1
Liyuan Han, Takatsugu Obata, Yuko Inoue: Photoelectric material using organic photosensitising dyes and manufacturing method thereof. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, March 28, 2000: US06043428 (35 worldwide citation)

A photoelectric material having high efficiency and superior durability is provided. The photoelectric material includes a semiconductor and a photosensitizing dye attached to the semiconductor, wherein the dye is a phthalocyanine derivative, a dioxazine derivative or an indigo derivative having at ...


2
Akihiro Kondoh, Takatsugu Obata, Kazuya Ishida: Organic photoconductive material electrophotographic photoreceptor and image forming apparatus using the same. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, August 26, 2008: US07416824 (30 worldwide citation)

According to the present invention, an enamine compound having a specific structure is used as an organic photoconductive material. This enamine compound is obtained based on asymmetrical secondary naphtylamine which is readily available at a lowest price, by introducing phenyl groups containing sub ...


3
Masato Miyauchi, Kaori Fujii, Takahiro Teramoto, Yuko Takeda, Takatsugu Obata, Akihiro Kondo: Crystalline oxotitanylphthalocyanine and electrophotographic photoreceptor using the same. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, April 3, 2001: US06210847 (10 worldwide citation)

An object of the invention is to improve the photosensitivity characteristics, characteristics on repeated use and stability of a photoreceptor. A photosensitive layer formed on a conductive support of a photoreceptor contains crystalline oxotitanylphthalocyanine having major peaks in an X-ray diffr ...


4
Satoshi Nishigaki, Takatsugu Obata, Akihiro Kondo: Electrophotographic photoreceptor and coating composition for charge generating layer. Sharp Kabushiki Kaisha, Nixon & Vanderhye, September 18, 2001: US06291120 (7 worldwide citation)

An object of the invention is to obtain an electrophotographic photoreceptor having high sensitivity, high image quality, high stability and high resolution. A charge generating layer of the electrophotographic photoreceptor contains, as a charge generating substance, a crystalline titanyl phthalocy ...


5
Takatsugu Obata, Akihiro Kondoh, Kazuya Ishida: Organic photoconductive material, electrophotographic photoreceptor comprising the same, and image-forming apparatus. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, February 13, 2007: US07175956 (5 worldwide citation)

The invention is to provide an organic photoconductive material capable of realizing electrophotographic photoreceptors of high reliability that have high charge potential, high sensitivity, good responsiveness to light and good durability, of which the characteristics do not lower even when they ar ...


6
Ichiroh Fujii, Takatsugu Obata, Mikio Kakui: Image forming apparatus. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, November 25, 2008: US07457565 (2 worldwide citation)

An image forming apparatus having excellent chargeability, sensitivity and light responsivity of an electrophotographic photoconductor and capable of forming images of high quality and high resolution at a high speed in various circumstances, is provided. An electrophotographic photoconductor having ...


7
Kazuya Ishida, Takatsugu Obata, Junichi Washo: Apparatus and method for applying coating liquid to cylindrical substrate, and electrophotographic photoreceptor produced by that method and electrophotographic apparatus provided with the same. Sharp Kabushiki Kaisha, Edwards Angell Palmer & Dodge, David G Conlin, Peter J Manus, July 22, 2008: US07402209 (2 worldwide citation)

A coating liquid to be used for coating has a loss tangent tan δ of from 1 to 10 at a frequency of 6.28 radians/sec. A coating liquid supplying roll has a fine concave portion in at least a part of the circumferential length thereof, and in the vicinities of the both circumferential ends of the fine ...


8
Takatsugu Obata, Akihiro Kondoh, Kazuya Ishida: Electrophotographic photoreceptor and image forming apparatus having the same. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, May 19, 2009: US07534539 (1 worldwide citation)

An object of the invention is to provide a highly reliable electrophotographic photoreceptor having high sensitivity, excellent in light responsivity, not suffering from lowering of such characteristics even when it is used under a low temperature circumstance or in a high speed electrophotographic ...


9
Kazuya Ishida, Akihiro Kondoh, Takatsugu Obata: Electrophotographic photoreceptor, electrophotographic image forming method, and electrophotographic apparatus. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, June 1, 2010: US07727693 (1 worldwide citation)

An object of the invention is to provide an electrophotographic photoreceptor showing high responsivity even under a low temperature and low humidity circumstance and capable of compatibilize the decrease of the size and the increase in the image forming speed of an electrophotographic apparatus. In ...


10
Akihiro Kondoh, Hiroshi Sugimura, Takatsugu Obata: Asymmetric bis-hydroxyenamine compound, electrophotographic photoreceptor and image forming apparatus. Sharp Kabushiki Kaisha, Nixon & Vanderhye P C, December 1, 2009: US07625681 (1 worldwide citation)

There is provided an organic photoconductive material that can realize an electrophotographic photoreceptor which is not only excellent in charge transporting ability but also excellent in solubility in a solvent and compatibility with a resin and moreover, which is excellent in both electric proper ...