispersed therein a charge generating material and a charge transporting layer containing a charge transporting material is disclosed, wherein the ionization potential of the binder resin, I.sub.pb, the ionization potential of the charge generating material, I.sub.pg, and the ionization potential of the charge transporting material, I.sub.pt, satisfy the following relationship:

Electrophotographic photoreceptor with ionization potential relationships

A novel method for preparing an electrophotographic photoreceptor is disclosed, which comprises laminating a charge generating layer and a charge transporting layer in this order on an electrically conductive substrate via an undercoating layer, wherein the coating solution for said undercoating layer contains an alkoxide coupling agent represented by formula (I), an aliphatic alcohol solvent containing at least the same number of carbon atoms as in the alkoxy group in said alkoxide coupling agent, and at least one compound selected from the group consisting of aromatic solvents, ethylene glycols and propylene glycols:

Method for preparing an electrophotographic photoreceptor

A novel electrophotographic photoreceptor is disclosed, comprising an undercoating layer provided on an electrically conductive substrate having thereon a light-sensitive layer, wherein the undercoating layer is obtained by coating a solution of a composition comprising zirconium and silicon or a solution of a mixture of a zirconium acetyl acetonate compound and a silane coupling agent, the silicon content in the composition comprising zirconium and silicon is in the range of 5 to 35 mol % based on the total amount of zirconium and silicon, and the hardened undercoating layer obtained from the zirconium acetyl acetonate compound and silane coupling agent is a layer having a hardening degree of 1.2 or less.

Electrophotographic photoreceptor having a zirconium and

An electrophotographic photoreceptor for use in electrophotography having a photosensitive layer on an electrically conductive substrate. A fluorine-containing lubricating layer is further place upon the photosensitive layer. The fluorine-containing lubricating agent is selected from perfluoroalkyl polyether or its derivatives.

Electrophotographic photoreceptor containing a fluorine lubricating

An electrophotographic photoreceptor for use in positive charging electrophotographic machines is disclosed, comprising an electrically conductive substrate having thereon a charge transporting layer, a charge generating layer, and a low resistance surface protective layer, in that order, wherein a squarylium acid derivative having an asymmetrical structure represented by the formula (I): ##STR1## wherein R.sub.1 and R.sub.2 may be the same or different and represent a --CH.sub.3 group or a ##STR2## group (wherein Y represents a halogen atom), and X.sub.1 and X.sub.2 may be the same or different and represent a hydrogen atom, an --OH group or a halogen atom, is dispersed in said charge generating layer.

Growing community of inventors

Kanagawa, Japan

Masanori Murase