CN103241941A

CN103241941A - Optical glass

Info

Publication number: CN103241941A
Application number: CN2013101914867A
Authority: CN
Inventors: 汪道清
Original assignee: Salience Science & Technology Industrial Co Ltd
Current assignee: Salience Science & Technology Industrial Co Ltd
Priority date: 2013-05-22
Filing date: 2013-05-22
Publication date: 2013-08-14

Abstract

The invention provides a piece of optical glass which can be supplied steadily, and is lower in cost, excellent in glass stability, less in tinting, high in index of refraction and low in dispersion rate. The optical glass is characterized by comprising the following components in percentage by weight: total amount of 5wt%-32wt% of SiO2 and B2O3, total amount of 45wt%-65wt% of La2O3, Gd2O3 and Y2O3, 0.5wt%-10wt% of ZnO, total amount of 1wt%-20wt% of TiO2 and Nb2O5, 5wt%-10wt% of ZrO2, 0wt%-2wt% of WO3, total amount of 0wt%-10wt% of Li2O, Na2O and K2O, total amount of 0wt%-10wt% of MgO, CaO, SrO and BaO, 0wt%-9wt% of Ta2O5, and 0wt%-1wt% of Sb2O3, wherein the mass ratio of the content of SiO2 and the content of B2O3 (SiO2/ B2O3) is 0.3 to 1.0. According to the optical glass, the contents of Ta2O5 and Gd2O3 are lowered, furthermore, the refractive index of the optical glass nd is guaranteed to be between 1.87 and 1.91, the abbe number Nud is 38.5-42, and the optical glass can be produced steadily when the pigmentation degree Lambada 70 is less than 390nm. The cost of the raw material per kilogram is less than that of the raw material used by the glass published in the existing patent (CN102295409A).

Description

A kind of opticglass

Technical field

The present invention relates to a kind of opticglass, relate in particular to a kind of have the height refraction of excellent stability, glass, the low opticglass that disperses.

Background technology

Opticglass is the glass material for the manufacture of the lens in opticinstrument or the mechanical system, prism, speculum and window etc.The opticglass light transmission is good.The refractive index height is widely used in making opticinstruments such as ophthalmic lens, photographic camera, visual telescope, microscope and lens.Along with the progress of science and technology, digital product updates, and is also increasing to the demand of opticglass, and the performance of opticglass is also had higher requirement.

Have high refractive index, the low opticglass that disperses is widely used in the present imaging device, for example: by high refractive index, lowly disperse two one group on the lens that glass forms, can revise aberration and make the optical system miniaturization.Therefore, the low opticglass that disperses of high refractive index occupies very important position in projection optics systems such as optical system or projector.

Yet the disclosed high refractive index in prior art field, the low opticglass that disperses exist a lot of deficiencies or defective, and for example: patent documentation CN102295409A discloses a kind of high refractive index, the low opticglass that disperses, and refractive index n d is 1.86-1.89, but Ta ₂O ₅Content is 5wt%-12.9wt%, and why the low glass that disperses of this high refractive index contains a large amount of Ta ₂O ₅, be because be the higher specific refractory power of maintenance for refractive index n d more than or equal to 1.75 high refractive index, the low opticglass that disperses, but Ta ₂O ₅Be a kind of expensive rare earth element, therefore above-mentioned opticglass is because Ta ₂O ₅Content is higher, and its cost is higher, simultaneously Gd ₂O ₃As the important component that improves specific refractory power, also causing refractive index n d is 1.86-1.89, and Abbe number ν d is that the high refractive index of 38.5-42, the low opticglass cost that disperses rise.Simultaneously owing to introduced WO ₃, make the degree of staining λ of opticglass ₇₀Greater than 390nm.

Summary of the invention

At the problem of above existence, the technical problem to be solved in the present invention provides a kind of Ta ₂O ₅Content is 2wt%-8wt%, Gd ₂O ₃Content is 10wt%-15wt%, and refractive index n d is 1.87-1.91, and Abbe number ν d is 38.5-42, glass coloring degree λ ₇₀Opticglass smaller or equal to 390nm.

The objective of the invention is to reduce expensive especially Ta in high refractive index, the low dispersion optical glass element ₂O ₅And Gd ₂O ₃Import volume, simultaneously in order to keep devitrification resistance and to apply the low dispersing characteristic of high refractive index, if just reduce Ta ₂O ₅And Gd ₂O ₃Amount, then can not vitrifying, perhaps glass in process of production can devitrification and is become frippery.In order under situation, to reduce Ta avoiding above-mentioned ₂O ₅And Gd ₂O ₃The situation of import volume under, the distribution that high refractive index the applies composition outbalance that seems.

In the present invention, importing is as the B of the network forming oxide of glass ₂O ₃, SiO ₂, and make the La that applies composition as high refractive index ₂O ₃, Gd ₂O ₃And Y ₂O ₃In at least a, ZnO and TiO ₂Or Nb ₂O ₅In at least one as must composition and coexist.

In the present invention, ZnO improves fusion property, reduces the glass tansition temperature and helps high refractive index to hang down important component decentralized and the raising devitrification resistance, by adjusting B ₂O ₃With SiO ₂The balance of amount, can improve the plasticity of devitrification resistance, fusion property, melten glass, realize the balance with other compositions.

By improving fusion property and stability, glass, can suppress the rising of glass melting temperature, thereby make glass be difficult to corrode the material that constitutes glass melting equipment, reduce, suppress to be melted to platinum ion in the melten glass etc. and make the mixed volume of the material of painted deterioration, thereby can access painted few glass; Improve the TiO of stability, glass by restriction ₂, Nb ₂O ₅And WO ₃The upper limit of total content, can suppress the painted of glass.

In sum, the invention provides a kind of Ta ₂O ₅, Gd ₂O ₃The high refractive index that content is low, the low opticglass that disperses comprise following composition:

The total amount is the SiO of 5wt%-32wt% ₂And B ₂O ₃

The total amount is the La of 45wt%-65wt% ₂O ₃, Gd ₂O ₃And Y ₂O ₃

The ZnO of 0.5wt%-10wt%;

The total amount is the TiO of 1wt%-20wt% ₂And Nb ₂O ₅

The ZrO of 5wt%-10wt% ₂

The WO of 0-2wt% ₃

The total amount is the Li of 0-10wt% ₂O, Na ₂O and K ₂O;

The total amount is MgO, CaO, SrO and the BaO of 0-10wt%;

The Ta of 0-9wt% ₂O ₅

The Sb of 0-1wt% ₂O ₃

Preferably, SiO ₂With B ₂O ₃Total amount per-cent be 5wt%-30wt%;

Further, SiO ₂With B ₂O ₃Total amount per-cent be 7wt%-28wt%;

Further, SiO ₂With B ₂O ₃Total amount per-cent be 9wt%-25wt%;

Further, SiO ₂With B ₂O ₃Total amount per-cent be 12wt%-23wt%.

Preferably, SiO ₂With B ₂O ₃Mass ratio be 0.3-1.0;

Further, SiO ₂With B ₂O ₃Mass ratio be 0.3-0.9;

Further, SiO ₂With B ₂O ₃Mass ratio be 0.4-0.9;

Further, SiO ₂With B ₂O ₃Mass ratio be 0.4-0.8.

Preferably, SiO ₂Mass percent be 2wt%-15wt%;

Further, SiO ₂Mass percent be 4wt%-13wt%;

Further, SiO ₂Mass percent be 5wt%-12wt%;

Further, SiO ₂Mass percent be 5wt%-10wt%.

Preferably, B ₂O ₃Mass percent be 6wt%-30wt%;

Further, B ₂O ₃Mass percent be 6wt%-25wt%;

Further, B ₂O ₃Mass percent be 8wt%-20wt%;

Further, B ₂O ₃Mass percent be 9wt%-15wt%.

Preferably, La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total amount per-cent be 47wt%-63wt%;

Further, La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total amount per-cent be 49wt%-61wt%;

Further, La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total amount per-cent be 51wt%-60wt%;

Further, be the La of 25wt%-65wt% ₂O ₃, the Gd of 0-25wt% ₂O ₃Y with 0-20wt% ₂O ₃

Further, be the La of 30wt%-60wt% ₂O ₃, the Gd of 0.1wt%-20wt% ₂O ₃Y with 0.1wt%-18wt% ₂O ₃

Further, be the La of 30wt%-58wt% ₂O ₃, the Gd of 2wt%-18wt% ₂O ₃Y with 0.1wt%-16wt% ₂O ₃

Further, be the La of 32wt%-55wt% ₂O ₃, the Gd of 7wt%-15wt% ₂O ₃Y with 0.1wt%-10wt% ₂O ₃

Preferably, the mass percent of ZnO is 1wt%-10wt%;

Further, the mass percent of ZnO is 1wt%-8wt%.

Preferably, TiO ₂And Nb ₂O ₅Total amount per-cent be 2wt%-20wt%;

Further, TiO ₂And Nb ₂O ₅Total amount per-cent be 2wt%-18wt%;

Further, TiO ₂And Nb ₂O ₅Total amount per-cent be 2wt%-16wt%.

Preferably, TiO ₂Mass percent be 0.1wt%-15wt%;

Further, TiO ₂Mass percent be 1wt%-15wt%;

Further, TiO ₂Mass percent be 2wt%-9wt%.

Preferably, Nb ₂O ₅Mass percent be 0.1wt%-15wt%;

Further, Nb ₂O ₅Mass percent be 1wt%-15wt%;

Further, Nb ₂O ₅Mass percent be 1wt%-13wt%;

Further, Nb ₂O ₅Mass percent be 1wt%-9wt%.

Preferably, ZrO ₂Mass percent be 5wt%-9wt%;

Further, ZrO ₂Mass percent be 5wt%-8wt%;

Further, ZrO ₂Mass percent be 5wt%-7wt%.

Preferably, WO ₃Mass percent be 0-1.5wt%;

Further, WO ₃Mass percent be 0-1wt%;

Further, WO ₃Mass percent be 0-0.3wt%;

Especially, can not comprise WO ₃

Preferably, Li ₂O, Na ₂O and K ₂The total amount per-cent of O is 0-8wt%;

Further, Li ₂O, Na ₂O and K ₂The total amount per-cent of O is 0-6wt%;

Further, Li ₂O, Na ₂O and K ₂The total amount per-cent of O is 0-4wt%;

Further, Li ₂O, Na ₂O and K ₂The total amount per-cent of O is 0-2wt%.

Especially, can not comprise Li ₂O, Na ₂O and K ₂O.

Preferably, the total amount per-cent of MgO, CaO, SrO and BaO is 0-8wt%;

Further, the total amount per-cent of MgO, CaO, SrO and BaO is 0-6wt%;

Further, the total amount per-cent of MgO, CaO, SrO and BaO is 0-4wt%;

Further, the total amount per-cent of MgO, CaO, SrO and BaO is 0-2wt%;

Further, the total amount per-cent of MgO, CaO, SrO and BaO is 0-1wt%.

Preferably, Ta ₂O ₅Mass percent be 0-8wt%;

Further, Ta ₂O ₅Mass percent be 0-6wt%;

Further, Ta ₂O ₅Mass percent be 0-4wt%;

Further, Ta ₂O ₅Mass percent be 0-2wt%;

Further, Ta ₂O ₅Mass percent be 0-1wt%;

Especially, can not comprise Ta ₂O ₅

Preferably, Sb ₂O ₃Mass percent be 0-0.5wt%;

Further, Sb ₂O ₃Mass percent be 0-0.1wt%;

Especially, can not comprise Sb ₂O ₃

Embodiment

Below to the technical scheme in the embodiment of the invention carry out clear, intactly describe, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.All embodiment that embodiment in inventing, those skilled in the art obtain under the prerequisite of not making creative work belong to protection scope of the present invention.

A kind of opticglass provided by the invention comprises following composition:

The total amount is the SiO of 5wt%-32wt% ₂And B ₂O ₃

The total amount is the La of 45wt%-65wt% ₂O ₃, Gd ₂O ₃And Y ₂O ₃

The ZnO of 0.5wt%-10wt%;

The total amount is the TiO of 1wt%-20wt% ₂And Nb ₂O ₅

The ZrO of 5-10wt% ₂

The WO of 0-2wt% ₃

The total amount is the Li of 0-10wt% ₂O, Na ₂O and K ₂O;

The total amount is MgO, CaO, SrO and the BaO of 0-10wt%;

The Ta of 0-9wt% ₂O ₅

The Sb of 0-1wt% ₂O ₃

Restriction reason to the compositing range of opticglass of the present invention describes, and short of special record, adds up to content to represent with wt% at the content of each composition.

SiO ₂And B ₂O ₃All be that network generates oxide body, and be to keep the stability of glass and necessary necessary composition.If SiO ₂, B ₂O ₃Total content less than 5wt%, then be difficult to keep stability, glass, devitrification easily in glass is made, if above-mentioned total content greater than 32wt%, then specific refractory power can descend, so SiO ₂And B ₂O ₃Total content be 5wt%-32%.

In network forming oxide, SiO ₂Have the viscosity keeping stability, glass, keep the shaping that is suitable for melten glass, improve effects such as chemical durability, if but import volume is excessive, then be difficult to realize specific refractory power, the Abbe number expected, liquidus temperature and glass tansition temperature can rise, and perhaps glass melting and devitrification resistance can worsen.

B ₂O ₃Have the glass melting kept, suppress the rising of liquidus temperature, low decentralized such effect, but import excessively, stability, glass can descend, and be difficult to the specific refractory power that obtains expecting, and chemical durability can worsen.

At SiO ₂And B ₂O ₃Total content in above-mentioned scope, for realize desired optical and can keep stability, glass, keep the shaping that is suitable for melten glass viscosity, improve chemical durability, suppress liquidus temperature and glass tansition temperature rising, improve meltbility, need to keep SiO ₂And B ₂O ₃The balance of content.If SiO ₂Content and B ₂O ₃The mass ratio (SiO of content ₂/ B ₂O ₃) less than 0.3, then stability, glass descends, and is difficult to keep viscosity and the chemical durability decline of stability, glass and the shaping that is suitable for melten glass.

Simultaneously, if SiO ₂/ B ₂O ₃Mass ratio is greater than 1.0, and then liquidus temperature and glass tansition temperature can rise, and glass melting and devitrification resistance can worsen, and is difficult to low decentralized.So SiO ₂Content and B ₂O ₃The mass ratio of content be 0.3-1.0.

In opticglass of the present invention, from realize desired optical and keep stability, glass, keep the shaping that is suitable for melten glass viscosity, improve chemical durability, suppress liquidus temperature and glass tansition temperature rising, improve the aspect of meltbility, preferably make SiO ₂Content be 2wt%-15wt%, make B ₂O ₃Content be 6wt%-30wt%.

In addition, by making SiO ₂And B ₂O ₃Content become above-mentioned scope, can improve glass melting and stability, glass, therefore can suppress the rising of melt temperature, can suppress to constitute the erosion of the thermotolerance materials such as platinum of glass melting equipment, can suppress, reduce since eater for example platinum ion be blended into cause in the glass painted.

La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Be the composition of realizing the low dispersing characteristic of glass high refractive index, and also be to apply the composition that is difficult to make glass coloring in the composition in high refractive index.Therefore, if can increase La keeping under the situation of stability, glass ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content, then realize painted few high refractive index low disperse aspect the glass very effective.

In the present invention, by making La as hereinafter described ₂O ₃, Gd ₂O ₃And Y ₂O ₃Allocation optimization or import TiO ₂Or Nb ₂O ₅In at least one, can improve stability, glass, therefore can increase La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content, such situation also becomes can realize the low principal element of disperseing glass of painted few high refractive index.

If La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content less than 45wt%, then be difficult to realize specific refractory power, the dispersion expected, and chemical durability can descend, but work as La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content greater than 65wt%, then liquidus temperature can rise, devitrification resistance can worsen, the viscosity when melten glass is shaped descends, and therefore causes plasticity also can descend.Therefore, make La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content be 45wt%-65wt%.La ₂O ₃, Gd ₂O ₃And Y ₂O ₃In the composition keeping stability, glass and improve the effect maximum of specific refractory power be La ₂O ₃But the specific refractory power when keeping low dispersiveness of the opticglass among the present invention is high, if therefore only use the La in above-mentioned three compositions ₂O ₃, then be difficult to guarantee good stability, glass.Therefore, in the present invention by making the La in three compositions ₂O ₃Content maximum, and make La ₂O ₃And Gd ₂O ₃Coexistence perhaps makes La ₂O ₃And Y ₂O ₃Coexistence can realize the low glass that disperses of high refractive index, and have good stability, glass.

In the opticglass optimal way in the present invention, La ₂O ₃Content be 25wt%-65wt%, Gd ₂O ₃Content be 0-25wt%, Y ₂O ₃Content be 0-20wt%.By making La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Total content and La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Partition ratio become described scope, preferably make La ₂O ₃, Gd ₂O ₃And Y ₂O ₃Each content become in the described scope, can further improve stability, glass, also can further improve the plasticity of melten glass.In addition, the rising of glass melting temperature can be suppressed, the platinum of melt container or platinum alloy can be prevented from constituting by glass attack and be melted to as ion making glass coloring in the glass or be blended in the glass as solid.

ZnO has and improves glass melting, devitrification resistance and reduce liquidus temperature and the effect of glass tansition temperature realizing that aspect the low dispersing characteristic of high refractive index be useful necessary composition.If its amount is less than 0.5wt%, then specific refractory power can descend, and liquidus temperature can rise, and devitrification resistance can worsen.And the glass tansition temperature rises, the Heating temperature when causing increasing temperature when making glass annealing, thermoplastic and die forming.On the other hand, if its amount then is difficult to realize the specific refractory power of expecting greater than 10wt%.Therefore, the content of ZnO is 0.5wt%-10wt%.

TiO ₂And Nb ₂O ₅All are the big compositions of effect that improve specific refractory power, because as only passing through La ₂O ₃, Gd ₂O ₃, Y ₂O ₃Such rare-earth oxide becomes to assign to improve specific refractory power, and then stability, glass can descend, be difficult to make, but by making rare-earth oxide and TiO ₂, Nb ₂O ₅In at least one coexistence, can keep stability, glass and improve specific refractory power.In addition, by importing TiO ₂And Nb ₂O ₅In at least one, also can improve the chemical durability of glass.From obtaining the aspect of such effect, make TiO ₂And Nb ₂O ₅Total content more than or equal to 1wt%, if but above-mentioned total content greater than 20wt%, then liquidus temperature can rise, and the viscosity when melten glass is shaped can descend, plasticity can worsen.And the glass tansition temperature also can rise, thereby must improve annealing temperature, the Heating temperature when perhaps improving heating glass material and die forming, and it is remarkable that the thermal degradation when of annealing device and model forming module becomes.In addition, the painted of glass also can increase.Therefore, make TiO ₂And Nb ₂O ₅Total content be 1wt%-20wt%.

TiO ₂Content be preferably greater than from the aspect that improves specific refractory power, further improves chemical durability and devitrification resistance and equal 0.1wt%, but from suppress the aspect of liquidus temperature and glass tansition temperature than the lowland, preferably smaller or equal to 15wt%.Therefore, TiO ₂The content preferred range be 0.1wt%-15wt%.

From improve specific refractory power, further reduce liquidus temperature, further improve the viewpoint of devitrification resistance, make Nb ₂O ₅Content more than or equal to 0.1wt%, if but Nb ₂O ₅Content greater than 15wt%, then begin to occur the tendency that liquidus temperature rises, the tendency of enhancement of dispersion, the painted tendency of glass, so Nb ₂O ₅The content preferred range be 0.1wt%-15wt%.

Preferred opticglass is TiO in the present invention ₂And Nb ₂O ₅The glass ingredient that coexists as glass ingredient, and show good stability, glass.

ZrO ₂A small amount of importing has the effect that improves specific refractory power, improves chemical durability, even also can access good above-mentioned effect.If but ZrO ₂Amount is greater than 15wt%, and then glass tansition temperature and liquidus temperature can rise, and devitrification resistance can descend.Therefore, ZrO ₂Content be 5wt%-15wt%.In the preferred mode of the design's opticglass, ZrO ₂Content be 5wt%-10wt%.

WO ₃Be the composition that improves specific refractory power, reduction liquidus temperature, helps to improve devitrification resistance, if but WO ₃Amount greater than 2wt%, then liquidus temperature can rise, devitrification resistance can worsen, in addition, the painted of glass also can strengthen.Therefore, WO ₃Content be 0-2wt%.

Li ₂O, Na ₂O and K ₂O has any composition that improves meltbility, reduces the effect of glass tansition temperature.If Li ₂O, Na ₂O and K ₂The total content of O is greater than 10wt%, then is difficult to realize the specific refractory power expected, and chemical durability also can descend.Therefore, Li ₂O, Na ₂O and K ₂The total content of O is 0-10wt%.

MgO, CaO, SrO and BaO have the effect that improves the light transmittance in glass melting and the visible region.In addition, import in the glass by the form with carbonate, nitrate, also can access the effect of froth breaking.But, if its amount greater than 10wt%, then liquidus temperature can rise, devitrification resistance can worsen, and specific refractory power can descend, chemical durability also can worsen.Therefore, making the total content of MgO, CaO, SrO and BaO is 0-10wt%.Especially, when keeping stability, glass and further making the glass high refractive index, especially preferably do not comprise alkaline-earth metals oxide.

Ta ₂O ₅Be low decentralized and improve the very effective composition of stability, glass for high refractive index, but very expensive, therefore in order to reach the low glass that disperses of stable supply high refractive index as the design's purpose, its content is suppressed at below the 12wt%.If make Ta ₂O ₅Content become above-mentioned scope, then specific refractory power can descend, stability, glass can reduce significantly, but by comprising TiO ₂And Nb ₂O ₅In at least one, TiO preferably ₂And Nb ₂O ₅The two can reduce Ta under the situation of not damaging the low dispersing characteristic of high refractive index and stability, glass ₂O ₅Content.In addition, if Ta ₂O ₅Content greater than 9wt%, then liquidus temperature can rise, devitrification resistance can worsen.Therefore, Ta ₂O ₅Content be 0-9wt%.

But, when further improvement of preferential stability, glass, preferably import a spot of Ta ₂O ₅By importing a spot of Ta ₂O ₅, except can further improving stability, glass, can also keep high refractive index, and reduce La ₂O ₃Content, therefore can reduce the glass melting temperature.By reducing melt temperature, can reduce, suppress painted to the erosion of melt container and glass as mentioned above.

Sb ₂O ₃Can be used as finings and add, also have the effect that suppresses to cause owing to impurity such as sneaking into Fe light transmittance decline by a small amount of interpolation, but since its powerful oxygenizement, the deterioration of the forming face of model forming module in the time of can encouraging die forming.In addition, by adding Sb ₂O ₃, can show the tendency of the painted increase of glass.Therefore, Sb ₂O ₃Addition beyond ratio represent preferred 0-1wt%, especially preferably do not add Sb ₂O ₃, namely do not have Sb glass.

In addition, consider the influence to environment, also preferably do not import As, Pb, U, Th, Te, C etc.

In addition, from effectively utilizing the radioparent aspect of the good light of glass, preferably do not import the material that Cu, Cr, V, Fe, N, Co etc. become painted principal element.

In order further to understand technical scheme of the present invention, specific embodiment below in conjunction with in the table 1 is described the preferred embodiments of the invention, but is to be understood that, these are described just to further specifying the features and advantages of the present invention, rather than to the restriction of claim of the present invention.

The opticglass that embodiment of the invention 1-7 provides prepares in accordance with the following methods:

Oxide compound, oxyhydroxide, carbonate, nitrate weighing in proportion with composition shown in the table 1, fully mixing the back adds in the 2L platinum crucible, after 1400-1450 ℃ of fusing, clarification, homogenizing, be cooled to 1320 ℃, be poured into again in the mould of prior preheating, and at 700-30 ℃ glass is annealed, obtain high refractive index of the present invention, the low opticglass that disperses.

Claims

1. opticglass, it is characterized in that: refractive index n d is 1.87-1.89; Abbe number ν d is 38.5-42; And degree of staining λ ₇₀Smaller or equal to 390nm, contain as necessary component: SiO ₂, B ₂O ₃, La ₂O ₃, Gd ₂O ₃, Y ₂O ₃, ZnO, TiO ₂, Nb ₂O ₅, ZrO ₂

2. opticglass according to claim 1 is characterized in that: SiO ₂With B ₂O ₃Mass ratio greater than 0.3 less than 1.0.

3. opticglass according to claim 1 is characterized in that:

As essential components contents be:

SiO ₂、B ₂O ₃5wt%-32wt%

La ₂O ₃、Gd ₂O ₃、Y ₂O ₃ 45wt%-65 wt%

ZnO 0.5 wt%-10 wt%

TiO ₂、Nb ₂O ₅1 wt%-20 wt%

ZrO ₂ 5wt%-10wt%

And optional components content is respectively:

Sb ₂O ₃0-1 wt%

WO ₃ 0-2 wt%

Li ₂O、Na ₂O、K ₂O 0-10 wt%

MgO、CaO、SrO、BaO 0-10 wt%

Ta ₂O ₅0-9wt%。