CN105906198A - Optical glass, prefabricated member and optical element - Google Patents

Optical glass, prefabricated member and optical element Download PDF

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Publication number
CN105906198A
CN105906198A CN201610090320.XA CN201610090320A CN105906198A CN 105906198 A CN105906198 A CN 105906198A CN 201610090320 A CN201610090320 A CN 201610090320A CN 105906198 A CN105906198 A CN 105906198A
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composition
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glass
optical glass
quality
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松石早矢
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Ohara Inc
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Ohara Inc
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Priority claimed from JP2015032195A external-priority patent/JP2016153355A/en
Priority claimed from JP2016007919A external-priority patent/JP6775874B2/en
Application filed by Ohara Inc filed Critical Ohara Inc
Priority to CN201911087187.2A priority Critical patent/CN110642512A/en
Publication of CN105906198A publication Critical patent/CN105906198A/en
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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
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • 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

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

Abstract

The invention aims to provide optical glass which has high refractivity, low chromatic dispersion and relatively high stability, a prefabricated member manufactured by the optical glass, and an optical element. The optical glass comprises the following components by mass relative to total mass of oxides: 8.0-40.0% of B2O3, 15.0-80.0% of Ln2O3, wherein Ln is more than one selected from a set which is composed of La, Gd, Y and Yb. Relative to the mass of the oxides except for an F component, the optical glass comprises 5.0-50.0% of the F component by mass. Furthermore the optical glass has refractivity (nd) in 1.20-1.80, and an Abbe number (nud) in 45-65.

Description

A kind of optical glass, prefabricated component and optical element
Technical field
The present invention relates to a kind of optical glass, prefabricated component and optical element.
Background technology
In recent years, the biometrics and high Qinghua using the equipment of optical system is developing rapidly, at digital camera and video camera Deng in the various optical instrument fields such as the video playback such as photographic goods, projecting apparatus and projection TV (projection) equipment, to subtracting The quantity of the optical elements such as few lens used in optical system and prism, and by overall optical system lightweight and little The requirement of type is more and more higher.
For manufacturing in the optical glass of optical element, particularly, to can realize overall optical system lightweight and Minimize has the high index of refraction (n of less than more than 1.50 1.80d) and high Abbe number (νd) the low look of high index of refraction The demand of the glass dissipated becomes the highest.About this point, the glass ingredient representated by patent document 1～3 is widely known by the people.
[patent document 1] Japanese Patent Laid-Open 2013-063888 publication
[patent document 2] Japanese Patent Laid-Open 2012-126586 publication
[patent document 3] Japanese documentation International Publication the 2010/090014th
Invent technical problem to be solved
But, in the glass described in patent document 1～3, have that Abbe number is less or the stability of glass is not enough Problem.It is therefore desirable to have less than more than 1.50 1.80 higher refractive index (nd) and higher (the low look of Abbe number Dissipate) optical glass.It addition, also require not only there is high index of refraction and low dispersion but also stable optical glass.
On the other hand, in chromatic aberation in the correction of the aberration (second order spectrum) of blue region, as in optical design The index of the optical characteristics got most of the attention, uses partial dispersion ratio (θ g, F).Partial dispersion ratio (θ g, F) by Below equation (1) represents.
θ g, F=(ng-nF)/(nF-nC)······(1)
Here, carry out in the optical system of chromatic aberration correction at convex lens and the concavees lens of high dispersion of the low dispersion of combination, The optical material that partial dispersion ratio (θ g, F) is bigger is used in the lens of low dispersion side, and in high dispersion side Lens use the optical material that partial dispersion ratio (θ g, F) is less, and by they are combined, permissible Correction second order spectrum.
But, the glass described in patent document 1～3, even if having high index of refraction and low dispersion, partial dispersion ratio is the most relatively Little, it is insufficient as correcting the lens of second order spectrum and using.I.e., it is desirable to not only there is higher refractive index (nd) and Higher Abbe number (νd) and the bigger optical glass of partial dispersion ratio (θ g, F).
The present invention completes in view of the above problems, its object is to provide one have high index of refraction and low dispersion and stablize Optical glass that property is higher and the prefabricated component made of it and optical element.
It addition, the present invention also aims to provide one have high index of refraction and low dispersion and chromatic aberation can be preferably used for The optical glass of correction and the prefabricated component made of it and optical element.
Summary of the invention
The present inventor, in order to solve above-mentioned problem, is repeated the result of deep test and research, at B2O3Composition and Ln2O3Composition (in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb) makes simultaneously Use F composition, and by adjusting the content of each composition, not only realize the high index of refraction of glass and low dispersion, and Find that the stability of glass is improved, thus complete the present invention.
It addition, the present inventor, at SiO2Composition, B2O3Composition, Ln2O3Composition (in formula, Ln be from by La, Gd, More than a kind selected in the group of Y and Yb composition) and BaO composition in use F composition simultaneously, and each by adjusting The content of individual composition, not only realizes the high index of refraction of glass and low dispersion, and also finds that the stability of glass is carried High.
Additionally, the present inventor, by adjusting the content of each composition, not only realize high index of refraction and low dispersion, and Also find that the partial dispersion ratio of glass is further enhanced.
Specifically, the present invention provides following optical glass.
(1) a kind of optical glass, it is characterised in that calculate, containing B with quality % of oxide benchmark2O3Composition 8.0～ 40.0%, Ln2O3Composition 15.0～80.0%, in formula, Ln is to select from the group being made up of La, Gd, Y and Yb More than a kind,
Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 50.0% F composition, there is refractive index n of less than more than 1.50 1.80dAnd the Abbe number ν of less than more than 45 65d。
(2) optical glass described in above-mentioned (1), it is characterised in that calculate, containing Ln with quality % of oxide benchmark2O3 Composition 25.0～80.0%, in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb, has Refractive index n of less than more than 1.65 1.80d。
(3) according to the optical glass described in above-mentioned (1) or (2), it is characterised in that in terms of quality % of oxide benchmark Calculate,
SiO2Composition is 0～20.0%,
BaO composition is 0～35.0%.
(4) according to the optical glass described in above-mentioned (1), it is characterised in that calculate with quality % of oxide benchmark, contain There is SiO2Composition 1.0～20.0%, B2O3Composition 10.0～40.0%, Ln2O3Composition 15.0～60.0% and BaO composition 5.0～55.0%, in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb,
Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 40.0% F composition,
There is refractive index n of less than more than 1.50 1.74dAnd the Abbe number ν of less than more than 45 65d。
(5) according to the optical glass described in any one of above-mentioned (1) to (4), it is characterised in that with oxide-base Accurate quality % calculates,
La2O3Composition is 0～60.0%,
Gd2O3Composition is 0～30.0%,
Y2O3Composition is 0～20.0%,
Yb2O3Composition is 0～20.0%,
TiO2Composition is 0～20.0%,
Nb2O5Composition is 0～20.0%,
WO3Composition is 0～15.0%,
Bi2O3Composition is 0～20.0%,
MgO composition is 0～10.0%,
CaO composition is 0～20.0%,
SrO composition is 0～25.0%,
Li2O composition is 0～10.0%,
Na2O composition is 0～10.0%,
K2O composition is 0～10.0%,
ZnO component is 0～20.0%,
P2O5Composition is 0～10.0%,
GeO2Composition is 0～10.0%,
Ta2O5Composition is 0～20.0%,
ZrO2Composition is 0～20.0%,
Al2O3Composition is 0～20.0%,
Ga2O3Composition is 0～20.0%,
TeO2Composition is 0～20.0%,
SnO2Composition is 0～5.0%, and
Sb2O3Composition is 0～1.0%.
(6) according to the optical glass described in any one of above-mentioned (1) to (5), it is characterised in that oxide benchmark Mass ratio F/Ln2O3It it is less than more than 0.05 1.00, here, Ln2O3The content of composition is with quality % of oxide benchmark The content calculated, the content of F composition is the quality relative to the oxide benchmark in addition to F composition, calculates with quality % Content.
(7) according to the optical glass described in any one of above-mentioned (1) to (6), it is characterised in that oxide benchmark Quality sum (SiO2+B2O3) it is less than more than 15.0% 50.0%.
(8) according to the optical glass described in any one of above-mentioned (1) to (7), it is characterised in that oxide benchmark Mass ratio (SiO2+B2O3)/F is less than more than 0.50 5.00, here, SiO2Composition and B2O3The content of composition, Being the content calculated with quality % of oxide benchmark, the content of F composition is relative to the oxide benchmark in addition to F composition Quality, with quality % calculate content.
(9) according to the optical glass described in any one of above-mentioned (1) to (8), it is characterised in that oxide benchmark Mass ratio Ln2O3/(SiO2+B2O3) it is more than 0.50, in formula, Ln is from the group being made up of La, Gd, Y and Yb More than a kind of middle selection.
(10) according to the optical glass described in any one of above-mentioned (1) to (9), it is characterised in that oxide benchmark Mass ratio (TiO2+Nb2O5+WO3+Bi2O3)/F is less than 0.50, here, TiO2Composition, Nb2O5Composition, WO3Composition and Bi2O3The content of composition is the content calculated with quality % of oxide benchmark, and the content of F composition is phase Quality for the oxide benchmark in addition to F composition, the content with the calculating of quality %.
(11) according to the optical glass described in any one of above-mentioned (1) to (10), it is characterised in that oxide-base The quality sum of accurate RO composition is less than 60.0%, and in formula, R is to select from the group being made up of Mg, Ca, Sr and Ba More than a kind selected.
(12) according to the optical glass described in any one of above-mentioned (1) to (11), it is characterised in that oxide-base Accurate mass ratio (BaO/RO) is more than 0.50, and in formula, R is to select from the group being made up of Mg, Ca, Sr and Ba More than a kind.
(13) according to the optical glass described in any one of above-mentioned (1) to (12), it is characterised in that oxide-base Accurate quality sum (Ln2O3+ BaO) be less than more than 30.0% 85.0%, in formula, Ln be from by La, Gd, Y and More than a kind selected in the group of Yb composition.
(14) according to the optical glass described in any one of above-mentioned (1) to (13), it is characterised in that oxide-base Accurate mass ratio (Ln2O3+BaO)/(SiO2+B2O3) be more than 1.00, in formula, Ln be from by La, Gd, Y and More than a kind selected in the group of Yb composition.
(15) according to the optical glass described in any one of above-mentioned (1) to (14), it is characterised in that oxide-base Accurate Rn2The quality sum of O composition is less than 10.0%, and in formula, Rn is to select from the group being made up of Li, Na and K More than a kind.
(16) according to the optical glass described in any one of above-mentioned (1) to (15), it is characterised in that oxide-base Accurate quality sum (Ta2O5+ZrO2+Al2O3) it is less than 20.0%.
(17) according to the optical glass described in any one of above-mentioned (1) to (16), it is characterised in that refractive index nd And Abbe number νdMeet (-0.01 νd+2.15)≦nd≦(-0.01νd+ 2.35) relation.
(18) a kind of optical element, it is characterised in that by the optics glass described in any one of above-mentioned (1) to (17) Glass is constituted.
(19) a kind of prefabricated component, it is characterised in that by the optical glass described in any one of above-mentioned (1) to (17) Constitute, and for polishing and/or precise punch forming.
(20) a kind of optical element, it is characterised in that the prefabricated component described in above-mentioned (19) is carried out precision stamping processing and Become.
Invention effect
According to the present invention it is possible to provide one to have high index of refraction and low dispersion, and the optical glass that stability is higher, And the prefabricated component that makes of it and optical element.
It addition, according to the present invention it is possible to provide one to have high index of refraction and low dispersion, and colour can be preferably used for The optical glass of difference correction, and the prefabricated component that makes of it and optical element.
Accompanying drawing explanation
Fig. 1 be with partial dispersion ratio (θ g, F) be y-axis, with Abbe number (νd) be x-axis rectangular coordinate system shown in Normal line schematic diagram.
Fig. 2 is the refractive index (n of the glass of the embodiment about the first optical glassd) and Abbe number (νd) relation show It is intended to.
Fig. 3 is the refractive index (n of the glass of the embodiment about the second optical glassd) and Abbe number (νd) relation show It is intended to.
Fig. 4 is partial dispersion ratio (θ g, F) and the Abbe number (ν of the glass of the embodiment about the first optical glassd) Relation schematic diagram.
Fig. 5 is partial dispersion ratio (θ g, F) and the Abbe number (ν of the glass of the embodiment about the second optical glassd) Relation schematic diagram.
Detailed description of the invention
The optical glass of the present invention, it calculates, containing B with quality % of oxide benchmark2O3Composition 8.0～40.0%, Ln2O3 Composition (in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb) 15.0～80.0%, Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 50.0% F composition, has the refractive index (n of less than more than 1.50 1.80d) and the Abbe number (ν of less than more than 45 65d)。
Wherein, the first optical glass, it calculates, containing B with quality % of oxide benchmark2O3Composition 8.0～40.0%, Ln2O3Composition (in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb) 25.0～80.0%, Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 50.0% F composition, has the refractive index (n of less than more than 1.65 1.80d) and the Abbe number (ν of less than more than 45 65d)。
It addition, the second optical glass, it calculates, containing SiO with quality % of oxide benchmark2Composition 1.0～20.0%, B2O3Composition 10.0～40.0%, Ln2O3Composition 15.0～60.0% (in formula, Ln is from by La, Gd, Y and Yb More than a kind selected in the group of composition) and BaO composition 5.0～55.0%, relative to the oxide-base in addition to F composition Accurate quality, calculates with quality %, containing the F composition of less than more than 5.0% 40.0%, have more than 1.50 1.74 with Under refractive index (nd) and the Abbe number (ν of less than more than 45 65d)。
At B2O3Composition and Ln2O3Composition uses F composition simultaneously, and by adjusting the content of each composition, not only The high index of refraction of glass and low dispersion can be realized, and also the stability of glass can be improved.Particularly, at the second light Learn in glass, at SiO2Composition, B2O3Composition, Ln2O3Composition and BaO composition use F composition simultaneously, and leads to Cross the content adjusting each composition, be possible not only to realize the high index of refraction of glass and low dispersion, and also glass can be improved Stability.It is, therefore, possible to provide one has high index of refraction and low dispersion, and the optical glass that stability is higher, And the prefabricated component that makes of it and optical element.
Additionally, by the content adjusting each composition, be possible not only to realize high index of refraction and low dispersion, and also can enter One step improves the partial dispersion ratio of glass.
It is, therefore, possible to provide one has high index of refraction and low dispersion, and the optics glass of chromatic aberration correction can be preferably used for Glass, and the prefabricated component that makes of it and optical element.
Hereinafter, the embodiment of the optical glass of the present invention is specifically described.The present invention is not appointed by implementation below What limits, and in the range of the purpose of the present invention, can suitably change and implement.Additionally, for the portion of repeat specification Point, the description thereof is omitted as appropriate sometimes, but does not limit the objective of invention.
[glass ingredient]
The compositing range of each composition constituting the optical glass of the present invention is as described below.In this manual, without especially Illustrating, the content of each composition all represents with quality % relative to the glass gross mass of oxide conversion composition.Here, " oxygen Compound conversion composition " refer to, hypothesis use as the raw material of glass constituent of the present invention oxide, complex salt, Metal fluorides etc. are in the case of when melted, whole decomposition and inversion become oxide, using the gross mass of this oxide as 100 Quality %, represents the composition of each composition contained in glass.
<about required composition, any composition>
B2O3Composition, is by making it contain more than 8.0%, forms network structure at inside glass, can promote to be formed surely Fixed glass also improves devitrification resistance, and can improve the required composition of Abbe number.Therefore, B2O3The content of composition, Desirably with 8.0% as lower limit, more preferably with 10.0% as lower limit, under more preferably with 11.0% being Limit, more preferably with 13.0% as lower limit, more preferably with 14.0% as lower limit, more preferably with 16.0% For lower limit.
On the other hand, by making B2O3The content of composition, below 40.0%, can suppress the reduction of refractive index, and can To suppress the reduction of chemical durability.Therefore, B2O3The content of composition, it is usually desirable to 40.0% as the upper limit, more Ideally with 33.0% as the upper limit, more preferably with 28.0% as the upper limit, more preferably with 24.0% for upper Limit, is more preferably less than 22.0%, more preferably less than 21.0%, is more preferably less than 20.0%.
B2O3Composition, can use H as raw material3BO3、Na2B4O7、Na2B4O7·10H2O、BPO4Deng.
Ln2O3Composition (in formula, Ln be from the group being made up of La, Gd, Y, Yb select more than a kind) content it (quality sum) is 15.0～80.0%.
Particularly, by making this quality sum more than 15.0%, refractive index and the Abbe number of glass can be improved, therefore The glass of high-refractivity and low-dispersion can be obtained relatively easily.It addition, coloring can be reduced accordingly.Therefore, Ln2O3Composition The quality sum of content, it is usually desirable to 15.0% as lower limit, more preferably with 17.0% as lower limit, more It is preferably with 21.0% as lower limit, more preferably with 25.0% as lower limit, more preferably with 26.0% as lower limit, More preferably with 31.0% as lower limit, more preferably with 34.0% as lower limit, more preferably with 36.0% it is Lower limit, more preferably with 39.0% as lower limit.Particularly, in the first optical glass, Ln2O3The content of composition Quality sum, can be with 42.0% as lower limit, more preferably can also be with 46.0% as lower limit.
On the other hand, by making this quality sum below 80.0%, devitrification resistance can be improved.Therefore, Ln2O3Composition The quality sum of content, it is usually desirable to less than 80.0%, be more preferably less than 78.0%, more preferably Less than 75.0%, more preferably it is less than 72.0%.Particularly, in the second optical glass, Ln2O3The content of composition Quality sum, it is usually desirable to less than 60.0%, be more preferably less than 55.0%, be more preferably less than 53.0%, more preferably it is less than 50.0%, more preferably can also be less than 48.5%.
F composition, is by making it contain more than 5.0%, can improve the partial dispersion ratio of glass, and reduce vitrifying The required composition of transition temperature.Particularly, by making it contain F composition, can obtain that there is higher partial dispersion ratio, And colour less optical glass.Therefore, the content of F composition, it is usually desirable to more than 5.0%, more preferably More than 5.5%, more preferably more than 6.0%, be more preferably greater than 6.0%, more preferably 6.5% with On, more preferably it is greater than 7.0%, more preferably more than 8.0%.It addition, particularly in the first optical glass, The content of F composition, may be greater than 10.0%, it is also possible to be more than 10.6%.
On the other hand, by making F component content below 50.0%, the rising of specific gravity of glass can be suppressed, and can make Glass is difficult to devitrification.Therefore, the content of F composition, it is usually desirable to 50.0% as the upper limit, more preferably with 45.0% For the upper limit, more preferably with 40.0% as the upper limit, more preferably with 35.0% as the upper limit, more preferably with 30.0% is the upper limit, more preferably with 29.0% as the upper limit, more preferably with 24.0% as the upper limit, even more ideal Be with 20.0% as the upper limit, more preferably with 17.0% as the upper limit, more preferably with 12.0% as the upper limit, more Add and be preferably with 11.0% as the upper limit.
F composition, can use ZrF as raw material4、AlF3、NaF、CaF2、LaF3Deng.
It addition, the content of the F composition in this specification is, assuming all cation constituents constituting glass and only balance The oxygen of power down lotus is combined into oxide, then is formed the optical glass of the present invention by this oxide, and with by these oxide institutes When the gross mass of the glass formed is as 100%, represent that the quality of F composition is (relative in addition to F composition with quality % The quality of oxide benchmark, with quality % calculate) content.
SiO2Composition is, when content is more than 0%, it is possible to reduce the coloring of glass, and can improve appointing of devitrification resistance Meaning composition.Particularly, in the second optical glass, be by making it contain more than 1.0%, can obtain these effect must Need composition.Therefore, SiO2The content of composition, it is usually desirable to more than 0%, is more preferably greater than 0.5%, more It is preferably more than 1.0%, is more preferably greater than 1.0%, more preferably more than 2.0%, the most greatly In 3.0%, more preferably can also be more than 4.0%.
On the other hand, by making SiO2The content of composition, below 20.0%, can make SiO2Composition is prone at molten state glass Glass melts, it is to avoid high-temperature fusion.SiO2The content of composition, it is usually desirable to less than 20.0% is the least In 17.0%, more preferably less than 15.0%, more preferably it is less than 13.0%, more preferably less than 12.0%, More preferably it is less than 11.0%, more preferably less than 10.0%, is more preferably less than 8.0%, more preferable Be less than 5.0%.
SiO2Composition, can use SiO as raw material2、K2SiF6、Na2SiF6Deng.
BaO composition is, when content is more than 0%, is possible not only to improve refractive index and the devitrification resistance of glass, and permissible Improve any composition of the meltbility of frit.Particularly, in the second optical glass, it is by making it contain 5.0% Above, the required composition of these effects can be obtained.Therefore, the content of BaO composition, it is usually desirable to more than 0%, more Ideally more than 1.5%, more preferably more than 2.5%, more preferably more than 5.0%, more preferably More than 5.0%, more preferably can also be more than 12.0%.Particularly, in the second optical glass, BaO composition Content, is more preferably greater than 16.0%, more preferably more than 20.0%, more preferably can also be more than 22.5%.
On the other hand, by making the content of BaO composition below 55.0%, the refractive index of glass can be made to be difficult to reduce, And the devitrification of glass can be reduced.Therefore, the content of BaO composition, it is usually desirable to less than 55.0%, even more ideal Be less than 45.0%, more preferably less than 40.0%, more preferably less than 35.0%, the least In 35.0%, more preferably it is less than 30.0%.Particularly, in the second optical glass, the content of BaO composition, can To be less than 25.0%, more preferably might be less that 20.0%.
BaO composition, can use BaCO as raw material3、Ba(NO3)2Deng.
La2O3Composition is, when content is more than 0%, can improve refractive index and the Abbe number of glass, and can carry Any composition of high visible light transmissivity.Therefore, La2O3The content of composition, it is usually desirable to more than 0%, more manage That thinks is greater than 1.0%, more preferably more than 5.0%, is more preferably greater than 10.0%, the most greatly In 17.0%, more preferably it is greater than 15.0%, more preferably more than 22.0%, is more preferably greater than 26.0%, More preferably can also be more than 28.0%.
On the other hand, by making La2O3The content of composition, below 60.0%, can make glass be difficult to devitrification, and permissible The increase of suppression specific gravity of glass.It addition, especially by reducing La2O3The content of composition, can suppress partial dispersion ratio Reduce.Therefore, La2O3The content of composition, it is usually desirable to less than 60.0%, is more preferably less than 55.0%, More preferably less than 52.0%, more preferably it is less than 50.0%, more preferably less than 45.0%, more manages Think is less than 40.0%, more preferably less than 38.0%, is more preferably less than 37.0%, more preferably Less than 35.0%.
La2O3Composition, can use La as raw material2O3、La(NO3)3·XH2O (X is arbitrary integer) etc..
Gd2O3Composition is, when content is more than 0%, can improve the refractive index of glass and any composition of Abbe number. Therefore, Gd2O3The content of composition, it is usually desirable to more than 0%, is more preferably greater than 1.0%, more preferably It is greater than 3.0%, more preferably can also be more than 5.0%.
On the other hand, by making Gd2O3The content of composition, below 30.0%, can suppress rising and the portion of specific gravity of glass Color separation dissipates the reduction of ratio, and also can suppress devitrification.Therefore, Gd2O3The content of composition, it is usually desirable to 30.0% Hereinafter, more preferably it is less than 25.0%, more preferably less than 23.0%, more preferably less than 20.0%, More preferably less than 20.0%, more preferably it is less than 17.0%, more preferably less than 15.0%, more manages Think is less than 13.0%, more preferably less than 10.0%, is more preferably less than 9.0%.
Gd2O3Composition, can use Gd as raw material2O3、GdF3Deng.
Y2O3Composition and Yb2O3Composition is, when at least any one content is more than 0%, can improve the folding of glass Penetrate any composition of rate and Abbe number.Particularly, Y2O3Composition, is also the composition that can reduce specific gravity of glass.Therefore, Y2O3The content of composition, it is usually desirable to more than 0%, is more preferably greater than 1.0%, is more preferably more than 3.0%, more preferably can also be more than 5.0%.
On the other hand, by making Y2O3Composition or Yb2O3The content of composition, below 20.0%, can improve the steady of glass Qualitative.It addition, especially by making Yb2O3The content of composition is below 20.0%, owing to glass is difficult to absorb longer ripple The light of long side (vicinity of wavelength 1000nm), can improve glass to ultrared patience.Therefore, Y2O3Become Divide and Yb2O3At least any one content in composition, it is usually desirable to less than 20.0%, is more preferably less than 15.0%, more preferably less than 12.0%, more preferably it is less than 10.0%.Particularly, Yb2O3The content of composition, Both can be less than 5.0%, it is also possible to less than 1.0%.
Y2O3Composition and Yb2O3Composition, can use Y as raw material2O3、YF3、Yb2O3Deng.
TiO2Composition, Nb2O5Composition and WO3Composition is, when at least any one content is more than 0%, and Ke Yiti The refractive index of high glass and any composition of partial dispersion ratio.
Particularly, TiO2Composition and Nb2O5Composition, still can reduce the composition of proportion.
On the other hand, by reducing TiO2Composition, Nb2O5Composition or WO3The content of composition, can suppress Abbe number Reduction, and the reduction of the light transmittance of the shorter wavelength (below 500nm) of visible ray can be suppressed.
Therefore, TiO2The content of composition, it is usually desirable to less than 20.0%, is more preferably less than 10.0%, more Ideally less than 5.0%, more preferably it is less than 3.0%.
It addition, Nb2O5The content of composition, it is usually desirable to less than 20.0%, more preferably less than 10.0%, more Add ideally less than 10.0%, be more preferably less than 5.0%, more preferably less than 3.0%, more preferably It is less than 1.0%.
It addition, WO3The content of composition, it is usually desirable to less than 15.0%, more preferably less than 10.0%, more Ideally less than 10.0%, more preferably it is less than 5.0%, more preferably less than 3.0%, more preferably Less than 1.0%.
TiO2Composition, Nb2O5Composition and WO3Composition, can use TiO as raw material2、Nb2O5、WO3Deng.
Bi2O3Composition is, when at least any one content is more than 0%, can improve refractive index and the part of glass Any composition of dispersion ratio.It addition, Bi2O3Composition, is also the composition that can reduce glass transition temperature.
On the other hand, by reducing Bi2O3The content of composition, can suppress the reduction of Abbe number, and also can suppress can See the reduction of the light transmittance of the shorter wavelength (below 500nm) of light.
Therefore, Bi2O3The content of composition, it is usually desirable to less than 20.0%, more preferably less than 10.0%, more Add ideally less than 10.0%, be more preferably less than 5.0%, more preferably less than 3.0%, more preferably It is less than 1.0%.
Bi2O3Composition, can use Bi as raw material2O3Deng.
MgO composition, CaO composition and SrO composition be, when at least any one content is more than 0%, can improve The meltbility of glass and improve any composition of devitrification resistance.Particularly, in the second optical glass, SrO composition, be also The composition of the refractive index of glass can be improved.
On the other hand, by reducing MgO composition, CaO composition or the content of SrO composition, it is possible to reduce the mistake of glass Thoroughly.Particularly, by reducing MgO composition or the content of CaO composition, the reduction of refractive index can be suppressed.It addition, Particularly in the first optical glass, by reducing the content of SrO composition, it is also possible to the reduction of suppression refractive index.
Therefore, the content of MgO composition, it is usually desirable to less than 10.0%, is more preferably less than 5.0%, more Ideally less than 3.0%, more preferably it is less than 1.0%.
It addition, the content of CaO composition, it is usually desirable to less than 20.0%, more preferably it is less than 17.0%, more It is preferably less than 10.0%, is more preferably less than 10.0%, more preferably less than 5.0%, more preferably Less than 3.0%, more preferably less than 1.0%.
It addition, the content of SrO composition, it is usually desirable to less than 25.0%, more preferably less than 18.0%, more Ideally less than 10.0%, more preferably it is less than 5.0%.
MgO composition, CaO composition and SrO composition, can use MgCO as raw material3、MgF2、CaCO3、 CaF2、Sr(NO3)2、SrF2Deng.
Li2O composition, Na2O composition and K2O composition is, when at least any one content is more than 0%, and Ke Yigai Any composition of the meltbility of kind glass.
Here, by making it contain Li2O composition, can form stable glass relatively easily.Therefore, particularly exist In second optical glass, make Li2The content of O composition, it is usually desirable to more than 0%, is more preferably greater than 1.0%, More preferably can also be larger than 1.5%.
It addition, K2O composition, is also the composition of the partial dispersion ratio that can further improve glass.
On the other hand, by reducing Li2O composition, Na2O composition or K2The content of O composition, can suppress glass The reduction of refractive index, and devitrification can be reduced.Particularly, by reducing Li2The content of O composition, can suppress glass The reduction of partial dispersion ratio.Therefore, Li2O composition, Na2O and K2At least any one content in O composition, than Preferably less than 10.0%, more preferably it is less than 6.0%, more preferably less than 5.0%, more preferably It is less than 4.0%, more preferably less than 3.0%.Particularly, in the second optical glass, Na2O and K2O becomes At least any one content in Fen, it is also possible to less than 1.0%.
Li2O composition, Na2O composition and K2O composition, can use Li as raw material2CO3、LiNO3、LiF、Na2CO3、 NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6Deng.
ZnO component is, when content is more than 0%, can improve the meltbility of glass, and can reduce glass transition Temperature, it is also possible to reduce any composition of devitrification.
On the other hand, by making the content of ZnO component below 20.0%, it is possible to reduce the reduction of refractive index and devitrification. It addition, the viscosity of molten glass can be improved accordingly, the generation of glass cord therefore can be reduced.Therefore, ZnO becomes Point content, it is usually desirable to less than 20.0%, more preferably less than 10.0%, more preferably less than 10.0%, More preferably 5.0% it is less than, more preferably less than 2.0%.
ZnO component, can use ZnO, ZnF as raw material2Deng.
P2O5Composition is, when content is more than 0%, can improve devitrification resistance by reducing the liquidus temperature of glass Arbitrarily composition.
On the other hand, by making P2O5The content of composition, below 10.0%, can suppress the fall of the chemical durability of glass Low, the particularly reduction of resistance to water.Therefore, P2O5The content of composition, it is usually desirable to less than 10.0%, even more ideal Be less than 5.0%, more preferably less than 3.0%, be more preferably less than 1.0%.
P2O5Composition, can use Al (PO as raw material3)3、Ca(PO3)2、Ba(PO3)2、BPO4、H3PO4 Deng.
GeO2Composition is, when content is more than 0%, can improve the refractive index of glass, and can improve devitrification resistance Arbitrarily composition.
On the other hand, due to GeO2The cost of material of composition is higher, if so its content is higher, causing material cost to raise, Therefore the practicality of obtained glass reduces.Therefore, GeO2The content of composition, it is usually desirable to less than 10.0%, more Ideally less than 5.0%, more preferably less than 3.0%, more preferably it is less than 1.0%.
GeO2Composition, can use GeO as raw material2Deng.
Ta2O5Composition is, when content is more than 0%, can improve the refractive index of glass and any composition of devitrification resistance.
On the other hand, by making Ta2O5The content of composition, below 10.0%, can suppress the fall of the partial dispersion ratio of glass Low.It addition, by reducing Ta costly2O5Composition can suppress the rising of the material cost of glass, and by avoiding High-temperature fusion can reduce the manufacturing cost of glass.Therefore, Ta2O5The content of composition, it is usually desirable to 20.0%, more Ideally 10.0%, more preferably less than 5.0%, more preferably it is less than 5.0%, the least In 3.0%, being more preferably less than 1.0%, ideal has been free from.
Ta2O5Composition, can use Ta as raw material2O5Deng.
ZrO2Composition is, when content is more than 0%, can improve the refractive index of glass and any composition of devitrification resistance.
On the other hand, by making ZrO2The content of composition, below 20.0%, can suppress the reduction of Abbe number, and also The reduction of partial dispersion ratio can be suppressed.Further, since the high-temperature fusion of frit can be avoided, therefore glass can be reduced Manufacturing cost.Therefore, ZrO2The content of composition, it is usually desirable to less than 20.0%, is more preferably less than 10.0%, More preferably it is less than 5.0%, is more preferably less than 3.0%, is more preferably less than 2.5%.
ZrO2Composition, can use ZrO as raw material2、ZrF4Deng.
Al2O3Composition and Ga2O3Composition is, when content is more than 0%, can form stable glass relatively easily Arbitrarily composition.
On the other hand, by making Al2O3Composition or Ga2O3The content of composition, below 20.0%, can suppress Abbe number Reduction.Therefore, Al2O3Composition and Ga2O3At least any one content in composition, it is usually desirable to 20.0% with Under, more preferably it is less than 10.0%, more preferably less than 5.0%, is more preferably less than 3.0%, more Ideally less than 1.0%, more preferably less than 0.6%.
Al2O3Composition and Ga2O3Composition, can use Al as raw material2O3、Al(OH)3、AlF3、Ga2O3、Ga (OH)3Deng.
TeO2Composition is, when content is more than 0%, can improve refractive index and reduce appointing of glass transition temperature (Tg) Meaning composition.
On the other hand, TeO2In the fusion tank that platinum crucible and the part that contacts with molten glass are formed by platinum During molten raw, existing can be with the problem of platinum alloy.Therefore, TeO2The content of composition, more satisfactory It is less than 20.0%, is more preferably less than 10.0%, more preferably less than 5.0%, is more preferably less than 3.0%.
TeO2Composition, can use TeO as raw material2Deng.
SnO2Composition is, when content is more than 0%, it is possible to reduce the oxidation of molten glass and make molten glass limpid, And the light transmittance that can make glass is difficult to any composition reduced.
On the other hand, by making SnO2The content of composition, below 5.0%, can make to be caused by the reduction of molten glass The coloring of glass and the devitrification of glass are difficult to occur.Further, since SnO can be reduced2Composition is with fusion apparatus (especially The noble metals such as Pt) alloying, therefore can realize the service life that fusion apparatus is longer.Therefore, SnO2Composition Content, it is usually desirable to less than 5.0%, is more preferably less than 3.0%, more preferably less than 1.0%, more Ideally less than 0.5%.
SnO2Composition, can use SnO, SnO as raw material2、SnF2、SnF4Deng.
Sb2O3Composition is, when content is more than 0%, can make any composition of molten glass deaeration.
On the other hand, by making Sb2O3The content of composition, below 1.0%, can make it be not likely to produce excessive foaming, And also can reduce and the alloying of fusion apparatus noble metals such as () particularly Pt.Therefore, Sb2O3The content of composition, Desirably less than 1.0%, more preferably it is less than 0.5%, more preferably less than 0.3%, more preferably It is less than 0.1%.
Sb2O3Composition, can use Sb as raw material2O3、Sb2O5、Na2H2Sb2O7·5H2O etc..
It addition, make glass limpid and the composition of deaeration, it is not only limited in above-mentioned Sb2O3Composition, it is possible to use glass Fining agent, deaeration agent or the combinations thereof being widely known by the people in manufacture field.
Relative to the Ln calculated with quality % of oxide benchmark2O3The total amount of composition, relative to the oxidation in addition to F composition The quality of thing benchmark, with the ratio of content of the F composition that quality % calculates, it is usually desirable to less than more than 0.05 1.00.
Particularly, by making this ratio more than 0.05, partial dispersion ratio can be improved further.Therefore, this mass ratio F /Ln2O3, it is usually desirable to 0.05 as lower limit, more preferably with 0.07 as lower limit, more preferably with 0.09 is lower limit, more preferably with 0.11 as lower limit.
On the other hand, by making this ratio below 1.00, glass can be made to be difficult to devitrification.Therefore, this mass ratio F/ Ln2O3, it is usually desirable to less than 1.00, more preferably it is less than 0.70, more preferably less than 0.50, more Ideally less than 0.30.
SiO2Composition and B2O3The total amount (quality sum) of composition, it is usually desirable to less than more than 15.0% 50.0%.
Particularly, by making this and more than 15.0%, stable glass can be formed relatively easily.Therefore, this quality it (SiO2+B2O3), it is usually desirable to more than 15.0%, more preferably it is greater than 18.0%, more preferably More than 21.0%, more preferably it is greater than 23.0%.
On the other hand, by making this and below 50.0%, the reduction of refractive index can be suppressed.Therefore, this quality sum (SiO2 +B2O3), it is usually desirable to less than 50.0%, more preferably it is less than 43.0%, more preferably less than 40.0%, More preferably it is less than 35.0%, more preferably less than 30.0%, is more preferably less than 27.0%.
Relative to the quality of the oxide benchmark in addition to F composition, with the content of the F composition that quality % calculates, it is with oxidation The SiO that quality % of thing benchmark calculates2Composition and B2O3The ratio of composition total amount, it is usually desirable to more than 0.50 5.00 Below.
Particularly, by making this ratio more than 0.50, the partial dispersion ratio of glass can be improved, and glass can be reduced Glass transition temperature.Therefore, this mass ratio (SiO2+B2O3)/F, it is usually desirable to 0.50 as lower limit, more It is preferably with 1.00 as lower limit, more preferably with 1.50 as lower limit, more preferably with 1.80 as lower limit, more Add and be preferably with 2.10 as lower limit, more preferably with 2.31 as lower limit.
On the other hand, by making this ratio below 5.00, glass can be made to be difficult to devitrification.It addition, this mass ratio (SiO2 +B2O3)/F, it is usually desirable to less than 5.00, is more preferably less than 4.00, more preferably less than 3.50, More preferably 3.00 it are less than.
Relative to SiO2Composition and B2O3The total amount of composition, Ln2O3The ratio (mass ratio) of composition total amount, compares reason Think is more than 0.50.Accordingly, refractive index and the stability of glass can be improved.Therefore, mass ratio Ln2O3/(SiO2 +B2O3), it is usually desirable to 0.50 as lower limit, more preferably with 1.00 as lower limit, more preferably with 1.30 is lower limit, more preferably with 1.50 as lower limit, is more with 1.63 as lower limit through think.
It addition, mass ratio Ln2O3/(SiO2+B2O3) the upper limit, mostly be below substantially 8.00, more particularly 6.00 Hereinafter, more specifically less than 5.00.
Relative to the quality of the oxide benchmark in addition to F composition, with the content of the F composition that quality % calculates, it is with oxygen The TiO that quality % of compound benchmark calculates2Composition, Nb2O5Composition, WO3Composition and Bi2O3The ratio of the total amount of composition Example, it is usually desirable to less than 0.50.Accordingly, the reduction of Abbe number can be suppressed.Therefore, this mass ratio (TiO2+ Nb2O5+WO3+Bi2O3)/F, it is usually desirable to 0.50 as the upper limit, more preferably with 0.45 as the upper limit, More preferably with 0.40 as the upper limit, more preferably with 0.35 as the upper limit, more preferably with 0.27 as the upper limit.
RO composition (in formula, R be from the group being made up of Mg, Ca, Sr, Ba select more than one) content it (quality sum), it is usually desirable to less than 60.0%.
Particularly, by making this and below 60.0%, it is possible to reduce due to the too high devitrification caused of RO component content, and And the reduction of refractive index can be suppressed.Therefore, the quality sum of the content of RO composition, it is usually desirable to less than 60.0%, More preferably 55.0% it is less than, more preferably less than 45.0%, more preferably less than 40.0%, more manage That thinks is less than 35.0%, is more preferably less than 30.0%.Particularly, in the first optical glass, Ro composition The quality sum of content, can be less than 25.0%, more preferably might be less that 20.0%.
On the other hand, by making this and more than 0%, the meltbility of frit and the stability of glass can be improved.Special Not, in the second optical glass, it is by making this and more than 5.0%, it is possible to obtain these effects.Therefore, RO becomes The total content divided, it is usually desirable to more than 0%, is more preferably greater than 1.0%, more preferably more than 3.0%, More preferably 5.0% it is greater than, more preferably can also be more than 10.0%.Particularly, in the second optical glass, The total content of RO composition, it is usually desirable to more than 5.0%, is more preferably greater than 10.0%, the most greatly In 15.0%, more preferably it is greater than 20.0%, more preferably can also be more than 23.0%.
Relative to RO composition (in formula, R be from the group being made up of Mg, Ca, Sr, Ba select more than one) Content sum, content ratio (mass ratio) of BaO composition is preferred more than 0.50.Accordingly, can be rolled over relatively easily The higher glass of rate of penetrating.Therefore, this mass ratio (BaO/RO), it is usually desirable to 0.50 as lower limit, more manage Think is with 0.60 as lower limit, more preferably with 0.70 as lower limit, more preferably with 0.75 as lower limit, more It is preferably with 0.85 as lower limit.
On the other hand, the upper limit of this ratio can also be 1.00.
Ln2O3Composition (in formula, Ln be from the group being made up of La, Gd, Y, Yb select more than a kind) total amount with And the content sum (quality sum) of BaO composition more than 30.0% less than 85.0% preferably.
Particularly, by making this and more than 30.0%, the refractive index of glass can be improved further.Therefore, this quality it (Ln2O3+ BaO), it is usually desirable to 30.0% as lower limit, more preferably with 45.0% as lower limit, more It is preferably with 56.0% as lower limit, more preferably with 60.0% as lower limit, more preferably with 63.0% as lower limit.
On the other hand, by making this and below 85.0%, glass can be made to be difficult to devitrification.Therefore, this quality sum (Ln2O3+ BaO), it is usually desirable to less than 85.0%, more preferably it is less than 83.0%, the least In 80.0%, more preferably it is less than 78.0%.
Relative to SiO2Composition and B2O3The total amount of composition, Ln2O3Composition (in formula, Ln be from by La, Gd, Y with And more than a kind selected in the group of Yb composition) and the ratio (mass ratio) of content sum of BaO composition, compare reason Think is more than 1.00.Accordingly, refractive index and the stability of glass can be improved.Therefore, mass ratio (Ln2O3+BaO) /(SiO2+B2O3), it is usually desirable to 1.00 as lower limit, more preferably with 1.30 as lower limit, more manage Think is with 1.50 as lower limit, more preferably with 1.70 as lower limit, more preferably with 2.00 as lower limit, more It is preferably with 2.50 as lower limit.
It addition, mass ratio (Ln2O3+BaO)/(SiO2+B2O3) the upper limit, mostly be below substantially 8.00, more Body is less than 6.00, more specifically less than 4.00.
Rn2O composition (in formula, Rn be from the group being made up of Li, Na, K select more than one) content sum (quality sum), it is usually desirable to less than 10.0%.Accordingly, the reduction of the refractive index of glass can be suppressed, and also Devitrification can be reduced by improving the stability of glass.Therefore, Rn2The total content of O composition, it is usually desirable to 10.0% Hereinafter, more preferably it is less than 6.0%, more preferably less than 5.0%, is more preferably less than 4.0%, more Ideally less than 3.0%.
On the other hand, particularly in the second optical glass, Rn2The content sum of O composition can also be more than 0%.Accordingly, Stable glass can be formed relatively easily.Therefore, Rn2The total content of O composition, it is usually desirable to more than 0%, more Ideally more than 1.0%, more preferably can also be more than 1.5%.
Ta2O5Composition, ZrO2Composition and Al2O3The content sum (quality sum) of composition, it is usually desirable to 20.0% Below.Accordingly, the stability of glass can be improved, and also the reduction of partial dispersion ratio can be suppressed.Therefore, this quality Sum (Ta2O5+ZrO2+Al2O3), it is usually desirable to less than 20.0% as the upper limit, more preferably to be less than 10.0% is the upper limit, more preferably with less than 5.0% as the upper limit, more preferably with less than 2.5% as the upper limit, more Add be preferably with less than 1.5% as the upper limit.
<composition about not containing>
Secondly, to the composition that should not contain in the optical glass of the present invention and do not contain the composition being preferred and illustrate.
In the optical glass of the present invention, for other compositions, can be in the scope of the glass performance not destroying the present application In, it is added as required.But, due to GeO2Branch is become to improve the dispersivity of glass, therefore actually without promising Good.
It addition, each transition metal composition in addition to Ti, Zr, Nb, W, La, Gd, Y, Yb, Lu, such as Hf, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Mo, Ce, Nd etc., even if having individually or mixedly Also can colour containing glass in the case of each composition a small amount of, the characteristic that the light of the specific wavelength of visibility region is absorbed, The most particularly in using the optical glass of wavelength of visibility region, actually do not contain and be preferred.
Additionally, the lead compounds such as PbO and As2O3Each Deng arsenic compound and Th, Cd, Tl, Os, Be, Se Composition, in recent years has and limits its trend used as harmful chemical, not only in the production process of glass, and at place Science and engineering sequence and until in the later process of commercialization, be required for taking environmental protective measure.Therefore, paying attention to environment In the case of impact, in addition to being inevitably mixed into, actually do not contain these compositions and be preferred.Accordingly, at optical glass In actually without pollute environment material.It is therefore not necessary to take special environmental protective measure just can manufacture, process and This optical glass discarded.
[manufacture method]
The optical glass of the present invention, such as, is carried out as follows manufacture.It is to say, for making each composition at the content range of regulation In and mix above-mentioned raw materials equably, manufactured mixture is being put in platinum crucible, silica crucible or alumina crucible After carrying out pre-fusion, put in gold crucible, platinum crucible, platinum alloy crucibles or iridium crucible and the temperature of 900～1400 DEG C Melting 1～5 hour in the range of degree, uniform stirring also carries out froth breaking etc., carries out after then temperature being reduced to less than 1200 DEG C Finally stir and remove striped, and use mould shaping to manufacture.Here, it is molded by use as obtaining Mould and the method for glass that is molded include, make molten glass while one end of mould flows down, from mould The other end by the method for the glass pull-out of shaping, and molten glass is injected mould the method making it slowly cool down.
[physical property]
The optical glass of the present invention has high index of refraction and low dispersion (high Abbe number).
Refractive index (the n of the optical glass of the present inventiond), it is usually desirable to 1.50 as lower limit, more preferably with 1.55 is lower limit, more preferably with 1.60 as lower limit, more preferably with 1.63 as lower limit.Particularly, first Refractive index (the n of optical glassd), it is usually desirable to 1.65 as lower limit, more preferably with 1.66 as lower limit, More preferably can also be with 1.67 as lower limit.
Refractive index (the n of the optical glass of the present inventiond) the upper limit, it is usually desirable to less than 1.80, more preferably Less than 1.77, more preferably might be less that 1.74.Particularly, the upper limit of the refractive index of the second optical glass, compares It is preferably less than 1.74, more preferably less than 1.72, more preferably less than 1.70, the most also Can be below 1.67.
Abbe number (the ν of the optical glass of the present inventiond), it is usually desirable to more than 45, more preferably more than 48, More preferably more than 50.5, more preferably more than 51, more preferably more than 52, more preferably with 54 is lower limit, more preferably with 56 as lower limit, more preferably with 58 as lower limit.It addition, the light of the present invention Learn the Abbe number (ν of glassd), it is usually desirable to less than 65, more preferably it is less than 64, more preferably Less than 63, more preferably it is less than 60.
The optical glass of the present invention, owing to having such refractive index and Abbe number, therefore is of value to optical design, particularly, It is possible not only to realize higher imaging characteristic etc. and the miniaturization of optical system, it is also possible to the free degree of expansion optical design.
Here, the optical glass of the present invention, refractive index (nd) and Abbe number (νd), it is usually desirable to meet (-0.01νd+2.15)≦nd≦(-0.01νd+ 2.25) relation.The glass of the specific composition of the present invention, makes refractive index (nd) And Abbe number (νd) meet this relation, i.e. can obtain stable glass.
Therefore, in the optical glass of the present invention, refractive index (nd) and Abbe number (νd), it is usually desirable to full Foot nd≧(-0.01νd+ 2.15) relation, more preferably meets nd≧(-0.01νd+ 2.17) relation, more It is preferably to meet nd≧(-0.01νd+ 2.20) relation, more preferably meets nd≧(-0.01νd+ 2.23) Relation.
On the other hand, in the optical glass of the present invention, refractive index (nd) and Abbe number (νd), more satisfactory It is to meet nd≦(-0.01νd+ 2.35) relation, more preferably meets nd≦(-0.01νd+ 2.32) relation, More preferably meet nd≦(-0.01νd+ 2.30) relation, more preferably meets nd≦(-0.01νd+2.29) Relation, more preferably meet nd≦(-0.01νd+ 2.27) relation.
The optical glass of the present invention, it is usually desirable to there is higher partial dispersion ratio (θ g, F).
More specifically, the partial dispersion ratio (θ g, F) of the optical glass of the present invention, it is usually desirable to be with 0.515 Lower limit, more preferably with 0.520 as lower limit, more preferably with 0.525 as lower limit, more preferably with 0.528 For lower limit, more preferably with 0.530 as lower limit.On the other hand, the partial dispersion ratio (θ of the optical glass of the present invention G, F) the upper limit and be not particularly limited, but desirably 0.630, more preferably 0.610, more preferable Be can also to be 0.570.It addition, partial dispersion ratio (θ g, F) and the Abbe number (ν of the optical glass in the present inventiond) relation in, it is usually desirable to meet (θ g, F) (-0.00162 × νd+ 0.6150) relation.
So, in the optical glass of the present invention, compared with the glass being in the past widely known by the people containing more rare-earth complexes composition There is higher partial dispersion ratio (θ g, F).Therefore, while the high index of refraction realizing glass and low dispersion, The optical element formed by this optical glass can be preferably employed in the correction of chromatic aberation.
Here, at partial dispersion ratio (θ g, F) and the Abbe number (ν of optical glass of the present inventiond) relation in, Desirably with (-0.00162 × νd+ 0.6150) it is lower limit, more preferably with (-0.00162 × νd+ 0.6200) it is lower limit, more preferably with (-0.00162 × νd+ 0.6250) be lower limit, more preferably with (-0.00162×νd+ 0.6300) it is lower limit.On the other hand, the optical glass of the present invention with Abbe number (νd) pass The upper limit of the partial dispersion ratio (θ g, F) in system is also not particularly limited, but mostly is substantially (-0.00162 × νd+0.6800) Hereinafter, more particularly (-0.00162 × νd+ 0.6700) below, more specifically (-0.00162 × νd+0.6600) Below.The glass of the specific composition of the present invention, makes partial dispersion ratio (θ g, F) and Abbe number (νd) meet this pass System, i.e. can obtain more stable glass.
Described partial dispersion ratio (θ g, F) and Abbe number (νd) relational expression, with partial dispersion ratio as y-axis, with Abbe number is in the rectangular coordinate system of x-axis, uses the straight line parallel with normal line to represent.Normal line represents and is widely known by the people in the past Partial dispersion ratio (θ g, F) and the Abbe number (ν of glassdLinear relationship between), with partial dispersion ratio (θ g, F) it is y-axis, with Abbe number (νd) be x-axis rectangular coordinate system in, with connecting the portion of NSL7 and PBM2 of depicting Color separation dissipate than and the straight line of 2 of Abbe number represent (with reference to Fig. 1).And, the part of the glass being in the past widely known by the people Dispersion, than the relation with Abbe number, substantially repeats with normal line.
Here, NSL7 and PBM2 is the optical glass that Obara Corporation manufactures, the Abbe number (ν of PBM2d) it is 36.3, partial dispersion ratio (θ g, F) is 0.5828, the Abbe number (ν of NSL7d) it is 60.5, partial dispersion ratio (θ G, F) it is 0.5436.
The optical glass of the present invention, the devitrification resistance (in the description, being sometimes only called " devitrification resistance ") during to manufacture glass Higher and more stable glass is preferred.Accordingly, the transmissivity caused by the crystallization etc. of glass can be suppressed when manufacturing glass Reduction, therefore this optical glass can be preferably employed in the optical element that lens etc. make visible light-transmissive.It addition, As the standard that devitrification resistance when representing manufacture glass is higher, for example, it is possible to it is relatively low to list liquidus temperature.
[prefabricated component and optical element]
On the basis of manufactured optical glass, by utilize such as polishing method or again heat stamping and shaping with And the method for the compression molding such as precise punch forming, it is possible to produce glass forming body.It is to say, can be to optical glass Be ground and the machining such as polishing and manufacture glass forming body, or the prefabricated component utilizing optical glass manufacture is being entered It is processed by shot blasting after row heat stamping and shaping again and manufactures glass forming body, or manufacture by being processed by shot blasting Prefabricated component and the prefabricated component being molded by well-known float glass process shaping etc. are carried out precise punch forming and manufacture glass shaping Body.Additionally, the method manufacturing glass forming body, it is not limited in these methods.
So, the optical glass of the present invention glass forming body formed, it is of value to various optical element and optical design, Particularly, it is preferred for the optical element such as lens or prism.By improving the stability of glass, larger caliber can be formed Glass forming body, be therefore possible not only to realize the maximization of optical element, and be used in camera and projecting apparatus etc. During optical instrument, it is possible to achieve high definition and high-precision imaging characteristic and projection property.
It addition, by improving partial dispersion ratio, optical element can be effectively applied in the chromatic aberration correction of optical system, Such as, in the case of optical element is applied to camera, the object of shooting can be shown exactly, and by light In the case of element is applied to projecting apparatus, desired image can be projected more excellently.
[embodiment]
The composition of the glass of embodiments of the invention (No.A1～No.A35, No.B1～No.B11) and these glass Refractive index (nd), Abbe number (νd) and partial dispersion ratio (θ g, F) as shown in table 1～table 7.Wherein, Embodiment (No.A1～No.A35) is the embodiment of the first optical glass, and embodiment (No.B1～No.B11) is second The embodiment of optical glass.It addition, following example are for the purpose of example all the time, it is not limited in these embodiments.
The glass of embodiment, all selects be respectively equivalent to the oxide of each component materials, hydroxide, carbonate, nitric acid High-purity raw used in the common optical glass such as salt, fluoride, hydroxide, metaphosphoric acid compound, weighs also Uniformly after mixing, put into platinum crucible, heated 2 hours within the temperature range of 1250～1300 DEG C by electric furnace, make glass Glass raw materials melt, and after carrying out froth breaking by the melted frit of stirring, temperature is reduced to 900～1070 DEG C and stirs again Pour into mould after even so that it is Slow cooling, thus manufacture glass.
Here, when frit being melted and obtain glass, due to F composition and B2O3The volatilization of composition, glass Change is there occurs between composition and the composition of obtained glass of raw material.
About each composition, the composition of frit and the relation of the composition of glass, especially with B2O3Composition 16% with On, and in the case of the content of F composition is less than 45.0%, approximately as.
B2O3Composition: (content in glass)=0.35 × (content in frit)+10.3 (quality %)
F composition: (content in glass)=0.44 × (content in frit)+1.39 (quality %)
Based on these numerical expressions, by by F composition, B2O3Composition and SiO2Composition content in glass is converted into glass After content in raw material, as additional content, the total amount of the content of each composition is converted into 100% using the content of F composition, Can be in the hope of the composition of frit.
Refractive index (the n of the glass of embodimentd), Abbe number (νd) and partial dispersion ratio (θ g, F), according to day The industry of this optics nitre can standard JOGIS01-2003 be measured.
Additionally, according to the refractive index (n recordedd) and Abbe number (νd) value, in relational expression nd=-a1×νd+b1 In, try to achieve gradient a1Intercept b when 0.011。
Additionally, according to the Abbe number (ν recordedd) and the value of partial dispersion ratio (θ g, F), relational expression (θ g, F)=-a2×νd+b2In, try to achieve gradient a2Intercept b when 0.001622。
Additionally, the glass used in this mensuration, employ and Slow cooling cooling rate is set to-25 DEG C/hr and with annealing Stove carries out the glass processed.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
It is as shown in the table, the optical glass of embodiments of the invention, refractive index (nd) it is 1.50, more specifically 1.61 Above, and this refractive index (nd) below 1.80, more specifically below 1.76, all in required scope In.Particularly, in the embodiment of the first optical glass, refractive index (nd) it is more than 1.65.It addition, at the second light In the glass of the embodiment learning glass, refractive index (nd) below 1.74, more particularly below 1.65.
It addition, the optical glass of embodiments of the invention, Abbe number (νd) more than 45, and this Abbe number (νd) Below 65, more specifically below 63, all in required scope.Particularly, at the first optical glass In embodiment, Abbe number (νd) all below 60.Additionally, in the embodiment of the second optical glass, Abbe number (νd) it is more than 59.
It addition, the optical glass of embodiments of the invention, refractive index (nd) and Abbe number (νd) meet (-0.01 νd+2.15)≦nd≦(-0.01νd+ 2.35) relation.Particularly, in the embodiment of the first optical glass, refractive index (nd) and Abbe number (νd) meet (-0.01 νd+2.20)≦nd≦(-0.01νd+ 2.29) relation.It addition, In the embodiment of the second optical glass, refractive index (nd) and Abbe number (νd) meet (-0.01 νd+2.24)≦nd ≦(-0.01νd+ 2.28) relation.
Additionally, the refractive index (n of glass of the embodiment about the first optical glassd) and Abbe number (νd) relation, As shown in Figure 2.It addition, the refractive index (n of glass of the embodiment about the second optical glassd) and Abbe number (νd) Relation, as shown in Figure 3.
These optical glass, are all the stable glass of non-devitrification.
Therefore, it can the optical glass of clear and definite embodiments of the invention, refractive index (nd) and Abbe number (νd) all exist In required scope, and it is possible to obtain the optical glass that stability is higher.
It addition, the optical glass of embodiments of the invention, its partial dispersion ratio (θ g, F), more than 0.515, has relatively High.Particularly, in the embodiment of the first optical glass, its partial dispersion ratio (θ g, F) more than 0.520, Specifically in more than 0.525.It addition, in the embodiment of the second optical glass, its partial dispersion ratio (θ g, F) exists More than 0.533.
It addition, the optical glass of embodiments of the invention, its partial dispersion ratio (θ g, F) and Abbe number (νdBetween) Meet (θ g, F) (-0.00162 × νd+ 0.6150) relation, more specifically meets (θ g, F) (-0.00162 ×νd+ 0.6160) relation.Particularly, in the embodiment of the second optical glass, meet (θ g, F) (-0.00162 ×νd+ 0.6280) relation.
Additionally, about the partial dispersion ratio (θ g, F) of glass of embodiment of the first optical glass and Abbe number (νd) Relation, as shown in Figure 4.Additionally, the partial dispersion ratio (θ g, F) of glass of the embodiment about the second optical glass And Abbe number (νd) relation, as shown in Figure 5.
In sum, the optical glass of embodiments of the invention, its partial dispersion ratio (θ g, F) is bigger, it is therefore apparent that The optical element obtained by this optical glass can correcting chromatic aberration effectively.
Therefore, the optical glass of embodiments of the invention, there is high index of refraction and low dispersion, stability is higher, aobvious and easy See, the correction of chromatic aberation can be preferably employed in.
Additionally, use the optical glass that obtains according to embodiments of the invention, carry out reheating compressing after be ground and throw Light, is processed into the shape of lens and prism.It addition, use the optical glass of embodiments of the invention, form precision stamping and become Type prefabricated component, carries out precise punch forming processing to this precise punch forming prefabricated component.Under any circumstance, in heating Glass after softening does not the most occur the problem such as opalization and devitrification, can stably be processed into various lens and prism Shape.
Above, the present invention is illustrated for the purpose of example, but the present embodiment is the most only for the purpose of example. It should be understood that those skilled in the art can be carried out respectively in the case of without departing from the thought of the present invention and scope Plant change.

Claims (20)

1. an optical glass, it is characterised in that calculate, containing B with quality % of oxide benchmark2O3Composition 8.0～ 40.0%, Ln2O3Composition 15.0～80.0%, in formula, Ln is to select from the group being made up of La, Gd, Y and Yb More than a kind,
Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 50.0% F composition,
There is refractive index n of less than more than 1.50 1.80dAnd the Abbe number ν of less than more than 45 65d。
Optical glass the most according to claim 1, it is characterised in that calculate with quality % of oxide benchmark, contain Ln2O3Composition 25.0～80.0%, in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb,
There is refractive index n of less than more than 1.65 1.80d。
Optical glass the most according to claim 1 and 2, it is characterised in that calculate with quality % of oxide benchmark,
SiO2Composition is 0～20.0%,
BaO composition is 0～35.0%.
Optical glass the most according to claim 1, it is characterised in that calculate with quality % of oxide benchmark, contain SiO2Composition 1.0～20.0%, B2O3Composition 10.0～40.0%, Ln2O3Composition 15.0～60.0% and BaO composition 5.0～55.0%, in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y and Yb,
Relative to the quality of the oxide benchmark in addition to F composition, calculate with quality %, containing less than more than 5.0% 40.0% F composition,
There is refractive index n of less than more than 1.50 1.74dAnd the Abbe number ν of less than more than 45 65d。
5. according to the optical glass described in any one of Claims 1-4, it is characterised in that with oxide benchmark Quality % calculates,
La2O3Composition is 0～60.0%,
Gd2O3Composition is 0～30.0%,
Y2O3Composition is 0～20.0%,
Yb2O3Composition is 0～20.0%,
TiO2Composition is 0～20.0%,
Nb2O5Composition is 0～20.0%,
WO3Composition is 0～15.0%,
Bi2O3Composition is 0～20.0%,
MgO composition is 0～10.0%,
CaO composition is 0～20.0%,
SrO composition is 0～25.0%,
Li2O composition is 0～10.0%,
Na2O composition is 0～10.0%,
K2O composition is 0～10.0%,
ZnO component is 0～20.0%,
P2O5Composition is 0～10.0%,
GeO2Composition is 0～10.0%,
Ta2O5Composition is 0～20.0%,
ZrO2Composition is 0～20.0%,
Al2O3Composition is 0～20.0%,
Ga2O3Composition is 0～20.0%,
TeO2Composition is 0～20.0%,
SnO2Composition is 0～5.0%, and
Sb2O3Composition is 0～1.0%.
6. according to the optical glass described in any one of claim 1 to 5, it is characterised in that the matter of oxide benchmark Amount compares F/Ln2O3It it is less than more than 0.05 1.00, here, Ln2O3The content of composition is with quality % of oxide benchmark The content calculated, the content of F composition is the quality relative to the oxide benchmark in addition to F composition, calculates with quality % Content.
7. according to the optical glass described in any one of claim 1 to 6, it is characterised in that the matter of oxide benchmark Amount sum (SiO2+B2O3) it is less than more than 15.0% 50.0%.
8. according to the optical glass described in any one of claim 1 to 7, it is characterised in that the matter of oxide benchmark Amount is than (SiO2+B2O3)/F is less than more than 0.50 5.00, here, SiO2Composition and B2O3The content of composition, be The content calculated with quality % of oxide benchmark, the content of F composition is relative to the oxide benchmark in addition to F composition Quality, the content calculated with quality %.
9. according to the optical glass described in any one of claim 1 to 8, it is characterised in that the matter of oxide benchmark Amount compares Ln2O3/(SiO2+B2O3) it is more than 0.50, in formula, Ln is to select from the group being made up of La, Gd, Y and Yb More than a kind selected.
10. according to the optical glass described in any one of claim 1 to 9, it is characterised in that the matter of oxide benchmark Amount is than (TiO2+Nb2O5+WO3+Bi2O3)/F is less than 0.50, here, TiO2Composition, Nb2O5Composition, WO3 Composition and Bi2O3The content of composition is the content calculated with quality % of oxide benchmark, the content of F composition be relative to The quality of the oxide benchmark in addition to F composition, the content calculated with quality %.
11. according to the optical glass described in any one of claim 1 to 10, it is characterised in that oxide benchmark The quality sum of RO composition is less than 60.0%, and in formula, R is to select from the group being made up of Mg, Ca, Sr and Ba More than a kind.
12. according to the optical glass described in any one of claim 1 to 11, it is characterised in that oxide benchmark Mass ratio (BaO/RO) is more than 0.50, and in formula, R is 1 selected from the group being made up of Mg, Ca, Sr and Ba More than Zhong.
13. according to the optical glass described in any one of claim 1 to 12, it is characterised in that oxide benchmark Quality sum (Ln2O3+ BaO) it is less than more than 30.0% 85.0%, in formula, Ln is from by La, Gd, Y and Yb group More than a kind selected in the group become.
14. according to the optical glass described in any one of claim 1 to 13, it is characterised in that oxide benchmark Mass ratio (Ln2O3+BaO)/(SiO2+B2O3) it is more than 1.00, in formula, Ln is from by La, Gd, Y and Yb More than a kind selected in the group of composition.
15. according to the optical glass described in any one of claim 1 to 14, it is characterised in that oxide benchmark Rn2The quality sum of O composition is less than 10.0%, and in formula, Rn is 1 selected from the group being made up of Li, Na and K More than Zhong.
16. according to the optical glass described in any one of claim 1 to 15, it is characterised in that oxide benchmark Quality sum (Ta2O5+ZrO2+Al2O3) it is less than 20.0%.
17. according to the optical glass described in any one of claim 1 to 16, it is characterised in that refractive index ndAnd Abbe number νdMeet (-0.01 νd+2.15)≦nd≦(-0.01νd+ 2.35) relation.
18. 1 kinds of optical elements, it is characterised in that by the optical glass structure described in any one of claim 1 to 17 Become.
19. 1 kinds of prefabricated components, it is characterised in that be made up of the optical glass described in any one of claim 1 to 17, And for polishing and/or precise punch forming.
20. 1 kinds of optical elements, it is characterised in that the prefabricated component described in claim 19 is carried out precision stamping processing and Become.
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