Patents by Inventor Takafumi Kiyono
Takafumi Kiyono 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: 10911010Abstract: A class-D amplifier according to an embodiment includes a PWM modulator, a first output transistor group that includes two transistors complementarily operating and includes a first connection point between the two transistors as an output terminal, a second output transistor group that includes two transistors complementarily operating and includes a second connection point between the two output transistors as an output terminal, and a selector configured to selectively provide a PWM pulse signal to one of the first output transistor group and the second output transistor group. A system that includes the second output transistor group, a low-pass filter, and a load connected to the low-pass filter configures a series resonance circuit.Type: GrantFiled: September 6, 2019Date of Patent: February 2, 2021Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Takafumi Kiyono
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Publication number: 20200304081Abstract: A class-D amplifier according to an embodiment includes a PWM modulator, a first output transistor group that includes two transistors complementarily operating and includes a first connection point between the two transistors as an output terminal, a second output transistor group that includes two transistors complementarily operating and includes a second connection point between the two output transistors as an output terminal, and a selector configured to selectively provide a PWM pulse signal to one of the first output transistor group and the second output transistor group. A system that includes the second output transistor group, a low-pass filter, and a load connected to the low-pass filter configures a series resonance circuit.Type: ApplicationFiled: September 6, 2019Publication date: September 24, 2020Inventor: Takafumi Kiyono
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Patent number: 10340910Abstract: A drive circuit includes a first level shift circuit, a second level shift circuit, a pre-driver, and a high-side transistor. The first level shift circuit outputs a first switch signal. The second level shift circuit outputs a second switch signal. The pre-driver includes a first switch portion configured to perform switching in accordance with the first switch signal and a second switch portion configured to output a gate signal in accordance with the second switch signal. The high-side transistor outputs a high-side output signal to an output terminal with a second power supply voltage which is fed in accordance with the gate signal.Type: GrantFiled: March 16, 2018Date of Patent: July 2, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Takayuki Takida, Ryota Miwa, Takafumi Kiyono
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Patent number: 10298188Abstract: A class-D amplifier of an embodiment includes: a PWM modulator configured to output a PWM pulse based on an input signal; a first output transistor group, in which a connection point of complementarily operated two first output transistors is an output end; a second output transistor group, in which a connection point of complementarily operated two second output transistors is connected to the connection point of the first transistors; a driver circuit capable of driving the first output transistors and the second output transistors of the first and second output transistor groups, based on the PWM pulse from the PWM modulator; and a control circuit configured to generate a control signal for operating at least one of the first output transistor group and the second output transistor group.Type: GrantFiled: August 31, 2017Date of Patent: May 21, 2019Assignee: Kabushiki Kaisha ToshibaInventor: Takafumi Kiyono
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Publication number: 20190089347Abstract: A drive circuit includes a first level shift circuit, a second level shift circuit, a pre-driver, and a high-side transistor. The first level shift circuit outputs a first switch signal. The second level shift circuit outputs a second switch signal. The pre-driver includes a first switch portion configured to perform switching in accordance with the first switch signal and a second switch portion configured to output a gate signal in accordance with the second switch signal. The high-side transistor outputs a high-side output signal to an output terminal with a second power supply voltage which is fed in accordance with the gate signal.Type: ApplicationFiled: March 16, 2018Publication date: March 21, 2019Inventors: Takayuki Takida, Ryota Miwa, Takafumi Kiyono
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Publication number: 20180241363Abstract: A class-D amplifier of an embodiment includes: a PWM modulator configured to output a PWM pulse based on an input signal; a first output transistor group, in which a connection point of complementarily operated two first output transistors is an output end; a second output transistor group, in which a connection point of complementarily operated two second output transistors is connected to the connection point of the first transistors; a driver circuit capable of driving the first output transistors and the second output transistors of the first and second output transistor groups, based on the PWM pulse from the PWM modulator; and a control circuit configured to generate a control signal for operating at least one of the first output transistor group and the second output transistor group.Type: ApplicationFiled: August 31, 2017Publication date: August 23, 2018Inventor: Takafumi Kiyono
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Patent number: 9089638Abstract: A medical needle device includes a hub having an injection needle fixed at a top end thereof, and a substantially cylindrical sheath which is fit on the hub and having a pair of wings mounted on both sides thereof. The pair of wings are bent along the both sides of the sheath, overlapped and held together at a time of puncturing so that an inner peripheral surface of the sheath strongly presses an outer peripheral surface of the hub, thereby preventing movement of the hub caused by transfer of the hub relative to the sheath both in a rotational direction and a longitudinal direction. sheath has a plurality of protrusions provided on the inner peripheral surface thereof in a circumferential direction, the protrusions being spaced out from each other; and the outer peripheral surface of the hub abuts the protrusions.Type: GrantFiled: September 18, 2007Date of Patent: July 28, 2015Assignee: JMS CO., LTD.Inventors: Takafumi Kiyono, Takayuki Ohno, Takahide Nakanishi, Toru Fukushima, Eiji Sanada
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Patent number: 7984739Abstract: It is intended to provide a method of producing thermally fused synthetic resin members for medical use which makes it possible that, in the case of thermally fusing synthetic resin members for medical use, for example, a relatively soft thermoplastic tube constituting an AVF needle with another part being harder than the tube such as a needle base (hub) of a wing needle, or a part provided with a fitting connector being harder than the tube (for example, a blood circuit, an extension tube, an infusion set or the like), the connecting parts of the thermoplastic tube member and the other member harder than the thermoplastic tube member can be quickly and uniformly thermal-fused and the production process can be automatically and continuously performed while keeping a high productivity; and a production apparatus therefor.Type: GrantFiled: July 26, 2005Date of Patent: July 26, 2011Assignee: JMS Co., Ltd.Inventors: Susumu Hongo, Takafumi Kiyono, Youzou Katsura, Yasuhiro Mitsumoto, Shingo Henmi
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Publication number: 20100049139Abstract: A medical needle device includes a hub having an injection needle fixed at a top end thereof, and a substantially cylindrical sheath which is fit on the hub and having a pair of wings mounted on both sides thereof. The pair of wings are bent along the both sides of the sheath, overlapped and held together at a time of puncturing so that an inner peripheral surface of the sheath strongly presses an outer peripheral surface of the hub, thereby preventing movement of the hub caused by transfer of the hub relative to the sheath both in a rotational direction and a longitudinal direction. sheath has a plurality of protrusions provided on the inner peripheral surface thereof in a circumferential direction, the protrusions being spaced out from each other; and the outer peripheral surface of the hub abuts the protrusions.Type: ApplicationFiled: September 18, 2007Publication date: February 25, 2010Inventors: Takafumi Kiyono, Takayuki Ohno, Takahide Nakanishi, Toru Fukushima, Eiji Sanada
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Publication number: 20090038756Abstract: It is intended to provide a method of producing thermally fused synthetic resin members for medical use which makes it possible that, in the case of thermally fusing synthetic resin members for medical use, for example, a relatively soft thermoplastic tube constituting an AVF needle with another part being harder than the tube such as a needle base (hub) of a wing needle, or a part provided with a fitting connector being harder than the tube (for example, a blood circuit, an extension tube, an infusion set or the like), the connecting parts of the thermoplastic tube member and the other member harder than the thermoplastic tube member can be quickly and uniformly thermal-fused and the production process can be automatically and continuously performed while keeping a high productivity; and a production apparatus therefor.Type: ApplicationFiled: July 26, 2005Publication date: February 12, 2009Inventors: Susumu Hongo, Takafumi Kiyono, Youzou Katsura, Yasuhiro Mitsumoto, Shingo Henmi
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Patent number: 7306576Abstract: In a medical needle device having a shield for reduction of needlestick injuries, a protrusion is formed on an outer peripheral surface of a hub to which a needle is mounted, a height of the protrusion being set so that the protrusion protrudes beyond an inner diameter of a shield tube, and a gate groove is formed at an inner surface of the shield tube to extend from a front end to the vicinity of a rear end, dimensions of the gate groove being such that the protrusion can fit in a front end portion of the gate groove. In a state where the protrusion is exposed from the front end of the shield tube, the hub can rotate with respect to the shield tube. At a rotational position of the protrusion at which it does not face a front end of the gate groove, a position of the hub is limited so as not to move toward a rear end side of the shield tube due to engagement of the protrusion with a front end face of the shield tube.Type: GrantFiled: July 4, 2003Date of Patent: December 11, 2007Assignee: JMS Co., Ltd.Inventors: Susumu Hongo, Takafumi Kiyono, Kuniharu Moriwaki
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Publication number: 20070088283Abstract: A medical syringe comprising a cylindrical connection supporting member increasing the holding force of a lure inserted into a connection target. The connection supporting member is formed to be slid along the lure or a syringe body part in a state of being movable between a first position near a tip of the lure and a second position away from a tip of the lure. The syringe is characterized in that, when the connection supporting member is moved to the second position, the tip of the lure is exposed.Type: ApplicationFiled: September 27, 2004Publication date: April 19, 2007Inventors: Susumu Hongo, Shigeaki Ishi, Takafumi Kiyono, Ken Kondo, Takahiko Kunishige, Masayuki Morimoto, Tadashi Okiyama, Raita Uematsu, Takehiko Yuki
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Publication number: 20060276750Abstract: The medical needle device includes a winged shield (4) that has a substantially cylindrical shield tube (4a) and a pair of wings (5, 6) positioned at a front end side of the shield tube, a hub (2) that is inserted into an inner bore of the shield tube so as to be movable in an axial direction, and a needle (1) that is mounted to a front end of the hub. An infusion tube (3) can be attached to a rear end of the hub, and a tip of the needle can be stored in the inner bore of the shield tube. The shield tube is bendable at least in a part along the axial direction when the needle protrudes from a front end of the shield tube and is latched to the shield tube. Thereby, the medical needle device is bendable in a curve in a position that is sufficiently close to the needle, while having the winged shield.Type: ApplicationFiled: March 22, 2004Publication date: December 7, 2006Applicant: JMS CO. LTD.Inventors: Kuniharu Moriwaki, Susumu Hongo, Takafumi Kiyono
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Publication number: 20040249351Abstract: In a medical needle device having a shield for reduction of needlestick injuries, a protrusion is formed on an outer peripheral surface of a hub to which a needle is mounted, a height of the protrusion being set so that the protrusion protrudes beyond an inner diameter of a shield tube, and a gate groove is formed at an inner surface of the shield tube to extend from a front end to the vicinity of a rear end, dimensions of the gate groove being such that the protrusion can fit in a front end portion of the gate groove. In a state where the protrusion is exposed from the front end of the shield tube, the hub can rotate with respect to the shield tube. At a rotational position of the protrusion at which it does not face a front end of the gate groove, a position of the hub is limited so as not to move toward a rear end side of the shield tube due to engagement of the protrusion with a front end face of the shield tube.Type: ApplicationFiled: March 10, 2004Publication date: December 9, 2004Inventors: Susumu Hongo, Takafumi Kiyono, Kuniharu Moriwaki