TW202114956A - Optical glass and optical element - Google Patents

Optical glass and optical element Download PDF

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TW202114956A
TW202114956A TW109133262A TW109133262A TW202114956A TW 202114956 A TW202114956 A TW 202114956A TW 109133262 A TW109133262 A TW 109133262A TW 109133262 A TW109133262 A TW 109133262A TW 202114956 A TW202114956 A TW 202114956A
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content
glass
tio
optical
mass
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TW109133262A
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桑谷俊伍
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日商Ｈｏｙａ股份有限公司
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Priority claimed from JP2019175787A external-priority patent/JP2021050126A/en
Priority claimed from JP2020002064A external-priority patent/JP2021109799A/en
Priority claimed from JP2020125251A external-priority patent/JP2022021586A/en
Application filed by 日商Ｈｏｙａ股份有限公司 filed Critical 日商Ｈｏｙａ股份有限公司
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    • 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
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/16—Silica-free oxide glass compositions containing phosphorus
    • C03C3/21—Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum
    • 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
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/16—Silica-free oxide glass compositions containing phosphorus
    • C03C3/19—Silica-free oxide glass compositions containing phosphorus 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
    • C03C4/00—Compositions for glass with special properties
    • 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

Abstract

To provide an optical glass having a low temperature coefficient of the relative refractive index (dn/dT) thereof due to temperature change and a large average linear thermal expansion coefficient, and an optical element that comprises the optical glass. An optical glass having a refractive index nd of 1.63-1.80, an Abbe number νd of 22-34, a Nb2O5 content of 25-55 mass%, a WO3 content of less than 30 mass%, a total content [TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5] of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 of 36-60 mass%, a mass ratio [(TiO2 + Nb2O5 + WO3 + Bi2O3 + Ta2O5)/(P2O5 + B2O3 + SiO2 + Al2O3 + Li2O + Na2P + K2O + Cs2O)] of the total content of TiO2, Nb2O5, WO3, Bi2O3, and Ta2O5 to the total content of P2O5, B2O3, SiO2, Al2O3, Li2O, Na2O, K2O, and Cs2O of 1.10 or less, and a mass ratio [TiO2/(P2O5 + B2O3)] of the content of TiO2 to the total content of P2O5 and B2O3 of 0.50 or less, and satisfying (A) or (B).

Description

光學玻璃及光學元件Optical glass and optical components

本發明涉及一種光學玻璃及光學元件。The invention relates to an optical glass and an optical element.

安裝至車載用光學儀器的光學元件、或者安裝至投影儀、影印機、雷射印表機及廣播用器材等這樣的產生熱的光學儀器的光學元件在溫度變化大的環境中使用。如果折射率等光學特性因溫度變化而變動，則會對光學系統的成像特性等帶來影響。Optical components mounted on in-vehicle optical devices, or optical components mounted on optical devices that generate heat such as projectors, photocopiers, laser printers, and broadcasting equipment, are used in environments with large temperature changes. If the optical characteristics such as refractive index fluctuate due to temperature changes, it will affect the imaging characteristics of the optical system.

這裡，已知藉由將相對折射率溫度係數(dn/dT)成為負的光學元件與成為正的光學元件組合，可以降低溫度變化對光學系統的成像特性等的影響。Here, it is known that by combining an optical element whose relative refractive index temperature coefficient (dn/dT) becomes negative and an optical element that becomes positive, the influence of temperature changes on the imaging characteristics of the optical system and the like can be reduced.

相對折射率溫度係數(dn/dT)表示相對於溫度變化的折射率變化。對於溫度上升時折射率變低的光學元件而言，相對折射率溫度係數成為負。相反，對於溫度上升時折射率變高的光學元件而言，相對折射率溫度係數成為正。The relative refractive index temperature coefficient (dn/dT) represents the change in refractive index with respect to the change in temperature. For an optical element whose refractive index becomes lower when the temperature rises, the relative refractive index temperature coefficient becomes negative. Conversely, for an optical element whose refractive index becomes higher when the temperature rises, the relative refractive index temperature coefficient becomes positive.

此外，在玻璃的熔融溫度及成型溫度高的情況下，除了生產性差以外，熔融步驟中的玻璃熔融器具(例如，坩堝、熔融玻璃的攪拌器具等)被侵蝕，經濟性也差。因此，需要一種液相溫度LT低、即玻璃的熔融溫度及成型溫度低的玻璃。In addition, when the melting temperature and molding temperature of glass are high, in addition to poor productivity, glass melting tools (for example, crucibles, stirring tools for molten glass, etc.) in the melting step are corroded, and economic efficiency is also poor. Therefore, there is a need for a glass having a low liquidus temperature LT, that is, a low melting temperature and a low molding temperature of the glass.

專利文獻1中公開了一種相對折射率溫度係數(dn/dT)成為負的光學玻璃。然而，已知在專利文獻1的玻璃中，液相溫度LT高，生產性及經濟性差。Patent Document 1 discloses an optical glass whose relative refractive index temperature coefficient (dn/dT) becomes negative. However, it is known that in the glass of Patent Document 1, the liquidus temperature LT is high, and productivity and economy are poor.

此外，光學元件的平均線性熱膨脹係數在進行光學設計時是重要的。在將低折射率低分散玻璃材料和高折射率高分散玻璃材料組合的情況下，玻璃材料的平均線性熱膨脹係數之差越小，接合越好。例如，對於含有氟的低折射率低分散玻璃材料而言，通常平均線性熱膨脹係數大。因此，要求與其組合的高折射率高分散玻璃材料也具有高的平均線性熱膨脹係數。專利文獻2中公開的光學玻璃為高折射率，但低分散且平均線性熱膨脹係數小。因此，需要一種高折射率高分散且平均線性熱膨脹係數大的光學玻璃。 ［現有技術文獻］ ［專利文獻］In addition, the average linear thermal expansion coefficient of the optical element is important in optical design. In the case of combining a low-refractive-index, low-dispersion glass material and a high-refractive-index, high-dispersion glass material, the smaller the difference in the average linear thermal expansion coefficient of the glass material, the better the bonding. For example, for low-refractive-index and low-dispersion glass materials containing fluorine, the average linear thermal expansion coefficient is generally large. Therefore, the high refractive index and high dispersion glass material combined with it is required to also have a high average linear thermal expansion coefficient. The optical glass disclosed in Patent Document 2 has a high refractive index, but has low dispersion and a small average linear thermal expansion coefficient. Therefore, there is a need for an optical glass with high refractive index, high dispersion, and large average linear thermal expansion coefficient. [Existing technical literature] [Patent Literature]

專利文獻1：日本特開2019-1697號公報 專利文獻2：日本特開2007-106611號公報Patent Document 1: Japanese Patent Application Publication No. 2019-1697 Patent Document 2: Japanese Patent Application Laid-Open No. 2007-106611

［發明要解決的問題］[The problem to be solved by the invention]

因此，本發明的目的在於，提供一種基於溫度變化的相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃、以及由上述光學玻璃製成的光學元件。 ［解決問題的方法］Therefore, an object of the present invention is to provide an optical glass with a low relative refractive index temperature coefficient (dn/dT) based on temperature change and a large average linear thermal expansion coefficient, and an optical element made of the above-mentioned optical glass. [way of solving the problem]

本發明的主旨如下所述。 (1)一種光學玻璃，其折射率nd為1.63~1.80， 阿貝數νd為22~34， Nb2 O5 的含量為25~55質量%， WO3 的含量小於30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為36~60質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.10以下， TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下， 且滿足下述(A)或(B)： (A) P2 O5 的含量為20~36質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.50以下， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0質量%以下； (B) P2 O5 的含量為25~38質量%， Al2 O3 的含量小於5質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為7.0質量%以下， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。The gist of the present invention is as follows. (1) An optical glass with a refractive index nd of 1.63 to 1.80, an Abbe number νd of 22 to 34, a Nb 2 O 5 content of 25 to 55% by mass, a WO 3 content of less than 30 mass%, TiO 2 , The total content of Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 36-60% by mass, TiO 2 , Nb 2 The total content of O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, and The mass ratio of the total content of Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O + Cs 2 O)] is 1.10 or less, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3)] is 0.50 or less, and Satisfies the following (A) or (B): (A) The content of P 2 O 5 is 20 to 36% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 The mass ratio of the total content of O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.50 or less, and B 2 O 3 The mass ratio of the content to the content of P 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39, and the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 8.0% by mass or less; (B) The content of P 2 O 5 is 25 to 38% by mass, the content of Al 2 O 3 is less than 5% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 O, K The mass ratio of the total content of 2 O and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, MgO, CaO, SrO and BaO The total content [MgO＋CaO＋SrO＋BaO] is 7.0 mass% or less, and the content of TiO 2 is relative to Ti The mass ratio of the total content of O 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is Above 0.25.

(2)根據(1)所述的光學玻璃，其中，P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.00以上。(2) The optical glass according to (1), wherein the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O The mass ratio [(P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.00 or more.

(3)根據(1)或(2)所述的光學玻璃，其中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為0.50以上。(3) The optical glass according to (1) or (2), wherein the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B The mass ratio of the total content of 2 O 3 , SiO 2 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 + B 2 O 3 + SiO 2 + Al 2 O 3 + Li 2 O + Na 2 O + K 2 O + Cs 2 O)] is 0.50 or more.

(4)一種光學玻璃，其中， P2 O5 的含量為25~50質量%， TiO2 的含量為10~50質量%， Nb2 O5 含量為5~30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60質量%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， 且滿足下述(A)或(B)： (A) WO3 的含量為7質量%以下； (B) 實質上不含F。(4) An optical glass, wherein the content of P 2 O 5 is 25-50% by mass, the content of TiO 2 is 10-50% by mass, the content of Nb 2 O 5 is 5-30 mass%, and the content of TiO 2 and Nb 2 The total content of O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60% by mass, and the content of TiO 2 is relative to TiO 2. The mass ratio of the total content of Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 Above, the mass ratio of the total content of P 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, and satisfies the following (A) or (B): (A) The content of WO 3 is 7% by mass or less; (B) substantially Does not contain F.

(5)一種光學玻璃，其中， P2 O5 的含量為25~50質量%， Nb2 O5 含量為14~40質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60質量%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]為10質量%以上， Na2 O的含量相對於K2 O的含量的質量比[Na2 O/K2 O]為1.50以上。(5) An optical glass, wherein the content of P 2 O 5 is 25-50% by mass, the content of Nb 2 O 5 is 14-40% by mass, TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and The total content of Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60% by mass, and the content of TiO 2 is relative to TiO 2 , Nb 2 O 5 , WO 3 , Bi The mass ratio of the total content of 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 or more, and the content of B 2 O 3 is relative to P The mass ratio of the content of 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39, and the total content of Li 2 O, Na 2 O, K 2 O and Cs 2 O [Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O] 10 mass%, 2 O content of Na relative to the mass of K 2 O content ratio of [Na 2 O / K 2 O ] of 1.50 or more.

(6)根據(5)所述的光學玻璃，其實質上不含F。(6) The optical glass according to (5), which does not substantially contain F.

(7)根據(1)、(2)、(4)~(6)中任一項所述的光學玻璃，其在100~300℃的平均線性熱膨脹係數α為100×10-7 ~200×10-7 ℃-1 。(7) The optical glass according to any one of (1), (2), (4) to (6), which has an average linear thermal expansion coefficient α at 100 to 300°C of 100×10 -7 to 200× 10 -7 ℃ -1 .

(8)根據(1)、(2)、(4)~(6)中任一項所述的光學玻璃，其在He-Ne雷射的波長(633nm)下的相對折射率溫度係數dn/dT在20~40℃的範圍內為-0.1×10-6 ~-13.0×10-6 ℃-1 。(8) The optical glass according to any one of (1), (2), (4) to (6), which has a relative refractive index temperature coefficient dn/ dT is -0.1×10 -6 ~-13.0×10 -6 ℃ -1 in the range of 20-40℃.

(9)一種光學元件，其由上述(1)~(8)中任一項所述的光學玻璃製成。 ［發明的效果］(9) An optical element made of the optical glass described in any one of (1) to (8) above. [Effects of the invention]

根據本發明，可以提供一種基於溫度變化的相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃、以及由上述光學玻璃製成的光學元件。According to the present invention, it is possible to provide an optical glass having a low relative refractive index temperature coefficient (dn/dT) based on a temperature change and a large average linear thermal expansion coefficient, and an optical element made of the above-mentioned optical glass.

在本發明及本說明書中，只要沒有特別記載，光學玻璃的玻璃組成以氧化物基準表示。其中，「氧化物基準的玻璃組成」是指，按照玻璃原料在熔融時全部分解而在光學玻璃中以氧化物的形式存在的物質進行換算而得到的玻璃組成，各玻璃成分的表述按照習慣記載為SiO2 、TiO2 等。只要沒有特別記載，則玻璃成分的含量及合計含量為質量基準，「%」是指「質量%」。In the present invention and this specification, unless otherwise stated, the glass composition of the optical glass is expressed on an oxide basis. Among them, the "oxide-based glass composition" refers to the glass composition obtained by converting the glass raw materials into the form of oxides in the optical glass when the glass raw materials are completely decomposed during melting, and the expression of each glass component is described in accordance with custom It is SiO 2 , TiO 2 and so on. Unless otherwise stated, the content and total content of the glass components are based on quality, and "%" means "% by mass".

玻璃成分的含量可以藉由公知的方法、例如電感耦合電漿原子發射光譜法(ICP-AES)、電感耦合電漿質譜分析法(ICP-MS)等方法進行定量。另外，在本說明書及本發明中，構成成分的含量為0%是指，實質上不含該構成成分，允許以不可避免的雜質水準含有該成分。The content of the glass component can be quantified by a known method, such as inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), and the like. In addition, in the present specification and the present invention, the content of a constituent component being 0% means that the constituent component is not substantially contained, and it is allowed to contain the component at an unavoidable impurity level.

本說明書中，玻璃的熱穩定性及耐失透性都是指在玻璃中的結晶析出的難易度。特別地，熱穩定性是指熔融狀態的玻璃固化時結晶析出的難易度，耐失透性是指在再熱壓製時這樣的將固化後的玻璃再加熱時結晶析出的難易度。In this specification, the thermal stability and devitrification resistance of glass both refer to the difficulty of crystal precipitation in the glass. In particular, thermal stability refers to the ease with which crystals precipitate when the glass in a molten state is solidified, and the devitrification resistance refers to the ease with which crystals precipitate when the solidified glass is reheated at the time of reheat pressing.

另外，在本說明書中，只要沒有特別記載，折射率是指在氦的d射線(波長587.56nm)下的折射率nd。In addition, in this specification, unless otherwise stated, the refractive index means the refractive index nd under the d-ray (wavelength of 587.56 nm) of helium.

另外，阿貝數νd是被用作表示與分散相關的性質的值，由以下的數學式表示。其中，nF為藍色氫的F射線(波長486.13nm)下的折射率、nC為紅色氫的C射線(656.27nm)下的折射率。 νd＝(nd－1)/nF－nC…(1)In addition, the Abbe number νd is a value used to express properties related to dispersion, and is expressed by the following mathematical formula. Among them, nF is the refractive index under the F-ray (wavelength: 486.13 nm) of blue hydrogen, and nC is the refractive index under the C-ray (656.27 nm) of red hydrogen. νd=(nd-1)/nF-nC...(1)

以下，將本發明的光學玻璃分成第1實施方式、第2實施方式、第3實施方式進行說明。Hereinafter, the optical glass of the present invention is divided into a first embodiment, a second embodiment, and a third embodiment and will be described.

第1實施方式 對第1實施方式的光學玻璃詳細地進行說明。 第1實施方式的光學玻璃的折射率nd為1.63~1.80， 阿貝數νd為22~34， Nb2 O5 的含量為25~55質量%， WO3 的含量小於30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為36~60質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.10以下， TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下， 且滿足下述(A)或(B)： (A) P2 O5 的含量為20~36質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.50以下， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0質量%以下； (B) P2 O5 的含量為25~38質量%， Al2 O3 的含量小於5質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為7.0質量%以下， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。1st Embodiment The optical glass of 1st Embodiment is demonstrated in detail. The refractive index nd of the optical glass of the first embodiment is 1.63 to 1.80, the Abbe number νd is 22 to 34, the content of Nb 2 O 5 is 25 to 55% by mass, the content of WO 3 is less than 30 mass%, and TiO 2 , The total content of Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 36-60% by mass, TiO 2 , Nb 2 The total content of O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, and The mass ratio of the total content of Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O + Cs 2 O)] is 1.10 or less, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3)] is 0.50 or less, and Satisfies the following (A) or (B): (A) The content of P 2 O 5 is 20 to 36% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 The mass ratio of the total content of O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.50 or less, and B 2 O 3 The mass ratio of the content to the content of P 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39, and the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 8.0% by mass or less; (B) The content of P 2 O 5 is 25 to 38% by mass, the content of Al 2 O 3 is less than 5% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 O, K The mass ratio of the total content of 2 O and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, MgO, CaO, SrO and BaO The total content [MgO＋CaO＋SrO＋BaO] is 7.0 mass% or less, and the content of TiO 2 is relative to T The mass ratio of the total content of iO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is Above 0.25.

以下，只要沒有特別記載，第1實施方式的光學玻璃是指滿足上述(A)的第1實施方式的光學玻璃及滿足上述(B)的第1實施方式的光學玻璃。Hereinafter, unless otherwise stated, the optical glass of the first embodiment refers to the optical glass of the first embodiment satisfying the above (A) and the optical glass of the first embodiment satisfying the above (B).

在第1實施方式的光學玻璃中，折射率nd為1.63~1.80。折射率nd的下限可以為1.65、1.67或1.69，折射率nd的上限可以為1.79、1.78或1.77。In the optical glass of the first embodiment, the refractive index nd is 1.63 to 1.80. The lower limit of the refractive index nd may be 1.65, 1.67, or 1.69, and the upper limit of the refractive index nd may be 1.79, 1.78, or 1.77.

可以藉由適宜調整各玻璃成分的含量而使折射率nd為期望的值。具有相對地提高折射率nd的作用的成分(高折射率化成分)為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 、La2 O3 等。另一方面，具有相對地降低折射率nd的作用的成分(低折射率化成分)為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O等。因此，例如可以藉由增加TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]來提高折射率nd，可以藉由減少該質量比來降低折射率nd。The refractive index nd can be a desired value by appropriately adjusting the content of each glass component. The components having the effect of relatively increasing the refractive index nd (high refractive index components) are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 , La 2 O 3 and the like. On the other hand, the components (low-refractive-index components) having the effect of relatively lowering the refractive index nd are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, and the like. Therefore, for example, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 can be increased relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 O 3 , The mass ratio of the total content of Li 2 O, Na 2 O, K 2 O and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 +SiO 2 +Al 2 O 3 +Li 2 O+Na 2 O+K 2 O+Cs 2 O)] to increase the refractive index nd, and the refractive index nd can be lowered by reducing the mass ratio.

在第1實施方式的光學玻璃中，阿貝數νd為22~34。阿貝數νd的下限可以為22.5、23或23.5，阿貝數νd的上限可以為32、30或28。In the optical glass of the first embodiment, the Abbe number νd is 22 to 34. The lower limit of the Abbe number νd can be 22.5, 23, or 23.5, and the upper limit of the Abbe number νd can be 32, 30, or 28.

可以藉由適宜調整各玻璃成分的含量而使阿貝數νd為期望的值。阿貝數νd相對較低的成分、即高分散化成分為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 等。另一方面，阿貝數νd相對較高的成分、即低分散化成分為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O、La2 O3 、BaO、CaO、SrO等。The Abbe number νd can be adjusted to a desired value by appropriately adjusting the content of each glass component. Components with a relatively low Abbe number νd, that is, highly dispersed components, are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 and the like. On the other hand, components with relatively high Abbe number νd, that is, low-dispersion components, are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, La 2 O 3 , BaO, CaO, SrO, etc.

在第1實施方式的光學玻璃中，Nb2 O5 的含量為25~55%。Nb2 O5 的含量的下限較佳為27%，進一步以29%、31%、33%的順序更佳。另外，Nb2 O5 的含量的上限較佳為53%，進一步以51%、49%、47%的順序更佳。In the optical glass of the first embodiment, the content of Nb 2 O 5 is 25 to 55%. The lower limit of the Nb 2 O 5 content is preferably 27%, and more preferably in the order of 29%, 31%, and 33%. In addition, the upper limit of the Nb 2 O 5 content is preferably 53%, and more preferably in the order of 51%, 49%, and 47%.

Nb2 O5 是有助於高折射率化及高分散化的成分。因此，藉由將Nb2 O5 的含量設為上述範圍，可以得到具有期望的光學常數的光學玻璃。另一方面，Nb2 O5 的含量過多時，存在玻璃的著色增強的擔憂。Nb 2 O 5 is a component that contributes to high refractive index and high dispersion. Therefore, by setting the content of Nb 2 O 5 in the above range, an optical glass having a desired optical constant can be obtained. On the other hand, when the content of Nb 2 O 5 is too large, the coloring of the glass may increase.

在第1實施方式的光學玻璃中，WO3 的含量小於30%。WO3 的含量的上限較佳為20%，進一步以15%、10%、5%的順序更佳。較佳WO3 的含量少的情況，其下限較佳為0%。WO3 的含量也可以為0%。In the optical glass of the first embodiment, the content of WO 3 is less than 30%. The upper limit of the content of WO 3 is preferably 20%, and more preferably in the order of 15%, 10%, and 5%. Preferably , when the content of WO 3 is small, the lower limit is preferably 0%. The content of WO 3 may also be 0%.

藉由將WO3 的含量設為上述範圍，可以提高透射率，而且可以抑制玻璃的比重的增大。另外，可以降低相對折射率溫度係數(dn/dT)。By setting the content of WO 3 in the above-mentioned range, the transmittance can be improved and the increase in the specific gravity of the glass can be suppressed. In addition, the relative refractive index temperature coefficient (dn/dT) can be reduced.

在第1實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為36~60%。該合計含量的下限較佳為38%，進一步以40%、41%、42%的順序更佳。另外，該合計含量的上限較佳為58%，進一步以56%、54%、52%的順序更佳。In the optical glass of the first embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] Is 36~60%. The lower limit of the total content is preferably 38%, and more preferably in the order of 40%, 41%, and 42%. In addition, the upper limit of the total content is preferably 58%, and more preferably in the order of 56%, 54%, and 52%.

TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 是有助於玻璃的高分散化的成分。因此，藉由將合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]設為上述範圍，可以得到具有期望的光學常數的光學玻璃。另外，玻璃的熱穩定性也可以改善。另一方面，該合計含量過多時，存在不能得到具有期望的光學常數的光學玻璃的擔憂，而且存在玻璃的熱穩定性降低、玻璃的著色增強的擔憂。TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 are components that contribute to the high dispersion of glass. Therefore, by setting the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 ] in the above range, an optical glass having a desired optical constant can be obtained. In addition, the thermal stability of the glass can also be improved. On the other hand, when the total content is too large, there is a possibility that an optical glass having a desired optical constant may not be obtained, and there is also a possibility that the thermal stability of the glass decreases and the coloration of the glass increases.

在第1實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.10以下。該質量比的上限較佳為1.07，進一步以1.04、1.02、1.00的順序更佳。另外，該質量比的下限更佳為0.50，進一步以0.55、0.60、0.65的順序更佳。In the optical glass of the first embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 The mass ratio of the total content of O 3 , Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 + SiO 2 + Al 2 O 3 + Li 2 O + Na 2 O + K 2 O + Cs 2 O)] is 1.10 or less. The upper limit of the mass ratio is preferably 1.07, and more preferably in the order of 1.04, 1.02, and 1.00. In addition, the lower limit of the mass ratio is more preferably 0.50, and further more preferably in the order of 0.55, 0.60, and 0.65.

藉由將質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，可得到具有期望的光學常數的光學玻璃。By changing the mass ratio [(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )/(P 2 O 5 +B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O) ] When it is set to the above range, an optical glass having a desired optical constant can be obtained.

在第1實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下。In the optical glass of the first embodiment, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3)] is 0.50 or less.

藉由將質量比[TiO2 /(P2 O5 ＋B2 O3 )]設為上述範圍，可得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /(P 2 O 5 +B 2 O 3 )] in the above range, an optical glass having a desired optical constant and high thermal stability can be obtained.

第1實施方式的光學玻璃如上所述，滿足(A)或(B)。首先，對(A)進行詳細敘述。The optical glass of the first embodiment satisfies (A) or (B) as described above. First, (A) will be described in detail.

第1實施方式的光學玻璃可以滿足下述要件： (A) P2 O5 的含量為20~36質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.50以下， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0質量%以下。The optical glass of the first embodiment can satisfy the following requirements: (A) The content of P 2 O 5 is 20 to 36% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, The mass ratio of the total content of Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.50 or less, B 2 O The mass ratio of the content of 3 to the content of P 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39, and the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 8.0% by mass or less.

在滿足上述(A)的第1實施方式的光學玻璃中，P2 O5 的含量為20~36%。P2 O5 的含量的下限較佳為21%，進一步以22%、23%、24%的順序更佳。另外，P2 O5 的含量的上限較佳為35%，進一步以34%、33%、32%的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the content of P 2 O 5 is 20 to 36%. The lower limit of the content of P 2 O 5 is preferably 21%, and more preferably in the order of 22%, 23%, and 24%. In addition, the upper limit of the content of P 2 O 5 is preferably 35%, and more preferably in the order of 34%, 33%, and 32%.

P2 O5 是玻璃的網絡形成成分，是為了在玻璃中大量含有高分散成分的必要成分。藉由將P2 O5 的含量設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。P 2 O 5 is a network-forming component of glass, and is an essential component in order to contain a large amount of highly dispersed components in the glass. By setting the content of P 2 O 5 in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在滿足上述(A)的第1實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.50以下。該質量比的上限較佳為1.47，進一步以1.44、1.42、1.40的順序更佳。另外，該質量比的下限較佳為1.00，進一步以1.05、1.08、1.10的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O The content mass ratio [(P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.50 or less. The upper limit of the mass ratio is preferably 1.47, and more preferably in the order of 1.44, 1.42, and 1.40. In addition, the lower limit of the mass ratio is preferably 1.00, and more preferably in the order of 1.05, 1.08, and 1.10.

藉由將質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，可得到熱穩定性高、相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃。By setting the mass ratio [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] to the above range, high thermal stability and relative refractive index temperature coefficient (dn /dT) Optical glass with low average linear thermal expansion coefficient.

在滿足上述(A)的第1實施方式的光學玻璃中，B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39。該質量比的下限較佳為0.06，進一步以0.07、0.08、0.09的順序更佳。另外，該質量比的上限更佳為0.36，進一步以0.33、0.31、0.29的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the mass ratio of the content of B 2 O 3 to the content of P 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39. The lower limit of the mass ratio is preferably 0.06, and more preferably in the order of 0.07, 0.08, and 0.09. In addition, the upper limit of the mass ratio is more preferably 0.36, and further more preferably in the order of 0.33, 0.31, and 0.29.

藉由將質量比[B2 O3 /P2 O5 ]設為上述範圍，可得到相對折射率溫度係數(dn/dT)低、平均線性熱膨脹係數大、耐失透性高、進而液相溫度LT低的光學玻璃。By setting the mass ratio [B 2 O 3 /P 2 O 5 ] to the above range, it is possible to obtain a low relative refractive index temperature coefficient (dn/dT), a large average linear thermal expansion coefficient, high devitrification resistance, and a liquid phase Optical glass with low temperature LT.

在滿足上述(A)的第1實施方式的光學玻璃中，MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0%以下。該合計含量的上限較佳為6%，進一步以5%、4%、3%的順序更佳。另外，該合計含量的下限較佳為0%。In the optical glass of the first embodiment that satisfies the above (A), the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 8.0% or less. The upper limit of the total content is preferably 6%, and more preferably in the order of 5%, 4%, and 3%. In addition, the lower limit of the total content is preferably 0%.

藉由將合計含量[MgO＋CaO＋SrO＋BaO]設為上述範圍，可以促進高分散化。By setting the total content [MgO+CaO+SrO+BaO] in the above range, high dispersion can be promoted.

另外，在滿足上述(A)的第1實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下。該質量比的上限較佳為0.47，進一步以0.44、0.42、0.40的順序更佳。另外，該質量比的下限更佳為0.00，進一步以0.03、0.06、0.08、0.10的順序更佳。Further, the optical glass satisfying the above (A) according to the first embodiment, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3 )] is 0.50 or less. The upper limit of the mass ratio is preferably 0.47, and more preferably in the order of 0.44, 0.42, and 0.40. In addition, the lower limit of the mass ratio is more preferably 0.00, and more preferably in the order of 0.03, 0.06, 0.08, and 0.10.

藉由將質量比[TiO2 /(P2 O5 ＋B2 O3 )]設為上述範圍，可得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /(P 2 O 5 +B 2 O 3 )] in the above range, an optical glass having a desired optical constant and high thermal stability can be obtained.

對於滿足上述(A)的第1實施方式的光學玻璃中的玻璃成分的含量及比率，以下示出非限定性的實例。Regarding the content and ratio of the glass component in the optical glass of the first embodiment satisfying the above (A), non-limiting examples are shown below.

在滿足上述(A)的第1實施方式的光學玻璃中，B2 O3 的含量的上限較佳為10%，進一步以8%、7%、6%的順序更佳。另外，B2 O3 的含量的下限較佳為1%，進一步以1.5%、1.8%、2.0%的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the upper limit of the content of B 2 O 3 is preferably 10%, and more preferably in the order of 8%, 7%, and 6%. In addition, the lower limit of the content of B 2 O 3 is preferably 1%, and more preferably in the order of 1.5%, 1.8%, and 2.0%.

B2 O3 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性的作用。另一方面，B2 O3 的含量多時，存在耐失透性降低的傾向。因此，B2 O3 的含量較佳為上述範圍。B 2 O 3 is a network forming component of glass and has the effect of improving the thermal stability of glass. On the other hand, when the content of B 2 O 3 is large, the devitrification resistance tends to decrease. Therefore, the content of B 2 O 3 is preferably within the above-mentioned range.

在滿足上述(A)的第1實施方式的光學玻璃中，Al2 O3 的含量較佳為3%以下，進一步以2%以下、1%以下的順序更佳。Al2 O3 的含量也可以為0%。In the optical glass of the first embodiment that satisfies the above (A), the content of Al 2 O 3 is preferably 3% or less, and more preferably in the order of 2% or less and 1% or less. The content of Al 2 O 3 may also be 0%.

Al2 O3 是具有改善玻璃的化學耐久性、耐候性的作用的玻璃成分，可以將其視為網絡形成成分。另一方面，Al2 O3 的含量變多時，玻璃的耐失透性降低。另外，容易發生玻璃化轉變溫度Tg上升、熱穩定性降低等問題。從避免這樣的問題的觀點考慮，Al2 O3 的含量的上限較佳為上述範圍。Al 2 O 3 is a glass component that has the effect of improving the chemical durability and weather resistance of glass, and it can be regarded as a network forming component. On the other hand, when the content of Al 2 O 3 increases, the devitrification resistance of the glass decreases. In addition, problems such as an increase in the glass transition temperature Tg and a decrease in thermal stability are likely to occur. From the viewpoint of avoiding such a problem, the upper limit of the content of Al 2 O 3 is preferably the above range.

在滿足上述(A)的第1實施方式的光學玻璃中，TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]的下限較佳為0，進一步以0.02、0.04、0.06的順序更佳。另外，該質量比的上限較佳為0.50，進一步以0.45、0.40、0.35的順序更佳。In the optical glass satisfying the above (A) according to the first embodiment, TiO 2 content with respect to TiO 2, Nb 2 O 5, 3 mass 2 O 3 and the total content of Ta 2 O 5 is Bi WO, ratio of [Ti02 The lower limit of 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is preferably 0, and more preferably in the order of 0.02, 0.04, and 0.06. In addition, the upper limit of the mass ratio is preferably 0.50, and more preferably in the order of 0.45, 0.40, and 0.35.

TiO2 是在高折射率化成分中、高折射率化的作用特別大的成分。因此，從得到期望的光學常數的觀點考慮，質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]較佳為上述範圍。TiO 2 is a component that plays a particularly large role in increasing the refractive index among components that increase the refractive index. Therefore, from the viewpoint of obtaining desired optical constants, the mass ratio [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is preferably in the above-mentioned range.

在滿足上述(A)的第1實施方式的光學玻璃中，TiO2 的含量的下限較佳為0%，進一步以1%、2%、3%、4%的順序更佳。TiO2 的含量也可以為0%。另外，TiO2 的含量的上限較佳為15%，進一步以13%、11%、10%的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the lower limit of the content of TiO 2 is preferably 0%, and more preferably in the order of 1%, 2%, 3%, and 4%. The content of TiO 2 may also be 0%. In addition, the upper limit of the content of TiO 2 is preferably 15%, and more preferably in the order of 13%, 11%, and 10%.

TiO2 特別有助於高分散化。另一方面，TiO2 比較容易增大玻璃的著色，而且存在容易使熔融性惡化的擔憂。因此，TiO2 的含量較佳為上述範圍。TiO 2 particularly contributes to high dispersion. On the other hand, TiO 2 is relatively easy to increase the coloration of the glass, and there is a concern that it is likely to deteriorate the meltability. Therefore, the content of TiO 2 is preferably within the above-mentioned range.

在滿足上述(A)的第1實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 及Bi2 O3 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]的下限較佳為36%，進一步以38%、40%、41%、42%的順序更佳。另外，合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]的上限較佳為58%，進一步以56%、54%、52%的順序更佳。The lower limit of the total content of TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ] in the optical glass of the first embodiment satisfying the above (A) It is preferably 36%, and further preferably in the order of 38%, 40%, 41%, and 42%. In addition, the upper limit of the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 ] is preferably 58%, and more preferably in the order of 56%, 54%, and 52%.

TiO2 、Nb2 O5 、WO3 及Bi2 O3 有助於玻璃的高分散化，而且藉由適量含有，也具有改善玻璃的熱穩定性的作用。另一方面，也是增大玻璃的著色的成分。因此，合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]較佳為上述範圍。TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 contribute to the high dispersion of the glass, and if contained in an appropriate amount, it also has the effect of improving the thermal stability of the glass. On the other hand, it is also a component that increases the coloring of the glass. Therefore, the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 ] is preferably in the above-mentioned range.

在滿足上述(A)的第1實施方式的光學玻璃中，Na2 O的含量的下限較佳為6%，進一步以8%、9%、10%的順序更佳。另外，Na2 O的含量的上限較佳為30%，進一步以28%、26%、25%的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the lower limit of the Na 2 O content is preferably 6%, and more preferably in the order of 8%, 9%, and 10%. In addition, the upper limit of the content of Na 2 O is preferably 30%, and more preferably in the order of 28%, 26%, and 25%.

Na2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Na2 O的含量變多時，耐失透性降低。因此，Na2 O的含量較佳為上述範圍。Na 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Na 2 O increases, the devitrification resistance decreases. Therefore, the content of Na 2 O is preferably within the above-mentioned range.

在滿足上述(A)的第1實施方式的光學玻璃中，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]的上限較佳為35%，進一步以33%、31%、30%的順序更佳。另外，該合計含量的下限較佳為10%，進一步以14%、17%、18%的順序更佳。In the optical glass of the first embodiment that satisfies the above (A), the upper limit of the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O + Na 2 O + K 2 O] is preferably 35%, and more preferably 33 The order of %, 31%, and 30% is better. In addition, the lower limit of the total content is preferably 10%, and more preferably in the order of 14%, 17%, and 18%.

Li2 O、Na2 O及K2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]較佳為上述範圍。Li 2 O, Na 2 O, and K 2 O all have the effect of improving the thermal stability of glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O+Na 2 O+K 2 O] is preferably within the above-mentioned range.

接下來，對(B)進行詳細敘述。Next, (B) will be described in detail.

第1實施方式的光學玻璃可以滿足下述要件： (B) P2 O5 的含量為25~38質量%， Al2 O3 的含量小於5質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為7.0質量%以下， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。The optical glass of the first embodiment can satisfy the following requirements: (B) The content of P 2 O 5 is 25 to 38% by mass, the content of Al 2 O 3 is less than 5% by mass, and the content of P 2 O 5 , B 2 O 3 and The mass ratio of the total content of SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 7.0% by mass or less, and the content of TiO 2 is relative to TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta The mass ratio of the total content of 2 O 5 [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is 0.25 or more.

在滿足上述(B)的第1實施方式的光學玻璃中，P2 O5 的含量為25~38%。P2 O5 的含量的下限較佳為26%，進一步以27%、28%、29%、30%的順序更佳。另外，P2 O5 的含量的上限較佳為37%。In the optical glass of the first embodiment that satisfies the above (B), the content of P 2 O 5 is 25 to 38%. The lower limit of the content of P 2 O 5 is preferably 26%, and more preferably in the order of 27%, 28%, 29%, and 30%. In addition, the upper limit of the content of P 2 O 5 is preferably 37%.

P2 O5 是玻璃的網絡形成成分，是為了在玻璃中大量含有高分散成分的必要成分。藉由將P2 O5 的含量設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。P 2 O 5 is a network-forming component of glass, and is an essential component in order to contain a large amount of highly dispersed components in the glass. By setting the content of P 2 O 5 in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在滿足上述(B)的第1實施方式的光學玻璃中，Al2 O3 的含量小於5%。Al2 O3 的含量較佳為3%以下，進一步以2%以下、1%以下的順序更佳。Al2 O3 的含量也可以為0%。In the optical glass of the first embodiment that satisfies the above (B), the content of Al 2 O 3 is less than 5%. The content of Al 2 O 3 is preferably 3% or less, and more preferably in the order of 2% or less and 1% or less. The content of Al 2 O 3 may also be 0%.

Al2 O3 是具有改善玻璃的化學耐久性、耐候性的作用的玻璃成分，可以將其視為網絡形成成分。另一方面，Al2 O3 的含量變多時，玻璃的耐失透性降低。另外，容易發生玻璃化轉變溫度Tg上升、熱穩定性降低等問題。從避免這樣的問題的觀點考慮，Al2 O3 的含量的上限較佳為上述範圍。Al 2 O 3 is a glass component that has the effect of improving the chemical durability and weather resistance of glass, and it can be regarded as a network forming component. On the other hand, when the content of Al 2 O 3 increases, the devitrification resistance of the glass decreases. In addition, problems such as an increase in the glass transition temperature Tg and a decrease in thermal stability are likely to occur. From the viewpoint of avoiding such a problem, the upper limit of the content of Al 2 O 3 is preferably the above range.

在滿足上述(B)的第1實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下。該質量比的上限較佳為1.78，進一步以1.76、1.74的順序更佳。另外，該質量比的下限較佳為1.00，進一步以1.05、1.08、1.10的順序更佳。In the optical glass of the first embodiment that satisfies the above (B), the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O The content mass ratio [(P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.80 or less. The upper limit of the mass ratio is preferably 1.78, and more preferably in the order of 1.76 and 1.74. In addition, the lower limit of the mass ratio is preferably 1.00, and more preferably in the order of 1.05, 1.08, and 1.10.

藉由將質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，可得到熱穩定性高、相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃。By setting the mass ratio [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] to the above range, high thermal stability and relative refractive index temperature coefficient (dn /dT) Optical glass with low average linear thermal expansion coefficient.

在滿足上述(B)的第1實施方式的光學玻璃中，MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為7.0%以下。該合計含量的上限較佳為6%，進一步以5%、4%、3%的順序更佳。另外，該合計含量的下限較佳為0%。In the optical glass of the first embodiment that satisfies the above (B), the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 7.0% or less. The upper limit of the total content is preferably 6%, and more preferably in the order of 5%, 4%, and 3%. In addition, the lower limit of the total content is preferably 0%.

藉由將合計含量[MgO＋CaO＋SrO＋BaO]設為上述範圍，可以促進高分散化。By setting the total content [MgO+CaO+SrO+BaO] in the above range, high dispersion can be promoted.

在滿足上述(B)的第1實施方式的光學玻璃中，TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。該質量比的下限較佳為0.26，進一步以0.27、0.28、0.29的順序更佳。另外，該質量比的上限較佳為0.50，進一步以0.45、0.40、0.35的順序更佳。In the optical glass satisfying the above (B) according to the first embodiment, TiO 2 content with respect to TiO 2, Nb 2 O 5, 3 mass 2 O 3 and the total content of Ta 2 O 5 is Bi WO, ratio of [Ti02 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is 0.25 or more. The lower limit of the mass ratio is preferably 0.26, and more preferably in the order of 0.27, 0.28, and 0.29. In addition, the upper limit of the mass ratio is preferably 0.50, and more preferably in the order of 0.45, 0.40, and 0.35.

TiO2 是高折射率化成分中、高折射率化的作用特別大的成分。因此，從得到期望的光學常數的觀點考慮，質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]較佳為上述範圍。TiO 2 is a component that has a particularly large effect of increasing the refractive index among components that increase the refractive index. Therefore, from the viewpoint of obtaining desired optical constants, the mass ratio [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is preferably in the above-mentioned range.

另外，在滿足上述(B)的第1實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下。該質量比的上限較佳為0.47，進一步以0.46、0.45的順序較佳。另外，該質量比的下限較佳為0.00，進一步以0.20、0.25、0.30、0.35的順序較佳。Further, the optical glass satisfying the above (B) according to the first embodiment, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3 )] is 0.50 or less. The upper limit of the mass ratio is preferably 0.47, and more preferably in the order of 0.46 and 0.45. In addition, the lower limit of the mass ratio is preferably 0.00, and more preferably in the order of 0.20, 0.25, 0.30, and 0.35.

藉由將質量比[TiO2 /(P2 O5 ＋B2 O3 )]設為上述範圍，可得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /(P 2 O 5 +B 2 O 3 )] in the above range, an optical glass having a desired optical constant and high thermal stability can be obtained.

對於滿足上述(B)的第1實施方式的光學玻璃中的玻璃成分的含量及比率，以下示出非限定性的實例。Regarding the content and ratio of the glass component in the optical glass of the first embodiment satisfying the above (B), non-limiting examples are shown below.

在滿足上述(B)的第1實施方式的光學玻璃中，B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]的下限較佳為0。該質量比也可以為0。另外，該質量比的上限更佳為0.36，進一步以0.33、0.31、0.29的順序更佳。In the optical glass of the first embodiment that satisfies the above (B), the lower limit of the mass ratio [B 2 O 3 /P 2 O 5 ] of the content of B 2 O 3 to the content of P 2 O 5 is preferably 0 . The mass ratio may also be zero. In addition, the upper limit of the mass ratio is more preferably 0.36, and further more preferably in the order of 0.33, 0.31, and 0.29.

藉由將質量比[B2 O3 /P2 O5 ]設為上述範圍，可得到相對折射率溫度係數(dn/dT)低、平均線性熱膨脹係數大、耐失透性高、而且液相溫度LT低的光學玻璃。By setting the mass ratio [B 2 O 3 /P 2 O 5 ] to the above range, low relative refractive index temperature coefficient (dn/dT), high average linear thermal expansion coefficient, high devitrification resistance, and liquid phase can be obtained. Optical glass with low temperature LT.

在滿足上述(B)的第1實施方式的光學玻璃中，B2 O3 的含量的上限較佳為10%，進一步以8%、7%、6%的順序更佳。另外，B2 O3 的含量的下限較佳為0%。B2 O3 的含量也可以為0%。In the optical glass of the first embodiment that satisfies the above (B), the upper limit of the content of B 2 O 3 is preferably 10%, and more preferably in the order of 8%, 7%, and 6%. In addition, the lower limit of the content of B 2 O 3 is preferably 0%. The content of B 2 O 3 may also be 0%.

B2 O3 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性的作用。另一方面，B2 O3 的含量多時，存在耐失透性降低的傾向。因此，B2 O3 的含量較佳為上述範圍。B 2 O 3 is a network forming component of glass and has the effect of improving the thermal stability of glass. On the other hand, when the content of B 2 O 3 is large, the devitrification resistance tends to decrease. Therefore, the content of B 2 O 3 is preferably within the above-mentioned range.

在滿足上述(B)的第1實施方式的光學玻璃中，TiO2 的含量的下限較佳為0%，進一步以1%、2%、3%、4%、6%、8%、10%、12%的順序更佳。TiO2 的含量也可以為0%。另外，TiO2 的含量的上限較佳為15%。In the optical glass of the first embodiment that satisfies the above (B), the lower limit of the content of TiO 2 is preferably 0%, and further is 1%, 2%, 3%, 4%, 6%, 8%, 10% The order of 12% is better. The content of TiO 2 may also be 0%. In addition, the upper limit of the content of TiO 2 is preferably 15%.

TiO2 特別有助於高分散化。另一方面，TiO2 比較容易增大玻璃的著色，而且存在容易使熔融性惡化的擔憂。因此，TiO2 的含量較佳為上述範圍。TiO 2 particularly contributes to high dispersion. On the other hand, TiO 2 is relatively easy to increase the coloration of the glass, and there is a concern that it is likely to deteriorate the meltability. Therefore, the content of TiO 2 is preferably within the above-mentioned range.

在滿足上述(B)的第1實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 及Bi2 O3 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]的下限較佳為36%，進一步以38%、40%、41%、42%的順序更佳。另外，合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]的上限較佳為58%，進一步以56%、54%、52%、50%、48%、46%的順序更佳。The lower limit of the total content of TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ] in the optical glass of the first embodiment that satisfies the above (B) It is preferably 36%, and further preferably in the order of 38%, 40%, 41%, and 42%. In addition, the upper limit of the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 ] is preferably 58%, and more preferably in the order of 56%, 54%, 52%, 50%, 48%, and 46%.

TiO2 、Nb2 O5 、WO3 及Bi2 O3 有助於玻璃的高分散化，而且藉由適量含有，還具有改善玻璃的熱穩定性的作用。另一方面，也是增大玻璃的著色的成分。因此，其合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ]較佳為上述範圍。TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 contribute to the high dispersion of the glass, and if contained in an appropriate amount, it also has the effect of improving the thermal stability of the glass. On the other hand, it is also a component that increases the coloring of the glass. Therefore, the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 ] is preferably in the above-mentioned range.

在滿足上述(B)的第1實施方式的光學玻璃中，Na2 O的含量的下限較佳為6%，進一步以8%、9%、10%的順序更佳。另外，Na2 O的含量的上限較佳為30%，進一步以28%、26%、25%、22%、20%、18%、17%的順序更佳。In the optical glass of the first embodiment that satisfies the above (B), the lower limit of the Na 2 O content is preferably 6%, and more preferably in the order of 8%, 9%, and 10%. In addition, the upper limit of the content of Na 2 O is preferably 30%, and more preferably in the order of 28%, 26%, 25%, 22%, 20%, 18%, and 17%.

Na2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Na2 O的含量變多時，耐失透性降低。因此，Na2 O的含量較佳為上述範圍。Na 2 O is a component that contributes to lowering the specific gravity of glass, and has the effect of improving the meltability of glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Na 2 O increases, the devitrification resistance decreases. Therefore, the content of Na 2 O is preferably within the above-mentioned range.

在滿足上述(B)的第1實施方式的光學玻璃中，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]的上限較佳為35%，進一步以33%、31%、30%、28%、27%、26%、25%的順序較佳。另外，該合計含量的下限較佳為10%，進一步以14%、17%、18%、20%的順序更佳。In the optical glass of the first embodiment that satisfies the above (B), the upper limit of the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O + Na 2 O + K 2 O] is preferably 35%, and more preferably 33 The order of %, 31%, 30%, 28%, 27%, 26%, 25% is better. In addition, the lower limit of the total content is preferably 10%, and more preferably in the order of 14%, 17%, 18%, and 20%.

Li2 O、Na2 O及K2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]較佳為上述範圍。Li 2 O, Na 2 O, and K 2 O all have the effect of improving the thermal stability of glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O+Na 2 O+K 2 O] is preferably within the above-mentioned range.

在滿足上述(B)的第1實施方式的光學玻璃中，Nb2 O5 的含量為25~55%。Nb2 O5 的含量的下限較佳為27%、更佳為29%。另外，Nb2 O5 的含量的上限較佳為53%，進一步以51%、49%、47%、40%、35%、33%的順序較佳。In the optical glass of the first embodiment that satisfies the above (B), the content of Nb 2 O 5 is 25 to 55%. The lower limit of the Nb 2 O 5 content is preferably 27%, more preferably 29%. In addition, the upper limit of the Nb 2 O 5 content is preferably 53%, and more preferably in the order of 51%, 49%, 47%, 40%, 35%, 33%.

Nb2 O5 是有助於高折射率化及高分散化的成分。因此，藉由將Nb2 O5 的含量設為上述範圍，可得到具有期望的光學常數的光學玻璃。另一方面，Nb2 O5 的含量過多時，存在玻璃的著色增強的擔憂。Nb 2 O 5 is a component that contributes to high refractive index and high dispersion. Therefore, by setting the content of Nb 2 O 5 in the above-mentioned range, an optical glass having a desired optical constant can be obtained. On the other hand, when the content of Nb 2 O 5 is too large, the coloring of the glass may increase.

接下來，對第1實施方式的光學玻璃的特性進行說明。Next, the characteristics of the optical glass of the first embodiment will be described.

在第1實施方式的光學玻璃中，100~300℃的平均線性熱膨脹係數α的下限較佳為100×10-7 ℃-1 ，進一步以105×10-7 ℃-1 、110×10-7 ℃-1 、115×10-7 ℃-1 、120×10-7 ℃-1 的順序更佳。另外，平均線性熱膨脹係數α的上限更佳為200×10-7 ℃-1 ，進一步以190×10-7 ℃-1 、180×10-7 ℃-1 、170×10-7 ℃-1 、160×10-7 ℃-1 的順序更佳。In the optical glass of the first embodiment, the lower limit of the average linear thermal expansion coefficient α at 100 to 300°C is preferably 100×10 -7 ℃ -1 , and further is 105×10 -7 ℃ -1 , 110×10 -7 The order of ℃ -1 , 115×10 -7 ℃ -1 , and 120×10 -7 ℃ -1 is better. In addition, the upper limit of the average linear thermal expansion coefficient α is more preferably 200×10 -7 ℃ -1 , and further is 190×10 -7 ℃ -1 , 180×10 -7 ℃ -1 , 170×10 -7 ℃ -1 , The order of 160×10 -7 ℃ -1 is better.

藉由將100~300℃的平均線性膨脹係數α設為上述範圍，可以抑制玻璃隨著熱膨脹的折射率的變化、即抑制相對折射率溫度係數dn/dT的增大。By setting the average linear expansion coefficient α of 100 to 300°C in the above range, it is possible to suppress the change in the refractive index of the glass with thermal expansion, that is, the increase in the relative refractive index temperature coefficient dn/dT.

平均線性膨脹係數α基於JOGIS08-2003的規定來測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定溫度和試樣的伸長率。 需要說明的是，在本說明書中，將平均線性膨脹係數α用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，平均線性膨脹係數α的數值也相同。The average linear expansion coefficient α is determined based on the regulations of JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. Determine the temperature and the elongation of the sample. It should be noted that in this specification, the average linear expansion coefficient α is expressed in the unit of [°C -1 ], but when [K -1 ] is used as the unit, the numerical value of the average linear expansion coefficient α is also the same.

在第1實施方式的光學玻璃中，在He-Ne雷射的波長(633nm)下的相對折射率溫度係數dn/dT在20~40℃的範圍內較佳為-1.0×10-6 ~-10.0×10-6 ℃-1 ，進一步以-1.5×10-6 ~-9.0×10-6 ℃-1 、-2.0×10-6 ~-8.0×10-6 ℃-1 、-2.5×10-6 ~-7.0×10-6 ℃-1 、-3.0×10-6 ~-6.5×10-6 ℃-1 的順序更佳。In the optical glass of the first embodiment, the relative refractive index temperature coefficient dn/dT at the wavelength of the He-Ne laser (633 nm) is preferably -1.0×10 -6 ~- in the range of 20 to 40°C. 10.0 × 10 -6 ℃ -1, further to -1.5 × 10 -6 ~ -9.0 × 10 -6 ℃ -1, -2.0 × 10 -6 ~ -8.0 × 10 -6 ℃ -1, -2.5 × 10 - The order of 6 ~-7.0×10 -6 ℃ -1 , -3.0×10 -6 ~-6.5×10 -6 ℃ -1 is better.

藉由將dn/dT設為上述範圍，並與dn/dT為正的光學元件組合，即使在光學元件的溫度大幅變動這樣的環境下，折射率的變動也小，因此，可以在更寬的溫度範圍中以高精度發揮期望的光學特性。By setting dn/dT in the above range and combining it with an optical element whose dn/dT is positive, even in an environment where the temperature of the optical element fluctuates greatly, the change in refractive index is small. Demonstrates the desired optical characteristics with high accuracy in the temperature range.

相對折射率溫度係數dn/dT基於JOGIS18-2008的干涉法來測定。 需要說明的是，在第1實施方式中，將溫度係數dn/dT用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，溫度係數dn/dT的數值也相同。The relative refractive index temperature coefficient dn/dT is measured based on the interferometry of JOGIS18-2008. It should be noted that in the first embodiment, the temperature coefficient dn/dT is expressed in the unit of [℃ -1 ], but when [K -1 ] is used as the unit, the value of the temperature coefficient dn/dT is also the same.

(玻璃成分) 對於第1實施方式的光學玻璃中的除上述以外的玻璃成分的含量及比率，以下示出非限定性的實例。(Glass composition) Regarding the content and ratio of glass components other than the above in the optical glass of the first embodiment, non-limiting examples are shown below.

在第1實施方式的光學玻璃中，SiO2 的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。SiO2 的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of SiO 2 is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The content of SiO 2 may also be 0%.

需要說明的是，有時在玻璃的熔融中使用石英玻璃製坩堝等石英玻璃製的熔融器具。在該情況下，由於少量的SiO2 從熔融器具熔入玻璃熔融物，因此，玻璃原料即使不含SiO2 ，製成的玻璃也會含有少量的SiO2 。從石英玻璃製的熔融器具混入玻璃的SiO2 的量也取決於熔融條件，例如相對於全部玻璃成分的含量的合計為0.5~1質量%左右。在除SiO2 以外的玻璃成分的含有比為恆定的狀態下，SiO2 的量增加0.5~1質量%左右。需要說明的是，根據熔解條件，上述量會有增減。根據SiO2 的含量不同，折射率、阿貝數等光學特性會變化，因此，可對除SiO2 以外的玻璃成分的含量進行微調而得到具有期望的光學特性的光學玻璃。It should be noted that a melting utensil made of quartz glass such as a crucible made of quartz glass may be used for melting of glass. In this case, since a small amount of SiO 2 is melted into the glass melt from the melting tool, even if the glass raw material does not contain SiO 2 , the produced glass will contain a small amount of SiO 2 . The amount of SiO 2 mixed into the glass from the melting tool made of quartz glass also depends on the melting conditions. For example, the total content of all glass components is about 0.5 to 1% by mass. In a state where the content ratio of glass components other than SiO 2 is constant, the amount of SiO 2 increases by about 0.5 to 1% by mass. It should be noted that the above amount may increase or decrease depending on the melting conditions. Depending on the content of SiO 2 , optical properties such as refractive index and Abbe number change. Therefore, the content of glass components other than SiO 2 can be finely adjusted to obtain optical glass having desired optical properties.

SiO2 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性、化學耐久性、耐候性、提高熔融玻璃的黏度、容易將熔融玻璃成型的作用。另一方面，SiO2 的含量多時，存在玻璃的耐失透性降低的傾向。因此，SiO2 的含量的上限較佳為上述範圍。SiO 2 is a network forming component of glass, and has the functions of improving the thermal stability, chemical durability, and weather resistance of glass, increasing the viscosity of molten glass, and facilitating molding of molten glass. On the other hand, when the content of SiO 2 is large, the devitrification resistance of the glass tends to decrease. Therefore, the upper limit of the content of SiO 2 is preferably the above range.

在第1實施方式中，Bi2 O3 的含量的上限較佳為15%，進一步以10%、7%、5%、3%的順序更佳。另外，Bi2 O3 的含量的下限較佳為0%。In the first embodiment, the upper limit of the content of Bi 2 O 3 is preferably 15%, and more preferably in the order of 10%, 7%, 5%, and 3%. In addition, the lower limit of the content of Bi 2 O 3 is preferably 0%.

藉由適量含有Bi2 O3 ，具有改善玻璃的熱穩定性的作用。另一方面，如果提高Bi2 O3 的含量，則玻璃的著色增大。因此，Bi2 O3 的含量較佳為上述範圍。By containing Bi 2 O 3 in an appropriate amount, it has the effect of improving the thermal stability of the glass. On the other hand, if the content of Bi 2 O 3 is increased, the coloration of the glass increases. Therefore, the content of Bi 2 O 3 is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，Ta2 O5 的含量的上限較佳為10%，進一步以7%、5%、3%的順序更佳。另外，Ta2 O5 的含量的下限較佳為0%。Ta2 O5 的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of Ta 2 O 5 is preferably 10%, and more preferably in the order of 7%, 5%, and 3%. In addition, the lower limit of the content of Ta 2 O 5 is preferably 0%. The content of Ta 2 O 5 may also be 0%.

Ta2 O5 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。另一方面，Ta2 O5 提高折射率，使玻璃高分散化。另外，Ta2 O5 的含量變多時，玻璃的熱穩定性降低，使玻璃熔融時，容易產生玻璃原料的熔融殘留物。因此，Ta2 O5 的含量較佳為上述範圍。此外，Ta2 O5 與其它玻璃成分相比，是非常昂貴的成分，Ta2 O5 的含量變多時，玻璃的生產成本增大。此外，Ta2 O5 與其它玻璃成分相比，分子量大，因此，會增大玻璃的比重，其結果，增大光學元件的重量。Ta 2 O 5 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. On the other hand, Ta 2 O 5 increases the refractive index and makes the glass highly dispersed. In addition, when the content of Ta 2 O 5 increases, the thermal stability of the glass decreases, and when the glass is melted, a molten residue of the glass raw material is likely to be generated. Therefore, the content of Ta 2 O 5 is preferably within the above-mentioned range. In addition, Ta 2 O 5 is a very expensive component compared to other glass components, and when the content of Ta 2 O 5 increases, the production cost of the glass increases. In addition, Ta 2 O 5 has a higher molecular weight than other glass components, and therefore increases the specific gravity of the glass, and as a result, increases the weight of the optical element.

在第1實施方式的光學玻璃中，Li2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。Li2 O的含量的下限較佳為0%。Li2 O的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of Li 2 O is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The lower limit of the content of Li 2 O is preferably 0%. The content of Li 2 O may also be 0%.

Li2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Li2 O的含量變多時，耐失透性降低。因此，Li2 O的含量較佳為上述範圍。Li 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Li 2 O increases, the devitrification resistance decreases. Therefore, the content of Li 2 O is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，K2 O的含量的下限較佳為1%，進一步以2%、3%、4%的順序更佳。另外，K2 O的含量的上限較佳為13%，進一步以12%、11%、10%的順序更佳。In the optical glass of the first embodiment, the lower limit of the K 2 O content is preferably 1%, and more preferably in the order of 2%, 3%, and 4%. In addition, the upper limit of the K 2 O content is preferably 13%, and more preferably in the order of 12%, 11%, and 10%.

K2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熱穩定性的作用，而且具有增大平均線性熱膨脹係數的作用。另一方面，K2 O的含量變多時，熱穩定性降低、玻璃化時容易產生條紋。因此，K2 O的含量較佳為上述範圍。K 2 O is a component that contributes to the low specific gravity of the glass, has the effect of improving the thermal stability of the glass, and has the effect of increasing the average linear thermal expansion coefficient. On the other hand, when the content of K 2 O increases, the thermal stability decreases and streaks tend to occur during vitrification. Therefore, the content of K 2 O is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，Cs2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。另外，Cs2 O的含量的下限較佳為0%。Cs2 O的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of Cs 2 O is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. In addition, the lower limit of the content of Cs 2 O is preferably 0%. The content of Cs 2 O may also be 0%.

Cs2 O具有改善玻璃的熔融性的作用，但含量變多時，玻璃的熱穩定性、折射率nd降低，而且在熔解中，玻璃成分的揮發增加，變得不能得到期望的玻璃。因此，Cs2 O的含量較佳為上述範圍。Cs 2 O has an effect of improving the meltability of the glass, but when the content increases, the thermal stability and refractive index nd of the glass decrease, and during melting, the volatilization of the glass component increases, and the desired glass cannot be obtained. Therefore, the content of Cs 2 O is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，MgO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，MgO的含量的下限較佳為0%。MgO的含量也可以為0%。In the optical glass of the first embodiment, the content of MgO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of MgO is preferably 0%. The content of MgO may also be 0%.

在第1實施方式的光學玻璃中，CaO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，CaO的含量的下限較佳為0%。CaO的含量也可以為0%。In the optical glass of the first embodiment, the content of CaO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of CaO is preferably 0%. The content of CaO may also be 0%.

在第1實施方式的光學玻璃中，SrO的含量較佳為6%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，SrO的含量的下限較佳為0%。In the optical glass of the first embodiment, the content of SrO is preferably 6% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of SrO is preferably 0%.

在第1實施方式的光學玻璃中，BaO的含量較佳為8%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，BaO的含量的下限較佳為0%。In the optical glass of the first embodiment, the content of BaO is preferably 8% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of BaO is preferably 0%.

MgO、CaO、SrO、BaO均為具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，這些玻璃成分的含量變多時，損害高分散性，而且玻璃的熱穩定性及耐失透性降低。因此，這些玻璃成分的各含量分別較佳為上述範圍。MgO, CaO, SrO, and BaO are all glass components that improve the thermal stability and devitrification resistance of glass. However, when the content of these glass components increases, high dispersibility is impaired, and the thermal stability and devitrification resistance of the glass decrease. Therefore, each content of these glass components is each preferably in the above-mentioned range.

在第1實施方式的光學玻璃中，ZnO的含量的上限較佳為10%，進一步以6%、4%、3%的順序更佳。較佳ZnO含量少的情況，其下限較佳為0%。ZnO的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of ZnO is preferably 10%, and more preferably in the order of 6%, 4%, and 3%. Preferably, when the content of ZnO is small, the lower limit is preferably 0%. The content of ZnO can also be 0%.

ZnO是具有改善玻璃的熱穩定性的作用玻璃成分。然而，ZnO的含量過多時，玻璃的比重增大。而且，相對折射率溫度係數(dn/dT)變高。因此，ZnO的含量較佳為上述範圍。ZnO is a glass component that has the effect of improving the thermal stability of glass. However, when the content of ZnO is too large, the specific gravity of the glass increases. Furthermore, the relative refractive index temperature coefficient (dn/dT) becomes higher. Therefore, the content of ZnO is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，ZrO2 的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，ZrO2 的含量的下限較佳為0%。In the optical glass of the first embodiment, the content of ZrO 2 is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of ZrO 2 is preferably 0%.

ZrO2 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，ZrO2 的含量過多時，顯示出熱穩定性降低的傾向。因此，ZrO2 的含量較佳為上述範圍。ZrO 2 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. However, when the content of ZrO 2 is too large, the thermal stability tends to decrease. Therefore, the content of ZrO 2 is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，Sc2 O3 的含量的上限較佳為2%。另外，Sc2 O3 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of Sc 2 O 3 is preferably 2%. In addition, the lower limit of the content of Sc 2 O 3 is preferably 0%.

在第1實施方式的光學玻璃中，HfO2 的含量的上限較佳為2%。另外，HfO2 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of HfO 2 is preferably 2%. In addition, the lower limit of the content of HfO 2 is preferably 0%.

Sc2 O3 、HfO2 均具有提高折射率nd的作用，而且是昂貴的成分。因此，Sc2 O3 、HfO2 的各含量較佳為上述範圍。Both Sc 2 O 3 and HfO 2 have the effect of increasing the refractive index nd, and are expensive components. Therefore, the respective contents of Sc 2 O 3 and HfO 2 are preferably within the above-mentioned ranges.

在第1實施方式的光學玻璃中，Lu2 O3 的含量的上限較佳為2%。另外，Lu2 O3 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of Lu 2 O 3 is preferably 2%. In addition, the lower limit of the content of Lu 2 O 3 is preferably 0%.

Lu2 O3 具有提高折射率nd的作用。另外，其分子量大，因此也是增加玻璃的比重的玻璃成分。因此，Lu2 O3 的含量較佳為上述範圍。Lu 2 O 3 has the effect of increasing the refractive index nd. In addition, since its molecular weight is large, it is also a glass component that increases the specific gravity of glass. Therefore, the content of Lu 2 O 3 is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，GeO2 的含量的上限較佳為2%。另外，GeO2 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of GeO 2 is preferably 2%. In addition, the lower limit of the content of GeO 2 is preferably 0%.

GeO2 具有提高折射率nd的作用，而且是在通常使用的玻璃成分中特別地昂貴的成分。因此，從降低玻璃的製造成本的觀點考慮，GeO2 的含量較佳為上述範圍。GeO 2 has the effect of increasing the refractive index nd, and is a particularly expensive component among glass components commonly used. Therefore, from the viewpoint of reducing the manufacturing cost of glass, the content of GeO 2 is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，La2 O3 的含量的上限較佳為2%。另外，La2 O3 的含量的下限較佳為0%。La2 O3 的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of La 2 O 3 is preferably 2%. In addition, the lower limit of the content of La 2 O 3 is preferably 0%. The content of La 2 O 3 may also be 0%.

La2 O3 的含量變多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，La2 O3 的含量較佳為上述範圍。When the content of La 2 O 3 increases, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. Therefore, the content of La 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and resistance to devitrification.

在第1實施方式的光學玻璃中，Gd2 O3 的含量的上限較佳為2%。另外，Gd2 O3 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of Gd 2 O 3 is preferably 2%. In addition, the lower limit of the content of Gd 2 O 3 is preferably 0%.

Gd2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。另外，Gd2 O3 的含量過多時，玻璃的比重增大而不佳。因此，從良好地保持玻璃的熱穩定性及耐失透性、同時抑制比重的增大的觀點考慮，Gd2 O3 的含量較佳為上述範圍。When the content of Gd 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. In addition, when the content of Gd 2 O 3 is too large, the specific gravity of the glass increases and is unfavorable. Therefore, from the viewpoint of maintaining the thermal stability and devitrification resistance of the glass while suppressing an increase in specific gravity, the content of Gd 2 O 3 is preferably within the above-mentioned range.

在第1實施方式的光學玻璃中，Y2 O3 的含量的上限較佳為2%。另外，Y2 O3 的含量的下限較佳為0%。Y2 O3 的含量也可以為0%。In the optical glass of the first embodiment, the upper limit of the content of Y 2 O 3 is preferably 2%. In addition, the lower limit of the content of Y 2 O 3 is preferably 0%. The content of Y 2 O 3 may also be 0%.

Y2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，Y2 O3 的含量較佳為上述範圍。When the content of Y 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. Therefore, the content of Y 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and devitrification resistance.

在第1實施方式的光學玻璃中，Yb2 O3 的含量的上限較佳為2%。另外，Yb2 O3 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the content of Yb 2 O 3 is preferably 2%. In addition, the lower limit of the content of Yb 2 O 3 is preferably 0%.

Yb2 O3 與La2 O3 、Gd2 O3 、Y2 O3 相比，分子量大，因此，會增大玻璃的比重。玻璃的比重增大時，光學元件的質量增大。例如，如果將質量大的透鏡導入自動對焦式的攝像透鏡，則自動對焦時，透鏡的驅動所需的電力增大，電池的消耗變得嚴重。因此，期望減少Yb2 O3 的含量，抑制玻璃的比重的增大。Yb 2 O 3 has a larger molecular weight than La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 and therefore increases the specific gravity of glass. As the specific gravity of the glass increases, the quality of the optical element increases. For example, if a high-quality lens is introduced into an auto-focusing type imaging lens, the power required for driving the lens increases during auto-focusing, and the battery consumption becomes serious. Therefore, it is desirable to reduce the content of Yb 2 O 3 and suppress an increase in the specific gravity of the glass.

另外，Yb2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。從防止玻璃的熱穩定性的降低、抑制比重的增大的觀點考慮，Yb2 O3 的含量較佳為上述範圍。In addition, when the content of Yb 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. From the viewpoints of preventing a decrease in the thermal stability of the glass and suppressing an increase in specific gravity, the content of Yb 2 O 3 is preferably within the above-mentioned range.

較佳為滿足上述(A)的第1實施方式的光學玻璃主要以上述的玻璃成分、即作為必要成分的P2 O5 、Nb2 O5 、B2 O3 、作為任意成分的WO3 、SiO2 、Al2 O3 、TiO2 、Bi2 O3 、Ta2 O5 、Li2 O、Na2 O、K2 O、Cs2 O、MgO、CaO、SrO、BaO、ZnO、ZrO2 、Sc2 O3 、HfO2 、Lu2 O3 、GeO2 、La2 O3 、Gd2 O3 、Y2 O3 、及Yb2 O3 構成，上述的玻璃成分的合計含量較佳為95%以上、更佳為98%以上、進一步較佳為99%以上、更進一步較佳為99.5%以上。It is preferable that the optical glass of the first embodiment satisfying the above-mentioned (A) mainly contains the above-mentioned glass components, that is, P 2 O 5 , Nb 2 O 5 , B 2 O 3 as essential components, and WO 3 , as optional components. SiO 2 , Al 2 O 3 , TiO 2 , Bi 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, K 2 O, Cs 2 O, MgO, CaO, SrO, BaO, ZnO, ZrO 2 , It is composed of Sc 2 O 3 , HfO 2 , Lu 2 O 3 , GeO 2 , La 2 O 3 , Gd 2 O 3 , Y 2 O 3 , and Yb 2 O 3. The total content of the above-mentioned glass components is preferably 95% Above, more preferably 98% or more, still more preferably 99% or more, and still more preferably 99.5% or more.

另外，較佳為滿足上述(B)的第1實施方式的光學玻璃主要以上述的玻璃成分、即作為必要成分的P2 O5 、Nb2 O5 、作為任意成分的B2 O3 、WO3 、SiO2 、Al2 O3 、TiO2 、Bi2 O3 、Ta2 O5 、Li2 O、Na2 O、K2 O、Cs2 O、MgO、CaO、SrO、BaO、ZnO、ZrO2 、Sc2 O3 、HfO2 、Lu2 O3 、GeO2 、La2 O3 、Gd2 O3 、Y2 O3 、及Yb2 O3 構成，上述的玻璃成分的合計含量較佳為95%以上、更佳為98%以上、進一步較佳為99%以上、更進一步較佳為99.5%以上。In addition, it is preferable that the optical glass of the first embodiment satisfying the above-mentioned (B) mainly contains the above-mentioned glass components, that is, P 2 O 5 and Nb 2 O 5 as essential components, and B 2 O 3 and WO as optional components. 3. SiO 2 , Al 2 O 3 , TiO 2 , Bi 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, K 2 O, Cs 2 O, MgO, CaO, SrO, BaO, ZnO, ZrO 2. The composition of Sc 2 O 3 , HfO 2 , Lu 2 O 3 , GeO 2 , La 2 O 3 , Gd 2 O 3 , Y 2 O 3 , and Yb 2 O 3 , the total content of the above glass components is preferably 95% or more, more preferably 98% or more, still more preferably 99% or more, still more preferably 99.5% or more.

在第1實施方式的光學玻璃中，TeO2 的含量的上限較佳為2%。另外，TeO2 的含量的下限較佳為0%。In the optical glass of the first embodiment, the upper limit of the TeO 2 content is preferably 2%. In addition, the lower limit of the TeO 2 content is preferably 0%.

由於TeO2 具有毒性，因此，較佳減少TeO2 的含量。因此，TeO2 的含量較佳為上述範圍。Since TeO 2 is toxic, it is better to reduce the content of TeO 2. Therefore, the content of TeO 2 is preferably within the above-mentioned range.

需要說明的是，第1實施方式的光學玻璃基本上由上述玻璃成分構成，但在不妨礙本發明的作用效果的範圍內，也可以含有其它成分。另外，在本發明中，不排除含有不可避免的雜質。It should be noted that the optical glass of the first embodiment is basically composed of the above-mentioned glass components, but may contain other components within a range that does not hinder the effects of the present invention. In addition, in the present invention, the inclusion of unavoidable impurities is not excluded.

＜其它成分組成＞ Pb、As、Cd、Tl、Be、Se均具有毒性。因此，較佳為第1實施方式的光學玻璃不含這些元素作為玻璃成分。＜Other component composition＞ Pb, As, Cd, Tl, Be, and Se are all toxic. Therefore, it is preferable that the optical glass of the first embodiment does not contain these elements as glass components.

U、Th、Ra均為放射性元素。因此，較佳為第1實施方式的光學玻璃不含這些元素作為玻璃成分。U, Th, and Ra are all radioactive elements. Therefore, it is preferable that the optical glass of the first embodiment does not contain these elements as glass components.

V、Cr、Mn、Fe、Co、Ni、Cu、Pr、Nd、Pm、Sm、Eu、Tb、Dy、Ho、Er、Tm可以增大玻璃的著色、成為螢光的發生源。因此，較佳為第1實施方式的光學玻璃不含這些元素作為玻璃成分。V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm can increase the coloring of glass and become a source of fluorescence. Therefore, it is preferable that the optical glass of the first embodiment does not contain these elements as glass components.

Sb(Sb2 O3 )、Ce(CeO2 )是作為澄清劑發揮功能的可以任意添加的元素。其中，Sb(Sb2 O3 )是澄清效果大的澄清劑。然而，Sb(Sb2 O3 )的氧化性強，如果增加Sb(Sb2 O3 )的添加量，則由於由Sb離子導致的光吸收，玻璃的著色增大而不佳。另外，將玻璃熔融時，如果熔融物中存在Sb，則促進構成玻璃熔融坩堝的鉑對熔融物的溶出，玻璃中的鉑濃度變高。在玻璃中，鉑以離子的形式存在時，由於光的吸收，玻璃的著色增大。另外，在玻璃中，鉑以固體物質的形式存在時，成為光的散射源，會降低玻璃的品質。Ce(CeO2 )與Sb(Sb2 O3 )相比，澄清效果小。如果大量添加Ce(CeO2 )，則玻璃的著色增強。因此，在添加澄清劑的情況下，較佳為一邊注意添加量一邊添加Sb(Sb2 O3 )。Sb(Sb 2 O 3 ) and Ce(CeO 2 ) are arbitrarily added elements that function as fining agents. Among them, Sb (Sb 2 O 3 ) is a clarifying agent with a large clarifying effect. However, Sb (Sb 2 O 3 ) is highly oxidizing. If the addition amount of Sb (Sb 2 O 3 ) is increased, the coloration of the glass increases due to the light absorption caused by Sb ions. In addition, when the glass is melted, if Sb is present in the melt, the elution of the platinum constituting the glass melting crucible into the melt is promoted, and the platinum concentration in the glass becomes higher. In glass, when platinum exists in the form of ions, the color of the glass increases due to the absorption of light. In addition, when platinum exists in the form of a solid substance in glass, it becomes a scattering source of light and degrades the quality of the glass. Ce(CeO 2 ) has a smaller clarifying effect than Sb(Sb 2 O 3 ). If Ce(CeO 2 ) is added in a large amount, the coloring of the glass is enhanced. Therefore, when adding a clarifier, it is preferable to add Sb (Sb 2 O 3 ) while paying attention to the addition amount.

將Sb2 O3 的含量設為外加比例表示。即，將除Sb2 O3 及CeO2 以外的全部玻璃成分的合計含量設為100質量%時，Sb2 O3 的含量較佳小於1質量%、更佳小於0.1質量%，進一步以小於0.05質量%、小於0.03質量%、小於0.02質量%的順序較佳。Sb2 O3 的含量也可以為0質量%。The content of Sb 2 O 3 is expressed as an additional ratio. That is, when the total content of all glass components excluding Sb 2 O 3 and CeO 2 is 100% by mass, the content of Sb 2 O 3 is preferably less than 1% by mass, more preferably less than 0.1% by mass, and further less than 0.05. The order of mass%, less than 0.03% by mass, and less than 0.02% by mass is preferable. The content of Sb 2 O 3 may be 0% by mass.

將CeO2 的含量也設為外加比例表示。即，將除CeO2 、Sb2 O3 以外的全部玻璃成分的合計含量設為100質量%時，CeO2 的含量較佳小於2質量%、更佳小於1質量%、進一步較佳小於0.5質量%、更進一步較佳小於0.1質量%的範圍。CeO2 的含量也可以為0質量%。藉由將CeO2 的含量設為上述範圍，可以改善玻璃的澄清性。The content of CeO 2 is also expressed as an additional ratio. That is, when the total content of all glass components except CeO 2 and Sb 2 O 3 is 100% by mass, the content of CeO 2 is preferably less than 2% by mass, more preferably less than 1% by mass, and still more preferably less than 0.5% by mass. %. More preferably, the range is less than 0.1% by mass. The content of CeO 2 may also be 0% by mass. By setting the content of CeO 2 in the above range, the clarity of the glass can be improved.

(玻璃特性) ＜玻璃化轉變溫度Tg＞ 第1實施方式的光學玻璃的玻璃化轉變溫度Tg較佳為570℃以下，進一步以560℃以下、550℃以下、540℃以下、530℃以下的順序更佳。(Glass characteristics) ＜Glass transition temperature Tg＞ The glass transition temperature Tg of the optical glass of the first embodiment is preferably 570°C or lower, and more preferably in the order of 560°C or lower, 550°C or lower, 540°C or lower, and 530°C or lower.

藉由使玻璃化轉變溫度Tg的上限滿足上述範圍，可以抑制玻璃的成型溫度及退火溫度的上升，可以降低熱對壓製成型用設備及退火設備的損傷。另外，藉由使玻璃化轉變溫度Tg的下限滿足上述範圍，容易在保持期望的阿貝數、折射率的同時良好地保持玻璃的熱穩定性。When the upper limit of the glass transition temperature Tg satisfies the above range, it is possible to suppress the increase in the molding temperature and annealing temperature of the glass, and it is possible to reduce the damage to the press molding equipment and the annealing equipment due to heat. In addition, by making the lower limit of the glass transition temperature Tg satisfy the above-mentioned range, it is easy to maintain the thermal stability of the glass while maintaining the desired Abbe number and refractive index.

＜玻璃的比重＞ 在第1實施方式的光學玻璃中，比重較佳為3.60以下，進一步以3.50以下、3.40以下的順序更佳。如果能夠減少玻璃的比重，則可以減少透鏡的重量。其結果，可以降低搭載透鏡的相機透鏡的自動對焦驅動的消耗電力。＜Specific gravity of glass＞ In the optical glass of the first embodiment, the specific gravity is preferably 3.60 or less, and more preferably 3.50 or less and 3.40 or less in this order. If the specific gravity of the glass can be reduced, the weight of the lens can be reduced. As a result, it is possible to reduce the power consumption of the autofocus drive of the lens-mounted camera lens.

＜玻璃的透光性＞ 第1實施方式的光學玻璃的透光性可以藉由著色度λ5來評價。 對於厚度10.0mm±0.1mm的玻璃試樣，在波長200~700nm的範圍內測定分光透射率，將外部透射率成為5%的波長設為λ5。＜Transmittance of glass＞ The light transmittance of the optical glass of the first embodiment can be evaluated by the coloring degree λ5. For a glass sample with a thickness of 10.0 mm±0.1 mm, the spectral transmittance is measured in a wavelength range of 200 to 700 nm, and the wavelength at which the external transmittance becomes 5% is set to λ5.

第1實施方式的光學玻璃的λ5較佳為400nm以下，更佳為380nm以下、進一步較佳為370nm以下。The λ5 of the optical glass of the first embodiment is preferably 400 nm or less, more preferably 380 nm or less, and still more preferably 370 nm or less.

藉由使用將λ5短波長化後的光學玻璃，可以提供可實現適宜的顏色再現的光學元件。By using optical glass whose wavelength has been shortened to λ5, it is possible to provide optical elements that can achieve appropriate color reproduction.

(光學玻璃的製造) 本發明的實施方式的光學玻璃以達到上述預定組成的方式調配玻璃原料，利用調配的玻璃原料、按照公知的玻璃製造方法製作即可。例如，調配多種化合物，充分混合而製成批原料，將批原料放入石英坩堝、或鉑坩堝中進行粗熔解(rough melt)。將粗熔解得到的熔融物驟冷、粉碎，製作碎玻璃。進一步將碎玻璃放入鉑坩堝中進行加熱、再熔融(remelt)，製成熔融玻璃，進一步在進行了澄清、均質化後，將熔融玻璃成型，進行緩慢冷卻，得到光學玻璃。熔融玻璃的成型、緩慢冷卻採用公知的方法即可。(Manufacturing of optical glass) The optical glass of the embodiment of the present invention may be prepared by blending glass raw materials so as to achieve the above-mentioned predetermined composition, and using the blended glass raw materials according to a known glass manufacturing method. For example, a variety of compounds are prepared and mixed thoroughly to form batch materials, and the batch materials are put into a quartz crucible or a platinum crucible for rough melt. The melt obtained by the rough melting is quenched and crushed to produce cullet. Furthermore, the cullet was put into a platinum crucible and heated and remelt (remelt) to prepare a molten glass. After further clarification and homogenization, the molten glass was molded and slowly cooled to obtain an optical glass. A known method may be used for molding and slow cooling of molten glass.

需要說明的是，只要能在玻璃中導入期望的玻璃成分、並使其達到期望的含量，則對調配批原料時使用的化合物就沒有特別限定，作為這樣的化合物，可列舉氧化物、碳酸鹽、硝酸鹽、氫氧化物、氟化物等。It should be noted that as long as the desired glass component can be introduced into the glass and the desired content is achieved, there are no particular limitations on the compound used when preparing batch materials. Examples of such compounds include oxides and carbonates. , Nitrate, hydroxide, fluoride, etc.

(光學元件等製造) 使用本發明的實施方式的光學玻璃製作光學元件時，採用公知的方法即可。例如，將玻璃原料熔融，製成熔融玻璃，將該熔融玻璃注入鑄模而成型為板狀，製作由本發明的光學玻璃形成的玻璃材料。將得到的玻璃材料適當地切割、磨削、研磨，製作適於壓製成型的大小、形狀的碎片。將碎片加熱、軟化，藉由公知的方法進行壓製成型(再熱壓)，製作近似於光學元件的形狀的光學元件坯料。對光學元件坯料進行退火，藉由公知的方法進行磨削、研磨而製作光學元件。(Manufacturing of optical components, etc.) When an optical element is produced using the optical glass of the embodiment of the present invention, a known method may be used. For example, a glass raw material is melted to make molten glass, and the molten glass is poured into a mold to shape it into a plate shape to produce a glass material made of the optical glass of the present invention. The obtained glass material is appropriately cut, ground, and ground to produce fragments of a size and shape suitable for press molding. The fragments are heated and softened, and then press-molded (re-hot-pressed) by a known method to produce an optical element blank having a shape similar to the optical element. The optical element blank is annealed and ground and polished by a known method to produce an optical element.

根據使用目的，可以在製作的光學元件的光學功能面塗佈防反射膜、全反射膜等。According to the purpose of use, an anti-reflection film, a total reflection film, etc. may be coated on the optically functional surface of the optical element produced.

作為光學元件，可示例出球面透鏡等各種透鏡、棱鏡、繞射光柵等。As the optical element, various lenses such as spherical lenses, prisms, diffraction gratings, and the like can be exemplified.

第2實施方式 對第2實施方式的光學玻璃詳細地進行說明。 第2實施方式的光學玻璃的P2 O5 的含量為25~50質量%， TiO2 的含量為10~50質量%， Nb2 O5 含量為5~30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60質量%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， 且滿足下述(A)或(B)： (A) WO3 的含量為7質量%以下； (B) 實質上不含F。The second embodiment will describe the optical glass of the second embodiment in detail. In the optical glass of the second embodiment , the content of P 2 O 5 is 25-50% by mass, the content of TiO 2 is 10-50% by mass, the content of Nb 2 O 5 is 5-30% by mass, TiO 2 , Nb 2 O 5. The total content of WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60% by mass, and the content of TiO 2 is relative to TiO 2 The mass ratio of the total content of, Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 or more , The mass ratio of the total content of P 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.80 or less, and satisfies the following (A) or (B): (A) The content of WO 3 is 7 mass% or less; (B) substantially no Contains F.

以下，只要沒有特別記載，第2實施方式的光學玻璃是指滿足上述(A)的第2實施方式的光學玻璃及滿足上述(B)的第2實施方式的光學玻璃。Hereinafter, unless otherwise stated, the optical glass of the second embodiment refers to the optical glass of the second embodiment satisfying the above (A) and the optical glass of the second embodiment satisfying the above (B).

在第2實施方式的光學玻璃中，P2 O5 的含量為25~50%。P2 O5 的含量的下限較佳為27%，進一步以29%、31%、32%的順序更佳。另外，P2 O5 的含量的上限較佳為42%，進一步以40%、38%、37%、36%的順序更佳。In the optical glass of the second embodiment, the content of P 2 O 5 is 25 to 50%. The lower limit of the content of P 2 O 5 is preferably 27%, and more preferably in the order of 29%, 31%, and 32%. In addition, the upper limit of the content of P 2 O 5 is preferably 42%, and more preferably in the order of 40%, 38%, 37%, and 36%.

P2 O5 是玻璃的網絡形成成分，是為了在玻璃中大量含有高分散成分的必要成分。藉由將P2 O5 的含量設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。P 2 O 5 is a network-forming component of glass, and is an essential component in order to contain a large amount of highly dispersed components in the glass. By setting the content of P 2 O 5 in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在第2實施方式的光學玻璃中，TiO2 的含量為10~50%。TiO2 的含量的下限較佳為12%，進一步以14%、15%、16%、17%的順序更佳。另外，TiO2 的含量的上限較佳為40%，進一步以35%、30%、28%、26%、24%、23%的順序更佳。In the optical glass of the second embodiment, the content of TiO 2 is 10 to 50%. The lower limit of the content of TiO 2 is preferably 12%, and more preferably in the order of 14%, 15%, 16%, and 17%. In addition, the upper limit of the content of TiO 2 is preferably 40%, and more preferably in the order of 35%, 30%, 28%, 26%, 24%, and 23%.

TiO2 特別有助於高分散化。另一方面，TiO2 比較容易增大玻璃的著色，而且存在容易使熔融性惡化的擔憂。因此，TiO2 的含量較佳為上述範圍。TiO 2 particularly contributes to high dispersion. On the other hand, TiO 2 is relatively easy to increase the coloration of the glass, and there is a concern that it is likely to deteriorate the meltability. Therefore, the content of TiO 2 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Nb2 O5 的含量為5~30%。Nb2 O5 的含量的下限較佳為10%，進一步以12%、14%、16%、17%、18%的順序更佳。另外，Nb2 O5 的含量的上限較佳為28%，進一步以27%、26%、25%的順序更佳。In the optical glass of the second embodiment, the content of Nb 2 O 5 is 5 to 30%. The lower limit of the content of Nb 2 O 5 is preferably 10%, and more preferably in the order of 12%, 14%, 16%, 17%, and 18%. In addition, the upper limit of the Nb 2 O 5 content is preferably 28%, and more preferably in the order of 27%, 26%, and 25%.

Nb2 O5 是有助於高折射率化及高分散化的成分。因此，藉由將Nb2 O5 的含量設為上述範圍，可得到具有期望的光學常數的光學玻璃。另一方面，Nb2 O5 的含量過多時，存在玻璃的著色增強的擔憂。Nb 2 O 5 is a component that contributes to high refractive index and high dispersion. Therefore, by setting the content of Nb 2 O 5 in the above-mentioned range, an optical glass having a desired optical constant can be obtained. On the other hand, when the content of Nb 2 O 5 is too large, the coloring of the glass may increase.

在第2實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60%。該合計含量的下限較佳為36%，進一步以37%、38%、39%的順序更佳。另外，該合計含量的上限較佳為55%，進一步以50%、47%、45%、44%的順序更佳。In the optical glass of the second embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] Is 35~60%. The lower limit of the total content is preferably 36%, and more preferably in the order of 37%, 38%, and 39%. In addition, the upper limit of the total content is preferably 55%, and more preferably in the order of 50%, 47%, 45%, and 44%.

TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 是有助於玻璃的高分散化的成分。因此，藉由將合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]設為上述範圍，可得到具有期望的光學常數的光學玻璃。而且，還可以改善玻璃的熱穩定性。另一方面，該合計含量過多時，存在不能得到具有期望的光學常數的光學玻璃的擔憂，而且，存在玻璃的熱穩定性降低、玻璃的著色變強的擔憂。TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 are components that contribute to the high dispersion of glass. Therefore, by setting the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 ] in the above range, an optical glass having a desired optical constant can be obtained. Moreover, the thermal stability of the glass can also be improved. On the other hand, when the total content is too large, there is a concern that an optical glass having a desired optical constant cannot be obtained, and the thermal stability of the glass is lowered, and the coloring of the glass becomes strong.

在第2實施方式的光學玻璃中，TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。該質量比的下限較佳為0.30，進一步以0.32、0.34、0.36、0.38、0.40的順序更佳。另外，該質量比的上限較佳為0.65，進一步以0.60、0.58、0.56的順序更佳。In the optical glass of the second embodiment, the content of TiO 2 is relative to the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 The mass ratio of O 3 +Ta 2 O 5 [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is 0.25 or more. The lower limit of the mass ratio is preferably 0.30, and more preferably in the order of 0.32, 0.34, 0.36, 0.38, and 0.40. In addition, the upper limit of the mass ratio is preferably 0.65, and more preferably in the order of 0.60, 0.58, and 0.56.

TiO2 是高折射率化成分中，高分散化的作用特別大的成分。因此，從得到期望的光學常數的觀點考慮，質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]較佳為上述範圍。TiO 2 is a component that has a particularly large effect on high dispersion among components that increase refractive index. Therefore, from the viewpoint of obtaining desired optical constants, the mass ratio [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is preferably in the above-mentioned range.

在第2實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下。該質量比的上限較佳為1.75，進一步以1.73、1.72、1.71、1.70的順序更佳。另外，該質量比的下限較佳為1.20，進一步以1.30、1.35、1.38、1.40的順序更佳。In the optical glass of the second embodiment, the mass ratio of the total content of P 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [( P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.80 or less. The upper limit of the mass ratio is preferably 1.75, and more preferably in the order of 1.73, 1.72, 1.71, and 1.70. In addition, the lower limit of the mass ratio is preferably 1.20, and more preferably in the order of 1.30, 1.35, 1.38, and 1.40.

藉由將質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，可得到熱穩定性高、相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃。By setting the mass ratio [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] to the above range, high thermal stability and relative refractive index temperature coefficient (dn /dT) Optical glass with low average linear thermal expansion coefficient.

在滿足上述(A)的第2實施方式的光學玻璃中，WO3 的含量為7%以下。WO3 的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。較佳為WO3 的含量少的情況，其下限較佳為0%。WO3 的含量也可以為0%。In the optical glass of the second embodiment that satisfies the above (A), the content of WO 3 is 7% or less. The upper limit of the content of WO 3 is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. Preferably, when the content of WO 3 is small, the lower limit is preferably 0%. The content of WO 3 may also be 0%.

在滿足上述(B)的第2實施方式的光學玻璃中，WO3 的含量較佳為15%以下，其上限以10%、5%、3%的順序更佳。較佳WO3 的含量少的情況，其下限較佳為0%。WO3 的含量也可以為0%。In the optical glass of the second embodiment that satisfies the above (B), the content of WO 3 is preferably 15% or less, and the upper limit thereof is more preferably in the order of 10%, 5%, and 3%. Preferably , when the content of WO 3 is small, the lower limit is preferably 0%. The content of WO 3 may also be 0%.

藉由將WO3 的含量設為上述範圍，可以提高透射率，而且可以抑制玻璃的比重的增大。另外，可以降低相對折射率溫度係數(dn/dT)。By setting the content of WO 3 in the above-mentioned range, the transmittance can be improved, and an increase in the specific gravity of the glass can be suppressed. In addition, the relative refractive index temperature coefficient (dn/dT) can be reduced.

在滿足上述(A)的第2實施方式的光學玻璃中，氟F的含量較佳為3%以下，其上限以1%、0.5%、0.3%的順序更佳。較佳為F的含量少的情況，其下限較佳為0%。F的含量也可以為0%。In the optical glass of the second embodiment that satisfies the above (A), the content of fluorine F is preferably 3% or less, and the upper limit thereof is more preferably in the order of 1%, 0.5%, and 0.3%. Preferably, when the content of F is small, the lower limit is preferably 0%. The content of F may also be 0%.

滿足上述(B)的第2實施方式的光學玻璃實質上不含氟F。The optical glass of the second embodiment that satisfies the above (B) does not substantially contain fluorine F.

藉由將F的含量設為上述範圍，可以抑制玻璃在熔解中的揮發，可以抑制折射率的變動、條紋。By setting the content of F in the above range, volatilization of the glass during melting can be suppressed, and fluctuations in refractive index and streaks can be suppressed.

對於第2實施方式的光學玻璃中的除上述以外的玻璃成分的含量及比率，以下示出非限定性的實例。Regarding the content and ratio of glass components other than the above in the optical glass of the second embodiment, non-limiting examples are shown below.

在第2實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]較佳為1.10以下。該質量比的上限較佳為1.00，進一步以0.95、0.90、0.85、0.82、0.80的順序更佳。另外，該質量比的下限更佳為0.50，進一步以0.55、0.60、0.62、0.64的順序更佳。In the optical glass of the second embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 The mass ratio of the total content of O 3 , Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 +SiO 2 +Al 2 O 3 +Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is preferably 1.10 or less. The upper limit of the mass ratio is preferably 1.00, and more preferably in the order of 0.95, 0.90, 0.85, 0.82, 0.80. In addition, the lower limit of the mass ratio is more preferably 0.50, and further more preferably in the order of 0.55, 0.60, 0.62, and 0.64.

藉由將質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，容易得到具有期望的光學常數的光學玻璃。By changing the mass ratio [(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )/(P 2 O 5 +B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O) ] When it is set to the above range, it is easy to obtain an optical glass having a desired optical constant.

在第2實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]較佳為0.70以下。該質量比的上限較佳為0.68，進一步以0.67、0.66、0.65的順序更佳。該質量比的下限較佳為0.25，進一步以0.35、0.40、0.45的順序更佳。In the optical glass of the second embodiment, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3)] is preferably 0.70 the following. The upper limit of the mass ratio is preferably 0.68, and more preferably in the order of 0.67, 0.66, and 0.65. The lower limit of the mass ratio is preferably 0.25, and more preferably in the order of 0.35, 0.40, and 0.45.

藉由將質量比[TiO2 /(P2 O5 ＋B2 O3 )]設為上述範圍，容易得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /(P 2 O 5 +B 2 O 3 )] to the above range, it is easy to obtain an optical glass having a desired optical constant and high thermal stability.

在第2實施方式的光學玻璃中，B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]較佳為0.39以下。該質量比的上限更佳為0.20，進一步以0.15、0.12、0.10、0.08、0.07、0.06的順序更佳。In the optical glass of the second embodiment, the mass ratio [B 2 O 3 /P 2 O 5 ] of the content of B 2 O 3 to the content of P 2 O 5 is preferably 0.39 or less. The upper limit of the mass ratio is more preferably 0.20, and further more preferably in the order of 0.15, 0.12, 0.10, 0.08, 0.07, and 0.06.

藉由將質量比[B2 O3 /P2 O5 ]設為上述範圍，容易得到具有期望的光學常數、熱穩定性高、且耐失透性高的光學玻璃。By setting the mass ratio [B 2 O 3 /P 2 O 5 ] to the above range, it is easy to obtain an optical glass having a desired optical constant, high thermal stability, and high devitrification resistance.

在第2實施方式的光學玻璃中，MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0%以下。該合計含量的上限較佳為6%，進一步以5%、4%、3%的順序更佳。另外，該合計含量的下限較佳為0%。In the optical glass of the second embodiment, the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is 8.0% or less. The upper limit of the total content is preferably 6%, and more preferably in the order of 5%, 4%, and 3%. In addition, the lower limit of the total content is preferably 0%.

藉由將合計含量[MgO＋CaO＋SrO＋BaO]設為上述範圍，可以促進高分散化。By setting the total content [MgO+CaO+SrO+BaO] in the above range, high dispersion can be promoted.

在第2實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 的含量的質量比[TiO2 /P2 O5 ]的上限較佳為0.70，進一步以0.68、0.66、0.65的順序更佳。該質量比的下限較佳為0.25，進一步以0.35、0.40、0.45的順序更佳。In the optical glass of the second embodiment, the upper limit of the mass ratio [TiO 2 /P 2 O 5 ] of the content of TiO 2 to the content of P 2 O 5 is preferably 0.70, and further in the order of 0.68, 0.66, and 0.65 Better. The lower limit of the mass ratio is preferably 0.25, and more preferably in the order of 0.35, 0.40, and 0.45.

藉由將質量比[TiO2 /P2 O5 ]設為上述範圍，容易得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /P 2 O 5 ] to the above range, it is easy to obtain an optical glass having a desired optical constant and high thermal stability.

在第2實施方式的光學玻璃中，B2 O3 的含量的上限較佳為10%，進一步以7%、5%、3%、2%的順序更佳。B2 O3 的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of B 2 O 3 is preferably 10%, and more preferably in the order of 7%, 5%, 3%, and 2%. The content of B 2 O 3 may also be 0%.

B2 O3 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性的作用。另一方面，B2 O3 的含量多時，存在耐失透性降低的傾向。因此，B2 O3 的含量較佳為上述範圍。B 2 O 3 is a network forming component of glass and has the effect of improving the thermal stability of glass. On the other hand, when the content of B 2 O 3 is large, the devitrification resistance tends to decrease. Therefore, the content of B 2 O 3 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Al2 O3 的含量較佳為3%以下，進一步以2%以下、1%以下的順序更佳。Al2 O3 的含量也可以為0%。In the optical glass of the second embodiment, the content of Al 2 O 3 is preferably 3% or less, and more preferably in the order of 2% or less and 1% or less. The content of Al 2 O 3 may also be 0%.

Al2 O3 是具有改善玻璃的化學耐久性、耐候性的作用的玻璃成分，可以將其視為網絡形成成分。另一方面，Al2 O3 的含量變多時，玻璃的耐失透性降低。另外，容易發生玻璃化轉變溫度Tg上升、熱穩定性降低等問題。從避免這樣的問題的觀點考慮，Al2 O3 的含量的上限較佳為上述範圍。Al 2 O 3 is a glass component that has the effect of improving the chemical durability and weather resistance of glass, and it can be regarded as a network forming component. On the other hand, when the content of Al 2 O 3 increases, the devitrification resistance of the glass decreases. In addition, problems such as an increase in the glass transition temperature Tg and a decrease in thermal stability are likely to occur. From the viewpoint of avoiding such a problem, the upper limit of the content of Al 2 O 3 is preferably the above range.

在第2實施方式的光學玻璃中，SiO2 的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。SiO2 的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of SiO 2 is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The content of SiO 2 may also be 0%.

需要說明的是，有時在玻璃的熔融中使用石英玻璃製坩堝等石英玻璃製的熔融器具。該情況下，由於少量的SiO2 從熔融器具熔入玻璃熔融物，因此，即使玻璃原料不含SiO2 ，製成的玻璃中也會含有少量的SiO2 。從石英玻璃製的熔融器具混入玻璃的SiO2 的量也取決於熔融條件，例如相對於全部玻璃成分的含量的合計為0.5~1質量%左右。在除SiO2 以外的玻璃成分的含有比為恆定的狀態下，SiO2 的量增加0.5~1質量%左右。需要說明的是，根據熔解條件，上述量會有增減。根據SiO2 的含量不同，折射率、阿貝數等光學特性發生變化，因此，可對除SiO2 以外的玻璃成分的含量進行微調而得到具有期望的光學特性的光學玻璃。It should be noted that a melting utensil made of quartz glass such as a crucible made of quartz glass may be used for melting of glass. In this case, since a small amount of SiO 2 is melted into the glass melt from the melting tool, even if the glass raw material does not contain SiO 2 , a small amount of SiO 2 is contained in the finished glass. The amount of SiO 2 mixed into the glass from the melting tool made of quartz glass also depends on the melting conditions. For example, the total content of all glass components is about 0.5 to 1% by mass. In a state where the content ratio of glass components other than SiO 2 is constant, the amount of SiO 2 increases by about 0.5 to 1% by mass. It should be noted that the above amount may increase or decrease depending on the melting conditions. Depending on the content of SiO 2 , optical properties such as refractive index and Abbe number change. Therefore, the content of glass components other than SiO 2 can be finely adjusted to obtain optical glass having desired optical properties.

SiO2 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性、化學耐久性、耐候性、提高熔融玻璃的黏度、容易將熔融玻璃成型的作用。另一方面，SiO2 的含量多時，存在玻璃的耐失透性降低的傾向。因此，SiO2 的含量的上限較佳為上述範圍。SiO 2 is a network forming component of glass, and has the functions of improving the thermal stability, chemical durability, and weather resistance of glass, increasing the viscosity of molten glass, and facilitating molding of molten glass. On the other hand, when the content of SiO 2 is large, the devitrification resistance of the glass tends to decrease. Therefore, the upper limit of the content of SiO 2 is preferably the above range.

在第2實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量[P2 O5 ＋B2 O3 ＋SiO2 ]的上限較佳為45%，進一步以42%、40%、38%的順序更佳。該合計含量的下限較佳為25%，進一步以28%、30%、32%的順序更佳。In the optical glass of the second embodiment, the upper limit of the total content of P 2 O 5 , B 2 O 3 and SiO 2 [P 2 O 5 +B 2 O 3 +SiO 2 ] is preferably 45%, and further 42%, The order of 40% and 38% is better. The lower limit of the total content is preferably 25%, and more preferably in the order of 28%, 30%, and 32%.

藉由將合計含量[P2 O5 ＋B2 O3 ＋SiO2 ]設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。By setting the total content [P 2 O 5 +B 2 O 3 +SiO 2 ] in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在第2實施方式的光學玻璃中，Bi2 O3 的含量的上限較佳為15%，進一步以10%、7%、5%、3%的順序更佳。另外，Bi2 O3 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of Bi 2 O 3 is preferably 15%, and more preferably in the order of 10%, 7%, 5%, and 3%. In addition, the lower limit of the content of Bi 2 O 3 is preferably 0%.

藉由適量含有Bi2 O3 ，具有改善玻璃的熱穩定性的作用。另一方面，提高Bi2 O3 的含量時，玻璃的著色增大。因此，Bi2 O3 的含量較佳為上述範圍。By containing Bi 2 O 3 in an appropriate amount, it has the effect of improving the thermal stability of the glass. On the other hand, when the content of Bi 2 O 3 is increased, the coloration of the glass increases. Therefore, the content of Bi 2 O 3 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Ta2 O5 的含量的上限較佳為10%，進一步以7%、5%、3%的順序更佳。另外，Ta2 O5 的含量的下限較佳為0%。Ta2 O5 的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of Ta 2 O 5 is preferably 10%, and more preferably in the order of 7%, 5%, and 3%. In addition, the lower limit of the content of Ta 2 O 5 is preferably 0%. The content of Ta 2 O 5 may also be 0%.

Ta2 O5 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。另一方面，Ta2 O5 使折射率上升，使玻璃高分散化。另外，Ta2 O5 的含量變多時，玻璃的熱穩定性降低，將玻璃熔融時，容易產生玻璃原料的熔融殘留物。因此，Ta2 O5 的含量較佳為上述範圍。此外，Ta2 O5 與其它玻璃成分相比，是非常昂貴的成分，Ta2 O5 的含量變多時，玻璃的生產成本增大。此外，Ta2 O5 與其它玻璃成分相比分子量大，因此會增大玻璃的比重，其結果，增大光學元件的重量。Ta 2 O 5 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. On the other hand, Ta 2 O 5 increases the refractive index and makes the glass highly dispersed. In addition, when the content of Ta 2 O 5 increases, the thermal stability of the glass decreases, and when the glass is melted, a molten residue of the glass raw material is likely to be generated. Therefore, the content of Ta 2 O 5 is preferably within the above-mentioned range. In addition, Ta 2 O 5 is a very expensive component compared to other glass components, and when the content of Ta 2 O 5 increases, the production cost of the glass increases. In addition, Ta 2 O 5 has a higher molecular weight than other glass components, and therefore increases the specific gravity of the glass, and as a result, increases the weight of the optical element.

在第2實施方式的光學玻璃中，Li2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。Li2 O的含量的下限較佳為0%。Li2 O的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of Li 2 O is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The lower limit of the content of Li 2 O is preferably 0%. The content of Li 2 O may also be 0%.

Li2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Li2 O的含量變多時，耐失透性降低。因此，Li2 O的含量較佳為上述範圍。Li 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Li 2 O increases, the devitrification resistance decreases. Therefore, the content of Li 2 O is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Na2 O的含量的下限較佳為6%，進一步以10%、12%、13%的順序更佳。另外，Na2 O的含量的上限較佳為30%，進一步以22%、20%、19%、18%的順序更佳。In the optical glass of the second embodiment, the lower limit of the Na 2 O content is preferably 6%, and more preferably in the order of 10%, 12%, and 13%. In addition, the upper limit of the content of Na 2 O is preferably 30%, and more preferably in the order of 22%, 20%, 19%, and 18%.

Na2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Na2 O的含量變多時，耐失透性降低。因此，Na2 O的含量較佳為上述範圍。Na 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Na 2 O increases, the devitrification resistance decreases. Therefore, the content of Na 2 O is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，K2 O的含量的下限較佳為1%，進一步以2%、3%、4%的順序更佳。另外，K2 O的含量的上限較佳為13%，進一步以12%、11%、10%的順序更佳。In the optical glass of the second embodiment, the lower limit of the K 2 O content is preferably 1%, and more preferably in the order of 2%, 3%, and 4%. In addition, the upper limit of the K 2 O content is preferably 13%, and more preferably in the order of 12%, 11%, and 10%.

K2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熱穩定性的作用，而且具有增大平均線性熱膨脹係數的作用。另一方面，K2 O的含量變多時，熱穩定性降低，玻璃化時變多容易產生條紋。因此，K2 O的含量較佳為上述範圍。K 2 O is a component that contributes to the low specific gravity of the glass, has the effect of improving the thermal stability of the glass, and has the effect of increasing the average linear thermal expansion coefficient. On the other hand, when the content of K 2 O increases, the thermal stability decreases, and the increase in vitrification tends to produce streaks. Therefore, the content of K 2 O is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]的上限較佳為35%，進一步以30%、28%、26%、25%的順序更佳。另外，該合計含量的下限較佳為10%，進一步以14%、18%、19%、20%的順序更佳。In the optical glass of the second embodiment, the upper limit of the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O + Na 2 O + K 2 O] is preferably 35%, and more preferably 30%, 28%, and 26%. The order of% and 25% is better. In addition, the lower limit of the total content is preferably 10%, and more preferably in the order of 14%, 18%, 19%, and 20%.

Li2 O、Na2 O及K2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]較佳為上述範圍。Li 2 O, Na 2 O, and K 2 O all have the effect of improving the thermal stability of glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O+Na 2 O+K 2 O] is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Cs2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。另外，Cs2 O的含量的下限較佳為0%。Cs2 O的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the Cs 2 O content is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. In addition, the lower limit of the content of Cs 2 O is preferably 0%. The content of Cs 2 O may also be 0%.

Cs2 O具有改善玻璃的熔融性的作用，但其含量變多時，玻璃的熱穩定性、折射率nd降低，而且在熔解中，玻璃成分的揮發增加，變得不能得到期望的玻璃。因此，Cs2 O的含量較佳為上述範圍。Cs 2 O has an effect of improving the meltability of the glass, but when its content increases, the thermal stability and refractive index nd of the glass decrease, and during melting, the volatilization of glass components increases, making it impossible to obtain the desired glass. Therefore, the content of Cs 2 O is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]的上限較佳為35%，進一步以30%、28%、26%、25%的順序更佳。另外，該合計含量的下限較佳為10%，進一步以14%、18%、19%、20%的順序更佳。In the optical glass of the second embodiment, the upper limit of the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [Li 2 O + Na 2 O + K 2 O + Cs 2 O] is preferably 35%, and more preferably 30%. The order of %, 28%, 26%, 25% is better. In addition, the lower limit of the total content is preferably 10%, and more preferably in the order of 14%, 18%, 19%, and 20%.

Li2 O、Na2 O、K2 O及Cs2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]較佳為上述範圍。Li 2 O, Na 2 O, K 2 O, and Cs 2 O all have the effect of improving the thermal stability of the glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [Li 2 O+Na 2 O+K 2 O+Cs 2 O] is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，MgO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，MgO的含量的下限較佳為0%。MgO的含量也可以為0%。In the optical glass of the second embodiment, the content of MgO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of MgO is preferably 0%. The content of MgO may also be 0%.

在第2實施方式的光學玻璃中，CaO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，CaO的含量的下限較佳為0%。CaO的含量也可以為0%。In the optical glass of the second embodiment, the content of CaO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of CaO is preferably 0%. The content of CaO may also be 0%.

在第2實施方式的光學玻璃中，SrO的含量較佳為6%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，SrO的含量的下限較佳為0%。In the optical glass of the second embodiment, the content of SrO is preferably 6% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of SrO is preferably 0%.

在第2實施方式的光學玻璃中，BaO的含量較佳為8%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，BaO的含量的下限較佳為0%。In the optical glass of the second embodiment, the content of BaO is preferably 8% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of BaO is preferably 0%.

MgO、CaO、SrO、BaO均為具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，這些玻璃成分的含量變多時，損害高分散性，另外，玻璃的熱穩定性及耐失透性降低。因此，這些玻璃成分的各含量分別較佳為上述範圍。MgO, CaO, SrO, and BaO are all glass components that improve the thermal stability and devitrification resistance of glass. However, when the content of these glass components increases, high dispersibility is impaired, and the thermal stability and devitrification resistance of the glass are reduced. Therefore, each content of these glass components is each preferably in the above-mentioned range.

在第2實施方式的光學玻璃中，ZnO的含量的上限較佳為10%，進一步以6%、4%、3%的順序更佳。較佳ZnO含量少的情況，其下限較佳為0%。ZnO的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of ZnO is preferably 10%, and more preferably in the order of 6%, 4%, and 3%. Preferably, when the content of ZnO is small, the lower limit is preferably 0%. The content of ZnO can also be 0%.

ZnO是具有改善玻璃的熱穩定性的作用的玻璃成分。然而，ZnO的含量過多時，玻璃的比重增大。而且，相對折射率溫度係數(dn/dT)變高。因此，ZnO的含量較佳為上述範圍。ZnO is a glass component that has the effect of improving the thermal stability of glass. However, when the content of ZnO is too large, the specific gravity of the glass increases. Furthermore, the relative refractive index temperature coefficient (dn/dT) becomes higher. Therefore, the content of ZnO is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，ZrO2 的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，ZrO2 的含量的下限較佳為0%。In the optical glass of the second embodiment, the content of ZrO 2 is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of ZrO 2 is preferably 0%.

ZrO2 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，ZrO2 的含量過多時，顯示出熱穩定性降低的傾向。因此，ZrO2 的含量較佳為上述範圍。ZrO 2 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. However, when the content of ZrO 2 is too large, the thermal stability tends to decrease. Therefore, the content of ZrO 2 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Sc2 O3 的含量的上限較佳為2%。另外，Sc2 O3 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of Sc 2 O 3 is preferably 2%. In addition, the lower limit of the content of Sc 2 O 3 is preferably 0%.

在第2實施方式的光學玻璃中，HfO2 的含量的上限較佳為2%。另外，HfO2 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of HfO 2 is preferably 2%. In addition, the lower limit of the content of HfO 2 is preferably 0%.

Sc2 O3 、HfO2 均具有提高折射率nd的作用，而且是昂貴的成分。因此，Sc2 O3 、HfO2 的各含量較佳為上述範圍。Both Sc 2 O 3 and HfO 2 have the effect of increasing the refractive index nd, and are expensive components. Therefore, the respective contents of Sc 2 O 3 and HfO 2 are preferably within the above-mentioned ranges.

在第2實施方式的光學玻璃中，Lu2 O3 的含量的上限較佳為2%。另外，Lu2 O3 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of Lu 2 O 3 is preferably 2%. In addition, the lower limit of the content of Lu 2 O 3 is preferably 0%.

Lu2 O3 具有提高折射率nd的作用。另外，其分子量大，因此也是增加玻璃的比重的玻璃成分。因此，Lu2 O3 的含量較佳為上述範圍。Lu 2 O 3 has the effect of increasing the refractive index nd. In addition, since its molecular weight is large, it is also a glass component that increases the specific gravity of glass. Therefore, the content of Lu 2 O 3 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，GeO2 的含量的上限較佳為2%。另外，GeO2 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of GeO 2 is preferably 2%. In addition, the lower limit of the content of GeO 2 is preferably 0%.

GeO2 具有提高折射率nd的作用，而且是在通常使用的玻璃成分中特別地昂貴的成分。因此，從降低玻璃的製造成本的觀點考慮，GeO2 的含量較佳為上述範圍。GeO 2 has the effect of increasing the refractive index nd, and is a particularly expensive component among glass components commonly used. Therefore, from the viewpoint of reducing the manufacturing cost of glass, the content of GeO 2 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，La2 O3 的含量的上限較佳為2%。另外，La2 O3 的含量的下限較佳為0%。La2 O3 的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of La 2 O 3 is preferably 2%. In addition, the lower limit of the content of La 2 O 3 is preferably 0%. The content of La 2 O 3 may also be 0%.

La2 O3 的含量變多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，La2 O3 的含量較佳為上述範圍。When the content of La 2 O 3 increases, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. Therefore, the content of La 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and resistance to devitrification.

在第2實施方式的光學玻璃中，Gd2 O3 的含量的上限較佳為2%。另外，Gd2 O3 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of Gd 2 O 3 is preferably 2%. In addition, the lower limit of the content of Gd 2 O 3 is preferably 0%.

Gd2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。另外，Gd2 O3 的含量過多時，玻璃的比重增大而不佳。因此，從良好地保持玻璃的熱穩定性及耐失透性、同時抑制比重的增大的觀點考慮，Gd2 O3 的含量較佳為上述範圍。When the content of Gd 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. In addition, when the content of Gd 2 O 3 is too large, the specific gravity of the glass increases and is unfavorable. Therefore, from the viewpoint of maintaining the thermal stability and devitrification resistance of the glass while suppressing an increase in specific gravity, the content of Gd 2 O 3 is preferably within the above-mentioned range.

在第2實施方式的光學玻璃中，Y2 O3 的含量的上限較佳為2%。另外，Y2 O3 的含量的下限較佳為0%。Y2 O3 的含量也可以為0%。In the optical glass of the second embodiment, the upper limit of the content of Y 2 O 3 is preferably 2%. In addition, the lower limit of the content of Y 2 O 3 is preferably 0%. The content of Y 2 O 3 may also be 0%.

Y2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，Y2 O3 的含量較佳為上述範圍。When the content of Y 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. Therefore, the content of Y 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and devitrification resistance.

在第2實施方式的光學玻璃中，Yb2 O3 的含量的上限較佳為2%。另外，Yb2 O3 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the content of Yb 2 O 3 is preferably 2%. In addition, the lower limit of the content of Yb 2 O 3 is preferably 0%.

Yb2 O3 與La2 O3 、Gd2 O3 、Y2 O3 相比，分子量大，因此會增大玻璃的比重。玻璃的比重增大時，光學元件的質量增大。例如，如果將質量大的透鏡導入自動對焦式的攝像透鏡，則自動對焦時，透鏡的驅動所需的電力增大，電池的消耗變得嚴重。因此，期望減少Yb2 O3 的含量，抑制玻璃的比重的增大。Yb 2 O 3 has a larger molecular weight than La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 , and therefore increases the specific gravity of glass. As the specific gravity of the glass increases, the quality of the optical element increases. For example, if a high-quality lens is introduced into an auto-focusing type imaging lens, the power required for driving the lens increases during auto-focusing, and the battery consumption becomes serious. Therefore, it is desirable to reduce the content of Yb 2 O 3 and suppress an increase in the specific gravity of the glass.

另外，Yb2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。從防止玻璃的熱穩定性的降低、抑制比重的增大的觀點考慮，Yb2 O3 的含量較佳為上述範圍。In addition, when the content of Yb 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. From the viewpoints of preventing a decrease in the thermal stability of the glass and suppressing an increase in specific gravity, the content of Yb 2 O 3 is preferably within the above-mentioned range.

較佳為第2實施方式的光學玻璃主要以上述的玻璃成分、即作為必要成分的P2 O5 、TiO2 、Nb2 O5 、作為任意成分的WO3 、B2 O3 、Al2 O3 、SiO2 、Bi2 O3 、Ta2 O5 、Li2 O、Na2 O、K2 O、Cs2 O、MgO、CaO、SrO、BaO、ZnO、ZrO2 、Sc2 O3 、HfO2 、Lu2 O3 、GeO2 、La2 O3 、Gd2 O3 、Y2 O3 、及Yb2 O3 構成，上述的玻璃成分的合計含量較佳為95%以上、更佳為98%以上、進一步較佳為99%以上、更進一步較佳為99.5%以上。Preferably, the optical glass of the second embodiment mainly contains the above-mentioned glass components, namely P 2 O 5 , TiO 2 , Nb 2 O 5 as essential components, and WO 3 , B 2 O 3 , and Al 2 O as optional components. 3. SiO 2 , Bi 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, K 2 O, Cs 2 O, MgO, CaO, SrO, BaO, ZnO, ZrO 2 , Sc 2 O 3 , HfO 2. Lu 2 O 3 , GeO 2 , La 2 O 3 , Gd 2 O 3 , Y 2 O 3 , and Yb 2 O 3 , the total content of the above glass components is preferably 95% or more, more preferably 98 % Or more, more preferably 99% or more, still more preferably 99.5% or more.

在第2實施方式的光學玻璃中，TeO2 的含量的上限較佳為2%。另外，TeO2 的含量的下限較佳為0%。In the optical glass of the second embodiment, the upper limit of the TeO 2 content is preferably 2%. In addition, the lower limit of the TeO 2 content is preferably 0%.

由於TeO2 具有毒性，因此，較佳為減少TeO2 的含量。因此，TeO2 的含量較佳為上述範圍。Since TeO 2 is toxic, it is preferable to reduce the content of TeO 2. Therefore, the content of TeO 2 is preferably within the above-mentioned range.

需要說明的是，較佳為第2實施方式的光學玻璃基本上由上述玻璃成分構成，但在不妨礙本發明的作用效果的範圍內，也可以含有其它成分。另外，在本發明中，不排除含有不可避免的雜質。It should be noted that it is preferable that the optical glass of the second embodiment is basically composed of the above-mentioned glass components, but it may contain other components within a range that does not hinder the effects of the present invention. In addition, in the present invention, the inclusion of unavoidable impurities is not excluded.

＜其它成分組成＞ Pb、As、Cd、Tl、Be、Se均具有毒性。因此，較佳為第2實施方式的光學玻璃不含這些元素作為玻璃成分。＜Other component composition＞ Pb, As, Cd, Tl, Be, and Se are all toxic. Therefore, it is preferable that the optical glass of the second embodiment does not contain these elements as glass components.

U、Th、Ra均為放射性元素。因此，較佳為第2實施方式的光學玻璃不含這些元素作為玻璃成分。U, Th, and Ra are all radioactive elements. Therefore, it is preferable that the optical glass of the second embodiment does not contain these elements as glass components.

V、Cr、Mn、Fe、Co、Ni、Cu、Pr、Nd、Pm、Sm、Eu、Tb、Dy、Ho、Er、Tm可以增大玻璃的著色、成為螢光的發生源。因此，較佳為第2實施方式的光學玻璃不含這些元素作為玻璃成分。V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm can increase the coloring of glass and become a source of fluorescence. Therefore, it is preferable that the optical glass of the second embodiment does not contain these elements as glass components.

Sb(Sb2 O3 )、Ce(CeO2 )是作為澄清劑發揮功能的可以任意添加的元素。其中，Sb(Sb2 O3 )是澄清效果大的澄清劑。然而，Sb(Sb2 O3 )的氧化性強，如果增加Sb(Sb2 O3 )的添加量，則由於由Sb離子導致的光吸收，玻璃的著色增大而不佳。另外，將玻璃熔融時，如果熔融物中存在Sb，則會促進構成玻璃熔融坩堝的鉑對熔融物的溶出，玻璃中的鉑濃度變高。在玻璃中，鉑以離子的形式存在時，由於光的吸收，玻璃的著色增大。另外，在玻璃中，鉑以固體物質的形式存在時，成為光的散射源，會降低玻璃的品質。Ce(CeO2 )與Sb(Sb2 O3 )相比，澄清效果小。如果大量添加Ce(CeO2 )，則玻璃的著色增強。因此，在添加澄清劑的情況下，較佳為一邊注意添加量一邊添加Sb(Sb2 O3 )。Sb(Sb 2 O 3 ) and Ce(CeO 2 ) are arbitrarily added elements that function as fining agents. Among them, Sb (Sb 2 O 3 ) is a clarifying agent with a large clarifying effect. However, Sb (Sb 2 O 3 ) is highly oxidizing. If the addition amount of Sb (Sb 2 O 3 ) is increased, the coloration of the glass increases due to the light absorption caused by Sb ions. In addition, when the glass is melted, if Sb is present in the melt, the elution of the platinum constituting the glass melting crucible into the melt will be promoted, and the platinum concentration in the glass will increase. In glass, when platinum exists in the form of ions, the color of the glass increases due to the absorption of light. In addition, when platinum exists in the form of a solid substance in glass, it becomes a scattering source of light and degrades the quality of the glass. Ce(CeO 2 ) has a smaller clarifying effect than Sb(Sb 2 O 3 ). If Ce(CeO 2 ) is added in a large amount, the coloring of the glass is enhanced. Therefore, when adding a clarifier, it is preferable to add Sb (Sb 2 O 3 ) while paying attention to the addition amount.

將Sb2 O3 的含量設為外加比例表示。即，將除Sb2 O3 及CeO2 以外的全部玻璃成分的合計含量設為100質量%時，Sb2 O3 的含量較佳小於1質量%、更佳小於0.1質量%。進一步以小於0.05質量%、小於0.03質量%、小於0.02質量%、小於0.01%的順序較佳。Sb2 O3 的含量也可以為0質量%。The content of Sb 2 O 3 is expressed as an additional ratio. That is, when the total content of all glass components other than Sb 2 O 3 and CeO 2 is 100% by mass, the content of Sb 2 O 3 is preferably less than 1% by mass, more preferably less than 0.1% by mass. More preferably, the order is less than 0.05% by mass, less than 0.03% by mass, less than 0.02% by mass, and less than 0.01%. The content of Sb 2 O 3 may be 0% by mass.

將CeO2 的含量也設為外加比例表示。即，將除CeO2 、Sb2 O3 以外的全部玻璃成分的合計含量設為100質量%時，CeO2 的含量較佳小於2質量%、更佳小於1質量%、進一步較佳小於0.5質量%、更進一步較佳小於0.1質量%的範圍。CeO2 的含量也可以為0質量%。藉由將CeO2 的含量設為上述範圍，可以改善玻璃的澄清性。The content of CeO 2 is also expressed as an additional ratio. That is, when the total content of all glass components except CeO 2 and Sb 2 O 3 is 100% by mass, the content of CeO 2 is preferably less than 2% by mass, more preferably less than 1% by mass, and still more preferably less than 0.5% by mass. %. More preferably, the range is less than 0.1% by mass. The content of CeO 2 may also be 0% by mass. By setting the content of CeO 2 in the above range, the clarity of the glass can be improved.

(玻璃特性) 接下來，對第2實施方式的光學玻璃的特性進行說明。(Glass characteristics) Next, the characteristics of the optical glass of the second embodiment will be described.

＜折射率nd＞ 在第2實施方式的光學玻璃中，折射率nd較佳為1.63~1.80。折射率nd的下限可以為1.65、1.67、1.69、1.71或1.73，折射率nd的上限可以為1.79、1.78或1.77。＜Refractive index nd＞ In the optical glass of the second embodiment, the refractive index nd is preferably 1.63 to 1.80. The lower limit of the refractive index nd may be 1.65, 1.67, 1.69, 1.71, or 1.73, and the upper limit of the refractive index nd may be 1.79, 1.78, or 1.77.

可以藉由適宜調整各玻璃成分的含量而使折射率nd為期望的值。具有相對地提高折射率nd的作用的成分(高折射率化成分)為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 、La2 O3 等。另一方面，具有相對地降低折射率nd的作用的成分(低折射率化成分)為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O等。The refractive index nd can be a desired value by appropriately adjusting the content of each glass component. The components having the effect of relatively increasing the refractive index nd (high refractive index components) are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 , La 2 O 3 and the like. On the other hand, the components (low-refractive-index components) having the effect of relatively lowering the refractive index nd are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, and the like.

＜阿貝數νd＞ 在第2實施方式的光學玻璃中，阿貝數νd較佳為20~30。阿貝數νd的下限可以為22、22.5、23或23.2，阿貝數νd的上限可以為28、26或25。＜Abbe number νd＞ In the optical glass of the second embodiment, the Abbe number νd is preferably 20-30. The lower limit of the Abbe number νd can be 22, 22.5, 23, or 23.2, and the upper limit of the Abbe number νd can be 28, 26, or 25.

可以藉由適宜調整各玻璃成分的含量而使阿貝數νd為期望的值。阿貝數νd相對較低的成分、即高分散化成分為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 等。另一方面，阿貝數νd相對較高的成分、即低分散化成分為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O、La2 O3 、BaO、CaO、SrO等。The Abbe number νd can be adjusted to a desired value by appropriately adjusting the content of each glass component. Components with a relatively low Abbe number νd, that is, highly dispersed components, are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 and the like. On the other hand, components with relatively high Abbe number νd, that is, low-dispersion components, are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, La 2 O 3 , BaO, CaO, SrO, etc.

＜平均線性熱膨脹係數α＞ 在第2實施方式的光學玻璃中，100~300℃的平均線性熱膨脹係數α的下限較佳為100×10-7 ℃-1 ，進一步以105×10-7 ℃-1 、110×10-7 ℃-1 、115×10-7 ℃-1 、120×10-7 ℃-1 的順序更佳。另外，平均線性熱膨脹係數α的上限更佳為200×10-7 ℃-1 ，進一步以190×10-7 ℃-1 、180×10-7 ℃-1 、170×10-7 ℃-1 、160×10-7 ℃-1 、150×10-7 ℃-1 、145×10-7 ℃-1 的順序更佳。<Average coefficient of linear thermal expansion α> In the optical glass of the second embodiment, the lower limit of the average coefficient of linear thermal expansion α at 100 to 300°C is preferably 100×10 -7 ℃ -1 , and more preferably 105×10 -7 ℃ - 1. The order of 110×10 -7 ℃ -1 , 115×10 -7 ℃ -1 , 120×10 -7 ℃ -1 is better. In addition, the upper limit of the average linear thermal expansion coefficient α is more preferably 200×10 -7 ℃ -1 , and further is 190×10 -7 ℃ -1 , 180×10 -7 ℃ -1 , 170×10 -7 ℃ -1 , The order of 160×10 -7 ℃ -1 , 150×10 -7 ℃ -1 , and 145×10 -7 ℃ -1 is better.

藉由將100~300℃的平均線性膨脹係數α設為上述範圍，可以抑制玻璃伴隨著熱膨脹的折射率的變化、即抑制相對折射率溫度係數dn/dT的增大。By setting the average linear expansion coefficient α of 100 to 300°C in the above range, it is possible to suppress the change in the refractive index of the glass accompanying thermal expansion, that is, to suppress the increase in the relative refractive index temperature coefficient dn/dT.

平均線性膨脹係數α基於JOGIS08-2003的規定來測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定溫度和試樣的伸長率。 需要說明的是，在本說明書中，將平均線性膨脹係數α用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，平均線性膨脹係數α的數值也相同。The average linear expansion coefficient α is determined based on the regulations of JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. Determine the temperature and the elongation of the sample. It should be noted that in this specification, the average linear expansion coefficient α is expressed in the unit of [°C -1 ], but when [K -1 ] is used as the unit, the numerical value of the average linear expansion coefficient α is also the same.

＜相對折射率溫度係數dn/dT＞ 在第2實施方式的光學玻璃中，He-Ne雷射的波長(633nm)下的相對折射率溫度係數dn/dT在20~40℃的範圍內較佳為-1.0×10-6 ~-13.0×10-6 ℃-1 ，進一步以-1.0×10-6 ~-10.0×10-6 ℃-1 、-1.5×10-6 ~-9.0×10-6 ℃-1 、-2.0×10-6 ~-8.0×10-6 ℃-1 、-2.5×10-6 ~-7.0×10-6 ℃-1 、-3.0×10-6 ~-6.5×10-6 ℃-1 的順序更佳。<Relative refractive index temperature coefficient dn/dT> In the optical glass of the second embodiment, the relative refractive index temperature coefficient dn/dT at the wavelength (633 nm) of the He-Ne laser is preferably in the range of 20 to 40°C It is -1.0×10 -6 ~-13.0×10 -6 ℃ -1 , further by -1.0×10 -6 ~-10.0×10 -6 ℃ -1 , -1.5×10 -6 ~-9.0×10 -6 ℃ -1, -2.0 × 10 -6 ~ -8.0 × 10 -6 ℃ -1, -2.5 × 10 -6 ~ -7.0 × 10 -6 ℃ -1, -3.0 × 10 -6 ~ -6.5 × 10 - The order of 6 ℃ -1 is better.

藉由將dn/dT設為上述範圍，並與dn/dT為正的光學元件組合，即使在光學元件的溫度大幅變動這樣的環境中，折射率的變動也小，因此，可以在更寬的溫度範圍中以高精度發揮期望的光學特性。By setting dn/dT in the above range and combining it with an optical element whose dn/dT is positive, even in an environment where the temperature of the optical element fluctuates greatly, the change in refractive index is small. Demonstrates the desired optical characteristics with high accuracy in the temperature range.

相對折射率溫度係數dn/dT基於JOGIS18-2008的干涉法來測定。 需要說明的是，在本說明書中，將溫度係數dn/dT用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，溫度係數dn/dT的數值也相同。The relative refractive index temperature coefficient dn/dT is measured based on the interferometry of JOGIS18-2008. It should be noted that in this specification, the temperature coefficient dn/dT is expressed in the unit of [°C -1 ], but when [K -1 ] is used as the unit, the value of the temperature coefficient dn/dT is also the same.

＜玻璃化轉變溫度Tg＞ 第2實施方式的光學玻璃的玻璃化轉變溫度Tg較佳為600℃以下，進一步以590℃以下、580℃以下、570℃以下、560℃以下的順序更佳。＜Glass transition temperature Tg＞ The glass transition temperature Tg of the optical glass of the second embodiment is preferably 600°C or lower, and more preferably in the order of 590°C or lower, 580°C or lower, 570°C or lower, and 560°C or lower.

藉由使玻璃化轉變溫度Tg的上限滿足上述範圍，可以抑制玻璃的成型溫度及退火溫度的上升，可以降低熱對壓製成型用設備及退火設備的損傷。另外，藉由使玻璃化轉變溫度Tg的下限滿足上述範圍，容易在保持期望的阿貝數、折射率的同時良好地保持玻璃的熱穩定性。When the upper limit of the glass transition temperature Tg satisfies the above range, it is possible to suppress the increase in the molding temperature and annealing temperature of the glass, and it is possible to reduce the damage to the press molding equipment and the annealing equipment due to heat. In addition, by making the lower limit of the glass transition temperature Tg satisfy the above-mentioned range, it is easy to maintain the thermal stability of the glass while maintaining the desired Abbe number and refractive index.

＜玻璃的比重＞ 在第2實施方式的光學玻璃中，比重較佳為3.40以下，進一步以3.30以下、3.20以下的順序更佳。如果能夠減少玻璃的比重，則可以減少透鏡的重量。其結果，可以降低搭載透鏡的相機透鏡的自動對焦驅動的消耗電力。＜Specific gravity of glass＞ In the optical glass of the second embodiment, the specific gravity is preferably 3.40 or less, and more preferably 3.30 or less and 3.20 or less in this order. If the specific gravity of the glass can be reduced, the weight of the lens can be reduced. As a result, it is possible to reduce the power consumption of the autofocus drive of the lens-mounted camera lens.

＜玻璃的透光性＞ 第2實施方式的光學玻璃的透光性可以藉由著色度λ5來評價。 對於厚度10.0mm±0.1mm的玻璃試樣，在波長200~700nm的範圍內測定分光透射率，將外部透射率成為5%的波長設為λ5。＜Transmittance of glass＞ The light transmittance of the optical glass of the second embodiment can be evaluated by the coloring degree λ5. For a glass sample with a thickness of 10.0 mm±0.1 mm, the spectral transmittance is measured in a wavelength range of 200 to 700 nm, and the wavelength at which the external transmittance becomes 5% is set to λ5.

第2實施方式的光學玻璃的λ5較佳為400nm以下，更佳為390nm以下、進一步較佳為385nm以下。The λ5 of the optical glass of the second embodiment is preferably 400 nm or less, more preferably 390 nm or less, and still more preferably 385 nm or less.

藉由使用將λ5短波長化後的光學玻璃，可以提供可實現適宜的顏色再現的光學元件。By using optical glass whose wavelength has been shortened to λ5, it is possible to provide optical elements that can achieve appropriate color reproduction.

對於第2實施方式的光學玻璃的製造及光學元件等製造，可以設為與第1實施方式相同。The manufacturing of the optical glass and the manufacturing of optical elements and the like of the second embodiment can be the same as those of the first embodiment.

第3實施方式 對第3實施方式的光學玻璃詳細地進行說明。 第3實施方式的光學玻璃的P2 O5 的含量為25~50%， Nb2 O5 含量為14~40%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]為10%以上， Na2 O的含量相對於K2 O的含量的質量比[Na2 O/K2 O]為1.50以上。In the third embodiment, the optical glass of the third embodiment will be described in detail. In the optical glass of the third embodiment , the content of P 2 O 5 is 25-50%, the content of Nb 2 O 5 is 14-40%, TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3, and Ta 2 O The total content of 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60%, and the content of TiO 2 is relative to TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and The mass ratio of the total content of Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 or more, and the content of B 2 O 3 is relative to that of P 2 O 5 The mass ratio of content [B 2 O 3 /P 2 O 5 ] is 0.05~0.39, and the total content of Li 2 O, Na 2 O, K 2 O and Cs 2 O [Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O] is more than 10%, Na 2 O with respect to the content of K 2 O content mass ratio of [Na 2 O / K 2 O ] of 1.50 or more.

在第3實施方式的光學玻璃中，P2 O5 的含量為25~50%。P2 O5 的含量的下限較佳為26%，進一步以26.5%、26.7%的順序更佳。另外，P2 O5 的含量的上限較佳為42%，進一步以40%、38%、37%、36%的順序更佳。In the optical glass of the third embodiment, the content of P 2 O 5 is 25 to 50%. The lower limit of the content of P 2 O 5 is preferably 26%, and more preferably in the order of 26.5% and 26.7%. In addition, the upper limit of the content of P 2 O 5 is preferably 42%, and more preferably in the order of 40%, 38%, 37%, and 36%.

P2 O5 是玻璃的網絡形成成分，是為了在玻璃中大量含有高分散成分的必要成分。藉由將P2 O5 的含量設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。P 2 O 5 is a network-forming component of glass, and is an essential component in order to contain a large amount of highly dispersed components in the glass. By setting the content of P 2 O 5 in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在第3實施方式的光學玻璃中，Nb2 O5 的含量為14~40%。Nb2 O5 的含量的下限較佳為16%，進一步以17%、18%、19%、20%的順序更佳。另外，Nb2 O5 的含量的上限較佳為38%，進一步以36%、34%、32%的順序更佳。In the optical glass of the third embodiment, the content of Nb 2 O 5 is 14 to 40%. The lower limit of the Nb 2 O 5 content is preferably 16%, and more preferably in the order of 17%, 18%, 19%, and 20%. In addition, the upper limit of the Nb 2 O 5 content is preferably 38%, and more preferably 36%, 34%, and 32% in this order.

Nb2 O5 是有助於高折射率化及高分散化的成分。因此，藉由將Nb2 O5 的含量設為上述範圍，可得到具有期望的光學常數的光學玻璃。另一方面，Nb2 O5 的含量過多時，存在玻璃的著色增強的擔憂。Nb 2 O 5 is a component that contributes to high refractive index and high dispersion. Therefore, by setting the content of Nb 2 O 5 in the above-mentioned range, an optical glass having a desired optical constant can be obtained. On the other hand, when the content of Nb 2 O 5 is too large, the coloring of the glass may increase.

在第3實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60%。該合計含量的下限較佳為36%，進一步以37%、38%、39%的順序更佳。另外，該合計含量的上限較佳為55%，進一步以50%、48%、47%、46%的順序更佳。In the optical glass of the third embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] Is 35~60%. The lower limit of the total content is preferably 36%, and more preferably in the order of 37%, 38%, and 39%. In addition, the upper limit of the total content is preferably 55%, and more preferably in the order of 50%, 48%, 47%, and 46%.

TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 是有助於玻璃的高分散化的成分。因此，藉由將合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]設為上述範圍，可得到具有期望的光學常數的光學玻璃，而且，還可以改善玻璃的熱穩定性。另一方面，該合計含量過多時，存在不能得到具有期望的光學常數的光學玻璃的擔憂，而且，存在玻璃的熱穩定性降低、玻璃的著色變強的擔憂。TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 are components that contribute to the high dispersion of glass. Therefore, by setting the total content [TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 ] in the above range, an optical glass with desired optical constants can be obtained, and the thermal stability of the glass can be improved. Sex. On the other hand, when the total content is too large, there is a concern that an optical glass having a desired optical constant cannot be obtained, and the thermal stability of the glass is lowered, and the coloring of the glass becomes strong.

在第3實施方式的光學玻璃中，TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。該質量比的下限較佳為0.26，進一步以0.27、0.28、0.29、0.30的順序更佳。另外，該質量比的上限較佳為0.65，進一步以0.60、0.58、0.56、0.54、0.52、0.50、0.48的順序更佳。In the optical glass of the third embodiment, TiO 2 content with respect to TiO 2, Nb 2 O 5, 3 mass 2 O 3 and the total content of Ta 2 O 5 is Bi WO, than [TiO 2 / (TiO 2 + Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is 0.25 or more. The lower limit of the mass ratio is preferably 0.26, and more preferably in the order of 0.27, 0.28, 0.29, and 0.30. In addition, the upper limit of the mass ratio is preferably 0.65, and more preferably in the order of 0.60, 0.58, 0.56, 0.54, 0.52, 0.50, 0.48.

TiO2 是高折射率化成分中、高分散化的作用特別大的成分。因此，從得到期望的光學常數的觀點考慮，質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]較佳為上述範圍。TiO 2 is a component that has a particularly large effect on high dispersion among components that increase refractive index. Therefore, from the viewpoint of obtaining desired optical constants, the mass ratio [TiO 2 /(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )] is preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39。該質量比的上限較佳為0.30，進一步以0.25、0.22、0.20、0.19、0.18的順序更佳。另外，該質量比的下限較佳為0.06，進一步以0.07、0.08、0.09的順序更佳。In the optical glass of the third embodiment, the content of B 2 O 3 relative to the mass content of P 2 O 5 ratio [B 2 O 3 / P 2 O 5] of 0.05 to 0.39. The upper limit of the mass ratio is preferably 0.30, and more preferably in the order of 0.25, 0.22, 0.20, 0.19, and 0.18. In addition, the lower limit of the mass ratio is preferably 0.06, and more preferably in the order of 0.07, 0.08, and 0.09.

藉由將質量比[B2 O3 /P2 O5 ]設為上述範圍，容易得到具有期望的光學常數、熱穩定性高、且耐失透性高的光學玻璃。By setting the mass ratio [B 2 O 3 /P 2 O 5 ] to the above range, it is easy to obtain an optical glass having a desired optical constant, high thermal stability, and high devitrification resistance.

在第3實施方式的光學玻璃中，Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]為10%以上。該合計含量的下限較佳為12%，進一步以14%、16%、17%的順序更佳。另外，該合計含量的上限較佳為35%，進一步以30%、28%、26%、25%的順序更佳。In the optical glass of the third embodiment, the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [Li 2 O+Na 2 O+K 2 O+Cs 2 O] is 10% or more. The lower limit of the total content is preferably 12%, and more preferably in the order of 14%, 16%, and 17%. In addition, the upper limit of the total content is preferably 35%, and more preferably in the order of 30%, 28%, 26%, and 25%.

Li2 O、Na2 O、K2 O及Cs2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]較佳為上述範圍。Li 2 O, Na 2 O, K 2 O, and Cs 2 O all have the effect of improving the thermal stability of the glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [Li 2 O+Na 2 O+K 2 O+Cs 2 O] is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Na2 O的含量相對於K2 O的含量的質量比[Na2 O/K2 O]為1.50以上。該質量比的下限較佳為1.70，進一步以1.90、2.10、2.30的順序更佳。另外，該質量比的上限較佳為10.0，進一步以8.50、7.50、7.00、6.50的順序更佳。In the optical glass of the embodiment 3, Na 2 O with respect to the content of K 2 O content mass ratio of [Na 2 O / K 2 O ] of 1.50 or more. The lower limit of the mass ratio is preferably 1.70, and more preferably in the order of 1.90, 2.10, and 2.30. In addition, the upper limit of the mass ratio is preferably 10.0, and more preferably in the order of 8.50, 7.50, 7.00, and 6.50.

Na2 O及K2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。然而，K2 O的含量變多時，熱穩定性、耐失透性、化學耐久性、耐候性降低。因此，質量比[Na2 O/K2 O]較佳為上述範圍。Na 2 O and K 2 O are components that contribute to the lowering of the specific gravity of the glass, and have the effects of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. However, when the content of K 2 O increases, thermal stability, devitrification resistance, chemical durability, and weather resistance decrease. Therefore, the mass ratio [Na 2 O/K 2 O] is preferably in the above-mentioned range.

對於第3實施方式的光學玻璃中的除上述以外的玻璃成分的含量及比率，以下示出非限定性的實例。Regarding the content and ratio of glass components other than the above in the optical glass of the third embodiment, non-limiting examples are shown below.

在第3實施方式的光學玻璃中，B2 O3 的含量的上限較佳為10%，進一步以9%、8%、7%、6%的順序更佳。In the optical glass of the third embodiment, the upper limit of the content of B 2 O 3 is preferably 10%, and more preferably in the order of 9%, 8%, 7%, and 6%.

B2 O3 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性的作用。另一方面，B2 O3 的含量多時，存在耐失透性降低的傾向。因此，B2 O3 的含量較佳為上述範圍。B 2 O 3 is a network forming component of glass and has the effect of improving the thermal stability of glass. On the other hand, when the content of B 2 O 3 is large, the devitrification resistance tends to decrease. Therefore, the content of B 2 O 3 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，B2 O3 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[B2 O3 /(P2 O5 ＋B2 O3 )]的上限較佳為0.18，進一步以0.17、0.16、0.15的順序更佳。該質量比的下限較佳為0，進一步以0.01、0.03、0.05的順序更佳。In the optical glass of the third embodiment, the content of B 2 O 3 with respect to the total content P 2 O 5 and B 2 O 3 mass ratio [B 2 O 3 / (P 2 O 5 + B 2 O 3)] The upper limit of is preferably 0.18, and more preferably in the order of 0.17, 0.16, 0.15. The lower limit of the mass ratio is preferably 0, and more preferably in the order of 0.01, 0.03, and 0.05.

從改善玻璃的熱穩定性及耐失透性的觀點考慮，質量比[B2 O3 /(P2 O5 ＋B2 O3 )]較佳為上述範圍。From the viewpoint of improving the thermal stability and devitrification resistance of the glass, the mass ratio [B 2 O 3 /(P 2 O 5 +B 2 O 3 )] is preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，Al2 O3 的含量較佳為3%以下，進一步以2%以下、1%以下的順序更佳。Al2 O3 的含量也可以為0%。In the optical glass of the third embodiment, the content of Al 2 O 3 is preferably 3% or less, and more preferably in the order of 2% or less and 1% or less. The content of Al 2 O 3 may also be 0%.

Al2 O3 是具有改善玻璃的化學耐久性、耐候性的作用的玻璃成分，可以將其視為網絡形成成分。另一方面，Al2 O3 的含量變多時，玻璃的耐失透性降低。另外，容易發生玻璃化轉變溫度Tg上升、熱穩定性降低等問題。從避免這樣的問題的觀點考慮，Al2 O3 的含量的上限較佳為上述範圍。Al 2 O 3 is a glass component that has the effect of improving the chemical durability and weather resistance of glass, and it can be regarded as a network forming component. On the other hand, when the content of Al 2 O 3 increases, the devitrification resistance of the glass decreases. In addition, problems such as an increase in the glass transition temperature Tg and a decrease in thermal stability are likely to occur. From the viewpoint of avoiding such a problem, the upper limit of the content of Al 2 O 3 is preferably the above range.

在第3實施方式的光學玻璃中，SiO2 的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。SiO2 的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of SiO 2 is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The content of SiO 2 may also be 0%.

需要說明的是，有時在玻璃的熔融中使用石英玻璃製坩堝等石英玻璃製的熔融器具。在該情況下，由於少量的SiO2 從熔融器具熔入玻璃熔融物，因此，即使玻璃原料不含SiO2 ，製成的玻璃也會含有少量的SiO2 。從石英玻璃製的熔融器具混入玻璃的SiO2 的量也取決於熔融條件，例如相對於全部玻璃成分的含量的合計為0.5~1質量%左右。在除SiO2 以外的玻璃成分的含有比為恆定的狀態下，SiO2 的量增加0.5~1質量%左右。需要說明的是，根據熔解條件，上述量會有增減。根據SiO2 的含量不同，折射率、阿貝數等光學特性會發生變化，因此，可對除SiO2 以外的玻璃成分的含量進行微調而得到具有期望的光學特性的光學玻璃。It should be noted that a melting utensil made of quartz glass such as a crucible made of quartz glass may be used for melting of glass. In this case, since a small amount of SiO 2 is melted into the glass melt from the melting tool, even if the glass raw material does not contain SiO 2 , the finished glass will contain a small amount of SiO 2 . The amount of SiO 2 mixed into the glass from the melting tool made of quartz glass also depends on the melting conditions. For example, the total content of all glass components is about 0.5 to 1% by mass. In a state where the content ratio of glass components other than SiO 2 is constant, the amount of SiO 2 increases by about 0.5 to 1% by mass. It should be noted that the above amount may increase or decrease depending on the melting conditions. Depending on the content of SiO 2 , optical properties such as refractive index and Abbe number change. Therefore, the content of glass components other than SiO 2 can be finely adjusted to obtain optical glass having desired optical properties.

SiO2 是玻璃的網絡形成成分，具有改善玻璃的熱穩定性、化學耐久性、耐候性、提高熔融玻璃的黏度、容易將熔融玻璃成型的作用。另一方面，SiO2 的含量多時，存在玻璃的耐失透性降低的傾向。因此，SiO2 的含量的上限較佳為上述範圍。SiO 2 is a network forming component of glass, and has the functions of improving the thermal stability, chemical durability, and weather resistance of glass, increasing the viscosity of molten glass, and facilitating molding of molten glass. On the other hand, when the content of SiO 2 is large, the devitrification resistance of the glass tends to decrease. Therefore, the upper limit of the content of SiO 2 is preferably the above range.

在第3實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量[P2 O5 ＋B2 O3 ＋SiO2 ]的上限較佳為50%，進一步以45%、43%、42%、41%的順序更佳。該合計含量的下限較佳為25%，進一步以27%、28%、29%的順序更佳。In the optical glass of the third embodiment, the upper limit of the total content [P 2 O 5 + B 2 O 3 + SiO 2 ] of P 2 O 5 , B 2 O 3 and SiO 2 is preferably 50%, and further 45%, The order of 43%, 42%, 41% is better. The lower limit of the total content is preferably 25%, and more preferably in the order of 27%, 28%, and 29%.

藉由將合計含量[P2 O5 ＋B2 O3 ＋SiO2 ]設為上述範圍，可得到熱穩定性高、且具有期望的光學常數的光學玻璃。By setting the total content [P 2 O 5 +B 2 O 3 +SiO 2 ] in the above range, an optical glass having high thermal stability and desired optical constants can be obtained.

在第3實施方式的光學玻璃中，P2 O5 及B2 O3 的合計含量相對於P2 O5 、B2 O3 、SiO2 、及Al2 O3 的合計含量的質量比[(P2 O5 ＋B2 O3 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 )]的下限較佳為0.80，進一步以0.90、0.93、0.96、0.98的順序更佳。該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, the mass ratio of the total content of P 2 O 5 and B 2 O 3 to the total content of P 2 O 5 , B 2 O 3 , SiO 2 , and Al 2 O 3 [( The lower limit of P 2 O 5 +B 2 O 3 )/(P 2 O 5 +B 2 O 3 +SiO 2 +Al 2 O 3 )] is preferably 0.80, and more preferably in the order of 0.90, 0.93, 0.96, and 0.98. The upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到熱穩定性高、具有期望的光學常數的玻璃的觀點考慮，質量比[(P2 O5 ＋B2 O3 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 )]較佳為上述範圍。From the viewpoint of obtaining glass with high thermal stability and desired optical constants, the mass ratio [(P 2 O 5 ＋B 2 O 3 )/(P 2 O 5 ＋B 2 O 3 ＋SiO 2 ＋Al 2 O 3 )] is relatively high. It is preferably the above range.

在第3實施方式的光學玻璃中，TiO2 的含量的下限較佳為10%，進一步以11%、12%、13%的順序更佳。另外，TiO2 的含量的上限較佳為50%，進一步以40%、35%、30%、28%、26%、23%、21%的順序更佳。In the optical glass of the third embodiment, the lower limit of the content of TiO 2 is preferably 10%, and more preferably in the order of 11%, 12%, and 13%. In addition, the upper limit of the content of TiO 2 is preferably 50%, and more preferably in the order of 40%, 35%, 30%, 28%, 26%, 23%, and 21%.

TiO2 顯著有助於高分散化。另一方面，TiO2 比較容易增大玻璃的著色，而且存在容易使熔融性惡化的擔憂。因此，TiO2 的含量較佳為上述範圍。TiO 2 significantly contributes to high dispersion. On the other hand, TiO 2 is relatively easy to increase the coloration of the glass, and there is a concern that it is likely to deteriorate the meltability. Therefore, the content of TiO 2 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，WO3 的含量的上限較佳為15%，進一步以10%、5%、3%、2%、1%的順序更佳。較佳WO3 的含量少的情況，其下限較佳為0%。WO3 的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the WO 3 content is preferably 15%, and more preferably in the order of 10%, 5%, 3%, 2%, and 1%. Preferably , when the content of WO 3 is small, the lower limit is preferably 0%. The content of WO 3 may also be 0%.

藉由將WO3 的含量設為上述範圍，可以提高透射率，而且可以抑制玻璃的比重的增大。另外，可以降低相對折射率溫度係數(dn/dT)。By setting the content of WO 3 in the above-mentioned range, the transmittance can be improved, and an increase in the specific gravity of the glass can be suppressed. In addition, the relative refractive index temperature coefficient (dn/dT) can be reduced.

在第3實施方式的光學玻璃中，Bi2 O3 的含量的上限較佳為15%，進一步以10%、7%、5%、3%的順序更佳。另外，Bi2 O3 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of Bi 2 O 3 is preferably 15%, and more preferably in the order of 10%, 7%, 5%, and 3%. In addition, the lower limit of the content of Bi 2 O 3 is preferably 0%.

藉由適量含有Bi2 O3 ，具有改善玻璃的熱穩定性的作用。另一方面，如果提高Bi2 O3 的含量，則玻璃的著色增大。因此，Bi2 O3 的含量較佳為上述範圍。By containing Bi 2 O 3 in an appropriate amount, it has the effect of improving the thermal stability of the glass. On the other hand, if the content of Bi 2 O 3 is increased, the coloration of the glass increases. Therefore, the content of Bi 2 O 3 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]的上限較佳為0.70，進一步以0.66、0.64、0.62、0.60的順序更佳。該質量比的下限較佳為0.25，進一步以0.27、0.29、0.31的順序更佳。In the optical glass of the third embodiment, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 in mass preferred ratio of the upper limit of [TiO 2 / (P 2 O 5 + B 2 O 3)] of the It is 0.70, more preferably in the order of 0.66, 0.64, 0.62, 0.60. The lower limit of the mass ratio is preferably 0.25, and more preferably in the order of 0.27, 0.29, and 0.31.

藉由將質量比[TiO2 /(P2 O5 ＋B2 O3 )]設為上述範圍，容易得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /(P 2 O 5 +B 2 O 3 )] to the above range, it is easy to obtain an optical glass having a desired optical constant and high thermal stability.

在第3實施方式的光學玻璃中，TiO2 的含量相對於P2 O5 的含量的質量比[TiO2 /P2 O5 ]的上限較佳為0.70，進一步以0.66、0.64、0.62的順序更佳。該質量比的下限較佳為0.25，進一步以0.28、0.31、0.34的順序更佳。In the optical glass of the third embodiment, the upper limit of the mass ratio [TiO 2 /P 2 O 5 ] of the content of TiO 2 to the content of P 2 O 5 is preferably 0.70, and further in the order of 0.66, 0.64, and 0.62 Better. The lower limit of the mass ratio is preferably 0.25, and more preferably in the order of 0.28, 0.31, and 0.34.

藉由將質量比[TiO2 /P2 O5 ]設為上述範圍，容易得到具有期望的光學常數、且熱穩定性高的光學玻璃。By setting the mass ratio [TiO 2 /P 2 O 5 ] to the above range, it is easy to obtain an optical glass having a desired optical constant and high thermal stability.

在第3實施方式的光學玻璃中，TiO2 及Nb2 O5 的合計含量[TiO2 ＋Nb2 O5 ]的下限較佳為35.0%，進一步以37.0%、39.0%、40.0%的順序更佳。另外，該合計含量的上限較佳為65.0%，進一步以60.0%、55.0%、50.0%、48.0%、46.0%的順序更佳。In the optical glass of the third embodiment, the lower limit of the total content of TiO 2 and Nb 2 O 5 [TiO 2 +Nb 2 O 5 ] is preferably 35.0%, and more preferably in the order of 37.0%, 39.0%, 40.0% . In addition, the upper limit of the total content is preferably 65.0%, and more preferably in the order of 60.0%, 55.0%, 50.0%, 48.0%, and 46.0%.

從得到高折射率高分散、且玻璃的熱穩定性優異的玻璃的觀點考慮，該合計含量[TiO2 ＋Nb2 O5 ]較佳為上述範圍。From the viewpoint of obtaining a glass having a high refractive index, high dispersion, and excellent thermal stability of the glass, the total content [TiO 2 +Nb 2 O 5 ] is preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，Nb2 O5 的含量相對於Nb2 O5 及WO3 的合計含量的質量比[Nb2 O5 /(Nb2 O5 ＋WO3 )]的下限較佳為0.70，進一步以0.80、0.90、0.95的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, Nb 2 O 5 content with respect to the mass of Nb 2 O 5 and WO total content ratio of 3 [Nb 2 O 5 / (Nb 2 O 5 + WO 3)] the lower limit of the preferred It is 0.70, more preferably in the order of 0.80, 0.90, 0.95. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到高折射率高分散、且抑制了相對折射率溫度係數(dn/dT)的上升的玻璃的觀點考慮，質量比[Nb2 O5 /(Nb2 O5 ＋WO3 )]較佳為上述範圍。From the viewpoint of obtaining a glass with high refractive index and high dispersion and suppressed increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [Nb 2 O 5 /(Nb 2 O 5 +WO 3 )] is preferably the above range.

在第3實施方式的光學玻璃中，TiO2 的含量相對於TiO2 及WO3 的合計含量的質量比[TiO2 /(TiO2 ＋WO3 )]的下限較佳為0.70，進一步以0.80、0.90、0.95的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the embodiment 3, TiO 2 content with respect to the mass of the total content of TiO 2 and WO 3 ratio [TiO 2 / (TiO 2 + WO 3)] The lower limit is preferably 0.70, 0.80,0.90 is further The order of 0.95 is better. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到高分散、且抑制了相對折射率溫度係數(dn/dT)的上升的玻璃的觀點考慮，質量比[TiO2 /(TiO2 ＋WO3 )]較佳為上述範圍。From the viewpoint of obtaining a glass with high dispersion and suppressed increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [TiO 2 /(TiO 2 +WO 3 )] is preferably in the above range.

在第3實施方式的光學玻璃中，TiO2 及Nb2 O5 的合計含量相對於TiO2 、Nb2 O5 、WO3 、及Bi2 O3 的合計含量的質量比[(TiO2 ＋Nb2 O5 )/(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 )]的下限較佳為0.70，進一步以0.80、0.90、0.95的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, the mass ratio of the total content of TiO 2 and Nb 2 O 5 to the total content of TiO 2 , Nb 2 O 5 , WO 3 , and Bi 2 O 3 [(TiO 2 ＋Nb 2 The lower limit of O 5 )/(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 )] is preferably 0.70, and more preferably in the order of 0.80, 0.90, and 0.95. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到高折射率高分散、且抑制了相對折射率溫度係數(dn/dT)的上升的玻璃的觀點考慮，質量比[(TiO2 ＋Nb2 O5 )/(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 )]較佳為上述範圍。From the viewpoint of obtaining a glass with high refractive index and high dispersion and suppressed the increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [(TiO 2 ＋Nb 2 O 5 )/(TiO 2 ＋Nb 2 O 5 ＋WO 3 +Bi 2 O 3 )] is preferably in the above range.

在第3實施方式的光學玻璃中，Ta2 O5 的含量的上限較佳為10%，進一步以7%、5%、3%的順序更佳。另外，Ta2 O5 的含量的下限較佳為0%。Ta2 O5 的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of Ta 2 O 5 is preferably 10%, and more preferably in the order of 7%, 5%, and 3%. In addition, the lower limit of the content of Ta 2 O 5 is preferably 0%. The content of Ta 2 O 5 may also be 0%.

Ta2 O5 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。另一方面，Ta2 O5 使折射率上升，使玻璃高分散化。另外，Ta2 O5 的含量變多時，玻璃的熱穩定性降低、將玻璃熔融時，容易產生玻璃原料的熔融殘留物。因此，Ta2 O5 的含量較佳為上述範圍。此外，Ta2 O5 與其它玻璃成分相比，是非常昂貴的成分，Ta2 O5 的含量變多時，玻璃的生產成本增大。此外，Ta2 O5 與其它玻璃成分相比分子量大，因此會增大玻璃的比重，其結果，增大光學元件的重量。Ta 2 O 5 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. On the other hand, Ta 2 O 5 increases the refractive index and makes the glass highly dispersed. In addition, when the content of Ta 2 O 5 increases, the thermal stability of the glass decreases, and when the glass is melted, a molten residue of the glass raw material is likely to be generated. Therefore, the content of Ta 2 O 5 is preferably within the above-mentioned range. In addition, Ta 2 O 5 is a very expensive component compared to other glass components, and when the content of Ta 2 O 5 increases, the production cost of the glass increases. In addition, Ta 2 O 5 has a higher molecular weight than other glass components, and therefore increases the specific gravity of the glass, and as a result, increases the weight of the optical element.

在第3實施方式的光學玻璃中，Li2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。Li2 O的含量的下限較佳為0%。Li2 O的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of Li 2 O is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. The lower limit of the content of Li 2 O is preferably 0%. The content of Li 2 O may also be 0%.

Li2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Li2 O的含量變多時，耐失透性降低。因此，Li2 O的含量較佳為上述範圍。Li 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Li 2 O increases, the devitrification resistance decreases. Therefore, the content of Li 2 O is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Na2 O的含量的下限較佳為6%，進一步以10%、12%、13%的順序更佳。另外，Na2 O的含量的上限較佳為30%，進一步以22%、20%、19%、18%的順序更佳。In the optical glass of the third embodiment, the lower limit of the Na 2 O content is preferably 6%, and more preferably in the order of 10%, 12%, and 13%. In addition, the upper limit of the content of Na 2 O is preferably 30%, and more preferably in the order of 22%, 20%, 19%, and 18%.

Na2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熔融性、並且增大平均線性熱膨脹係數的作用。另一方面，Na2 O的含量變多時，耐失透性降低。因此，Na2 O的含量較佳為上述範圍。Na 2 O is a component that contributes to lowering the specific gravity of the glass, and has the effect of improving the meltability of the glass and increasing the average linear thermal expansion coefficient. On the other hand, when the content of Na 2 O increases, the devitrification resistance decreases. Therefore, the content of Na 2 O is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，K2 O的含量的下限較佳為1%，進一步以2%、3%、4%的順序更佳。另外，K2 O的含量的上限較佳為13%，進一步以12%、11%、10%的順序更佳。In the optical glass of the third embodiment, the lower limit of the K 2 O content is preferably 1%, and more preferably in the order of 2%, 3%, and 4%. In addition, the upper limit of the K 2 O content is preferably 13%, and more preferably in the order of 12%, 11%, and 10%.

K2 O是有助於玻璃的低比重化的成分，具有改善玻璃的熱穩定性的作用。而且，具有增大平均線性熱膨脹係數的作用。另一方面，K2 O的含量變多時，熱穩定性、耐失透性、化學耐久性、耐候性降低。因此，K2 O的含量較佳為上述範圍。K 2 O is a component that contributes to the lowering of the specific gravity of the glass, and has the effect of improving the thermal stability of the glass. Moreover, it has the effect of increasing the average linear thermal expansion coefficient. On the other hand, when the content of K 2 O increases, the thermal stability, devitrification resistance, chemical durability, and weather resistance decrease. Therefore, the content of K 2 O is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]的上限較佳為35%，進一步以30%、28%、26%、25%的順序更佳。另外，該合計含量的下限較佳為10%，進一步以14%、15%、16%、17%的順序更佳。In the optical glass of the third embodiment, the upper limit of the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O + Na 2 O + K 2 O] is preferably 35%, and 30%, 28%, 26% The order of% and 25% is better. In addition, the lower limit of the total content is preferably 10%, and more preferably in the order of 14%, 15%, 16%, and 17%.

Li2 O、Na2 O及K2 O均具有改善玻璃的熱穩定性的作用。然而，它們的含量變多時，存在化學耐久性、耐候性降低的擔憂。因此，Li2 O、Na2 O及K2 O的合計含量[Li2 O＋Na2 O＋K2 O]較佳為上述範圍。Li 2 O, Na 2 O, and K 2 O all have the effect of improving the thermal stability of glass. However, when their content increases, chemical durability and weather resistance may decrease. Therefore, the total content of Li 2 O, Na 2 O, and K 2 O [Li 2 O+Na 2 O+K 2 O] is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Cs2 O的含量的上限較佳為5%，進一步以3%、2%、1%的順序更佳。另外，Cs2 O的含量的下限較佳為0%。Cs2 O的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of Cs 2 O is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. In addition, the lower limit of the content of Cs 2 O is preferably 0%. The content of Cs 2 O may also be 0%.

Cs2 O具有改善玻璃的熔融性的作用，但含量變多時，玻璃的熱穩定性、折射率nd降低，而且在熔解中，玻璃成分的揮發增加，變得不能得到期望的玻璃。因此，Cs2 O的含量較佳為上述範圍。Cs 2 O has an effect of improving the meltability of the glass, but when the content increases, the thermal stability and refractive index nd of the glass decrease, and during melting, the volatilization of the glass component increases, and the desired glass cannot be obtained. Therefore, the content of Cs 2 O is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Na2 O的含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[Na2 O/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]的下限較佳為0.20，0.50、0.55、0.60、0.65的順序更佳。該質量比的上限較佳為0.98，進一步以0.95、0.92、0.90、0.88的順序更佳。In the optical glass of the third embodiment, Na 2 O content with respect to Li 2 O, Na 2 O, the quality of K 2 O, and the total content of Cs 2 O ratio of [Na 2 O / (Li 2 O + Na 2 O + K 2 The lower limit of O+Cs 2 O)] is preferably 0.20, and the order of 0.50, 0.55, 0.60, and 0.65 is more preferable. The upper limit of the mass ratio is preferably 0.98, and more preferably in the order of 0.95, 0.92, 0.90, and 0.88.

從得到耐失透性及熱穩定性優異的玻璃的觀點考慮，質量比[Na2 O/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]較佳為上述範圍。From the viewpoint of obtaining a glass excellent in devitrification resistance and thermal stability, the mass ratio [Na 2 O/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]的上限較佳為2.50，進一步以2.40、2.35、2.30、2.27、2.25的順序更佳。另外，該質量比的下限較佳為1.20，進一步以1.30、1.35、1.38、1.40的順序更佳。In the optical glass of the third embodiment, the mass ratio of the total content of P 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [( The upper limit of P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is preferably 2.50, and more preferably in the order of 2.40, 2.35, 2.30, 2.27, and 2.25. In addition, the lower limit of the mass ratio is preferably 1.20, and more preferably in the order of 1.30, 1.35, 1.38, and 1.40.

藉由將質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，可得到熱穩定性高、相對折射率溫度係數(dn/dT)低、且平均線性熱膨脹係數大的光學玻璃。By setting the mass ratio [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] to the above range, high thermal stability and relative refractive index temperature coefficient (dn /dT) Optical glass with low average linear thermal expansion coefficient.

在第3實施方式的光學玻璃中，MgO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，MgO的含量的下限較佳為0%。MgO的含量也可以為0%。In the optical glass of the third embodiment, the content of MgO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of MgO is preferably 0%. The content of MgO may also be 0%.

在第3實施方式的光學玻璃中，CaO的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，CaO的含量的下限較佳為0%。CaO的含量也可以為0%。In the optical glass of the third embodiment, the content of CaO is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of CaO is preferably 0%. The content of CaO may also be 0%.

在第3實施方式的光學玻璃中，SrO的含量較佳為6%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，SrO的含量的下限較佳為0%。In the optical glass of the third embodiment, the content of SrO is preferably 6% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of SrO is preferably 0%.

在第3實施方式的光學玻璃中，BaO的含量較佳為8%以下，進一步以5%以下、3%以下、1%以下的順序更佳。另外，BaO的含量的下限較佳為0%。In the optical glass of the third embodiment, the content of BaO is preferably 8% or less, and more preferably in the order of 5% or less, 3% or less, and 1% or less. In addition, the lower limit of the content of BaO is preferably 0%.

在第3實施方式的光學玻璃中，MgO、CaO、SrO、及BaO的合計含量[MgO＋CaO＋SrO＋BaO]的上限較佳為8.0%，進一步以5.0%、4.0%、3.0%、1.5%、1.0%、0.5%的順序更佳。另外，該合計含量的下限較佳為0%。該合計含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the total content of MgO, CaO, SrO, and BaO [MgO+CaO+SrO+BaO] is preferably 8.0%, and further to 5.0%, 4.0%, 3.0%, 1.5%, 1.0%, 0.5 The order of% is better. In addition, the lower limit of the total content is preferably 0%. The total content may be 0%.

MgO、CaO、SrO、BaO均為具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，這些玻璃成分的含量變多時，損害高分散性，另外，玻璃的熱穩定性及耐失透性降低。另外，BaO的含量過多時，玻璃的比重增大。因此，這些玻璃成分的各含量及合計含量較佳為上述範圍。MgO, CaO, SrO, and BaO are all glass components that improve the thermal stability and devitrification resistance of glass. However, when the content of these glass components increases, high dispersibility is impaired, and the thermal stability and devitrification resistance of the glass are reduced. In addition, when the content of BaO is too large, the specific gravity of the glass increases. Therefore, each content and total content of these glass components are preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，ZnO的含量的上限較佳為10%，進一步以6%、4%、3%的順序更佳。較佳為ZnO含量少的情況，其下限較佳為0%。ZnO的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of ZnO is preferably 10%, and more preferably in the order of 6%, 4%, and 3%. Preferably, the content of ZnO is small, and the lower limit is preferably 0%. The content of ZnO can also be 0%.

ZnO是具有改善玻璃的熱穩定性的作用玻璃成分。然而，ZnO的含量過多時，玻璃的比重增大，而且，相對折射率溫度係數(dn/dT)變高。因此，ZnO的含量較佳為上述範圍。ZnO is a glass component that has the effect of improving the thermal stability of glass. However, when the content of ZnO is too large, the specific gravity of the glass increases, and the relative refractive index temperature coefficient (dn/dT) increases. Therefore, the content of ZnO is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Na2 O的含量相對於Na2 O及ZnO的合計含量的質量比[Na2 O/(Na2 O＋ZnO)]的下限較佳為0.50，進一步以0.60、0.70、0.90的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, 2 O content of Na relative to the mass of the total content of Na 2 O and ZnO ratio of [Na 2 O / (Na 2 O + ZnO)] The lower limit is preferably 0.50, further to 0.60, The order of 0.70 and 0.90 is better. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從抑制玻璃的比重增大的、並且抑制相對折射率溫度係數(dn/dT)上升的觀點考慮，質量比[Na2 O/(Na2 O＋ZnO)]較佳為上述範圍。From the viewpoint of suppressing the increase in the specific gravity of the glass and suppressing the increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [Na 2 O/(Na 2 O+ZnO)] is preferably in the above range.

在第3實施方式的光學玻璃中，TiO2 的含量相對於TiO2 及ZnO的合計含量的質量比[TiO2 /(TiO2 ＋ZnO)]的下限較佳為0.70，進一步以0.80、0.90、0.95的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, the content of TiO 2 with respect to the total content of TiO 2 and ZnO in a mass ratio of [TiO 2 / (TiO 2 + ZnO)] The lower limit is preferably 0.70, further to 0.80,0.90,0.95 The order is better. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到高分散且抑制了相對折射率溫度係數(dn/dT)的上升的玻璃的觀點考慮，質量比[TiO2 /(TiO2 ＋ZnO)]較佳為上述範圍。From the viewpoint of obtaining a glass with high dispersion and suppressed increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [TiO 2 /(TiO 2 +ZnO)] is preferably in the above-mentioned range.

在第3實施方式的光學玻璃中，TiO2 及Nb2 O5 的合計含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及ZnO的合計含量的質量比[(TiO2 ＋Nb2 O5 )/(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋ZnO)]的下限較佳為0.70，進一步以0.80、0.90、0.95的順序更佳。另外，該質量比的上限較佳為1.00。該質量比也可以為1.00。In the optical glass of the third embodiment, the mass ratio of the total content of TiO 2 and Nb 2 O 5 to the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and ZnO [(TiO 2 ＋Nb The lower limit of 2 O 5 )/(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +ZnO)] is preferably 0.70, and more preferably in the order of 0.80, 0.90, and 0.95. In addition, the upper limit of the mass ratio is preferably 1.00. The mass ratio may also be 1.00.

從得到高折射率高分散、且抑制了相對折射率溫度係數(dn/dT)的上升的玻璃的觀點考慮，質量比[(TiO2 ＋Nb2 O5 )/(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋ZnO)]較佳為上述範圍。From the viewpoint of obtaining a glass with high refractive index and high dispersion and suppressed the increase in the relative refractive index temperature coefficient (dn/dT), the mass ratio [(TiO 2 ＋Nb 2 O 5 )/(TiO 2 ＋Nb 2 O 5 ＋WO 3 +Bi 2 O 3 +ZnO)] is preferably in the above range.

在第3實施方式的光學玻璃中，TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]較佳為1.10以下。該質量比的上限較佳為1.00，進一步以0.95、0.90、0.85、0.82、0.80的順序更佳。另外，該質量比的下限更佳為0.50，進一步以0.60、0.65、0.68、0.70的順序更佳。In the optical glass of the third embodiment, the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 The mass ratio of the total content of O 3 , Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 +SiO 2 +Al 2 O 3 +Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is preferably 1.10 or less. The upper limit of the mass ratio is preferably 1.00, and more preferably in the order of 0.95, 0.90, 0.85, 0.82, 0.80. In addition, the lower limit of the mass ratio is more preferably 0.50, and further more preferably in the order of 0.60, 0.65, 0.68, and 0.70.

藉由將質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]設為上述範圍，容易得到具有期望的光學常數的光學玻璃。By changing the mass ratio [(TiO 2 +Nb 2 O 5 +WO 3 +Bi 2 O 3 +Ta 2 O 5 )/(P 2 O 5 +B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O) ] When it is set to the above range, it is easy to obtain an optical glass having a desired optical constant.

在第3實施方式的光學玻璃中，ZrO2 的含量較佳為5%以下，進一步以3%以下、1%以下的順序更佳。另外，ZrO2 的含量的下限較佳為0%。In the optical glass of the third embodiment, the content of ZrO 2 is preferably 5% or less, and more preferably in the order of 3% or less and 1% or less. In addition, the lower limit of the content of ZrO 2 is preferably 0%.

ZrO2 是具有改善玻璃的熱穩定性及耐失透性的作用的玻璃成分。然而，ZrO2 的含量過多時，顯示出熱穩定性降低的傾向。因此，ZrO2 的含量較佳為上述範圍。ZrO 2 is a glass component that has the effect of improving the thermal stability and devitrification resistance of glass. However, when the content of ZrO 2 is too large, the thermal stability tends to decrease. Therefore, the content of ZrO 2 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Sc2 O3 的含量的上限較佳為2%。另外，Sc2 O3 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of Sc 2 O 3 is preferably 2%. In addition, the lower limit of the content of Sc 2 O 3 is preferably 0%.

在第3實施方式的光學玻璃中，HfO2 的含量的上限較佳為2%。另外，HfO2 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of HfO 2 is preferably 2%. In addition, the lower limit of the content of HfO 2 is preferably 0%.

Sc2 O3 、HfO2 均具有提高折射率nd的作用，而且是昂貴的成分。因此，Sc2 O3 、HfO2 的各含量較佳為上述範圍。Both Sc 2 O 3 and HfO 2 have the effect of increasing the refractive index nd, and are expensive components. Therefore, the respective contents of Sc 2 O 3 and HfO 2 are preferably within the above-mentioned ranges.

在第3實施方式的光學玻璃中，Lu2 O3 的含量的上限較佳為2%。另外，Lu2 O3 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of Lu 2 O 3 is preferably 2%. In addition, the lower limit of the content of Lu 2 O 3 is preferably 0%.

Lu2 O3 具有提高折射率nd的作用。另外，其分子量大，因此也是增加玻璃的比重的玻璃成分。因此，Lu2 O3 的含量較佳為上述範圍。Lu 2 O 3 has the effect of increasing the refractive index nd. In addition, since its molecular weight is large, it is also a glass component that increases the specific gravity of glass. Therefore, the content of Lu 2 O 3 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，GeO2 的含量的上限較佳為2%。另外，GeO2 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of GeO 2 is preferably 2%. In addition, the lower limit of the content of GeO 2 is preferably 0%.

GeO2 具有提高折射率nd的作用，而且是在通常使用的玻璃成分中特別地昂貴的成分。因此，從降低玻璃的製造成本的觀點考慮，GeO2 的含量較佳為上述範圍。GeO 2 has the effect of increasing the refractive index nd, and is a particularly expensive component among glass components commonly used. Therefore, from the viewpoint of reducing the manufacturing cost of glass, the content of GeO 2 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，La2 O3 的含量的上限較佳為2%。另外，La2 O3 的含量的下限較佳為0%。La2 O3 的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the content of La 2 O 3 is preferably 2%. In addition, the lower limit of the content of La 2 O 3 is preferably 0%. The content of La 2 O 3 may also be 0%.

La2 O3 的含量變多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，La2 O3 的含量較佳為上述範圍。When the content of La 2 O 3 increases, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. Therefore, the content of La 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and resistance to devitrification.

在第3實施方式的光學玻璃中，Gd2 O3 的含量的上限較佳為2%。另外，Gd2 O3 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the content of Gd 2 O 3 is preferably 2%. In addition, the lower limit of the content of Gd 2 O 3 is preferably 0%.

Gd2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低，在製造中，玻璃變得容易失透。另外，Gd2 O3 的含量過多時，玻璃的比重增大而不佳。因此，從良好地保持玻璃的熱穩定性及耐失透性、同時抑制比重的增大的觀點考慮，Gd2 O3 的含量較佳為上述範圍。When the content of Gd 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease, and the glass tends to become devitrified during production. In addition, when the content of Gd 2 O 3 is too large, the specific gravity of the glass increases and is unfavorable. Therefore, from the viewpoint of maintaining the thermal stability and devitrification resistance of the glass while suppressing an increase in specific gravity, the content of Gd 2 O 3 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，Y2 O3 的含量的上限較佳為2%。另外，Y2 O3 的含量的下限較佳為0%。Y2 O3 的含量也可以為0%。In the optical glass of the third embodiment, the upper limit of the Y 2 O 3 content is preferably 2%. In addition, the lower limit of the content of Y 2 O 3 is preferably 0%. The content of Y 2 O 3 may also be 0%.

Y2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。因此，從抑制熱穩定性及耐失透性的降低的觀點考慮，Y2 O3 的含量較佳為上述範圍。When the content of Y 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. Therefore, the content of Y 2 O 3 is preferably within the above-mentioned range from the viewpoint of suppressing a decrease in thermal stability and devitrification resistance.

在第3實施方式的光學玻璃中，Yb2 O3 的含量的上限較佳為2%。另外，Yb2 O3 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the Yb 2 O 3 content is preferably 2%. In addition, the lower limit of the content of Yb 2 O 3 is preferably 0%.

Yb2 O3 與La2 O3 、Gd2 O3 、Y2 O3 相比分子量大，因此會增大玻璃的比重。玻璃的比重增大時，光學元件的質量增大。例如，如果將質量大的透鏡導入自動對焦式的攝像透鏡，則自動對焦時，透鏡的驅動所需的電力增大，電池的消耗變得嚴重。因此，期望降低Yb2 O3 的含量，抑制玻璃的比重的增大。Yb 2 O 3 has a higher molecular weight than La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 , and therefore increases the specific gravity of glass. As the specific gravity of the glass increases, the quality of the optical element increases. For example, if a high-quality lens is introduced into an auto-focusing type imaging lens, the power required for driving the lens increases during auto-focusing, and the battery consumption becomes serious. Therefore, it is desirable to reduce the content of Yb 2 O 3 to suppress an increase in the specific gravity of the glass.

另外，Yb2 O3 的含量過多時，玻璃的熱穩定性及耐失透性降低。從防止玻璃的熱穩定性的降低、抑制比重的增大的觀點考慮，Yb2 O3 的含量較佳為上述範圍。In addition, when the content of Yb 2 O 3 is too large, the thermal stability and devitrification resistance of the glass decrease. From the viewpoints of preventing a decrease in the thermal stability of the glass and suppressing an increase in specific gravity, the content of Yb 2 O 3 is preferably within the above-mentioned range.

較佳為第3實施方式的光學玻璃主要以上述的玻璃成分、即作為必要成分的P2 O5 、Nb2 O5 、B2 O3 、TiO2 、Na2 O、K2 O、作為任意成分的Al2 O3 、SiO2 、WO3 、Bi2 O3 、Ta2 O5 、Li2 O、Cs2 O、MgO、CaO、SrO、BaO、ZnO、ZrO2 、Sc2 O3 、HfO2 、Lu2 O3 、GeO2 、La2 O3 、Gd2 O3 、Y2 O3 、及Yb2 O3 構成，上述的玻璃成分的合計含量較佳為95%以上、更佳為98%以上、進一步較佳為99%以上、更進一步較佳為99.5%以上。It is preferable that the optical glass of the third embodiment mainly includes the above-mentioned glass components, that is, P 2 O 5 , Nb 2 O 5 , B 2 O 3 , TiO 2 , Na 2 O, K 2 O, which are essential components, as arbitrary Composition Al 2 O 3 , SiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , Li 2 O, Cs 2 O, MgO, CaO, SrO, BaO, ZnO, ZrO 2 , Sc 2 O 3 , HfO 2. Lu 2 O 3 , GeO 2 , La 2 O 3 , Gd 2 O 3 , Y 2 O 3 , and Yb 2 O 3 , the total content of the above glass components is preferably 95% or more, more preferably 98 % Or more, more preferably 99% or more, still more preferably 99.5% or more.

在第3實施方式的光學玻璃中，TeO2 的含量的上限較佳為2%。另外，TeO2 的含量的下限較佳為0%。In the optical glass of the third embodiment, the upper limit of the TeO 2 content is preferably 2%. In addition, the lower limit of the TeO 2 content is preferably 0%.

TeO2 具有毒性，因此，較佳為減少TeO2 的含量。因此，TeO2 的含量較佳為上述範圍。TeO 2 is toxic, so it is better to reduce the content of TeO 2. Therefore, the content of TeO 2 is preferably within the above-mentioned range.

在第3實施方式的光學玻璃中，氟F的含量較佳為3%以下，其上限以1%、0.5%、0.3%的順序更佳。較佳為F的含量少的情況，其下限較佳為0%。F的含量也可以為0%。另外，較佳為實質上不含氟F。In the optical glass of the third embodiment, the content of fluorine F is preferably 3% or less, and the upper limit is more preferably in the order of 1%, 0.5%, and 0.3%. Preferably, when the content of F is small, the lower limit is preferably 0%. The content of F may also be 0%. In addition, it is preferred that fluorine F is not substantially contained.

藉由將F的含量設為上述範圍，可以抑制玻璃在熔解中的揮發，可以抑制折射率的變動、條紋。By setting the content of F in the above range, volatilization of the glass during melting can be suppressed, and fluctuations in refractive index and streaks can be suppressed.

需要說明的是，較佳為第3實施方式的光學玻璃基本上由上述玻璃成分構成，但也可以在不妨礙本發明的作用效果的範圍內含有其它成分。另外，在本發明中，不排除含有不可避免的雜質。In addition, it is preferable that the optical glass of 3rd Embodiment consists of the said glass component basically, but you may contain other components within the range which does not interfere with the effect of this invention. In addition, in the present invention, the inclusion of unavoidable impurities is not excluded.

＜其它成分組成＞ Pb、As、Cd、Tl、Be、Se均具有毒性。因此，較佳為第3實施方式的光學玻璃不含這些元素作為玻璃成分。＜Other component composition＞ Pb, As, Cd, Tl, Be, and Se are all toxic. Therefore, it is preferable that the optical glass of the third embodiment does not contain these elements as glass components.

U、Th、Ra均為放射性元素。因此，較佳為第3實施方式的光學玻璃不含這些元素作為玻璃成分。U, Th, and Ra are all radioactive elements. Therefore, it is preferable that the optical glass of the third embodiment does not contain these elements as glass components.

V、Cr、Mn、Fe、Co、Ni、Cu、Pr、Nd、Pm、Sm、Eu、Tb、Dy、Ho、Er、Tm可以增大玻璃的著色、成為螢光的發生源。因此，較佳為第3實施方式的光學玻璃不含這些元素作為玻璃成分。V, Cr, Mn, Fe, Co, Ni, Cu, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm can increase the coloring of glass and become a source of fluorescence. Therefore, it is preferable that the optical glass of the third embodiment does not contain these elements as glass components.

Sb(Sb2 O3 )、Ce(CeO2 )是作為澄清劑發揮功能的可以任意添加的元素。其中，Sb(Sb2 O3 )是澄清效果大的澄清劑。然而，Sb(Sb2 O3 )的氧化性強，如果增大Sb(Sb2 O3 )的添加量，則由於由Sb離子導致的光吸收，玻璃的著色增大而不佳。另外，將玻璃熔融時，如果熔融物中存在Sb，則會促進構成玻璃熔融坩堝的鉑對熔融物的溶出，玻璃中的鉑濃度變高。在玻璃中，鉑以離子的形式存在時，由於光的吸收，玻璃的著色增大。另外，在玻璃中，鉑以固體物質的形式存在時，成為光的散射源，會降低玻璃的品質。Ce(CeO2 )與Sb(Sb2 O3 )相比，澄清效果小。如果大量添加Ce(CeO2 )，則玻璃的著色增強。因此，在添加澄清劑的情況下，較佳為一邊注意添加量一邊添加Sb(Sb2 O3 )。Sb(Sb 2 O 3 ) and Ce(CeO 2 ) are arbitrarily added elements that function as fining agents. Among them, Sb (Sb 2 O 3 ) is a clarifying agent with a large clarifying effect. However, Sb (Sb 2 O 3 ) has strong oxidizing properties. If the addition amount of Sb (Sb 2 O 3 ) is increased, the coloration of the glass increases due to the light absorption caused by Sb ions. In addition, when the glass is melted, if Sb is present in the melt, the elution of the platinum constituting the glass melting crucible into the melt will be promoted, and the platinum concentration in the glass will increase. In glass, when platinum exists in the form of ions, the color of the glass increases due to the absorption of light. In addition, when platinum exists in the form of a solid substance in glass, it becomes a scattering source of light and degrades the quality of the glass. Ce(CeO 2 ) has a smaller clarifying effect than Sb(Sb 2 O 3 ). If Ce(CeO 2 ) is added in a large amount, the coloring of the glass is enhanced. Therefore, when adding a clarifier, it is preferable to add Sb (Sb 2 O 3 ) while paying attention to the addition amount.

將Sb2 O3 的含量設為外加比例表示。即，將除Sb2 O3 及CeO2 以外的全部玻璃成分的合計含量設為100質量%時，Sb2 O3 的含量較佳小於1質量%、更佳小於0.1質量%。進一步以小於0.05質量%、小於0.03質量%、小於0.02質量%、小於0.01%的順序較佳。Sb2 O3 的含量也可以為0質量%。The content of Sb 2 O 3 is expressed as an additional ratio. That is, when the total content of all glass components other than Sb 2 O 3 and CeO 2 is 100% by mass, the content of Sb 2 O 3 is preferably less than 1% by mass, more preferably less than 0.1% by mass. More preferably, the order is less than 0.05% by mass, less than 0.03% by mass, less than 0.02% by mass, and less than 0.01%. The content of Sb 2 O 3 may be 0% by mass.

將CeO2 的含量也設為外加比例表示。即，將除CeO2 、Sb2 O3 以外的全部玻璃成分的合計含量設為100質量%時，CeO2 的含量較佳小於2質量%、更佳小於1質量%、進一步較佳小於0.5質量%、更進一步較佳小於0.1質量%的範圍。CeO2 的含量也可以為0質量%。藉由將CeO2 的含量設為上述範圍，從而可以改善玻璃的澄清性。The content of CeO 2 is also expressed as an additional ratio. That is, when the total content of all glass components except CeO 2 and Sb 2 O 3 is 100% by mass, the content of CeO 2 is preferably less than 2% by mass, more preferably less than 1% by mass, and still more preferably less than 0.5% by mass. %. More preferably, the range is less than 0.1% by mass. The content of CeO 2 may also be 0% by mass. By setting the content of CeO 2 in the above range, the clarity of the glass can be improved.

(玻璃特性) 接下來，對第3實施方式的光學玻璃的特性進行說明。(Glass characteristics) Next, the characteristics of the optical glass of the third embodiment will be described.

＜折射率nd＞ 在第3實施方式的光學玻璃中，折射率nd較佳為1.63~1.80。折射率nd的下限可以為1.65、1.67、1.69、1.71或1.73，折射率nd的上限可以為1.79、1.78或1.77。＜Refractive index nd＞ In the optical glass of the third embodiment, the refractive index nd is preferably 1.63 to 1.80. The lower limit of the refractive index nd may be 1.65, 1.67, 1.69, 1.71, or 1.73, and the upper limit of the refractive index nd may be 1.79, 1.78, or 1.77.

可以藉由適宜調整各玻璃成分的含量而使折射率nd為期望的值。具有相對地提高折射率nd的作用的成分(高折射率化成分)為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 、La2 O3 等。另一方面，具有相對地降低折射率nd的作用的成分(低折射率化成分)為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O等。The refractive index nd can be a desired value by appropriately adjusting the content of each glass component. The components having the effect of relatively increasing the refractive index nd (high refractive index components) are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 , La 2 O 3 and the like. On the other hand, the components (low-refractive-index components) having the effect of relatively lowering the refractive index nd are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, and the like.

＜阿貝數νd＞ 在第3實施方式的光學玻璃中，阿貝數νd較佳為20~30。阿貝數νd的下限可以為22、22.5、23或23.2，阿貝數νd的上限可以為28、26或25。＜Abbe number νd＞ In the optical glass of the third embodiment, the Abbe number νd is preferably 20-30. The lower limit of the Abbe number νd can be 22, 22.5, 23, or 23.2, and the upper limit of the Abbe number νd can be 28, 26, or 25.

可以藉由適宜調整各玻璃成分的含量而使阿貝數νd為期望的值。阿貝數νd相對較低的成分、即高分散化成分為Nb2 O5 、TiO2 、WO3 、Bi2 O3 、Ta2 O5 、ZrO2 等。另一方面，阿貝數νd相對較高的成分、即低分散化成分為P2 O5 、SiO2 、B2 O3 、Li2 O、Na2 O、K2 O、La2 O3 、BaO、CaO、SrO等。The Abbe number νd can be adjusted to a desired value by appropriately adjusting the content of each glass component. Components with a relatively low Abbe number νd, that is, highly dispersed components, are Nb 2 O 5 , TiO 2 , WO 3 , Bi 2 O 3 , Ta 2 O 5 , ZrO 2 and the like. On the other hand, components with relatively high Abbe number νd, that is, low-dispersion components, are P 2 O 5 , SiO 2 , B 2 O 3 , Li 2 O, Na 2 O, K 2 O, La 2 O 3 , BaO, CaO, SrO, etc.

＜平均線性熱膨脹係數α＞ 在第3實施方式的光學玻璃中，100~300℃的平均線性熱膨脹係數α的下限較佳為100×10-7 ℃-1 ，進一步以102×10-7 ℃-1 、104×10-7 ℃-1 、106×10-7 ℃-1 、108×10-7 ℃-1 的順序更佳。另外，平均線性熱膨脹係數α的上限更佳為200×10-7 ℃-1 ，進一步以190×10-7 ℃-1 、180×10-7 ℃-1 、170×10-7 ℃-1 、160×10-7 ℃-1 、150×10-7 ℃-1 、145×10-7 ℃-1 的順序更佳。<Average linear thermal expansion coefficient α> In the optical glass of the third embodiment, the lower limit of the average linear thermal expansion coefficient α at 100 to 300°C is preferably 100×10 -7 ℃ -1 , and further 102×10 -7 ℃ - 1. The order of 104×10 -7 ℃ -1 , 106×10 -7 ℃ -1 , 108×10 -7 ℃ -1 is better. In addition, the upper limit of the average linear thermal expansion coefficient α is more preferably 200×10 -7 ℃ -1 , and further is 190×10 -7 ℃ -1 , 180×10 -7 ℃ -1 , 170×10 -7 ℃ -1 , The order of 160×10 -7 ℃ -1 , 150×10 -7 ℃ -1 , and 145×10 -7 ℃ -1 is better.

藉由將100~300℃的平均線性膨脹係數α設為上述範圍，可以抑制折射率伴隨著玻璃的熱膨脹的變化、即抑制相對折射率溫度係數dn/dT的增大。By setting the average linear expansion coefficient α of 100 to 300° C. in the above range, it is possible to suppress the change in the refractive index accompanying the thermal expansion of the glass, that is, the increase in the relative refractive index temperature coefficient dn/dT.

平均線性膨脹係數α基於JOGIS08-2003的規定來測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定溫度和試樣的伸長率。 需要說明的是，在本說明書中，將平均線性膨脹係數α用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，平均線性膨脹係數α的數值也相同。The average linear expansion coefficient α is determined based on the regulations of JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. Determine the temperature and the elongation of the sample. It should be noted that in this specification, the average linear expansion coefficient α is expressed in the unit of [°C -1 ], but when [K -1 ] is used as the unit, the numerical value of the average linear expansion coefficient α is also the same.

＜相對折射率溫度係數dn/dT＞ 在第3實施方式的光學玻璃中，He-Ne雷射的波長(633nm)下的相對折射率溫度係數dn/dT在20~40℃的範圍內較佳為-1.0×10-6 ~-13.0×10-6 ℃-1 ，進一步以-1.0×10-6 ~-10.0×10-6 ℃-1 、-1.3×10-6 ~-9.0×10-6 ℃-1 、-1.3×10-6 ~-8.0×10-6 ℃-1 、-1.5×10-6 ~-7.0×10-6 ℃-1 、-1.6×10-6 ~-6.5×10-6 ℃-1 的順序更佳。<Relative refractive index temperature coefficient dn/dT> In the optical glass of the third embodiment, the relative refractive index temperature coefficient dn/dT at the wavelength (633 nm) of the He-Ne laser is preferably in the range of 20 to 40°C It is -1.0×10 -6 ~-13.0×10 -6 ℃ -1 , further by -1.0×10 -6 ~-10.0×10 -6 ℃ -1 , -1.3×10 -6 ~-9.0×10 -6 ℃ -1, -1.3 × 10 -6 ~ -8.0 × 10 -6 ℃ -1, -1.5 × 10 -6 ~ -7.0 × 10 -6 ℃ -1, -1.6 × 10 -6 ~ -6.5 × 10 - The order of 6 ℃ -1 is better.

藉由將dn/dT設為上述範圍，並與dn/dT為正的光學元件組合，即使在光學元件的溫度大幅變動這樣的環境中，折射率的變動也小，因此，可以在更寬的溫度範圍中以高精度發揮期望的光學特性。By setting dn/dT in the above range and combining it with an optical element whose dn/dT is positive, even in an environment where the temperature of the optical element fluctuates greatly, the change in refractive index is small. Demonstrates the desired optical characteristics with high accuracy in the temperature range.

相對折射率溫度係數dn/dT基於JOGIS18-2008的干涉法來測定。 需要說明的是，在本說明書中，將溫度係數dn/dT用[℃-1 ]的單位表示，但在使用[K-1 ]作為單位的情況下，溫度係數dn/dT的數值也相同。The relative refractive index temperature coefficient dn/dT is measured based on the interferometry of JOGIS18-2008. It should be noted that in this specification, the temperature coefficient dn/dT is expressed in the unit of [°C -1 ], but when [K -1 ] is used as the unit, the value of the temperature coefficient dn/dT is also the same.

＜玻璃化轉變溫度Tg＞ 第3實施方式的光學玻璃的玻璃化轉變溫度Tg較佳為600℃以下，進一步以590℃以下、580℃以下、570℃以下、560℃以下的順序更佳。＜Glass transition temperature Tg＞ The glass transition temperature Tg of the optical glass of the third embodiment is preferably 600°C or lower, and more preferably in the order of 590°C or lower, 580°C or lower, 570°C or lower, and 560°C or lower.

藉由使玻璃化轉變溫度Tg的上限滿足上述範圍，可以抑制玻璃的成型溫度及退火溫度的上升，可以降低熱對壓製成型用設備及退火設備的損傷。另外，藉由使玻璃化轉變溫度Tg的下限滿足上述範圍，容易在保持期望的阿貝數、折射率的同時，良好地保持玻璃的熱穩定性。When the upper limit of the glass transition temperature Tg satisfies the above range, it is possible to suppress the increase in the molding temperature and annealing temperature of the glass, and it is possible to reduce the damage to the press molding equipment and the annealing equipment due to heat. In addition, by making the lower limit of the glass transition temperature Tg satisfy the above-mentioned range, it is easy to maintain the thermal stability of the glass while maintaining the desired Abbe number and refractive index.

＜玻璃的比重＞ 在第3實施方式的光學玻璃中，比重較佳為3.40以下，進一步以3.30以下、3.20以下的順序更佳。如果可以減少玻璃的比重，則可以減少透鏡的重量。其結果，可以降低搭載透鏡的相機透鏡的自動對焦驅動的消耗電力。＜Specific gravity of glass＞ In the optical glass of the third embodiment, the specific gravity is preferably 3.40 or less, and more preferably 3.30 or less and 3.20 or less in this order. If the specific gravity of the glass can be reduced, the weight of the lens can be reduced. As a result, it is possible to reduce the power consumption of the autofocus drive of the lens-mounted camera lens.

＜玻璃的透光性＞ 第3實施方式的光學玻璃的透光性可以藉由著色度λ5來評價。 對於厚度10.0mm±0.1mm的玻璃試樣，在波長200~700nm的範圍內測定分光透射率，將外部透射率成為5%的波長設為λ5。＜Transmittance of glass＞ The light transmittance of the optical glass of the third embodiment can be evaluated by the coloring degree λ5. For a glass sample with a thickness of 10.0 mm±0.1 mm, the spectral transmittance is measured in a wavelength range of 200 to 700 nm, and the wavelength at which the external transmittance becomes 5% is set to λ5.

第3實施方式的光學玻璃的λ5較佳為400nm以下，更佳為390nm以下，進一步較佳為385nm以下。The λ5 of the optical glass of the third embodiment is preferably 400 nm or less, more preferably 390 nm or less, and still more preferably 385 nm or less.

藉由使用將λ5短波長化後的光學玻璃，可以提供可實現適宜的顏色再現的光學元件。By using optical glass whose wavelength has been shortened to λ5, it is possible to provide optical elements that can achieve appropriate color reproduction.

對於第3實施方式的光學玻璃的製造及光學元件等製造，設為與第1實施方式同樣。The manufacture of the optical glass and the manufacture of optical elements and the like of the third embodiment are the same as those of the first embodiment.

以下，藉由實施例更具體地說明本發明，但本發明不僅限定於以下的實施例。需要說明的是，實施例1-1、1-2與第1實施方式對應，實施例2-1、2-2與第2實施方式對應，實施例3-1、3-2與第3實施方式對應。Hereinafter, the present invention will be explained more specifically with examples, but the present invention is not limited to the following examples. It should be noted that Examples 1-1 and 1-2 correspond to the first embodiment, Examples 2-1 and 2-2 correspond to the second embodiment, and Examples 3-1 and 3-2 correspond to the third embodiment. Correspondence.

(實施例1-1) [玻璃樣品的製作] 以成為具有表1-1~1-6中示出的試樣No.1~52的組成的玻璃的方式，稱量與各成分對應的化合物原料、即磷酸鹽、碳酸鹽、氧化物等原料，充分混合，製成了調配原料。將該調配原料投入鉑製坩堝，在大氣氣氛中加熱至900~1350℃，使其熔融，藉由攪拌使其均質化，進行澄清，得到了熔融玻璃。將該熔融玻璃鑄入成型模具，進行成型並緩慢冷卻，得到了塊狀的玻璃樣品。 需要說明的是，可以將調配原料投入石英玻璃製坩堝，熔融後轉移至鉑製坩堝，進一步進行加熱，使其熔融，藉由攪拌使其均質化，進行澄清，將得到的熔融玻璃鑄入成型模具，進行成型、緩慢冷卻。(Example 1-1) [Production of glass samples] Weigh the compound raw materials corresponding to each component, that is, raw materials such as phosphates, carbonates, oxides, etc., so as to become glass with the composition of sample Nos. 1 to 52 shown in Tables 1-1 to 1-6. , Fully mixed to make the blended raw materials. The prepared raw material was put into a platinum crucible, heated to 900 to 1350°C in an air atmosphere, melted, homogenized by stirring, and clarified to obtain molten glass. This molten glass was cast into a molding die, molded and slowly cooled, to obtain a bulk glass sample. It should be noted that the prepared raw materials can be put into a crucible made of quartz glass, melted and transferred to a crucible made of platinum, further heated to melt, homogenized by stirring, clarified, and the resulting molten glass is cast into molding The mold is formed and slowly cooled.

[玻璃樣品的評價] 對於得到的玻璃樣品，藉由以下示出的方法測定玻璃組成、比重、折射率nd、阿貝數νd、λ5、玻璃化轉變溫度Tg、相對折射率溫度係數dn/dT、平均線性膨脹係數α，將結果示於表1-1、1-2、1-4。[Evaluation of glass samples] For the obtained glass sample, the glass composition, specific gravity, refractive index nd, Abbe number νd, λ5, glass transition temperature Tg, relative refractive index temperature coefficient dn/dT, and average linear expansion coefficient α were measured by the methods shown below , The results are shown in Tables 1-1, 1-2, and 1-4.

〔1〕玻璃組成 對於得到的玻璃樣品，藉由電感耦合電漿原子發射光譜法(ICP-AES)測定了各玻璃成分的含量。〔1〕Glass composition For the obtained glass sample, the content of each glass component was measured by inductively coupled plasma atomic emission spectrometry (ICP-AES).

〔2〕比重 基於日本光學硝子工業會標準JOGIS-05進行了測定。〔2〕Proportion Measured based on JOGIS-05 standard of Japan Optical Glass Industry Association.

〔3〕折射率nd及阿貝數νd 基於日本光學硝子工業會標準JOGIS-01進行了測定。[3] Refractive index nd and Abbe number νd Measured based on the standard JOGIS-01 of the Japan Optical Glass Industry Association.

〔4〕λ5 將玻璃樣品加工成厚度10mm、且具有相互平行且經光學研磨的平面，測定在波長280nm~700nm的波長區的分光透射率。將垂直入射至經光學研磨的一個平面的光線的強度設為強度A，將從另一個平面出射的光線的強度設為強度B，計算出了分光透射率B/A。將分光透射率為5%的波長設為λ5。需要說明的是，分光透射率中也包括試樣表面的光線的反射損失。〔4〕λ5 The glass sample was processed into a thickness of 10 mm and had planes that were parallel to each other and optically polished, and the spectral transmittance in the wavelength region of 280 nm to 700 nm was measured. The intensity of light incident perpendicular to one of the optically polished planes was defined as intensity A, and the intensity of light emitted from the other plane was defined as intensity B, and the spectral transmittance B/A was calculated. Let λ5 be the wavelength at which the spectral transmittance is 5%. It should be noted that the spectral transmittance also includes the reflection loss of light on the surface of the sample.

〔5〕玻璃化轉變溫度Tg 玻璃化轉變溫度Tg使用NETZSCH JAPAN公司製造的差示掃描量熱分析裝置(DSC3300SA)，以升溫速度10℃/分進行了測定。〔5〕Glass transition temperature Tg The glass transition temperature Tg was measured using a differential scanning calorimeter (DSC3300SA) manufactured by NETZSCH JAPAN at a temperature increase rate of 10°C/min.

〔6〕相對折射率溫度係數dn/dT的測定 對於得到的玻璃樣品，基於JOGIS18-2008的干涉法進行了測定。光源使用波長633nm的He-Ne雷射，在溫度-70~150℃的範圍內連續地測定。測定結果中，將20℃~40℃的範圍的dn/dT值示於表1-1、1-2、1-4。〔6〕Measurement of relative refractive index temperature coefficient dn/dT The obtained glass samples were measured based on the interference method of JOGIS18-2008. The light source uses a He-Ne laser with a wavelength of 633 nm, and the temperature is continuously measured in the range of -70 to 150°C. In the measurement results, the dn/dT values in the range of 20°C to 40°C are shown in Tables 1-1, 1-2, and 1-4.

〔7〕平均線性膨脹係數α的測定 100~300℃的平均線性膨脹係數α基於JOGIS08-2003的規定進行了測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定了溫度和試樣的伸長率。[7] Determination of the average linear expansion coefficient α The average linear expansion coefficient α from 100 to 300°C is measured based on JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. The temperature and the elongation of the sample were measured.

[表1-1]

Figure 02_image001
[Table 1-1]
Figure 02_image001

[表1-2]

Figure 02_image003
[Table 1-2]
Figure 02_image003

[表1-3]

Figure 02_image005
[Table 1-3]
Figure 02_image005

[表1-4]

Figure 02_image007
[Table 1-4]
Figure 02_image007

[表1-5]

Figure 02_image009
[Table 1-5]
Figure 02_image009

[表1-6]

Figure 02_image011
[Table 1-6]
Figure 02_image011

(實施例1-2) 對實施例1中得到的玻璃樣品切斷、磨削，製作了碎片。將碎片藉由再熱壓製而壓製成型，製作了光學元件坯料。對光學元件坯料進行精密退火，以成為所需的折射率的方式精密地調整了折射率後，藉由公知的方法進行磨削、研磨，由此得到雙凸透鏡、雙凹透鏡、平凸透鏡、平凹透鏡、凹彎月透鏡、凸彎月透鏡等各種透鏡。(Example 1-2) The glass sample obtained in Example 1 was cut and ground to produce fragments. The fragments were press-formed by reheating and pressing, and an optical element blank was produced. The optical element blanks are precisely annealed, the refractive index is precisely adjusted so that the refractive index becomes the required refractive index, and then ground and polished by a known method to obtain biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. , Concave meniscus lens, convex meniscus lens and other lenses.

(實施例2-1) [玻璃樣品的製作] 以成為具有表2-1中示出的試樣No.2-1~2-8的組成的玻璃的方式，稱量與各成分對應的化合物原料、即磷酸鹽、碳酸鹽、氧化物等原料，充分混合，製成了調配原料。將該調配原料投入鉑製坩堝，在大氣氣氛中加熱至900~1350℃，使其熔融，藉由攪拌使其均質化，進行澄清，得到了熔融玻璃。將該熔融玻璃鑄入成型模具，進行成型並緩慢冷卻，得到了塊狀的玻璃樣品。 需要說明的是，可以將調配原料投入石英玻璃製坩堝，熔融後轉移至鉑製坩堝，進一步進行加熱，使其熔融，藉由攪拌使其均質化，進行澄清，將得到的熔融玻璃鑄入成型模具，進行成型、緩慢冷卻。(Example 2-1) [Production of glass samples] Weigh the compound raw materials corresponding to each component, that is, raw materials such as phosphates, carbonates, oxides, etc. so as to become glass with the composition of Sample Nos. 2-1 to 2-8 shown in Table 2-1 , Fully mixed to make the blended raw materials. The prepared raw material was put into a platinum crucible, heated to 900 to 1350°C in an air atmosphere, melted, homogenized by stirring, and clarified to obtain molten glass. This molten glass was cast into a molding die, molded and slowly cooled, to obtain a bulk glass sample. It should be noted that the prepared raw materials can be put into a crucible made of quartz glass, melted and transferred to a crucible made of platinum, further heated to melt, homogenized by stirring, clarified, and the resulting molten glass is cast into molding The mold is formed and slowly cooled.

[玻璃樣品的評價] 對於得到的玻璃樣品，藉由以下示出的方法測定了玻璃組成、折射率nd、阿貝數νd、λ5、玻璃化轉變溫度Tg、平均線性膨脹係數α、相對折射率溫度係數dn/dT、比重，將結果示於表2-3。[Evaluation of glass samples] For the obtained glass sample, the glass composition, refractive index nd, Abbe number νd, λ5, glass transition temperature Tg, average linear expansion coefficient α, relative refractive index temperature coefficient dn/dT, Specific gravity, the results are shown in Table 2-3.

〔1〕玻璃組成 對於得到的玻璃樣品，藉由電感耦合電漿原子發射光譜法(ICP-AES)測定了各玻璃成分的含量。需要說明的是，在表2-3所示的No.2-1~2-8的全部玻璃樣品中，F的含量為0%。〔1〕Glass composition For the obtained glass sample, the content of each glass component was measured by inductively coupled plasma atomic emission spectrometry (ICP-AES). It should be noted that in all the glass samples No.2-1 to 2-8 shown in Table 2-3, the content of F is 0%.

〔2〕比重 基於日本光學硝子工業會標準JOGIS-05進行了測定。〔2〕Proportion Measured based on JOGIS-05 standard of Japan Optical Glass Industry Association.

〔3〕折射率nd及阿貝數νd 基於日本光學硝子工業會標準JOGIS-01進行了測定。[3] Refractive index nd and Abbe number νd Measured based on the standard JOGIS-01 of the Japan Optical Glass Industry Association.

〔4〕λ5 將玻璃樣品加工成厚度10mm、且具有相互平行且經光學研磨的平面，測定在波長280nm~700nm的波長區的分光透射率。將垂直入射至經光學研磨的一個平面的光線的強度設為強度A，將從另一個平面出射的光線的強度設為強度B，計算出了分光透射率B/A。將分光透射率為5%的波長設為λ5。需要說明的是，分光透射率中也包括試樣表面的光線的反射損失。〔4〕λ5 The glass sample was processed into a thickness of 10 mm and had planes that were parallel to each other and optically polished, and the spectral transmittance in the wavelength region of 280 nm to 700 nm was measured. The intensity of light incident perpendicular to one of the optically polished planes was defined as intensity A, and the intensity of light emitted from the other plane was defined as intensity B, and the spectral transmittance B/A was calculated. Let λ5 be the wavelength at which the spectral transmittance is 5%. It should be noted that the spectral transmittance also includes the reflection loss of light on the surface of the sample.

〔5〕玻璃化轉變溫度Tg 玻璃化轉變溫度Tg使用NETZSCH JAPAN公司製造的差示掃描量熱分析裝置(DSC3300SA)，以升溫速度10℃/分進行了測定。〔5〕Glass transition temperature Tg The glass transition temperature Tg was measured using a differential scanning calorimeter (DSC3300SA) manufactured by NETZSCH JAPAN at a temperature increase rate of 10°C/min.

〔6〕相對折射率溫度係數dn/dT的測定 對於得到的玻璃樣品，基於JOGIS18-2008的干涉法進行了測定。光源使用波長633nm的He-Ne雷射，在溫度-70~150℃的範圍內連續地測定。測定結果中，將20℃~40℃的範圍的dn/dT值示於表2-3。〔6〕Measurement of relative refractive index temperature coefficient dn/dT The obtained glass samples were measured based on the interference method of JOGIS18-2008. The light source uses a He-Ne laser with a wavelength of 633 nm, and the temperature is continuously measured in the range of -70 to 150°C. In the measurement results, the dn/dT values in the range of 20°C to 40°C are shown in Table 2-3.

〔7〕平均線性膨脹係數α的測定 100~300℃的平均線性膨脹係數α基於JOGIS08-2003的規定進行了測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定了溫度和試樣的伸長率。[7] Determination of the average linear expansion coefficient α The average linear expansion coefficient α from 100 to 300°C is measured based on JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. The temperature and the elongation of the sample were measured.

[表2-1]

Figure 02_image013
[table 2-1]
Figure 02_image013

[表2-2]

Figure 02_image015
[Table 2-2]
Figure 02_image015

[表2-3]

Figure 02_image017
[Table 2-3]
Figure 02_image017

(實施例2-2) 對實施例2-1中得到的玻璃樣品切斷、磨削，製作了碎片。將碎片藉由再熱壓製而壓製成型，製作了光學元件坯料。對光學元件坯料進行精密退火，以成為所需的折射率的方式精密地調整了折射率後，藉由公知的方法進行磨削、研磨，由此得到雙凸透鏡、雙凹透鏡、平凸透鏡、平凹透鏡、凹彎月透鏡、凸彎月透鏡等各種透鏡。(Example 2-2) The glass sample obtained in Example 2-1 was cut and ground to produce fragments. The fragments were press-formed by reheating and pressing, and an optical element blank was produced. The optical element blanks are precisely annealed, the refractive index is precisely adjusted so that the refractive index becomes the required refractive index, and then ground and polished by a known method to obtain biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. , Concave meniscus lens, convex meniscus lens and other lenses.

(實施例3-1) [玻璃樣品的製作] 以成為具有表3-1中示出的試樣No.3-1~3-8的組成的玻璃的方式，稱量與各成分對應的化合物原料、即磷酸鹽、碳酸鹽、氧化物等原料，充分混合，製成了調配原料。將該調配原料投入鉑製坩堝，在大氣氣氛中加熱至900~1350℃，使其熔融，藉由攪拌使其均質化，進行澄清，得到了熔融玻璃。將該熔融玻璃鑄入成型模具，進行成型並緩慢冷卻，得到了塊狀的玻璃樣品。 需要說明的是，可以將調配原料投入石英玻璃製坩堝，熔融後轉移至鉑製坩堝，進一步進行加熱，使其熔融，藉由攪拌使其均質化，進行澄清，將得到的熔融玻璃鑄入成型模具，進行成型、緩慢冷卻。(Example 3-1) [Production of glass samples] Weigh the compound raw materials corresponding to each component, that is, raw materials such as phosphates, carbonates, oxides, etc. so as to become glass with the composition of sample Nos. 3-1 to 3-8 shown in Table 3-1. , Fully mixed to make the blended raw materials. The prepared raw material was put into a platinum crucible, heated to 900 to 1350°C in an air atmosphere, melted, homogenized by stirring, and clarified to obtain molten glass. This molten glass was cast into a molding die, molded and slowly cooled, to obtain a bulk glass sample. It should be noted that the prepared raw materials can be put into a crucible made of quartz glass, melted and transferred to a crucible made of platinum, further heated to melt, homogenized by stirring, clarified, and the resulting molten glass is cast into molding The mold is formed and slowly cooled.

[玻璃樣品的評價] 對於得到的玻璃樣品，藉由以下示出的方法測定了玻璃組成、折射率nd、阿貝數νd、λ5、玻璃化轉變溫度Tg、平均線性膨脹係數α、相對折射率溫度係數dn/dT、比重，將結果示於表3-1。[Evaluation of glass samples] For the obtained glass sample, the glass composition, refractive index nd, Abbe number νd, λ5, glass transition temperature Tg, average linear expansion coefficient α, relative refractive index temperature coefficient dn/dT, Specific gravity, the results are shown in Table 3-1.

〔1〕玻璃組成 對於得到的玻璃樣品，藉由電感耦合電漿原子發射光譜法(ICP-AES)測定了各玻璃成分的含量。需要說明的是，在表3-1所示的No.3-1~3-8的全部玻璃樣品中，F的含量為0%。〔1〕Glass composition For the obtained glass sample, the content of each glass component was measured by inductively coupled plasma atomic emission spectrometry (ICP-AES). It should be noted that in all the glass samples No. 3-1 to 3-8 shown in Table 3-1, the content of F is 0%.

〔2〕比重 基於日本光學硝子工業會標準JOGIS-05進行了測定。〔2〕Proportion Measured based on JOGIS-05 standard of Japan Optical Glass Industry Association.

〔3〕折射率nd及阿貝數νd 基於日本光學硝子工業會標準JOGIS-01進行了測定。[3] Refractive index nd and Abbe number νd Measured based on the standard JOGIS-01 of the Japan Optical Glass Industry Association.

〔4〕λ5 將玻璃樣品加工成厚度10mm、且具有相互平行且經光學研磨的平面，測定在波長280nm~700nm的波長區的分光透射率。將垂直入射至經光學研磨的一個平面的光線的強度設為強度A，將從另一個平面出射的光線的強度設為強度B，計算出了分光透射率B/A。將分光透射率為5%的波長設為λ5。需要說明的是，分光透射率中也包括試樣表面的光線的反射損失。〔4〕λ5 The glass sample was processed into a thickness of 10 mm and had planes that were parallel to each other and optically polished, and the spectral transmittance in the wavelength region of 280 nm to 700 nm was measured. The intensity of light incident perpendicular to one of the optically polished planes was defined as intensity A, and the intensity of light emitted from the other plane was defined as intensity B, and the spectral transmittance B/A was calculated. Let λ5 be the wavelength at which the spectral transmittance is 5%. It should be noted that the spectral transmittance also includes the reflection loss of light on the surface of the sample.

〔5〕玻璃化轉變溫度Tg 玻璃化轉變溫度Tg使用熱機械分析裝置(TMA)(MAC Science製、TMA-4000S)，以升溫速度4℃/分進行了測定。〔5〕Glass transition temperature Tg The glass transition temperature Tg was measured using a thermomechanical analyzer (TMA) (manufactured by MAC Science, TMA-4000S) at a temperature increase rate of 4°C/min.

〔6〕相對折射率溫度係數dn/dT的測定 對於得到的玻璃樣品，基於JOGIS18-2008的干涉法進行了測定。光源使用波長633nm的He-Ne雷射，在溫度-70~150℃的範圍內連續地測定。測定結果中，將20℃~40℃的範圍的dn/dT值示於表3-1。〔6〕Measurement of relative refractive index temperature coefficient dn/dT The obtained glass samples were measured based on the interference method of JOGIS18-2008. The light source uses a He-Ne laser with a wavelength of 633 nm, and the temperature is continuously measured in the range of -70 to 150°C. In the measurement results, the dn/dT values in the range of 20°C to 40°C are shown in Table 3-1.

〔7〕平均線性膨脹係數α的測定 100~300℃的平均線性膨脹係數α基於JOGIS08-2003的規定進行了測定。其中，將試樣設為長度20mm±0.5mm、直徑5mm±0.5mm的圓桿，在對試樣施加了98mN的負載的狀態下，藉由以每分鐘4℃的恆定速度上升的方式加熱，測定了溫度和試樣的伸長率。[7] Determination of the average linear expansion coefficient α The average linear expansion coefficient α from 100 to 300°C is measured based on JOGIS08-2003. Among them, the sample is a round rod with a length of 20mm±0.5mm and a diameter of 5mm±0.5mm, and the sample is heated at a constant rate of 4°C per minute while a load of 98mN is applied to the sample. The temperature and the elongation of the sample were measured.

[表3-1]

Figure 02_image019
[Table 3-1]
Figure 02_image019

(實施例3-2) 對實施例3-1中得到的玻璃樣品切斷、磨削，製作了碎片。將碎片藉由再熱壓製而壓製成型，製作了光學元件坯料。對光學元件坯料進行精密退火，以成為所需的折射率的方式精密地調整了折射率後，藉由公知的方法進行磨削、研磨，由此得到雙凸透鏡、雙凹透鏡、平凸透鏡、平凹透鏡、凹彎月透鏡、凸彎月透鏡等各種透鏡。(Example 3-2) The glass sample obtained in Example 3-1 was cut and ground to produce fragments. The fragments were press-formed by reheating and pressing, and an optical element blank was produced. The optical element blanks are precisely annealed, the refractive index is precisely adjusted so that the refractive index becomes the required refractive index, and then ground and polished by a known method to obtain biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. , Concave meniscus lens, convex meniscus lens and other lenses.

應該理解的是，本次公開的實施方式全部是示例性的，並不構成限制。本發明的範圍由申請專利範圍所示，而不是上述的說明界定，旨在包括與申請專利範圍均等的含義及範圍內的全部變更。It should be understood that the embodiments disclosed this time are all exemplary and do not constitute a limitation. The scope of the present invention is shown by the scope of the patent application, not defined by the above description, and is intended to include the meaning and all changes within the scope equivalent to the scope of the patent application.

例如，藉由對上述示例出的玻璃組成進行了說明書中記載的組成調整，可製作本發明的一態樣的光學玻璃。 另外，當然可以將說明書中示例出的或作為較佳的範圍記載的事項中的2個以上任意組合。For example, by adjusting the composition described in the specification to the glass composition exemplified above, an optical glass of one aspect of the present invention can be produced. In addition, it is of course possible to arbitrarily combine two or more of the items exemplified in the specification or described as preferred ranges.

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Claims (9)

一種光學玻璃，其折射率nd為1.63~1.80， 阿貝數νd為22~34， Nb2 O5 的含量為25~55質量%， WO3 的含量小於30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為36~60質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.10以下， TiO2 的含量相對於P2 O5 及B2 O3 的合計含量的質量比[TiO2 /(P2 O5 ＋B2 O3 )]為0.50以下， 且滿足下述(A)或(B)： (A) P2 O5 的含量為20~36質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.50以下， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為8.0質量%以下； (B) P2 O5 的含量為25~38質量%， Al2 O3 的含量小於5質量%， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， MgO、CaO、SrO及BaO的合計含量[MgO＋CaO＋SrO＋BaO]為7.0質量%以下， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上。An optical glass, the refractive index nd is 1.63~1.80, the Abbe number νd is 22~34, the content of Nb 2 O 5 is 25~55 mass%, the content of WO 3 is less than 30 mass%, TiO 2 , Nb 2 O 5. The total content of WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 36-60% by mass, TiO 2 , Nb 2 O 5 , The total content of WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , SiO 2 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, and Cs 2 O The mass ratio of the total content [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 ＋B 2 O 3 ＋SiO 2 ＋Al 2 O 3 ＋Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O )] is 1.10 or less, the content of TiO 2 with respect to the total content of P 2 O 5 and B 2 O 3 mass ratio of [TiO 2 / (P 2 O 5 + B 2 O 3)] is 0.50 or less, and satisfies the following (A) or (B): (A) The content of P 2 O 5 is 20 to 36% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 O, K The mass ratio of the total content of 2 O and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.50 or less, and the content of B 2 O 3 is relative to The mass ratio of the content of P 2 O 5 [B 2 O 3 /P 2 O 5 ] is 0.05 to 0.39, and the total content of MgO, CaO, SrO, and BaO [MgO＋CaO＋SrO＋BaO] is 8.0 mass% or less; (B) P 2 O The content of 5 is 25 to 38% by mass, the content of Al 2 O 3 is less than 5% by mass, and the total content of P 2 O 5 , B 2 O 3 and SiO 2 is relative to Li 2 O, Na 2 O, K 2 O and The mass ratio of the total content of Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 )/(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, and the total content of MgO, CaO, SrO and BaO [ MgO＋CaO＋SrO＋BaO] is 7.0% by mass or less, and the content of TiO 2 is relative to that of TiO 2 The mass ratio of the total content of, Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 or more . 如請求項1所述的光學玻璃，其中， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.00以上。The optical glass according to claim 1, wherein the mass ratio of the total content of P 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 +B 2 O 3 +SiO 2 )/(Li 2 O+Na 2 O+K 2 O+Cs 2 O)] is 1.00 or more. 如請求項1或2所述的光學玻璃，其中， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量相對於P2 O5 、B2 O3 、SiO2 、Al2 O3 、Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )/(P2 O5 ＋B2 O3 ＋SiO2 ＋Al2 O3 ＋Li2 O＋Na2 O＋K2 O＋Cs2 O)]為0.50以上。The optical glass according to claim 1 or 2, wherein the total content of TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 is relative to P 2 O 5 , B 2 O 3 , and SiO 2. The mass ratio of the total content of Al 2 O 3 , Li 2 O, Na 2 O, K 2 O and Cs 2 O [(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )/(P 2 O 5 + B 2 O 3 + SiO 2 + Al 2 O 3 + Li 2 O + Na 2 O + K 2 O + Cs 2 O)] is 0.50 or more. 一種光學玻璃，其中， P2 O5 的含量為25~50質量%， TiO2 的含量為10~50質量%， Nb2 O5 含量為5~30質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60質量%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， P2 O5 、B2 O3 及SiO2 的合計含量相對於Li2 O、Na2 O、K2 O及Cs2 O的合計含量的質量比[(P2 O5 ＋B2 O3 ＋SiO2 )/(Li2 O＋Na2 O＋K2 O＋Cs2 O)]為1.80以下， 且滿足下述(A)或(B)： (A) WO3 的含量為7質量%以下； (B) 實質上不含F。An optical glass, wherein the content of P 2 O 5 is 25-50% by mass, the content of TiO 2 is 10-50% by mass, the content of Nb 2 O 5 is 5-30% by mass, and the content of TiO 2 , Nb 2 O 5 , The total content of WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60% by mass, and the content of TiO 2 is relative to TiO 2 , Nb The mass ratio of the total content of 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O 5 [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] is 0.25 or more, P The mass ratio of the total content of 2 O 5 , B 2 O 3 and SiO 2 to the total content of Li 2 O, Na 2 O, K 2 O, and Cs 2 O [(P 2 O 5 ＋B 2 O 3 ＋SiO 2 ) /(Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O)] is 1.80 or less, and satisfies the following (A) or (B): (A) The content of WO 3 is 7% by mass or less; (B) substantially no F . 一種光學玻璃，其中， P2 O5 的含量為25~50質量%， Nb2 O5 含量為14~40質量%， TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量[TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 ]為35~60質量%， TiO2 的含量相對於TiO2 、Nb2 O5 、WO3 、Bi2 O3 及Ta2 O5 的合計含量的質量比[TiO2 /(TiO2 ＋Nb2 O5 ＋WO3 ＋Bi2 O3 ＋Ta2 O5 )]為0.25以上， B2 O3 的含量相對於P2 O5 的含量的質量比[B2 O3 /P2 O5 ]為0.05~0.39， Li2 O、Na2 O、K2 O及Cs2 O的合計含量[Li2 O＋Na2 O＋K2 O＋Cs2 O]為10質量%以上， Na2 O的含量相對於K2 O的含量的質量比[Na2 O/K2 O]為1.50以上。An optical glass, wherein the content of P 2 O 5 is 25-50% by mass, the content of Nb 2 O 5 is 14-40% by mass, TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 and Ta 2 O The total content of 5 [TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 ] is 35-60% by mass, and the content of TiO 2 is relative to TiO 2 , Nb 2 O 5 , WO 3 , Bi 2 O 3 The mass ratio [TiO 2 /(TiO 2 ＋Nb 2 O 5 ＋WO 3 ＋Bi 2 O 3 ＋Ta 2 O 5 )] of the total content of Ta 2 O 5 and Ta 2 O 5 is 0.25 or more, and the content of B 2 O 3 is relative to P 2 O 5 The mass ratio of the content of [B 2 O 3 /P 2 O 5 ] is 0.05~0.39, the total content of Li 2 O, Na 2 O, K 2 O and Cs 2 O [Li 2 O＋Na 2 O＋K 2 O＋Cs 2 O] less than 10 mass%, Na 2 O content of the mass content of K 2 O ratio of [Na 2 O / K 2 O ] of 1.50 or more. 如請求項5所述的光學玻璃，其實質上不含F。The optical glass described in claim 5 does not substantially contain F. 2、4~6中任一項所述的光學玻璃，其在100~300℃的平均線性熱膨脹係數α為100×10-7 ~200×10-7 ℃-1 。2. The optical glass according to any one of 4 to 6, having an average linear thermal expansion coefficient α at 100 to 300°C of 100×10 -7 to 200×10 -7 ℃ -1 . 2、4~6中任一項所述的光學玻璃，其在He-Ne雷射的波長(633nm)下的相對折射率溫度係數dn/dT在20~40℃的範圍內為-0.1×10-6 ~-13.0×10-6 ℃-1 。2. The optical glass according to any one of 4 to 6, the relative refractive index temperature coefficient dn/dT at the wavelength of He-Ne laser (633nm) is -0.1×10 in the range of 20-40℃ -6 ~-13.0×10 -6 ℃ -1 . 一種光學元件，其由如請求項1~8中任一項所述的光學玻璃製成。An optical element, which is made of the optical glass according to any one of claims 1 to 8.
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