Patents by Inventor Masahiro Nakatsuka
Masahiro Nakatsuka 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: 8635886Abstract: It is an object of the present invention to provide a copper-containing silica glass which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength of 400 nm or less, and which is excellent in long term stability even in the high output use. The copper-containing silica glass is made to have copper of from 5 wtppm to 200 wtppm, which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength ranging from 160 nm to 400 nm, and in which an internal transmittance per 2.5 mm thickness at a wavelength of 530 nm is 95% or more.Type: GrantFiled: July 26, 2012Date of Patent: January 28, 2014Assignees: Shin-Etsu Quartz Products Co., Ltd., Opto-Electronics Laboratory, Inc.Inventors: Tetsuji Ueda, Michinari Ohuchi, Hiroyuki Nishimura, Akira Fujinoki, Masahiro Nakatsuka, Hidetsugu Yoshida
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Publication number: 20120291488Abstract: It is an object of the present invention to provide a copper-containing silica glass which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength of 400 nm or less, and which is excellent in long term stability even in the high output use. The copper-containing silica glass is made to have copper of from 5 wtppm to 200 wtppm, which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength ranging from 160 nm to 400 nm, and in which an internal transmittance per 2.5 mm thickness at a wavelength of 530 nm is 95% or more.Type: ApplicationFiled: July 26, 2012Publication date: November 22, 2012Applicants: OPTO-ELECTRONICS LABORATORY, INC., SHIN-ETSU QUARTZ PRODUCTS CO., LTD.Inventors: Tetsuji Ueda, Michinari Ohuchi, Hiroyuki Nishimura, Akira Fujinoki, Masahiro Nakatsuka, Hidetsugu Yoshida
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Publication number: 20100109509Abstract: It is an object of the present invention to provide a copper-containing silica glass which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength of 400 nm or less, and which is excellent in long term stability even in the high output use. The copper-containing silica glass is made to have copper of from 5 wtppm to 200 wtppm, which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength ranging from 160 nm to 400 nm, and in which an internal transmittance per 2.5 mm thickness at a wavelength of 530 nm is 95% or more.Type: ApplicationFiled: April 28, 2008Publication date: May 6, 2010Applicants: SHIN-ETSU QUARTZ PRODUCTS CO., LTD. (SQP), OPTO-ELECTRONICS LABORATORY, INC.Inventors: Tetsuji Ueda, Michinari Ohuchi, Hiroyuki Nishimura, Akira Fujinoki, Masahiro Nakatsuka, Hidetsugu Yoshida
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Patent number: 7531475Abstract: The present invention provides a glass composition that exhibits a fluorescence function and an optical amplification function in a wide wavelength range. This glass composition includes a bismuth oxide, a silicon oxide, an aluminum oxide, and a divalent metal oxide, and the glass composition emits fluorescence in an infrared wavelength region through irradiation of excitation light, with bismuth contained in the bismuth oxide functioning as a fluorescent source.Type: GrantFiled: June 22, 2005Date of Patent: May 12, 2009Assignees: Nippon Sheet Glass Company, LimitedInventors: Shoichi Kishimoto, Koichi Sakaguchi, Masahiro Tsuda, Shigeki Nakagaki, Shigekazu Yoshii, Yasushi Fujimoto, Masahiro Nakatsuka
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Patent number: 7521702Abstract: An object of the present invention is to provide an extreme ultraviolet light source target which can emits extreme ultraviolet light with high emission efficiency. A solid target made of heavy metal or heavy-metal compound and having a density 0.5 to 80% that of the crystal density is used. When the target is irradiated with a laser beam, plasma of the heavy metal contained in the target is generated, and extreme ultraviolet light having a predetermined wavelength which corresponds to the kind of the heavy metal is emitted from the plasma. When the density of the target is made to be smaller than the crystal density as described above, space distribution of the density of the generated plasma can be controlled, and the region in which plasma absorbs energy of the laser beam overlaps the region in which the plasma emits the extreme ultraviolet light. Thus, emission efficiency can be improved, preventing energy loss.Type: GrantFiled: December 26, 2003Date of Patent: April 21, 2009Assignee: Osaka UniversityInventors: Keiji Nagai, Hiroaki Nishimura, Takayoshi Norimatsu, Katsunobu Nishihara, Noriaki Miyanaga, Masahiro Nakatsuka, Yasukazu Izawa, Tatsuhiko Yamanaka, Mitsuo Nakai, Keisuke Shigemori, Masakatsu Murakami, Yoshinori Shimada, Shigeaki Uchida, Hiroyuki Furukawa, Atsushi Sunahara, Vasilli Zhakhovski, Ryouji Matsui, Takahiro Hibino, Tomoharu Okuno
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Publication number: 20090009855Abstract: There is provided a wide-band optical amplifying device capable of performing amplification over a wideband in infrared range. The wideband optical amplifier is characterized in that optical amplification is realized by optically exciting a glass or a crystal having bismuth as fluorescent center and that the amplification wavelength is 1000 nm to 1600 nm.Type: ApplicationFiled: February 28, 2006Publication date: January 8, 2009Inventors: Masahiro Nakatsuka, Yasushi Fujimoto, Young-Seok Seo
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Publication number: 20080068703Abstract: The present invention provides a novel glass composition in which fluorescence derived from bismuth (Bi) is obtained and whose meltability is improved. The glass composition of the present invention includes bismuth oxide, Al2O3 and SiO2. SiO2 is a main component of glass network forming oxide included in the glass composition. The glass composition further includes at least one oxide selected from TiO2, GeO2, P2O5 and B2O3. A total content of SiO2, the at least one oxide, Y2O3 and lanthanide oxide is over 80 mol %. Bismuth included in the bismuth oxide functions as a luminous species. Upon irradiation of excitation light, the glass composition emits fluorescence in the infrared wavelength range.Type: ApplicationFiled: February 23, 2006Publication date: March 20, 2008Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Masahiro Nakatsuka, Yasushi Fujimoto, Young-Seok Seo, Koichi Sakaguchi, Shoichi Kishimoto
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Publication number: 20060133574Abstract: An object of the present invention is to provide an extreme ultraviolet light source target which can emits extreme ultraviolet light with high emission efficiency. A solid target made of heavy metal or heavy-metal compound and having a density 0.5 to 80% that of the crystal density is used. When the target is irradiated with a laser beam, plasma of the heavy metal contained in the target is generated, and extreme ultraviolet light having a predetermined wavelength which corresponds to the kind of the heavy metal is emitted from the plasma. When the density of the target is made to be smaller than the crystal density as described above, space distribution of the density of the generated plasma can be controlled, and the region in which plasma absorbs energy of the laser beam overlaps the region in which the plasma emits the extreme ultraviolet light. Thus, emission efficiency can be improved, preventing energy loss.Type: ApplicationFiled: December 26, 2003Publication date: June 22, 2006Applicant: KANSAI TECHNOLOGY LICENSING ORGANIZATION CO., LTD.Inventors: Keiji Nagai, Hiroaki Nishimura, Takayoshi Norimatsu, Katsunobu Nishihara, Noriaki Miyanaga, Masahiro Nakatsuka, Yasukazu Izawa, Tatsuhiko Yamanaka, Mitsuo Nakai, Keisuke Shigemori, Masakatsu Murakami, Yoshinori Shimada, Shigeaki Uchida, Atsushi Sunahara, Vasilli Zhakhovski, Ryouji Matsui, Takahiro Hibino, Tomoharu Okuno
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Publication number: 20060001005Abstract: The present invention provides a glass composition that exhibits a fluorescence function and an optical amplification function in a wide wavelength range. This glass composition includes a bismuth oxide, a silicon oxide, an aluminum oxide, and a divalent metal oxide, and the glass composition emits fluorescence in an infrared wavelength region through irradiation of excitation light, with bismuth contained in the bismuth oxide functioning as a fluorescent source.Type: ApplicationFiled: June 22, 2005Publication date: January 5, 2006Applicants: NIPPON SHEET GLASS COMPANY, LIMITED, YASUSHI FUJIMOTO, MASAHIRO NAKATSUKAInventors: Shoichi Kishimoto, Koichi Sakaguchi, Masahiro Tsuda, Shigeki Nakagaki, Shigekazu Yoshii, Yasushi Fujimoto, Masahiro Nakatsuka
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Patent number: 5729344Abstract: The invention counterbalances the defects of optical glass and optical plastic so as to realize a high precision aspherical processing. The optical lens 1 includes a matrix 2 of optical glass and a coating of optical resin material applied to the surface of the matrix 2. A reflective wavefront of a lens plane 4 of the optical lens 1 is measured by means of a interferometer 5. The wavefront from the interferometer 5 is monitored by a computer system 7 to provide monitoring information. The lens plane 4 is irradiated or scanned with a short wavelength, ultraviolet laser beam L in accordance with the monitoring information, whereby the lens plane 4 is processed with the ultraviolet laser beam in non-contact manner into a shape to provide a most appropriate reflective wavefront.Type: GrantFiled: April 2, 1996Date of Patent: March 17, 1998Assignee: Nippon Aspherical Lens Co., Ltd.Inventors: Takahisa Jitsuno, Nobuaki Nakashima, Masahiro Nakatsuka, Keiu Tokumura