CN106277753A - Optical glass and optical element - Google Patents
Optical glass and optical element Download PDFInfo
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- CN106277753A CN106277753A CN201610576353.5A CN201610576353A CN106277753A CN 106277753 A CN106277753 A CN 106277753A CN 201610576353 A CN201610576353 A CN 201610576353A CN 106277753 A CN106277753 A CN 106277753A
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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
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- 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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Abstract
The present invention relates to optical glass and optical element, refractive index (n can be provided more at a low priced) and Abbe number (νd) in desired scope and the high optical glass of devitrification resistance.A kind of optical glass, relative to the glass gross mass of the composition converted with oxide, in terms of quality %, containing 1.0～the B of 30.0%2O3Composition and 10.0～the La of 50.0%2O3Composition and Ta2O5The content of composition is less than 20.0%, and it has the refractive index (n of more than 1.80d) and have more than 35 and less than 50 Abbe number (νd).Described optical element is with this optical glass as mother metal.
Description
The application is filing date on 08 23rd, 2011, Application No. 201110243822.9, invention entitled " optics
Glass and optical element " the divisional application of application.
Technical field
The present invention relates to optical glass and optical element.
Background technology
In recent years, the digitized of instrument of optical system, high-definition is used to develop rapidly, in digital camera, shooting
In the various optical instrument fields such as shadow instrument scooped up by machine etc., the image reproducing such as projector, projection TV (projection) instrument, in the urgent need to
Reduce lens, the quantity of the optical element such as prism used in optical system, so that optical system entirety lightweight and little
Type.
In the optical glass making optical element, particularly to seeking optical system entirety lightweight and miniaturization
, there is the refractive index (n of more than 1.80d) and have more than 35 and less than 50 Abbe number (νd) high-refractivity and low-dispersion glass
The demand of glass is the most vigorous.As this high-refractivity and low-dispersion glass, it is known to the class with patent documentation 1～4 as representative
Glass composition.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2001-348244 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2006-016293 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2009-102215 publication
Patent documentation 4: Japanese Unexamined Patent Publication 2009-203083 publication
Summary of the invention
The problem that invention is to be solved
As the method being made optical element by optical glass, for example, as it is known that have: to the gob formed by optical glass or
Glass blocks carries out grinding and grinding, thus the method obtaining the shape of optical element；By the gob formed by optical glass or glass
Glass block reheats, molding (reheating is compressing), and the method that gained glass forming body is carried out grinding and grinding；And, use
Through preform material molding (precise compression molding) that the mould of Ultra-precision Turning will be obtained by gob or glass blocks, thus obtain
The method of the shape of optical element.No matter which kind of method, is required to when being formed gob or glass blocks by the frit dissolved,
Reduce the devitrification of the glass formed.Here, if the internal crystallize of gained gob or glass blocks and there is devitrification, the most cannot
Obtain the glass being applicable to optical element.
It addition, for the material cost reducing optical glass, it is desirable to constitute the cost of material of each composition of optical glass to the greatest extent
May be cheap.It addition, for the manufacturing cost reducing optical glass, it is desirable to the meltability of raw material is high, i.e. wish that it is lower
At a temperature of melt.But, the glass composition described in patent documentation 1～4 is difficult to tackle above-mentioned various requirement fully.
The present invention is carried out in view of the above problems, it is intended that obtain refractive index (n more at a low priced) and Abbe
Number (νd) in desired scope and the high glass of devitrification resistance.
For solving the scheme of problem
The present inventor etc. conduct in-depth research for solving the problems referred to above, it was found that by containing B2O3Composition and
La2O3The glass of composition reduces Ta2O5The content of composition, while there is desired refractive index and Abbe number, glass
Material cost is reduced, and, the liquidus temperature of glass reduces, thus completes the present invention.Specifically, the present invention carries
For below scheme:
(1) a kind of optical glass, relative to the glass gross mass of the composition converted with oxide, in terms of quality %, contains
1.0～the B of 30.0%2O3Composition and 10.0～the La of 55.0%2O3Composition, and Ta2O5The content of composition is less than 20.0%.
(2) according to the optical glass described in (1st) item, in the composition converted with oxide, containing selecting free TiO2Become
Point, Nb2O5Composition and WO3Become more than one compositions in the group being grouped into.
(3) according to the optical glass described in (2nd) item, relative to the glass gross mass of the composition converted with oxide, choosing
Free TiO2Composition, Nb2O5Composition and WO3The content sum becoming more than one compositions in the group being grouped into is more than 0.5%
And less than 40.0%.
(4) according to the optical glass described in (2nd) item or (3rd) item, relative to the glass of the composition converted with oxide
Gross mass, in terms of quality %, contains:
0～the TiO of 20.0%2Composition and/or
0～the Nb of 20.0%2O5Composition and/or
0～the WO of 25.0%3Composition.
(5) according to the optical glass according to any one of (1st)～(4) item, relative to the composition converted with oxide
Glass gross mass, in terms of quality %, possibly together with following each composition:
0～the SiO of 20.0%2Composition and/or
0～the ZrO of 12.0%2Composition.
(6) according to the optical glass according to any one of (1st)～(5) item, relative to the composition converted with oxide
Glass gross mass, B2O3Composition and SiO2The content sum of composition is less than 25.0%.
(7) according to the optical glass according to any one of (1st)～(6) item, with the mass ratio of the composition of oxide conversion
(ZrO2+Ta2O5+Nb2O5)/(B2O3+SiO2) it is less than 2.00.
(8) according to the optical glass according to any one of (1st)～(7) item, relative to the composition converted with oxide
Glass gross mass, in terms of quality %, possibly together with following each composition:
0～the Gd of 45.0%2O3Composition and/or
0～the Y of 30.0%2O3Composition and/or
0～the Yb of 20.0%2O3Composition.
(9) according to the optical glass according to any one of (1st)～(8) item, relative to the composition converted with oxide
Glass gross mass, Ln2O3The quality of composition and be more than 30.0% and less than 75.0%, in formula, Ln is for selecting free La, Gd, Y, Yb
More than one elements in the group of composition.
(10) according to the optical glass described in (9th) item, relative to the glass gross mass of the composition converted with oxide,
Ln2O3The quality of composition and more than 40.0%, in formula, Ln is more than one elements in the group selecting free La, Gd, Y, Yb to form.
(11) according to the optical glass according to any one of (1st)～(10) item, with the quality of the composition of oxide conversion
Compare Ta2O5/(Ln2O3+ZrO2+Nb2O5+WO3) it is less than 0.300, in formula, Ln is in the group selecting free La, Gd, Y, Yb composition
More than one elements.
(12) according to the optical glass according to any one of (1st)～(11) item, relative to the composition converted with oxide
Glass gross mass, in terms of quality %, possibly together with following each composition:
0～the MgO composition of 20.0% and/or
0～the CaO composition of 20.0% and/or
0～the SrO composition of 20.0% and/or
0～the BaO composition of 25.0%.
(13) according to the optical glass described in (12nd) item, relative to the glass gross mass of the composition converted with oxide,
The quality of RO composition and be less than 25.0%, in formula, R is more than one elements in the group selecting free Mg, Ca, Sr, Ba to form.
(14) according to the optical glass according to any one of (1st)～(13) item, relative to the composition converted with oxide
Glass gross mass, in terms of quality %, possibly together with following each composition:
0～the Li of 10.0%2O composition and/or
0～the Na of 10.0%2O composition and/or
0～the K of 10.0%2O composition and/or
0～the Cs of 10.0%2O composition.
(15) according to the optical glass described in (14th) item, relative to the glass gross mass of the composition converted with oxide,
Rn2The quality of O composition and be less than 15.0%, in formula, Rn is more than one yuan in the group selecting free Li, Na, K, Cs to form
Element.
(16) according to the optical glass according to any one of (1st)～(15) item, with the quality of the composition of oxide conversion
Than (B2O3+SiO2+WO3)/(Ln2O3+ZrO2+Li2O) it is more than 0.20 and less than 2.00.
(17) according to the optical glass according to any one of (1st)～(16) item, relative to the composition converted with oxide
Glass gross mass, in terms of quality %, possibly together with following each composition:
0～the P of 10.0%2O5Composition and/or
0～the GeO of 10.0%2Composition and/or
0～the ZnO component of 25.0% and/or
0～the Al of 10.0%2O3Composition and/or
0～the Ga of 10.0%2O3Composition and/or
0～the Bi of 20.0%2O3Composition and/or
0～the TeO of 20.0%2Composition and/or
0～the SnO of 1.0%2Composition and/or
0～the Sb of 1.0%2O3Composition.
(18) according to the optical glass according to any one of (1st)～(17) item, it has the refractive index of more than 1.75
(nd) and have more than 30 and less than 50 Abbe number (νd)。
(19) according to the optical glass according to any one of (1st)～(18) item, it has the liquidus curve of less than 1300 DEG C
Temperature.
(20) a kind of optical element, its with the optical glass according to any one of (1st)～(19) item as mother metal.
(21) a kind of optical instrument, it possesses the optical element described in (20th) item.
The effect of invention
According to the present invention, by containing B2O3Composition and La2O3The glass of composition reduces Ta2O5The content of composition,
While having desired refractive index and Abbe number, glass transition point is reduced, and, the material cost of glass is able to
Reduce.Therefore, it can obtain refractive index (n more at a low priced) and Abbe number (νd) in desired scope and devitrification resistance
High optical glass.
Detailed description of the invention
In the optical glass of the present invention, relative to the glass gross mass of the composition converted with oxide, in terms of quality %, contain
There is the B of 1.0～30.0%2O3Composition and 10.0～the La of 50.0%2O3Composition, and Ta2O5The content of composition is less than 20.0%.
By reducing Ta2O5The content of composition is expensive and need the Ta at high temperature melted2O5The consumption of composition reduces, therefore optics glass
Cost of material and the manufacturing cost of glass are minimized.Meanwhile, by with B2O3Composition and La2O3Composition is basis,
At the refractive index (n with more than 1.80d) and the Abbe number (ν of more than 35 and less than 50dWhile), it is also easy to reduce liquidus curve
Temperature.Therefore, it can obtain refractive index (n more at a low priced) and Abbe number (νd) in desired scope and devitrification resistance
High optical glass, and use its optical element.
Hereinafter, the embodiment of the optical glass of the present invention is described in detail.The present invention is not appointed by implementation below
What limits, and can suitably be changed and implement in the range of the object of the invention.Additionally, 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 of each composition constituting the optical glass of the present invention is as described below.In this manual, there is no spy
Do not mentionlet alone bright in the case of, the content of each composition is all by quality % of the glass gross mass relative to the composition converted with oxide
Represent.Here, refer to " using the composition of oxide conversion ": make at the raw material assuming the glass constituent as the present invention
Oxide, double salt, metal fluoride etc. is in the case of when melted, whole decomposition and inversion are oxide, with the oxygen of this generation
The gross mass of compound is composition during each composition contained in the glass that 100 mass % represent.
About essential component, any composition
In comprising the optical glass of the present invention of a large amount of rare-earth oxide, B2O3Composition is as the oxygen forming glass
Compound and indispensable essential component.Especially by making B2O3The content of composition is more than 1.0%, can improve glass
Devitrification resistance also reduces the dispersion of glass.Accordingly, with respect to the glass gross mass of the composition converted with oxide, B2O3Composition
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 composition is less than 30.0%, may be easy to obtain bigger refractive index, and suppression chemical durability is deteriorated.
Accordingly, with respect to the glass gross mass of the composition converted with oxide, B2O3The upper content limit of composition 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、BPO4Glass is made to be contained within B Deng as raw material2O3Composition.
La2O3Composition is to improve the refractive index of glass and reduce the dispersion of glass thus increase the composition of Abbe number.Especially
It is by making La2O3The content of composition is more than 10.0%, can improve the refractive index of glass.Change accordingly, with respect to oxide
The glass gross mass of the composition calculated, La2O3The content lower limit of composition is preferably 10.0%, more preferably 20.0%, further preferably
It is 25.0%, most preferably 30.0%.On the other hand, by making La2O3The content of composition is less than 55.0%, is more preferably
Less than 50.0%, the stability of glass can be improved and reduce the devitrification of glass.Accordingly, with respect to the composition converted with oxide
Glass gross mass, La2O3The upper content limit of composition is preferably 55.0%, more preferably 50.0%, more preferably
49.0%, most preferably 48.0%.Such as La can be used2O3、La(NO3)3·XH2O (X is arbitrary integer) etc. are as raw material
And make glass be contained within La2O3Composition.
Ta2O5Composition is to improve the refractive index of glass and improve devitrification resistance by reducing the liquidus temperature of glass
Composition, it is any composition in the optical glass of the present invention.Especially by making Ta2O5The content of composition is less than 20.0%,
The Ta of costliness can be reduced2O5The content of composition, therefore can produce with less expensive material cost and have desired optical constant
Optical glass.On the other hand, Ta2O5When the content of composition is more than 20.0%, can be difficult to obtain stable glass.Therefore, relatively
In the glass gross mass of the composition converted with oxide, Ta2O5The upper content limit of composition is preferably 20.0%, is more preferably less than
17.5%, more preferably 13.9%.Here, especially by making Ta2O5The content of composition is less than 9.5%, can drop
The temperature of low melting raw material, thus reduce the energy dissolved needed for raw material, therefore can also reduce the manufacturing cost of optical glass.
Therefore, from this viewpoint, relative to the glass gross mass of the composition converted with oxide, Ta2O5The upper content limit of composition is preferred
It is 9.5%, more preferably 7.0%, most preferably 5.0%.On the other hand, Ta2O5When the content of composition is more than 9.5%, can press down
The coloring of glass processed also improves the refractive index of glass and can improve the devitrification resistance of glass.Therefore, from this viewpoint, phase
The glass gross mass of the composition for converting with oxide, Ta2O5The content lower limit of composition is preferably greater than 9.5%, is more preferably
11.0%, more preferably 12.8%.Such as Ta can be used2O5Glass is made to be contained within Ta Deng as raw material2O5Composition.
In the optical glass of the present invention, preferably comprise the free TiO of choosing2Composition, WO3Composition and Nb2O5One-tenth is grouped into
More than one compositions in group.Thus, even if reducing Ta to reduce the material cost of glass2O5The content of composition, it is also possible to
Improve the refractive index of glass and the devitrification resistance of glass can be improved.Glass accordingly, with respect to the composition converted with oxide
Glass gross mass, selects free TiO2Composition, Nb2O5Composition and WO3The content sum of more than one compositions in the group that one-tenth is grouped into
Lower limit be preferably greater than 0%, more preferably 0.5%, most preferably 1.0%.On the other hand, by that make them and be
Less than 40.0%, it is possible to reduce the coloring that caused by these compositions and can suppress to contain these compositions due to excess and
The devitrification resistance caused is deteriorated.Accordingly, with respect to the glass gross mass of the composition converted with oxide, select free TiO2Composition,
Nb2O5Composition and WO3The upper limit becoming the content sum of more than one compositions in the group that is grouped into is preferably 40.0%, more excellent
Elect 30.0%, more preferably 20.0%, most preferably 8.0% as.
TiO2Composition is the regulation refractive index of glass and Abbe number, the composition improving devitrification resistance, is the optics of the present invention
Any composition in glass.But, TiO2During excess, devitrification resistance can be deteriorated, on the contrary under visible short length (below 500nm)
The absorbance of glass also can be deteriorated.Accordingly, with respect to the glass gross mass of the composition converted with oxide, TiO2The content of composition
The upper limit is preferably 20.0%, more preferably 10.0%, more preferably 8.0%, most preferably 5.0%.Can use such as
TiO2Glass is made to be contained within TiO Deng as raw material2Composition.
Nb2O5Composition is to improve glass refraction and the composition of dispersion, is any one-tenth in the optical glass of the present invention
Point.Especially by making Nb2O5The content of composition is less than 20.0%, can suppress owing to excess contains Nb2O5Composition and cause
Glass devitrification resistance be deteriorated, and suppress glass that the absorbance of visible ray is declined.Therefore, relative to converting with oxide
The glass gross mass of composition, Nb2O5The upper content limit of composition is preferably 20.0%, more preferably 15.0%, most preferably
12.0%.Such as Nb can be used2O5Glass is made to be contained within Nb Deng as raw material2O5Composition.
WO3Composition is the composition of the devitrification resistance improving the refractive index of glass and dispersion, raising glass.Especially by making
WO3The content of composition is less than 25.0%, more preferably less than 20.0%, can reduce the coloring of glass, particularly can make
It is difficult to decline to the absorbance of visible-short wavelength region (less than 500nm).Accordingly, with respect to the composition converted with oxide
Glass gross mass, WO3The upper content limit of composition is preferably 25.0%, more preferably 20.0%, more preferably 15.0%,
It is preferably 12.0%.Even if additionally, the optical glass of the present invention does not contains WO3Composition can also obtain has desired optics
Constant and the glass of devitrification resistance, but by containing WO3Composition, the liquidus temperature of glass can reduce further, the most permissible
Improve the devitrification resistance of glass further.Accordingly, with respect to the glass gross mass of the composition converted with oxide, WO3Composition
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
Glass is made to be contained within WO3Composition.
SiO2Composition be improve melten glass viscosity, promote stabilization formed, reduce for optical glass not
Preferably the composition of devitrification (crystal precipitation), is any composition in the optical glass of the present invention.Especially by making SiO2Become
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 of the composition converted with oxide, SiO2The upper content limit of composition is preferably 20.0%, more excellent
Elect 15.0%, most preferably 10.0% as.Even if although additionally, not containing SiO2Composition also will not produce technical negative shadow
Ring, but, by containing SiO2Composition, the liquidus temperature of glass can reduce, and glass therefore can be made to be more difficult to devitrification.Therefore,
Relative to the glass gross mass of the composition converted with oxide, SiO2The content lower limit of composition is preferably 0.1%, is more preferably
1.0%, more preferably 2.0%.Even if particularly from containing TiO2Composition, WO3Composition can also make glass be difficult to colour
Viewpoint is set out, SiO2The content of composition is most preferably more than 4.0%.Such as SiO can be used2、K2SiF6、Na2SiF6Deng conduct
Raw material and make glass be contained within SiO2Composition.
ZrO2Composition contributes to high index of refraction and the composition of low dispersion of glass, is appointing in the optical glass of the present invention
Meaning composition.But, if ZrO2Amount cross devitrification resistance can be made the most on the contrary to be deteriorated.Accordingly, with respect to the group converted with oxide
The glass gross mass become, ZrO2The upper content limit of composition is preferably 12.0%, more preferably 10.0%, most preferably 8.0%.This
Outward, although even if not containing ZrO2Composition can also obtain desired glass, but, by containing ZrO2Composition, can be easy
Obtain the performance of high-refractivity and low-dispersion, and be readily available the effect improving devitrification resistance.Change accordingly, with respect to oxide
The glass gross mass of the composition calculated, ZrO2The content lower limit of composition is preferably greater than 0%, more preferably 0.5%, most preferably
1.0%.Such as ZrO can be used2、ZrF4Glass is made to be contained within ZrO Deng as raw material2Composition.
In the optical glass of the present invention, B2O3Composition and SiO2The quality of composition and preferably less than 25.0%, more preferably
It is less than 23.0%.Thus, it is possible to suppression is due to containing B2O3Composition and SiO2Composition and the decline of refractive index that causes, can
To be readily available desired high index of refraction.Accordingly, with respect to the glass gross mass of the composition converted with oxide, B2O3Composition
And SiO2The upper limit of the quality sum of composition is preferably 25.0%, more preferably 23.0%, more preferably 21.0%, optimum
Choosing is less than 20.0%.
It 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 ZrO that material cost is high can be reduced2Composition, Ta2O5Composition and Nb2O5The content of composition,
Therefore the optical glass with desired low liquidus temperature can be made with less expensive price.Therefore, change with oxide
Mass ratio (the ZrO of the composition calculated2+Ta2O5+Nb2O5)/(B2O3+SiO2) the upper limit be preferably 2.00, more preferably 1.80, optimum
Elect 1.50 as.
Gd2O3Composition is to improve the refractive index of glass and improve the composition of Abbe number, is in the optical glass of the present invention
Any composition.Especially by making Gd2O3The content of composition is less than 45.0%, more preferably less than 40.0%, is becoming appearance
While easily obtaining the desired optical constant of glass, can suppress owing to excess contains Gd2O3Composition and the vitrification that causes turn
The rising of height (Tg), the devitrification resistance of glass can be improved.It addition, by reducing Gd2O3Composition, can reduce optical glass
Material cost.Accordingly, with respect to the glass gross mass of the composition converted with oxide, Gd2O3The upper content limit of composition is preferably
45.0%, more preferably 40.0%, more preferably 30.0%, most preferably 25.0%.Even if although additionally, not containing
Gd2O3Composition there will not be technical negative effect, but by containing the Gd more than 0%2O3Composition, by reducing glass
Liquidus temperature can improve devitrification resistance further.Accordingly, with respect to the glass gross mass of the composition converted with oxide,
Gd2O3The content lower limit of composition is preferably greater than 0%, more preferably 1.0%, more preferably 2.0%.Here, from permissible
From the viewpoint of being readily available desired optical constant by refractive index and the Abbe number of raising glass, relative to oxygen
The glass gross mass of the composition of compound conversion, Gd2O3The content lower limit of composition is preferably greater than 5.0%, more preferably 5.5%,
It is preferably 6.0%.It addition, from the viewpoint of the devitrification resistance that can further improve glass, Gd2O3The content of composition and La2O3
Ratio (the Gd of the content of composition2O3/La2O3) be preferably more than 0.01 and less than 2.00, more preferably more than 0.03 and 1.70 with
Under, most preferably more than 0.05 and less than 1.50.Such as Gd can be used2O3、GdF3Glass is made to be contained within Deng as raw material
Gd2O3Composition.
Y2O3Composition and Yb2O3Composition is to improve the refractive index of glass, the composition of minimizing dispersion, is the optics glass of the present invention
Any composition in glass.Especially by making Y2O3The content of composition is less than 30.0% and/or makes Yb2O3The content of composition is
Less than 20.0%, the desired optical constant of glass can be readily available, it is possible to improve the devitrification resistance of glass.Therefore,
Relative to the glass gross mass of the composition converted with oxide, Y2O3The upper content limit of composition is respectively preferably 30.0%, more preferably
It is 25.0%, more preferably 20.0%, most preferably 15.0%.Glass accordingly, with respect to the composition converted with oxide
Glass gross mass, Yb2O3The upper content limit of composition is respectively preferably 20.0%, more preferably 15.0%, most preferably 10.0%.Can
To use such as Y2O3、YF3、Yb2O3Glass is made to be contained within Y Deng as raw material2O3Composition and Yb2O3Composition.
In the optical glass of the present invention, Ln2O3(in formula, Ln is the one in the group selecting free La, Gd, Y, Yb composition to composition
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 composition and be more than 30.0%, the refractive index of glass and Abbe number all can be improved, because of
This, can be readily available the glass with desired refractive index and Abbe number.Accordingly, with respect to the group converted with oxide
The glass gross mass become, Ln2O3The lower limit of the quality sum of composition is preferably 30.0%, 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 composition and be less than 75.0%, glass
The liquidus temperature of glass can reduce, and therefore can reduce the devitrification of glass.Glass accordingly, with respect to the composition converted with oxide
Glass gross mass, Ln2O3The upper limit of the quality sum of composition is preferably 75.0%, more preferably 70.0%, more preferably
65.0%, more preferably 60.0%, most preferably 55.0%.
In the optical glass of the present invention, Ta2O5The content of composition and quality and (Ln2O3+ZrO2+Nb2O5+WO3) ratio excellent
Elect less than 0.300 as.Thus, the Ta that material cost is higher in the composition improving refractive index can be reduced2O5The content of composition, because of
This, can make the optical glass with high index of refraction with lower cost.Accordingly, with respect to the composition converted with oxide
Glass gross mass, mass ratio Ta2O5/(Ln2O3+ZrO2+Nb2O5+WO3) the upper limit be preferably 0.300, more preferably 0.280,
It is preferably 0.250.
MgO composition, CaO composition, SrO composition and BaO composition are the regulation refractive index of glass, meltbility, increased devitrification resistance
Composition, is any composition in the optical glass of the present invention.Especially by making, MgO composition, CaO composition and SrO composition are each
From content be 20.0% and/or to make the content of BaO composition be less than 25.0%, by the refraction suppressing these compositions to cause
The reduction of rate can be readily available desired refractive index and can reduce because excess occurs containing these compositions
The devitrification of glass.Accordingly, with respect to the glass gross mass of the composition converted with oxide, MgO composition, CaO composition and SrO become
Respective upper content limit is divided to be preferably 20.0%, more preferably 10.0%, most preferably 5.0%.It addition, relative to oxide
The glass gross mass of composition of conversion, the upper content limit of BaO composition is preferably 25.0%, more preferably 15.0%, 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 glass be contained within MgO composition, CaO composition, SrO composition and BaO composition.
(in formula, R is the one in the group selecting free Mg, Ca, Sr, Ba composition to RO composition in the optical glass of the present invention
Above element) total content be preferably less than 25.0%.Thus, by the decline of the refractive index that suppression is caused by RO composition,
Desired refractive index can be readily available.Accordingly, with respect to the glass gross mass of the composition converted with oxide, RO composition
The upper limit of quality sum be preferably 25.0%, more preferably 15.0%, further preferably less than 12.0%, most preferably less than
10.0%.
Li2O composition, Na2O composition, K2O composition and Cs2O composition is to improve the meltbility of glass, reduction glass transition
The composition of point, is any composition in the optical glass of the present invention.Na among this2O composition, K2O composition and Cs2O composition is also
It it is the composition improving glass devitrification resistance.Especially by making Li2O composition, Na2O composition, K2O composition and Cs2O composition is each
Content be less than 10.0%, can make the refractive index of glass be difficult to decline and the stability of glass can be improved and reduce
The generation of devitrification etc..Accordingly, with respect to the glass gross mass of the composition converted with oxide, Li2O composition, Na2O composition, K2O becomes
Divide and Cs2The respective upper content limit of O composition is preferably 10.0%, more preferably 8.0%, most preferably 5.0%.Can use
Such as Li2CO3、LiNO3、Li2CO3、NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6、Cs2CO3、CsNO3Deng
Make glass be contained within Li as raw material2O composition, Na2O composition, K2O composition and Cs2O composition.
Rn2O composition (in formula, Rn is more than one elements in the group selecting free Li, Na, K, Cs composition) is to improve glass
Meltbility and reduce the composition of devitrification of glass.Here, by making Rn2The total content of O composition is less than 15.0%,
The refractive index that can make glass is difficult to reduce, can improve the stability of glass and reduce the generation of devitrification etc..Accordingly, with respect to
With the glass gross mass of the composition of oxide conversion, Rn2The upper limit of the quality sum of O composition is preferably 15.0%, is more preferably
10.0%, most preferably 5.0%.
In the optical glass of the present invention, quality and (B2O3+SiO2+WO3) and quality and (Ln2O3+ZrO2+Li2O) ratio
It is preferably more than 0.20 and less than 2.00, more preferably more than 0.27 and less than 2.00.It is 0.27 especially by making this ratio
Above, relative to the composition (Ln making devitrification resistance reduce2O3Composition, ZrO2Composition and Li2O composition) content, raising can be made
Composition (the B of devitrification resistance2O3Composition, SiO2Composition and WO3) content increase, therefore can obtain liquidus temperature lower
And it is more difficult to the optical glass of devitrification.On the other hand, by making this ratio be less than 2.00, glass can become prone to comprise work
For improving the Ln of the composition of refractive index and Abbe number2O3Composition, therefore can be readily available desired refractive index and Abbe
Number.Therefore, the mass ratio (B of the composition converted with oxide2O3+SiO2+WO3)/(Ln2O3+ZrO2+Li2O) lower limit is preferably
0.20, more preferably 0.27, more preferably 0.28, most preferably 0.29.It addition, the upper limit of this mass ratio is preferably
2.00, more preferably 1.50, most preferably 1.00.
P2O5Composition is the liquidus temperature having and reducing glass the composition of the effect improving devitrification resistance, is the present invention
Optical glass in any composition.Especially by making P2O5The content of composition is less than 10.0%, can suppress the change of glass
Learn the reduction of durability, particularly resistance to water.Accordingly, with respect to the glass gross mass of the composition converted with oxide, P2O5Composition
Upper content limit be preferably 10.0%, more preferably 8.0%, most preferably 5.0%.Such as Al (PO can be used3)3、Ca
(PO3)2、Ba(PO3)2、BPO4、H3PO4Glass is made to be contained within P Deng as raw material2O5Composition.
GeO2Composition is the composition of the effect with the refractive index of raising glass, raising devitrification resistance, is the light of the present invention
Learn any composition in glass.But, due to GeO2Cost of material high, if therefore its amount can increase production cost at most, by
This offsets by reducing Ta2O5Composition and the effect that obtains.Accordingly, with respect to the glass gross mass of the composition converted with oxide,
GeO2The upper content limit of composition is preferably 10.0%, more preferably 5.0%, most preferably 1.0%.Such as GeO can be used2Deng
Make glass be contained within GeO as raw material2Composition.
ZnO component is reduction glass transition temperature (Tg), improves the composition of chemical durability, is the optics glass of the present invention
Any composition in glass.But, can easily make the devitrification resistance of glass be deteriorated at most if the content of ZnO component is crossed.Therefore, relatively
In the glass gross mass of the composition converted with oxide, the upper content limit of ZnO component is preferably 25.0%, is more preferably
20.0%, more preferably 15.0%, most preferably 10.0%.Even if although additionally, not containing ZnO component and can also obtain
There is the glass of desired characteristic, but by glass transition point can be reduced containing ZnO component, therefore, it can be readily available
It is prone to the optical glass being pressed.Accordingly, with respect to the glass gross mass of the composition converted with oxide, ZnO component
Content lower limit be preferably greater than 0%, more preferably 0.1%, most preferably 1.0%.Such as ZnO, ZnF can be used2In work
Make glass be contained within ZnO component for raw material.
Al2O3Composition and Ga2O3Composition is the one-tenth of the devitrification resistance improving the chemical durability of glass, raising melten glass
Point, it is any composition in the optical glass of the present invention.Especially by making Al2O3Composition and Ga2O3The respective content of composition is
Less than 10.0%, the tendency towards devitrification of glass can be weakened, improve the stability of glass.Accordingly, with respect to convert with oxide
The glass gross mass of composition, Al2O3Composition and Ga2O3The respective upper content limit of composition 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)3In making glass as raw material
Containing Al2O3Composition and Ga2O3Composition.
Bi2O3Composition is to improve refractive index, the composition of reduction glass transition point (Tg), is in the optical glass of the present invention
Any composition.Especially by making Bi2O3The content of composition is less than 20.0%, can suppress the rising of liquidus temperature, because of
This can suppress the reduction of devitrification resistance of glass.It addition, by making Bi2O3The content of composition is less than 20.0%, it is possible to reduce glass
The coloring of glass.Accordingly, with respect to the glass gross mass of the composition converted with oxide, Bi2O3The upper content limit of composition is preferably
20.0%, more preferably 15.0%, most preferably 10.0%.Such as Bi can be used2O3Glass is made to be contained within Deng as raw material
Bi2O3Composition.
TeO2Composition is to improve refractive index, the composition of reduction glass transition point (Tg), is in the optical glass of the present invention
Any composition.But, it is former that the fusion tank formed by platinum in the part contacted with melten glass with platinum crucible carrys out melten glass
During material, TeO2There is the problem with platinum alloy.Accordingly, with respect to the glass gross mass of the composition converted with oxide, TeO2Become
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 glass be contained within TeO2Composition.
SnO2Composition is to reduce to dissolve the oxidation of glass and make to dissolve glass clarifying, and makes the transmission that light irradiates by glass
Rate is difficult to the composition being deteriorated, and is any composition in the optical glass of the present invention.Especially by making SnO2The content of composition is
Less than 1.0%, the coloring of glass, the devitrification of glass by dissolving the reduction of glass and cause can be made to be difficult to produce.It addition, by
In SnO2Composition is lowered with the alloying of dissolution equipment (noble metal such as particularly Pt), therefore can seek the length of dissolution equipment
Life-span.Accordingly, with respect to the glass gross mass of the composition converted with oxide, SnO2The upper content limit of composition is respectively preferably
1.0%, more preferably 0.7%, most preferably 0.5%.Such as SnO, SnO can be used2、SnF2、SnF4Make Deng as raw material
Glass is contained within SnO2Composition.
Sb2O3Composition is by the composition of melten glass deaeration, is any composition in the optical glass of the present invention.If Sb2O3
Measured the absorbance in the short wavelength region that can make visible region at most to be deteriorated.Accordingly, with respect to the group converted with oxide
The glass gross mass become, Sb2O3The upper content limit of composition is preferably 1.0%, more preferably 0.7%, most preferably 0.5%.Permissible
Use such as Sb2O3、Sb2O5、Na2H2Sb2O7·5H2O etc. make glass be contained within Sb as raw material2O3Composition.
Additionally, make glass clarifying, the composition of deaeration is not limited to above-mentioned Sb2O3Composition, it is possible to use at glass manufacture
Known clarifier, deaeration agent or they are applied in combination in field.
About the composition that should not contain
Then, the composition that should not contain in the optical glass of the present invention and the composition that do not preferably comprises are said
Bright.
Other composition can be added in the range of the characteristic of glass not damaging the present application as required.
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
Even if composition has also can make glass coloration, to visible ray in the case of each containing on a small quantity with independent or compound form
The specific wavelength in region produces the character absorbed, the most particularly in using the optical glass of wavelength of visible region, excellent
Choosing does not the most comprise these elements.
Further, since leaded thing and the As such as PbO2O3It is the composition that environmental pressure is high Deng arsenide, it is therefore desirable that base
Do not contain on Ben, i.e. remove and never contain these elements beyond being inevitably mixed into.
And then, each composition of Th, Cd, Tl, Os, Be and Se has in recent years and controls to make as harmful chemical substance
Tendency, not only the process in the manufacturing process of glass, after manufacturing procedure or even commercialization is required for environmental cure
The measure of aspect.Therefore, in the case of paying attention to impact environmentally, preferably substantially free from there being these elements.
The composition of the glass composition of the present invention is with the matter of the glass gross mass relative to the composition converted with oxide
Amount % represents, because of rather than directly represent with the recording mode of mole %, but calculate with the oxide composition that converts,
Present in the glass composition of all characteristics required by meeting in the present invention, the composition of each composition represents with a mole %, substantially
For values below.
The B of 2.0～55.0 moles of %2O3Composition and
The La of 5.0～35.0 moles of %2O3Composition and
The Ta of 0～10.0 mole of %2O5Composition and/or
The TiO of 0～30.0 mole of %2Composition and/or
The Nb of 0～15.0 mole of %2O5Composition and/or
The WO of 0～30.0 mole of %3Composition and/or
The SiO of 0～50.0 mole of %2Composition and/or
The ZrO of 0～18.0 mole of %2Composition and/or
The Gd of 0～25.0 mole of %2O3Composition and/or
The Y of 0～20.0 mole of %2O3Composition and/or
The Yb of 0～10.0 mole of %2O3Composition and/or
The MgO composition of 0～50.0 mole of % and/or
The CaO composition of 0～40.0 mole of % and/or
The SrO composition of 0～30.0 mole of % and/or
The BaO composition of 0～35.0 mole of % and/or
The Li of 0～30.0 mole of %2O composition and/or
The Na of 0～25.0 mole of %2O composition and/or
The K of 0～20.0 mole of %2O composition and/or
The Cs of 0～10.0 mole of %2O composition and/or
The P of 0～15.0 mole of %2O5Composition and/or
The GeO of 0～10.0 mole of %2Composition and/or
The ZnO component of 0～50.0 mole of % and/or
The Al of 0～15.0 mole of %2O3Composition and/or
The Ga of 0～5.0 mole of %2O3Composition and/or
The Bi of 0～10.0 mole of %2O3Composition and/or
The TeO of 0～25.0 mole of %2Composition and/or
0～0.5 mole of %Sb2O3Composition
Manufacture method
The optical glass of the present invention such as can make as follows: i.e., uniformly mixes above-mentioned raw materials so that each composition is in regulation
Content range in, will make mixture put into platinum crucible, according to glass composition melted complexity and exist with electric furnace
Melt 2～5 hours within the temperature range of 1100～1500 DEG C, after stirring homogenizes, be reduced to proper temperature and be then cast in
Mould, Slow cooling makes.
Physical property
The optical glass of the present invention needs have high index of refraction (nd) and low dispersion.The particularly optical glass of the present invention
Refractive index (nd) lower limit be preferably 1.75, more preferably 1.80, more preferably 1.82, most preferably 1.85.It addition, this
Abbe number (the ν of the optical glass of inventiond) lower limit be preferably 30, more preferably 35, more preferably 37, most preferably
39, its upper limit is preferably 50, more preferably 47, most preferably 45.Thus, the degree of freedom of optical design is relatively big, even if further
The slimming seeking element can also obtain bigger optical diffraction amount.Additionally, the refractive index (n of the optical glass of the present inventiond)
The upper limit mostly is such as less than 2.00, is more specifically less than 1.98, is more specifically less than 1.95.
Even if it addition, the optical glass of the present invention is at Ta2O5Composition poor in the case of be also required to high devitrification resistance.
The optical glass of the present invention particularly preferably has the low liquidus temperature of less than 1300 DEG C.More specifically, the optics of the present invention
The upper limit of the liquidus temperature of glass is preferably 1300 DEG C, more preferably 1280 DEG C, most preferably 1250 DEG C.Thus, though
Flow out melten glass under lower temperature, owing to decreasing the crystallization of made glass, therefore can improve by molten condition
Form devitrification resistance during glass, the impact of optical characteristics on the optical element using glass can be alleviated.Further, since open up
The wide temperature range that can stably form glass, even if the melting temperature therefore reducing glass can also make glass molding, can
The energy consumed during with suppression glass molding.On the other hand, the lower limit of the liquidus temperature of the optical glass of the present invention is not had
It is particularly limited to, but the liquidus temperature of the glass obtained by the present invention is many more than substantially 500 DEG C, specifically 550 DEG C
Above, it is more than 600 DEG C more specifically.Additionally, the what is called " liquidus temperature " in this specification represents: to capacity
The platinum crucible of 50ml puts into the cullet shape glass specimen of 30cc, makes it be in platinum crucible at 1350 DEG C the most molten
Melt state, be cooled to set point of temperature and keep 12 hours, being taken out to outside stove, the most immediately sight glass surface and glass
In with or without crystal, and the minimum temperature to crystal unconfirmed.Here set point of temperature represent till 1300 DEG C～1160 DEG C with
20 DEG C of temperature set for unit.
It addition, the optical glass of the present invention preferably colours few.Particularly the optical glass of the present invention is with the absorbance of glass
When 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.It addition, the wavelength (λ of display 5% spectral-transmission favtor5) be below 400nm, be more preferably
Below 380nm, most preferably below 360nm.Thus, the absorption edge of glass is positioned at the vicinity of ultraviolet region, can improve visible
The transparency of the glass in light region, therefore, it can preferably using this optical glass as the materials'use of the optical elements such as lens.
It addition, the optical glass of the present invention preferably has low partial dispersion ratio (θ g, F).More specifically, the present invention
The partial dispersion ratio (θ g, F) of optical glass and Abbe number (νd(-2.50 × 10 are met between)-3×νd+ 0.6571) (θ g, F)
≦(-2.50×10-3×νd+ 0.6971) relation.Thus, it is possible to obtain the optical glass that partial dispersion ratio (θ g, F) is little, because of
This can reduce the chromatic aberration of the optical element formed by this optical glass.The partial dispersion ratio of the optical glass of the present invention (θ g,
F) lower limit is preferably (-2.50 × 10-3×νd+ 0.6571), more preferably (-2.50 × 10-3×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 the optical glass of the present invention is excellent
Elect (-2.50 × 10 as-3×νd+ 0.6971), more preferably (-2.50 × 10-3×νd+ 0.6921), most preferably (-2.50 ×
10-3×νd+0.6871)。
Glass forming body and optical element
Can use such as attrition process method or, the side of the compression molding such as compressing, the precision press molding of reheating
Method, is made glass forming body by the optical glass made.I.e., it is possible to optical glass to be carried out the machining such as grinding and grinding
Make glass forming body；Or it is compressing the preform made by optical glass can be carried out reheating, then grinds
Mill processing makes glass forming body；Or the preform that can make being ground processing, utilize known float glass process
The preform of the molding such as molding carries out precision press molding, thus makes glass forming body.Additionally, make glass forming body
Method is not limited to these methods.
As it has been 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 the optical element such as lens, prism.Thus, big owing to footpath can be formed glass
Molded body, therefore can seek optical element and maximize, and realize high-resolution when for the optical instrument such as photographing unit, projector
And high-precision imaging characteristic and projection property.
Embodiment
By embodiments of the 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 glassd), Abbe number (νd), partial dispersion ratio (θ g, F), liquidus temperature and
Wavelength (the λ of display 5% and 70% spectral-transmission favtor5λ70) result be shown in table 1～table 38.Additionally, below example is only
To be illustrated as purpose, the present invention is not limited to these embodiments.
Embodiments of the invention (No.1～No.285), reference example (No.A～No.B) and comparative example (No.A～No.B)
In glass be following making: as the raw material of each composition, selected respective oxide, hydroxide, carbonate,
Nitrate, fluoride, Metaphosphoric acid compound etc. are generally used for the high-purity raw of optical glass, shown in table 1～table 38
The proportion of composing of each embodiment carries out weighing, uniformly puts into platinum crucible after mixing, according to the melted complexity of glass composition
And after melting 2～5 hours within the temperature range of 1100～1500 DEG C with electric furnace, stirring homogenizes, and is then cast in mould
Deng, Slow cooling makes glass.
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 the Abbe number (ν tried to achieved) and the value of partial dispersion ratio (θ g, F), obtain
Relational expression (θ g, F)=-a × νd+ b is intercept b when 0.0025 as slope a.Here, refractive index (nd), Abbe number (νd), with
And partial dispersion ratio (θ g, F) is to be measured the glass cooling rate of Slow cooling being set as-25 DEG C/hr and obtain
And obtain.
It addition, according to Japanese Optical nitre industry meeting standard JOGIS02, to embodiment (No.1～No.285), reference example
The absorbance of the glass of (No.A～No.B) and comparative example (No.A～No.B) is measured.Additionally, in the present invention, pass through
The absorbance measuring glass obtains presence or absence and the degree of glass coloration.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(absorbance is wavelength when 5%) with
And λ70(absorbance is wavelength when 70%).
It 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: put into the glass specimen of 30cc cullet shape in the platinum crucible of capacity 50ml,
Make it become molten condition in platinum crucible completely at 1350 DEG C, be cooled to till 1300 DEG C～1160 DEG C in units of 20 DEG C
Arbitrary temperature of setting also keeps 12 hours, be fetched into outside stove after cooling immediately in sight glass surface and glass with or without crystalline substance
Body, obtain the minimum temperature to crystal unconfirmed.
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 table 1～table 38, the liquidus temperature of the optical glass in embodiments of the invention (No.1～No.285)
Be less than 1300 DEG C, be more specifically less than 1260 DEG C, in desired scope.Hence it is evident that it can be seen that this
The liquidus temperature of the bright optical glass in embodiment is low.Additionally, reference example (No.A～No.B) and comparative example (No.A～
No.B) all there is devitrification, therefore estimate its liquidus temperature high.
It addition, the λ of the optical glass in embodiments of the invention70(absorbance is wavelength when 70%) be 420nm with
Under, be more specifically below 405nm.It addition, the λ of the optical glass in embodiments of the invention5(when absorbance is 5%
Wavelength) it is below 400nm, more specifically for below 360nm.Hence it is evident that it can be seen that in embodiments of the invention
Optical glass is difficult to colour.
It addition, the refractive index (n of the optical glass in embodiments of the inventiond) be more than 1.75, be more specifically
More than 1.86, and this refractive index (nd) be less than 2.00, be more specifically less than 1.97, in desired scope.
It addition, the Abbe number (ν of the optical glass in embodiments of the inventiond) it is more than 30, and this Abbe number (νd)
It is less than 50, is more specifically less than 42, in desired scope.
It addition, the partial dispersion ratio (θ g, F) of the optical glass in embodiments of the invention is (-2.50 × 10-3×νd+
0.6571) more than, be more specifically (-2.50 × 10-3×νd+ 0.6665) more than.On the other hand, embodiments of the invention
The partial dispersion of optical glass is than for (-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 it can be seen that the refractive index (n of optical glass in embodiments of the inventiond) and Abbe number (νd)
Desired scope is interior and can make at a low price, devitrification resistance is high and colour few.
And then, use the optical glass in embodiments of the invention to form glass blocks, this glass blocks is carried out grinding and grinds
Mill, thus it is processed as the shape of lens and prism.It is as a result, it is possible to be stably processed as the shape of various lens and prism.
Above, the present invention is described in detail being illustrated as purpose, but the present embodiment is only to be illustrated as purpose,
It is appreciated that those skilled in the art can carry out many changes without departing from the spirit and scope of the present invention.
Claims (21)
1. an optical glass, relative to the glass gross mass of the composition converted with oxide, in terms of quality %, containing 1.0～
The B of 30.0%2O3Composition and 10.0～the La of 55.0%2O3Composition, and Ta2O5The content of composition is less than 20.0%.
Optical glass the most according to claim 1, in the composition converted with oxide, containing selecting free TiO2Composition,
Nb2O5Composition and WO3Become more than one compositions in the group being grouped into.
Optical glass the most according to claim 2, relative to the glass gross mass of the composition converted with oxide, choosing is freely
TiO2Composition, Nb2O5Composition and WO3Become the content sum of more than one compositions in the group that is grouped into be more than 0.5% and
Less than 40.0%.
Optical glass the most according to claim 2, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, contains:
0～the TiO of 20.0%2Composition and/or
0～the Nb of 20.0%2O5Composition and/or
0～the WO of 25.0%3Composition.
Optical glass the most according to claim 1, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, possibly together with following each composition:
0～the SiO of 20.0%2Composition and/or
0～the ZrO of 12.0%2Composition.
Optical glass the most according to claim 1, relative to the glass gross mass of the composition converted with oxide, B2O3Become
Divide and SiO2The content sum of composition is less than 25.0%.
Optical glass the most according to claim 1, with the mass ratio (ZrO of the composition of oxide conversion2+Ta2O5+Nb2O5)/
(B2O3+SiO2) it is less than 2.00.
Optical glass the most according to claim 1, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, possibly together with following each composition:
0～the Gd of 45.0%2O3Composition and/or
0～the Y of 30.0%2O3Composition and/or
0～the Yb of 20.0%2O3Composition.
Optical glass the most according to claim 1, relative to the glass gross mass of the composition converted with oxide, Ln2O3Become
Point quality and be more than 30.0% and less than 75.0%, in formula, Ln be select free La, Gd, Y, Yb form group in one
Above element.
Optical glass the most according to claim 9, relative to the glass gross mass of the composition converted with oxide, Ln2O3
The quality of composition and more than 40.0%, in formula, Ln is more than one elements in the group selecting free La, Gd, Y, Yb to form.
11. optical glass according to claim 1, with the mass ratio Ta of the composition of oxide conversion2O5/(Ln2O3+ZrO2+
Nb2O5+WO3) it is less than 0.300, in formula, Ln is more than one elements in the group selecting free La, Gd, Y, Yb composition.
12. optical glass according to claim 1, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, possibly together with following each composition:
0～the MgO composition of 20.0% and/or
0～the CaO composition of 20.0% and/or
0～the SrO composition of 20.0% and/or
0～the BaO composition of 25.0%.
13. optical glass according to claim 12, relative to the glass gross mass of the composition converted with oxide, RO becomes
Point quality and be less than 25.0%, in formula, R be select free Mg, Ca, Sr, Ba form group in more than one elements.
14. optical glass according to claim 1, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, possibly together with following each composition:
0～the Li of 10.0%2O composition and/or
0～the Na of 10.0%2O composition and/or
0～the K of 10.0%2O composition and/or
0～the Cs of 10.0%2O composition.
15. optical glass according to claim 14, relative to the glass gross mass of the composition converted with oxide, Rn2O
The quality of composition and be less than 15.0%, in formula, Rn is more than one elements in the group selecting free Li, Na, K, Cs to form.
16. optical glass according to claim 1, with the mass ratio (B of the composition of oxide conversion2O3+SiO2+WO3)/
(Ln2O3+ZrO2+Li2O) it is more than 0.20 and less than 2.00.
17. optical glass according to claim 1, relative to the glass gross mass of the composition converted with oxide, with matter
Amount % meter, possibly together with following each composition:
0～the P of 10.0%2O5Composition and/or
0～the GeO of 10.0%2Composition and/or
0～the ZnO component of 25.0% and/or
0～the Al of 10.0%2O3Composition and/or
0～the Ga of 10.0%2O3Composition and/or
0～the Bi of 20.0%2O3Composition and/or
0～the TeO of 20.0%2Composition and/or
0～the SnO of 1.0%2Composition and/or
0～the Sb of 1.0%2O3Composition.
18. optical glass according to claim 1, it has the refractive index (n of more than 1.75d) and have more than 30 and 50
Following Abbe number (νd)。
19. optical glass according to claim 1, it has the liquidus temperature of less than 1300 DEG C.
20. 1 kinds of optical elements, it is with the optical glass described in any one in claim 1～19 as mother metal.
21. 1 kinds of optical instruments, it possesses the optical element described in claim 20.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-186195 | 2010-08-23 | ||
| JP2010186195 | 2010-08-23 | ||
| JP2011100215 | 2011-04-27 | ||
| JP2011-100215 | 2011-04-27 | ||
| CN2011102438229A CN102372430A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102438229A Division CN102372430A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
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| CN106277753A true CN106277753A (en) | 2017-01-04 |
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| CN201610576353.5A Pending CN106277753A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
| CN2011102438229A Pending CN102372430A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
| CN201711222708.1A Pending CN107986616A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102438229A Pending CN102372430A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
| CN201711222708.1A Pending CN107986616A (en) | 2010-08-23 | 2011-08-23 | Optical glass and optical element |
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| Country | Link |
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| JP (1) | JP5827067B2 (en) |
| CN (3) | CN106277753A (en) |
| TW (1) | TWI585056B (en) |
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Also Published As
| Publication number | Publication date |
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| TW201219333A (en) | 2012-05-16 |
| TWI585056B (en) | 2017-06-01 |
| JP5827067B2 (en) | 2015-12-02 |
| CN107986616A (en) | 2018-05-04 |
| JP2012236754A (en) | 2012-12-06 |
| CN102372430A (en) | 2012-03-14 |
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