Patents by Inventor Masaki Oikawa
Masaki Oikawa 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: 20230262905Abstract: A joint structure, in which an electronic component and a wiring substrate are joined to each other, includes: a base material of the electronic component; a base material of the wiring substrate; and a joint portion that includes at least an electrode of the electronic component and an electrode of the wiring substrate, and that joins the base material of the electronic component and the base material of the wiring substrate. The joint portion includes a material having an absorption coefficient of 2×10{circumflex over (?)}5 cm?1 or more for light of a wavelength of 250 to 1000 nm. The base material of at least one component of the electronic component and the wiring substrate consists of a material having an absorption coefficient of 1.5×10{circumflex over (?)}5 cm?1 or less for the light of a wavelength of 250 to 1000 nm.Type: ApplicationFiled: August 19, 2021Publication date: August 17, 2023Applicant: TDK CorporationInventors: Ryohei KASAI, Masaki OIKAWA, Susumu TANIGUCHI, Kenichi KAWABATA
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Patent number: 11173713Abstract: A liquid discharge head includes a flow passage forming member, an element substrate including a liquid discharge element and a surface on which a conductive member made from a metallic material is disposed, and an intermediate layer made from a resin material and configured to join the flow passage forming member and the surface of the element substrate to each other. The intermediate layer is disposed in a state, separated from the conductive member, where the conductive member is exposed from the intermediate layer. The conductive member is covered with the flow passage forming member.Type: GrantFiled: March 24, 2020Date of Patent: November 16, 2021Assignee: Canon Kabushiki KaishaInventors: Tomohiro Sato, Koichi Ishida, Masaki Oikawa, Yoshinori Misumi, Maki Kato, Yuzuru Ishida, Tsubasa Funabashi
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Patent number: 11077658Abstract: A liquid injection head improving electric reliability includes: a substrate including: energy generating elements configured to apply energy for ejection to a liquid, and a substrate upper surface on which terminals respectively connected to electric wirings are provided, an ejection port forming member having: an ejection port forming surface in which the ejection ports for ejecting a liquid are formed, and a back surface on a side opposite to the ejection port forming surface, which is arranged so as to opposite to the substrate upper surface, and a sealant configured to cover connecting portions between the electric wirings and the terminals.Type: GrantFiled: August 29, 2019Date of Patent: August 3, 2021Assignee: Canon Kabushiki KaishaInventors: Tomoki Ishiwata, Shuzo Iwanaga, Masaki Oikawa, Keiji Tomizawa, Tomohiro Sato, Akiko Hammura, Chiaki Muraoka, Shimpei Yoshikawa
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Patent number: 11027543Abstract: A printing apparatus measures a temperature of an electrothermal transducer by a corresponding temperature detection element, detects, based on the measured temperature, a peak voltage which indicates a point of change, from a state where ink is discharged normally from a printhead to a state where the ink is not discharged from the printhead, and compares the peak voltage with a threshold value. The measurement, detection, and comparison are repeated until the peal voltage becomes equal to or more than the threshold value. Energy supplied to the electrothermal transducer at a time in which the peak voltage is determined to be equal to or more than the threshold is determined to be minimum discharge energy.Type: GrantFiled: December 3, 2019Date of Patent: June 8, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Takatsugu Moriya, Masaki Oikawa, Nobuyuki Hirayama, Hiroyasu Nomura
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Publication number: 20200316941Abstract: A liquid discharge head includes a flow passage forming member, an element substrate including a liquid discharge element and a surface on which a conductive member made from a metallic material is disposed, and an intermediate layer made from a resin material and configured to join the flow passage forming member and the surface of the element substrate to each other. The intermediate layer is disposed in a state, separated from the conductive member, where the conductive member is exposed from the intermediate layer. The conductive member is covered with the flow passage forming member.Type: ApplicationFiled: March 24, 2020Publication date: October 8, 2020Inventors: Tomohiro Sato, Koichi Ishida, Masaki Oikawa, Yoshinori Misumi, Maki Kato, Yuzuru Ishida, Tsubasa Funabashi
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Publication number: 20200180308Abstract: A printing apparatus measures a temperature of an electrothermal transducer by a corresponding temperature detection element, detects, based on the measured temperature, a peak voltage which indicates a point of change, from a state where ink is discharged normally from a printhead to a state where the ink is not discharged from the printhead, and compares the peak voltage with a threshold value. The measurement, detection, and comparison are repeated until the peal voltage becomes equal to or more than the threshold value. Energy supplied to the electrothermal transducer at a time in which the peak voltage is determined to be equal to or more than the threshold is determined to be minimum discharge energy.Type: ApplicationFiled: December 3, 2019Publication date: June 11, 2020Inventors: Takatsugu Moriya, Masaki Oikawa, Nobuyuki Hirayama, Hiroyasu Nomura
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Publication number: 20200070513Abstract: A liquid injection head improving electric reliability includes: a substrate including: energy generating elements configured to apply energy for ejection to a liquid, and a substrate upper surface on which terminals respectively connected to electric wirings are provided, an ejection port forming member having: an ejection port forming surface in which the ejection ports for ejecting a liquid are formed, and a back surface on a side opposite to the ejection port forming surface, which is arranged so as to opposite to the substrate upper surface, and a sealant configured to cover connecting portions between the electric wirings and the terminals.Type: ApplicationFiled: August 29, 2019Publication date: March 5, 2020Inventors: Tomoki Ishiwata, Shuzo Iwanaga, Masaki Oikawa, Keiji Tomizawa, Tomohiro Sato, Akiko Hammura, Chiaki Muraoka, Shimpei Yoshikawa
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Patent number: 10322578Abstract: A liquid ejection head includes a substrate including an electrically insulating film, an energy generating element provided on the substrate and configured to generate energy used to eject a liquid, a flow path formed through the substrate and communicating with an ejection port configured to eject a liquid, and a wiring layer formed in the electrically insulating film of the substrate, used to drive the energy generating element, provided apart from a wall defining the flow path, and provided to surround the flow path in a plan view of the substrate.Type: GrantFiled: June 12, 2018Date of Patent: June 18, 2019Assignee: Canon Kabushiki KaishaInventors: Tomoko Kudo, Takaaki Yamaguchi, Keiji Tomizawa, Masaki Oikawa, Yoshihiro Hamada, Masataka Sakurai
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Publication number: 20180361734Abstract: A liquid ejection head includes a substrate including an electrically insulating film, an energy generating element provided on the substrate and configured to generate energy used to eject a liquid, a flow path formed through the substrate and communicating with an ejection port configured to eject a liquid, and a wiring layer formed in the electrically insulating film of the substrate, used to drive the energy generating element, provided apart from a wall defining the flow path, and provided to surround the flow path in a plan view of the substrate.Type: ApplicationFiled: June 12, 2018Publication date: December 20, 2018Inventors: Tomoko Kudo, Takaaki Yamaguchi, Keiji Tomizawa, Masaki Oikawa, Yoshihiro Hamada, Masataka Sakurai
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Patent number: 10040285Abstract: A liquid ejection head, including: a flow path forming member including a resin layer having an ejection orifice and a flow path formed therein; a substrate including a heat-generating resistance element for ejecting liquid and a protective layer having a portion for covering the heat-generating resistance element, a surface of the portion being exposed to the flow path; and an intermediate layer formed between the resin layer and the protective layer, the intermediate layer including a silicon carbonitride material.Type: GrantFiled: August 5, 2016Date of Patent: August 7, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Masaki Oikawa, Yoshihiro Hamada, Takuya Hatsui, Makoto Sakurai, Takeru Yasuda
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Patent number: 9975334Abstract: A liquid discharging head includes a recording element board in which a plurality of discharge ports configured to discharge liquid are arrayed in a first direction, a support member configured to support the recording element board and including a common liquid chamber extending in the first direction to supply the liquid to the plurality of discharge ports and a buffer chamber configured to have an opening in a ceiling surface of the common liquid chamber opposed to the recording element board and to hold a bubble, and a heater located in a region of the recording element board opposed to a part of the ceiling surface extending from the opening of the buffer chamber to an end portion in the first direction and configured to generate heat when the liquid is not discharged from the plurality of discharge ports.Type: GrantFiled: July 21, 2016Date of Patent: May 22, 2018Assignee: Canon Kabushiki KaishaInventors: Takuma Kodoi, Masaki Oikawa
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Patent number: 9630409Abstract: A liquid discharge head includes a print element substrate provided with discharge ports, through which liquid is discharged; and a support member having a liquid chamber, which is provided with a communicating opening that communicates with the discharge ports, wherein the liquid chamber has a first surface provided with the communicating opening, and a second surface facing the first surface, the second surface is provided with a buffer chamber, which is a hollow space for storing gas, and the buffer chamber has, in the second surface, an opening having a projecting portion projecting toward the inner side of the opening.Type: GrantFiled: July 20, 2016Date of Patent: April 25, 2017Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Hamada, Masaki Oikawa, Hiroshi Yamada, Atsushi Omura, Takuma Kodoi, Tomotsugu Kuroda, Tomoyuki Tenkawa, Monta Matsui
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Patent number: 9630405Abstract: A printing element substrate is provided that can provide an accurate temperature detection of a printing element substrate and that can suppress the printing element substrate from having a larger size. In order to realize this, sensors are arranged along the heating resistor elements arranged in the printing element substrate so that more diode sensors are arranged at a higher density in a part having a higher temperature change of the printing element substrate during the liquid ejection operation from the ejection openings.Type: GrantFiled: July 6, 2015Date of Patent: April 25, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Toshikazu Nagatsuka, Masaki Oikawa, Atsushi Omura
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Patent number: 9616664Abstract: Provided is a liquid ejection head, including: an ejection unit including: a recording element substrate including a plurality of recording elements configured to generate energy; and a support member formed of a plate-like member and configured to support the recording element substrate, the support member including: a liquid chamber configured to store liquid therein, and an inlet formed in the liquid chamber so as to allow the liquid to flow into the liquid chamber; a flow path unit including a liquid path through which the liquid is supplied into the ejection unit from a liquid tank storing the liquid therein; a joint member sandwiched between the support member and the flow path unit and configured to seal the liquid; and a buffer chamber formed in a space defined by the joint member, the ejection unit, and the flow path unit and configured to retain gas therein.Type: GrantFiled: July 6, 2016Date of Patent: April 11, 2017Assignee: Canon Kabushiki KaishaInventors: Masaki Oikawa, Hiroshi Yamada, Atsushi Omura, Satoshi Kimura, Kousuke Nakahata
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Publication number: 20170057228Abstract: A liquid ejection head, including: a flow path forming member including a resin layer having an ejection orifice and a flow path formed therein; a substrate including a heat-generating resistance element for ejecting liquid and a protective layer having a portion for covering the heat-generating resistance element, a surface of the portion being exposed to the flow path; and an intermediate layer formed between the resin layer and the protective layer, the intermediate layer including a silicon carbonitride material.Type: ApplicationFiled: August 5, 2016Publication date: March 2, 2017Inventors: Masaki Oikawa, Yoshihiro Hamada, Takuya Hatsui, Makoto Sakurai, Takeru Yasuda
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Publication number: 20170021621Abstract: A liquid discharge head includes a print element substrate provided with discharge ports, through which liquid is discharged; and a support member having a liquid chamber, which is provided with a communicating opening that communicates with the discharge ports, wherein the liquid chamber has a first surface provided with the communicating opening, and a second surface facing the first surface, the second surface is provided with a buffer chamber, which is a hollow space for storing gas, and the buffer chamber has, in the second surface, an opening having a projecting portion projecting toward the inner side of the opening.Type: ApplicationFiled: July 20, 2016Publication date: January 26, 2017Inventors: Yoshihiro Hamada, Masaki Oikawa, Hiroshi Yamada, Atsushi Omura, Takuma Kodoi, Tomotsugu Kuroda, Tomoyuki Tenkawa, Monta Matsui
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Publication number: 20170021627Abstract: A liquid discharging head includes a recording element board in which a plurality of discharge ports configured to discharge liquid are arrayed in a first direction, a support member configured to support the recording element board and including a common liquid chamber extending in the first direction to supply the liquid to the plurality of discharge ports and a buffer chamber configured to have an opening in a ceiling surface of the common liquid chamber opposed to the recording element board and to hold a bubble, and a heater located in a region of the recording element board opposed to a part of the ceiling surface extending from the opening of the buffer chamber to an end portion in the first direction and configured to generate heat when the liquid is not discharged from the plurality of discharge ports.Type: ApplicationFiled: July 21, 2016Publication date: January 26, 2017Inventors: Takuma Kodoi, Masaki Oikawa
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Publication number: 20170021620Abstract: Provided is a liquid ejection head, including: an ejection unit including: a recording element substrate including a plurality of recording elements configured to generate energy; and a support member formed of a plate-like member and configured to support the recording element substrate, the support member including: a liquid chamber configured to store liquid therein, and an inlet formed in the liquid chamber so as to allow the liquid to flow into the liquid chamber; a flow path unit including a liquid path through which the liquid is supplied into the ejection unit from a liquid tank storing the liquid therein; a joint member sandwiched between the support member and the flow path unit and configured to seal the liquid; and a buffer chamber formed in a space defined by the joint member, the ejection unit, and the flow path unit and configured to retain gas therein.Type: ApplicationFiled: July 6, 2016Publication date: January 26, 2017Inventors: Masaki Oikawa, Hiroshi Yamada, Atsushi Omura, Satoshi Kimura, Kousuke Nakahata
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Patent number: 9266325Abstract: The print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening arranged in a position corresponding to the energy generating element. The ejection opening includes at least one projection projecting inside of the ejection opening, the ejection opening having a first region between a front end of the projection and an inner wall of the ejection opening positioned at the shortest distance from the front end, and second regions positioned on both sides of the projection and different from the first region, and when a width of the projection at a chamber-side opening face is represented as a1 and the maximum width of the projection is represented as a2, a relation a1<a2 is established and the width of the projection decreases gradually or step by step from a position having the width of a2 to the chamber-side opening face.Type: GrantFiled: August 10, 2012Date of Patent: February 23, 2016Assignee: Canon Kabushiki KaishaInventors: Keiji Tomizawa, Masaki Oikawa
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Publication number: 20160009078Abstract: A printing element substrate is provided that can provide an accurate temperature detection of a printing element substrate and that can suppress the printing element substrate from having a larger size. In order to realize this, sensors are arranged along the heating resistor elements arranged in the printing element substrate so that more diode sensors are arranged at a higher density in a part having a higher temperature change of the printing element substrate during the liquid ejection operation from the ejection openings.Type: ApplicationFiled: July 6, 2015Publication date: January 14, 2016Inventors: Toshikazu Nagatsuka, Masaki Oikawa, Atsushi Omura