Patents by Inventor Eiji Kurimoto
Eiji Kurimoto 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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Publication number: 20150309430Abstract: An electrophotographic photoconductor including a support, an undercoat layer overlying the support, and a photosensitive layer overlying the undercoat layer is provided. The undercoat layer includes zinc oxide particles and a binder resin. The undercoat layer has a voltage (V)-current (I) characteristics such that, when S1 is a value obtained by integrating current (I[A]) in terms of voltage (V[V]) from 0 to a distribution voltage VUL[V] distributed to the undercoat layer, and S2 is a value obtained by integrating a line connecting two points at a voltage (V[V]) of 0 and the distribution voltage VUL[V] in terms of voltage (V[V]) from 0 to the distribution voltage VUL[V], S1 is within a range of from 1.0×10?4 to 1.0×10?2 and a ratio (S1/S2) of S1 to S2 is 0.50 or less.Type: ApplicationFiled: March 26, 2015Publication date: October 29, 2015Inventors: Daisuke NII, Eiji Kurimoto, Tetsuro Suzuki, Tomoharu Asano, Toshihiro Ishida
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Publication number: 20150168856Abstract: A photoconductor is provided. The photoconductor includes an electroconductive substrate; an intermediate layer located overlying the electroconductive substrate; and a photosensitive layer located overlying the intermediate layer. The intermediate layer includes at least a resin, and a particulate zinc oxide that includes sodium, sulfur and calcium in amounts of from 10 ppm to 200 ppm, from 50 ppm to 500 ppm, and from 10 ppm to 200 ppm, respectively.Type: ApplicationFiled: December 2, 2014Publication date: June 18, 2015Inventors: Eiji KURIMOTO, Tetsuro SUZUKI, Tomoharu ASANO, Daisuke NII, Toshihiro ISHIDA
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Patent number: 8932787Abstract: An electrophotographic photoconductor including: an electroconductive substrate; an intermediate layer; and a photoconductive layer, the intermediate layer and the photoconductive layer being on the electroconductive substrate, wherein the intermediate layer includes an inorganic pigment and a binder resin, wherein a volume ratio of the inorganic pigment in the intermediate layer is 30% by volume to 50% by volume, wherein the inorganic pigment comprises titanium oxide and a content of the titanium oxide in the inorganic pigment is 70% by mass to 90% by mass, wherein the inorganic pigment has a specific surface area of 70 m2/g to 140 m2/g, and wherein the intermediate layer has a volume resistivity at an electrical field intensity of 2.5×105 V/cm of 5×1011 ?·cm to 1×1013 ?·cm.Type: GrantFiled: December 14, 2012Date of Patent: January 13, 2015Assignee: Ricoh Company, Ltd.Inventors: Eiji Kurimoto, Tadayoshi Uchida, Hideki Nakamura
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Patent number: 8727592Abstract: A light source module of the present invention is configured such that there is a through hole (23) in one longitudinal end portion of a light guide (21) that constitutes a light guide plate, into which through hole (23) a positioning pin (24) for positioning an LED light source (12) and the light guide (21) fits. Further, a guide (9) is provided to the other end portion of the light guide (21), which guide (9) restrains the light guide (21) in a direction of a short side but does not restrain the light guide (21) in a direction of a long side. This makes it possible to provide a light source module that can reduce warping and cracking caused by expansion of a light guide, and an electronic apparatus including the light source module.Type: GrantFiled: August 4, 2010Date of Patent: May 20, 2014Assignee: Sharp Kabushiki KaishaInventors: Takuya Ishizaka, Kazuya Ikuta, Eiji Kurimoto, Sumito Nishioka, Keiji Sakai, Hirotsugu Matoba, Takeshi Takayama
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Patent number: 8659709Abstract: An object of the present invention is to obtain a display device having excellent display quality by appropriately modifying the chromaticity of images. In this display device, a correction processing part (CPU 30) determines a first chromaticity change amount stored in memory (31) on the basis of a first cumulative usage amount, which is the cumulative usage amount of an LED (17) up to a present time, the cumulative value having been measured by a counter (32), and the correction processing part also determines a second chromaticity change amount stored in the memory (31) on the basis of a second cumulative usage amount, which is the cumulative usage amount of the LED (17) up to a time when the chromaticity of a pixel is adjusted by a chromaticity adjusting part (CPU 30), the cumulative value having been measured by the counter (32).Type: GrantFiled: November 24, 2011Date of Patent: February 25, 2014Assignee: Sharp Kabushiki KaishaInventors: Tohru Hanaoka, Fumio Kokubo, Eiji Kurimoto, Ryoji Ishimura, Shota Inoue, Fumiaki Yamada
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Patent number: 8599447Abstract: In a light source unit (210) serving as an embodiment of an illuminating apparatus, when P is a light-emitting element pitch [mm], and H is an optical axis distance [mm] between light-emitting elements (212) and an original (G), and when, in an illuminance cycle (T) representing repetition of bright and dark areas in a main scanning direction (X) on a light-irradiated face (Gs) of the original (G) caused by the light-emitting elements (212), the light-emitting element pitch (P) and the optical axis distance (H) are set such that unevenness [%] (M) (=(L1?L2)/L3 [%]) obtained by dividing a value obtained by subtracting a minimum illuminance value (L2) from a maximum illuminance value (L1) by an average illuminance value (L3) and an inter-unevenness distance [mm] (N) which is a half cycle of the illuminance cycle (T) satisfy the relation M?N/2?5.5, and more preferably, M?N/2?7.5.Type: GrantFiled: December 18, 2009Date of Patent: December 3, 2013Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Suto, Tomohiko Okada, Shohichi Fukutome, Hisashi Yamanaka, Kenji Nakanishi, Yoshihisa Yamada, Mitsuharu Yoshimoto, Eiji Kurimoto, Keiji Sakai
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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: 20130250187Abstract: An object of the present invention is to obtain a display device having excellent display quality by appropriately modifying the chromaticity of images. In this display device, a correction processing part (CPU 30) determines a first chromaticity change amount stored in memory (31) on the basis of a first cumulative usage amount, which is the cumulative usage amount of an LED (17) up to a present time, the cumulative value having been measured by a counter (32), and the correction processing part also determines a second chromaticity change amount stored in the memory (31) on the basis of a second cumulative usage amount, which is the cumulative usage amount of the LED (17) up to a time when the chromaticity of a pixel is adjusted by a chromaticity adjusting part (CPU 30), the cumulative value having been measured by the counter (32).Type: ApplicationFiled: November 24, 2011Publication date: September 26, 2013Applicant: SHARP KABUSHIKI KAISHAInventors: Tohru Hanaoka, Fumio Kokubo, Eiji Kurimoto, Ryoji Ishimura, Shota Inoue, Fumiaki Yamada
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Publication number: 20130157181Abstract: An electrophotographic photoconductor including: an electroconductive substrate; an intermediate layer; and a photoconductive layer, the intermediate layer and the photoconductive layer being on the electroconductive substrate, wherein the intermediate layer includes an inorganic pigment and a binder resin, wherein a volume ratio of the inorganic pigment in the intermediate layer is 30% by volume to 50% by volume, wherein the inorganic pigment comprises titanium oxide and a content of the titanium oxide in the inorganic pigment is 70% by mass to 90% by mass, wherein the inorganic pigment has a specific surface area of 70 m2/g to 140 m2/g, and wherein the intermediate layer has a volume resistivity at an electrical field intensity of 2.5×105 V/cm of 5×1011 ?·cm to 1×1013 ?·cm.Type: ApplicationFiled: December 14, 2012Publication date: June 20, 2013Inventors: Eiji Kurimoto, Tadayoshi Uchida, Hideki Nakamura
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Patent number: 8380109Abstract: An image forming apparatus including at least an image bearing member having a substrate having a photosensitive layer thereon, the image bearing member to bear a latent electrostatic image on a surface thereof, a charging device to the surface of the image bearing member, an irradiation device to irradiate the surface of the image bearing member with light to form a latent electrostatic image thereon, a development device to develop the latent electrostatic with toner to obtain a developed image, a transfer device to transfer the developed image to a recording medium, and a cleaning device to clean the surface of the image bearing member, wherein the photosensitive layer includes naphthalene tetracarbonic acid diimide derivative as a charge transport material represented by the following Chemical Structure (1): In the Chemical Structure (1), Z represents a group represented by the following Chemical Formula (1): or the following Chemical Formula (2): —R9??Chemical Formula (2).Type: GrantFiled: January 9, 2009Date of Patent: February 19, 2013Assignee: Ricoh Company, Ltd.Inventors: Eiji Kurimoto, Keisuke Shimoyama, Tomoyuki Shimada, Masafumi Ohta, Yuuji Tanaka
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Patent number: 8349529Abstract: An electrophotographic photoconductor including a conductive substrate and a photoconductive layer thereover, wherein the photoconductive layer contains a charge generation agent and a charge transport agent represented by General Formula (A-I), (B-I) or (C-I), and an amine compound represented by General Formula (II): where R1-3 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, and n is 1 or 2, where R1-2 each represent C1-6 alkyl and R3-6 each represent hydrogen, halogen or (un)substituted C1-6 alkyl, where R8-33 each represent hydrogen, C1-4 alkyl, C1-4 alkoxy, or (un)substituted phenyl, and may be identical or different, where A and B each represent a group represented by formula (i) or (ii), and may be identical or different: —CH2X??formula (i) —CH2CH2Y??formula (ii) where X and Y each represent an (un)substituted aromatic group.Type: GrantFiled: May 12, 2010Date of Patent: January 8, 2013Assignee: Ricoh Company, Ltd.Inventors: Keisuke Shimoyama, Takaaki Ikegami, Eiji Kurimoto, Kohsuke Yamamoto, Tetsuya Sakuma, Toshihiko Koizumi, Hajime Suzuki, Hideki Nakamura
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Publication number: 20120287670Abstract: A light source module of the present invention is configured such that there is a through hole (23) in one longitudinal end portion of a light guide (21) that constitutes a light guide plate, into which through hole (23) a positioning pin (24) for positioning an LED light source (12) and the light guide (21) fits. Further, a guide (9) is provided to the other end portion of the light guide (21), which guide (9) restrains the light guide (21) in a direction of a short side but does not restrain the light guide (21) in a direction of a long side. This makes it possible to provide a light source module that can reduce warping and cracking caused by expansion of a light guide, and an electronic apparatus including the light source module.Type: ApplicationFiled: August 4, 2010Publication date: November 15, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Takuya Ishizaka, Kazuya Ikuta, Eiji Kurimoto, Sumito Nishioka, Keiji Sakai, Hirotsugu Matoba, Takeshi Takayama
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Publication number: 20120275188Abstract: In order to suppress spread of light in a direction (shorter side direction) perpendicular to a direction (longer side direction) in which a light source is directed, the light source module of the present invention includes a light guide plate (20), an LED (12) for emitting light toward at least one edge surface in the longer side direction of the light guide plate (20), and a microlens group (20b) which (i) is provided on a lower surface (20c) opposite to an emission surface (20d) of the light guide plate (20) and (ii) causes light guided in the light guide plate (20) to be extracted through the emission surface (20d). The light source module further includes curved plane structures (20a) which are (i) made up of curved planes whose ridges (20e) extend in the longer side direction and (ii) provided in the emission surface (20d).Type: ApplicationFiled: April 8, 2011Publication date: November 1, 2012Applicant: Sharp Kabushiki KaishaInventors: Eiji Kurimoto, Takuya Ishizaka, Kazuya Ikuta, Sumito Nishioka, Fumio Kokubo, Keiji Sakai
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Patent number: 8278016Abstract: An electrophotographic photoconductor including an electroconductive support and a photoconductive layer provided thereon, wherein the photoconductive layer includes a charge generating material, an electron transporting material and a hole transporting material, the electron transporting material being a diphenoquinone compound represented by formula (1) described herein, the hole transporting material being a compound represented by formula (2) described herein.Type: GrantFiled: June 9, 2009Date of Patent: October 2, 2012Assignee: Ricoh Company, Ltd.Inventors: Keisuke Shimoyama, Eiji Kurimoto, Takaaki Ikegami, Kohsuke Yamamoto, Tadayoshi Uchida, Takumi Shinohara, Hajime Suzuki
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Patent number: 8263297Abstract: An electrophotographic photoconductor including a conductive support and a photosensitive layer, wherein the photosensitive layer contains a charge generation agent, a charge transport agent and a binder resin, and wherein the charge generation agent contains an asymmetric disazo pigment represented by General Formula (I), the charge transport agent contains a triphenylamine compound represented General Formula (IX), and the mass ratio of the charge transport agent to the binder resin is 0.3 to 2.0, where R1 and R2 each represent a substituted or unsubstituted alkyl group, alkoxy group, aryl group or heterocyclic group, provided that R1 and R2 are different, where R3 to R5 each represent hydrogen, a halogen atom, an alkyl group having 1 to 6 carbon atoms, which may have a substituent, an alkoxy group having 1 to 6 carbon atoms, which may have a substituent, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms.Type: GrantFiled: November 25, 2008Date of Patent: September 11, 2012Assignees: Ricoh Company, Ltd., Yamanashi Electronics Co., Ltd.Inventors: Takaaki Ikegami, Takeshi Takada, Toshihiko Koizumi, Hideki Nakamura, Hajime Suzuki, Keisuke Shimoyama, Kohsuke Yamamoto, Eiji Kurimoto
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Patent number: 8252499Abstract: A high-quality, stable image forming apparatus and method which are free from abnormal images, particularly afterimages, after prolonged repeated use by using a photoconductor a conductive substrate and a single-layered photosensitive layer which contains a charge generating material, an electron transporting material, a positive-hole transporting substance and a binder resin, wherein the charge generating material contains crystalline titanyl phthalocyanine having a maximum diffraction peak of at least 27.2° as a diffraction peak ±0.2° of the Bragg angle 2? with respect to the Cu-K? line of the wavelength of 1.542?, further having major peaks at 9.4°, 9.6°, 24.0°, and also having a peak at 7.3° as a diffraction peak on the lowest angle side but not having a peak between the peak of 7.3° and that of 9.Type: GrantFiled: January 26, 2011Date of Patent: August 28, 2012Assignee: Ricoh Company, Ltd.Inventors: Eiji Kurimoto, Keisuke Shimoyama
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Publication number: 20120195071Abstract: A light source module (1) capable of preventing LED light from leaking from a gap between light-guiding members includes: light-guiding members (3) aligned in parallel with each other in a long side direction of the light-guiding members (3) with a gap between adjacent light-guiding members (3), and LEDs (4) each for causing light to be incident to at least one end face (8) of the light-guiding member (3) in the long side direction. A cross section of the light-guiding member (3) taken along a direction perpendicular to the long side direction of the light-guiding member (3) is designed such that a side edge (7) of the cross section is thinner than a central portion (9) of the cross section, and between adjacent light-guiding members (3), there is provided a light-shielding member (2) for preventing light from the LED (4) from leaking into a gap between said adjacent light-guiding members (3).Type: ApplicationFiled: January 28, 2010Publication date: August 2, 2012Applicant: Sharp Kabushiki KaishaInventors: Sumito Nishioka, Eiji Kurimoto, Kazuya Ikuta
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Patent number: 8232031Abstract: The present invention provides a naphthalenetetracarboxylic acid diimide derivative represented by the following general formula (1): wherein R1 and R2, which are identical or different, each represent a substituted or non-substituted alkyl group or a substituted or non-substituted aromatic hydrocarbon group; R3 represents an alkyl group having 1 to 8 carbon atoms or an aromatic hydrocarbon group; R4, R5, R6 and R7, which are identical or different, each represent a hydrogen atom, a substituted or non-substituted alkyl group, or a substituted or non-substituted aromatic hydrocarbon group; and R1 and R2 may be linked to form a substituted or non-substituted heterocyclic group including a nitrogen atom; with compounds where all of R1, R2 and R3 are a methyl group, and compounds where both of R1 and R2 are a methyl group and R3 is a 1-octyl group being excluded.Type: GrantFiled: September 5, 2008Date of Patent: July 31, 2012Assignee: Ricoh Company, Ltd.Inventors: Masafumi Ohta, Tomoyuki Shimada, Yuuji Tanaka, Eiji Kurimoto, Keisuke Shimoyama
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Patent number: 8227156Abstract: To provide an electrophotographic photoconductor that has a layer containing a compound represented by the following general formula (1), and an image forming apparatus using the electrophotographic photoconductor. where R1 and R2 independently represent any one of a hydrogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group, and R3, R4, R5, R6, R7, R8, R9 and R10 independently represent any one of a hydrogen atom, halogen atom, cyano group, nitro group, amino group, hydroxyl group, substituted or unsubstituted alkyl group, substituted or unsubstituted cycloalkyl group and substituted or unsubstituted aralkyl group.Type: GrantFiled: November 5, 2010Date of Patent: July 24, 2012Assignee: Ricoh Company, Ltd.Inventors: Keisuke Shimoyama, Eiji Kurimoto, Tatsuya Niimi, Shinichi Kawamura, Yoshiki Yanagawa
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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