Patents by Inventor Takefumi Saito
Takefumi Saito 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: 20240105391Abstract: A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrode layers alternately laminated therein, base electrode layers respectively provided on both end surfaces of the multilayer body in a length direction intersecting a lamination direction, and each connected to the internal electrode layers and each including glass and copper, and plated layers respectively provided on an outer side of the base electrode layers. A protective layer including sulfur is provided between the glass included in the base electrode layers and the plated layers.Type: ApplicationFiled: November 30, 2023Publication date: March 28, 2024Inventors: Keita KITAHARA, Yuta SAITO, Noriyuki OOKAWA, Riyousuke AKAZAWA, Takefumi TAKAHASHI, Masahiro WAKASHIMA, Yuta KUROSU, Akito MORI
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Patent number: 8907549Abstract: A vibrator includes a base substrate, a tuning fork type vibrating body, a first vibrating body, a second vibrating body, a first extraction electrode at the one vibration arm portion, a second extraction electrode at the other vibration arm portion, and an input/output port at the base portion. The input/output port is configured to input/output an electric signal to/from each of the first extraction electrode, the second extraction electrode, and the excitation electrodes of the vibration arm portions. The tuning fork type vibrating body is configured to generate a flexural vibration in reverse phase to the contour vibration of the first and second vibrating bodies, so as to absorb the contour vibration of the first and second vibrating bodies.Type: GrantFiled: September 5, 2012Date of Patent: December 9, 2014Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Takefumi Saito, Noritoshi Kimura
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Patent number: 8456065Abstract: Surface-mounted piezoelectric devices are disclosed, of which an exemplary device includes a tuning-fork type piezoelectric vibrating piece having a base portion and a pair of vibrating arms extending from the base portion. The device includes a package defined by a wall. The package includes a cavity accommodating the tuning-fork type piezoelectric vibrating piece and at least one columnar body situated between the vibrating arms in the cavity.Type: GrantFiled: September 13, 2010Date of Patent: June 4, 2013Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Yoshiaki Amano, Takefumi Saito
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Publication number: 20130134837Abstract: In order to provide complete removal of a sacrificial layer on a bottom surface of a disk during an etching process, without leaving residue, a disk type resonator of an electrostatic drive type includes a disk type resonator structure; a pair of drive electrodes at a predetermined gap from an outer peripheral portion of the disk type resonator structure and disposed at both sides of the resonator structure so as to face each other; a unit for applying an alternating current bias voltage with a same phase to the drive electrodes; and a detection unit that obtains an output corresponding to an electrostatic capacitance between the disk type resonator structure and the drive electrodes. The disk type resonator structure has a through hole in the center of the disk and is vibrated in a wineglass mode.Type: ApplicationFiled: June 13, 2011Publication date: May 30, 2013Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Takefumi Saito, Noritoshi Kimura
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Publication number: 20130134829Abstract: A variation in a resonance frequency due to variation in dimension accuracy of the supporting structure of the vibrating unit is reduced, and energy loss leaked from the supporting structure is reduced as much as possible. The electrostatic drive disk-type MEMS vibrator includes: a disk type vibrating unit; drive electrodes disposed at a prescribed gap g from the peripheral portion of the disk type vibrating unit and disposed at both sides of the vibrating unit so as to face each other; a unit for applying alternating current bias voltages of the same phase to the drive electrodes; and detection units that obtain outputs corresponding to the capacitance between the disk type vibrating unit and the drive electrodes. The disk type vibrating unit is supported by a pillar-shaped supporting structure disposed upright at the center of the disk and a transverse cross-sectional shape of the supporting structure is non-circular.Type: ApplicationFiled: June 13, 2011Publication date: May 30, 2013Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: Takefumi Saito, Noritoshi Kimura
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Publication number: 20130057115Abstract: A vibrator includes a base substrate, a tuning fork type vibrating body, a first vibrating body, a second vibrating body, a first extraction electrode at the one vibration arm portion, a second extraction electrode at the other vibration arm portion, and an input/output port at the base portion. The input/output port is configured to input/output an electric signal to/from each of the first extraction electrode, the second extraction electrode, and the excitation electrodes of the vibration arm portions. The tuning fork type vibrating body is configured to generate a flexural vibration in reverse phase to the contour vibration of the first and second vibrating bodies, so as to absorb the contour vibration of the first and second vibrating bodies.Type: ApplicationFiled: September 5, 2012Publication date: March 7, 2013Applicant: NIHON DEMPA KOGYO CO., LTD.Inventors: TAKEFUMI SAITO, NORITOSHI KIMURA
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Patent number: 8227958Abstract: An exemplary piezoelectric vibrating device includes a piezoelectric frame that supports and surrounds a tuning-fork type piezoelectric vibrating piece having a pair of vibrating arms. The device also includes a lid and a package base that are siloxane-bonded to the frame. The lid defines at least one frequency-adjustment hole extending through the thickness dimension of the lid from an inner major surface thereof (facing the frame) to an outer major surface of the lid. The package base defines at least one through-hole electrode passing via a respective electrode through-hole through the thickness of the base from an inner major surface thereof (facing the frame) to the outer major surface thereof. The electrode is connected to the piezoelectric vibrating piece. The lid and base include external electrodes, made of an electrically conductive material, that cover the through-holes and frequency-adjustment hole(s).Type: GrantFiled: February 10, 2010Date of Patent: July 24, 2012Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Takahiro Inoue, Takefumi Saito, Mitoshi Umeki, Ryoichi Ichikawa
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Patent number: 8203256Abstract: A tuning-fork type crystal vibrating piece (20) is comprised of a base portion (23) comprising a piezoelectric material, a pair of parallel vibrating arms (21) with a designated thickness (D3) and width (W3) extend from the base portion, and a pair of weight portions (28) are formed by enlarging the width (W4) of the distal ends pair of vibrating arms. A cross-section of the pair of weight portions is formed symmetric with a central axis which is center of the pair of vibrating arms, and at least one portion of the pair of weight portions has a thickness which is less than the designated thickness (D3).Type: GrantFiled: February 9, 2010Date of Patent: June 19, 2012Assignee: Nihon Dempa Kogyo Co., Ltd.Inventor: Takefumi Saito
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Patent number: 8120233Abstract: Methods are disclosed for manufacturing piezoelectric vibrating pieces and devices including such pieces. According to an embodiment of the method, a piezoelectric vibrating piece is produced from a piezoelectric wafer. To form the piece, a profile of the piezoelectric vibrating piece is formed in a piezoelectric wafer. A first metal film (chromium; Cr) is formed on the surface of the piezoelectric piece. The chromium film is surface-oxidized to form a film having Cr foundation layer and an oxidized surface. A second metal film (gold; Au) is formed on the oxidized surface. Then, in selected regions not destined to become electrodes, the second metal film is removed, leaving electrode patterns at designated regions of the piezoelectric vibrating piece.Type: GrantFiled: December 3, 2009Date of Patent: February 21, 2012Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Mitoshi Umeki, Takahiro Inoue, Yoshiaki Amano, Takefumi Saito
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Patent number: 8018126Abstract: Surface-mounted piezoelectric devices are disclosed that include a package having a base and a lid made of a piezoelectric material or of glass. The package defines an internal cavity containing a tuning-fork type crystal vibrating piece having a pair of vibrating arms. The volume of the cavity is at least twelve times the volume of the pair of vibrating arms. Piezoelectric devices having these characteristics exhibit reduced CI degradation.Type: GrantFiled: August 18, 2010Date of Patent: September 13, 2011Assignee: Nihon Dempa Kogyo Co., Ltd.Inventors: Mitoshi Umeki, Takefumi Saito, Ryoichi Ichikawa
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Patent number: 7947187Abstract: When forming an opening conforming to a groove of a quartz resonator in a metal film serving as a mask of the quartz resonator by conducting etching, the outer periphery of the metal film is wavingly etched. Therefore, when the groove is formed on the quartz resonator, the quartz resonator is formed according to the above-described metal film, which results in appearance defects or dimension defects. In order to solve the problems, the outer shape of the metal film is formed smaller than the outer shape of the quartz resonator before forming the opening conforming to the groove of the quartz resonator in the metal film, then etching of the metal film and etching of the quartz resonator are performed.Type: GrantFiled: September 18, 2007Date of Patent: May 24, 2011Assignee: Nihon Dempa Kogyo Co., Ltd.Inventor: Takefumi Saito
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Patent number: 7932662Abstract: Crystal devices are disclosed that include a crystal frame having a crystal vibrating piece and an outer frame. The crystal vibrating piece includes excitation electrodes, and the outer frame supports the crystal vibrating piece. Each device has a base including connection electrodes on a first surface thereof and respective external electrodes on a second surface thereof, wherein the connection electrodes are electrically connected via respective through-holes to respective excitation electrodes and to respective external electrodes. The first surface of the base is bonded to the under-surface of the outer frame, and an upper surface of the outer frame is bonded to a crystal lid. The through-holes have non-circular transverse profiles and are filled with a sealing material such as a metal.Type: GrantFiled: January 12, 2009Date of Patent: April 26, 2011Assignee: Nihon Dempa Kogyo Co., Ltd.Inventor: Takefumi Saito
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Publication number: 20110062831Abstract: Surface-mounted piezoelectric devices are disclosed, of which an exemplary device includes a tuning-fork type piezoelectric vibrating piece having a base portion and a pair of vibrating arms extending from the base portion. The device includes a package defined by a wall. The package includes a cavity accommodating the tuning-fork type piezoelectric vibrating piece and at least one columnar body situated between the vibrating arms in the cavity.Type: ApplicationFiled: September 13, 2010Publication date: March 17, 2011Inventors: Yoshiaki Amano, Takefumi Saito
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Publication number: 20110062826Abstract: Surface-mounted piezoelectric devices are disclosed that include a package having a base and a lid made of a piezoelectric material or of glass. The package defines an internal cavity containing a tuning-fork type crystal vibrating piece having a pair of vibrating arms. The volume of the cavity is at least twelve times the volume of the pair of vibrating arms. Piezoelectric devices having these characteristics exhibit reduced CI degradation.Type: ApplicationFiled: August 18, 2010Publication date: March 17, 2011Inventors: Mitoshi Umeki, Takefumi Saito, Ryoichi Ichikawa
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Publication number: 20100201221Abstract: An exemplary piezoelectric vibrating device includes a piezoelectric frame that supports and surrounds a tuning-fork type piezoelectric vibrating piece having a pair of vibrating arms. The device also includes a lid and a package base that are siloxane-bonded to the frame. The lid defines at least one frequency-adjustment hole extending through the thickness dimension of the lid from an inner major surface thereof (facing the frame) to an outer major surface of the lid. The package base defines at least one through-hole electrode passing via a respective electrode through-hole through the thickness of the base from an inner major surface thereof (facing the frame) to the outer major surface thereof. The electrode is connected to the piezoelectric vibrating piece. The lid and base include external electrodes, made of an electrically conductive material, that cover the through-holes and frequency-adjustment hole(s).Type: ApplicationFiled: February 10, 2010Publication date: August 12, 2010Inventors: Takahiro Inoue, Takefumi Saito, Mitoshi Umeki, Ryoichi Ichikawa
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Publication number: 20100201229Abstract: A tuning-fork type crystal vibrating piece (20) is comprised of a base portion (23) comprising a piezoelectric material, a pair of parallel vibrating arms (21) with a designated thickness (D3) and width (W3) extend from the base portion, and a pair of weight portions (28) are formed by enlarging the width (W4) of the distal ends pair of vibrating arms. A cross-section of the pair of weight portions is formed symmetric with a central axis which is center of the pair of vibrating arms, and at least one portion of the pair of weight portions has a thickness which is less than the designated thickness (D3).Type: ApplicationFiled: February 9, 2010Publication date: August 12, 2010Applicant: NIHON DEMPA KOGYO CO., LTD.Inventor: Takefumi SAITO
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Publication number: 20100133958Abstract: Methods are disclosed for manufacturing piezoelectric vibrating pieces and devices including such pieces. According to an embodiment of the method, a piezoelectric vibrating piece is produced from a piezoelectric wafer. To form the piece, a profile of the piezoelectric vibrating piece is formed in a piezoelectric wafer. A first metal film (chromium; Cr) is formed on the surface of the piezoelectric piece. The chromium film is surface-oxidized to form a film having Cr foundation layer and an oxidized surface. A second metal film (gold; Au) is formed on the oxidized surface. Then, in selected regions not destined to become electrodes, the second metal film is removed, leaving electrode patterns at designated regions of the piezoelectric vibrating piece.Type: ApplicationFiled: December 3, 2009Publication date: June 3, 2010Inventors: Mitoshi Umeki, Takahiro Inoue, Yoshiaki Amano, Takefumi Saito
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Publication number: 20090179524Abstract: Crystal devices are disclosed that include a crystal frame having a crystal vibrating piece and an outer frame. The crystal vibrating piece includes excitation electrodes, and the outer frame supports the crystal vibrating piece. Each device has a base including connection electrodes on a first surface thereof and respective external electrodes on a second surface thereof, wherein the connection electrodes are electrically connected via respective through-holes to respective excitation electrodes and to respective external electrodes. The first surface of the base is bonded to the under-surface of the outer frame, and an upper surface of the outer frame is bonded to a crystal lid. The through-holes have non-circular transverse profiles and are filled with a sealing material such as a metal.Type: ApplicationFiled: January 12, 2009Publication date: July 16, 2009Inventor: Takefumi Saito
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Publication number: 20080073318Abstract: When forming an opening conforming to a groove of a quartz resonator in a metal film serving as a mask of the quartz resonator by conducting etching, the outer periphery of the metal film is wavingly etched. Therefore, when the groove is formed on the quartz resonator, the quartz resonator is formed according to the above-described metal film, which results in appearance defects or dimension defects. In order to solve the problems, the outer shape of the metal film is formed smaller than the outer shape of the quartz resonator before forming the opening conforming to the groove of the quartz resonator in the metal film, then etching of the metal film and etching of the quartz resonator are performed.Type: ApplicationFiled: September 18, 2007Publication date: March 27, 2008Inventor: Takefumi Saito