Patents by Inventor Hiroshi Ikuno
Hiroshi Ikuno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9298113Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 ?·cm or less.Type: GrantFiled: January 15, 2014Date of Patent: March 29, 2016Assignee: Ricoh Company, Ltd.Inventors: Toshihiro Ishida, Hiroshi Ikuno, Tetsuya Toshine, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa
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Patent number: 9170558Abstract: An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on the electrically conductive support, and a surface layer containing a binder resin and particles formed on a surface of the photoconductive layer, or contains the electrically conductive support, and the photoconductive layer formed on the electrically conductive support, wherein the cleaning unit contains a cleaning blade, which contains a cured composition containing a curing agent in a region of the cleaning blade, which is to be in contact with the image bearing member, and wherein the curing agent contains a polycyclic aliphatic hydrocarbon group, and a (meth)acryloyloxy group.Type: GrantFiled: August 28, 2014Date of Patent: October 27, 2015Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Ikuno, Tetsuya Toshine, Masanobu Gondoh, Shinji Nohsho, Shohei Gohda, Kaori Toyama
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Patent number: 9143261Abstract: An optical transceiver includes: a first WDM filter which reflects a first optical signal from a first light source and passes a second optical signal from a second light source; a first total reflection mirror which reflects the first optical signal to make it enter the first WDM filter; a second total reflection mirror which reflects the second optical signal; and a second WDM filter which reflects the second optical signal reflected by the second total reflection mirror to make it enter the first WDM filter. The first and second WDM filters are disposed on a light path, the first and second light sources are disposed back and forth along the light path on both sides thereof, the first and second total reflection mirrors are disposed outside the light path, and an incident angle of the first optical signal to the first WDM filter is smaller than 45 degrees.Type: GrantFiled: August 4, 2014Date of Patent: September 22, 2015Assignee: Hitachi Metals, Ltd.Inventors: Ryuta Takahashi, Hiroshi Ikuno
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Patent number: 9122183Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 ?/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000.Type: GrantFiled: March 5, 2013Date of Patent: September 1, 2015Assignee: Ricoh Company, Ltd.Inventors: Tetsuya Toshine, Hiroshi Ikuno, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa, Toshihiro Ishida
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Patent number: 9037067Abstract: An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the edge line of the cleaning blade includes a substrate of the elastic blade; a mixed layer having a thickness not less than 1.0 ?m, formed of the substrate and at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer having a thickness not less than 0.1 ?m, formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.Type: GrantFiled: January 29, 2013Date of Patent: May 19, 2015Assignee: RICOH COMPANY, LTD.Inventors: Hiroshi Ikuno, Yohta Sakon, Masahiro Ohmori, Kazuhiro Egawa, Tetsuya Toshine
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Publication number: 20150071678Abstract: An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on the electrically conductive support, and a surface layer containing a binder resin and particles formed on a surface of the photoconductive layer, or contains the electrically conductive support, and the photoconductive layer formed on the electrically conductive support, wherein the cleaning unit contains a cleaning blade, which contains a cured composition containing a curing agent in a region of the cleaning blade, which is to be in contact with the image bearing member, and wherein the curing agent contains a polycyclic aliphatic hydrocarbon group, and a (meth)acryloyloxy group.Type: ApplicationFiled: August 28, 2014Publication date: March 12, 2015Inventors: Hiroshi IKUNO, Tetsuya Toshine, Masanobu Gondoh, Shinji Nohsho, Shohei Gohda, Kaori Toyama
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Publication number: 20150037038Abstract: An optical transceiver includes: a first WDM filter which reflects a first optical signal from a first light source and passes a second optical signal from a second light source; a first total reflection mirror which reflects the first optical signal to make it enter the first WDM filter; a second total reflection mirror which reflects the second optical signal; and a second WDM filter which reflects the second optical signal reflected by the second total reflection mirror to make it enter the first WDM filter. The first and second WDM filters are disposed on a light path, the first and second light sources are disposed back and forth along the light path on both sides thereof, the first and second total reflection mirrors are disposed outside the light path, and an incident angle of the first optical signal to the first WDM filter is smaller than 45 degrees.Type: ApplicationFiled: August 4, 2014Publication date: February 5, 2015Inventors: Ryuta TAKAHASHI, Hiroshi IKUNO
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Patent number: 8939656Abstract: An optical module includes a housing, an optical adapter attached to an end portion of the housing, and an optical transmitter assembly mounted in the housing. The optical transmitter assembly includes a TOSA including a plurality of light-emitting elements for outputting optical signals, and a circuit board electrically connected to the TOSA. The TOSA further includes a TOSA base having opposing side surfaces on which the plurality of light-emitting elements are oppositely arranged so as to form at least one pair. The TOSA base includes a light outputting surface having an optical component mounting portion formed thereon, and the optical component mounting portion mounts an optical multiplexer including a plurality of filters.Type: GrantFiled: November 9, 2012Date of Patent: January 27, 2015Assignee: Hitachi Metals, Ltd.Inventors: Ryuta Takahashi, Hiroshi Ikuno
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Publication number: 20140199620Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 ?·cm or less.Type: ApplicationFiled: January 15, 2014Publication date: July 17, 2014Inventors: Toshihiro ISHIDA, Hiroshi IKUNO, Tetsuya TOSHINE, Naohiro TODA, Takafumi IWAMOTO, Kazuhiro EGAWA
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Patent number: 8669030Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer which is located overlying the electroconductive substrate and which is not radically crosslinked; and an outermost layer which is located overlying the photosensitive layer and which includes a radically crosslinked material, wherein the radically crosslinked material includes a unit having a specific formula. An image forming method, an image forming apparatus, and a process cartridge, which use the photoreceptor.Type: GrantFiled: December 11, 2007Date of Patent: March 11, 2014Assignee: Ricoh Company, LimitedInventors: Yukio Fujiwara, Tetsuro Suzuki, Kazukiyo Nagai, Hiroshi Tamura, Hiroshi Ikuno, Hidetoshi Kami
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Publication number: 20140064810Abstract: An image forming apparatus includes an electrophotographic photoreceptor; and a cleaning blade. The electrophotographic photoreceptor includes an outermost layer having a ten-point average roughness Rz of from 0.5 to 2.4 ?m and an average interval between concavities and convexities Sm of from 30 to 300 ?m, and the cleaning blade includes a reed-shaped elastic blade having a contact point to the electrophotographic photoreceptor. The contact point includes a substrate; a mixed layer overlying the substrate, including a material forming the substrate and at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 1.0 ?m; and a surface layer overlying the mixed layer, including at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 0.1 ?m.Type: ApplicationFiled: July 30, 2013Publication date: March 6, 2014Inventors: Takafumi Iwamoto, Hiroshi Ikuno, Tetsuya Toshine, Kazuhiro Egawa, Toshihiro Ishida, Yohta Sakon, Masahiro Ohmori, Naohiro Toda
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Patent number: 8652717Abstract: An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound consisting essentially of a nitrogen atom and a phenyl group, biphenyl group, and condensed polycyclic hydrocarbon group, or a second compound consisting essentially of a nitrogen atom and hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, or aryl groups, substituted or non-substituted alkyl groups, substituted or non-substituted alkoxy groups, substituted or non-substituted aralkyl groups, substituted or non-substituted aryl group, substituted or non-substituted alkylene groups, cyano groups, nitro groups, or —OCO?CH2R16, in which R16 represents a hydrogen atom, a substituted or non-substituted alkyl group, a substituted or non-substituted alkoxy group, or a substituted or non-substituted aryl group.Type: GrantFiled: December 19, 2011Date of Patent: February 18, 2014Assignee: Ricoh Company, Ltd.Inventors: Keisuke Shimoyama, Hiroshi Ikuno, Tetsuya Toshine, Tomoharu Asano, Yasuhito Kuboshima, Yuuji Tanaka
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Patent number: 8647798Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer on the electroconductive substrate; and a protection layer on the photosensitive layer, wherein the protection layer includes a radical polymerizable compound having three or more radical polymerizable groups without a charge transportable group, a monofunctional radical polymerizable compound having a specific charge transportable group and a non-radical polymerizable compound having a specific charge transportable group.Type: GrantFiled: July 24, 2012Date of Patent: February 11, 2014Assignee: Ricoh Company, Ltd.Inventors: Tomoharu Asano, Hiroshi Ikuno, Akihiro Sugino, Hideo Nakamori, Mitsuaki Hirose
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Patent number: 8588630Abstract: An image forming apparatus having a rotary image bearing member, a charging device to charge the image bearing member. an irradiator to irradiate the image bearing member to form a latent electrostatic image thereon, a developing device to develop the latent electrostatic image with a developing agent containing toner to obtain a visible image, a transfer device to transfer the visible image to a recording medium, a first cleaner that slidably contacts the image bearing member to remove toner remaining thereon, a driving mechanism to drive the image bearing member at different linear speeds, a noise detector provided in the vicinity of the image bearing member to detect noise, and an abnormal noise predictor device to predict whether abnormal noise hear during image formation based on noise detected by the noise detector when the image bearing member is driven not during image formation at a linear speed different from that during image formation.Type: GrantFiled: January 5, 2012Date of Patent: November 19, 2013Assignee: Ricoh Company, Ltd.Inventors: Eiji Kurimoto, Hiroshi Ikuno, Keisuke Shimoyama
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Publication number: 20130244150Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 ?/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000.Type: ApplicationFiled: March 5, 2013Publication date: September 19, 2013Inventors: Tetsuya Toshine, Hiroshi Ikuno, Naohiro Toda, Takafumi Iwamoto, Kazuhiro Egawa, Toshihiro Ishida
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Publication number: 20130243506Abstract: An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the edge line of the cleaning blade includes a substrate of the elastic blade; a mixed layer having a thickness not less than 1.0 ?m, formed of the substrate and at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer having a thickness not less than 0.1 ?m, formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate.Type: ApplicationFiled: January 29, 2013Publication date: September 19, 2013Applicant: RICOH COMPANY, LTD.Inventors: Hiroshi Ikuno, Yohta Sakon, Masahiro Ohmori, Kazuhiro Egawa, Tetsuya Toshine
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Patent number: 8535863Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and a crosslinked outermost layer located overlying the photosensitive layer and including a crosslinked material and a specific carbazole compound serving as a charge transport material. An image forming apparatus including the photoreceptor; a charger to charge the photoreceptor; an irradiator to irradiate the charged photoreceptor to form an electrostatic latent image thereon; a developing device to develop the electrostatic latent image with a developer including a toner to form a toner image on the photoreceptor; and a transferring device to transfer the toner image onto a recording material.Type: GrantFiled: August 11, 2011Date of Patent: September 17, 2013Assignee: Ricoh Company, Ltd.Inventors: Tomoharu Asano, Hiroshi Ikuno, Yasuhito Kuboshima, Yuuji Tanaka
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Patent number: 8440713Abstract: A [1]benzothieno[3,2-b][1]benzothiophene compound expressed by General Formula (I): General Formula (I) where X and Y are each independently a hydrogen atom; a halogen atom; or a functional group having a straight or branched aliphatic alkyl group optionally having a halogen atom, a functional group having an alicyclic alkyl group optionally having a halogen atom, a functional group having a straight or branched aliphatic alkenyl group optionally having a halogen atom, a functional group having an alicyclic alkenyl group optionally having a halogen atom, a functional group having a carboxyl group, or a functional group having a thiol group, as a partial structure; and X and Y are the same or each independently different, provided that at least one of X and Y has a straight or branched aliphatic alkenyl group, an alicyclic alkenyl group, a carboxyl group or a thiol group, as a partial structure.Type: GrantFiled: April 15, 2009Date of Patent: May 14, 2013Assignee: Ricoh Company, Ltd.Inventors: Daisuke Goto, Masafumi Torii, Tamotsu Horiuchi, Tamotsu Aruga, Hiroshi Ikuno, Toshiya Sagisaka, Satoshi Yamamoto, Takeshi Orito, Masataka Mohri, Takashi Okada, Takuji Kato, Shinji Matsumoto
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Publication number: 20130059242Abstract: A photoreceptor including an electroconductive substrate; a photosensitive layer on the electroconductive substrate; and a protection layer on the photosensitive layer, wherein the protection layer includes a radical polymerizable compound having three or more radical polymerizable groups without a charge transportable group, a monofunctional radical polymerizable compound having a specific charge transportable group and a non-radical polymerizable compound having a specific charge transportable group.Type: ApplicationFiled: July 24, 2012Publication date: March 7, 2013Inventors: Tomoharu Asano, Hiroshi Ikuno, Akihiro Sugino, Hideo Nakamori, Mitsuaki Hirose
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Publication number: 20120183313Abstract: An image forming apparatus having a rotary image bearing member, a charging device to charge the image bearing member, an irradiator to irradiate the image bearing member to form a latent electrostatic image thereon, a developing device to develop the latent electrostatic image with a developing agent containing toner to obtain a visible image, a transfer device to transfer the visible image to a recording medium, a first cleaner that slidably contacts the image bearing member to remove toner remaining thereon, a driving mechanism to drive the image bearing member at different linear speeds, a noise detector provided in the vicinity of the image bearing member to detect noise, and an abnormal noise predictor device to predict whether abnormal noise hear during image formation based on noise detected by the noise detector when the image bearing member is driven not during image formation at a linear speed different from that during image formation.Type: ApplicationFiled: January 5, 2012Publication date: July 19, 2012Applicant: RICOH COMPANY, LTD.Inventors: Eiji Kurimoto, Hiroshi Ikuno, Keisuke Shimoyama