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公开(公告)号：DE68903825D1
公开(公告)日：1993-01-21
申请号：DE68903825
申请日：1989-10-03
Applicant: SUMITA OPTICAL GLASS
Inventor： KOMIYA MASAYUKI , OTSUKA MASAAKI , SAWANOBORI NARUHITO , NAGAHAMA SHINOBU
Abstract: 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: s
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公开(公告)号：DE68920837D1
公开(公告)日：1995-03-09
申请号：DE68920837
申请日：1989-11-27
Applicant: SUMITA OPTICAL GLASS
Inventor： OTSUKA MASAAKI , KOMIYA MASAYUKI , SAWANOBORI NARUHITO , NAGAHAMA SHINOBU
IPC: C03C3/247
Abstract: 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: i
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公开(公告)号：DE68920837T2
公开(公告)日：1995-05-24
申请号：DE68920837
申请日：1989-11-27
Applicant: SUMITA OPTICAL GLASS
Inventor： OTSUKA MASAAKI , KOMIYA MASAYUKI , SAWANOBORI NARUHITO , NAGAHAMA SHINOBU
IPC: C03C3/247
Abstract: 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: i
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公开(公告)号：DE68903825T2
公开(公告)日：1993-04-08
申请号：DE68903825
申请日：1989-10-03
Applicant: SUMITA OPTICAL GLASS
Inventor： KOMIYA MASAYUKI , OTSUKA MASAAKI , SAWANOBORI NARUHITO , NAGAHAMA SHINOBU
Abstract: 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: s
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公开(公告)号：JP2002201037A
公开(公告)日：2002-07-16
申请号：JP2000400607
申请日：2000-12-28
Applicant: SUMITA OPTICAL GLASS
Inventor： OTSUKA MASAAKI , KOMIYA MASAYUKI , SAWANOBORI SHIGETO , NAGAHAMA SHINOBU
Abstract: PROBLEM TO BE SOLVED: To obtain a glass composition suitable for manufacturing a preform material by the drip process. SOLUTION: This low refractive index, low dispersion optical glass for precision press forming comprises a composition, in mass%, of 25 to 50 SiO2, 15 to 40 B2O3, 0 to 12 Li2O, 0 to 25 Na2O, 0 to 20 K2O, where total of Li2O, K2O and Na2O is >18 and
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Patent Agency Ranking
公开(公告)号：JPH02283635A
公开(公告)日：1990-11-21
申请号：JP32398688
申请日：1988-12-22
Applicant: SUMITA OPTICAL GLASS
Inventor： KOMIYA MASAYUKI , OTSUKA MASAAKI , SAWANOBORI SHIGETO , NAGAHAMA SHINOBU
Abstract: PURPOSE:To provide the title glass having high light transmissivity in short wavelength region, easy to produce, made up of P2O5, Al2O3, BaO, AlF3, MgF2, CaF2, SrF2, BaCl2, BaF2 and NaF at a specified molar ratio. CONSTITUTION:The objective glass made up of (A) 0.5-8mol% of P2O5, (B) 0.1-2mol% of Al2O3, (C) 0.5-7mol% of BaO, (D) 29-42mol% of AlF3, (E) 5-13mol% of MgF2, (F) 15-30.5mol% of CaF2, (G) 10-22mol% of SrF2, (H) 0.5-16.5mol% of BaCl2, (I) 0-11mol% of BaF2 and (J) 0-7.5mol% of NaF. To produce the present glass, the above raw materials are mixed at a specified ratio and melted at ca. 900-1100 deg.C followed by casting in a conventional way. The present glass has high light transmissivity over a short wavelength region of 200 to 300nm, thus being suitably used for various kinds of optical instruments, etc., to be used over said short wavelength region.
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公开(公告)号：JPH01286934A
公开(公告)日：1989-11-17
申请号：JP11315288
申请日：1988-05-10
Applicant: SUMITA OPTICAL GLASS
Inventor： BABA NOBUYOSHI , KOMIYA MASAYUKI , NAGAHAMA SHINOBU
IPC: C03C3/068
Abstract: PURPOSE:To produce the subject glass having low softening point, high refractive index and low dispersion, at a relatively low temperature, by compounding B2O3, SiO2, La2O3, Gd2O3, Li2O, CaO and BaO at specific ratios. CONSTITUTION:A mixture is produced by compounding 10-35wt.% of B2O3, 5-30wt.% of SiO2, 0-35wt.% of La2O3, 0-35wt.% of Gd2O3 (La2O3+Gd2O3 is 20-40wt.%), 3-8wt.% of Li2O, 0-20wt.% of CaO and 0-25wt.% of BaO (CaO+BaO is 10-30wt.%). The mixture is optionally added with a small amount of As2O3 (defoaming and color-protection agent), melted at 1,100-1,300 deg.C, formed and cooled to obtain an optical glass for precision press forming having a deflection temperature (At) of
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公开(公告)号：JPH02149445A
公开(公告)日：1990-06-08
申请号：JP30462188
申请日：1988-12-01
Applicant: SUMITA OPTICAL GLASS
Inventor： OTSUKA MASAAKI , KOMIYA MASAYUKI , SAWANOBORI SHIGETO , NAGAHAMA SHINOBU
IPC: C03C3/247
Abstract: PURPOSE:To increase refractive index and Abbe's number and to obtain a high quality picture by mixing P2O5 with Al2O3, BaO, AlF3, MgF2, CaF2, SrF2, BaF2, NaF, Gd2O3, Y2O3, La2O3 and Yb2O3 and vitrifying the mixture by melting. CONSTITUTION:6.8-19.0mol% P2O5 is mixed with 1.5-6.0mol% Al2O3, 0.3-6.6% BaO, 16.6-26.3% AlF3, 2.5-19.0% MgF2, 8.0-28.0% CaF2, 9.7-35.0% SrF2, 7.9-35.0% BaF2, 0.5-4.0% NaF, 1.0-6.0% Gd2O3, 0-3.5% Y2O3, 0-3.5% La2O3, 0.3.5% Yb2O3 (Gd2O3+Y2O3+La2O3+Yb2O3=1.0-6.0%), 0-2.0% GdF3, 0-3.5% CaO, 0-3.5% SrO, 0-3.5% ZnO and 0-3.5% MgO and the mixture is vitrified by melting at 900-1,000 deg.C to obtain optical fluorophosphate glass having such optical constants as 1.45-1.54 refractive index and 75-90 Abbe's number.
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公开(公告)号：JPH05193979A
公开(公告)日：1993-08-03
申请号：JP1003992
申请日：1992-01-23
Applicant: SUMITA OPTICAL GLASS
Inventor： KOMIYA MASAYUKI , NAGAHAMA SHINOBU , SAWANOBORI SHIGETO
Abstract: PURPOSE:To provide optical glass capable of precision press forming at a low temp., requiring no grinding or polishing after precision press forming and having such optical constants as a specified refractive index and a specified Abbe's number. CONSTITUTION:This optical glass for precision press forming is low refractive index and low dispersion optical glass having a compsn. consisting of, by weight, 39-65% SiO2, 10-38% B2O3, 9-18%, in total, of 3-12% Li2O, 0-7% Na2O and 0-6.5% K2O, 5-15% Al2O3, 0-6% MgO, 0-6% CaO and 0-6% BaO and having
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公开(公告)号：JPH0551233A
公开(公告)日：1993-03-02
申请号：JP20807691
申请日：1991-08-20
Applicant: SUMITA OPTICAL GLASS
Inventor： KOMIYA MASAYUKI , NAKAHATA KOJI , NAGAHAMA SHINOBU
Abstract: PURPOSE:To provide optical glass for precision press molding capable of precision press molding at a low temp. and not requiring grinding or polishing after precision press molding. CONSTITUTION:This optical glass has a compsn. consisting of, by weight, 20-27%, in total, of 10-20% SiO2, 3-15% GeO2 and 0-7% B2O3, 44-54%, in total, of 19-29% TiO2, 17-29% Nb2O5 and 0-7% BaO, and 24-33%, in total of 0-3% Li2O, 7-18% Na2O, 0-22% K2O and 0-20% Cs2O, =1.76 refractive index (nd),
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