CN110407458A - Optical glass and optical element - Google Patents

Optical glass and optical element Download PDF

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Publication number
CN110407458A
CN110407458A CN201910328959.0A CN201910328959A CN110407458A CN 110407458 A CN110407458 A CN 110407458A CN 201910328959 A CN201910328959 A CN 201910328959A CN 110407458 A CN110407458 A CN 110407458A
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China
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content
glass
mass
optical
optical glass
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CN110407458B (en
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桑谷俊伍
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Hoya Corp
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Hoya Corp
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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

Abstract

The present invention provides a kind of optical glass and optical element, and above-mentioned optical glass has desired optical constant and specific gravity is smaller, and above-mentioned optical element includes above-mentioned optical glass.The Abbe number ν d of above-mentioned optical glass is more than 39 and is 45 or less, B2O3Content be 15~35 mass %, La2O3Content be the contents of 35~50 mass %, ZnO be 5~17 mass %, ZrO2Content be 3~7.5 mass %, SiO2Content be more than 0 mass % and for 5 mass % or less, TiO2Content be more than 0 mass % and for 12 mass % or less, Al2O3Content be more than 0 mass % and for 5 mass % or less, Gd2O3Content be the content of 0~5 mass %, BaO be 0~3 mass %, Ta2O5Content be 0~2.5 mass %, Nb2O5And WO3Total content [Nb2O5+WO3] it is 0~6 mass %.

Description

Optical glass and optical element
Technical field
The present invention relates to optical glass and optical element.
Background technique
In patent document 1, disclosing one kind makes Nb2O5And WO3The usage amount of the high glass ingredient of these costs of material drops Low optical glass.It is 39~45 in Abbe number ν d but in the optical glass disclosed in the embodiment of patent document 1 It discloses in the optical glass of specific gravity, uses Y mostly2O3The relatively high ingredient of this cost of material.In addition, disclosed Ah In the optical glass that shellfish number ν d is 39~45, largely having used BaO, this becomes the ingredient for the reason of specific gravity increases.Therefore, the phase It hopes a kind of with desired optical constant and specific gravity is small, the furthermore low optical glass of cost of material.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2017-88482 bulletin.
Summary of the invention
Problems to be solved by the invention
Optical element mounted for the optical system of auto-focusing mode, when in order to reduce driving automatic focusing function Power consumption, it is desirable that lighting.If can reduce the specific gravity of glass, the weight of the optical elements such as lens can be reduced.
Therefore, it is an object of that present invention to provide with desired optical constant, the lesser optical glass of specific gravity and comprising The optical element of above-mentioned optical glass.
The solution to the problem
The inventors of the present invention have made intensive studies to achieve the goals above, as a result, it has been found that, glass is constituted by adjusting The containing ratios of various glass constituents (hereinafter referred to as " glass ingredient ") be based on this opinion so that the purpose can be realized And complete the present invention.
That is, main contents of the invention are as described below.
(1) a kind of optical glass,
Abbe number ν d be more than 39 and for 45 hereinafter,
B2O3Content be 15~35 mass %,
La2O3Content be 35~50 mass %,
The content of ZnO is 5~17 mass %,
ZrO2Content be 3~7.5 mass %,
SiO2Content be more than 0 mass % and for 5 mass % hereinafter,
TiO2Content be more than 0 mass % and for 12 mass % hereinafter,
Al2O3Content be more than 0 mass % and for 5 mass % hereinafter,
Gd2O3Content be 0~5 mass %,
The content of BaO is 0~3 mass %,
Ta2O5Content be 0~2.5 mass %,
Nb2O5And WO3Total content [Nb2O5+WO3] it is 0~6 mass %.
(2) a kind of optical element includes optical glass described in above-mentioned (1).
Invention effect
In accordance with the invention it is possible to provide with desired optical constant, the lesser optical glass of specific gravity and comprising above-mentioned The optical element of optical glass.
Specific embodiment
Hereinafter, embodiments of the present invention will be described.In addition, in the present invention and this specification, optical glass Glass composition is then indicated unless otherwise specified with oxide benchmark.Here, " glass of oxide benchmark forms " refers to, lead to Cross be scaled glass raw material melting when be all decomposed and in optical glass in the form of an oxide and existing ingredient to Obtained glass composition, the statement of each glass ingredient are denoted as SiO by convention2、TiO2Deng.The content of glass ingredient contains with total Amount is then unless otherwise specified quality criteria, and " % " refers to " quality % ".
The content of glass ingredient can utilize well known method such as Inductively coupled plasma atomic emission sperctrometry The methods of method (ICP-AES), inductivity coupled plasma mass spectrometry analytic approach (ICP-MS) are quantified.In addition, in this specification In the present invention, the content of constituent refers to for 0% does not include this composition ingredient substantially, allows with inevitable impurity Level includes the ingredient.
In addition, in the present specification, refractive index refers to the d line (wavelength 587.56nm) of helium unless otherwise specified Refractive index nd.
Abbe number ν d is used as the value for indicating property relevant to dispersion, is expressed from the next.Here, nF is blue hydrogen F line (wavelength 486.13nm) refractive index, nC is the refractive index of the C line (656.27nm) of red hydrogen.
ν d=(nd-1)/(nF-nC)
The optical glass of present embodiment is characterized in that,
Abbe number ν d be more than 39 and for 45 hereinafter,
B2O3Content be 15~35%,
La2O3Content be 35~50%,
The content of ZnO is 5~17%,
ZrO2Content be 3~7.5%,
SiO2Content be more than 0% and for 5% hereinafter,
TiO2Content be more than 0% and for 12% hereinafter,
Al2O3Content be more than 0% and for 5% hereinafter,
Gd2O3Content be 0~5%,
The content of BaO is 0~3%,
Ta2O5Content be 0~2.5%,
Nb2O5And WO3Total content [Nb2O5+WO3] it is 0~6%.
In the optical glass of present embodiment, B2O3Content be 15~35%.B2O3The upper limit of content be preferably 33%, and then successively more preferable 31%, 30%, 29%.In addition, B2O3Content lower limit, preferably 17%, and then successively more It is preferred that 19%, 20%, 21%.
Work as B2O3Content it is excessive when, refractive index nd decline, be unable to get the optics glass with desired optical constant Glass.In addition, working as B2O3Content it is very few when, the thermal stability of glass is possible to decline.
In the optical glass of present embodiment, La2O3Content be 35~50%.La2O3The upper limit of content be preferably 49%, and then successively more preferable 48%, 47%, 46%.In addition, La2O3The lower limit of content be preferably 36%, and then successively more It is preferred that 37%, 38%, 39%.
Work as La2O3Content it is excessive when, it is possible to glass thermal stability decline, specific gravity increase.In addition, working as La2O3Contain When measuring very few, refractive index nd decline is unable to get the optical glass with desired optical constant.
In the optical glass of present embodiment, the content of ZnO is 5~17%.The upper limit of the content of ZnO is preferably 16.5%, and then successively more preferable 16%, 15.5%, 15%.In addition, the lower limit of the content of ZnO is preferably 7%, and then successively More preferable 8%, 9%, 10%.
When the content of ZnO is excessive, the thermal stability of glass is possible to decline.In addition, when the content of ZnO is very few, In The dissolution residual of glass raw material is easy to produce when the melting of glass.
In the optical glass of present embodiment, ZrO2Content be 3~7.5%.ZrO2The upper limit of content be preferably 7%, and then successively more preferable 6.8%, 6.6%, 6.5%.In addition, ZrO2The lower limit of content be preferably 3.5%, and then successively More preferable 4%, 4.3%, 4.5%.
Work as ZrO2Content it is excessive when, specific gravity is possible to increase.
In the optical glass of present embodiment, SiO2Content be more than 0% and for 5% or less.SiO2Content the upper limit Preferably 4.7%, and then successively more preferable 4.4%, 4.2%, 4%.In addition, SiO2The lower limit of content be preferably 0.5%, into And successively more preferable 1%, 1.3%, 1.5%.
Work as SiO2Content it is excessive when, refractive index nd decline, be unable to get the optics glass with desired optical constant Glass.In addition, being easy to produce the dissolution residual of glass raw material in the melting of glass.Work as SiO2Content it is very few when, the heat of glass Stability is possible to decline.
In the optical glass of present embodiment, TiO2Content be more than 0% and for 12% or less.TiO2Content it is upper Limit preferably 11%, and then successively more preferable 10%, 9%, 8%.In addition, TiO2The lower limit of content be preferably 1%, Jin Eryi Secondary more preferable 2%, 3%, 4%.
Work as TiO2Content it is excessive when, glass coloration and transmitance is possible to decline.In addition, working as TiO2Content it is very few when, Refractive index nd decline, is unable to get the optical glass with desired optical constant.In turn, in TiO2Poor situation Under, in order to obtain with the optical glass of desired optical constant, need to increase Nb2O5Or WO3These other high refractive indexes at The content divided, as a result cost of material may increase.
In the optical glass of present embodiment, Al2O3Content be more than 0% and for 5% or less.Al2O3Content it is upper Limit preferably 4.5%, and then successively more preferable 4%, 3.5%, 3%.In addition, Al2O3The lower limit of content be preferably 0.2%, into And successively more preferable 0.4%, 0.5%, 0.6%.
Work as Al2O3Content it is excessive when, refractive index nd decline, be unable to get the optics glass with desired optical constant Glass.It can be by the inclusion of Al2O3And improve acid resistance.
In the optical glass of present embodiment, Gd2O3Content be 0~5%.Gd2O3The upper limit of content be preferably 4%, and then successively more preferable 3%, 2%, 1%.In addition, Gd2O3Content it is preferably few, content can be 0%.
Work as Gd2O3Content it is excessive when, specific gravity increase, furthermore cost of material may increase.
In the optical glass of present embodiment, the content of BaO is 0~3%.The upper limit of the content of BaO is preferably 2.5%, and then successively more preferable 2%, 1.5%, 1%.The lower limit of the content of BaO is preferably 0%.The content of BaO can be 0%.
When the content of BaO is excessive, specific gravity is possible to increase.
In the optical glass of present embodiment, Ta2O5Content be 0~2.5%.Ta2O5The upper limit of content be preferably 2%, and then successively more preferable 1.5%, 1%, 0.5%.In addition, Ta2O5Content it is preferably few, content can be 0%.
Work as Ta2O5Content it is excessive when, cost of material may increase.
In the optical glass of present embodiment, Nb2O5And WO3Total content [Nb2O5+WO3] it is 0~6%.It is total to contain Measure [Nb2O5+WO3] the upper limit be preferably 5%, and then successively more preferable 4%, 3.5%, 3%.In addition, total content [Nb2O5+ WO3] preferably few, it can be 0%.
As total content [Nb2O5+WO3] it is excessive when, specific gravity increases, and cost of material may increase.
The content to the glass ingredient than that described above in the optical glass of present embodiment and ratio carry out below Narration in detail.
In the optical glass of present embodiment, SiO2And B2O3Total content [SiO2+B2O3] the upper limit be preferably 40%, and then successively more preferable 38%, 36%, 35%.In addition, total content [SiO2+B2O3] the lower limit of content be preferably 15%, and then successively it is more preferably 20%, 23%, 25%.By by total content [SiO2+B2O3] it is set as above range, thus The thermal stability of glass can be improved, and obtain desired optical constant.
In the optical glass of present embodiment, P2O5The upper limit of content be preferably 5%, and then successively more preferable 3%, 2%, 1%.P2O5Content can be 0%.By by P2O5Content be set as above range, so as to improve the heat of glass Stability.
In the optical glass of present embodiment, Nb2O5The upper limit of content be preferably 6%, and then successively more preferable 5%, 4%, 3%.In addition, Nb2O5Content it is preferably few, lower limit is preferably 0%.Nb2O5Content may be 0%.Passing through will Nb2O5Content be set as above range, so as to reduce the coloring of glass, and be able to suppress specific gravity increase, inhibit raw material The increase of cost.
In the optical glass of present embodiment, WO3The upper limit of content be preferably 6%, and then be successively more preferably 5%, 4%, 3%.WO3Content it is preferably few, lower limit is preferably 0%.WO3Content can be 0%.By by WO3Content The upper limit be set as above range, so as to reduce the coloring of glass, and be able to suppress specific gravity increase, inhibit cost of material Increase.
In the optical glass of present embodiment, TiO2、Nb2O5And WO3Total content relative to TiO2Content matter Amount is than [(TiO2+Nb2O5+WO3)/TiO2] lower limit be preferably 1.In addition, mass ratio [(TiO2+Nb2O5+WO3)/TiO2] contain The upper limit of amount is preferably 3, and then successively more preferable 2.5,2.2,2.By by mass ratio [(TiO2+Nb2O5+WO3)/TiO2] be set as Above range realizes desired optical constant so as to inhibit the increase of cost of material.
In the optical glass of present embodiment, Bi2O3The upper limit of content be preferably 5%, and then successively more preferable 4%, 3.5%, 3%.In addition, Bi2O3The lower limit of content be preferably 0%.Bi2O3Content can be 0%.By by Bi2O3Contain Amount is set as above range, so as to improve the thermal stability of glass and reduce specific gravity.
In the optical glass of present embodiment, TiO2、Nb2O5、WO3、ZrO2、Ta2O5、Bi2O3Total content relative to SiO2、B2O3Total content mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+Bi2O3)/(SiO2+B2O3)] the upper limit it is excellent It is selected as 0.65, and then successively more preferable 0.60,0.55,0.50.In addition, mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+ Bi2O3)/(SiO2+B2O3)] lower limit be preferably 0.20, and then successively more preferable 0.25,0.30,0.35.By by mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+Bi2O3)/(SiO2+B2O3)] it is set as above range, so as to more easily inhibit The increase of specific gravity and obtain desired optical constant.
In the optical glass of present embodiment, Li2The upper limit of the content of O is preferably 5%, and then successively more preferable 3%, 2%, 1%.Li2The lower limit of the content of O is preferably 0%.Li2The content of O can be 0%.
In the optical glass of present embodiment, Na2The upper limit of the content of O is preferably 5%, and then successively more preferable 3%, 2%, 1%.Na2The lower limit of the content of O is preferably 0%.Na2The content of O can be 0%.
In the optical glass of present embodiment, K2The upper limit of the content of O is preferably 5%, and then successively more preferable 3%, 2%, 1%.K2The lower limit of the content of O is preferably 0%.K2The content of O can be 0%.
In the optical glass of present embodiment, Li2O、Na2O and K2Total content [Li of O2O+Na2O+K2O] the upper limit Preferably 5%, and then successively more preferable 4%, 3%, 2%.Total content [Li2O+Na2O+K2O] the lower limit of content be preferably 0%.Total content [Li2O+Na2O+K2O] it can be 0%.
Li2O、Na2O and K2Although O has the function of the thermal stability for reducing liquidus temperature, improving glass, work as them Content it is excessive when, chemical durability, weatherability reduce.Therefore, Li2O、Na2O and K2Each content of O and the total of them contain Amount is respectively preferably above range.
In the optical glass of present embodiment, Cs2The upper limit of the content of O is preferably 5%, and then successively more preferable 3%, 1%, 0.5%.Cs2The lower limit of the content of O is preferably 0%.
Cs2O has the function of improving the thermal stability of glass, chemical durability, weather-proof but when their content is excessive Property reduce.Therefore, Cs2Each content of O is preferably above range.
In the optical glass of present embodiment, the upper limit of the content of MgO is preferably 10%, and then successively more preferable 7%, 4%, 2%.In addition, the lower limit of the content of MgO is preferably 0%.The content of MgO can be 0%.
In the optical glass of present embodiment, the upper limit of the content of CaO is preferably 10%, and then successively more preferable 8%, 6%, 5%.In addition, the lower limit of the content of CaO is preferably 0.2%, and then successively more preferable 0.3%, 0.4%, 0.5%.CaO's Content can be 0%.
In the optical glass of present embodiment, the upper limit of the content of SrO is preferably 10%, and then successively more preferable 7%, 4%, 2%.In addition, the lower limit of the content of SrO is preferably 0%.The content of SrO can be 0%.
MgO, CaO, SrO are the glass ingredients improve with the thermal stability of glass and devitrification resistance.However, When the content of these glass ingredients is excessive, specific gravity increases, and high dispersivity is impaired, and the thermal stability and devitrification resistance of glass It reduces.Therefore, each content of these glass ingredients is respectively preferably above range.
In the optical glass of present embodiment, total content [MgO+CaO+SrO+BaO] of MgO, CaO, SrO and BaO The upper limit be preferably 10%, and then successively more preferable 8%, 6%, 5%.In addition, under total content [MgO+CaO+SrO+BaO] Limit preferably 0%.Total content [MgO+CaO+SrO+BaO] can be 0%.
By the way that total content [MgO+CaO+SrO+BaO] is set as above range, so as to not interfering high dispersion and Maintain chemical durability and thermal stability.
In the optical glass of present embodiment, Y2O3The upper limit of content be preferably 5%, and then successively more preferable 4%, 3.5%, 3%.In addition, Y2O3Content it is preferably few, content can be 0%.
Work as Y2O3Content it is excessive when glass thermal stability reduce, glass becomes easy devitrification during manufacturing.Therefore, from From the perspective of the reduction for inhibiting the thermal stability of glass, preferably Y2O3Content be above range.
In the optical glass of present embodiment, TiO2、Nb2O5、WO3、ZrO2、Ta2O5、Bi2O3、La2O3、Gd2O3、Y2O3 Total content relative to SiO2、B2O3Total content mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+Bi2O3+La2O3 +Gd2O3+Y2O3)/(SiO2+B2O3)] the upper limit be preferably 2.3, and then successively more preferable 2.2,2.1,2.0.In addition, mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+Bi2O3+La2O3+Gd2O3+Y2O3)/(SiO2+B2O3)] lower limit be preferably 1.5, into And successively more preferable 1.6,1.7,1.8.By by mass ratio [(TiO2+Nb2O5+WO3+ZrO2+Ta2O5+Bi2O3+La2O3+Gd2O3 +Y2O3)/(SiO2+B2O3)] it is set as above range, so as to more easily inhibit the increase of specific gravity and obtain desired light Learn constant.
In the optical glass of present embodiment, Sc2O3Content be preferably 2% or less.In addition, Sc2O3Content under Limit preferably 0%.
In the optical glass of present embodiment, HfO2Content be preferably 2% or less.In addition, HfO2Content lower limit Preferably 0%, and then successively more preferable 0.05%, 0.1%.
Sc2O3、HfO2Although having the function of the high dispersivity of raising glass, but expensive ingredient.It is therefore preferable that Sc2O3、HfO2Each content be above range.
In the optical glass of present embodiment, Lu2O3Content be preferably 2% or less.In addition, Lu2O3Content under Limit preferably 0%.
Lu2O3Have the function of improving the high dispersivity of glass, but big because of molecular weight, and makes the specific gravity of glass Increased glass ingredient.Therefore, Lu2O3Content be preferably above range.
In the optical glass of present embodiment, GeO2Content be preferably 2% or less.In addition, GeO2Content lower limit Preferably 0%.
GeO2Have the function of improving the high dispersivity of glass, but is extremely expensive in usually used glass ingredient Ingredient.Therefore, from the viewpoint of the manufacturing cost for reducing glass, GeO2Content be preferably above range.
In the optical glass of present embodiment, Yb2O3Content be preferably 2% or less.In addition, Yb2O3Content under Limit preferably 0%.
Work as Yb2O3Content it is excessive when, the specific gravity of glass increases, and the thermal stability of glass is likely to decrease.Therefore, Yb2O3 Content be preferably above range.
The optical glass of present embodiment is preferably mainly by above-mentioned glass ingredient, B i.e. as an essential component2O3、 La2O3、ZnO、ZrO2、SiO2、TiO2And Al2O3And then the Gd as any ingredient2O3、BaO、Ta2O5、P2O5、Nb2O5、WO3、 Bi2O3、Li2O、Na2O、K2O、Cs2O、MgO、CaO、SrO、Y2O3、Sc2O3、HfO2、Lu2O3、GeO2And Yb2O3It constitutes, it is above-mentioned Total content of glass ingredient is preferably more than 95%, more preferable ratio more than 98%, further preferred ratio more than 99%, still more preferably More than 99.5%.
In addition, the optical glass of present embodiment is preferably substantially made of above-mentioned glass ingredient, but do not interfering this hair In the range of bright function and effect, it can also contain other ingredients.In addition, in the present invention, it is not excluded that containing inevitable Impurity.
(other ingredients)
In addition to mentioned component, above-mentioned optical glass can also contain Sb on a small quantity2O3、CeO2Deng as clarifying agent.Clarifying agent Total amount (additional additive amount) be 0% or more, be preferably set to more preferably be set as 0% or more 0.5% or less less than 1%.
Additional additive amount refers to, as expressed in weight percent, contain the total of whole glass ingredients in addition to clarifying agent Measure the additive amount of clarifying agent when being set as 100%.
Pb, Cd, As, Th etc. are the ingredients that possible cause environmental damage.Therefore, PbO, CdO, ThO2Respective content is equal Preferably 0~0.1%, more preferably 0~0.05%, it is still more preferably 0~0.01%, does not include substantially particularly preferably PbO、CdO、ThO2。
As2O3Content be preferably 0~0.1%, more preferably 0~0.05%, be still more preferably 0~0.01%, it is special As is not preferably included substantially2O3。
In turn, high transmissivity can be obtained in wide scope of the above-mentioned optical glass in entire visible light region.In order to effectively sharp With such speciality, preferably above-mentioned optical glass does not include the element of coloring.As the element of coloring, can illustrate Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, V etc..Either element is preferably smaller than 100 mass ppm, more preferably 0~80 mass ppm, into One step is preferably 0~50 mass ppm hereinafter, not including substantially particularly preferably.
In addition, Ga, Te, Tb etc. are the ingredient for not needing to import, and expensive ingredient.Therefore, it is indicated with quality % Ga2O3、TeO2、TbO2The range of content be respectively preferably 0~0.1%, more preferably 0~0.05%, further preferably 0~0.01%, it is still more preferably 0~0.005%, much further preferably from 0~0.001%, particularly preferably substantially not Include.
(glass performance)
<Abbe number ν d>
In the optical glass of present embodiment, Abbe number ν d is more than 39 and is 45 or less.Abbe number ν d can be also set as 39.5~43 or 40~42.In contrast the ingredient for reducing Abbe number ν d is Nb2O5、TiO2、ZrO2、Ta2O5、WO3.In contrast The ingredient for improving Abbe number ν d is SiO2、B2O3、Li2O、Na2O、K2O、La2O3,BaO,CaO,SrO.By suitably adjust these at The content divided, so as to control Abbe number ν d.
<refractive index nd>
In the optical glass of present embodiment, refractive index nd is preferably 1.77~1.84.Refractive index nd can be also set as 1.78~1.83 or 1.79~1.82.In contrast the ingredient for improving refractive index nd is Nb2O5、TiO2、ZrO2、Ta2O5、La2O3。 In contrast the ingredient for reducing refractive index nd is SiO2、B2O3、Li2O、Na2O、K2O.By suitably adjusting the content of these ingredients, So as to control refractive index nd.
<specific gravity of glass>
The specific gravity of the optical glass of present embodiment be preferably 4.5 hereinafter, in turn successively preferably 4.4 or less, 4.33 or less, 4.3 following.Specific gravity is smaller the more preferred, and lower limit is not particularly limited, and usually 4.1 or so.In contrast hyperbaric ingredient is mentioned For BaO, La2O3、ZrO2、Nb2O5、Ta2O5Deng.In contrast dropping low-gravity ingredient is SiO2、B2O3、Li2O、Na2O、K2O etc.. By adjusting the content of these ingredients, so as to control specific gravity.
(manufacture of optical glass)
The optical glass of present embodiment can deploy glass raw material to above-mentioned defined composition, by the glass raw material deployed It is made according to well known glass-making processes.For example, allotment multiple compounds, are sufficiently mixed and batch materials are made, it will Batch materials investment silica crucible, platinum crucible and slightly dissolved (rough melt).The melting as obtained from slightly dissolving Object is quenched, crush after make cullet.And then cullet are put into platinum crucible and are heated, remelted (remelt) system At melten glass, so clarify, homogenize after melten glass is formed, Slow cooling and obtain optical glass.Melten glass Molding, Slow cooling can apply well known method.
In addition, if it is possible to desired glass ingredient be imported into glass in a manner of becoming desired content, then existed The compound used when deploying batch materials is just not particularly limited, and as such compound, can enumerate oxide, carbonic acid Salt, nitrate, hydroxide, fluoride, sulfate etc..
(manufacture of optical element etc.)
When making optical element using the optical glass of present embodiment, well known method can be applied.For example, upper It states in the manufacture of optical glass, melten glass is flowed into mold and is shaped to plate, production includes optical glass of the invention Glass blank.Obtained glass blank is appropriately cut off, grind, is polished, the size, shape for being suitable for compression moulding are made Cut-parts.Cut-parts are heated, are softened, is pressed using well known method and (reheats and suppress), production is similar to light Learn the optical element blank of the shape of element.Optical element blank is annealed, the grinding of well known method, polishing, system are used Make optical element.
Can also according to use purpose production have optical element optical function face apply antireflection film, total reflection film Deng.
According to one method of the present invention, it is capable of providing the optical element comprising above-mentioned optical glass.As optical element Type, can illustrate: the lens such as spherical lens, non-spherical lens, prism, diffraction grating etc..It, can as the shape of lens Illustrate: biconvex lens, plano-convex lens, biconcave lens, plano-concave lens, periscopic convex, periscopic concave etc. are various Shape.Optical element can come by the inclusion of the method for the process processed to the glass forming body comprising above-mentioned optical glass It is manufactured.It as processing, can illustrate: cutting, cutting, rough lapping, smooth grinding, polishing etc..When carrying out such processing, By using above-mentioned glass so as to mitigate breakage, the optical element of high-quality can be stably supplied.
Embodiment
Hereinafter, the present invention is explained in more detail by embodiment.But the present invention is not limited to embodiments Shown in mode.
(embodiment 1)
Production has the glass sample of the composition of glass shown in table 1 according to the following steps, carries out various evaluations.
[manufacture of optical glass]
Firstly, preparing oxide corresponding with the constituent of glass, hydroxide, carbonate, nitrate and sulfate As raw material, is weighed, deployed in such a way that the glass of obtained optical glass is formed as respectively forming shown in table 1 Above-mentioned raw material, raw material are sufficiently mixed.Allotment raw material (batch materials) obtained from carrying out in this way puts into platinum crucible, In 1050 DEG C~1400 DEG C are heated 2~5 hours and melten glass are made, and are stirred and it is made to homogenize, clarified, and later will Melten glass is molded into the metal die for being preheated to proper temperature.With 100 DEG C of temperature lower than glass transition temperature Tg Arbitrary temp between the temperature (Tg+30 DEG C) of (Tg-100 DEG C)~30 DEG C than Tg high carries out 30~120 points to the glass being cast into Clock heat treatment, lets cool to room temperature in furnace, thus obtains glass sample.
[confirmation of glass ingredient composition]
Obtained glass sample is measured using Inductively coupled plasma atomic emission sperctrometry method (ICP-AES) The content of each glass ingredient is confirmed as each composition as shown in Table 1.
[measurement of optical characteristics]
Obtained glass sample is further carried out near glass transition temperature Tg about 30 minutes to about 2 hours After annealing, it is cooled to room temperature in furnace with -30 DEG C/h of cooling rate, obtains annealing specimen.To obtained annealing specimen Measure refractive index nd, ng, nF and nC, Abbe number ν d, specific gravity.As a result shown in table 1.
(i) refractive index nd, ng, nF, nC and Abbe number ν d
For above-mentioned annealing specimen, by the refractometry of JIS standard JIS B7071-1, measure refractive index nd, Ng, nF, nC calculate Abbe number ν d based on following formula.
ν d=(nd-1)/(nF-nC)
(ii) specific gravity
Specific gravity is measured by Archimedes method.
[table 1]
(embodiment 2)
Using each optical glass made in embodiment 1, lens blank is made by well known method, by lens blank Process by known methods such as polishings and makes various lens.
The optical lens of production is biconvex lens, biconcave lens, plano-convex lens, plano-concave lens, periscopic concave, convex The various lens such as mirror concave-convex lens.
Various lens are by the lens combination with the optical glass comprising other types, so as to which second order is satisfactorily corrected Chromatic aberation.
Further, since glass is low-gravity, therefore the weight of each lens is than the lens with comparable optical characteristic, size Want small, be preferably used as various picture pick-up devices, especially because can the such reason of energy conservation etc. and be preferably used as auto-focusing formula Picture pick-up device.It is carried out similarly, has made prism using the various optical glass made in embodiment 1.
It will be understood that embodiment of disclosure is to illustrate and not limit in all respects.The scope of the present invention is It is not shown by above-mentioned explanation as shown in the range of Patent request, it is intended that be equal comprising the range with Patent request Meaning and scope in whole changes.
For example, being formed for glass illustrated by above-mentioned, adjusted by being illustrated the composition recorded in book, so as to Make the optical glass of one embodiment of the present invention.
In addition, certainly can be by 2 or more in the specification items recorded as illustration or preferred scope arbitrarily It is combined.

Claims (2)

1. a kind of optical glass,
Abbe number ν d be more than 39 and for 45 hereinafter,
B2O3Content be 15~35 mass %,
La2O3Content be 35~50 mass %,
The content of ZnO is 5~17 mass %,
ZrO2Content be 3~7.5 mass %,
SiO2Content be more than 0 mass % and for 5 mass % hereinafter,
TiO2Content be more than 0 mass % and for 12 mass % hereinafter,
Al2O3Content be more than 0 mass % and for 5 mass % hereinafter,
Gd2O3Content be 0~5 mass %,
The content of BaO is 0~3 mass %,
Ta2O5Content be 0~2.5 mass %,
Nb2O5And WO3Total content [Nb2O5+WO3] it is 0~6 mass %.
2. a kind of optical element includes optical glass described in claim 1.
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