Patents by Inventor Hirokazu Nakamura
Hirokazu Nakamura 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: 20240106322Abstract: In a power conversion system, a control circuit has, as its operation modes: a first control mode in which control circuit controls a DC-DC converter at a first drive frequency; a second control mode in which control circuit controls DC-DC converter at a second drive frequency higher than first drive frequency; and a third control mode in which control circuit controls DC-DC converter at a third drive frequency higher than first drive frequency. Control circuit is configured to change operation mode from first control mode into second control mode when detector circuit detects a predetermined change in output voltage while control circuit is operating in first control mode. Control circuit controls DC-DC converter in third control mode in a process of changing, in response to detection of predetermined change, operation mode from first control mode into second control mode before starting to control DC-DC converter in second control mode.Type: ApplicationFiled: January 22, 2022Publication date: March 28, 2024Inventors: Hirokazu NAKAMURA, Kohei TSUKAMOTO, Kenichi ASANUMA, Ryoji MATSUI
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Patent number: 11608612Abstract: A hydraulic unit includes a hydraulic circuit fluidly connected to a hydraulic actuator, and a control device to control the hydraulic circuit. The hydraulic circuit includes a hydraulic oil tank, a hydraulic pump that supplies the hydraulic oil to the hydraulic actuator from the hydraulic oil tank, a discharge flow path fluidly connecting a discharge side of the hydraulic pump to the hydraulic actuator, a valve that blocks a flow of the hydraulic oil in the discharge flow path, and a pressure sensor that detects a pressure of the hydraulic oil the discharge flow path. In a pressure holding state, when a rotational frequency of the hydraulic pump exceeds a predetermined first determination rotational frequency or when a discharge flow rate of the hydraulic pump exceeds a predetermined first determination discharge flow rate, the control device determines that the hydraulic circuit is abnormal.Type: GrantFiled: September 2, 2020Date of Patent: March 21, 2023Assignee: Daikin Industries, Ltd.Inventors: Hirokazu Nakamura, Atsuhiro Kanbayashi, Hitoshi Segawa
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Publication number: 20220333349Abstract: A hydraulic unit includes a hydraulic circuit fluidly connected to a hydraulic actuator, and a control device to control the hydraulic circuit. The hydraulic circuit includes a hydraulic oil tank, a hydraulic pump that supplies the hydraulic oil to the hydraulic actuator from the hydraulic oil tank, a discharge flow path fluidly connecting a discharge side of the hydraulic pump to the hydraulic actuator, a valve that blocks a flow of the hydraulic oil in the discharge flow path, and a pressure sensor that detects a pressure of the hydraulic oil the discharge flow path. In a pressure holding state, when a rotational frequency of the hydraulic pump exceeds a predetermined first determination rotational frequency or when a discharge flow rate of the hydraulic pump exceeds a predetermined first determination discharge flow rate, the control device determines that the hydraulic circuit is abnormal.Type: ApplicationFiled: September 2, 2020Publication date: October 20, 2022Inventors: Hirokazu NAKAMURA, Atsuhiro KANBAYASHI, Hitoshi SEGAWA
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Publication number: 20220228983Abstract: A liquid sensor includes a light receiver configured to receive light. The light receiver is attachable to an outside of an accommodation unit into which a liquid is introduced and which has translucency. The light receiver receives light that has passed through the liquid in the accommodation unit or light reflected by the liquid, and outputs a signal related to a physical quantity of the liquid.Type: ApplicationFiled: May 14, 2020Publication date: July 21, 2022Inventors: Hikaru SEIKE, Hirokazu NAKAMURA, Mineo INOUE, Kenji AYADO
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Publication number: 20220146412Abstract: A liquid deterioration determination device includes a light receiver and a determination unit. The light receiver receives detection light transmitted through a liquid or detection light reflected by the liquid. The determination unit determines a degree of deterioration of the liquid. The light receiver outputs first and second detection values. The first detection value represents an amount of a light component of a first color included in the detection light transmitted through the liquid or the detection light reflected by the liquid. The second detection value represents an amount of a light component of a second color included in the detection light transmitted through the liquid or the detection light reflected by the liquid. The second color is different from the first color. The determination unit determines the degree of deterioration of the liquid based on a ratio of the second detection value to the first detection value.Type: ApplicationFiled: January 28, 2022Publication date: May 12, 2022Inventors: Hikaru SEIKE, Hirokazu NAKAMURA, Mineo INOUE, Kenji AYADO
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Patent number: 10509363Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: GrantFiled: March 12, 2019Date of Patent: December 17, 2019Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Kimihide Tsukamoto, Masaki Amemiya
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Publication number: 20190212696Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: ApplicationFiled: March 12, 2019Publication date: July 11, 2019Inventors: Hirokazu NAKAMURA, Kimihide TSUKAMOTO, Masaki AMEMIYA
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Patent number: 10268159Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: GrantFiled: February 6, 2018Date of Patent: April 23, 2019Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Kimihide Tsukamoto, Masaki Amemiya
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Publication number: 20180164742Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: ApplicationFiled: February 6, 2018Publication date: June 14, 2018Inventors: Hirokazu NAKAMURA, Kimihide TSUKAMOTO, Masaki AMEMIYA
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Patent number: 9910408Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: GrantFiled: November 3, 2016Date of Patent: March 6, 2018Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Kimihide Tsukamoto, Masaki Amemiya
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Publication number: 20170075302Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: ApplicationFiled: November 3, 2016Publication date: March 16, 2017Inventors: Hirokazu NAKAMURA, Kimihide TSUKAMOTO, Masaki AMEMIYA
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Patent number: 9519267Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: GrantFiled: March 2, 2016Date of Patent: December 13, 2016Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Kimihide Tsukamoto, Masaki Amemiya
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Publication number: 20160179054Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: ApplicationFiled: March 2, 2016Publication date: June 23, 2016Inventors: Hirokazu NAKAMURA, Kimihide TSUKAMOTO, Masaki AMEMIYA
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Patent number: 9326680Abstract: An ophthalmic apparatus includes: a main unit including a unit for observing or photographing an examinee's eye; a movable part in which the main unit is mounted; a vertical movement mechanism provided with a drive part to move the movable part up and down; an operating member to be operated by an examiner to move the movable part up and down; a sensing part to detect an operation signal of the operating member; and a driving control part to convert the operation signal detected by the sensing part to a drive signal to move the movable part up and down, and drive the drive part based on the drive signal, wherein the drive part includes a motor having a hollow portion about a rotation axis thereof, the motor being controlled by the driving control part to rotate.Type: GrantFiled: June 19, 2013Date of Patent: May 3, 2016Assignee: NIDEK CO., LTD.Inventors: Kenichiro Makino, Hirokazu Nakamura, Daisuke Baba, Toshiya Kobayashi
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Patent number: 9317010Abstract: Disclosed is an image forming apparatus including: a printing paper transport path in which printing paper is transported; a secondary transfer unit and a fixing section both disposed on the printing paper transport path; an open/close cover that, when opened, exposes the printing paper transport path in a main body of the apparatus; a pressure roller, disposed in the fixing section, that presses the printing paper on a side thereof facing the open/close cover against the printing paper transport path; and cooling fans that cool down the pressure roller, wherein the secondary transfer unit and the cooling fans are attached to the open/close cover and disposed at such positions that the secondary transfer unit and the cooling fans move following overlapping paths when the open/close cover is opened/closed.Type: GrantFiled: March 13, 2013Date of Patent: April 19, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Hirokazu Nakamura, Kimihide Tsukamoto, Masaki Amemiya
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Patent number: 9207592Abstract: A fixing device in accordance with the present invention comprises: a rotary member for transporting printing paper; a pressure member for press-contacting the rotary member to apply pressure onto the printing paper; and a cleaning member capable of freely moving into contact with, or away from, a peripheral surface of the rotary member and/or a peripheral surface of the pressure member. A toner image formed on the printing paper is fixed while the printing paper is being held between the rotary member and the pressure member. The fixing device further comprises a contact and separation unit for moving the pressure member into contact with, or away from, the rotary member. The cleaning member moves into contact with, or away from, the peripheral surface of the rotary member and/or the peripheral surface of the pressure member in conjunction with the contact and separation unit moving the pressure member into contact with, or away from, the rotary member.Type: GrantFiled: December 27, 2013Date of Patent: December 8, 2015Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Kousuke Namisaki, Motoki Ohta
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Patent number: 9164434Abstract: A fixing apparatus of the present invention includes a fixing rotation member, a rotation drive portion that rotates the fixing rotation member, a cleaning web sheet that cleans a circumferential surface of the fixing rotation member, a cleaning web sheet roller that takes up or feeds out the cleaning web sheet, a swing cam rotationally driven by the rotation drive portion, a rotation transmission portion that transmits a rotation drive force to the cleaning web sheet roller, a one way clutch provided on an input shaft of the rotation transmission portion, and a swing lever connected to the one way clutch and biased so as to be brought into slide contact with the swing cam.Type: GrantFiled: December 9, 2014Date of Patent: October 20, 2015Assignee: SHARP KABUSHIKI KAISHAInventors: Hirokazu Nakamura, Masatsugu Ohishi, Noriko Inoue, Masaki Amemiya, Masaya Asakawa, Takashi Yamanaka
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Patent number: 9152100Abstract: An image forming apparatus includes a pre-fixing sheet guide and a toner collection device. The pre-fixing sheet guide is to let a sheet conveyed along it, the sheet with a toner image transferred thereon at a transfer portion to an end part of the sheet. The sheet guide has a width shorter than a maximum printable sheet width. The toner collection device includes an adsorption member (pressure roller) that is disposed in the vicinity of the pre-fixing sheet guide and having a surface exhibiting conductivity, and a potential difference formation mechanism (earth mechanism) configured to form a potential difference between the surface of the adsorption member and the toner.Type: GrantFiled: May 29, 2014Date of Patent: October 6, 2015Assignee: SHARP KABUSHIKI KAISHAInventors: Hirokazu Nakamura, Kousuke Namisaki, Motoki Ohta
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Patent number: 9075382Abstract: An image forming apparatus includes a pre-fusing paper sheet guide, a fuser unit and a control section. The pre-fusing paper sheet guide is disposed adjacent to the fuser unit on its upstream side. The fuser unit includes a pressing roller having, an electrically conductive surface, a grounding structure grounding a pressing roller's surface, and a cleaning mechanism cleaning the pressing roller's surface. The cleaning mechanism includes a web and a take-up roller. The control section sets a winding quantity x of the web to 0.7 mm when a setting for printing without margin is not made, and sets the winding quantity x to 2.1 mm when the setting for printing without margin is made. If the number of sheets accumulated through the image forming process becomes not less than 18, the control section causes the take-up roller to wind the web by the winding quantity x, and performs an image forming process.Type: GrantFiled: June 11, 2014Date of Patent: July 7, 2015Assignee: Sharp Kabushiki KaishaInventors: Hirokazu Nakamura, Tatsuya Shinkawa, Kousuke Namisaki, Motoki Ohta
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Publication number: 20150093135Abstract: A fixing apparatus of the present invention includes a fixing rotation member, a rotation drive portion that rotates the fixing rotation member, a cleaning web sheet that cleans a circumferential surface of the fixing rotation member, a cleaning web sheet roller that takes up or feeds out the cleaning web sheet, a swing cam rotationally driven by the rotation drive portion, a rotation transmission portion that transmits a rotation drive force to the cleaning web sheet roller, a one way clutch provided on an input shaft of the rotation transmission portion, and a swing lever connected to the one way clutch and biased so as to be brought into slide contact with the swing cam.Type: ApplicationFiled: December 9, 2014Publication date: April 2, 2015Applicant: SHARP KABUSHIKI KAISHAInventors: Hirokazu NAKAMURA, Masatsugu OHISHI, Noriko INOUE, Masaki AMEMIYA, Masaya ASAKAWA, Takashi YAMANAKA