Patents by Inventor Kazunobu Kojima
Kazunobu Kojima 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).
-
Publication number: 20230392280Abstract: An object of the present invention is to provide a GaN crystal long in light emission lifetime by time-resolved photoluminescence measurement and provide high-quality GaN crystal and GaN substrate that have few specified crystal defects affecting the light emission lifetime. A gallium nitride crystal having a light emission lifetime by time-resolved photoluminescence measurement, of 5 ps or more and 200 ps or less, and satisfying at least one of the following requirement (i) and requirement (ii): (i) an FWHM in a 004 diffraction X-ray rocking curve is 50 arcsec or less at least one position of the crystal; and (ii) a dislocation density is 5×106 cm?2 or less.Type: ApplicationFiled: August 24, 2023Publication date: December 7, 2023Applicants: MITSUBISHI CHEMICAL CORPORATION, THE JAPAN STEEL WORKS, LTD., TOHOKU UNIVERSITYInventors: Yutaka MIKAWA, Hirotaka IKEDA, Quanxi BAO, Kouhei KURIMOTO, Kohei SHIMA, Kazunobu KOJIMA, Toru ISHIGURO, Shigefusa CHICHIBU
-
Patent number: 11245113Abstract: A secondary battery includes: a first oxide semiconductor having a first conductivity type; a first charging layer disposed on the first oxide semiconductor layer, and composed by including a first insulating material and a second oxide semiconductor having the first conductivity type; a second charging layer disposed on the first charging layer; a third oxide semiconductor layer having a second conductivity type disposed on the second charging layer; and a hydroxide layer disposed between the first charging layer and the third oxide semiconductor layer, and containing a hydroxide of a metal constituting the third oxide semiconductor layer. The highly reliable secondary battery is capable of improving an energy density and increasing battery characteristics (electricity accumulation capacity).Type: GrantFiled: February 26, 2019Date of Patent: February 8, 2022Assignee: Kabushiki Kaisha Nihon MicronicsInventors: Takashi Tonokawa, Yutaka Kosaka, Kazuyuki Tsunokuni, Hikaru Takano, Shigefusa Chichibu, Kazunobu Kojima
-
Patent number: 11217726Abstract: To improve a wall plug efficiency in a nitride semiconductor light-emitting element for extracting ultraviolet light emitted from an active layer toward an n-type nitride semiconductor layer side to outside of the element.Type: GrantFiled: February 14, 2018Date of Patent: January 4, 2022Assignee: SOKO KAGAKU CO., LTD.Inventors: Akira Hirano, Yosuke Nagasawa, Shigefusa Chichibu, Kazunobu Kojima
-
Publication number: 20210043804Abstract: To improve a wall plug efficiency in a nitride semiconductor light-emitting element for extracting ultraviolet light emitted from an active layer toward an n-type nitride semiconductor layer side to outside of the element.Type: ApplicationFiled: February 14, 2018Publication date: February 11, 2021Applicant: Soko Kagaku Co., Ltd.Inventors: Akira HIRANO, Yosuke NAGASAWA, Shigefusa CHICHIBU, Kazunobu KOJIMA
-
Patent number: 10643849Abstract: A manufacturing method of a nitride semiconductor ultraviolet light-emitting element having a peak emission wavelength of 285 nm or shorter comprises a first step of forming an n-type semiconductor layer composed of an n-type AlXGa1-XN-based semiconductor (1?X?0.5) on an upper surface of an underlying portion including a sapphire substrate, a second step of forming, above the n-type semiconductor layer, an active layer that includes a light-emitting layer composed of an AlYGa1-YN-based semiconductor (X>Y>0) and that is composed of an AlGaN-based semiconductor as a whole, and a third step of forming a p-type semiconductor layer composed of a p-type AlZGa1-ZN-based semiconductor (1?Z>Y) above the active layer. In the manufacturing method, a growth temperature at the second step is higher than 1200° C. and equal to or higher than a growth temperature at the first step.Type: GrantFiled: November 8, 2017Date of Patent: May 5, 2020Assignee: SOKO KAGAKU CO., LTD.Inventors: Akira Hirano, Yosuke Nagasawa, Shigefusa Chichibu, Kazunobu Kojima
-
Publication number: 20190228972Abstract: A manufacturing method of a nitride semiconductor ultraviolet light-emitting element having a peak emission wavelength of 285 nm or shorter comprises a first step of forming an n-type semiconductor layer composed of an n-type AlXGa1-XN-based semiconductor (1?X?0.5) on an upper surface of an underlying portion including a sapphire substrate, a second step of forming, above the n-type semiconductor layer, an active layer that includes a light-emitting layer composed of an AlYGa1-YN-based semiconductor (X>Y>0) and that is composed of an AlGaN-based semiconductor as a whole, and a third step of forming a p-type semiconductor layer composed of a p-type AlZGa1-ZN-based semiconductor (1?Z>Y) above the active layer. In the manufacturing method, a growth temperature at the second step is higher than 1200° C. and equal to or higher than a growth temperature at the first step.Type: ApplicationFiled: November 8, 2017Publication date: July 25, 2019Applicant: Soko Kagaku Co., Ltd.Inventors: Akira HIRANO, Yosuke NAGASAWA, Shigefusa CHICHIBU, Kazunobu KOJIMA
-
Publication number: 20190190024Abstract: A secondary battery includes: a first oxide semiconductor having a first conductivity type; a first charging layer disposed on the first oxide semiconductor layer, and composed by including a first insulating material and a second oxide semiconductor having the first conductivity type; a second charging layer disposed on the first charging layer; a third oxide semiconductor layer having a second conductivity type disposed on the second charging layer; and a hydroxide layer disposed between the first charging layer and the third oxide semiconductor layer, and containing a hydroxide of a metal constituting the third oxide semiconductor layer. The highly reliable secondary battery is capable of improving an energy density and increasing battery characteristics (electricity accumulation capacity).Type: ApplicationFiled: February 26, 2019Publication date: June 20, 2019Inventors: Takashi TONOKAWA, Yutaka KOSAKA, Kazuyuki TSUNOKUNI, Hikaru TAKANO, Shigefusa CHICHIBU, Kazunobu KOJIMA
-
Patent number: 7408963Abstract: A medical laser apparatus suitable for medical treatment, which is capable of obtaining a plurality of visible laser beams each having a different wavelength, but which has an inexpensive structure.Type: GrantFiled: September 27, 2006Date of Patent: August 5, 2008Assignee: Nidek Co., Ltd.Inventors: Kenichi Hayashi, Kazunobu Kojima
-
Patent number: 7262552Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, wherein at least one of the substrates is transparent. The substrates are placed opposite to each other to form a discharge space in between, and electrodes are provided to the substrate. The plasma display apparatus also includes a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying, and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: GrantFiled: March 1, 2006Date of Patent: August 28, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Patent number: 7250725Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, wherein at least one of the substrates is transparent. The substrates are placed opposite to each other to form a discharge space in between, and electrodes are provided to the substrate. The plasma display apparatus also includes a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying, and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: GrantFiled: March 1, 2006Date of Patent: July 31, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Publication number: 20070078449Abstract: A medical laser apparatus suitable for medical treatment, which is capable of obtaining a plurality of visible laser beams each having a different wavelength, but which has an inexpensive structure.Type: ApplicationFiled: September 27, 2006Publication date: April 5, 2007Applicant: NIDEK CO., LTD.Inventors: Kenichi Hayashi, Kazunobu Kojima
-
Patent number: 7091665Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, wherein at least one of the substrates is transparent. The substrates are placed opposite to each other to form a discharge space in between, and electrodes are provided to the substrate. The plasma display apparatus also includes a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying, and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: GrantFiled: June 12, 2002Date of Patent: August 15, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Publication number: 20060152909Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, wherein at least one of the substrates is transparent. The substrates are placed opposite to each other to form a discharge space in between, and electrodes are provided to the substrate. The plasma display apparatus also includes a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying, and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: ApplicationFiled: March 1, 2006Publication date: July 13, 2006Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Publication number: 20060145615Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, wherein at least one of the substrates is transparent. The substrates are placed opposite to each other to form a discharge space in between, and electrodes are provided to the substrate. The plasma display apparatus also includes a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying, and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: ApplicationFiled: March 1, 2006Publication date: July 6, 2006Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Patent number: 6813159Abstract: In a display device, attached to a plate-type chassis (2) is a PDP (1) having a display screen on which videos are displayed and a circuit board (9) on which a circuit driving the PDP (1) is arranged. The circuit board (9) is shielded with respect to the PDP (1) thanks to the chassis (2), and thus does not receive any unwanted radiation noise radiated by the PDP (1). The display device further includes a back cover (6) and a cabinet (7) each having conductivity. The back cover (6) and the cabinet (7) house therein the PDP (1) and the circuit board (9) attached to the chassis (2). The back cover (6) and the cabinet (7) are both electrically insulated from the chassis (2). Therefore, any unwanted radiation noise from the PDP (1) and the circuit on the circuit board (9) is stopped leaking to the outside.Type: GrantFiled: March 13, 2003Date of Patent: November 2, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shoichi Irie, Kazunobu Kojima
-
Publication number: 20040027073Abstract: A plasma display apparatus is equipped with a signal input terminal responsive to a user's application. The plasma display apparatus includes a panel including a pair of substrates, at least one of the substrates is transparent, placed oppositely to each other to form a discharge space in between, and electrodes being provided to the substrates; a display driving circuit block, disposed on a chassis and equipped with at least one signal inputting connector which applies a signal to the panel to perform displaying; and an input signal circuit block detachable to the signal inputting connector of the display driving circuit block.Type: ApplicationFiled: June 2, 2003Publication date: February 12, 2004Inventors: Tomihide Nomoto, Kazunobu Kojima, Akira Mizuno
-
Patent number: 6679876Abstract: The present invention is intended to provide a corneal surgery apparatus which enables a surgical operator to accurately ablate a cornea in part. The corneal surgery apparatus for ablating part of a cornea by irradiating a laser beam onto the cornea of a patient's eye comprises an irradiation optical system for irradiating the laser beam emitted from a laser light source onto the cornea, an aperture, which is disposed in the irradiation optical system, profiling a cross-sectional region of the beam perpendicular to an optical axis of the irradiation into one or more small regions, and correcting device for correcting an intensity distribution of the laser beam, which is changed when the beam passes through the aperture, to a specified intensity distribution.Type: GrantFiled: October 22, 2001Date of Patent: January 20, 2004Assignee: Nidek Co., Ltd.Inventors: Naoyuki Kondo, Kazunobu Kojima, Satoshi Imaizumi
-
Patent number: 6650676Abstract: A gas laser apparatus includes a chamber in which laser medium gas is sealingly filled; a pair of main discharge electrodes arranged opposite to each other in the chamber; and a fan disposed in the chamber; wherein the chamber has an inner wall of a substantially elliptic shape in a plane perpendicular to a lengthwise direction of the chamber, and a part of the inner wall being between the fan and the main discharge electrodes serves as a guide for guiding the gas made to flow by the fan toward the main discharge electrodes.Type: GrantFiled: July 2, 2001Date of Patent: November 18, 2003Assignee: Nidek Co., Ltd.Inventor: Kazunobu Kojima
-
Publication number: 20030169573Abstract: In a display device, attached to a plate-type chassis (2) is a PDP (1) having a display screen on which videos are displayed and a circuit board (9) on which a circuit driving the PDP (1) is arranged. The circuit board (9) is shielded with respect to the PDP (1) thanks to the chassis (2), and thus does not receive any unwanted radiation noise radiated by the PDP (1). The display device further includes a back cover (6) and a cabinet (7) each having conductivity. The back cover (6) and the cabinet (7) house therein the PDP (1) and the circuit board (9) attached to the chassis (2). The back cover (6) and the cabinet (7) are both electrically insulated from the chassis (2). Therefore, any unwanted radiation noise from the PDP (1) and the circuit on the circuit board (9) is stopped leaking to the outside.Type: ApplicationFiled: March 13, 2003Publication date: September 11, 2003Inventors: Shoichi Irie, Kazunobu Kojima
-
Patent number: 6560124Abstract: In a display device, attached to a plate-type chassis (2) is a PDP (1) having a display screen on which videos are displayed and a circuit board (9) on which a circuit driving the PDP (1) is arranged. The circuit board (9) is shielded with respect to the PDP (1) thanks to the chassis (2), and thus does not receive any unwanted radiation noise radiated by the PDP (1). The display device further includes a back cover (6) and a cabinet (7) each having conductivity. The back cover (6) and the cabinet (7) house therein the PDP (1) and the circuit board (9) attached to the chassis (2). The back cover (6) and the cabinet (7) are both electrically insulated from the chassis (2). Therefore, any unwanted radiation noise from the PDP (1) and the circuit on the circuit board (9) is stopped leaking to the outside.Type: GrantFiled: April 30, 2001Date of Patent: May 6, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shoichi Irie, Kazunobu Kojima