TW201827372A - Optical glass, preform, and optical element having high refractive index and high dispersion of color with low production cost - Google Patents

Optical glass, preform, and optical element having high refractive index and high dispersion of color with low production cost Download PDF

Info

Publication number
TW201827372A
TW201827372A TW106141614A TW106141614A TW201827372A TW 201827372 A TW201827372 A TW 201827372A TW 106141614 A TW106141614 A TW 106141614A TW 106141614 A TW106141614 A TW 106141614A TW 201827372 A TW201827372 A TW 201827372A
Authority
TW
Taiwan
Prior art keywords
component
glass
less
content
optical
Prior art date
Application number
TW106141614A
Other languages
Chinese (zh)
Other versions
TWI821167B (en
Inventor
向川勝之
Original Assignee
日商小原股份有限公司
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
Application filed by 日商小原股份有限公司 filed Critical 日商小原股份有限公司
Publication of TW201827372A publication Critical patent/TW201827372A/en
Application granted granted Critical
Publication of TWI821167B publication Critical patent/TWI821167B/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/12Silica-free oxide glass compositions
    • C03C3/16Silica-free oxide glass compositions containing phosphorus
    • C03C3/21Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00Other methods of shaping glass
    • C03B19/02Other methods of shaping glass by casting molten glass, e.g. injection moulding
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/18Stirring devices; Homogenisation
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements

Landscapes

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

Abstract

The present invention provides an optical glass, a preform, and an optical element, wherein the optical glass has optical characteristics of high refractive index and high dispersion of color, and the production cost of the glass is low. The optical glass contains, in mass%, more than 0% to 45.0% of a La2O3 component, more than 0% to 45.0% of a TiO2 component, and more than 0% to 40.0% of a BaO component. The total amount of the SiO2 component and the B2O3 component is 5.0% or more and 30.0% or less, the mass ratio of TiO2/(TiO2+BaO) is 0.10 or more and 0.90 or less, the refractive index (nd) is 1.90 or more, the Abbe number ([nu]d) is 30.0 or less, and the wavelength ([lambda]5) indicating the spectral transmittance of 5% is 400 nm or less.

Description

光學玻璃、預成形體以及光學元件  Optical glass, preforms, and optical components  

本發明是關於光學玻璃、預成形體及光學元件。 This invention relates to optical glass, preforms, and optical components.

近年,使用光學系統之機器的數位化,以及圖像、影像的高清晰化正急速地發展。尤其是圖像、影像的高清晰化,在數位相機或錄影機、投影機等光學機器,極為顯著。此外,在這同時,藉由削減內藏於這些光學機器的光學系統中之光學元件的數量,像是透鏡或稜鏡等,來達成輕量化、小型化。 In recent years, the digitization of machines using optical systems and the high definition of images and images are rapidly developing. In particular, the high definition of images and images is extremely remarkable in optical cameras such as digital cameras, video recorders, and projectors. Further, at the same time, weight reduction and miniaturization can be achieved by reducing the number of optical elements incorporated in the optical system of these optical devices, such as lenses or cymbals.

製作光學元件的光學玻璃之中,特別是對於具有1.90以上的高折射率(nd),15.0以上30.0以下的低阿貝數(νd)之高折射率高色散玻璃的需求變高,因為該種光學玻璃能夠達到使光學系統整體輕量化及小型化。作為這種高折射率低色散玻璃,已知如專利文獻1所代表的玻璃組成物。 Among the optical glasses in which optical elements are produced, in particular, the demand for high refractive index high dispersion glass having a high refractive index (n d ) of 1.90 or more and a low Abbe number (ν d ) of 15.0 or more and 30.0 or less is high because Such an optical glass can achieve an overall weight reduction and miniaturization of the optical system. As such a high refractive index low dispersion glass, a glass composition represented by Patent Document 1 is known.

[先前技術文獻] [Previous Technical Literature]

[專利文獻] [Patent Literature]

專利文獻1:日本特開2011-178571號公報。 Patent Document 1: Japanese Laid-Open Patent Publication No. 2011-178571.

然而,專利文獻1所記載之玻璃,為了促進高折射率高色散化,GeO2成分、Nb2O5成分及Ta2O5成分等材料單價高的成分的含量較多,有生產成本變高這樣的問題存在。因此,期望出現一種不僅具有高折射率/高色散,且表示分光透過率5%之波長(λ5)短,生產成本低的光學玻璃。 However, in order to promote high refractive index and high dispersion, the glass described in Patent Document 1 has a high content of components such as a GeO 2 component, a Nb 2 O 5 component, and a Ta 2 O 5 component, and has a high production cost. This kind of problem exists. Therefore, it is desired to have an optical glass which has not only a high refractive index/high dispersion but also a wavelength (λ 5 ) indicating a spectral transmittance of 5% and a low production cost.

有鑑於上述的問題點,本發明之目的在於提供一種具有高折射率及表示分光透過率5%之波長(λ5)短,且生產成本低的光學玻璃,以及使用該光學玻璃之預成形體與光學元件。 In view of the above problems, an object of the present invention is to provide an optical glass having a high refractive index and a wavelength (λ 5 ) indicating a spectral transmittance of 5%, and having a low production cost, and a preform using the optical glass. With optical components.

本發明人等,為了解決上述課題,專注累積試驗研究的結果,發現藉由一邊併用La2O3成分、TiO2成分、及BaO成分,一邊調整SiO2成分與B2O3成分的合計量,或是TiO2/(TiO2+BaO)的質量比,可獲得期望的高折射率及高色散,並降低生產成本,且表示分光透過率5%之波長(λ5)變短,遂完成本發明。 In order to solve the above problems, the inventors of the present invention have focused on the results of the cumulative test and found that the total amount of the SiO 2 component and the B 2 O 3 component is adjusted by using the La 2 O 3 component, the TiO 2 component, and the BaO component in combination. Or the mass ratio of TiO 2 /(TiO 2 +BaO), the desired high refractive index and high dispersion can be obtained, and the production cost is lowered, and the wavelength (λ 5 ) indicating that the spectral transmittance is 5% becomes short, and the completion is completed. this invention.

具體而言,本發明提供下述之物。 Specifically, the present invention provides the following.

(1)一種光學玻璃,其中,以氧化物基準的質量%計,含有La2O3成分大於0%至45.0%、TiO2成分大於0%至45.0%、及BaO成分大於0%至40.0%;並含有SiO2成分與B2O3成分的合計量是5.0%以上30.0%以下;TiO2/(TiO2+BaO)的質量比是0.10以上0.90以下;折射率(nd)是1.90以上,阿貝數(νd)是30.0以下,且表示分光透過率5%之波長(λ5)為400nm以下。 (1) An optical glass comprising, by mass% of the oxide, more than 0% to 45.0% of the La 2 O 3 component, more than 0% to 45.0% of the TiO 2 component, and more than 0% to 40.0% of the BaO component. And the total amount of the SiO 2 component and the B 2 O 3 component is 5.0% or more and 30.0% or less; the mass ratio of TiO 2 /(TiO 2 +BaO) is 0.10 or more and 0.90 or less; and the refractive index (n d ) is 1.90 or more. The Abbe number (ν d ) is 30.0 or less, and the wavelength (λ 5 ) indicating that the spectral transmittance is 5% is 400 nm or less.

(2)如(1)所述之光學玻璃,其中以氧化物基準的質量% 計,SiO2成分是0%至30.0%,及B2O3成分是0%至30.0%。 (2) The optical glass according to (1), wherein the SiO 2 component is 0% to 30.0% by mass based on the oxide, and the B 2 O 3 component is 0% to 30.0%.

(3)如(1)或(2)所述之光學玻璃,其中以氧化物基準的質量%計,ZnO成分是0%至20.0%,Y2O3是0%至15.0%,Nb2O5成分是0%至25.0%,Yb2O3成分是0%至15.0%,及Gd2O3成分是0%至15.0%。 (3) The optical glass according to (1) or (2), wherein the ZnO component is 0% to 20.0% by mass based on the oxide, and the Y 2 O 3 is 0% to 15.0%, Nb 2 O The 5 component is 0% to 25.0%, the Yb 2 O 3 component is 0% to 15.0%, and the Gd 2 O 3 component is 0% to 15.0%.

(4)如(1)至(3)中任一項之光學玻璃,其中以氧化物基準的質量%計,(La2O3+Nb2O5+Gd2O3+Yb2O3)的質量和是大於0%且60.0%以下。 (4) The optical glass according to any one of (1) to (3), wherein (La 2 O 3 + Nb 2 O 5 + Gd 2 O 3 + Yb 2 O 3 ) based on the mass % of the oxide The sum of the masses is greater than 0% and less than 60.0%.

(5)如(1)至(4)中任一項之光學玻璃,其中以氧化物基準的質量%計,Ln2O3成分(式中,Ln是選自La、Gd、Y、Yb所成群組中的1種以上)的合計量是大於0%且50.0%以下。 (5) The optical glass according to any one of (1) to (4), wherein the Ln 2 O 3 component (wherein Ln is selected from the group consisting of La, Gd, Y, Yb) The total amount of one or more of the groups is greater than 0% and 50.0% or less.

(6)如(1)至(5)中任一項之光學玻璃,以氧化物基準計,TiO2/BaO的質量比是大於0且3.00以下。 (6) The optical glass according to any one of (1) to (5), wherein the mass ratio of TiO 2 /BaO is more than 0 and 3.00 or less on the basis of the oxide.

(7)如(1)至(6)中任一項之光學玻璃,其中以氧化物基準的質量%計,Rn2O成分(式中,Rn是選自Li、Na、K所成群組中的1種以上)的質量和是15.0%以下。 (7) The optical glass according to any one of (1) to (6) wherein, in the mass % of the oxide, the Rn 2 O component (wherein Rn is selected from the group consisting of Li, Na, and K) The mass sum of one or more of them is 15.0% or less.

(8)如(1)至(7)中任一項之光學玻璃,其中以氧化物基準的質量%計,RO成分(式中,R是選自Mg、Ca、Sr、Ba、Zn所成群組中的1種以上)的質量和是大於0%且35.0%以下。 (8) The optical glass according to any one of (1) to (7), wherein, in the mass % of the oxide, the RO component (wherein R is selected from the group consisting of Mg, Ca, Sr, Ba, and Zn) The mass sum of one or more types in the group is greater than 0% and 35.0% or less.

(9)如(1)至(8)中任一項之光學玻璃,其中以氧化物基準的質量%計,其含有ZrO2成分0%至20.0%、Nb2O5成分0% 至15.0%、WO3成分0%至10.0%、Ta2O5成分0%至10.0%、MgO成分0%至15.0%、CaO成分0%至15.0%、SrO成分0%至15.0%、Li2O成分0%至15.0%、Na2O成分0%至15.0%、K2O成分0%至15.0%、P2O5成分0%至10.0%、GeO2成分0%至10.0%、Al2O3成分0%至15.0%、Ga2O3成分0%至15.0%、Bi2O3成分0%至10.0%、TeO2成分0%至10.0%、SnO2成分0%至3.0%、及Sb2O3成分0%至1.0%。 (9) The optical glass according to any one of (1) to (8), wherein the mass % of the oxide is 0% to 20.0% of the ZrO 2 component, and 0% to 15.0% of the Nb 2 O 5 component. 0% to 10.0% of WO 3 component, 0% to 10.0% of Ta 2 O 5 component, 0% to 15.0% of MgO component, 0% to 15.0% of CaO component, 0% to 15.0% of SrO component, and 0 component of Li 2 O % to 15.0%, Na 2 O component 0% to 15.0%, K 2 O component 0% to 15.0%, P 2 O 5 component 0% to 10.0%, GeO 2 component 0% to 10.0%, Al 2 O 3 component 0% to 15.0%, Ga 2 O 3 component 0% to 15.0%, Bi 2 O 3 component 0% to 10.0%, TeO 2 component 0% to 10.0%, SnO 2 component 0% to 3.0%, and Sb 2 O 3 ingredients 0% to 1.0%.

(10)一種預成形體,由(1)至(9)中任一項之光學玻璃而成。 (10) A preform obtained from the optical glass of any one of (1) to (9).

(11)一種光學元件,由(1)至(9)中任一項之光學玻璃而成。 (11) An optical element comprising the optical glass of any one of (1) to (9).

(12)一種光學機器,具備如(11)所述之光學元件。 (12) An optical device comprising the optical element according to (11).

根據本發明,能夠提供一種不僅具有高折射率,且表示分光透過率5%之波長(λ5)短,生產成本低的光學玻璃,以及使用該光學玻璃之預成形體與光學元件。 According to the present invention, it is possible to provide an optical glass which has not only a high refractive index but also a wavelength (λ 5 ) indicating a spectral transmittance of 5% and a low production cost, and a preform and an optical element using the optical glass.

圖1係以部分色散比(θg,F)為縱軸,阿貝數(νd)為橫軸的直角座標所表示的法線之示意圖。 Fig. 1 is a schematic diagram showing a normal line represented by a rectangular coordinate with a partial dispersion ratio (θg, F) as a vertical axis and an Abbe number (ν d ) as a horizontal axis.

圖2係本發明實施例玻璃的部分色散比(θg,F)與阿貝數(νd)關係之示意圖。 2 is a schematic view showing the relationship between the partial dispersion ratio (θg, F) and the Abbe number (ν d ) of the glass of the embodiment of the present invention.

本發明的光學玻璃,以質量%計,含有La2O3成分大於 0%至45.0%、TiO2成分大於0%至45.0%、及BaO成分大於0%至40.0%;SiO2成分與B2O3成分的合計量是5.0%以上30.0%以下;TiO2/(TiO2+BaO)的質量比是0.10以上0.90以下;折射率(nd)是1.90以上,阿貝數(νd)是30.0以下,且表示分光透過率5%之波長(λ5)為400nm以下。 The optical glass of the present invention contains, by mass%, more than 0% to 45.0% of the La 2 O 3 component, more than 0% to 45.0% of the TiO 2 component, and more than 0% to 40.0% of the BaO component; the SiO 2 component and the B 2 component The total amount of the O 3 component is 5.0% or more and 30.0% or less; the mass ratio of TiO 2 /(TiO 2 +BaO) is 0.10 or more and 0.90 or less; the refractive index (n d ) is 1.90 or more, and the Abbe number (ν d ) is 30.0 or less, and the wavelength (λ 5 ) which shows the spectral transmittance of 5% is 400 nm or less.

根據本發明,藉由一邊併用La2O3成分、TiO2成分、及BaO成分,一邊調整各成分的含量,可期望玻璃的高折射率及高色散化,並提高玻璃的安定性。因此,能夠提供一種不僅具有高折射率及高色散,且表示分光透過率5%之波長(λ5)短,生產成本低的光學玻璃,以及使用該光學玻璃之預成形體與光學元件。 According to the present invention, by adjusting the content of each component by using the La 2 O 3 component, the TiO 2 component, and the BaO component in combination, high refractive index and high dispersion of the glass can be expected, and the stability of the glass can be improved. Therefore, it is possible to provide an optical glass which has a high refractive index and a high dispersion and which has a short wavelength (λ 5 ) indicating a spectral transmittance of 5% and a low production cost, and a preform and an optical element using the optical glass.

[玻璃成分] [Glass composition]

構成本發明之光學玻璃的各成分的組成範圍如下所述。本說明書中,各成分的含量在未特別否定時,皆是以相對於氧化物基準的玻璃全質量之質量%來表示。在此,「氧化物基準」是指,假設作為本發明的玻璃組成成分原料所使用的氧化物、複合鹽、金屬氟化物等在熔融時,全部分解變成氧化物的情況下,將該氧化物的總質量設為100質量%,來表示玻璃中所含有的各種成分之組成。 The composition range of each component constituting the optical glass of the present invention is as follows. In the present specification, the content of each component is expressed by mass% of the total mass of the glass based on the oxide, unless otherwise specified. Here, the "oxide-based" is an oxide, a composite salt, a metal fluoride or the like which is used as a raw material of the glass component of the present invention, and when it is completely decomposed into an oxide during melting, the oxide is used. The total mass is set to 100% by mass to represent the composition of various components contained in the glass.

<關於必須成分、任意成分> <About essential ingredients, optional ingredients>

La2O3成分,是一種可提高玻璃的折射率,減小色散之成分。尤其,藉由含有大於0%的La2O3成分,能夠獲得所期望的高折射率,為一種必須成分。因此,La2O3成分的含量,其下限以大於0%為佳,較佳是3.0%,更佳是15.0%,進而較佳是20.0%,進而更佳是25.0%,再進而更佳是27.0%。 The La 2 O 3 component is a component which increases the refractive index of the glass and reduces the dispersion. In particular, by containing La 2 O 3 component is greater than 0%, it is possible to obtain the desired high refractive index, as a necessary ingredient. Therefore, the content of the La 2 O 3 component is preferably more than 0%, more preferably 3.0%, still more preferably 15.0%, still more preferably 20.0%, still more preferably 25.0%, and still more preferably 27.0%.

另一方面,藉由將La2O3成分的含量設為45.0%以下, 能夠提高玻璃的耐失透性,抑制玻璃的比重增加,且能夠降低生產成本。因此,La2O3成分的含量,其上限以45.0%為佳,較佳是40.0%,更佳是38.0%,進而更佳是37.0%。 On the other hand, when the content of the La 2 O 3 component is 45.0% or less, the devitrification resistance of the glass can be improved, the specific gravity of the glass can be suppressed from increasing, and the production cost can be reduced. Therefore, the upper limit of the content of the La 2 O 3 component is preferably 45.0%, preferably 40.0%, more preferably 38.0%, still more preferably 37.0%.

La2O3成分,可使用La2O3、La(NO3)3‧XH2O(X為任意整數)等作為原料。 As the La 2 O 3 component, La 2 O 3 , La(NO 3 ) 3 ‧XH 2 O (X is an arbitrary integer), or the like can be used as a raw material.

TiO2成分為其含量大於0%時,能夠提高玻璃的折射率,調低阿貝數,提高部分色散比,且能夠提高耐失透性的必須成分。因此,TiO2成分的含量,其下限以大於0%為佳,較佳是5.0%,更佳是10.0%,進而較佳是15.0%,進而更佳是18.0%,再進而更佳是大於20.0%。 When the content of the TiO 2 component is more than 0%, the refractive index of the glass can be increased, the Abbe number can be lowered, the partial dispersion ratio can be increased, and an essential component for devitrification resistance can be improved. Therefore, the lower limit of the content of the TiO 2 component is preferably more than 0%, more preferably 5.0%, still more preferably 10.0%, still more preferably 15.0%, still more preferably 18.0%, and still more preferably more than 20.0. %.

另一方面,藉由將TiO2成分的含量設為45.0%以下,可減少玻璃的著色並提高可見光穿透率。此外,亦能夠抑制因含有過剩的TiO2成分而引起的失透。因此,TiO2成分的含量,其上限以45.0%為佳,較佳是38.0%,更佳是32.0%,進而更佳是27.0%,再進而更佳是25.0%。 On the other hand, by setting the content of the TiO 2 component to 45.0% or less, the coloration of the glass can be reduced and the visible light transmittance can be improved. Further, it is also possible to suppress devitrification caused by the excessive TiO 2 component. Therefore, the upper limit of the content of the TiO 2 component is preferably 45.0%, preferably 38.0%, more preferably 32.0%, still more preferably 27.0%, and still more preferably 25.0%.

TiO2成分,可使用TiO2等作為原料。 As the TiO 2 component, TiO 2 or the like can be used as a raw material.

BaO成分為其含量大於0%時,能夠提高玻璃的折射率或耐失透性,且能夠提高玻璃原料的熔融性的必須成分。因此,BaO成分的含量,其下限以大於0%為佳,較佳是5.0%,更佳是8.0%,進而更佳是10.0%。 When the BaO component is more than 0%, the refractive index or devitrification resistance of the glass can be increased, and an essential component of the meltability of the glass raw material can be improved. Therefore, the content of the BaO component is preferably more than 0%, more preferably 5.0%, still more preferably 8.0%, still more preferably 10.0%.

另一方面,藉由將BaO成分的含量設為40.0%以下,不易降低玻璃的折射率,且能夠減少玻璃的失透。因此,BaO成分的含量,其上限以40.0%為佳,較佳是35.0%,更佳是28.0%,進而更佳是23.0%,再進而更佳是20.0%。 On the other hand, by setting the content of the BaO component to 40.0% or less, it is difficult to lower the refractive index of the glass, and the devitrification of the glass can be reduced. Therefore, the upper limit of the content of the BaO component is preferably 40.0%, more preferably 35.0%, still more preferably 28.0%, still more preferably 23.0%, still more preferably 20.0%.

BaO成分,可使用BaCO3、Ba(NO3)2等作為原料。 As the BaO component, BaCO 3 , Ba(NO 3 ) 2 or the like can be used as a raw material.

B2O3成分與SiO2成分的含量之和(質量和),較佳是5.0% 以上,30.0%以下。 The sum (mass sum) of the content of the B 2 O 3 component and the SiO 2 component is preferably 5.0% or more and 30.0% or less.

特別是,藉由將該和設為5.0%以上,可抑制因B2O3成分或SiO2成分的不足而引起的耐失透性低下。因此,質量和(B2O3+SiO2),其下限以5.0%為佳,較佳是7.0%,更佳是9.0%。 In particular, by setting the sum to 5.0% or more, deterioration of devitrification resistance due to deficiency of the B 2 O 3 component or the SiO 2 component can be suppressed. Therefore, the lower limit of the mass and (B 2 O 3 + SiO 2 ) is preferably 5.0%, preferably 7.0%, more preferably 9.0%.

另一方面,藉由將該和設為30.0%以下,能夠抑制因含有過剩的該等成分而引起的折射率低下,故能夠輕易獲得所期望的高折射率。因此,質量和(B2O3+SiO2),其上限以30.0%為佳,較佳是23.0%,更佳是18.0%,進而更佳是16.50%。 On the other hand, by setting the sum to 30.0% or less, it is possible to suppress a decrease in the refractive index due to the excessive inclusion of the components, so that a desired high refractive index can be easily obtained. Therefore, the upper limit of the mass and (B 2 O 3 + SiO 2 ) is preferably 30.0%, preferably 23.0%, more preferably 18.0%, and still more preferably 16.50%.

在此,TiO2成分的含量與TiO2成分及BaO成分的含量之和的比率(質量比),以0.10以上為佳。藉此,除了能夠維持高折射率與高色散之外,亦能夠獲得高部分色散比。因此,質量比TiO2/(TiO2+BaO),其下限以0.10為佳,較佳是0.30,更佳是0.40,進而更佳是0.45。 In this case, the content of the second component and the content of the component BaO and TiO 2 and TiO component ratio (mass ratio), preferably to 0.10 or more. Thereby, in addition to maintaining a high refractive index and high dispersion, a high partial dispersion ratio can be obtained. Therefore, the mass ratio of TiO 2 /(TiO 2 +BaO) has a lower limit of preferably 0.10, preferably 0.30, more preferably 0.40, and still more preferably 0.45.

另一方面,藉由將該質量比設為0.90以下,可減少玻璃的著色並提高可見光穿透率,且能夠抑制失透。因此,質量比TiO2/(TiO2+BaO),其上限以0.90為佳,較佳是0.80,更佳是0.73,進而更佳是0.68。 On the other hand, by setting the mass ratio to 0.90 or less, the coloration of the glass can be reduced, the visible light transmittance can be improved, and devitrification can be suppressed. Therefore, the mass ratio of TiO 2 /(TiO 2 +BaO) has an upper limit of preferably 0.90, preferably 0.80, more preferably 0.73, still more preferably 0.68.

SiO2成分為其含量大於0%時,能夠提高耐失透性的任意成分。因此,SiO2成分的含量,其下限以大於0%為佳,較佳是大於0.5%,更佳是大於1.0%,進而更佳是大於2.0%。 When the content of the SiO 2 component is more than 0%, an optional component which is resistant to devitrification can be improved. Therefore, the lower limit of the content of the SiO 2 component is preferably more than 0%, more preferably more than 0.5%, still more preferably more than 1.0%, and still more preferably more than 2.0%.

另一方面,藉由將SiO2成分的含量設為30.0%以下,可使SiO2成分在熔融玻璃中容易熔融,免去以高溫進行熔解。SiO2成分的含量,其上限以30.0%為佳,較佳是23.0%,更佳是16.0%,進而更佳是11.0%,再進而更佳是9.0%。 On the other hand, by setting the content of the SiO 2 component to 30.0% or less, the SiO 2 component can be easily melted in the molten glass, and the melting can be prevented at a high temperature. The content of the SiO 2 component is preferably 30.0%, more preferably 23.0%, still more preferably 16.0%, still more preferably 11.0%, still more preferably 9.0%.

SiO2成分,可使用SiO2、K2SiF6、Na2SiF6等作為原料。 As the SiO 2 component, SiO 2 , K 2 SiF 6 , Na 2 SiF 6 or the like can be used as a raw material.

B2O3成分為其含量大於0%時,能夠在玻璃的內部形成網狀結構,促進安定的玻璃形成,提高耐失透性的任意成分。因此,B2O3成分的含量,其下限以大於0%為佳,較佳是大於0.5%,更佳是大於1.0%,進而更佳是大於2.0%。 When the content of the B 2 O 3 component is more than 0%, a network structure can be formed in the glass to promote the formation of a stable glass, and an optional component which is resistant to devitrification can be improved. Therefore, the lower limit of the content of the B 2 O 3 component is preferably more than 0%, more preferably more than 0.5%, still more preferably more than 1.0%, and still more preferably more than 2.0%.

另一方面,藉由將B2O3成分的含量設為30.0%以下,能夠抑制折射率的低下,可使阿貝數變小,且能夠抑制化學耐久性的惡化。因此,B2O3成分的含量,其上限以30.0%以下為佳,較佳是20.0%,更佳是低於15.0%,進而更佳是12.0%,再進而更佳是低於10.0%。 On the other hand, when the content of the B 2 O 3 component is 30.0% or less, the decrease in the refractive index can be suppressed, the Abbe number can be made small, and the deterioration of chemical durability can be suppressed. Therefore, the upper limit of the content of the B 2 O 3 component is preferably 30.0% or less, more preferably 20.0%, still more preferably less than 15.0%, still more preferably 12.0%, still more preferably less than 10.0%.

B2O3成分,可使用H3BO3、Na2B4O7、Na2B4O7‧10H2O、BPO4等作為原料。 As the B 2 O 3 component, H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 ‧10H 2 O, BPO 4 or the like can be used as a raw material.

ZnO成分為其含量大於0%時,能夠改善玻璃的熔融性,並能夠降低玻璃轉移點,且可減少失透的任意成分。因此,ZnO成分的含量,其下限以大於0%為佳,較佳是大於0.5%,更佳是大於1.0%,進而更佳是大於1.5%。 When the content of the ZnO component is more than 0%, the meltability of the glass can be improved, the glass transition point can be lowered, and any component devitrified can be reduced. Therefore, the lower limit of the content of the ZnO component is preferably more than 0%, more preferably more than 0.5%, still more preferably more than 1.0%, and still more preferably more than 1.5%.

另一方面,藉由將ZnO成分的含量設為20.0%以下,能夠降低折射率的低下或失透。此外,由於藉此可提高熔融玻璃的黏性,而能夠減少玻璃的條紋發生。因此,ZnO成分的含量,其上限以20.0%為佳,較佳是15.0%,更佳是11.0%,進而更佳是8.0%。 On the other hand, by setting the content of the ZnO component to 20.0% or less, the refractive index can be lowered or devitrified. Further, since the viscosity of the molten glass can be improved by this, the occurrence of streaking of the glass can be reduced. Therefore, the upper limit of the content of the ZnO component is preferably 20.0%, preferably 15.0%, more preferably 11.0%, still more preferably 8.0%.

ZnO成分,可使用ZnO、ZnF2等作為原料。 As the ZnO component, ZnO, ZnF 2 or the like can be used as a raw material.

Y2O3成分為其含量大於0%時,可抑制玻璃的材料成本上升的任意成分。 When the content of the Y 2 O 3 component is more than 0%, an arbitrary component which can suppress an increase in the material cost of the glass can be suppressed.

藉由將Y2O3成分的含量設為15.0%以下,能夠抑制玻璃的折射率低下,可使阿貝數變小,且能夠提高玻璃的耐 失透性。因此,Y2O3成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 By setting the content of the Y 2 O 3 component to 15.0% or less, it is possible to suppress the decrease in the refractive index of the glass, to reduce the Abbe number, and to improve the devitrification resistance of the glass. Therefore, the upper limit of the content of the Y 2 O 3 component is preferably 15.0%, preferably 10.0%, more preferably 5.0%.

Y2O3成分,可使用Y2O3、YF3等作為原料。 As the Y 2 O 3 component, Y 2 O 3 , YF 3 or the like can be used as a raw material.

Nb2O5成分為其含量大於0%時,能夠提高玻璃的折射率,且能夠提高耐失透性的任意成分。因此,Nb2O5成分的含量,其下限以大於0%為佳,較佳是2.0%,更佳是4.0%。 When the content of the Nb 2 O 5 component is more than 0%, the refractive index of the glass can be increased, and an optional component which is resistant to devitrification can be improved. Therefore, the content of the Nb 2 O 5 component is preferably more than 0%, more preferably 2.0%, still more preferably 4.0%.

另一方面,藉由將Nb2O5成分的含量設為25.0%以下,能夠抑制因含有過剩的Nb2O5而引起的玻璃耐失透性低下,或是能夠抑制可見光的穿透率低下,且可抑制玻璃的材料成本上升。因此,Nb2O5成分的含量,其上限以25.0%為佳,較佳是20.0%,更佳是16.0%,進而更佳是13.0%。 On the other hand, by setting the content of the Nb 2 O 5 component to 25.0% or less, it is possible to suppress the deterioration of the glass devitrification resistance due to the excessive Nb 2 O 5 or to suppress the low transmittance of visible light. And can suppress the increase in the material cost of the glass. Therefore, the upper limit of the content of the Nb 2 O 5 component is preferably 25.0%, preferably 20.0%, more preferably 16.0%, still more preferably 13.0%.

Nb2O5成分,可使用Nb2O5等作為原料。 As the Nb 2 O 5 component, Nb 2 O 5 or the like can be used as a raw material.

Yb2O3成分為其含量大於0%時,可提高玻璃的折射率的任意成分。 When the content of the Yb 2 O 3 component is more than 0%, an arbitrary component of the refractive index of the glass can be increased.

另一方面,藉由將Yb2O3成分的含量設為15.0%以下,能夠提高玻璃的耐失透性,且可使阿貝數變小。因此,Yb2O3成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 On the other hand, by setting the content of the Yb 2 O 3 component to 15.0% or less, the devitrification resistance of the glass can be improved, and the Abbe number can be made small. Thus, Yb 2 O 3 content of the composition, preferably the upper limit to 15.0%, preferably 10.0%, more preferably 5.0%.

Yb2O3成分,可使用Yb2O3等作為原料。 As the Yb 2 O 3 component, Yb 2 O 3 or the like can be used as a raw material.

Gd2O3成分為其含量大於0%時,可提高玻璃的折射率,且能夠提高阿貝數的任意成分。 When the content of the Gd 2 O 3 component is more than 0%, the refractive index of the glass can be increased, and an arbitrary component of the Abbe number can be increased.

另一方面,藉由將稀土類元素中特別高價的Gd2O3成分降低至15.0%以下,可降低玻璃的材料成本,故能夠製作出價格更加低廉的光學玻璃。此外,藉此能夠使玻璃的阿貝數不至於上升至大於所需。因此,Gd2O3成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 On the other hand, by reducing the particularly expensive Gd 2 O 3 component of the rare earth element to 15.0% or less, the material cost of the glass can be reduced, so that an optical glass having a lower cost can be produced. In addition, the Abbe number of the glass can be prevented from rising to more than necessary. Therefore, the upper limit of the content of the Gd 2 O 3 component is preferably 15.0%, preferably 10.0%, more preferably 5.0%.

Gd2O3成分,可使用Gd2O3、GdF3等作為原料。 As the Gd 2 O 3 component, Gd 2 O 3 , GdF 3 or the like can be used as a raw material.

此外,本發明的光學玻璃中,La2O3成分、Nb2O5成分、Gd2O3成分、及Yb2O3成分的含量之和(質量和),以60.0%以下為佳。藉此,能夠降低該等高價成分的含量,故能夠抑制玻璃的材料成本,且可使阿貝數變小。因此,質量和(La2O3+Nb2O5+Gd2O3+Yb2O3),其上限以60.0%為佳,較佳是57.0%,更佳是53.0%,進而更佳是49.0%,再進而更佳是47.0%。 Further, in the optical glass of the present invention, the sum (mass sum) of the contents of the La 2 O 3 component, the Nb 2 O 5 component, the Gd 2 O 3 component, and the Yb 2 O 3 component is preferably 60.0% or less. Thereby, since the content of these high-priced components can be reduced, the material cost of glass can be suppressed, and the Abbe number can be made small. Therefore, the upper limit of the mass and (La 2 O 3 + Nb 2 O 5 + Gd 2 O 3 + Yb 2 O 3 ) is preferably 60.0%, preferably 57.0%, more preferably 53.0%, and still more preferably 49.0%, and even more preferably 47.0%.

另一方面,藉由含有大於0%的該等成分的質量和,可獲得所期望的高折射率。因此,其下限以大於0%為佳,較佳是10.0%,更佳是20.0%,更較佳是25.0%,進而更佳是30.0%,再進而更佳是35.0%。 On the other hand, the desired high refractive index can be obtained by containing a mass sum of the components greater than 0%. Therefore, the lower limit is preferably more than 0%, preferably 10.0%, more preferably 20.0%, still more preferably 25.0%, still more preferably 30.0%, and still more preferably 35.0%.

Ln2O3成分(式中,Ln是選自La、Gd、Y、Yb所成群組中的1種以上)的含量之和(質量和),以大於0%至50%為佳。 The sum (mass sum) of the content of the Ln 2 O 3 component (wherein Ln is one or more selected from the group consisting of La, Gd, Y, and Yb) is preferably from 0% to 50%.

特別是,藉由將該質量和設為大於0%,可提高玻璃的折射率,因此能夠輕易獲得高折射率的玻璃。此外,藉此可減少玻璃的著色。因此,Ln2O3成分的含量之質量和,其下限以大於0%為佳,較佳是1.0%,更佳是3.0%,進而更佳是5.0%。 In particular, by setting the mass sum to be greater than 0%, the refractive index of the glass can be increased, so that a glass having a high refractive index can be easily obtained. In addition, the color of the glass can be reduced by this. Therefore, the lower limit of the content of the Ln 2 O 3 component is preferably more than 0%, more preferably 1.0%, still more preferably 3.0%, still more preferably 5.0%.

另一方面,藉由將該質量和設為50.0%以下,可提高耐失透性,且可使阿貝數變小。因此,Ln2O3成分的含量之質量和,其上限以50.0%為佳,較佳是低於40.0%,更佳是30.0%,進而更佳是25.0%。 On the other hand, by setting the mass sum to 50.0% or less, the devitrification resistance can be improved and the Abbe number can be made small. Therefore, the upper limit of the content of the Ln 2 O 3 component is preferably 50.0%, preferably less than 40.0%, more preferably 30.0%, still more preferably 25.0%.

在此,TiO2成分的含量與La2O3成分、Nb2O5成分、Gd2O3成分、及Yb2O3成分的含量之和的比率(質量比),以大於0 為佳。藉此,除了能夠維持高折射率與高色散之外,亦能夠獲得高部分色散比,且可使生產成本低廉。因此,質量比TiO2/(La2O3+Nb2O5+Gd2O3+Yb2O3),其下限以大於0為佳,較佳是0.10,更佳是0.20,進而更佳是0.40。 Here, the ratio (mass ratio) of the content of the TiO 2 component to the sum of the contents of the La 2 O 3 component, the Nb 2 O 5 component, the Gd 2 O 3 component, and the Yb 2 O 3 component is preferably greater than 0. Thereby, in addition to maintaining high refractive index and high dispersion, a high partial dispersion ratio can be obtained, and production cost can be made low. Therefore, the mass ratio TiO 2 /(La 2 O 3 +Nb 2 O 5 +Gd 2 O 3 +Yb 2 O 3 ) has a lower limit of more than 0, preferably 0.10, more preferably 0.20, and thus more preferably Is 0.40.

另一方面,藉由將該質量比設為2.00以下,可減少玻璃的著色並提高可見光穿透率,且能夠抑制失透。因此,質量比TiO2/(La2O3+Nb2O5+Gd2O3+Yb2O3),其上限以2.00為佳,較佳是1.00,更佳是0.80,進而更佳是0.66。 On the other hand, by setting the mass ratio to 2.00 or less, the coloration of the glass can be reduced, the visible light transmittance can be improved, and devitrification can be suppressed. Therefore, the mass ratio of TiO 2 /(La 2 O 3 +Nb 2 O 5 +Gd 2 O 3 +Yb 2 O 3 ) has an upper limit of 2.00, preferably 1.00, more preferably 0.80, and still more preferably 0.66.

在此,TiO2成分的含量與BaO成分的含量的比率(質量比),以大於0為佳。藉此,除了能夠維持高折射率與高色散之外,亦能夠獲得高部分色散比。質量比TiO2/BaO,其下限以大於0為佳,較佳是0.10,更佳是0.40,進而更佳是0.60。 Here, the ratio (mass ratio) of the content of the TiO 2 component to the content of the BaO component is preferably greater than zero. Thereby, in addition to maintaining a high refractive index and high dispersion, a high partial dispersion ratio can be obtained. The mass ratio TiO 2 /BaO has a lower limit of more than 0, preferably 0.10, more preferably 0.40, and still more preferably 0.60.

另一方面,藉由將該質量比設為3.00以下,可減少玻璃的著色並提高可見光穿透率,且能夠抑制失透。因此,質量比TiO2/BaO,其上限以3.00為佳,較佳是2.00,更佳是1.60。 On the other hand, by setting the mass ratio to 3.00 or less, the coloring of the glass can be reduced, the visible light transmittance can be improved, and devitrification can be suppressed. Therefore, the mass ratio of TiO 2 /BaO has an upper limit of 3.00, preferably 2.00, more preferably 1.60.

在此,TiO2成分與WO3成分的含量之和與BaO成分的比率(質量比),以大於0為佳。藉此,除了能夠維持高折射率與高色散之外,亦能夠獲得高部分色散比,且能夠提高耐失透性。因此,質量比(TiO2+WO3)/BaO,其下限以大於0為佳,較佳是0.30,更佳是0.60,進而更佳是0.80,再進而更佳是1.00。 Here, the ratio of the sum of the content of the TiO 2 component to the content of the WO 3 component to the BaO component (mass ratio) is preferably greater than zero. Thereby, in addition to maintaining high refractive index and high dispersion, a high partial dispersion ratio can be obtained, and devitrification resistance can be improved. Therefore, the mass ratio (TiO 2 + WO 3 ) / BaO has a lower limit of more than 0, preferably 0.30, more preferably 0.60, still more preferably 0.80, still more preferably 1.00.

另一方面,藉由將該質量比設為3.00以下,可減少玻璃的著色並提高可見光穿透率,且能夠抑制失透。因此,質量比(TiO2+WO3)/BaO,其上限以3.00為佳,較佳是2.50,更佳是1.90。 On the other hand, by setting the mass ratio to 3.00 or less, the coloring of the glass can be reduced, the visible light transmittance can be improved, and devitrification can be suppressed. Therefore, the mass ratio (TiO 2 + WO 3 ) / BaO has an upper limit of 3.00, preferably 2.50, more preferably 1.90.

TiO2成分與Nb2O5成分的含量之和(質量和),以大於0%為佳。藉此,能夠提高玻璃的折射率/色散,且可提高耐失透性。因此,質量和(TiO2+Nb2O5),其下限以大於0%為佳,較佳是大於10.0%,更佳是大於15.0%,進而更佳是大於20.0%,再進而更佳是大於25.0%。 The sum (mass sum) of the content of the TiO 2 component and the Nb 2 O 5 component is preferably greater than 0%. Thereby, the refractive index/dispersion of the glass can be improved, and the devitrification resistance can be improved. Therefore, the mass and (TiO 2 + Nb 2 O 5 ) have a lower limit of more than 0%, preferably more than 10.0%, more preferably more than 15.0%, still more preferably more than 20.0%, and still more preferably More than 25.0%.

另一方面,藉由將該質量和設為60.0%以下,可減少玻璃的著色並提高可見光穿透率,且能夠抑制失透。因此,質量和(TiO2+Nb2O5),其上限以60.0%為佳,較佳是低於50.0%,更佳是45.0%,更較佳是40.0%,進而更佳是35.0%,再進而更佳是33.0%。 On the other hand, by setting the mass sum to 60.0% or less, the coloration of the glass can be reduced, the visible light transmittance can be improved, and devitrification can be suppressed. Therefore, the upper limit of the mass and (TiO 2 + Nb 2 O 5 ) is preferably 60.0%, preferably less than 50.0%, more preferably 45.0%, still more preferably 40.0%, and still more preferably 35.0%. Further preferably, it is 33.0%.

Rn2O成分(式中,Rn是選自Li、Na、K、Cs所成群組中的1種以上)的合計量,以15.0%以下為佳。藉此,能夠抑制玻璃的折射率低下,且能夠提高耐失透性。因此,Rn2O成分的質量和,其上限以15.0%為佳,較佳是10.0%,更佳是低於5.0%,進而更佳是低於1.0%。 The total amount of the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is preferably 15.0% or less. Thereby, it is possible to suppress the decrease in the refractive index of the glass and to improve the devitrification resistance. Therefore, the upper limit of the mass of the Rn 2 O component is preferably 15.0%, preferably 10.0%, more preferably less than 5.0%, still more preferably less than 1.0%.

RO成分(式中,R是選自Mg、Ca、Sr、Ba所成群組中的1種以上)的含量之和(質量和),以35.0%以下為佳。藉此能夠減少因含有過剩的RO成分而引起的失透,且可抑制折射率低下。因此,RO成分的含量的質量和,其上限以35.0%為佳,較佳是30.0%,更佳是27.0%,進而更佳是低於23.0%,再進而更佳是20.0%。 The sum (mass sum) of the content of the RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, and Ba) is preferably 35.0% or less. Thereby, devitrification caused by the excessive RO component can be reduced, and the refractive index can be suppressed from being lowered. Therefore, the upper limit of the content of the RO component is preferably 35.0%, more preferably 30.0%, still more preferably 27.0%, still more preferably less than 23.0%, and still more preferably 20.0%.

另一方面,藉由將該質量和設為大於0%,可提高玻璃原料的熔融性或玻璃的安定性。因此,RO成分的合計含量,其下限以大於0%為佳,較佳是4.0%,更佳是7.0%,進而更佳是大於9.0%。 On the other hand, by setting the mass sum to more than 0%, the meltability of the glass raw material or the stability of the glass can be improved. Therefore, the lower limit of the total content of the RO component is preferably more than 0%, more preferably 4.0%, still more preferably 7.0%, still more preferably more than 9.0%.

ZrO2成分為其含量大於0%時,有助於玻璃的高折射率化及低色散化,且能夠提高玻璃的耐失透性的任意成分。因此,ZrO2成分的含量,其下限以大於0%為佳,較佳是0.5%,更佳是1.0%。 When the content of the ZrO 2 component is more than 0%, it contributes to a high refractive index and a low dispersion of the glass, and an optional component which can improve the devitrification resistance of the glass. Therefore, the lower limit of the content of the ZrO 2 component is preferably more than 0%, preferably 0.5%, more preferably 1.0%.

另一方面,藉由將ZrO2成分設為20.0%以下,能夠抑制因含有過剩的ZrO2成分而引起的玻璃耐失透性低下或阿貝數上升至大於所需的程度。因此,ZrO2成分的含量,其上限以20.0%為佳,較佳是16.0%,更佳是12.0%,進而更佳是9.0%,再進而更佳是低於6.5%。 On the other hand, by setting the ZrO 2 component to 20.0% or less, it is possible to suppress the deterioration of the glass devitrification resistance or the Abbe number due to the excessive ZrO 2 component. Therefore, the upper limit of the content of the ZrO 2 component is preferably 20.0%, preferably 16.0%, more preferably 12.0%, still more preferably 9.0%, and still more preferably less than 6.5%.

ZrO2成分,可使用ZrO2、ZrF4等作為原料。 As the ZrO 2 component, ZrO 2 , ZrF 4 or the like can be used as a raw material.

WO3成分為其含量大於0%時,除了可減少因其他高折射率成分所造成的玻璃著色之外,亦能夠提高折射率,並提高部分色散比,且可提高玻璃的耐失透性的任意成分。此外,WO3成分亦是能夠降低玻璃轉移點的成分。因此,WO3成分的含量,其下限以大於0%為佳,較佳是0.1%,更佳是0.2%,進而更佳是0.3%。 When the content of the WO 3 component is more than 0%, in addition to reducing the coloration of the glass due to other high refractive index components, the refractive index can be increased, the partial dispersion ratio can be increased, and the devitrification resistance of the glass can be improved. Any ingredient. Further, the WO 3 component is also a component capable of lowering the glass transition point. Therefore, the lower limit of the content of the WO 3 component is preferably more than 0%, preferably 0.1%, more preferably 0.2%, still more preferably 0.3%.

另一方面,藉由將WO3成分的含量設為10.0%以下,可減少因WO3成分所造成的玻璃著色,而提高可見光穿透率。因此,WO3成分的含量,其上限以10.0%為佳,較佳是5.0%,更佳是3.0%。 On the other hand, by setting the content of the WO 3 component to 10.0% or less, the glass coloration by the WO 3 component can be reduced, and the visible light transmittance can be improved. Therefore, the upper limit of the content of the WO 3 component is preferably 10.0%, preferably 5.0%, more preferably 3.0%.

WO3成分,可使用WO3等作為原料。 As the WO 3 component, WO 3 or the like can be used as a raw material.

Ta2O5成分為其含量大於0%時,能夠提高玻璃的折射率,且可提高耐失透性的任意成分。 When the content of the Ta 2 O 5 component is more than 0%, the refractive index of the glass can be increased, and an optional component which is resistant to devitrification can be improved.

另一方面,藉由將高價的Ta2O5成分降低至10.0%以下,可降低玻璃的材料成本,故能夠製作出價格更加低廉的光學玻璃。此外,藉由將Ta2O5成分的含量設為10.0%以下,可使原料的熔解溫度變低,減少原料熔解所需的能量,因 此亦能夠降低光學玻璃的製造成本。因此,Ta2O5成分的含量,其上限以10.0%為佳,較佳是8.0%,更佳是5.0%。特別是由製作價格更加低廉的光學玻璃之觀點而言,Ta2O5成分的含量,其上限以4.0%為佳,更佳是3.0%,進而更佳是低於1.0%,最佳是不含有。 On the other hand, by lowering the expensive Ta 2 O 5 component to 10.0% or less, the material cost of the glass can be reduced, so that an optical glass having a lower cost can be produced. In addition, by setting the content of the Ta 2 O 5 component to 10.0% or less, the melting temperature of the raw material can be lowered, and the energy required for melting the raw material can be reduced, so that the production cost of the optical glass can also be reduced. Therefore, the upper limit of the content of the Ta 2 O 5 component is preferably 10.0%, preferably 8.0%, more preferably 5.0%. In particular, from the viewpoint of producing an optical glass having a lower cost, the content of the Ta 2 O 5 component is preferably 4.0%, more preferably 3.0%, still more preferably less than 1.0%, and most preferably no. contain.

Ta2O5成分,可使用Ta2O5等作為原料。 As the Ta 2 O 5 component, Ta 2 O 5 or the like can be used as a raw material.

MgO成分為其含量大於0%時,可提高玻璃原料的熔融性或玻璃的耐失透性的任意成分。 When the content of the MgO component is more than 0%, the meltability of the glass raw material or the devitrification resistance of the glass can be increased.

另一方面,藉由將MgO成分的含量設為15.0%以下,能夠抑制因含有過剩的該等成分而引起的折射率低下或耐失透性低下。因此,MgO成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 On the other hand, by setting the content of the MgO component to 15.0% or less, it is possible to suppress a decrease in refractive index or a decrease in devitrification resistance due to the excessive inclusion of such components. Therefore, the upper limit of the content of the MgO component is preferably 15.0%, preferably 10.0%, more preferably 5.0%.

MgO成分,可使用MgCO3、MgF2等作為原料。 As the MgO component, MgCO 3 , MgF 2 or the like can be used as a raw material.

CaO成分為其含量大於0%時,可提高玻璃的折射率或耐失透性,且能夠提高玻璃原料的熔融性的任意成分。因此CaO成分的含量,其下限以大於0%為佳,較佳是0.5%,更佳是1.5%,進而更佳是3.0%。 When the content of the CaO component is more than 0%, the refractive index or the devitrification resistance of the glass can be increased, and an optional component which can improve the meltability of the glass raw material can be obtained. Therefore, the content of the CaO component is preferably more than 0%, more preferably 0.5%, still more preferably 1.5%, still more preferably 3.0%.

另一方面,藉由將CaO成分的含量設為15.0%以下,不易降低玻璃的折射率,且能夠減少玻璃的失透。因此,CaO成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 On the other hand, by setting the content of the CaO component to 15.0% or less, it is difficult to lower the refractive index of the glass, and the devitrification of the glass can be reduced. Therefore, the upper limit of the content of the CaO component is preferably 15.0%, preferably 10.0%, more preferably 5.0%.

CaO成分,可使用CaCO3、CaF2等作為原料。 As the CaO component, CaCO 3 , CaF 2 or the like can be used as a raw material.

SrO成分為其含量大於0%時,可提高玻璃的折射率或耐失透性,且能夠提高玻璃原料的熔融性的任意成分。因此SrO成分的含量,其下限以大於0%為佳,較佳是0.5%,更佳是1.5%,進而更佳是3.0%。 When the content of the SrO component is more than 0%, the refractive index or the devitrification resistance of the glass can be increased, and any component which can improve the meltability of the glass raw material can be obtained. Therefore, the lower limit of the content of the SrO component is preferably more than 0%, more preferably 0.5%, still more preferably 1.5%, still more preferably 3.0%.

另一方面,藉由將SrO成分的含量設為15.0%以下,不易降低玻璃的折射率,且能夠減少玻璃的失透。因此,SrO成分的含量,其上限以15.0%為佳,較佳是10.0%,更佳是5.0%。 On the other hand, by setting the content of the SrO component to 15.0% or less, it is difficult to lower the refractive index of the glass, and the devitrification of the glass can be reduced. Therefore, the upper limit of the content of the SrO component is preferably 15.0%, preferably 10.0%, more preferably 5.0%.

SrO成分,可使用SrCO3、SrF2作為原料。 As the SrO component, SrCO 3 or SrF 2 can be used as a raw material.

Li2O成分、Na2O成分、及K2O成分為其中至少任一者的含量大於0%時,能夠改善玻璃的熔融性的任意成分。尤其K2O成分亦是能夠更加提高玻璃的部分色散比之成分。 When the Li 2 O component, the Na 2 O component, and the K 2 O component are at least 0% of the content of at least one of them, the component can improve the meltability of the glass. In particular, the K 2 O component is also a component capable of further increasing the partial dispersion ratio of the glass.

另一方面,藉由減少Li2O成分、Na2O成分或K2O成分的含量,可抑制玻璃的折射率低下,且能夠減少失透。特別是藉由減少Li2O成分的含量,可抑制玻璃的部分色散比低下。因此,Li2O成分、Na2O成分及K2O成分之中至少任一者的含量,以15.0%以下為佳,較佳是低於10.0%,更佳是低於5.0%,進而更佳是低於1.0%。 On the other hand, by reducing the content of the Li 2 O component, the Na 2 O component, or the K 2 O component, the refractive index of the glass can be suppressed from being lowered, and devitrification can be reduced. In particular, by reducing the content of the Li 2 O component, it is possible to suppress a partial dispersion ratio of the glass from being lowered. Therefore, the content of at least one of the Li 2 O component, the Na 2 O component and the K 2 O component is preferably 15.0% or less, more preferably less than 10.0%, still more preferably less than 5.0%, and furthermore Good is less than 1.0%.

Li2O成分、Na2O成分及K2O成分,可使用Li2CO3、LiNO3、LiF、Na2CO3、NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6等作為原料。 As the Li 2 O component, the Na 2 O component, and the K 2 O component, Li 2 CO 3 , LiNO 3 , LiF, Na 2 CO 3 , NaNO 3 , NaF, Na 2 SiF 6 , K 2 CO 3 , KNO 3 , or the like can be used. KF, KHF 2 , K 2 SiF 6 and the like are used as raw materials.

P2O5成分為其含量大於0%時,可提高玻璃耐失透性的任意成分。尤其藉由將P2O5成分的含量設為10.0%以下,能夠抑制玻璃的化學耐久性的低下,特別是耐水性的低下。因此,P2O5成分的含量,其上限以10.0%為佳,較佳是5.0%,更佳是3.0%。 When the content of the P 2 O 5 component is more than 0%, the component which is resistant to devitrification of the glass can be improved. In particular, by setting the content of the P 2 O 5 component to 10.0% or less, it is possible to suppress the deterioration of the chemical durability of the glass, in particular, the deterioration of the water resistance. Therefore, the upper limit of the content of the P 2 O 5 component is preferably 10.0%, preferably 5.0%, more preferably 3.0%.

P2O5成分,可使用Al(PO3)3、Ca(PO3)2、Ba(PO3)2、BPO4、H3PO4等作為原料。 As the P 2 O 5 component, Al(PO 3 ) 3 , Ca(PO 3 ) 2 , Ba(PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like can be used as a raw material.

GeO2成分為其含量大於0%時,可提高玻璃的折射率,且能夠提高耐失透性的任意成分。然而,由於GeO2的原料 價格昂貴,若使用量大會造成材料成本變高,而有損藉由減少Gd2O3成分或Ta2O5成分所帶來的成本下降效果。因此,GeO2成分的含量,其上限以10.0%為佳,較佳是5.0%,更佳是1.0%,最佳是不含有。 When the content of the GeO 2 component is more than 0%, the refractive index of the glass can be increased, and an optional component which is resistant to devitrification can be improved. However, since the raw material of GeO 2 is expensive, if the usage amount is high, the material cost becomes high, and the cost reduction effect by reducing the Gd 2 O 3 component or the Ta 2 O 5 component is impaired. Therefore, the content of the GeO 2 component is preferably 10.0%, more preferably 5.0%, still more preferably 1.0%, and most preferably no.

GeO2成分,可使用GeO2等作為原料。 As the GeO 2 component, GeO 2 or the like can be used as a raw material.

Al2O3成分與Ga2O3成分為其含量大於0%時,可提高玻璃的化學耐久性,且能夠提高玻璃的耐失透性的任意成分。 When the content of the Al 2 O 3 component and the Ga 2 O 3 component is more than 0%, the chemical durability of the glass can be improved, and an optional component which is resistant to devitrification of the glass can be improved.

另一方面,藉由將Al2O3成分與Ga2O3成分的含量分別設為15.0%以下,能夠抑制因含有過剩的該等成分而引起的玻璃耐失透性低下。因此,Al2O3成分與Ga2O3成分各別的含量,其上限以15.0%為佳,較佳是8.0%,更佳是3.0%。 On the other hand, by setting the content of the Al 2 O 3 component and the Ga 2 O 3 component to 15.0% or less, it is possible to suppress the deterioration of the glass devitrification resistance due to the excessive content of the components. Therefore, the upper limit of the content of each of the Al 2 O 3 component and the Ga 2 O 3 component is preferably 15.0%, more preferably 8.0%, still more preferably 3.0%.

Al2O3成分與Ga2O3成分,可使用Al2O3、Al(OH)3、AlF3、Ga2O3、Ga(OH)3等作為原料。 As the raw material of the Al 2 O 3 component and the Ga 2 O 3 component, Al 2 O 3 , Al(OH) 3 , AlF 3 , Ga 2 O 3 , Ga(OH) 3 or the like can be used.

Bi2O3成分為其含量大於0%時,可提高折射率,並能夠降低玻璃轉移點的任意成分。 When the content of the Bi 2 O 3 component is more than 0%, the refractive index can be increased, and any component of the glass transition point can be lowered.

另一方面,藉由將Bi2O3成分的含量設為10.0%以下,可提高玻璃的耐失透性,且可減少玻璃的著色而提高可見光穿透率。因此,Bi2O3成分的含量,其上限以10.0%為佳,較佳是5.0%,更佳是3.0%。 On the other hand, by setting the content of the Bi 2 O 3 component to 10.0% or less, the devitrification resistance of the glass can be improved, and the coloration of the glass can be reduced to improve the visible light transmittance. Therefore, the upper limit of the content of the Bi 2 O 3 component is preferably 10.0%, preferably 5.0%, more preferably 3.0%.

Bi2O3成分,可使用Bi2O3等作為原料。 As the Bi 2 O 3 component, Bi 2 O 3 or the like can be used as a raw material.

TeO2成分為其含量大於0%時,可提高折射率,且能夠降低玻璃轉移點的任意成分。 When the content of the TeO 2 component is more than 0%, the refractive index can be increased, and any component of the glass transition point can be lowered.

然而,將玻璃原料置於鉑製的坩堝、或是置於與熔融玻璃接觸的部分是在鉑所形成的熔融槽中進行熔融時,存在著TeO2成分有可能會與鉑合金化的問題。因此,TeO2成 分的含量,其上限以10.0%為佳,較佳是5.0%,更佳是3.0%,進而更佳是不含有。 However, when the glass raw material is placed in a crucible made of platinum or the portion placed in contact with the molten glass is melted in a molten bath formed of platinum, there is a problem that the TeO 2 component may be alloyed with platinum. Therefore, the upper limit of the content of the TeO 2 component is preferably 10.0%, preferably 5.0%, more preferably 3.0%, and even more preferably no.

TeO2成分,可使用TeO2等作為原料。 As the TeO 2 component, TeO 2 or the like can be used as a raw material.

SnO2成分為其含量大於0%時,可降低熔融玻璃的氧化而使熔融玻璃清澈,且不易使玻璃的光線穿透率惡化的任意成分。 When the content of the SnO 2 component is more than 0%, the molten glass can be oxidized to make the molten glass clear, and it is difficult to deteriorate the light transmittance of the glass.

另一方面,藉由將SnO2成分的含量設為3.0%以下,不易發生因熔融玻璃的還原而引起的玻璃著色、或是玻璃失透。此外,由於SnO2成分與熔解設備(特別是Pt等貴金屬)的合金化減少,而可期望熔融設備的使用年限延長。因此,SnO2成分的含量設為3.0%以下為佳,較佳是低於2.0%,更佳是低於1.0%,進而更佳是不含有。 On the other hand, when the content of the SnO 2 component is 3.0% or less, coloring of the glass due to reduction of the molten glass or devitrification of the glass is less likely to occur. Further, since the alloying of the SnO 2 component with the melting device (particularly, a noble metal such as Pt) is reduced, it is expected that the life of the melting device is prolonged. Therefore, the content of the SnO 2 component is preferably 3.0% or less, more preferably less than 2.0%, still more preferably less than 1.0%, and even more preferably no.

SnO2成分,可使用SnO、SnO2、SnF2、SnF4等作為原料。 As the SnO 2 component, SnO, SnO 2 , SnF 2 , SnF 4 or the like can be used as a raw material.

Sb2O3成分為其含量大於0%時,能夠使熔融玻璃消泡的任意成分。 The Sb 2 O 3 component is an optional component capable of defoaming the molten glass when the content thereof is more than 0%.

另一方面,藉由將Sb2O3成分的含量設為1.0%以下,可使得過度的發泡難以發生,且與熔解設備(特別是Pt等貴金屬)的合金化減少。因此,Sb2O3成分的含量設為1.0%以下為佳,較佳是低於0.5%,更佳是低於0.3%,進而更佳是低於0.1%。 On the other hand, by setting the content of the Sb 2 O 3 component to 1.0% or less, excessive foaming is less likely to occur, and alloying with a melting device (particularly, a noble metal such as Pt) is reduced. Therefore, the content of the Sb 2 O 3 component is preferably 1.0% or less, preferably less than 0.5%, more preferably less than 0.3%, still more preferably less than 0.1%.

Sb2O3成分,可使用Sb2O3、Sb2O5、Na2H2Sb2O7‧5H2O等作為原料。 As the Sb 2 O 3 component, Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 ‧5H 2 O or the like can be used as a raw material.

此外,使玻璃澄清並消泡的成分,並不限於上述的Sb2O3成分,可使用玻璃製造的領域中周知的澄清劑、消泡劑或該等的組合。 Further, the component which clarifies and defoams the glass is not limited to the above-mentioned Sb 2 O 3 component, and a clarifier, an antifoaming agent or a combination thereof which is well known in the field of glass production can be used.

F成分為其含量大於0%時,可提高玻璃的阿貝數,降低玻璃轉移點,且能夠提高耐失透性的任意成分。 When the content of the F component is more than 0%, the Abbe number of the glass can be increased, the glass transition point can be lowered, and an optional component which is resistant to devitrification can be improved.

然而,F成分的含量,亦即作為將上述各金屬元素的1種或2種以上的氧化物的一部分或全部置換的氟化物的F之合計量若大於10.0%,會使得F成分的揮發量變多,因此變得難以獲得安定的光學常數,而難以獲得均質的玻璃。此外,阿貝數會上升至大於所需的程度。 However, the content of the F component, that is, the total amount of F which is a fluoride which replaces part or all of one or two or more kinds of oxides of the above-mentioned respective metal elements, is more than 10.0%, and the amount of volatilization of the F component is changed. There are many, so it becomes difficult to obtain a stable optical constant, and it is difficult to obtain a homogeneous glass. In addition, the Abbe number will rise to more than necessary.

因此,F成分的含量設為10.0%以下為佳,較佳是低於5.0%,更佳是低於3.0%,進而更佳是低於1.0%,再進而更佳是不含有。 Therefore, the content of the component F is preferably 10.0% or less, more preferably less than 5.0%, still more preferably less than 3.0%, still more preferably less than 1.0%, and still more preferably not contained.

<關於不應該含有的成分> <About ingredients that should not be included>

接下來,對於本發明的光學玻璃中不應該含有的成分,以及不適合含有的成分進行說明。 Next, the components which should not be contained in the optical glass of the present invention and the components which are not suitable for inclusion will be described.

本發明的光學玻璃中,在不影響本發明的玻璃特性之範圍內,依所需可添加其他成分。但GeO2成分會使得玻璃的色散性提高,實質上不含有為佳。 In the optical glass of the present invention, other components may be added as needed within a range that does not affect the characteristics of the glass of the present invention. However, the GeO 2 component causes the dispersion of the glass to be improved, and it is preferably not contained.

此外,除了Ti、Zr、Nb、W、La、Gd、Y、Yb、Lu的各種過渡金屬成分,例如Hf、V、Cr、Mn、Fe、Co、Ni、Cu、Ag、Mo、Ce、Nd等,具有分別以單獨或是複合型態含有時,即便是少量含有仍會使玻璃著色,吸收可見光區域的特定波長的光這樣的性質,因此,特別是在使用可見光區域的波長的光學玻璃中,實質上不含有為佳。 In addition, various transition metal components other than Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, such as Hf, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Mo, Ce, Nd When it is contained in a single or composite form, even if it contains a small amount of light which will color the glass and absorb light of a specific wavelength in the visible light region, it is especially in the optical glass using the wavelength of the visible light region. It is not really preferable to contain it.

此外,PbO等鉛化合物及As2O3等砷化合物,以及Th、Cd、Tl、Os、Be、Se各成分,近年來,被視為有害的化學物質,而有避免使用的傾向,不僅是在玻璃的製造步驟, 甚至於加工步驟及製品化後的處理,必須有因應環境對策上的處置。因此,在重視環境上的影響的情況下,除了無法避免的混入,實質上不含有該等成分為佳。藉此,使得光學玻璃能夠實質地不含有污染環境的物質。因此,即使不採取特別的環境對策措施,仍能夠製造、加工及廢棄該光學玻璃。 In addition, lead compounds such as PbO and arsenic compounds such as As 2 O 3 and components of Th, Cd, Tl, Os, Be, and Se have been regarded as harmful chemical substances in recent years, and there is a tendency to avoid use, not only In the manufacturing steps of glass, even in the processing steps and after the product is processed, it is necessary to deal with environmental countermeasures. Therefore, in the case where the influence of the environment is emphasized, it is preferable that the components are not substantially contained in addition to the inevitable mixing. Thereby, the optical glass can be made substantially free of substances that pollute the environment. Therefore, the optical glass can be manufactured, processed, and discarded without taking special environmental measures.

[製造方法] [Production method]

本發明的光學玻璃,例如能夠以下述方式加以製作。亦即,使各成分在規定的含量範圍內,將上述原料均勻地混合,再將製作出的混合物放入鉑坩堝、石英坩堝或鋁氧坩堝中進行初步熔融之後,再放入金坩堝、鉑坩堝、鉑合金坩堝、或銥坩堝中,於900℃至1400℃的溫度範圍下花費1小時至5小時進行熔融,攪拌使其均質化並進行消泡等步驟後,降溫至1300℃以下,接著進行最終階段的攪拌以去除條紋,再使用成形模具加以成形,藉此製作而成。在此,作為獲得使用成形模具成形的玻璃之方法,可舉出如將熔融玻璃流入成形模具一端的同時,由成形模具的另一端拉引出已成形的玻璃之方法、或是將熔融玻璃澆鑄於鑄模中,再使其緩冷卻之方法。 The optical glass of the present invention can be produced, for example, in the following manner. That is, the raw materials are uniformly mixed in a predetermined content range, and the produced mixture is placed in a platinum crucible, a quartz crucible or an aluminoxane to be initially melted, and then the platinum and platinum are placed. In a crucible, a platinum alloy crucible, or a crucible, it is melted in a temperature range of 900 ° C to 1400 ° C for 1 hour to 5 hours, stirred to homogenize and defoamed, and then cooled to 1300 ° C or lower, followed by cooling to 1300 ° C or lower. The final stage of stirring is carried out to remove the streaks, and then formed by molding using a molding die. Here, as a method of obtaining the glass formed by using a molding die, a method of drawing the molten glass into the molding die, pulling the drawn glass from the other end of the molding die, or casting the molten glass may be mentioned. In the mold, let it cool down.

[物性] [physical property]

本發明的光學玻璃,以具有高折射率及高色散為佳。 The optical glass of the present invention preferably has a high refractive index and a high dispersion.

特別是,本發明的光學玻璃的折射率(nd),其下限以1.90為佳,較佳是1.95,更佳是1.98。該折射率的上限,以2.20為佳,較佳是2.15以下,更佳亦可為低於2.10。 In particular, the refractive index (n d ) of the optical glass of the present invention has a lower limit of 1.90, preferably 1.95, more preferably 1.98. The upper limit of the refractive index is preferably 2.20, preferably 2.15 or less, more preferably less than 2.10.

此外,本發明的光學玻璃的阿貝數(νd),其下限以15.0為佳,較佳是18.0以上,更佳是20.0以上,而其上限以30.0以下為佳,較佳是28.0以下,更佳是27.0。 Further, the Abbe number (ν d ) of the optical glass of the present invention has a lower limit of preferably 15.0, preferably 18.0 or more, more preferably 20.0 or more, and the upper limit is preferably 30.0 or less, preferably 28.0 or less. More preferably, it is 27.0.

通過具有如此高的折射率,即使期望光學元件的薄型化,亦能夠獲得大的折射量。此外,通過具有如此高的色散,當例如與具有低色散(高阿貝數)的光學元件組合時,能夠實現高成像特性。 By having such a high refractive index, a large amount of refraction can be obtained even if the optical element is desired to be thinned. Further, by having such a high dispersion, high imaging characteristics can be achieved when combined with, for example, an optical element having a low dispersion (high Abbe number).

因此,本發明的光學玻璃,可於光學設計上發揮功效,特別是,除了能夠期望高成像特性等之外,亦能夠實現光學系統的小型化,而使得光學設計上的自由度增加。 Therefore, the optical glass of the present invention can exert an effect on optical design, and in particular, in addition to high imaging characteristics and the like, it is possible to achieve miniaturization of the optical system and increase the degree of freedom in optical design.

本發明的光學玻璃,較佳是可見光穿透率為高,尤其是可見光中短波長方面的光之穿透率為高,藉此,使得著色情況較少。 The optical glass of the present invention preferably has a high visible light transmittance, and particularly has a high light transmittance in terms of short wavelength in visible light, whereby coloring is less.

特別是,本發明的光學玻璃,若以玻璃的穿透率來表示,於厚度為10mm的樣品中表示分光穿透率70%的波長(λ70),其上限以500nm為佳,較佳是490nm,更佳是480nm。 In particular, the optical glass of the present invention, when expressed by the transmittance of glass, represents a wavelength (λ 70 ) having a spectral transmittance of 70% in a sample having a thickness of 10 mm, and the upper limit is preferably 500 nm, more preferably 490 nm, more preferably 480 nm.

此外,本發明的光學玻璃中,於厚度為10mm的樣品中表示分光透過率5%之最短波長(λ5),其上限以400nm為佳,較佳是390nm。 Further, in the optical glass of the present invention, the shortest wavelength (λ 5 ) of the spectral transmittance of 5% is shown in the sample having a thickness of 10 mm, and the upper limit is preferably 400 nm, preferably 390 nm.

由此,玻璃的吸收邊緣變成在紫外光區附近,可提高玻璃對於可見光的透明性,因此,該光學玻璃可適用於如透鏡這種使光穿透的光學元件。 Thereby, the absorption edge of the glass becomes in the vicinity of the ultraviolet light region, and the transparency of the glass to visible light can be improved, and therefore, the optical glass can be applied to an optical element such as a lens that penetrates light.

本發明的光學玻璃,較佳是具有高部分色散比(θg,F)。更具體而言,本發明的光學玻璃的部分色散比(θg,F),其下限以0.570為佳,較佳是0.580,更佳是0.595,進而更佳是0.605,再進而更佳是0.612。 The optical glass of the present invention preferably has a high partial dispersion ratio (θg, F). More specifically, the partial dispersion ratio (θg, F) of the optical glass of the present invention has a lower limit of preferably 0.570, preferably 0.580, more preferably 0.595, still more preferably 0.605, still more preferably 0.612.

此外,本發明的光學玻璃的部分色散比(θg,F),其與阿貝數(νd)的關係,較佳是符合(-0.00162νd+0.645)≦(θg,F)≦(-0.00162νd+0.680)的關係。 Further, the partial dispersion ratio (θg, F) of the optical glass of the present invention, which is related to the Abbe number (ν d ), preferably corresponds to (-0.00162 ν d + 0.645) ≦ (θg, F) ≦ (- 0.00162ν d +0.680) relationship.

藉此,因可獲得部分色散比(θg,F)為小的光學玻璃, 光學玻璃可於降低光學元件的色像差等上發揮作用。 Thereby, an optical glass having a small partial dispersion ratio (θg, F) can be obtained, and the optical glass can function to reduce chromatic aberration of the optical element and the like.

因此,本發明的光學玻璃的部分色散比(θg,F),其下限以(-0.00162νd+0.645)為佳,較佳是(-0.00162νd+0.650)。另一方面,本發明的光學玻璃的部分色散比(θg,F),其上限以(-0.00162νd+0.675)為佳,較佳是(-0.00162νd+0.670)。 Therefore, the partial dispersion ratio (θg, F) of the optical glass of the present invention has a lower limit of (-0.00162 ν d + 0.645), preferably (-0.00162 ν d + 0.650). On the other hand, the partial dispersion ratio (θg, F) of the optical glass of the present invention has an upper limit of (-0.00162 ν d + 0.675), preferably (-0.00162 ν d + 0.670).

上述部分色散比(θg,F)與阿貝數(νd)的關係式,於以部分色散比為縱軸,阿貝數為橫軸的直角座標中,是使用與法線為平行的直線來表示。法線,是表示在以往周知的玻璃的部分色散比(θg,F)與阿貝數(νd)之間所觀察到的線性關係,於採用以部分色散比(θg,F)為縱軸,阿貝數(νd)為橫軸的直角座標上,是藉由將標記NSL7與PBM2的部分色散比以及阿貝數之2點加以連接的直線來表示(請參考第1圖)。再者,以往周知的玻璃的部分色散比與阿貝數的關係,大致上是與法線重複。 The relationship between the partial dispersion ratio (θg, F) and the Abbe number (ν d ) is a straight line in which the partial dispersion ratio is the vertical axis and the Abbe number is the horizontal axis, and a straight line parallel to the normal line is used. To represent. The normal line indicates the linear relationship observed between the partial dispersion ratio (θg, F) and the Abbe number (ν d ) of the conventionally known glass, and the partial dispersion ratio (θg, F) is used as the vertical axis. The Abbe number (ν d ) is a rectangular coordinate of the horizontal axis and is represented by a straight line connecting the partial dispersion ratio of the mark NSL7 and PBM2 and the two points of the Abbe number (refer to Fig. 1). Further, the relationship between the partial dispersion ratio of the conventionally known glass and the Abbe number is substantially the same as the normal.

在此,NSL7與PBM2是小原公司製的光學玻璃,PBM2的阿貝數(νd)是36.3,部分色散比(θg,F)是0.5828,NSL7的阿貝數(νd)是60.5,部分色散比(θg,F)是0.5436。 Here, NSL7 and PBM2 are optical glasses made by Ohara, the Abbe number (ν d ) of PBM2 is 36.3, the partial dispersion ratio (θg, F) is 0.5828, and the Abbe number (ν d ) of NSL7 is 60.5. The dispersion ratio (θg, F) is 0.5436.

[預成形體及光學元件] [Preforms and optical components]

可使用例如研磨加工的方法,或是再熱壓製成形、精密壓製成形等模壓成形的方法,由製成的光學玻璃來製作出玻璃成形體。亦即,能夠以下述列舉之方式製作玻璃成形體:對光學玻璃進行研削及研磨等機械加工來製作玻璃成形體;對由光學玻璃製作的預成形體,進行再熱壓製成形後,再進行研磨加工來製作玻璃成形體;對進行研磨加工來製作的預成形體,或是藉由周知的漂浮成形等所成形的預成形體,進行精密壓製成形,來製作玻璃成形體等。但製作玻璃成形體的方法,並不限於上述。 The glass molded body can be produced from the produced optical glass by, for example, a method of polishing or a method of press molding such as re-press molding or precision press molding. In other words, the glass molded body can be produced by performing mechanical processing such as grinding and polishing on the optical glass to produce a glass molded body, and performing reheating and press molding on the preform made of optical glass. The glass molded body is produced by processing, and the preform which is produced by the polishing process or the preform which is formed by a known floating molding or the like is subjected to precision press molding to produce a glass molded body or the like. However, the method of producing the glass molded body is not limited to the above.

像這樣,由本發明的光學玻璃所形成的玻璃成形體,能夠在各式各樣的光學元件及光學設計上發揮功效,其中特別適合用於透鏡或稜鏡等光學元件。藉由提高玻璃的安定性,可形成口徑大的玻璃成形體,因此,除了能夠期望光學元件的大型化之外,使用於相機或投影機等光學機器時,亦能夠實現高清晰且高精密度的成像特性及投影特性。 As described above, the glass molded body formed of the optical glass of the present invention can exhibit various functions in various optical elements and optical designs, and is particularly suitable for use in optical elements such as lenses and iridium. By improving the stability of the glass, a glass molded body having a large diameter can be formed. Therefore, in addition to the increase in size of the optical element, it is possible to achieve high definition and high precision when used in an optical device such as a camera or a projector. Imaging characteristics and projection characteristics.

[實施例] [Examples]

本發明實施例(No.1至No.52)的玻璃組成,與該等玻璃的折射率(nd)、阿貝數(νd)、穿透率(λ5、λ70)、以及部分色散比(θg,F)的數值皆示於表1至表10。此外,以下的實施例僅作為例示之目的,本發明並不限於該等實施例。 The glass composition of the examples (No. 1 to No. 52) of the present invention, the refractive index (n d ), the Abbe number (ν d ), the transmittance (λ 5 , λ 70 ), and the portions of the glasses The values of the dispersion ratio (θg, F) are shown in Tables 1 to 10. Further, the following examples are for illustrative purposes only, and the invention is not limited to the embodiments.

實施例的玻璃,各成分的原料,皆是選擇與其相符合的氧化物、氫氧化物、碳酸鹽、硝酸鹽、氟化物、氫氧化物、偏燐酸化合物等一般光學玻璃所使用的高純度原料,之後再將該等原料進行秤重並均勻地混合後,放入鉑坩堝,並以溫度設定為1280℃至1340℃範圍的電爐,花費2.5小時來進行玻璃原料的熔解,以及攪拌熔解的玻璃原料使其消泡後,降溫至1180℃ 1250℃,再次進行攪拌使其均質化,接著澆鑄於鑄模中,再加以緩冷卻而製作出玻璃。 The glass of the examples, the raw materials of the respective components, are selected from the high-purity raw materials used for general optical glass such as oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, and bismuth-acid compounds. Then, the raw materials are weighed and uniformly mixed, and then placed in a platinum crucible, and the temperature is set to an electric furnace in the range of 1280 ° C to 1340 ° C, and the melting of the glass raw material is carried out for 2.5 hours, and the molten glass is stirred. After the raw material was defoamed, the temperature was lowered to 1,180 ° C and 1,250 ° C, and the mixture was further stirred and homogenized, and then cast in a mold, and then slowly cooled to prepare a glass.

實施例的玻璃折射率(nd)及阿貝數(νd),是以相對於氦燈的d線(587.56nm)之測定值來表示。此外,阿貝數(νd),是使用上述d線的折射率、相對於氫燈的F線(486.13nm)之折射率(nF)、相對於C線(656.27nm)之折射率(nC)的數值,由阿貝數(νd)=[(nd-1)/(nF-nC)]之數式所計算出。 The refractive index (n d ) and the Abbe number (ν d ) of the glass of the examples are shown as measured values with respect to the d-line (587.56 nm) of the xenon lamp. Further, the Abbe number (ν d ) is a refractive index using the above d line, a refractive index (n F ) with respect to the F line (486.13 nm) of the hydrogen lamp, and a refractive index with respect to the C line (656.27 nm) ( The value of n C ) is calculated from the equation of Abbe number (ν d )=[(n d -1)/(n F -n C )].

部分色散比,是測定C線(波長656.27nm)中的折射率nC、F線(波長486.13nm)中的折射率nF、g線(波長435.835nm)中的折射率ng,再藉由(θg,F)=(ng-nF)/(nF-nC)之數式,計算出該部分色散比。 The partial dispersion ratio is measured by the refractive index n C in the C line (wavelength 656.27 nm), the refractive index n F in the F line (wavelength 486.13 nm), and the refractive index n g in the g line (wavelength 435.835 nm). The partial dispersion ratio is calculated from the equation of (θg, F) = (n g - n F ) / (n F - n C ).

實施例的玻璃的穿透率,是根據日本光學玻璃工業會規格JOGIS02-2003來加以測定。此外,本發明中,藉由測定玻璃的穿透率來求得玻璃有無著色及其著色程度。具體而言,是將厚度為10±0.1mm相對平行的研磨品,根據JISZ8722,測定200nm至800nm的分光穿透率,而求得λ5(穿透率為5%時的波長)及λ70(穿透率為70%時的波長)。 The transmittance of the glass of the examples was measured in accordance with the Japanese Optical Glass Industry Association specification JOGIS02-2003. Further, in the present invention, the presence or absence of coloration of the glass and the degree of coloration thereof are determined by measuring the transmittance of the glass. Specifically, an abrasive product having a thickness of 10 ± 0.1 mm and relatively parallel is used, and a spectral transmittance of 200 nm to 800 nm is measured according to JIS Z8722, and λ 5 (wavelength at a transmittance of 5%) and λ 70 are obtained. (wavelength at a transmittance of 70%).

此外,本測定所使用的玻璃,是使用緩冷卻降溫速度設為-25℃/hr,以緩冷卻爐進行處理之物。 Further, the glass used in the measurement was treated in a slow cooling furnace using a slow cooling rate of -25 ° C / hr.

如表所示,本發明實施例的光學玻璃,不論何者,其折射率(nd)皆為1.90以上,並且,該折射率(nd)亦為2.20以下,更詳細而言是2.10以下,皆在所期望的範圍內。 As shown in the table, the optical glass of the embodiment of the present invention has a refractive index (n d ) of 1.90 or more, and the refractive index (n d ) is also 2.20 or less, and more specifically 2.10 or less. All are within the desired range.

此外,本發明實施例的光學玻璃,不論何者,其阿貝數(νd)皆為30.0以下,更具體而言是28.0以下,並且,該阿貝數(νd)亦為15.0以上,更詳細而言是20.0以上,皆在所期望的範圍內。 Further, in the optical glass of the embodiment of the present invention, the Abbe number (ν d ) is 30.0 or less, more specifically 28.0 or less, and the Abbe number (ν d ) is also 15.0 or more. Specifically, it is 20.0 or more, and it is all within a desired range.

此外,本發明實施例的光學玻璃,λ70(穿透率為70%時的波長)皆為500nm以下,更詳細而言是490nm以下。此外,本發明實施例的光學玻璃,λ5(穿透率為5%時的波長)皆為400nm以下,更詳細而言是390nm以下。 Further, in the optical glass of the embodiment of the invention, λ 70 (wavelength at a transmittance of 70%) is 500 nm or less, and more specifically 490 nm or less. Further, in the optical glass of the embodiment of the present invention, λ 5 (wavelength at a transmittance of 5%) is 400 nm or less, and more specifically 390 nm or less.

此外,本發明實施例的光學玻璃,不論何者,其部分色散比(θg,F)皆為(-0.00162νd+0.645)以上,更詳細而言是(-0.00162νd+0.650)以上。 Further, in the optical glass of the embodiment of the present invention, the partial dispersion ratio (θg, F) is (-0.00162 ν d + 0.645) or more, and more specifically (-0.00162 ν d + 0.650) or more.

與之相反,本發明實施例的光學玻璃的部分色散比為(-0.00162νd+0.680)以下,更詳細而言是(-0.00162νd+0.670)以下。因此可知,該等部分色散比(θg,F)在所期望的範圍內。 In contrast, the partial dispersion ratio of the optical glass of the embodiment of the present invention is (-0.00162 ν d + 0.680) or less, and more specifically (-0.00162 ν d + 0.670) or less. Therefore, it is understood that the partial dispersion ratios (θg, F) are within a desired range.

因此,可清楚得知,本發明實施例的光學玻璃,除了可使折射率及阿貝數在所期望的範圍內之外,亦能夠價格低廉地製作,且可使著色減少。 Therefore, it is clear that the optical glass of the embodiment of the present invention can be produced at a low cost in addition to the refractive index and the Abbe number within a desired range, and the coloring can be reduced.

再者,使用以本發明實施例所獲得的光學玻璃,於進行了再熱壓製成形之後,進行了研削及研磨,加工成透鏡及稜鏡的形狀。此外,使用本發明實施例的光學玻璃,形 成精密壓製成形用預成形體,再將該精密壓製成形用預成形體進行了精密壓製成形。不管是何種情況,加熱軟化後的玻璃不會發生乳白化及失透等問題而能夠安定地加工成各式各樣的透鏡與稜鏡的形狀。 Further, the optical glass obtained in the examples of the present invention was subjected to grinding and polishing after reheat press forming, and processed into a shape of a lens and a crucible. Further, the optical glass of the embodiment of the present invention is used to form a preform for precision press molding, and the preform for precision press molding is precisely press-formed. In any case, the glass which is softened by heating does not cause problems such as opacification and devitrification, and can be stably processed into various lenses and crucible shapes.

以上,雖然以例示之目的詳細地說明了本發明,但本實施例的目的僅止於例示,所屬技術領域中具有通常知識者應可理解,在不偏離本發明的思想及範圍的情況下,本發明仍可進行許多變更。 The present invention has been described in detail above by way of examples, and the embodiments of the present invention are intended to be illustrative only, and those of ordinary skill in the art should understand, without departing from the scope and scope of the invention. Many modifications are possible in the present invention.

Claims (12)

一種光學玻璃,以氧化物基準的質量%計,含有:La 2O 3成分大於0%至45.0%;TiO 2成分大於0%至45.0%;以及BaO成分大於0%至40.0%;並含有SiO 2成分與B 2O 3成分的合計量是5.0%以上30.0%以下;TiO 2/(TiO 2+BaO)的質量比是0.10以上0.90以下;折射率(n d)是1.90以上,阿貝數(ν d)是30.0以下,且表示分光透過率5%之波長(λ 5)為400nm以下。 An optical glass containing, by mass% of oxide, containing: a La 2 O 3 component greater than 0% to 45.0%; a TiO 2 component greater than 0% to 45.0%; and a BaO component greater than 0% to 40.0%; and containing SiO The total amount of the two components and the B 2 O 3 component is 5.0% or more and 30.0% or less; the mass ratio of TiO 2 /(TiO 2 +BaO) is 0.10 or more and 0.90 or less; the refractive index (n d ) is 1.90 or more, and the Abbe number (ν d ) is 30.0 or less, and the wavelength (λ 5 ) indicating that the spectral transmittance is 5% is 400 nm or less. 如請求項1所記載之光學玻璃,其中以氧化物基準的質量%計,SiO 2成分是0%至30.0%;以及B 2O 3成分是0%至30.0%。 The optical glass according to claim 1, wherein the SiO 2 component is 0% to 30.0% by mass based on the oxide, and the B 2 O 3 component is 0% to 30.0%. 如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,ZnO成分是0%至20.0%;Y 2O 3是0%至15.0%;Nb 2O 5成分是0%至25.0%;Yb 2O 3成分是0%至15.0%;以及Gd 2O 3成分是0%至15.0%。 The optical glass according to claim 1 or 2, wherein the ZnO component is 0% to 20.0% by mass based on the oxide; the Y 2 O 3 is 0% to 15.0%; and the Nb 2 O 5 component is 0%. To 25.0%; Yb 2 O 3 component is 0% to 15.0%; and Gd 2 O 3 component is 0% to 15.0%. 如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,(La 2O 3+Nb 2O 5+Gd 2O 3+Yb 2O 3)的質量和是大於0%且60.0%以下。 The optical glass according to claim 1 or 2, wherein the mass sum of (La 2 O 3 + Nb 2 O 5 + Gd 2 O 3 + Yb 2 O 3 ) is greater than 0% by mass based on the oxide. And 60.0% or less. 如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,Ln 2O 3成分(式中,Ln是選自La、Gd、Y、Yb所成群組中的1種以上)的合計量是大於0%且50.0%以下。 The optical glass according to claim 1 or 2, wherein the Ln 2 O 3 component is represented by mass% of the oxide (wherein Ln is one selected from the group consisting of La, Gd, Y, and Yb). The total amount of the above) is more than 0% and 50.0% or less. 如請求項1或2所記載之光學玻璃,其中以氧化物基準計,TiO 2/BaO的質量比是大於0且3.00以下。 The optical glass according to claim 1 or 2, wherein the mass ratio of TiO 2 /BaO is more than 0 and 3.00 or less on the basis of the oxide. 如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,Rn 2O成分(式中,Rn是選自Li、Na、K所成群組中的1種以上)的質量和是15.0%以下。 The optical glass according to claim 1 or 2, wherein the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, and K) is based on the mass% of the oxide. The mass sum is 15.0% or less. 如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,RO成分(式中,R是選自Mg、Ca、Sr、Ba、Zn所成群組中的1種以上)的質量和是大於0%且35.0%以下。  The optical glass according to claim 1 or 2, wherein the RO component is (in the formula, R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, and Zn). The mass sum is greater than 0% and less than 35.0%.   如請求項1或2所記載之光學玻璃,其中以氧化物基準的質量%計,其含有:ZrO 2成分0%至20.0%;WO 3成分0%至10.0%;Ta 2O 5成分0%至10.0%;MgO成分0%至15.0%;CaO成分0%至15.0%;SrO成分0%至15.0%;Li 2O成分0%至15.0%;Na 2O成分0%至15.0%; K 2O成分0%至15.0%;P 2O 5成分0%至10.0%;GeO 2成分0%至10.0%;Al 2O 3成分0%至15.0%;Ga 2O 3成分0%至15.0%;Bi 2O 3成分0%至10.0%;TeO 2成分0%至10.0%;SnO 2成分0%至3.0%;以及Sb 2O 3成分0%至1.0%。 The optical glass according to claim 1 or 2, wherein, based on the mass % of the oxide, it contains: 0% to 20.0% of the ZrO 2 component; 0% to 10.0% of the WO 3 component; and 0% of the Ta 2 O 5 component To 10.0%; 0% to 15.0% of MgO component; 0% to 15.0% of CaO component; 0% to 15.0% of SrO component; 0% to 15.0% of Li 2 O component; 0% to 15.0% of Na 2 O component; K 2 O composition 0% to 15.0%; P 2 O 5 component 0% to 10.0%; GeO 2 component 0% to 10.0%; Al 2 O 3 component 0% to 15.0%; Ga 2 O 3 component 0% to 15.0%; The Bi 2 O 3 component is 0% to 10.0%; the TeO 2 component is 0% to 10.0%; the SnO 2 component is 0% to 3.0%; and the Sb 2 O 3 component is 0% to 1.0%. 一種預成形體,由請求項1或2所記載之光學玻璃而成。  A preform formed of the optical glass described in claim 1 or 2.   一種光學元件,由請求項1或2所記載之光學玻璃而成。  An optical element comprising the optical glass described in claim 1 or 2.   一種光學機器,具備如請求項11之光學元件。  An optical machine having the optical component of claim 11.  
TW106141614A 2016-12-01 2017-11-29 Optical glasses, preforms and optical components TWI821167B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016-234368 2016-12-01
JP2016234368 2016-12-01
JP2017218657A JP7410634B2 (en) 2016-12-01 2017-11-13 Optical glass, preforms and optical elements
JP2017-218657 2017-11-13

Publications (2)

Publication Number Publication Date
TW201827372A true TW201827372A (en) 2018-08-01
TWI821167B TWI821167B (en) 2023-11-11

Family

ID=62563523

Family Applications (2)

Application Number Title Priority Date Filing Date
TW106141614A TWI821167B (en) 2016-12-01 2017-11-29 Optical glasses, preforms and optical components
TW112137993A TW202402695A (en) 2016-12-01 2017-11-29 Optical glass, preform, and optical element

Family Applications After (1)

Application Number Title Priority Date Filing Date
TW112137993A TW202402695A (en) 2016-12-01 2017-11-29 Optical glass, preform, and optical element

Country Status (3)

Country Link
JP (2) JP7410634B2 (en)
CN (1) CN116332506A (en)
TW (2) TWI821167B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7433764B2 (en) * 2019-01-18 2024-02-20 Hoya株式会社 Method for promoting improvement of transmittance of glass, method for manufacturing glass, and glass
CN110937802B (en) * 2019-12-30 2022-07-29 成都光明光电股份有限公司 Optical glass
CN115231818B (en) * 2022-08-26 2023-08-08 成都光明光电股份有限公司 Optical glass, glass preform and optical element
CN115466049B (en) * 2022-10-18 2023-08-08 成都光明光电股份有限公司 Optical glass

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4286652B2 (en) * 2002-12-27 2009-07-01 Hoya株式会社 Optical glass, glass gob for press molding, and optical element
JP4466955B2 (en) * 2005-07-15 2010-05-26 Hoya株式会社 Optical glass, glass gob for press molding, and optical element
JP4446982B2 (en) 2005-09-21 2010-04-07 Hoya株式会社 Optical glass, glass gob for press molding, glass molded body, optical element and production method thereof
CN101289276B (en) * 2008-06-19 2011-08-31 成都光明光电股份有限公司 High-refraction and high- dispersion optical glass and method of manufacture
JP5461420B2 (en) * 2008-11-10 2014-04-02 Hoya株式会社 Manufacturing method of glass, optical glass, glass material for press molding, optical element and manufacturing method thereof
JP2011153048A (en) 2010-01-28 2011-08-11 Konica Minolta Opto Inc Optical glass
JP5766002B2 (en) * 2011-04-25 2015-08-19 Hoya株式会社 Optical glass, glass material for press molding, optical element and manufacturing method thereof, and bonded optical element
CN102503121B (en) * 2011-10-08 2013-09-18 成都光明光电股份有限公司 Optical glass and optical element
JP5979371B2 (en) * 2012-10-19 2016-08-24 Hoya株式会社 Caret, optical glass and method for producing them
JP2015127281A (en) * 2013-12-27 2015-07-09 株式会社オハラ Glass
CN107445474B (en) * 2014-01-22 2020-06-09 成都光明光电股份有限公司 High-refraction high-dispersion optical glass, optical element and optical instrument
JP6509525B2 (en) * 2014-10-30 2019-05-08 株式会社オハラ Optical glass, preform and optical element

Also Published As

Publication number Publication date
TW202402695A (en) 2024-01-16
TWI821167B (en) 2023-11-11
JP2018090473A (en) 2018-06-14
CN116332506A (en) 2023-06-27
JP2024003105A (en) 2024-01-11
JP7410634B2 (en) 2024-01-10

Similar Documents

Publication Publication Date Title
CN108117257B (en) Optical glass, preform and optical element
JP2017039640A (en) Optical glass and optical element
JP6618256B2 (en) Optical glass, preform and optical element
JP7195040B2 (en) Optical glass, preforms and optical elements
JP2016121035A (en) Optical glass, preform and optical element
JP6509525B2 (en) Optical glass, preform and optical element
JP7126379B2 (en) Optical glass, preforms and optical elements
JP2016088758A (en) Optical glass, preform and optical element
TW201834991A (en) Optical glass, preform, and optical element
JP2024003105A (en) Optical glass, preform, and optical element
TWI780088B (en) Optical glasses, preform structures, and optical elements
JP2022167990A (en) Optical glass, preform and optical element
JP2016216282A (en) Optical glass and optical element
JP2016088835A (en) Optical glass, preform and optical element
JP2018052764A (en) Optical glass, preform, and optical element
JP2019172556A (en) Optical glass, preform, and optical element
JPWO2019031095A1 (en) Optical glass, optical element and optical equipment
JP2017019696A (en) Optical glass, preform and optical element
JP2012206891A (en) Optical glass, perform, and optical device
JP2016074558A (en) Optical glass and optical element
JP6675772B2 (en) Optical glass, preform and optical element
CN108129018B (en) Optical glass, preform and optical element
JP2017088484A (en) Optical glass, preform and optical element
JP2018052763A (en) Optical glass, preform, and optical element
JP2017088485A (en) Optical glass, preform and optical element