CN107986616A - Optical glass and optical element - Google Patents

Optical glass and optical element Download PDF

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Publication number
CN107986616A
CN107986616A CN201711222708.1A CN201711222708A CN107986616A CN 107986616 A CN107986616 A CN 107986616A CN 201711222708 A CN201711222708 A CN 201711222708A CN 107986616 A CN107986616 A CN 107986616A
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component
glass
optical
oxide
converted
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CN201711222708.1A
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Chinese (zh)
Inventor
桃野净行
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株式会社小原
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Priority to JP2010-186195 priority Critical
Priority to JP2010186195 priority
Priority to JP2011100215 priority
Priority to JP2011-100215 priority
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Priority to CN2011102438229A priority patent/CN102372430A/en
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made

Abstract

The present invention relates to optical glass and optical element, can more inexpensively provide refractive index (nd) and Abbe number (νd) in desired scope and optical glass that devitrification resistance is high.A kind of optical glass, relative to the glass gross mass formed to convert with oxide, in terms of quality %, contains 1.0~30.0% B2O3Component and 10.0~50.0% La2O3Component and Ta2O5The content of component is less than 20.0%, it has more than 1.80 refractive index (nd) and with more than 35 and less than 50 Abbe number (νd).The optical element is using the optical glass as mother metal.

Description

Optical glass and optical element

It is on 08 23rd, 2011, Application No. 201110243822.9 applying date that the application, which is, entitled " optics The divisional application of the application of glass and optical element ".

Technical field

The present invention relates to optical glass and optical element.

Background technology

In recent years, rapidly developed using the digitlization of instrument of optical system, high-definition, in digital camera, shooting In the various optical instrument fields such as machine etc. pinch image reproducing such as shadow instrument, projecting apparatus, projection TV (projection) instrument, there is an urgent need to The lens used in optical system, the quantity of the optical element such as prism are reduced, so that optical system entirety lightweight and small Type.

In the optical glass for making optical element, particularly to the lightweight of optical system entirety and miniaturization can be sought , have more than 1.80 refractive index (nd) and with more than 35 and less than 50 Abbe number (νd) high-refractivity and low-dispersion glass The demand of glass is very vigorous.As this high-refractivity and low-dispersion glass, it is known to one kind with patent document 1~4 for representative Glass composition.

Prior art literature

Patent document

Patent document 1:Japanese Unexamined Patent Publication 2001-348244 publications

Patent document 2:Japanese Unexamined Patent Publication 2006-016293 publications

Patent document 3:Japanese Unexamined Patent Publication 2009-102215 publications

Patent document 4:Japanese Unexamined Patent Publication 2009-203083 publications

The content of the invention

Problems to be solved by the invention

As the method that optical element is made by optical glass, for example, as it is known that having:To the drop that is formed by optical glass or Glass blocks is ground and is ground, so as to obtain the method for the shape of optical element;The drop or glass that will be formed by optical glass Glass block reheats, shaping (reheating is compressing), and the method that gained glass forming body is ground and is ground;And use Mould through Ultra-precision Turning will be molded (precise compression molding) by the preforming blank material of drop or glass blocks acquisition, so as to obtain The method of the shape of optical element.No matter which kind of method, be required to when the frit by dissolving forms drop or glass blocks, Reduce the devitrification of formed glass.Here, if inside gained drop or glass blocks crystallization and devitrification occurs, just can not Obtain the glass suitable for optical element.

In addition, in order to reduce the material cost of optical glass, it is desirable to which the cost of material for forming each component of optical glass is use up May be cheap.In addition, in order to reduce the manufacture cost of optical glass, it is desirable to which the meltability of raw material is high, wishes it lower At a temperature of melt.However, the glass composition described in patent document 1~4 is difficult to fully tackle above-mentioned various requirement.

The present invention is to carry out in view of the above problems, it is intended that more inexpensively obtaining refractive index (nd) and Abbe Number (νd) in desired scope and glass that devitrification resistance is high.

The solution used to solve the problem

The inventors of the present invention have made intensive studies to solve the above problems, it turns out that, by containing B2O3Component and La2O3The glass of component reduces Ta2O5The content of component, with desired refractive index and while Abbe number, glass Material cost is reduced, also, the liquidus temperature of glass reduces, so as to complete the present invention.Specifically, the present invention carries For following scheme:

(1) a kind of optical glass, relative to the glass gross mass formed to be converted with oxide, in terms of quality %, contains 1.0~30.0% B2O3Component and 10.0~55.0% La2O3Component, and Ta2O5The content of component is less than 20.0%.

(2) optical glass according to (1) item, in being formed what is converted with oxide, containing selected from by TiO2Into Divide, Nb2O5Component and WO3One or more of the group of component composition component.

(3) optical glass according to (2) item, relative to the glass gross mass formed to be converted with oxide, choosing Free TiO2Component, Nb2O5Component and WO3The sum of one or more of the group of component composition content of component is more than 0.5% And less than 40.0%.

(4) optical glass according to (2) item or (3) item, relative to the glass formed to be converted with oxide Gross mass, in terms of quality %, contains:

0~20.0% TiO2Component, and/or

0~20.0% Nb2O5Component, and/or

0~25.0% WO3Component.

(5) optical glass according to any one of the item of (1)~(4), relative to forming of being converted with oxide Glass gross mass, in terms of quality %, also containing following each component:

0~20.0% SiO2Component, and/or

0~12.0% ZrO2Component.

(6) optical glass according to any one of the item of (1)~(5), relative to forming of being converted with oxide Glass gross mass, B2O3Component and SiO2The sum of content of component is less than 25.0%.

(7) optical glass according to any one of the item of (1)~(6), the mass ratio formed to be converted with oxide (ZrO2+Ta2O5+Nb2O5)/(B2O3+SiO2) it is less than 2.00.

(8) optical glass according to any one of the item of (1)~(7), relative to forming of being converted with oxide Glass gross mass, in terms of quality %, also containing following each component:

0~45.0% Gd2O3Component, and/or

0~30.0% Y2O3Component, and/or

0~20.0% Yb2O3Component.

(9) optical glass according to any one of the item of (1)~(8), relative to forming of being converted with oxide Glass gross mass, Ln2O3The quality of component and for more than 30.0% and less than 75.0%, in formula, Ln is selected from by La, Gd, Y, Yb One or more of group of composition element.

(10) optical glass according to (9) item, relative to the glass gross mass formed to be converted with oxide, Ln2O3The quality of component and more than 40.0%, in formula, Ln is selected from one or more of the group being made of La, Gd, Y, Yb element.

(11) optical glass according to any one of the item of (1)~(10), the quality formed to be converted with oxide Compare Ta2O5/(Ln2O3+ZrO2+Nb2O5+WO3) it is less than 0.300, in formula, Ln is in the group being made of La, Gd, Y, Yb More than one elements.

(12) optical glass according to any one of the item of (1)~(11), forms relative to what is converted with oxide Glass gross mass, in terms of quality %, also containing following each component:

0~20.0% MgO components, and/or

0~20.0% CaO components, and/or

0~20.0% SrO components, and/or

0~25.0% BaO components.

(13) optical glass according to (12) item, relative to the glass gross mass formed to be converted with oxide, The quality of RO components and for less than 25.0%, in formula, R is selected from one or more of the group being made of Mg, Ca, Sr, Ba element.

(14) optical glass according to any one of the item of (1)~(13), forms relative to what is converted with oxide Glass gross mass, in terms of quality %, also containing following each component:

0~10.0% Li2O components, and/or

0~10.0% Na2O components, and/or

0~10.0% K2O components, and/or

0~10.0% Cs2O components.

(15) optical glass according to (14) item, relative to the glass gross mass formed to be converted with oxide, Rn2The quality of O components and for less than 15.0%, in formula, Rn is selected from one or more of the group being made of Li, Na, K, Cs member Element.

(16) optical glass according to any one of the item of (1)~(15), the quality formed to be converted with oxide Than (B2O3+SiO2+WO3)/(Ln2O3+ZrO2+Li2O it is) more than 0.20 and less than 2.00.

(17) optical glass according to any one of the item of (1)~(16), forms relative to what is converted with oxide Glass gross mass, in terms of quality %, also containing following each component:

0~10.0% P2O5Component, and/or

0~10.0% GeO2Component, and/or

0~25.0% ZnO component, and/or

0~10.0% Al2O3Component, and/or

0~10.0% Ga2O3Component, and/or

0~20.0% Bi2O3Component, and/or

0~20.0% TeO2Component, and/or

0~1.0% SnO2Component, and/or

0~1.0% Sb2O3Component.

(18) optical glass according to any one of the item of (1)~(17), it has more than 1.75 refractive index (nd) and with more than 30 and less than 50 Abbe number (νd)。

(19) optical glass according to any one of the item of (1)~(18), it has less than 1300 DEG C of liquidus curve Temperature.

(20) a kind of optical element, it is using the optical glass any one of the item of (1)~(19) as mother metal.

(21) a kind of optical instrument, it possesses the optical element described in (20) item.

The effect of invention

According to the present invention, by containing B2O3Component and La2O3The glass of component reduces Ta2O5The content of component, With desired refractive index and while Abbe number, glass transition point is reduced, also, the material cost of glass is able to Reduce.Therefore, refractive index (n can more inexpensively be obtainedd) and Abbe number (νd) in desired scope and devitrification resistance High optical glass.

Embodiment

In the optical glass of the present invention, relative to the glass gross mass formed to be converted with oxide, in terms of quality %, contain There is 1.0~30.0% B2O3Component and 10.0~50.0% La2O3Component, and Ta2O5The content of component is less than 20.0%. By reducing Ta2O5The content of component is expensive and need the Ta melted at high temperature2O5The dosage of component is reduced, therefore optics glass The cost of material and manufacture cost of glass are minimized.At the same time, by with B2O3Component and La2O3Component is basis, With more than 1.80 refractive index (nd) and more than 35 and less than 50 Abbe number (νd) while, it is also easy to reduce liquidus curve Temperature.Therefore, refractive index (n can more inexpensively be obtainedd) and Abbe number (νd) in desired scope and devitrification resistance High optical glass, and use its optical element.

Hereinafter, the embodiment for the optical glass that the present invention will be described in detail.The present invention and appointing from implementation below What is limited, and can be subject to suitably to change to implement in the range of the object of the invention.In addition, in the place that explanation repeats sometimes Suitably omit the description, but not the main idea of invention is defined.

Glass ingredient

The compositing range for forming each component of the optical glass of the present invention is as described below.In the present specification, in no spy Do not mentionlet alone it is bright in the case of, the content of each component is all with the quality % relative to the glass gross mass formed to be converted with oxide To represent.Here, refer to " with forming for oxide conversion ":Assuming that making as the raw material of the glass constituent of the present invention Oxide, double salt, metal fluoride when melting when whole decomposition and inversion be oxide in the case of, with the oxygen of the generation The gross mass of compound for 100 mass % come each component contained in the glass that represents when composition.

On essential component, any condition

In the optical glass of the invention comprising a large amount of rare-earth oxides, B2O3Component is as the oxygen for forming glass Compound and indispensable essential component.Especially by making B2O3The content of component is more than 1.0%, can improve glass Devitrification resistance and the dispersion for reducing glass.Accordingly, with respect to the glass gross mass formed to be converted with oxide, B2O3Component Content lower limit is preferably 1.0%, more preferably 5.0%, more preferably 8.5%, most preferably 10.0%.On the other hand, By making B2O3The content of component is less than 30.0%, may be easy to obtain the refractive index of bigger, suppresses chemical durability and is deteriorated. Accordingly, with respect to the glass gross mass formed to be converted with oxide, B2O3The upper content limit of component is preferably 30.0%, more excellent Elect 20.0%, more preferably 18.0%, most preferably 15.0% as.Such as H can be used3BO3、Na2B4O7、Na2B4O7· 10H2O、BPO4Deng making to contain B in glass as raw material2O3Component.

La2O3Component is to improve the refractive index of glass and reduce the dispersion of glass so as to increase the component of Abbe number.Especially It is by making La2O3The content of component is more than 10.0%, can improve the refractive index of glass.Changed accordingly, with respect to oxide The glass gross mass of the composition of calculation, La2O3The content lower limit of component is preferably 10.0%, is more preferably 20.0%, further preferably For 25.0%, most preferably 30.0%.On the other hand, by making La2O3The content of component is less than 55.0%, more preferably Less than 50.0%, the stability of glass can be improved and reduce the devitrification of glass.Formed accordingly, with respect to what is converted with oxide Glass gross mass, La2O3The upper content limit of component is preferably 55.0%, is more preferably 50.0%, more preferably 49.0%th, it is most preferably 48.0%.Such as La can be used2O3、La(NO3)3·XH2O (X is arbitrary integer) etc. is used as raw material And make to contain La in glass2O3Component.

Ta2O5Component is to improve the refractive index of glass and improve devitrification resistance by reducing the liquidus temperature of glass Component, it is any condition in the optical glass of the present invention.Especially by making Ta2O5The content of component is less than 20.0%, The Ta of costliness can be reduced2O5The content of component, therefore can have desired optical constant with less expensive material cost production Optical glass.On the other hand, Ta2O5When the content of component is more than 20.0%, it can be difficult to obtain stable glass.Therefore, relatively In the glass gross mass formed to be converted with oxide, Ta2O5The upper content limit of component is preferably 20.0%, is more preferably less than 17.5%th, it is more preferably 13.9%.Herein, especially by making Ta2O5The content of component is less than 9.5%, can be dropped The temperature of eutectic solution raw material, so as to reduce the energy needed for dissolving raw material, therefore can also reduce the manufacture cost of optical glass. Therefore, from this viewpoint, relative to the glass gross mass formed to be converted with oxide, Ta2O5The upper content limit of component is preferred For 9.5%, more preferably 7.0%, most preferably 5.0%.On the other hand, Ta2O5When the content of component is more than 9.5%, it can press down The coloring of glass processed simultaneously improves the refractive index of glass and can improve the devitrification resistance of glass.Therefore, from this viewpoint, phase For the glass gross mass formed to be converted with oxide, Ta2O5The content lower limit of component is preferably greater than 9.5%, is more preferably 11.0%th, it is more preferably 12.8%.Such as Ta can be used2O5Deng making to contain Ta in glass as raw material2O5Component.

In the optical glass of the present invention, preferably comprise selected from by TiO2Component, WO3Component and Nb2O5Component composition One or more of group component.Thus, even if reducing Ta to reduce the material cost of glass2O5The content of component, can also Improve the refractive index of glass and the devitrification resistance of glass can be improved.Accordingly, with respect to the glass formed to be converted with oxide Glass gross mass, selected from by TiO2Component, Nb2O5Component and WO3The sum of one or more of the group of component composition content of component Lower limit be preferably greater than 0%, more preferably 0.5%, be most preferably 1.0%.On the other hand, by making them and be Less than 40.0%, it is possible to reduce coloring caused by these components and can suppress due to it is excessive containing these components and Caused devitrification resistance is deteriorated.Accordingly, with respect to the glass gross mass formed to be converted with oxide, selected from by TiO2Component, Nb2O5Component and WO3The upper limit of the sum of one or more of the group content of component of component composition is preferably 40.0%, more excellent Elect 30.0%, more preferably 20.0%, most preferably 8.0% as.

TiO2Component is the refractive index and Abbe number, the component for improving devitrification resistance for adjusting glass, is the optics of the present invention Any condition in glass.But TiO2Devitrification resistance can be deteriorated on the contrary when excessive, be grown in visible short under (below 500nm) The transmissivity of glass can also be deteriorated.Accordingly, with respect to the glass gross mass formed to be converted with oxide, TiO2The content of component The upper limit is preferably 20.0%, more preferably 10.0%, more preferably 8.0%, most preferably 5.0%.It can use for example TiO2Deng making to contain TiO in glass as raw material2Component.

Nb2O5Component is the component for improving glass refraction and dispersion, be the present invention optical glass in it is any into Point.Especially by making Nb2O5The content of component is less than 20.0%, can suppress to contain Nb due to excessive2O5Component and cause Glass devitrification resistance be deteriorated, and suppress glass and the transmissivity of visible ray declined.Therefore, relative to being converted with oxide The glass gross mass of composition, Nb2O5The upper content limit of component is preferably 20.0%, is more preferably 15.0%, is most preferably 12.0%.Such as Nb can be used2O5Deng making to contain Nb in glass as raw material2O5Component.

WO3Component be improve glass refractive index and dispersion, improve glass devitrification resistance component.Especially by making WO3The content of component is less than 25.0%, is more preferably less than 20.0%, can reduce the coloring of glass, can particularly make The transmissivity in visible-short wavelength region (being less than 500nm) is difficult to decline.Accordingly, with respect to forming of being converted with oxide Glass gross mass, WO3The upper content limit of component is preferably 25.0%, is more preferably 20.0%, is more preferably 15.0%, most Preferably 12.0%.In addition, even if the optical glass of the present invention does not contain WO3Component can also be obtained with desired optics The glass of constant and devitrification resistance, but by containing WO3Component, the liquidus temperature of glass can be reduced further, therefore can be with Further improve the devitrification resistance of glass.Accordingly, with respect to the glass gross mass formed to be converted with oxide, WO3Component Content lower limit is preferably greater than 0%, more preferably 0.1%, most preferably 1.0%.Such as WO can be used3Deng as raw material Make to contain WO in glass3Component.

SiO2Component is to improve the viscosity of melten glass, promote stabilization to be formed, reduced for optical glass not The component of preferable devitrification (crystal precipitation), is any condition in optical glass of the invention.Especially by making SiO2Into The content divided is less than 20.0%, can suppress the rising of glass transition point (Tg), and can suppress the reduction of refractive index. Accordingly, with respect to the glass gross mass formed to be converted with oxide, SiO2The upper content limit of component is preferably 20.0%, more excellent Elect 15.0% as, be most preferably 10.0%.Although in addition, even if SiO is not contained2Component will not be in generation technology negative shadow Ring, still, by containing SiO2Component, the liquidus temperature of glass can reduce, therefore glass can be made to be more difficult to devitrification.Therefore, Relative to the glass gross mass formed to be converted with oxide, SiO2The content lower limit of component is preferably 0.1%, is more preferably 1.0%th, it is more preferably 2.0%.Even if particularly from containing TiO2Component, WO3Component can also make glass be difficult to what is coloured Viewpoint is set out, SiO2The content of component is most preferably more than 4.0%.Such as SiO can be used2、K2SiF6、Na2SiF6Deng conduct Raw material and make to contain SiO in glass2Component.

ZrO2Component contributes to the high index of refraction of glass and the component of low dispersion, is appointing in optical glass of the invention Meaning component.But if ZrO2Amount cross and at most devitrification resistance can be made to be deteriorated on the contrary.Accordingly, with respect to the group to be converted with oxide Into glass gross mass, ZrO2The upper content limit of component is preferably 12.0%, more preferably 10.0%, most preferably 8.0%.This Outside, although even if not containing ZrO2Component can also obtain desired glass, still, by containing ZrO2Component, can be easy The performance of high-refractivity and low-dispersion is obtained, and is readily available the effect for improving devitrification resistance.Changed accordingly, with respect to oxide The glass gross mass of the composition of calculation, ZrO2The content lower limit of component is preferably greater than 0%, is more preferably 0.5%, is most preferably 1.0%.Such as ZrO can be used2、ZrF4Deng making to contain ZrO in glass as raw material2Component.

In the optical glass of the present invention, B2O3Component and SiO2The quality of component and preferably less than 25.0%, more preferably For less than 23.0%.Thus, it is possible to suppress due to containing B2O3Component and SiO2The decline of refractive index caused by component, can To be readily available desired high index of refraction.Accordingly, with respect to the glass gross mass formed to be converted with oxide, B2O3Component And SiO2The upper limit of the quality sum of component is preferably 25.0%, more preferably 23.0%, more preferably 21.0%, optimal Choosing is less than 20.0%.

In addition, in the optical glass of the present invention, quality and (ZrO2+Ta2O5+Nb2O5) and quality and (B2O3+SiO2) ratio Rate is preferably less than 2.00.Thus, the high ZrO of material cost can be reduced2Component, Ta2O5Component and Nb2O5The content of component, Therefore the optical glass with desired low liquidus temperature can be made with less expensive price.Therefore, changed with oxide Mass ratio (the ZrO of the composition of calculation2+Ta2O5+Nb2O5)/(B2O3+SiO2) the upper limit be preferably 2.00, more preferably 1.80, it is optimal Elect 1.50 as.

Gd2O3Component is to improve the refractive index of glass and improve the component of Abbe number, is in optical glass of the invention Any condition.Especially by making Gd2O3The content of component is less than 45.0%, is more preferably less than 40.0%, is becoming to hold While easily obtaining glass desired optical constant, it can suppress to contain Gd due to excessive2O3Vitrifying turns caused by component The rising of height (Tg), the devitrification resistance that glass can be improved.In addition, by reducing Gd2O3Component, can reduce optical glass Material cost.Accordingly, with respect to the glass gross mass formed to be converted with oxide, Gd2O3The upper content limit of component is preferably 45.0%th, it is more preferably 40.0%, more preferably 30.0%, most preferably 25.0%.Although in addition, even if do not contain Gd2O3Component there will not be technical negative effect, but by containing the Gd more than 0%2O3Component, by reducing glass Liquidus temperature can further improve devitrification resistance.Accordingly, with respect to the glass gross mass formed to be converted with oxide, Gd2O3The content lower limit of component is preferably greater than 0%, more preferably 1.0%, more preferably 2.0%.Herein, from can be with From the viewpoint of being readily available desired optical constant by improving refractive index and the Abbe number of glass, relative to oxygen The glass gross mass of the composition of compound conversion, Gd2O3The content lower limit of component is preferably greater than 5.0%, is more preferably 5.5%, most Preferably 6.0%.In addition, from the viewpoint of the devitrification resistance that can further improve glass, Gd2O3The content and La of component2O3 Ratio (the Gd of the content of component2O3/La2O3) be preferably more than 0.01 and less than 2.00, more preferably more than 0.03 and 1.70 with Under, be most preferably more than 0.05 and less than 1.50.Such as Gd can be used2O3、GdF3Make to contain in glass Deng as raw material Gd2O3Component.

Y2O3Component and Yb2O3Component is the refractive index for improving glass, the component for reducing dispersion, is the optics glass of the present invention Any condition in glass.Especially by making Y2O3The content of component is less than 30.0%, and/or makes Yb2O3The content of component is Less than 20.0%, the desired optical constant of glass can be readily available, and the devitrification resistance of glass can be improved.Therefore, Relative to the glass gross mass formed to be converted with oxide, Y2O3The upper content limit of component is respectively preferably 30.0%, more preferably For 25.0%, more preferably 20.0%, most preferably 15.0%.Accordingly, with respect to the glass formed to be converted with oxide Glass gross mass, Yb2O3The upper content limit of component is respectively preferably 20.0%, more preferably 15.0%, most preferably 10.0%.Can To use such as Y2O3、YF3、Yb2O3Deng making to contain Y in glass as raw material2O3Component and Yb2O3Component.

In the optical glass of the present invention, Ln2O3(in formula, Ln is one kind in the group being made of La, Gd, Y, Yb to component Above element) quality and preferably more than 30.0% and less than 75.0%, more preferably more than 30.0% and less than 70.0%. Especially by making Ln2O3The quality of component and for more than 30.0%, the refractive index and Abbe number of glass can be improved, because This, can be readily available the glass with desired refractive index and Abbe number.Accordingly, with respect to the group to be converted with oxide Into glass gross mass, Ln2O3The lower limit of the quality sum of component is preferably 30.0%, is more preferably 33.0%, more preferably More than 40.0%, most preferably more than 55.0%.On the other hand, by making Ln2O3The quality of component and for less than 75.0%, glass The liquidus temperature of glass can reduce, therefore can reduce the devitrification of glass.Accordingly, with respect to the glass formed to be converted with oxide Glass gross mass, Ln2O3The upper limit of the quality sum of component is preferably 75.0%, is more preferably 70.0%, more preferably 65.0%th, it is more preferably 60.0%, is most preferably 55.0%.

In the optical glass of the present invention, Ta2O5The content of component and quality and (Ln2O3+ZrO2+Nb2O5+WO3) ratio it is excellent Elect less than 0.300 as.Thus, the Ta that material cost is higher in the component for improving refractive index can be reduced2O5The content of component, because This, can make the optical glass with high index of refraction with lower cost.Accordingly, with respect to forming of being converted with oxide Glass gross mass, mass ratio Ta2O5/(Ln2O3+ZrO2+Nb2O5+WO3) the upper limit be preferably 0.300, more preferably 0.280, most Preferably 0.250.

MgO components, CaO components, SrO components and BaO components are refractive index, meltbility, the increased devitrification resistance for adjusting glass Component, is any condition in optical glass of the invention.Especially by making, MgO components, CaO components and SrO components are each From content be 20.0%, and/or make the contents of BaO components be less than 25.0%, pass through refraction caused by suppressing these components The reduction of rate can be readily available desired refractive index and can reduce because excessive occur containing these components The devitrification of glass.Accordingly, with respect to the glass gross mass formed to be converted with oxide, MgO components, CaO components and SrO into It is preferably 20.0%, more preferably 10.0%, most preferably 5.0% to divide respective upper content limit.In addition, relative to oxide The glass gross mass of the composition of conversion, the upper content limit of BaO components are preferably 25.0%, are more preferably 15.0%, are most preferably 10.0%.Such as MgCO can be used3、MgF2、CaCO3、CaF2、Sr(NO3)2、SrF2、BaCO3、Ba(NO3)2、BaF2Deng conduct Raw material and make to contain MgO components, CaO components, SrO components and BaO components in glass.

(in formula, R is one kind in the group being made of Mg, Ca, Sr, Ba to RO components in the optical glass of the present invention Above element) total content be preferably less than 25.0%.Thus, by suppressing the decline of the refractive index as caused by RO components, Desired refractive index can be readily available.Accordingly, with respect to the glass gross mass formed to be converted with oxide, RO components Quality sum the upper limit be preferably 25.0%, more preferably 15.0%, further preferably less than 12.0%, most preferably less than 10.0%.

Li2O components, Na2O components, K2O components and Cs2O components are to improve the meltbility of glass, reduce glass transition The component of point, is any condition in optical glass of the invention.Na among this2O components, K2O components and Cs2O components are also It is the component for improving glass devitrification resistance.Especially by making Li2O components, Na2O components, K2O components and Cs2O components are each Content be less than 10.0%, the refractive index of glass can be made to be difficult to decline and the stability of glass and reduction can be improved The generation of devitrification etc..Accordingly, with respect to the glass gross mass formed to be converted with oxide, Li2O components, Na2O components, K2O into Point and Cs2The respective upper content limit of O components is preferably 10.0%, more preferably 8.0%, most preferably 5.0%.It can use Such as Li2CO3、LiNO3、Li2CO3、NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6、Cs2CO3、CsNO3Deng Make to contain Li in glass as raw material2O components, Na2O components, K2O components and Cs2O components.

Rn2O components (in formula, Rn is selected from one or more of the group being made of Li, Na, K, Cs element) are to improve glass Meltbility and reduce the component of the devitrification of glass.Herein, by making Rn2Total content of O components is less than 15.0%, The refractive index of glass can be made to be difficult to the generation for reducing, the stability of glass being improved and reduce devitrification etc..Accordingly, with respect to The glass gross mass formed to be converted with oxide, Rn2The upper limit of the quality sum of O components is preferably 15.0%, is more preferably 10.0%th, it is most preferably 5.0%.

In the optical glass of the present invention, quality and (B2O3+SiO2+WO3) and quality and (Ln2O3+ZrO2+Li2O ratio) Preferably more than 0.20 and less than 2.00, it is more preferably more than 0.27 and less than 2.00.Especially by make the ratio be 0.27 More than, relative to the component (Ln for reducing devitrification resistance2O3Component, ZrO2Component and Li2O components) content, raising can be made Component (the B of devitrification resistance2O3Component, SiO2Component and WO3) content increase, therefore it is lower to obtain liquidus temperature And it is more difficult to the optical glass of devitrification.On the other hand, by making the ratio be less than 2.00, can be become prone in glass comprising work To improve the Ln of the component of refractive index and Abbe number2O3Component, therefore desired refractive index and Abbe can be readily available Number.Therefore, the mass ratio (B formed to be converted with oxide2O3+SiO2+WO3)/(Ln2O3+ZrO2+Li2O lower limit) is preferably 0.20th, it is more preferably 0.27, more preferably 0.28, most preferably 0.29.In addition, the upper limit of the mass ratio is preferably 2.00th, 1.50 are more preferably, is most preferably 1.00.

P2O5Component is with the liquidus temperature for reducing glass and improves the component of the effect of devitrification resistance, is the present invention Optical glass in any condition.Especially by making P2O5The content of component is less than 10.0%, can suppress the change of glass Learn the reduction of durability, particularly water resistance.Accordingly, with respect to the glass gross mass formed to be converted with oxide, P2O5Component Upper content limit be preferably 10.0%, more preferably 8.0%, be most preferably 5.0%.Such as Al (PO can be used3)3、Ca (PO3)2、Ba(PO3)2、BPO4、H3PO4Deng making to contain P in glass as raw material2O5Component.

GeO2Component is the refractive index with raising glass, improves the component of the effect of devitrification resistance, is the light of the present invention Learn any condition in glass.But due to GeO2Cost of material it is high, if therefore its amount can at most increase production cost, by This is offset by reducing Ta2O5Component and the effect obtained.Accordingly, with respect to the glass gross mass formed to be converted with oxide, GeO2The upper content limit of component is preferably 10.0%, more preferably 5.0%, most preferably 1.0%.Such as GeO can be used2Deng Make to contain GeO in glass as raw material2Component.

ZnO component is to reduce glass transition temperature (Tg), improve the component of chemical durability, is the optics glass of the present invention Any condition in glass.But at most the devitrification resistance of glass can be easily set to be deteriorated if the content of ZnO component is crossed.Therefore, relatively In the glass gross mass formed to be converted with oxide, the upper content limit of ZnO component is preferably 25.0%, is more preferably 20.0%th, it is more preferably 15.0%, is most preferably 10.0%.Although in addition, it can also be obtained even if ZnO component is not contained Glass with desired characteristic, but by the way that glass transition point can be reduced containing ZnO component, therefore, can be readily available It is easy to the optical glass being pressed.Accordingly, with respect to the glass gross mass formed to be converted with oxide, ZnO component Content lower limit be preferably greater than 0%, more preferably 0.1%, be most preferably 1.0%.Such as ZnO, ZnF can be used2Deng work Make to contain ZnO component in glass for raw material.

Al2O3Component and Ga2O3Component be improve glass chemical durability, improve melten glass devitrification resistance into Point, it is any condition in optical glass of the invention.Especially by making Al2O3Component and Ga2O3The respective content of component is Less than 10.0%, the tendency towards devitrification of glass can be weakened, improve the stability of glass.Accordingly, with respect to what is converted with oxide The glass gross mass of composition, Al2O3Component and Ga2O3The respective upper content limit of component is preferably 10.0%, more preferably 8.0%, Most preferably 5.0%.Such as Al can be used2O3、Al(OH)3、AlF3、Ga2O3、Ga(OH)3Make Deng as raw material in glass Contain Al2O3Component and Ga2O3Component.

Bi2O3Component is to improve refractive index, reduce the component of glass transition point (Tg), is in optical glass of the invention Any condition.Especially by making Bi2O3The content of component is less than 20.0%, can suppress the rising of liquidus temperature, because This can suppress the reduction of the devitrification resistance of glass.In addition, by making Bi2O3The content of component is less than 20.0%, it is possible to reduce glass The coloring of glass.Accordingly, with respect to the glass gross mass formed to be converted with oxide, Bi2O3The upper content limit of component is preferably 20.0%th, it is more preferably 15.0%, is most preferably 10.0%.Such as Bi can be used2O3Make to contain in glass Deng as raw material Bi2O3Component.

TeO2Component is to improve refractive index, reduce the component of glass transition point (Tg), is in optical glass of the invention Any condition.But former come melten glass by the fusion tank that platinum is formed with platinum crucible, the part contacted with melten glass During material, TeO2The problem of in the presence of with platinum alloy.Accordingly, with respect to the glass gross mass formed to be converted with oxide, TeO2Into The upper content limit divided is preferably 20.0%, more preferably 15.0%, most preferably 10.0%.Such as TeO can be used2Deng conduct Raw material and make to contain TeO in glass2Component.

SnO2Component is to reduce the oxidation for dissolving glass and make to dissolve glass clarifying, and the transmission for making glass irradiate light Rate is difficult to the component being deteriorated, and is any condition in optical glass of the invention.Especially by making SnO2The content of component is Less than 1.0%, can make by dissolve glass reduction caused by the coloring of glass, the devitrification of glass be difficult to produce.In addition, by In SnO2The alloying of component and dissolution equipment (the particularly noble metal such as Pt) is lowered, therefore can seek the length of dissolution equipment Service life.Accordingly, with respect to the glass gross mass formed to be converted with oxide, SnO2The upper content limit of component is respectively preferably 1.0%th, it is more preferably 0.7%, is most preferably 0.5%.Such as SnO, SnO can be used2、SnF2、SnF4Make Deng as raw material Contain SnO in glass2Component.

Sb2O3Component is by the component of melten glass deaeration, is any condition in optical glass of the invention.If Sb2O3 Measuring can at most make the transmissivity in the short wavelength region of visible region be deteriorated.Accordingly, with respect to the group to be converted with oxide Into glass gross mass, Sb2O3The upper content limit of component is preferably 1.0%, more preferably 0.7%, most preferably 0.5%.Can be with Use such as Sb2O3、Sb2O5、Na2H2Sb2O7·5H2O etc. makes to contain Sb in glass as raw material2O3Component.

In addition, make glass clarifying, the component of deaeration is not limited to above-mentioned Sb2O3Component, can use in glass manufacture Known fining agent, deaeration agent or they are applied in combination in field.

On the component that should not contain

Then, the component that should not contain in the optical glass of the present invention and the component not preferably comprised are said It is bright.

Other components can be added as needed in the range of the characteristic of glass of the present application is not damaged. But the various transition metal such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo in addition to Ti, Zr, Nb, W, La, Gd, Y, Yb, Lu Component have even in each can also make glass coloration in the form of independent or is compound and in the case of containing on a small quantity, to visible ray The specific wavelength in region produces the property absorbed, therefore particularly in the optical glass using the wavelength of visible region, it is excellent Choosing does not include these elements substantially.

Further, since the leaded such as PbO thing and As2O3It is the high component of environmental pressure Deng arsenide, it is therefore desirable that base Do not contained on this, i.e. remove and never contain these elements beyond being inevitably mixed into.

And then each component of Th, Cd, Tl, Os, Be and Se have in recent years as harmful chemical substance and controlling makes Tendency, is not only required for environmental cure in the processing in the manufacturing process of glass, after manufacturing procedure or even commercialization The measure of aspect.Therefore, in the case where paying attention to influence environmentally, preferably substantially free from there is these elements.

The composition of the glass composition of the present invention is with relative to the matter of the glass gross mass formed to be converted with oxide Amount % represents, because rather than directly represented with the recording mode of mole %, but with oxide convert composition to calculate, Meet that the composition of each component present in the glass composition of required various characteristics is represented with a mole % in the present invention, substantially For values below.

The B of 2.0~55.0 moles of %2O3Component and

The La of 5.0~35.0 moles of %2O3Component and

The Ta of 0~10.0 mole of %2O5Component and/or

The TiO of 0~30.0 mole of %2Component and/or

The Nb of 0~15.0 mole of %2O5Component and/or

The WO of 0~30.0 mole of %3Component and/or

The SiO of 0~50.0 mole of %2Component and/or

The ZrO of 0~18.0 mole of %2Component and/or

The Gd of 0~25.0 mole of %2O3Component and/or

The Y of 0~20.0 mole of %2O3Component and/or

The Yb of 0~10.0 mole of %2O3Component and/or

The MgO components of 0~50.0 mole of % and/or

The CaO components of 0~40.0 mole of % and/or

The SrO components of 0~30.0 mole of % and/or

The BaO components of 0~35.0 mole of % and/or

The Li of 0~30.0 mole of %2O components and/or

The Na of 0~25.0 mole of %2O components and/or

The K of 0~20.0 mole of %2O components and/or

The Cs of 0~10.0 mole of %2O components and/or

The P of 0~15.0 mole of %2O5Component and/or

The GeO of 0~10.0 mole of %2Component and/or

The ZnO component of 0~50.0 mole of % and/or

The Al of 0~15.0 mole of %2O3Component and/or

The Ga of 0~5.0 mole of %2O3Component and/or

The Bi of 0~10.0 mole of %2O3Component and/or

The TeO of 0~25.0 mole of %2Component and/or

0~0.5 mole of %Sb2O3Component

Manufacture method

The optical glass of the present invention can for example make as follows:That is, above-mentioned raw materials are uniformly mixed so that each component is providing Content range in, the mixture of making is put into platinum crucible, is existed according to the melting complexity that glass forms with electric furnace When melting 2~5 is small within the temperature range of 1100~1500 DEG C, after stirring homogenizes, it is reduced to proper temperature and is then cast in Mould, Slow cooling are made.

Physical property

The optical glass of the present invention is needed with high index of refraction (nd) and low dispersion.Optical glass particularly of the invention Refractive index (nd) lower limit be preferably 1.75, more preferably 1.80, more preferably 1.82, be most preferably 1.85.In addition, this Abbe number (the ν of the optical glass of inventiond) lower limit be preferably 30, more preferably 35, more preferably 37, be most preferably 39, its upper limit is preferably 50, more preferably 47, most preferably 45.Thus, the free degree of optical design is larger, even if further Larger optical diffraction amount can also be obtained by seeking the slimming of element.In addition, refractive index (the n of the optical glass of the present inventiond) The upper limit is mostly such as less than 2.00, is more specifically less than 1.98, is more specifically less than 1.95.

In addition, the optical glass of the present invention is even in Ta2O5Component it is poor in the case of be also required to high devitrification resistance. The optical glass of the present invention particularly preferably has less than 1300 DEG C of low liquidus temperature.More specifically, optics of the invention The upper limit of the liquidus temperature of glass is preferably 1300 DEG C, more preferably 1280 DEG C, is most preferably 1250 DEG C.Thus, even in Melten glass is flowed out under lower temperature, due to reducing the crystallization of made glass, can be improved by molten condition Devitrification resistance during glass is formed, the influence of the optical characteristics to the optical element using glass can be mitigated.Further, since open up It is wide to stablize the temperature range to form glass, therefore can also be molded glass even if the melting temperature for reducing glass, can To suppress the energy consumed during glass shaping.On the other hand, do not have to the lower limit of the liquidus temperature of the optical glass of the present invention It is particularly limited to, but more than the liquidus temperature of the glass obtained by the present invention more than substantially 500 DEG C, specifically 550 DEG C Above, it is more specifically more than 600 DEG C.In addition, so-called " liquidus temperature " in this specification represents:To capacity The cullet shape glass specimen of 30cc is put into the platinum crucible of 50ml, makes it in platinum crucible in completely molten at 1350 DEG C Melt state, when being cooled to set point of temperature and small holding 12, take out to outside stove, observe glass surface and glass immediately after the cooling period In whether there is crystal, and the minimum temperature unconfirmed to crystal.Here set point of temperature represent untill 1300 DEG C~1160 DEG C with 20 DEG C of temperature for unit setting.

In addition, the preferred coloring of the optical glass of the present invention is few.Particularly optical glass of the invention is with the transmissivity of glass During representing, the sample of thickness 10mm shows the wavelength (λ of 70% spectral-transmission favtor70) it is below 450nm, more preferably 430nm Below, it is most preferably below 400nm.In addition, wavelength (the λ of 5% spectral-transmission favtor of display5) be below 400nm, be more preferably Below 380nm, be most preferably below 360nm.Thus, the absorption edge of glass is located near ultraviolet region, can improve visible The transparency of glass in light region, therefore, materials'use that can be preferably using the optical glass as optical elements such as lens.

In addition, the optical glass of the present invention preferably has low partial dispersion ratio (θ g, F).More specifically, it is of the invention The partial dispersion ratio (θ g, F) of optical glass and Abbe number (νd) between meet (- 2.50 × 10-3×νd+ 0.6571)≤(θ g, F) ≦(-2.50×10-3×νd+ 0.6971) relation.Thus, it is possible to the small optical glass of partial dispersion ratio (θ g, F) is obtained, because This can reduce the chromatic aberation of the optical element formed by the optical glass.The present invention optical glass partial dispersion ratio (θ g, F lower limit) is preferably (- 2.50 × 10-3×νd+ 0.6571) (- 2.50 × 10, are more preferably-3×νd+ 0.6591), most preferably For (- 2.50 × 10-3×νd+0.6611).On the other hand, the upper limit of the partial dispersion ratio (θ g, F) of optical glass of the invention is excellent Elect (- 2.50 × 10 as-3×νd+ 0.6971) (- 2.50 × 10, are more preferably-3×νd+ 0.6921), be most preferably (- 2.50 × 10-3×νd+0.6871)。

Glass forming body and optical element

Can use such as attrition process method or, reheating is compressing, the side of compression molding precision press molding Method, glass forming body is made by the optical glass made.I.e., it is possible to the mechanical processing such as it is ground and is ground to optical glass Make glass forming body;Or can to carry out reheating to the preform that is made by optical glass compressing, then ground Mill is processed to make glass forming body;Or can be to being ground the preform processed and made, utilizing known float glass process The molding preform such as shaping carries out precision press molding, so as to make glass forming body.In addition, make glass forming body Method is not limited to these methods.

As described above, the glass forming body formed by the optical glass of the present invention is to various optical elements and optical design For be useful.Wherein particularly preferred for optical elements such as lens, prisms.Thus, the glass big since footpath can be formed Formed body, therefore optical element can be sought to maximize, and realize high-resolution when for camera, projecting apparatus when optical instrument And high-precision imaging characteristic and projection property.

Embodiment

By the embodiment of the present invention (No.1~No.285), reference example (No.A~No.B) and comparative example (No.A~ No.B composition and the refractive index (n of these glass)d), Abbe number (νd), partial dispersion ratio (θ g, F), liquidus temperature and Show the wavelength (λ of 5% and 70% spectral-transmission favtor5λ70) the results are shown in 1~table of table 38.In addition, following embodiment is only For the purpose of illustration, the present invention is not limited to these embodiments.

The embodiment of the present invention (No.1~No.285), reference example (No.A~No.B) and comparative example (No.A~No.B) In glass be to make as follows:As the raw material of each component, select respective oxide, hydroxide, carbonate, Nitrate, fluoride, metaphosphoric acid compound etc. are commonly used in the high-purity raw of optical glass, according to shown in 1~table of table 38 The proportion of composing of each embodiment carries out weighing, uniformly input platinum crucible, the melting complexity formed according to glass after mixing And with electric furnace within the temperature range of 1100~1500 DEG C melting 2~5 it is small when after, stirring homogenizes, and is then cast in mould Glass is made Deng, Slow cooling.

Here, according to Japanese Optical nitre industry meeting standard JOGIS01-2003, to embodiment (No.1~No.285), ginseng Examine the refractive index (n of the glass of example (No.A~No.B) and comparative example (No.A~No.B)d), Abbe number (νd) and part color Dissipate and be measured than (θ g, F).Then, according to obtained Abbe number (νd) and partial dispersion ratio (θ g, F) value, obtain Relational expression (θ g, F)=- a × νdIntercept b in+b when slope a is 0.0025.Here, refractive index (nd), Abbe number (νd), with And partial dispersion ratio (θ g, F) is to the cooling rate of Slow cooling being set as, glass obtained from -25 DEG C/hr is measured And obtain.

In addition, according to Japanese Optical nitre industry meeting standard JOGIS02, to embodiment (No.1~No.285), reference example The transmissivity of the glass of (No.A~No.B) and comparative example (No.A~No.B) is measured.In addition, in the present invention, pass through The transmissivity for measuring glass obtains the presence or absence of glass coloration and degree.Specifically, according to JISZ8722, to thickness 10 ± The parallel grinding object in opposite of 0.1mm measures the spectral-transmission favtor of 200~800nm, obtains λ5(transmissivity be 5% when wavelength) with And λ70(wavelength when transmissivity is 70%).

In addition, embodiment (No.1~No.285), reference example (No.A~No.B) and comparative example (No.A~No.B) The liquidus temperature of glass is obtained as follows:The glass specimen of 30cc cullet shapes is put into the platinum crucible of capacity 50ml, It is changed into molten condition completely in platinum crucible at 1350 DEG C, be cooled to untill 1300 DEG C~1160 DEG C in units of 20 DEG C When any temperature of setting and small holding 12, it is fetched into after being cooled down outside stove observe in glass surface and glass whether there is crystalline substance immediately Body, obtain the minimum temperature unconfirmed to crystal.

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

Table 13

Table 14

Table 15

Table 16

Table 17

Table 18

Table 19

Table 20

Table 21

Table 22

Table 23

Table 24

Table 25

Table 26

Table 27

Table 28

Table 29

Table 30

Table 31

Table 32

Table 33

Table 34

Table 35

Table 36

Table 37

Table 38

As shown in 1~table of table 38, the liquidus temperature of the optical glass in the embodiment of the present invention (No.1~No.285) It is less than 1300 DEG C, is more specifically less than 1260 DEG C, in desired scope.Hence it is evident that as can be seen that this hair The liquidus temperature of optical glass in bright embodiment is low.In addition, reference example (No.A~No.B) and comparative example (No.A~ No.B devitrification) occurs, therefore estimates its liquidus temperature height.

In addition, the λ of the optical glass in the embodiment of the present invention70(wavelength when transmissivity is 70%) be 420nm with Under, be more specifically below 405nm.In addition, the λ of the optical glass in the embodiment of the present invention5(when transmissivity is 5% Wavelength) it is below 400nm, is more specifically below 360nm.Hence it is evident that as can be seen that in the embodiment of the present invention Optical glass is difficult to colour.

In addition, refractive index (the n of the optical glass in the embodiment of the present inventiond) be more than 1.75, be more specifically More than 1.86, and the refractive index (nd) be less than 2.00, be more specifically less than 1.97, in desired scope.

In addition, Abbe number (the ν of the optical glass in the embodiment of the present inventiond) it is more than 30, and the Abbe number (νd) It is less than 50, is more specifically less than 42, in desired scope.

In addition, the partial dispersion ratio (θ g, F) of the optical glass in the embodiment of the present invention is (- 2.50 × 10-3×νd+ 0.6571) more than, more specifically be (- 2.50 × 10-3×νd+ 0.6665) more than.On the other hand, the embodiment of the present invention The partial dispersion ratio of optical glass is (- 2.50 × 10-3×νd+ 0.6971) it is below, more specifically (- 2.50 × 10-3×νd + 0.6813) below.Therefore, it is known that their partial dispersion ratio (θ g, F) is in desired scope.

Hence it is evident that the as can be seen that refractive index (n of the optical glass in the embodiment of the present inventiond) and Abbe number (νd) Desired scope is interior and can inexpensively make, devitrification resistance is high and it is few to colour.

And then glass blocks is formed using the optical glass in the embodiment of the present invention, which is ground and is ground Mill, so as to be processed as the shape of lens and prism.As a result, it can stably be processed as the shape of various lens and prism.

More than, the present invention is described in detail for the purpose of illustration, but the present embodiment is only for the purpose of illustration, It is appreciated that those skilled in the art can without departing from the spirit and scope of the present invention carry out many changes.

Claims (10)

1. a kind of optical glass, relative to the glass gross mass formed to be converted with oxide, in terms of quality %, containing 1.0~ 30.0% B2O3Component and 10.0~55.0% La2O3Component, and Ta2O5The content of component is less than 20.0%.
2. optical glass according to claim 1, in being formed what is converted with oxide, containing selected from by TiO2Component, Nb2O5Component and WO3One or more of the group of component composition component.
3. optical glass according to claim 1, relative to the glass gross mass formed to be converted with oxide, with matter % meters are measured, are contained:
0~20.0% TiO2Component, and/or
0~20.0% Nb2O5Component, and/or
0~25.0% WO3Component, and/or
0~20.0% SiO2Component, and/or
0~12.0% ZrO2Component, and/or
0~45.0% Gd2O3Component, and/or
0~30.0% Y2O3Component, and/or
0~20.0% Yb2O3Component, and/or
0~20.0% MgO components, and/or
0~20.0% CaO components, and/or
0~20.0% SrO components, and/or
0~25.0% BaO components, and/or
0~10.0% Li2O components, and/or
0~10.0% Na2O components, and/or
0~10.0% K2O components, and/or
0~10.0% Cs2O components, and/or
0~10.0% P2O5Component, and/or
0~10.0% GeO2Component, and/or
0~25.0% ZnO component, and/or
0~10.0% Al2O3Component, and/or
0~10.0% Ga2O3Component, and/or
0~20.0% Bi2O3Component, and/or
0~20.0% TeO2Component, and/or
0~1.0% SnO2Component, and/or
0~1.0% Sb2O3Component.
4. optical glass according to claim 1, relative to the glass gross mass formed to be converted with oxide, B2O3Into Point and SiO2The sum of content of component is less than 25.0%,
Relative to the glass gross mass formed to be converted with oxide, Ln2O3The quality of component and for more than 30.0% and 75.0% Hereinafter, in formula, Ln be selected from one or more of the group being made of La, Gd, Y, Yb element,
Relative to the glass gross mass formed to be converted with oxide, the quality of RO components and it is less than 25.0%, in formula, R is Selected from one or more of the group being made of Mg, Ca, Sr, Ba element,
Relative to the glass gross mass formed to be converted with oxide, Rn2The quality of O components and for less than 15.0%, in formula, Rn For selected from one or more of the group being made of Li, Na, K, Cs element.
5. optical glass according to claim 1, the mass ratio (ZrO formed to be converted with oxide2+Ta2O5+Nb2O5)/ (B2O3+SiO2) it is less than 2.00.
6. optical glass according to claim 1, the mass ratio Ta formed to be converted with oxide2O5/(Ln2O3+ZrO2+ Nb2O5+WO3) it is less than 0.300, in formula, Ln is selected from one or more of the group being made of La, Gd, Y, Yb element.
7. optical glass according to claim 1, the mass ratio (B formed to be converted with oxide2O3+SiO2+WO3)/ (Ln2O3+ZrO2+Li2O it is) more than 0.20 and less than 2.00.
8. optical glass according to claim 1, it has more than 1.75 refractive index (nd), have more than 30 and 50 with Under Abbe number (νd) and with less than 1300 DEG C of liquidus temperature.
9. a kind of optical element, it is using the optical glass described in any one of claim 1~8 as mother metal.
10. a kind of optical instrument, it possesses the optical element described in claim 9.
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