Patents Assigned to Sumita Optical Glass, Inc.
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Patent number: 6784128Abstract: The present invention provides an optical glass for press molding, in particular, a low softening point glass which contains, in an oxide glass of phosphate type, a durability improving component in addition to glass forming components, and has a weight loss of at most 0.15 weight % in a durability test, and which is represented, in term of elements for making up the glass, by the following chemical composition (mol %): P2O5 32 to 40% Li2O 6 to 21% Na2O 8 to 31% K2O 4 to 22% Al2O3 7.4 to 16% ZnO 0 to 19.6% BaO 0 to 12% and Sum of Li2O + Na2O + K2O 35.1 to 49%.Type: GrantFiled: July 12, 2002Date of Patent: August 31, 2004Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Otsuka, Yoshinori Yamamoto, Koichi Tsuchiya, Naruhito Sawanobori, Shinobu Nagahama
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Publication number: 20030153450Abstract: The present invention provides an optical glass for press molding, in particular, a low softening point glass which contains, in an oxide glass of phosphate type, a durability improving component in addition to glass forming components, and has a weight loss of at most 0.15 weight % in a durability test, and which is represented, in term of elements for making up the glass, by the following chemical composition (mol %): 1 P2O5 32 to 40% Li2O 6 to 21% Na2O 8 to 31% K2O 4 to 22% Al2O3 7.4 to 16% ZnO 0 to 19.6% BaO 0 to 12% and Sum of Li2O + Na2O + K2O 35.Type: ApplicationFiled: July 12, 2002Publication date: August 14, 2003Applicant: Sumita Optical Glass, Inc.Inventors: Masaaki Otsuka, Yoshinori Yamamoto, Koichi Tsuchiya, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 6372155Abstract: The object of the present invention is to provide an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, whereby energy can be accumulated by radiation excitation, for example, by &ggr;-rays, X-rays, UV-rays, etc. and light emission can be continued for a long time even after stopping the excitation. That is, the present invention relates to an oxide glass capable of exhibiting a long lasting afterglow and photostimulated luminescence, characterized by a constitutional composition comprising, at least, terbium oxide (Tb2O3) or manganese oxide (MnO), gallium oxide (Ga2O3) or aluminum oxide (Al2O3), alkali metal oxide or alkaline earth metal oxide and boron oxide (B2O3) or silicon oxide (SiO2) or zinc oxide (ZnO).Type: GrantFiled: November 30, 1999Date of Patent: April 16, 2002Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Yamazaki, Yoshinori Yamamoto, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 6333282Abstract: The present invention provides an optical glass for precision molding, having excellent properties, i.e. yield temperature (At) of at most 550° C., refractive index (nd) of at least 1.83 and Abbe number (&ngr;d) of at most 26.0 and further providing a low softening property as well as an improved mass production property with less coloration, which is represented, in term of atoms for making up the glass, by the following chemical composition (wt %) P2O5 14.0 to 31.0% B2O3 0 to 5.0% GeO2 0 to 14.0% Sum of P2O5 + B2O3 + GeO2 14.0 to 35.0% Li2O 0 to 6.0% Na2O 2.5 to 14.0% Sum of Li2O + Na2O 2.5 to 15.0% Nb2O5 22.0 to 50.0% WO3 0 to 30.0% Bi2O3 5.0 to 36.0% BaO 0 to 22.0%.Type: GrantFiled: August 9, 2000Date of Patent: December 25, 2001Assignee: Sumita Optical Glass, Inc.Inventors: Koji Nakahata, Koichi Tsuchiya, Shinobu Nagahama
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Patent number: 6271160Abstract: The present invention provides an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, can be used not only as a material for confirming an infrared laser or controlling an optical axis, but also as a material for recording or reproducing of &ggr;-rays, X-rays or UV-rays images and further can be used as an optical recording material of such a type that can be read. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %): GeO2 21 to 80% ZnO 0 to 50% Ga2O2 0 to 55% (ZnO + Ga2O3 = 3 to 55%) Tb2O3 0 to 10% MnO 0 to 2% (Tb2O3 + MnO = 0.01 to 10%) R2O 0 to 45% (R: at least one atom selected from Li, Na, K and Cs) R′O 0 to 40% (R′: at least one atom selected from Mg, Ca, Sr and Ba) R2O + R′O 0.Type: GrantFiled: May 12, 1999Date of Patent: August 7, 2001Assignee: Sumita Optical Glass, Inc.Inventors: Yoshinori Yamamoto, Masaaki Yamazaki, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 6123872Abstract: The present invention provides an oxide glass capable of exhibiting a long lasting afterglow and photostimulated phosphorescence, whereby energy can be accumulated by radiation excitation, for example, by .gamma.-rays, X-rays, UV-rays, etc., light emission can be continued for a long time even after stopping the excitation. Furthermore, the long lasting afterglow and photostimulated luminescence oxide glass can be used not only as a phosphorescent material for night illumination or night signal, but also as a material for confirming an infrared laser or controlling an optical axis because of exhibiting photostimulated luminescence by irradiation of infrared rays or visible rays. In addition, this glass is useful for recording or reproducing of .gamma.-rays, X-rays or UV-rays images. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %):______________________________________ SiO.sub.2 1 to 55% B.sub.2 O.sub.3 1 to 50% (SiO.sub.2 + B.sub.2 O.Type: GrantFiled: December 16, 1998Date of Patent: September 26, 2000Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Yamazaki, Yoshinori Yamamoto, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 5961883Abstract: A glass material is provided which is capable of exhibiting fluorescence in the visible region by ultraviolet ray excitation. This glass material is represented, in term of atoms for making up the glass, by the following chemical composition (mol %):______________________________________ SiO.sub.2 2 to 60%, B.sub.2 O.sub.3 5 to 70% (SiO.sub.2 + B.sub.2 O.sub.3 = 50 to 70%) RO 5 to 30% (R: at least one atom selected from Mg, Ca, Sr and Ba) ZnO 0 to 15% ZrO.sub.2 0 to 10%, Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3 2 to 15% (containing either of Tb.sub.2 O.sub.3 or Eu.sub.2 O.sub.3) Ln.sub.2 O.sub.3 0 to 20% (Ln: at least one atom selected from Y, La, Gd, Yb, Lu, Sm, Dy and Tm) CeO.sub.2 0 to 1% Bi.sub.2 O.sub.3 0 to 2% Sb.sub.2 O.sub.3 0.01 to 0.5% and R'.sub.Type: GrantFiled: December 11, 1997Date of Patent: October 5, 1999Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Yamazaki, Masaaki Otsuka, Hideaki Takaku, Naruhito Sawanobori
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Patent number: 5755998Abstract: According to the present invention, there is provided a fluorophosphate fluorescent glass, capable of converting invisible ultraviolet rays into visually observable visible rays with a high efficiency and available for controlling the optical axis of a laser beam such as excimer laser, etc. The feature of this fluorescent glass consists in a fluorophosphate fluorescent glass capable of exhibiting fluorescence in the visible region, having a chemical composition comprising, at least, (I) phosphorus (P), oxygen (O) and fluorine (F), as glass constituting components, and (II) at least one member selected from the group consisting of divalent europium, terbium, samarium and manganese, as a fluorescent agent, the divalent europium being contained as an essential component and at least one of samarium and manganese being contained as an essential component when terbium is contained.Type: GrantFiled: November 20, 1996Date of Patent: May 26, 1998Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Yamazaki, Masaaki Otsuka, Shinobu Nagahama, Naruhito Sawanobori
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Patent number: 5635109Abstract: According to the present invention, there is provided a fluorescent glass of the present invention is capable of converting invisible ultraviolet rays into visually observable visible rays with a high efficiency and available for controlling the optical axis of a laser beam such as excimer laser, etc. The feature of this fluorescent glass consists in a Tb- or Eu-containing fluorophosphate fluorescent glass having a chemical composition comprising, at least, phosphorus (P), oxygen (O) and fluorine (F), and further containing Tb or Eu as a fluorescent agent, and specifically comprising, in terms of atoms for making up the glass (mol %):______________________________________ P 1.about.15 Al 1.about.18 Mg 0.about.12 Ca 0.about.18 Sr 0.5.about.21 Ba 0.5.about.28 Zn 0.about.3.5 R 0.about.10 Ln 0.8.about.8 Ln' 0.about.6.5 Ce 0.about.0.2 O 4.about.55 F 15.about.Type: GrantFiled: October 30, 1995Date of Patent: June 3, 1997Assignee: Sumita Optical Glass, Inc.Inventor: Masaaki Otsuka
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Patent number: 5545595Abstract: A high efficiency wavelength up-conversion transparent glass ceramics composition is provided containing a rare earth ion, which can be applied to short wavelength solid lasers, full color displays, infrared light detecting sensors, etc. The ceramic composition has the following chemical composition, in which fluoride fine crystals containing rare earth ions are preferentially precipitated:______________________________________ SiO.sub.2 10-60 mol % AlO.sub.1.5 0-40 mol % GaO.sub.1.5 0-40 mol % PbF.sub.2 5-60 mol % CdF.sub.2 0-60 mol % GeO.sub.2 0-30 mol % TiO.sub.2 0-10 mol % ZrO.sub.2 0-10 mol % ReF.sub.3 or ReO.sub.1.5 0.05-30 mol % (Re = Er, Tm, Ho, Yb, Pr, etc.Type: GrantFiled: March 8, 1995Date of Patent: August 13, 1996Assignees: Sumita Optical Glass, Inc., Nippon Telegraph and Telephone CorporationInventors: Yuhu Wang, Junichi Ohwaki
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Patent number: 5541012Abstract: A new infrared-to-visible up-conversion material is provided which can be applied to an infrared light identification element having a useful conversion efficiency and sensitivity for infrared light in the wavelength of 1.5 .mu.m band, 0.98 .mu.m band and 0.8 .mu.m band without the necessity of previous excitation of the material. This infrared-to-visible up-conversion material consists of an inorganic material comprising at least two elements of erbium (Er) and a halogen or compounds thereof.Type: GrantFiled: October 26, 1994Date of Patent: July 30, 1996Assignees: Nippon Telegraph and Telephone Corporation, Sumita Optical Glass, Inc.Inventors: Junichi Ohwaki, Yuhu Wang, Atsushi Shibukawa, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 5472471Abstract: An optical fiber bundle for heat resistance and vacuum resistance which can be used even at a very high temperature or high vacuum is provided in economical manner. This is accomplished by a process for the production of an optical fiber bundle for heat resistance and vacuum resistance, which comprises making up optical fiber filaments each having a core part and a clad part into a bundle, closely fusion-bonding the end of the optical fiber bundle with a bonding glass and then subjecting the bonding glass to a crystallization treatment to increase the heat resistance.Type: GrantFiled: November 1, 1994Date of Patent: December 5, 1995Assignee: Sumita Optical Glass, Inc.Inventors: Nobuyoshi Baba, Shinobu Nagahama, Koji Moriya, Junya Yamauchi
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Patent number: 5420080Abstract: A high efficiency wavelength up-conversion transparent glass ceramics composition is provided containing a rare earth ion, which can be applied to short wavelength solid lasers, full color displays, infrared light detecting sensors, etc. The ceramic composition has the following chemical composition, in which fluoride fine crystals containing rare earth ions are preferentially precipitated:______________________________________ SiO.sub.2 10-60 mol % AlO.sub.1.5 0-40 mol % GaO.sub.1.5 0-40 mol % PbF.sub.2 5-60 mol % CdF.sub.2 0-60 mol % GeO.sub.2 0-30 mol % TiO.sub.2 0-10 mol % ZrO.sub.2 0-10 mol % ReF.sub.3 or ReO.sub.1.5 0.05-30 mol % (Re = Er, Tm, Ho, Yb, Pr, etc.).Type: GrantFiled: August 25, 1994Date of Patent: May 30, 1995Assignees: Sumita Optical Glass, Inc., Nippon Telegraph and Telephone CorporationInventors: Yuhu Wang, Junichi Ohwaki
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Patent number: 5322541Abstract: A method of producing a glass blank, comprising the steps of: supplying a desired weight of molten glass material to a bearer heated to a temperature of not more than a softening point of the glass material; performing and cancelling, at a temperature of not less than the softening point, pressing of the glass material supplied to the bearer so as to adjust a thickness of the glass material; and cooling the glass material to a temperature of not more than the softening point.Type: GrantFiled: March 26, 1992Date of Patent: June 21, 1994Assignees: Matsushita Electric Industrial Co., Ltd., Sumita Optical Glass, Inc.Inventors: Yoshiyuki Shimizu, Shoji Nakamura, Tadayoshi Yonemoto, Masaaki Sunohara, Tadao Shioyama, Noriyuki Kawata
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Patent number: 5284501Abstract: The invention provides a method of manufacturing extremely precise glass optical element by thermally deforming optical glass on the optical surf ace of a thermal processing jig coated with chemically stable thin film, followed by the molding of optical glass preform having free surf ace on one side and transcribed surface from the optical surface of the thermal processing jig by means of a press mold which thermally presses the optical glass preform.Type: GrantFiled: August 19, 1992Date of Patent: February 8, 1994Assignees: Sumita Optical Glass, Inc., Matsushita Electric Industrial Co., Ltd.Inventors: Hideto Monji, Kiyoshi Kuribayashi, Makoto Umetani, Noriyuki Kawata
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Patent number: 5171347Abstract: The invention provides a method of manufacturing extremely precise glass optical element by thermally deforming optical glass on the optical surface of a thermal processing jig coated with chemically stable thin film, followed by the molding of optical glass preform having free surface on one side and transcribedsurface from the optical surface of the thermal processing jig by means of a press mold which thermally presses the optical glass preform.Type: GrantFiled: April 10, 1992Date of Patent: December 15, 1992Assignees: Matsushita Electric Industrial Co., Ltd., Sumita Optical Glass, Inc.Inventors: Hideto Monji, Kiyoshi Kuribayashi, Makoto Umetani, Noriyuki Kawata
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Patent number: 5120343Abstract: An apparatus of producing an optical glass element of the present invention comprises the steps of displacing a gob of optical glass on a first heat working jig to a second heat working jig by making the gob of optical glass to adhere to the second heat working jig on the basis of the difference in wettability with high temperature glass between the first heat working jig and the second heat working jig, thermally deforming the gob of optical glass on the second heat working jig to form an optical glass preform, and forming the optical glass preform under heating and pressure by using pressing moulds to form an optical glass element.Type: GrantFiled: November 8, 1991Date of Patent: June 9, 1992Assignees: Matsushita Electric Industrial Co., Ltd., Sumita Optical Glass, Inc.Inventors: Hideto Monji, Kiyoshi Kuribayashi, Masaaki Sunohara, Tadayoshi Yonemoto, Noriyuki Kawata, Tadao Shioyama, Makoto Umetani
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Patent number: 5087279Abstract: A method and apparatus are provided for producing an optical glass element, including displacing a gob of optical glass on a first heat working jig to a second heat working jig by making the gob of optical glass adhere to the second heat working jig due to a difference in wettability with high temperature glass between the first heat working jig and the second heat working jig. The gob of optical glass on the second heat working jig is thermally deformed to form an optical glass preform. The optical glass preform is formed under heat and pressure by using pressure molds to form an optical glass element.Type: GrantFiled: July 6, 1990Date of Patent: February 11, 1992Assignees: Matsushita Electric Industrial Co., Ltd., Sumita Optical Glass, Inc.Inventors: Hideto Monji, Kiyoshi Kuribayashi, Masaaki Sunohara, Tadayoshi Yonemoto, Noriyuki Kawata, Tadao Shioyama, Makoto Umetani
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Patent number: 5017520Abstract: A fluorophosphate optical glass having optical constants, i.e. a refractive index of 1.45 to 1.54 and an Abbe number of 75 to 90, preferably 75 to 89.5, useful as a lens for an optical instrument to obtain a good quality image, is provided, which has a chemical composition (% by mole) comprising:______________________________________ P.sub.2 O.sub.5 6.8-19.0% Al.sub.2 O.sub.3 1.5-6.0% BaO 0.3-6.6% AlF.sub.3 16.6-26.3% MgF.sub.2 2.5-19.0% CaF.sub.2 8.0-28.0% SrF.sub.2 9.7-35.0% BaF.sub.2 7.9-35.0% NaF 0.5-4.0% Gd.sub.2 O.sub.3 1.0-6.0% Y.sub.2 O.sub.3 0-3.5% La.sub.2 O.sub.3 0-3.5% Yb.sub.2 O.sub.3 0-3.5% sum of Gd.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3 and Yb.sub.2 O.sub.3 1.0-6.0% GdF.sub.3 0-2.0% CaO 0-3.5% SrO 0-3.5% ZnO 0-3.5% MgO 0-3.Type: GrantFiled: November 22, 1989Date of Patent: May 21, 1991Assignee: Sumita Optical Glass, Inc.Inventors: Masaaki Otsuka, Masayuki Komiya, Naruhito Sawanobori, Shinobu Nagahama
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Patent number: 4990468Abstract: A fluorophosphate optical glass having optical constants, i.e. refractive index (nd) of 1.54 to 1.60 and Abbe number (.nu.d) of 68 to 75 and having abnormal partial dispersion represented by a relative partial dispersion of at least 0.537 is provided, which has a chemical composition (% by weight) comprising:______________________________________ Al(PO.sub.3).sub.3 15-32% Ba(PO.sub.3).sub.2 0-10% Sr(PO.sub.3).sub.2 0-10% Ca(PO.sub.3).sub.2 0-10% Mg(PO.sub.3).sub.2 0-10% sum of metaphosphates 20-32% BaF.sub.2 20-70% SrF.sub.2 5-40% CaF.sub.2 0-15% MgF.sub.2 0-10% AlF.sub.3 0-5% GdF.sub.3 0-5% sum of fluorides 55-75% Gd.sub.2 O.sub.3 5-22% La.sub.2 O.sub.3 0-7% Y.sub.2 O.sub.3 0-10% Yb.sub.2 O.sub.Type: GrantFiled: September 29, 1989Date of Patent: February 5, 1991Assignee: Sumita Optical Glass, Inc.Inventors: Masayuki Komiya, Masaaki Otsuka, Naruhito Sawanobori, Shinobu Nagahama