Patents by Inventor Keisuke Hayashi

Keisuke Hayashi 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).

  • Patent number: 8872750
    Abstract: There is provided a driving circuit which is simple and has a small occupied area. A shift register circuit of the present invention includes a plurality of register circuits. Each of the register circuits includes a clocked inverter circuit and an inverter circuit. Both are connected in series with each other so that an output signal of the clocked inverter circuit becomes an input signal of the inverter circuit. Further, the register circuit includes a signal line by which an output signal of the inverter circuit is transmitted. Since a number of elements are connected to the signal line and parasitic capacitance is large, it has a high load. The shift register circuit of the present invention uses the fact that since the parasitic capacitance of the signal line is large, it has a high load.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: October 28, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yukio Tanaka, Keisuke Hayashi
  • Publication number: 20140267497
    Abstract: A liquid ejection head includes channel forming members and a surface treatment film. The channel forming members are joined to each other via an adhesive agent to form a channel for liquid. The surface treatment film is formed on a surface of at least one of the channel forming members. The surface treatment film is an oxidized film including Si. The oxidized film further includes a transition metal forming a passive film.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 18, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: DAISUKE TAKAGI, HISASHI HABASHI, TOMOYUKI ARATANI, TATSUYA SAMESHIMA, SHINICHI KAKUDA, KEISUKE HAYASHI, JUICHI FURUKAWA
  • Patent number: 8801153
    Abstract: In a liquid drop ejecting head including a diaphragm, a channel member, and a nozzle plate which are laminated in this order, interface surfaces of the channel member and the diaphragm are bonded by an adhesive. The diaphragm is formed to have a laminated structure in which the number of lamination layers is varied at different locations. The diaphragm includes an opening and a filter part, the filter part having plural filtering holes formed in the opening for supplying a liquid to pressurizing liquid chambers of the channel member. A side wall of the channel member disposed to contact or located in a vicinity of the filter part, and a thick-walled portion containing the largest number of lamination layers in the diaphragm do not overlap with each other in a laminating direction.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 12, 2014
    Assignee: Ricoh Company, Ltd.
    Inventor: Keisuke Hayashi
  • Patent number: 8628172
    Abstract: Disclosed is a liquid ejecting head, including two nozzle sequences, each nozzle sequence including nozzles for ejecting a liquid drop, separate liquid chambers communicating with the nozzles, and two common liquid chambers for supplying a liquid to the separate liquid chambers and correspond to the two nozzle sequences, each common liquid chamber including a supply port for supplying a liquid thereto, an aperture, a cross-section thereof in a second direction orthogonal to a first direction of arrangement of the plural nozzles decreasing toward an end portion thereof in the first direction, wherein the supply port and aperture of one of the two common liquid chambers are provided at one end portion and the other end portion in the first direction, respectively, and the supply port and aperture of another one are provided at the other end portion and the one end portion in the first direction, respectively.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: January 14, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Kinokuni, Masataka Yoshiike, Keisuke Hayashi
  • Publication number: 20130307911
    Abstract: A liquid discharge head includes nozzles that discharge liquid droplets, individual channels in communication with the nozzles, a liquid introducing part in communication with the individual channels, a common liquid chamber that supplies liquid to the individual channels, and a filter part arranged between the common liquid chamber and the liquid introducing part. The filter part has filter holes for filtering the liquid over a range of the individual channels in a nozzle array direction. The filter part has at least one reinforcement rib arranged in the nozzle array direction. The reinforcement rib is partially arranged over the range of the individual channels in a direction perpendicular to the nozzle array direction. Filter regions divided by the reinforcement rib are arranged to be in communication via a communication region where the reinforcement rib is not arranged, and the filter holes are arranged at the communication region.
    Type: Application
    Filed: April 23, 2013
    Publication date: November 21, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventor: Keisuke Hayashi
  • Publication number: 20130242004
    Abstract: In a liquid drop ejecting head including a diaphragm, a channel member, and a nozzle plate which are laminated in this order, interface surfaces of the channel member and the diaphragm are bonded by an adhesive. The diaphragm is formed to have a laminated structure in which the number of lamination layers is varied at different locations. The diaphragm includes an opening and a filter part, the filter part having plural filtering holes formed in the opening for supplying a liquid to pressurizing liquid chambers of the channel member. A side wall of the channel member disposed to contact or located in a vicinity of the filter part, and a thick-walled portion containing the largest number of lamination layers in the diaphragm do not overlap with each other in a laminating direction.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 19, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventor: Keisuke Hayashi
  • Publication number: 20130241990
    Abstract: A liquid-jet head includes a thin film member having a thin part and a thick part, and at least a part of the thin film member is formed of an electroformed film. In the liquid-jet head, the thin film member includes a metallic film forming the thin part, a first electroformed film formed on the metallic film, the first electroformed film forming the thick part, and a second electroformed film covering a connecting part between the metallic film and the first electroformed film.
    Type: Application
    Filed: February 28, 2013
    Publication date: September 19, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tatsuya Shimoda, Kenichiro Hashimoto, Keisuke Hayashi
  • Publication number: 20130242012
    Abstract: A liquid-jet head includes nozzles ejecting liquid drops, individual liquid chambers in communication with the corresponding nozzles, a common liquid chamber supplying the liquid to the individual liquid chambers, and a filter member filtering the liquid inside the common liquid chamber. The filter member includes a thin layer having pores and a thick layer on a circumferential part of the thin layer, the thick layer being bonded to the first common liquid chamber member; the thin layer includes a first surface having the thick layer and a second surface opposite to the first surface, a circumferential part of the second surface being bonded to the second common liquid chamber member with an adhesive; and part of or all the pores in the circumferential part of the second surface are exposed in a direction toward the thick layer, and the adhesive overflows into the pores.
    Type: Application
    Filed: February 27, 2013
    Publication date: September 19, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Keisuke Hayashi, Tomohiko Koda
  • Publication number: 20130182040
    Abstract: Disclosed is a liquid ejecting head, including two nozzle sequences, each nozzle sequence including nozzles for ejecting a liquid drop, separate liquid chambers communicating with the nozzles, and two common liquid chambers for supplying a liquid to the separate liquid chambers and correspond to the two nozzle sequences, each common liquid chamber including a supply port for supplying a liquid thereto, an aperture, a cross-section thereof in a second direction orthogonal to a first direction of arrangement of the plural nozzles decreasing toward an end portion thereof in the first direction, wherein the supply port and aperture of one of the two common liquid chambers are provided at one end portion and the other end portion in the first direction, respectively, and the supply port and aperture of another one are provided at the other end portion and the one end portion in the first direction, respectively.
    Type: Application
    Filed: January 11, 2013
    Publication date: July 18, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takashi Kinokuni, Masataka Yoshiike, Keisuke Hayashi
  • Publication number: 20130155159
    Abstract: A liquid droplet ejection head includes plural nozzles; plural individual liquid chambers; a common liquid chamber supplying liquid to the plural individual liquid chambers; a filter sheet member including plural pores formed therein to filter the liquid; and a frame body including an opening part and being in connection with the filter sheet member with adhesive. Further, a size of a region where the plural pores are formed is greater than the opening part of the frame body; an adhesive accumulation area is formed on an inner peripheral end of the opening part; and a size of the adhesive accumulation area in a protruding direction of the adhesive is greater than a size of an area between adjacent pores in the filter sheet member.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 20, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takashi Kinokuni, Keisuke Hayashi, Tatsuya Shimoda
  • Patent number: 8425013
    Abstract: A piezoelectric actuator includes a piezoelectric member having piezoelectric pillars and grooves alternately arrayed. Each of the grooves has a first width at a bottom side of the piezoelectric pillars and a second width at an upper side of the piezoelectric pillars in a direction in which the piezoelectric pillars are arrayed. The first width is greater than the second width.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: April 23, 2013
    Assignee: Ricoh Company, Ltd.
    Inventor: Keisuke Hayashi
  • Publication number: 20120182356
    Abstract: A liquid discharge head includes a piezoelectric actuator. The piezoelectric actuator includes a piezoelectric member on which plural piezoelectric poles are formed, and the plural piezoelectric poles are formed to be inclined in a direction in which the plural piezoelectric poles are arranged.
    Type: Application
    Filed: January 9, 2012
    Publication date: July 19, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Keisuke HAYASHI, Takeshi Sano
  • Publication number: 20110298872
    Abstract: A piezoelectric actuator includes a piezoelectric member having piezoelectric pillars and grooves alternately arrayed. Each of the grooves has a first width at a bottom side of the piezoelectric pillars and a second width at an upper side of the piezoelectric pillars in a direction in which the piezoelectric pillars are arrayed. The first width is greater than the second width.
    Type: Application
    Filed: June 2, 2011
    Publication date: December 8, 2011
    Applicant: RICOH COMPANY, LTD.
    Inventor: Keisuke HAYASHI
  • Patent number: 8042918
    Abstract: A liquid discharging head includes a piezoelectric actuator configured to displace a vibration plate to cause a nozzle to discharge a liquid drop from a liquid chamber. The piezoelectric actuator includes at least three piezoelectric elements aligned in a line. Each of the at least three piezoelectric elements includes a plurality of piezoelectric element columns and a groove. The plurality of piezoelectric element columns is aligned in a direction in which the at least three piezoelectric elements are aligned. The groove is provided between adjacent piezoelectric element columns. At least one of the at least three piezoelectric elements has a pitch between adjacent piezoelectric element columns that is different from a pitch between adjacent piezoelectric element columns of at least one other piezoelectric element of the at least three piezoelectric elements.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: October 25, 2011
    Assignee: Ricoh Company, Ltd.
    Inventor: Keisuke Hayashi
  • Patent number: 7989873
    Abstract: Memory elements, switching elements, and peripheral circuits to constitute a nonvolatile memory are integrally formed on a substrate by using TFTs. Since semiconductor active layers of memory element TFTs are thinner than those of other TFTs, impact ionization easily occurs in channel regions of the memory element TFTs. This enables low-voltage write/erase operations to be performed on the memory elements, and hence the memory elements are less prone to deteriorate. Therefore, a nonvolatile memory capable of miniaturization can be provided.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: August 2, 2011
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Jun Koyama, Keisuke Hayashi
  • Patent number: 7871153
    Abstract: A disclosed liquid jet head includes a nozzle plate having plural nozzles for jetting liquid therefrom, plural flowpaths formed in communication with the plural nozzles, a vibration plate member having a flexible part that forms at least one of the walls of each flowpath, and plural piezoelectric element units having a piezoelectric element member fixed to a base member. Each piezoelectric element unit has plural piezoelectric elements divided by a plurality of slits formed in the piezoelectric element member. The plural piezoelectric element units are arranged in a straight line at predetermined intervals along the plural nozzles.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: January 18, 2011
    Assignee: Ricoh Company, Ltd.
    Inventor: Keisuke Hayashi
  • Patent number: 7697052
    Abstract: A view finder according to the present invention has an electroluminescence display element which displays an image of an object, and an optical element which magnifies the image.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: April 13, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Yu Yamazaki, Keisuke Hayashi
  • Patent number: 7651205
    Abstract: A liquid discharging head includes a piezoelectric actuator including a plurality of piezoelectric elements and a plurality of electric supply members. The plurality of piezoelectric elements is provided in a row and includes an even number of piezoelectric element columns provided via a groove at a predetermined pitch. The plurality of electric supply members supplies electricity to the plurality of piezoelectric elements and includes electrodes disposed for the alternate piezoelectric element columns of the respective piezoelectric elements. One end of the electric supply member is positioned outwardly from an outer end of an endmost driven piezoelectric element column to which the electrode is connected, while another end of the electric supply member is positioned inwardly from an outer end of an endmost non-driven piezoelectric element column to which the electrode is not connected, in a manner that adjacent electric supply members do not overlap.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: January 26, 2010
    Assignee: Ricoh Company, Ltd.
    Inventor: Keisuke Hayashi
  • Publication number: 20090295704
    Abstract: There is provided a driving circuit which is simple and has a small occupied area. A shift register circuit of the present invention includes a plurality of register circuits. Each of the register circuits includes a clocked inverter circuit and an inverter circuit. Both are connected in series with each other so that an output signal of the clocked inverter circuit becomes an input signal of the inverter circuit. Further, the register circuit includes a signal line by which an output signal of the inverter circuit is transmitted. Since a number of elements are connected to the signal line and parasitic capacitance is large, it has a high load. The shift register circuit of the present invention uses the fact that since the parasitic capacitance of the signal line is large, it has a high load.
    Type: Application
    Filed: April 28, 2009
    Publication date: December 3, 2009
    Inventors: Yukio Tanaka, Keisuke Hayashi
  • Patent number: 7528816
    Abstract: There is provided a driving circuit which is simple and has a small occupied area. A shift register circuit of the present invention includes a plurality of register circuits. Each of the register circuits includes a clocked inverter circuit and an inverter circuit. Both are connected in series with each other so that an output signal of the clocked inverter circuit becomes an input signal of the inverter circuit. Further, the register circuit includes a signal line by which an output signal of the inverter circuit is transmitted. Since a number of elements are connected to the signal line and parasitic capacitance is large, it has a high load. The shift register circuit of the present invention uses the fact that since the parasitic capacitance of the signal line is large, it has a high load.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: May 5, 2009
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Yukio Tanaka, Keisuke Hayashi