WO2019142603A1 - Verre optique - Google Patents

Verre optique Download PDF

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Publication number
WO2019142603A1
WO2019142603A1 PCT/JP2018/047298 JP2018047298W WO2019142603A1 WO 2019142603 A1 WO2019142603 A1 WO 2019142603A1 JP 2018047298 W JP2018047298 W JP 2018047298W WO 2019142603 A1 WO2019142603 A1 WO 2019142603A1
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WO
WIPO (PCT)
Prior art keywords
glass
less
content
optical glass
refractive index
Prior art date
Application number
PCT/JP2018/047298
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English (en)
Japanese (ja)
Inventor
俣野高宏
高山佳久
Original Assignee
日本電気硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2019142603A1 publication Critical patent/WO2019142603A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements

Definitions

  • the present invention relates to an optical glass particularly suitable as an optical lens of a digital camera or video camera or a lens for optical communication.
  • the conventional SiO 2 -Nb 2 O 5 -based glass has desired optical properties, it has a problem that the devitrification is strong and the mass productivity is poor.
  • an object of the present invention is to provide an optical glass which has desired optical properties, is excellent in devitrification resistance, and is excellent in mass productivity.
  • the optical glass of the present invention is SiO 2 -Ta 2 having a refractive index (nd) of 1.59 to 1.80, an Abbe number ( ⁇ d) of 25 to 55, and a partial dispersion ratio ( ⁇ g, F) of 0.605 or less O 5 -R 2 O (R is at least one selected from Li, Na, and K) and contains Nb 2 O 5 0 to less than 25%, TiO 2 more than 0 to 20% by mass% It is characterized by The SiO 2 -Ta 2 O 5 -R 2 O-based glass means a glass containing SiO 2 , Ta 2 O 5 and R 2 O as essential components.
  • the main cause of devitrification in conventional SiO 2 -Nb 2 O 5 glasses is to increase the refractive index and to increase the anomalous dispersion (decrease the partial dispersion ratio). It was found that a large amount of Nb 2 O 5 which is a component of is contained. Therefore, a SiO 2 -Ta 2 O 5 -R 2 O-based glass containing Ta 2 O 5 as an essential component, which is also a component that reduces the content of Nb 2 O 5 as much as possible and also reduces the refractive index and the partial dispersion ratio It has been found that devitrification can be suppressed while achieving high refractive index and low partial dispersion ratio.
  • the weather resistance is also improved, and deterioration of physical properties, deterioration of the glass surface, and the like are less likely to occur during the manufacturing process or product use.
  • the R 2 O as an essential component, it is possible to obtain a glass of low dispersion.
  • the optical glass of the present invention further, in mass%, SiO 2 20 ⁇ 70% , Ta 2 O 5 6 ⁇ 70%, ZrO 2 0 ⁇ 15%, P 2 O 5 0 ⁇ 10%, R 2 O (R Preferably contains at least one selected from Li, Na and K) and more than 0 to 40%, and substantially does not contain a lead component, an arsenic component and a fluorine component. “R 2 O more than 0 to 40%” means that the total content of Li 2 O, Na 2 O and K 2 O is more than 0 to 40%.
  • the optical glass of the present invention may further contain, by mass%, R′O (R ′ is at least one selected from Mg, Ca, Sr, and Ba) 0 to less than 10%, ZnO 0 to 15% preferable.
  • R′O 0 to less than 10% means that the total content of MgO, CaO, SrO and BaO is 0 to less than 10%.
  • the optical glass of the present invention preferably further contains 0 to 15% of B 2 O 3 in mass%.
  • the optical glass of the present invention preferably further contains, by mass%, 0 to 10% of La 2 O 3 + Gd 2 O 3 + Bi 2 O 3 + Y 2 O 3 + Yb 2 O 3 + TeO 2 + GeO 2 .
  • La 2 O 3 + Gd 2 O 3 + Bi 2 O 3 + Y 2 O 3 + Yb 2 O 3 + TeO 2 + GeO 2 is La 2 O 3 , Gd 2 O 3 , Bi 2 O 3 , Y 2 O 3 , Yb 2 O 3 Mean the total content of TeO 2 and GeO 2 .
  • the optical glass of the present invention preferably has a weight ratio of SiO 2 / B 2 O 3 of 2 or more.
  • SiO 2 / B 2 O 3 means a value obtained by dividing the content of SiO 2 by the content of B 2 O 3 .
  • the optical glass of the present invention preferably has a mass ratio of Nb 2 O 5 / Ta 2 O 5 of less than 15.
  • Nb 2 O 5 / Ta 2 O 5 means a value obtained by dividing the content of Nb 2 O 5 by the content of Ta 2 O 5 .
  • optical glass which has a desired optical characteristic and is favorable in devitrification resistance and excellent in mass-productivity.
  • the optical glass of the present invention has a refractive index (nd) of 1.59 to 1.80, an Abbe number ( ⁇ d) of 25 to 55, and a partial dispersion ratio ( ⁇ g, F) of 0.605 or less.
  • nd refractive index
  • ⁇ d Abbe number
  • ⁇ g, F partial dispersion ratio
  • the refractive index of the optical glass of the present invention is 1.59 or more, preferably 1.6 or more, 1.61 or more, 1.62 or more, and particularly preferably 1.63 or more.
  • the refractive index of glass of the present invention is 1.80 or less, 1.79 or less, 1.78 or less, 1.77 or less, 1.76 or less, in particular 1.75 or less preferable.
  • the Abbe number of the optical glass of the present invention is 25 or more, preferably 26 or more, 27 or more, and particularly 28 or more, in order to achieve low dispersion characteristics.
  • the component that improves the Abbe number such as R 2 O, is also a component that reduces the refractive index. Therefore, it is necessary to define the upper limit of the Abbe number in consideration of the refractive index.
  • the Abbe number of the optical glass of the present invention is 55 or less, preferably 53 or less, 51 or less, 49 or less, 47 or less, particularly 45 or less.
  • the partial dispersion ratio of the optical glass of the present invention is preferably 0.605 or less, more preferably 0.604 or less, and particularly preferably 0.603 or less, in order to achieve anomalous dispersion characteristics.
  • components such as Nb 2 O 5 which lower the partial dispersion ratio of the glass make the glass unstable. Therefore, it is necessary to define the lower limit of the partial dispersion ratio in consideration of the stability of the glass.
  • the partial dispersion ratio of the optical glass of the present invention is preferably 0.55 or more, particularly 0.555 or more.
  • the optical glass of the present invention is composed of SiO 2 -Ta 2 O 5 -R 2 O (R is at least one selected from Li, Na, and K) based glass, and Nb 2 O 5 0 to 25% by mass% Less than, contains TiO 2 0 to more than 20%.
  • R is at least one selected from Li, Na, and K
  • Nb 2 O 5 0 to 25% by mass% Less than contains TiO 2 0 to more than 20%.
  • the characteristics having a refractive index of 1.59 to 1.80, an Abbe number of 25 to 55, and a partial dispersion ratio of 0.605 or less can be easily achieved.
  • SiO 2 is a component that forms a glass skeleton. Moreover, it has the effect of improving the weather resistance, and in particular, the effect of suppressing the selective elution of components such as alkali metal oxides in the glass into water is high. Furthermore, it is a component which can lower liquidus temperature and can control devitrification.
  • the content of SiO 2 is preferably 20 to 70%, 21 to 65%, 22 to 60%, particularly 25 to 55%. When the content of SiO 2 is too small, it is difficult to obtain the above effect. On the other hand, if the content of SiO 2 is too large, the meltability may be reduced and cords and bubbles due to unmelted may easily remain in the glass, and the required quality as glass for lens may not be satisfied.
  • Ta 2 O 5 is a component for achieving high refractive index and is a component having a high effect of reducing the partial dispersion ratio. Further, among the components capable of achieving high refractive index, it is a component which is relatively difficult to raise the liquidus temperature (it is difficult to cause devitrification).
  • the content of Ta 2 O 5 is preferably 6 to 70%, 10 to 60%, 15 to 50%, and particularly preferably 20 to 45%. When the content of Ta 2 O 5 is too small, the above-mentioned effect is hardly obtained. On the other hand, if the content of Ta 2 O 5 is too large, the liquidus temperature rises and crystals mainly composed of Ta 2 O 5 tend to be precipitated, which tends to make vitrification difficult.
  • R 2 O (R is at least one selected from Li, Na and K) is a component to achieve low dispersion, and is a component to reduce the partial dispersion ratio. It also has the effect of lowering the softening point and facilitating vitrification.
  • the content of R 2 O is preferably more than 0 to 40%, 0.5 to 37.5%, 1 to 35%, 1.5 to 32.5%, particularly 2 to 30%. When the content of R 2 O is too small, the above-described effect is hardly obtained. On the other hand, when the content of R 2 O is too large, chemical durability tends to be reduced. In addition, it becomes difficult to obtain high refractive glass.
  • the content of each component of Li 2 O, Na 2 O and K 2 O is 0 to 40%, 0.1 to 37.5%, 0.5 to 35%, 1 to 32.5%, in particular It is preferably 1.5 to 30%.
  • Nb 2 O 5 is a component for achieving high refractive index, and also has an effect of reducing the partial dispersion ratio.
  • the content of Nb 2 O 5 is 0 to less than 25%, preferably 0.1 to 20%, 0.5 to 15%, and particularly preferably 1 to 10%.
  • Li 2 O and Nb 2 O 5 are preferably 45% or less, 40% or less, 30% or less, and particularly 25% or less.
  • TiO 2 is a component for achieving high refractive index, and also has an effect of reducing the partial dispersion ratio. Moreover, coloring of the glass by ultraviolet light can be suppressed.
  • the content of TiO 2 is preferably more than 0 to 20%, 0.1 to 17%, 0.5 to 15%, and particularly preferably 1 to 13%. When the content of TiO 2 is too small, the above-mentioned effect is hardly obtained. On the other hand, when the content of TiO 2 is too large, the devitrification resistance tends to be reduced and the vitrification tends to be difficult. In addition, the visible light transmittance tends to be reduced.
  • TiO 2 + Ta 2 O 5 is preferably 18% or more, 20% or more, 30% or more, and particularly preferably 40% or more.
  • Nb 2 O 5, Ta 2 O 5 the effect of lowering the partial dispersion ratio in the TiO 2 is the largest amount is Ta 2 O 5, then TiO 2, then a Nb 2 O 5.
  • Nb 2 O 5 and Ta 2 O 5 , TiO 2 and Ta 2 O 5 , SiO 2 and Ta 2 O 5 , and further Nb 2 O 5 and TiO 2 It is preferable to appropriately adjust the ratio of each content of + Ta 2 O 5 .
  • Nb 2 O 5 / Ta 2 O 5 is less than 15, 10 or less, and particularly 3 or less in mass ratio.
  • TiO 2 / Ta 2 O 5 is preferably 5 or less, 4 or less, and particularly 1 or less.
  • SiO 2 / Ta 2 O 5 is 5 or less, 3 or less, and particularly 2 or less in mass ratio.
  • Nb 2 O 5 / (TiO 2 + Ta 2 O 5 ) be 10 or less, 5 or less, particularly 2 or less in mass ratio.
  • TiO 2 / Ta 2 O 5 , SiO 2 / Ta 2 O 5 and Nb 2 O 5 / (TiO 2 + Ta 2 O 5 ) is larger than the above range, It becomes difficult to obtain a low partial dispersion ratio.
  • the optical glass of the present invention can contain the following components in addition to the components described above.
  • ZrO 2 is a component that can increase the refractive index.
  • the glass skeleton is formed as an intermediate oxide, there is also an effect of improving the devitrification resistance and improving the chemical durability.
  • the content of ZrO 2 is 0 to 15%, 0 to 12.5%, 0 to 10%, 0 to 8%, 0.1 to 7.5%, and in particular 0.5 to 6.5%. Is preferred.
  • P 2 O 5 is a component for forming a glass skeleton, and has an effect of suppressing the devitrification and improving the weather resistance. It also has the effect of increasing the Abbe number.
  • the content of P 2 O 5 is preferably 0 to 10%, particularly 0 to 5%.
  • R'O (R 'is at least one selected from Mg, Ca, Sr, and Ba) is a component capable of increasing the refractive index.
  • the glass skeleton is formed as an intermediate oxide, there is also an effect of improving the devitrification resistance and improving the chemical durability.
  • these components increase the partial dispersion ratio, it is difficult to obtain desired optical properties if the content is too large. Accordingly, the content of R′O is preferably 0 to less than 10%, 0 to 8%, 0.1 to 7.5%, and particularly 0.5 to 6.5%.
  • the content of each component of MgO, CaO, SrO and BaO is preferably 0 to 8%, 0 to 5%, particularly 0.1 to 3%.
  • ZnO is a component that can increase the refractive index.
  • the glass skeleton is formed as an intermediate oxide, there is also an effect of improving the devitrification resistance and improving the chemical durability.
  • ZnO increases the partial dispersion ratio, it is difficult to obtain desired optical characteristics if the content is too large. Therefore, the content of ZnO is preferably 0 to 15%, 0 to 8%, particularly 0.1 to 7%.
  • the ratio of the content of MgO, CaO, SrO, BaO, ZnO and ZrO 2 (MgO + CaO + SrO + BaO + ZnO + ZrO 2 ) to the content of Ta 2 O 5 is appropriately adjusted. Is preferred. Specifically, (MgO + CaO + SrO + BaO + ZnO + ZrO 2 ) / Ta 2 O 5 is preferably 0.5 or less, 0.4 or less, and particularly 0.3 or less.
  • B 2 O 3 is a component capable of forming a glass skeleton. Moreover, it has the effect of improving the weather resistance, and in particular, the effect of suppressing the selective elution of the components in the glass into water is high.
  • the content of B 2 O 3 is preferably 0 to 15%, less than 0 to 15%, 0 to 10%, and particularly 0.1 to 5%. When the content of B 2 O 3 is too large, the partial dispersion ratio tends to increase. In addition, it becomes difficult to obtain high refractive properties.
  • the optical glass of the present invention in order to achieve a low partial dispersion ratio, it is preferable to appropriately adjust the ratio of the content of SiO 2 to the content of B 2 O 3 . Specifically, it is preferable that SiO 2 / B 2 O 3 be 2 or more, 2.5 or more, and particularly 3 or more.
  • La 2 O 3 , Gd 2 O 3 , Bi 2 O 3 , Y 2 O 3 , Yb 2 O 3 , TeO 2 and GeO 2 are components for increasing the refractive index.
  • these components increase the partial dispersion ratio, it is difficult to obtain desired optical properties if the content is too large. Therefore, 0 to 10%, 0 to 9%, 0.1 to 8%, particularly 0.5 to 5 of La 2 O 3 + Gd 2 O 3 + Bi 2 O 3 + Y 2 O 3 + Yb 2 O 3 + TeO 2 + GeO 2 % Is preferred.
  • WO 3 is a component for achieving high refractive index, and also has an effect of reducing the partial dispersion ratio. Moreover, coloring of the glass by ultraviolet light can be suppressed. However, when the content is too large, the devitrification resistance tends to be reduced to make vitrification difficult, or the ultraviolet region transmittance tends to be reduced. In addition, affinity with the press die is increased, and the glass tends to be easily fused to the die at the time of mold press molding. Accordingly, the content of WO 3 is preferably 0 to 10%, 0 to 5%, particularly 0 to 1%.
  • Al 2 O 3 is a component capable of forming a glass skeleton. Moreover, it has the effect of improving the weather resistance, and in particular, the effect of suppressing the selective elution of the components in the glass into water is high.
  • the content of Al 2 O 3 is preferably 0 to 10%, particularly 0 to 1%. When the content of Al 2 O 3 is too large, devitrification tends to occur. In addition, the meltability may be lowered and cords and air bubbles may remain in the glass, and the required quality as a lens glass may not be satisfied.
  • Sb 2 O 3 , SnO 2 , CeO 2 , NO 3 or SO 3 can be included as a fining agent.
  • a small amount of Sb 2 O 3 also has the effect of improving the visible region transmittance.
  • the content of the above-mentioned fining agent is too large, there is a possibility that unwanted coloration may occur, so the content of each of these components is preferably 5% or less.
  • Lead components for example, PbO
  • arsenic components for example, As 2 O 3
  • fluorine components for example, F 2
  • PbO lead components
  • arsenic components for example, As 2 O 3
  • fluorine components for example, F 2
  • a glass raw material prepared to have a desired composition is melted.
  • molten glass is dropped from the tip of the nozzle and formed into droplets (droplet formation) to obtain a glass material.
  • mold pressing is performed to obtain an optical lens having a predetermined shape. It is also possible to adopt a method of forming a molten glass into an ingot shape, polishing the glass material cut into an appropriate size, and performing mold press forming instead of performing the droplet formation.
  • the optical lens made of the optical glass of the present invention can also be assembled into a metal part and used as a lens cap.
  • Tables 1 and 2 show examples of the present invention (samples Nos. 1 to 21) and comparative examples (sample No. 22).
  • Each sample was prepared as follows. First, a glass material was prepared so as to have each composition shown in the table, and was melted at 1500 ° C. for 2 hours using a platinum crucible. The obtained molten glass was poured out onto a carbon plate, and after annealing, a sample suitable for each measurement was produced.
  • the refractive index (nd), the Abbe's number ( ⁇ d), and the partial dispersion ratio ( ⁇ g, F) of the obtained sample were measured. The results are shown in the table.
  • the refractive index is indicated by the measured value for the d line (587.6 nm) of the helium lamp.
  • the Abbe number ( ⁇ ⁇ d) ⁇ (nd ⁇ ) using the refractive index of the d line of the helium lamp and the refractive index of the F line (486.1 nm) and the C line (656.3 nm) of the hydrogen lamp. 1) / (nF-nC) ⁇ .
  • the Nos. 1 and 2 which are examples of the present invention.
  • the samples 1 to 21 are vitrified without devitrification, and the refractive index is 1.6394 to 1.7980, the Abbe number is 28.6 to 38.6, and the partial dispersion ratio is 0.5698 to 0.5938 And had the desired optical properties.
  • No. 1 as a comparative example. Twenty-two samples were not vitrified.
  • the optical glass of the present invention is a glass material for mold press molding and a glass material for polishing, such as an optical pickup lens for CD, MD, DVD, and other various optical disk systems, a photographing lens for a video camera, a digital camera and other general cameras, It is suitable as glass for communication lenses and the like.

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  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention concerne un verre optique présentant des caractéristiques optiques souhaitées, ainsi qu'une bonne résistance à la dévitrification et une excellente aptitude à la productivité en masse. Ce verre optique est caractérisé en ce qu'il comprend un verre de SiO2-Ta2O5-R2O (R étant le Li et/ou le Na et/ou le K) ayant un indice de réfraction (nd) compris entre 1,59 et 1,80, un nombre d'Abbe (νd) compris entre 25 et 55 et un rapport de dispersion partielle (θg, F) inférieur ou égal à 0,605 ; et en ce qu'il contient, en masse, entre 0% (inclus) et 25% (exclus) de Nb2O5 et entre 0% (exclus) à 20% (inclus) de TiO2.
PCT/JP2018/047298 2018-01-18 2018-12-21 Verre optique WO2019142603A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-006098 2018-01-18
JP2018006098A JP2019123651A (ja) 2018-01-18 2018-01-18 光学ガラス

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Publication Number Publication Date
WO2019142603A1 true WO2019142603A1 (fr) 2019-07-25

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5751149A (en) * 1980-07-14 1982-03-25 Jenaer Glaswerk Schott & Gen Acid-resistant hydrolysis-resistant low density optical and ophthalmic glass
JP2000344542A (ja) * 1999-05-06 2000-12-12 Carl Zeiss:Fa 無鉛光学ガラス
JP2013227187A (ja) * 2012-03-27 2013-11-07 Nippon Electric Glass Co Ltd 光学ガラス
JP2014114181A (ja) * 2012-12-07 2014-06-26 Ohara Inc 光学ガラス、プリフォーム及び光学素子
JP2014201476A (ja) * 2013-04-04 2014-10-27 日本電気硝子株式会社 光学ガラス

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5751149A (en) * 1980-07-14 1982-03-25 Jenaer Glaswerk Schott & Gen Acid-resistant hydrolysis-resistant low density optical and ophthalmic glass
JP2000344542A (ja) * 1999-05-06 2000-12-12 Carl Zeiss:Fa 無鉛光学ガラス
JP2013227187A (ja) * 2012-03-27 2013-11-07 Nippon Electric Glass Co Ltd 光学ガラス
JP2014114181A (ja) * 2012-12-07 2014-06-26 Ohara Inc 光学ガラス、プリフォーム及び光学素子
JP2014201476A (ja) * 2013-04-04 2014-10-27 日本電気硝子株式会社 光学ガラス

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