Patents by Inventor Hitoshi TAKAAI
Hitoshi TAKAAI 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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Patent number: 11951740Abstract: A communication plate in which are provided a first communication channel communicating with the first pressure chamber and the second pressure chamber and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at positions different from positions at which the first communication channel communicates with the first pressure chamber and the second pressure chamber, and a nozzle substrate in which a first nozzle communicating with the first pressure chamber and the second pressure chamber in common via the first communication channel is provided. A second communication channel communicating with the first common liquid chamber and communicating with the first pressure chamber and the second pressure chamber in common is provided in the pressure chamber substrate or the communication plate.Type: GrantFiled: January 25, 2022Date of Patent: April 9, 2024Assignee: Seiko Epson CorporationInventors: Shotaro Tamai, Takahiro Katakura, Takanori Aimono, Yuta Okawa, Hitoshi Takaai
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Publication number: 20240066861Abstract: a first compliance portion provided at a position on the first side of a coupling area in the common flow path where the common flow path is coupled to the plurality of individual flow paths; and a second compliance portion, different from the first compliance portion, provided at a position on a second side of the coupling area in the common flow path, the second side being the other side in the second direction and being opposite to the first side, and the first compliance portion and the second compliance portion have an overlapping portion where the first compliance portion and the second compliance portion partially overlap each other as viewed in the second direction.Type: ApplicationFiled: August 29, 2023Publication date: February 29, 2024Inventors: Yu SHIOZAWA, Hitoshi TAKAAI, Motoki TAKABE, Eiju HIRAI, Takahiro KANEGAE
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Publication number: 20240066868Abstract: A liquid ejecting head includes: a nozzle substrate having a nozzle configured to eject liquid; a pressure chamber substrate having a pressure chamber in which a pressure for ejecting liquid through the nozzle is applied to liquid and an absorption chamber adjacent to an upstream portion of the pressure chamber and configured to absorb vibration of liquid that occurs when a pressure is applied to the liquid in the pressure chamber; a first piezoelectric element associated with the pressure chamber and configured to be driven by voltage application; and a second piezoelectric element associated with the absorption chamber and configured to be driven independently of the first piezoelectric element by voltage application.Type: ApplicationFiled: August 29, 2023Publication date: February 29, 2024Inventors: Yu SHIOZAWA, Hitoshi TAKAAI, Takahiro KANEGAE, Eiju HIRAI
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Publication number: 20230294395Abstract: A liquid discharge device has a liquid discharge head that includes a pressure chamber substrate provided with a first pressure chamber in which a liquid is accommodated, a first piezoelectric body provided to correspond to the first pressure chamber, and a detection resistor for detecting a temperature in a vicinity of the first pressure chamber, and a decision section that decides a degree of deterioration of the first piezoelectric body based on a detection result of the detection resistor.Type: ApplicationFiled: March 15, 2023Publication date: September 21, 2023Inventors: Motoki TAKABE, Yu SHIOZAWA, Masaki MORI, Hitoshi TAKAAI, Eiju HIRAI
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Publication number: 20230182465Abstract: The controller drives the piezoelectric body such that, when the cumulative number of times of the driving is a second number of times greater than the first number of times, the voltage difference is a second value smaller than the first value.Type: ApplicationFiled: December 8, 2022Publication date: June 15, 2023Inventors: Yu SHIOZAWA, Masaki MORI, Motoki TAKABE, Hitoshi TAKAAI, Eiju HIRAI
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Publication number: 20230166506Abstract: A liquid discharge head includes an individual electrode that is individually provided for the plurality of pressure chambers, a common electrode that is commonly provided for the plurality of pressure chambers, a piezoelectric body that is provided between the individual electrode and the common electrode for applying pressure to liquid in the pressure chambers, a drive wiring that is electrically coupled to the individual electrode and the common electrode, and applies a voltage for driving the piezoelectric body, a detection resistor that is formed of the same material as any of the individual electrode, the common electrode, and the drive wiring for detecting temperature of the liquid in the pressure chambers, and a first layer that is provided on a surface opposite to a surface facing the pressure chamber substrate in the detection resistor, and has a lower thermal conductivity than the detection resistor.Type: ApplicationFiled: November 29, 2022Publication date: June 1, 2023Inventors: Yu SHIOZAWA, Masaki MORI, Motoki TAKABE, Hitoshi TAKAAI, Eiju HIRAI
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Publication number: 20230166498Abstract: A liquid discharge head includes a pressure chamber substrate that is provided with a plurality of pressure chambers, a piezoelectric body that is driven to apply pressure to liquid in the pressure chambers, an upper electrode that is provided above the piezoelectric body for applying a voltage to the piezoelectric body, a lower electrode that is provided below the piezoelectric body for applying a voltage to the piezoelectric body, a detection resistor that is provided below the piezoelectric body for detecting temperature of the liquid in the pressure chambers, and a first wiring portion that is electrically coupled to the detection resistor. The first wiring portion includes a first part that is extended above the piezoelectric body, and a second part that is provided in at least a part of a through hole penetrating the piezoelectric body and electrically coupled to the detection resistor.Type: ApplicationFiled: November 29, 2022Publication date: June 1, 2023Inventors: Masaki MORI, Yu SHIOZAWA, Hitoshi TAKAAI, Motoki TAKABE, Eiju HIRAI
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Publication number: 20230150259Abstract: A liquid ejecting head includes: a nozzle; a pressure chamber; a supply flow channel which is located on one side in a first direction relative to the pressure chamber and through which a liquid is supplied to the pressure chamber; a discharge flow channel which is located on another side in the first direction relative to the pressure chamber and through which the liquid is discharged from the pressure chamber; a supply-side compliance substrate which absorbs a vibration of the liquid in the supply flow channel; and a discharge-side compliance substrate which absorbs a vibration of the liquid in the discharge flow channel. A length of the discharge-side compliance substrate in the first direction is shorter than a length of the supply-side compliance substrate in the first direction.Type: ApplicationFiled: November 11, 2022Publication date: May 18, 2023Inventors: Yu SHIOZAWA, Motoki TAKABE, Hitoshi TAKAAI
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Publication number: 20230020673Abstract: A liquid discharge head includes a pressure chamber substrate that has a plurality of pressure chambers, a piezoelectric element that is laminated at the pressure chamber substrate, and has an individual electrode individually provided for each of the plurality of pressure chambers, a common electrode commonly provided for the plurality of pressure chambers, and a piezoelectric body provided between the individual electrode and the common electrode in a lamination direction of the piezoelectric element and provided to apply pressure to a liquid in the pressure chamber, a drive wiring that is electrically coupled to the individual electrode and the common electrode, and provided to apply a voltage for driving the piezoelectric body to the piezoelectric body, and a heating resistor that is formed of the same material as any of the individual electrode, the common electrode, and the drive wiring, and provided to heat the liquid in the pressure chamber.Type: ApplicationFiled: July 13, 2022Publication date: January 19, 2023Inventors: Masaki MORI, Yu SHIOZAWA, Motoki TAKABE, Hitoshi TAKAAI, Eiju HIRAI, Michiya KUBOKAWA
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Patent number: 11554584Abstract: a first sloped portion that is provided between the first wall surface and the third wall surface includes a first constituting surface that extends in a third direction between the first direction and the second direction.Type: GrantFiled: January 28, 2021Date of Patent: January 17, 2023Assignee: Seiko Epson CorporationInventors: Yoichi Naganuma, Yuma Fukuzawa, Hitoshi Takaai, Shotaro Tamai
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Publication number: 20220234354Abstract: A communication plate in which are provided a first communication channel communicating with the first pressure chamber and the second pressure chamber and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at positions different from positions at which the first communication channel communicates with the first pressure chamber and the second pressure chamber, and a nozzle substrate in which a first nozzle communicating with the first pressure chamber and the second pressure chamber in common via the first communication channel is provided. A second communication channel communicating with the first common liquid chamber and communicating with the first pressure chamber and the second pressure chamber in common is provided in the pressure chamber substrate or the communication plate.Type: ApplicationFiled: January 25, 2022Publication date: July 28, 2022Inventors: Shotaro TAMAI, Takahiro KATAKURA, Takanori AIMONO, Yuta OKAWA, Hitoshi TAKAAI
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Patent number: 11273642Abstract: A liquid ejecting head including a diaphragm constituting a portion of a wall surface of a pressure chamber that accommodates a liquid, and a piezoelectric element that vibrates the diaphragm. In the liquid ejecting head, the diaphragm includes a plurality of layers, and the plurality of layers include a compressive film that has compressive stress and a tensile film that has tensile stress. The compressive film and the tensile film are two layers adjacent to each other that have a largest tension difference among the plurality of layers, and an absolute value of the tension difference between the compressive film and the tensile film is 400 [N/m] or smaller.Type: GrantFiled: April 15, 2020Date of Patent: March 15, 2022Assignee: Seiko Epson CorporationInventors: Masanori Mikoshiba, Shiro Yazaki, Toshinao Shinbo, Hitoshi Takaai
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Publication number: 20210362498Abstract: A liquid ejecting head includes: a pressure chamber; a piezoelectric element that generates energy for applying pressure to an ink in the pressure chamber; a nozzle channel that extends in the X-axis direction and communicates with a nozzle for ejecting the ink; a supply communication channel which enables the pressure chamber and the nozzle channel to communicate with each other; a discharge communication channel which communicates with the nozzle channel; a wiring substrate electrically coupled to a drive circuit that drives the piezoelectric element; and a wiring section that electrically couples the wiring substrate and the piezoelectric element, in which, as viewed in the Z-axis direction orthogonal to the X-axis direction, the wiring section is provided at a position at which the wiring section overlaps the nozzle channel, and the wiring section extends in the ±Q direction, which differs from the X-axis direction.Type: ApplicationFiled: May 24, 2021Publication date: November 25, 2021Inventors: Shotaro TAMAI, Yoichi NAGANUMA, Yuma FUKUZAWA, Hitoshi TAKAAI, Eiju HIRAI
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Publication number: 20210237439Abstract: a first sloped portion that is provided between the first wall surface and the third wall surface includes a first constituting surface that extends in a third direction between the first direction and the second direction.Type: ApplicationFiled: January 28, 2021Publication date: August 5, 2021Inventors: Yoichi NAGANUMA, Yuma FUKUZAWA, Hitoshi TAKAAI, Shotaro TAMAI
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Patent number: 10926538Abstract: A liquid ejecting head including a diaphragm constituting a portion of a wall surface of a pressure chamber that accommodates a liquid, and a piezoelectric element that vibrates the diaphragm. In the liquid ejecting head, the diaphragm includes a plurality of layers, and d/D?0.25 is satisfied where D is a thickness of the diaphragm and d is a distance between a neutral axis of the diaphragm and an interface between two adjacent layers in which a tension difference is the largest in the plurality of layers.Type: GrantFiled: December 17, 2019Date of Patent: February 23, 2021Assignee: Seiko Epson CorporationInventors: Masanori Mikoshiba, Shiro Yazaki, Toshinao Shinbo, Hitoshi Takaai
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Patent number: 10850515Abstract: A liquid ejecting head including a plurality of pressure chambers in communication with nozzles that eject a liquid, a diaphragm that includes layers including a first layer and a second layer and that constitutes wall surfaces of the plurality of pressure chambers, a plurality of piezoelectric elements formed on a first region of the diaphragm, the piezoelectric elements each being formed to correspond to a corresponding one of the pressure chambers, and a barrier layer that is in contact with an interface between the first layer and the second layer in a second region of the diaphragm, the second region surrounding the first region.Type: GrantFiled: September 18, 2019Date of Patent: December 1, 2020Assignee: Seiko Epson CorporationInventors: Takanori Aimono, Masao Nakayama, Motoki Takabe, Hitoshi Takaai
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Patent number: 10843463Abstract: A liquid ejecting head that includes a first piezoelectric element and a second piezoelectric element, a first wire that extends in a first direction and that electrically couples the first piezoelectric element and a wiring substrate to each other, and a second wire that is adjacent to the first wire in a second direction intersecting the first direction and that extends in the first direction, the second wire electrically coupling the second piezoelectric element and the wiring substrate to each other. A first protrusion is formed on a surface of the first wire in a mounting area to where the wiring substrate is joined, and a second protrusion is formed on a surface of the second wire in the mounting area and at a position different from that of the first protrusion in the first direction.Type: GrantFiled: August 23, 2019Date of Patent: November 24, 2020Assignee: Seiko Epson CorporationInventors: Sosuke Yamasaki, Hitoshi Takaai, Yuma Fukuzawa, Yoshinobu Toyama
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Publication number: 20200331267Abstract: A liquid ejecting head including a diaphragm constituting a portion of a wall surface of a pressure chamber that accommodates a liquid, and a piezoelectric element that vibrates the diaphragm. In the liquid ejecting head, the diaphragm includes a plurality of layers, and the plurality of layers include a compressive film that has compressive stress and a tensile film that has tensile stress. The compressive film and the tensile film are two layers adjacent to each other that have a largest tension difference among the plurality of layers, and an absolute value of the tension difference between the compressive film and the tensile film is 400 [N/m] or smaller.Type: ApplicationFiled: April 15, 2020Publication date: October 22, 2020Inventors: Masanori MIKOSHIBA, Shiro YAZAKI, Toshinao SHINBO, Hitoshi TAKAAI
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Publication number: 20200198351Abstract: A liquid ejecting head including a diaphragm constituting a portion of a wall surface of a pressure chamber that accommodates a liquid, and a piezoelectric element that vibrates the diaphragm. In the liquid ejecting head, the diaphragm includes a plurality of layers, and d/D?0.25 is satisfied where D is a thickness of the diaphragm and d is a distance between a neutral axis of the diaphragm and an interface between two adjacent layers in which a tension difference is the largest in the plurality of layers.Type: ApplicationFiled: December 17, 2019Publication date: June 25, 2020Inventors: Masanori MIKOSHIBA, Shiro YAZAKI, Toshinao SHINBO, Hitoshi TAKAAI
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Publication number: 20200094553Abstract: A liquid ejecting head including a plurality of pressure chambers in communication with nozzles that eject a liquid, a diaphragm that includes layers including a first layer and a second layer and that constitutes wall surfaces of the plurality of pressure chambers, a plurality of piezoelectric elements formed on a first region of the diaphragm, the piezoelectric elements each being formed to correspond to a corresponding one of the pressure chambers, and a barrier layer that is in contact with an interface between the first layer and the second layer in a second region of the diaphragm, the second region surrounding the first region.Type: ApplicationFiled: September 18, 2019Publication date: March 26, 2020Inventors: Takanori AIMONO, Masao NAKAYAMA, Motoki TAKABE, Hitoshi TAKAAI