Patents by Inventor Akira Atsumi
Akira Atsumi 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: 7495223Abstract: A photomultiplier tube, a photomultiplier tube unit, and a performance-improved radiation detector for increasing a fixing area of a side tube in a faceplate while increasing an effective sensitive area of the faceplate. In the photomultiplier tube, a side face (3c) of the faceplate (3) protrudes outward from an outer side wall (2b) of a metal side tube (2), so that a light receiving area for receiving light passing through a light receiving face (3d) of the faceplate (3) is increased. The overhanging structure of the faceplate (3) is conceived based on a glass refractive index. The overhanging structure is aimed to receive light as much as possible which has not been received before. When the metal side tube (2) is fused to the glass faceplate (3), a fusing method is adopted due to joint between glass and metal. Joint operation between the faceplate (3) and the side tube (2) is reliably ensured. Accordingly, the overhanging structure of the faceplate (3) is effective.Type: GrantFiled: September 7, 2007Date of Patent: February 24, 2009Assignee: Hamamatsu Photonics K. K.Inventors: Hideki Shimoi, Akira Atsumi, Hiroyuki Kyushima
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Publication number: 20080001541Abstract: A photomultiplier tube, a photomultiplier tube unit, and a performance-improved radiation detector for increasing a fixing area of a side tube in a faceplate while increasing an effective sensitive area of the faceplate. In the photomultiplier tube, a side face (3c) of the faceplate (3) protrudes outward from an outer side wall (2b) of a metal side tube (2), so that a light receiving area for receiving light passing through a light receiving face (3d) of the faceplate (3) is increased. The overhanging structure of the faceplate (3) is conceived based on a glass refractive index. The overhanging structure is aimed to receive light as much as possible which has not been received before. When the metal side tube (2) is fused to the glass faceplate (3), a fusing method is adopted due to joint between glass and metal. Joint operation between the faceplate (3) and the side tube (2) is reliably ensured. Accordingly, the overhanging structure of the faceplate (3) is effective.Type: ApplicationFiled: September 7, 2007Publication date: January 3, 2008Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Hideki Shimoi, Akira Atsumi, Hiroyuki Kyushima
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Patent number: 7276704Abstract: A photomultiplier tube, a photomultiplier tube unit, and a performance-improved radiation detector for increasing a fixing area of a side tube in a faceplate while increasing an effective sensitive area of the faceplate. In the photomultiplier tube, a side face (3c) of the faceplate (3) protrudes outward from an outer side wall (2b) of a metal side tube (2), so that a light receiving area for receiving light passing through a light receiving face (3d) of the faceplate (3) is increased. The overhanging structure of the faceplate (3) is conceived based on a glass refractive index. The overhanging structure is aimed to receive light as much as possible which has not been received before. When the metal side tube (2) is fused to the glass faceplate (3), a fusing method is adopted due to joint between glass and metal. Joint operation between the faceplate (3) and the side tube (2) is reliably ensured. Accordingly, the overhanging structure of the faceplate (3) is effective.Type: GrantFiled: May 8, 2000Date of Patent: October 2, 2007Assignee: Hamamatsu Photonics K.K.Inventors: Hideki Shimoi, Akira Atsumi, Hiroyuki Kyushima
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Patent number: 7148461Abstract: A metal side tube (2), a glass faceplate (3), and a stem plate (4) constitute a hermetically sealed vessel (5) for a photomultiplier tube. An edge portion (20) is provided at on open end (A) of the side tube (2). The edge portion (2) is embedded in the faceplate (3) in such a manner as to strike on the faceplate (3). Accordingly, high hermeticity at a joint between the side tube (2) and the faceplate (3) is ensured. The edge portion (20) extends upright in an axial direction of the side tube (2), so that the edge portion (20) can be embedded as close to a side face (3c) of the faceplate (3) as possible. This structure increases an effective sensitive area of the faceplate (3) to nearly 100%, and decreases dead area as close to 0 as possible. As described above, the photomultiplier tube (1) according to the present invention has enlarged effective sensitive area of the side tube (3) and enhanced hermeticity of the joint between the faceplate (3) and the side tube (2).Type: GrantFiled: October 27, 2004Date of Patent: December 12, 2006Assignee: Hamamatsu Photonics K.K.Inventors: Hideki Shimoi, Hiroyuki Kyushima, Akira Atsumi
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Patent number: 7042155Abstract: A dynode constituting an electron multiplier or a photomultiplier may be provided with eight rows of channels each defined by an outer frame and a partitioning part of the dynode. In each channel, a plurality of electron multiplying holes may be arranged. In specified positions of the outer frame and the partitioning part of the dynode, glass receiving parts wider than the outer frame and the partitioning part may be provided integrally with the dynode. Glass parts may be bonded to all the glass receiving parts. The glass parts may be bonded by applying glass to the glass receiving parts and hardening the glass and each may have a generally dome-like convex shape. Each dynode may be formed after the dome-like glass part may be bonded to the glass receiving part.Type: GrantFiled: October 11, 2005Date of Patent: May 9, 2006Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Patent number: 6998778Abstract: A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).Type: GrantFiled: December 9, 2004Date of Patent: February 14, 2006Assignee: Hamamatsu Photonics, K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Publication number: 20060028134Abstract: A dynode constituting an electron multiplier or a photomultiplier may be provided with eight rows of channels each defined by an outer frame and a partitioning part of the dynode. In each channel, a plurality of electron multiplying holes may be arranged. In specified positions of the outer frame and the partitioning part of the dynode, glass receiving parts wider than the outer frame and the partitioning part may be provided integrally with the dynode. Glass parts may be bonded to all the glass receiving parts. The glass parts may be bonded by applying glass to the glass receiving parts and hardening the glass and each may have a generally dome-like convex shape. Each dynode may be formed after the dome-like glass part may be bonded to the glass receiving part.Type: ApplicationFiled: October 11, 2005Publication date: February 9, 2006Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Patent number: 6946641Abstract: A metal side tube (2), a glass faceplate (3), and a stem plate ( ) constitute a hermetically sealed vessel (5) for a photomultiplier tube. An edge portion (20) is provided at on open end (A) of the side tube (2). The edge portion (2) is embedded in the faceplate (3) in such a manner as to strike on the faceplate (3). Accordingly, high hermeticity at a joint between the side tube (2) and the faceplate (3) is ensured. The edge portion (20) extends upright in an axial direction of the side tube (2), so that the edge portion (20) can be embedded as close to a side face (3c) of the faceplate (3) as possible. This structure increases an effective sensitive area of the faceplate (3) to nearly 100%, and decreases dead area as close to 0 as possible. As described above, the photomultiplier tube (1) according to the present invention has enlarged effective sensitive area of the side tube (3) and enhanced hermeticity of the joint between the faceplate (3) and the side tube (2).Type: GrantFiled: May 8, 2000Date of Patent: September 20, 2005Assignee: Hamamatsu Photonics K.K.Inventors: Hideki Shimoi, Hiroyuki Kyushima, Akira Atsumi
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Publication number: 20050110379Abstract: A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).Type: ApplicationFiled: December 9, 2004Publication date: May 26, 2005Applicant: HAMAMATSU PHOTONICKS K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Publication number: 20050087676Abstract: A metal side tube (2), a glass faceplate (3), and a stem plate (4) constitute a hermetically sealed vessel (5) for a photomultiplier tube. An edge portion (20) is provided at on open end (A) of the side tube (2). The edge portion (2) is embedded in the faceplate (3) in such a manner as to strike on the faceplate (3). Accordingly, high hermeticity at a joint between the side tube (2) and the faceplate (3) is ensured. The edge portion (20) extends upright in an axial direction of the side tube (2), so that the edge portion (20) can be embedded as close to a side face (3c) of the faceplate (3) as possible. This structure increases an effective sensitive area of the faceplate (3) to nearly 100%, and decreases dead area as close to 0 as possible. As described above, the photomultiplier tube (1) according to the present invention has enlarged effective sensitive area of the side tube (3) and enhanced hermeticity of the joint between the faceplate (3) and the side tube (2).Type: ApplicationFiled: October 27, 2004Publication date: April 28, 2005Applicant: Hamamatsu Photonics K.K.Inventors: Hideki Shimoi, Hiroyuki Kyushima, Akira Atsumi
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Patent number: 6852979Abstract: A photomultiplier tube enhanced in simplicity and flexibility of mounting, a photomultiplier tube unit enhanced in photomultiplier tube assembling efficiency when unitized, and a radiation detector enhanced in assembling efficiency for a plurality of photomultiplier tubes. The photomultiplier tube (1) has a hermetically sealed vessel (5) easily screw-fixed in a predetermined position due to screwing means (30) provided in the stem plate (4). As a result, the photomultiplier tube (1) can be very easily attached or detached so that even an unskilled person can mount the photomultiplier tube (1) easily and accurately in a predetermined position by screwing.Type: GrantFiled: May 8, 2000Date of Patent: February 8, 2005Assignee: Hamamatsu Photonics K. K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Patent number: 6841935Abstract: A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).Type: GrantFiled: April 3, 2001Date of Patent: January 11, 2005Assignee: Hamamatsu Photonics, K. K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Patent number: 6762555Abstract: A photomultiplier tube has a side tube with a stem plate fixed on one end and a faceplate fixed on the other. The side tube is formed of metal, and at least the portion of the stem plate contacting the metal side tube is formed of metal. The side tube and stem plate are fused together by laser welding or electron beam welding to form an airtight vessel, such that the outer edge of the stem plate does not protrude further externally than the outer surface of the side tube.Type: GrantFiled: November 28, 2000Date of Patent: July 13, 2004Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi, Tomoyuki Okada, Masuo Ito
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Patent number: 6650049Abstract: To reduce the size of a photomultiplier tube (1), a side tube (2) is fixedly secured by welding to a stem plate (4) while an inner surface (2c) of the lower portion (2a) of the side tube (2) is maintained to be in contact with an outer edge (4b) of the stem plate (4). As a result, there is no projection like a flange at the lower portion of the photomultiplier tube (1). Therefore, though it is difficult to perform resistance welding, the outside dimensions of the photomultiplier tube (1) can be decreased, and the side tubes (9) can densely abut to one another even if the photomultiplier tubes (2) are arranged when applied. Hence, high-density arrangement of photomultiplier tubes (1) are realized by assembling metallic stem plate (4) and the side tube (2) by, for example, laser welding.Type: GrantFiled: November 28, 2000Date of Patent: November 18, 2003Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi, Tomoyuki Okada, Masuo Ito
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Publication number: 20030102802Abstract: A dynode (8) constituting an electron multiplier or a photomultiplier is provided with eight rows of channels (15) each defined by an outer frame (16) and a partitioning part (17) of the dynode (8). In each channel (15), a plurality of electron multiplying holes (14) are arranged. In specified positions of the outer frame (16) and the partitioning part (17) of the dynode (8), glass receiving parts (21) wider than the outer frame (16) and the partitioning part (17) are provided integrally with the dynode (8). Glass parts (22) are bonded to all the glass receiving parts (21). The glass parts (22) are bonded by applying glass to the glass receiving parts (21) and hardening the glass and each have a generally dome-like convex shape. Each dynode (8) is formed after the dome-like glass part (22) is bonded to the glass receiving part (21).Type: ApplicationFiled: October 3, 2002Publication date: June 5, 2003Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi
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Patent number: 6472664Abstract: A photomultiplier tube unit including photomultiplier tubes densely assembled and thereby having an improved light sensing efficiency. The outer surfaces (2b) of metal side tubes (2) of photomultiplier tubes (1) are in facial contact with one another, and thereby a high-density arrangement of photomultiplier tubes (1) are achieved. The side tubes (2) can be electrically connected to one another, and therefore the side tubes (2) can be easily made equipotential. As a result, it is unnecessary to electrically connect the stem pin (10) to the side tube (2) of each photomultiplier tube (1), facilitating the assembling of the photomultiplier tube unit. When a required photomultiplier tube (1) in a device (e.g., a gamma camera) having thus-united multiple photomultiplier tubes is replaced with a new one, the troublesome work of replacing photomultiplier tubes one by one is obviated, simplifying the replacement work.Type: GrantFiled: November 30, 2000Date of Patent: October 29, 2002Assignee: Hamamatsu-Photonics, Ltd.Inventors: Hiroyuki Kyushima, Akira Atsumi, Hideki Shimoi, Tomoyuki Okada, Masuo Ito
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Publication number: 20010028363Abstract: Provided is a file storing-and-managing method and device, for receiving, storing and managing electronic files over the Internet, the method and device including an effective and easy-to-operate GUI which can be operated visually and intuitionally without causing any stress. The file-managing device sends a graphical operation page to a user-computer connected over the Internet. The operation page includes a description (5) of the structure showing how the received-files are stored in the file-managing device and a description (7) of the structure showing how local files are stored in the user-computer, so that a user can easily upload and download files through graphical and intuitional operations of this page. Further, the file-managing device creates preview image data which is provided for previewing of the received-file and which has a data-size smaller than the original received-file. This preview image data is associated to and managed with the original received-file.Type: ApplicationFiled: December 19, 2000Publication date: October 11, 2001Applicant: Mitsubishi Corporation and Starnet Co., Ltd.Inventors: Junichi Nomoto, Ryuichi Noshiro, Akira Atsumi, Masataka Yamamoto, Kazuo Matsuda
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Patent number: 5801511Abstract: A photomultiplier of the present invention has an electron multiplier of a structure which can be manufactured easily. This electron multiplier is constituted by dynode plates that are stacked through insulators so as to be separated from each other at a predetermined interval. Each dynode plate comprises upper- and lower-electrode plates that are electrically connected to each other. The upper- and lower-electrode plates grip at least one of the insulators such that the gripped insulator is partly exposed.Type: GrantFiled: July 24, 1997Date of Patent: September 1, 1998Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Yutaka Hasegawa, Akira Atsumi, Koji Nagura
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Patent number: 5789861Abstract: A photomultiplier is constituted by a photocathode and an electron multiplier having a typical structure in which a dynode unit having a plurality of dynode plates stacked in an incident direction of photoelectrons, an anode plate, and an inverting dynode plate are sequentially stacked. Through holes for injecting a metal vapor are formed in the inverting dynode plate to form secondary electron emitting layers on the surfaces of dynodes supported by the dynode plates, and the photocathode. With this structure, the secondary electron emitting layers are uniformly formed on the surfaces of the dynodes. Therefore, variations in output signals obtained from anodes can be reduced regardless of the positions of the photocathode.Type: GrantFiled: December 12, 1996Date of Patent: August 4, 1998Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Koji Nagura, Yutaka Hasegawa, Eiichiro Kawano, Tomihiko Kuroyanagi, Akira Atsumi, Masuya Mizuide
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Patent number: 5619100Abstract: A photomultiplier is constituted by a photocathode and an electron multiplier having a typical structure in which a dynode unit having a plurality of dynode plates stacked in an incident direction of photoelectrons, an anode plate, and an inverting dynode plate are sequentially stacked. Through holes for injecting a metal vapor are formed in the inverting dynode plate to form secondary electron emitting layers on the surfaces of dynodes supported by the dynode plates, and the photocathode. With this structure, the secondary electron emitting layers are uniformly formed on the surfaces of the dynodes. Therefore, variations in output signals obtained from anodes can be reduced regardless of the positions of the photocathode.Type: GrantFiled: April 28, 1994Date of Patent: April 8, 1997Assignee: Hamamatsu Photonics K.K.Inventors: Hiroyuki Kyushima, Koji Nagura, Yutaka Hasegawa, Eiichiro Kawano, Tomihiko Kuroyanagi, Akira Atsumi, Masuya Mizuide