Patents by Inventor Akio Chiba

Akio Chiba 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: 9360205
    Abstract: A lighting apparatus for a vacuum apparatus that allows light to enter the inside of the vacuum apparatus through an observation window and makes it possible to see the inside of the vacuum apparatus through the observation window by illuminating the inside of the vacuum apparatus includes a coupling adapter that is removably coupled to the observation window via a coupling unit, an opening that is formed in a central part of the coupling adapter and allows the inside of the vacuum apparatus to be seen through the observation window, and a plurality of LEDs (light-emitting diodes) that are placed in the coupling adapter and face the observation window. The lighting apparatus is attached to the observation window for seeing the inside of the vacuum apparatus and illuminates the inside of the vacuum apparatus.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: June 7, 2016
    Assignee: AVC Co., Ltd.
    Inventors: Tomoaki Sasaki, Akio Chiba
  • Publication number: 20130222572
    Abstract: A lighting apparatus for a vacuum apparatus that allows light to enter the inside of the vacuum apparatus through an observation window and makes it possible to see the inside of the vacuum apparatus through the observation window by illuminating the inside of the vacuum apparatus includes a coupling adapter that is removably coupled to the observation window via a coupling unit, an opening that is formed in a central part of the coupling adapter and allows the inside of the vacuum apparatus to be seen through the observation window, and a plurality of LEDs (light-emitting diodes) that are placed in the coupling adapter and face the observation window. The lighting apparatus is attached to the observation window for seeing the inside of the vacuum apparatus and illuminates the inside of the vacuum apparatus.
    Type: Application
    Filed: February 21, 2011
    Publication date: August 29, 2013
    Applicant: AVC Co., Ltd.
    Inventors: Tomoaki Sasaki, Akio Chiba
  • Patent number: 7863802
    Abstract: A crystal element has a crystal blank which is cut from a crystal of quartz and has a principal plane orthogonal to a Y?-axis, where the Y- and Z-axes are rotated by an angle of ? around the X-axis in the crystal to be designated as the Y?- and Z?-axes, and the X- and Y?-axes are rotated by an angle of ? around the Z?-axis to be designated as the X?- and Y?-axes. The crystal blank has mutually orthogonal two null stress-sensitivity axes. In the crystal blank, the thickness of the center part at which two null stress-sensitivity axes intersect is increased, and a ridge line portion defining a quadrangular pyramid like shape from the center part toward the outer peripheral part is formed. The sectional thickness of the crystal blank along the base thereof is larger in the central region and becomes gradually smaller toward both ends.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: January 4, 2011
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Akio Chiba, Shigeru Obara
  • Publication number: 20090102326
    Abstract: A crystal element has a crystal blank which is cut from a crystal of quartz and has a principal plane orthogonal to a Y?-axis, where the Y- and Z-axes are rotated by an angle of ? around the X-axis in the crystal to be designated as the Y?- and Z?-axes, and the X- and Y?-axes are rotated by an angle of ? around the Z?-axis to be designated as the X?- and Y?-axes. The crystal blank has mutually orthogonal two null stress-sensitivity axes. In the crystal blank, the thickness of the center part at which two null stress-sensitivity axes intersect is increased, and a ridge line portion defining a quadrangular pyramid like shape from the center part toward the outer peripheral part is formed. The sectional thickness of the crystal blank along the base thereof is larger in the central region and becomes gradually smaller toward both ends.
    Type: Application
    Filed: October 20, 2008
    Publication date: April 23, 2009
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Akio Chiba, Shigeru Obara
  • Patent number: 7174620
    Abstract: A method of manufacturing a thin quartz crystal wafer from a quartz crystal block which is cut from a crystal body of synthetic quartz crystal and has a flat principal surface, comprises the steps of (a) converging a laser beam at a region in said quartz crystal block at a predetermined depth from the principal surface thereof to cause multiphoton phenomenon state, thereby breaking Si—O—Si bonds of quartz crystal in said region to form voids in said region, and (b) peeling said thin quartz crystal wafer from a body of said quartz crystal block along said voids. The above process is repeatedly performed on one quartz crystal block to peel off a plurality of thin quartz crystal wafers successively from the principal surface of the quartz crystal block. Each of the thin quartz crystal wafers is divided into individual quartz crystal blanks for making quartz crystal units.
    Type: Grant
    Filed: December 26, 2003
    Date of Patent: February 13, 2007
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Akio Chiba, Kozo Ono, Tamotsu Kurosawa
  • Patent number: 7034441
    Abstract: A surface mount crystal unit comprising a crystal blank, a planar mounting substrate made of silicon and a cover having a shape with a recess and made of glass containing ions having high mobility. The mounting substrate and the cover are bonded by means of anode bonding and the crystal blank is hermetically sealed in a case made up of the mounting substrate and the cover. The mounting substrate has connection electrodes used for a connection with the crystal blank and external terminals to be used to surface-mount the crystal unit. The connection electrodes and external terminals are electrically connected.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: April 25, 2006
    Assignee: Nihon Dempa Kogyo Co., Ltd
    Inventors: Kozo Ono, Akio Chiba
  • Patent number: 6953761
    Abstract: An aluminum nitride sintered body produced by sintering under pressure of a powder composition comprising aluminum nitride and 5 to 30% by weight of at least one sintering aid selected from the group consisting of Nd, Sm, Eu, Er, Dy, Gd, Pr and Yb, per 100% by weight of the powders of aluminum nitride and the sintering aid, wherein the amount of the sintering aid is a conversion value as oxides of the elements, the sintering body that has been subjected to mirror-polishing having a surface roughness R max of 0.2 ?m or less and a thermal conductivity of 200 (W/mK) or more.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: October 11, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Tanaka, Akio Chiba, Yasutaka Suzuki, Kazuhiro Hirose, Tamihito Kawahigashi
  • Patent number: 6930440
    Abstract: A tuning fork type quartz crystal unit has a base and a pair of arms extending from respective ends of the base in a crystallographic Y direction of quartz crystal. Each of the arms comprises a first crystal member and a second crystal member which extend in the Y direction. The first crystal member and the second crystal member are joined to each other in a crystallographic YZ plane by a direct bonding such that the first crystal member and the second crystal member have respective crystallographic X directions oriented away from each other and extending parallel to each other. Each of the arms has excitation electrodes disposed respectively on a pair of exposed surfaces thereof which lie in the YZ plane. The direct bonding comprises, for example, a siloxane bond by which the first crystal member and the second crystal member are joined to each other.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: August 16, 2005
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Akio Chiba, Minoru Ishihara, Tamotsu Kurosawa
  • Publication number: 20050139016
    Abstract: Excitation electrodes are respectively affixed to central portions of both surfaces of a long plate-shaped AT-cut crystal resonator, the central portion starts a thickness shear oscillation in the length direction of the crystal resonator when an electric signal is applied to the central portion of the crystal resonator through the excitation electrodes. And, channel-shaped, half-circular-shaped, or trapezoid grooves in cross-section are respectively formed in the plate width direction on middle portions between the center portion and end portions of the crystal resonator. These grooves are formed so as to be symmetrical with respect to a thicknesswise central position of the crystal resonator through a well-known etching technique such as photo-etching and the like.
    Type: Application
    Filed: February 22, 2005
    Publication date: June 30, 2005
    Inventors: Masami Yamanaka, Motoyuki Adachi, Akio Chiba, Kozo Ono
  • Patent number: 6880407
    Abstract: Excitation electrodes are respectively affixed to central portions of both surfaces of a long plate-shaped AT-cut crystal resonator, the central portion starts a thickness shear oscillation in the length direction of the crystal resonator when an electric signal is applied to the central portion of the crystal resonator through the excitation electrodes. And, channel-shaped, half-circular-shaped, or trapezoid grooves in cross-section are respectively formed in the plate width direction on middle portions between the center portion and end portions of the crystal resonator. These grooves are formed so as to be symmetrical with respect to a thicknesswise central position of the crystal resonator through a well-known etching technique such as photo-etching and the like.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: April 19, 2005
    Assignees: Yamata Scale Co., Ltd., Nihon Dempa Kogyo Co., Ltd.
    Inventors: Masami Yamanaka, Motoyuki Adachi, Akio Chiba, Kozo Ono
  • Publication number: 20040135467
    Abstract: A method of manufacturing a thin quartz crystal wafer from a quartz crystal block which is cut from a crystal body of synthetic quartz crystal and has a flat principal surface, comprises the steps of (a) converging a laser beam at a region in said quartz crystal block at a predetermined depth from the principal surface thereof to cause multiphoton phenomenon state, thereby breaking Si—O—Si bonds of quartz crystal in said region to form voids in said region, and (b) peeling said thin quartz crystal wafer from a body of said quartz crystal block along said voids. The above process is repeatedly performed on one quartz crystal block to peel off a plurality of thin quartz crystal wafers successively from the principal surface of the quartz crystal block. Each of the thin quartz crystal wafers is divided into individual quartz crystal blanks for making quartz crystal units.
    Type: Application
    Filed: December 26, 2003
    Publication date: July 15, 2004
    Applicant: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Akio Chiba, Kozo Ono, Tamotsu Kurosawa
  • Publication number: 20040126598
    Abstract: An aluminum nitride sintered body produced by sintering under pressure of a powder composition comprising aluminum nitride and 5 to 30% by weight of at least one sintering aid selected from the group consisting of Nd, Sm, Eu, Er, Dy, Gd, Pr and Yb, per 100% by weight of the powders of aluminum nitride and the sintering aid, wherein the amount of the sintering aid is a conversion value as oxides of the elements, the sintering body that has been subjected to mirror-polishing having a surface roughness R max of 0.2 &mgr;m or less and a thermal conductivity of 200 (W/mK) or more.
    Type: Application
    Filed: July 30, 2003
    Publication date: July 1, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Shigeru Tanaka, Akio Chiba, Yasutaka Suzuki, Kazuhiro Hirose, Tamihito Kawahigashi
  • Publication number: 20040095199
    Abstract: A surface mount crystal unit comprising a crystal blank, a planar mounting substrate made of silicon and a cover having a shape with a recess and made of glass containing ions having high mobility. The mounting substrate and the cover are bonded by means of anode bonding and the crystal blank is hermetically sealed in a case made up of the mounting substrate and the cover. The mounting substrate has connection electrodes used for a connection with the crystal blank and external terminals to be used to surface-mount the crystal unit. The connection electrodes and external terminals are electrically connected.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 20, 2004
    Inventors: Kozo Ono, Akio Chiba
  • Publication number: 20040085004
    Abstract: A tuning fork type quartz crystal unit has a base and a pair of arms extending from respective ends of the base in a crystallographic Y direction of quartz crystal. Each of the arms comprises a first crystal member and a second crystal member which extend in the Y direction. The first crystal member and the second crystal member are joined to each other in a crystallographic YZ plane by a direct bonding such that the first crystal member and the second crystal member have respective crystallographic X directions oriented away from each other and extending parallel to each other. Each of the arms has excitation electrodes disposed respectively on a pair of exposed surfaces thereof which lie in the YZ plane. The direct bonding comprises, for example, a siloxane bond by which the first crystal member and the second crystal member are joined to each other.
    Type: Application
    Filed: October 30, 2003
    Publication date: May 6, 2004
    Applicant: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Akio Chiba, Minoru Ishihara, Tamotsu Kurosawa
  • Publication number: 20030006853
    Abstract: Excitation electrodes are respectively affixed to central portions of both surfaces of a long plate-shaped AT-cut crystal resonator, the central portion starts a thickness shear oscillation in the length direction of the crystal resonator when an electric signal is applied to the central portion of the crystal resonator through the excitation electrodes. And, channel-shaped, half-circular-shaped, or trapezoid grooves in cross-section are respectively formed in the plate width direction on middle portions between the center portion and end portions of the crystal resonator. These grooves are formed so as to be symmetrical with respect to a thicknesswise central position of the crystal resonator through a well-known etching technique such as photo-etching and the like.
    Type: Application
    Filed: June 5, 2002
    Publication date: January 9, 2003
    Inventors: Masami Yamanaka, Motoyuki Adachi, Akio Chiba, Kozo Ono
  • Publication number: 20020078762
    Abstract: A load sensor measuring a load by a change in oscillation frequency of a crystal (quartz) blank due to stress sensibility against thereof when a load is applied to opposing outer circumferential portions of the crystal blank. In the sensor, the crystal blank is formed in a shape such that when the load is applied, any mechanical deformation in a direction perpendicular to the plane of the blank is prevented. For example, the crystal blank is constituted by two regions, a vibrating portion having a relatively small thickness and a protective frame portion having a relatively large thickness. Alternatively, in a planar blank, a groove is formed so as to extend along the outer circumference of the blank. In the rectangular blank, the frame portion or groove is preferably arranged along sides of the blank parallel with a direction in which the load is applied.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 27, 2002
    Applicant: NIHON DEMPA KOGYO CO., LTD
    Inventors: Akio Chiba, Kozo Ono, Masami Yamanaka, Motoyuki Adachi
  • Patent number: 5266860
    Abstract: A commutator has a central support supporting a plurality of conductive segments separated by a plurality of insulative segments. In addition to providing an insulative function between the conductive segments, the dielectric constant, the area, and the thickness of the insulative segments are chosen so that they provide a capacitive effect, which capacitive effect suppresses current peaks during operation of the commutator. Preferably, the dielectric constant is greater than 10. The central support may include a metal shaft and an insulating ring, which insulating ring is preferably of material with a lower dielectric constant thereby to suppress-shorting between the shaft and the conductive segments. It is particularly advantageous if the conductive and insulative segments are of ceramics material since this provides good wear resistance. In further alternatives, capacitors are formed between the conductive segments by rings or other bodies of insulative materials of a suitably high dielectric constant.
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: November 30, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Akio Chiba, Masahisa Sobue, Kazuo Tahara, Nobuyuki Yamashita, Shun Suzuki
  • Patent number: 5208502
    Abstract: Ceramics material are not resistant to tensile force, though they are resistant to compression force. Therefore, ceramics materials, when used as the material of a commutator of an electric rotary machine, tends to be cracked and broken due to tensile stress generated in the inner peripheral portion of the commutator when the latter is press-fitted on the rotor shaft of the machine. The invention is aimed at obviating the above-described problem, so as to make it possible to produce a sliding current collector of an electric rotary machine from a ceramics material. To this end, according to the invention, an annular gap is formed between the inner peripheral surface of the ceramics commutator and the other peripheral surface of the rotary shaft and the gap is filled with a resin such as a thermosetting resin which is then thermally set to form a resin layer by which the commutator is bonded to the rotor shaft.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: May 4, 1993
    Assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd.
    Inventors: Nobuyuki Yamashita, Kazuo Tahara, Akio Chiba, Masahisa Sobue, Toshimi Abukawa, Shin'ichi Sakamoto, Shun Suzuki
  • Patent number: 5200373
    Abstract: The present invention is a composite ceramic structure having a porosity of 5 to 40% by volume comprising particles selected from the group consisting of grains and whiskers of at least one inorganic compound AB, where B is oxygen, nitrogen or carbon and A is any metal so the difference in electronegativity between A and B is less than 1.7; or particles selected from the group consisting of grains and whiskers of an inorganic compound, where there is a difference of 1.7 and higher between the components, and having layers of the inorganic compound AB formed on the surfaces of the particles. The particles are bonded together by silicon nitride particles having an average particle size of less than 0.2 micron.
    Type: Grant
    Filed: March 18, 1991
    Date of Patent: April 6, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiyuki Yasutomi, Seiji Watahiki, Junji Sakai, Akio Chiba, Tadahiko Miyoshi, Masahisa Sobue
  • Patent number: 4727955
    Abstract: In a motor vehicle having in an engine room a carbon canister for adsorbing a vapor from a fuel tank, there is provided a vapor diffusing device which comprises a front side channel member extending in the engine room from a front portion of the vehicle toward a passenger room of the same, a structure incorporated with a part of the channel member to define an enclosed chamber, a first arrangement for fluidly connecting the interior of the enclosed chamber with a purge air opening of the carbon canister, and a second arrangement for defining a vapor diffusing opening through which the interior of the enclosed chamber is exposed to the interior of the engine room.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: March 1, 1988
    Assignee: Nissan Motor Company, Ltd.
    Inventors: Masazi Honda, Akio Chiba, Hirotaka Tomioka