公开(公告)号：US20180088475A1

公开(公告)日：2018-03-29

申请号：US15801286

申请日：2017-11-01

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Shinjiro SUZUKI ,  Tomoki HASEGAWA ,  Hirotaka KOBAYASHI

IPC: G03G5/05 ,  G03G5/047 ,  G03G5/06

CPC classification number: G03G5/0564 ,  G03G5/047 ,  G03G5/0525 ,  G03G5/056 ,  G03G5/0612 ,  G03G5/0614 ,  G03G5/0629 ,  G03G5/0668 ,  G03G5/0672 ,  G03G5/0696

Abstract: An electrophotographic photoreceptor causing no image defect even in long-term use and has excellent wear performance, a method of producing the same, and an electrophotographic device are provided. The electrophotographic photoreceptor includes a photosensitive layer on a conductive substrate. The slope k of a straight line obtained by plotting the average film density of outermost layer and the boiling point of solvent used for the formation of the outermost layer along the ordinate and the abscissa, respectively, is 1.50E-4 (g/cm3·° C.) or greater, and the difference in film density of the outermost layer between the surface side and the side close to the conductive substrate is 0.030 g/cm3 or less.

公开(公告)号：US20190163077A1

公开(公告)日：2019-05-30

申请号：US16264184

申请日：2019-01-31

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Masaru TAKEUCHI ,  Hirotaka KOBAYASHI ,  Toshiki OBINATA ,  Fengqiang ZHU

IPC: G03G5/05 ,  G03G15/00 ,  G03G5/06

Abstract: An electrophotographic photoreceptor of a negatively-chargeable laminate-type includes a conductive substrate; a charge generation layer provided on the conductive substrate and including a charge generating material; and a charge transport layer provided on the charge generation layer and containing, as a binder resin, a copolymerized polycarbonate resin having a repeating unit represented by Formula (1); as a hole transporting substance, a compound having a structure represented by Formula (2); as an electron transporting substance, a compound having a structure represented by Formula (3), and, as an antioxidant, a compound represented by Structural Formula (4), where a mass ratio H/(B+H) represents a ratio of mass (H) of the hole transporting substance with respect to a sum of mass (B) of the binder resin and the mass (H) of the hole transporting substance, and satisfies Formula (5), 20% by mass≤H/(B+H)≤35% by mass.

公开(公告)号：US20180275537A1

公开(公告)日：2018-09-27

申请号：US15994597

申请日：2018-05-31

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Tomoki HASEGAWA ,  Shinjiro SUZUKI ,  Fengqiang ZHU ,  Hirotaka KOBAYASHI

IPC: G03G5/05 ,  G03G5/047 ,  G03G5/10 ,  G03G5/06

CPC classification number: G03G5/0507 ,  G03G5/047 ,  G03G5/0525 ,  G03G5/0546 ,  G03G5/0564 ,  G03G5/0614 ,  G03G5/0629 ,  G03G5/0696 ,  G03G5/102 ,  G03G5/142 ,  G03G2215/00957

Abstract: A photoreceptor for electrophotography and an electrophotography device having the same reduces wear loss of the photoreceptor surface and stably obtaining a favorable image for long time. The photoreceptor for electrophotography includes a conductive substrate and a charge transport layer provided on the conductive substrate. The charge transport layer contains a charge transport material, a resin binder, and an inorganic oxide filler surface-treated with a silane coupling agent. A difference (ΔSPa) in a dipole-dipole force component that is a Hansen solubility parameter between the charge transport material and the silane coupling agent satisfies a relationship ΔSPa

公开(公告)号：US20170146916A1

公开(公告)日：2017-05-25

申请号：US15279874

申请日：2016-09-29

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Masaru TAKEUCHI ,  Hirotaka KOBAYASHI ,  Toshiki OBINATA ,  Toshiki TAKEUCHI

IPC: G03G15/00

CPC classification number: G03G5/0631 ,  G03G5/047 ,  G03G5/0609 ,  G03G5/0612 ,  G03G5/0614 ,  G03G5/0618 ,  G03G5/0635 ,  G03G5/0648 ,  G03G5/14704 ,  G03G5/14721

Abstract: In a negatively-chargeable laminate-type electrophotographic photoreceptor, a charge generation layer and another charge transport layer are arranged on a conductive substrate directly or via an intermediate layer. The charge transport layer contains at least a hole-transporting substance, an electron-transporting substance and a binder resin; the mass ratio (RPN) [% by mass] between mass (P) of the hole-transporting substance and mass (N) of the electron-transporting substance is represented by the following equation (1), and satisfies the following equation (2): RPN=(N/(P+N))×100  (1) 1≦RPN≦40  (2); and when a voltage of +6 kV is applied to the photoreceptor for 5 seconds via a resin sheet having a thickness of 50 μm and a surface resistivity of 2×107 Ω/cm2, the surface potential difference (ΔVo) and half-tone potential difference (ΔVh) between before and after the voltage application are both 15 V or less.

公开(公告)号：US20200026206A1

公开(公告)日：2020-01-23

申请号：US16588251

申请日：2019-09-30

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Hirotaka KOBAYASHI ,  Yutaka IKEDA ,  Yuji OGAWA ,  Masaru TAKEUCHI

IPC: G03G5/047 ,  G03G15/18 ,  G03G15/08 ,  G03G5/06 ,  G03G5/147

Abstract: The present invention provides an electrophotographic photoreceptor including a photosensitive layer containing an electron transport material, and having high pressure resistance and suppressed occurrence of a leak phenomenon, a method for producing the same, and an electrophotographic device using the same. The electrophotographic photoreceptor includes an electrically conductive support containing an aluminum alloy; an anodic oxide film formed on a surface of the electrically conductive support; and a photosensitive layer formed on the anodic oxide film. The photosensitive layer contains an electron transport material having an electron mobility of 10−7 cm2/V/sec or more when field intensity is set to 20 V/μm. The surface of the electrically conductive support having the anodic oxide film formed thereon has an admittance value that is 25 μS or more and 60 μS or less.

公开(公告)号：US20190384191A1

公开(公告)日：2019-12-19

申请号：US16549320

申请日：2019-08-23

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Hirotaka KOBAYASHI

IPC: G03G5/10 ,  G03G5/05 ,  G03G5/043 ,  G03G15/08

Abstract: An electrically conductive support for use in an electrophotographic photoreceptor includes a cylindrical main body having a first end and a second end opposite to the first end in an axial direction of the main body. The main body contains an aluminum alloy and has an internal stress in a range of −30 MPa to 5 MPa. A method of producing the electrically conductive support includes preparing a substrate containing an aluminum alloy obtained at least through an extrusion step, and heat treating the substrate to obtain the electrically conductive support. The heat treating is carried out such that, when a temperature of the heat treating is defined as T (° C.) and a time of the heat treating is defined as H (hours), an amount of the heat treating Q defined by Q=T×H is 800 or less.

公开(公告)号：US20180224760A1

公开(公告)日：2018-08-09

申请号：US15943682

申请日：2018-04-02

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Shinjiro SUZUKI ,  Tomoki HASEGAWA ,  Fengqiang ZHU ,  Yuji OGAWA ,  Hirotaka KOBAYASHI

IPC: G03G5/05

Abstract: The invention provides an electrophotographic photoreceptor, which undergoes little abrasion over long term use and is able to develop a stable image, as well as a method of producing the same and an electrophotographic device including the same. The electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer that contains an inorganic oxide and that is formed on the conductive substrate from a coating liquid. A test slurry containing 20% by mass of the inorganic oxide dispersed in a solvent for forming the coating liquid has a light transmittance of 40% or more in a test case where light having a wavelength of 780 nm irradiates the test slurry.