CN106746613A - Optical glass - Google Patents

Abstract

The present invention provide a kind of internal soundness it is excellent and with excellent transmitance and devitrification resistance can optical glass.Optical glass, its constituent represents that cation contains by weight percentage：P⁵⁺：8 25%；Al³⁺：5 20%；Ba²⁺：20 50%；Sr²⁺：15 40%；Mg²⁺：0.5 8%；Ca²⁺：1 10%；La³⁺：0 10%；Gd³⁺：0 10%；Y³⁺：0 10%；Anion contains：F^‑：40 90%；O^2‑：10 60%.The present invention makes optical glass of the present invention while to be 1.48 1.58, Abbe number be 75 83 with refractive index, with excellent internal soundness, transmitance and devitrification resistance energy by rational formula design.

Description

Optical glass

Technical field

The present invention relates to a kind of optical glass, the optical glass, glass more particularly, to a kind of low dispersion of low-refraction are pre- Product and optical element.

Background technology

For optical glass, refractive index, Abbe number, transmitance are its core photosensitiveness features.Refractive index and Abbe number The basic function of glass is determined, it is low that the optical glass that refractive index is 1.48-1.58, Abbe number is 75-83 belongs to low-refraction Dispersion optical glass, application of this kind of high-performance glass in optical system can effectively eliminate secondary aberration, improve imaging matter Amount.

Optical glass is in addition to the optical property of setting is needed, it is necessary to have an excellent internal soundness, such as striped, bubble and Field trash etc..In some cases, the quality of inside glass depends on the composition of glass, and the big optical glass of fluorinated volume is due to molten During change, fluorine has stronger volatility, therefore easily the fluctuation of striped and optical constant occurs.On the other hand, glass Internal soundness additionally depends on the working condition of glass.In the manufacturing process of optical glass, usually using platinum or platinum alloy As fusing instrument, when instrument is melted in high melt temperature or melting time molten raw long with platinum class, platinum dissolution Will increase into the amount in glass, so as to produce field trash in glass.

CN1854100B discloses a kind of refractive index for 1.40-1.58, Abbe number are the optical glass of 67-90, wherein containing There is 1-10% moles of Li⁺, during high melt, the Li in glass ingredient⁺Easily corrosion platinum or platinum alloy vessel, cause More platiniferous foreign matter is produced in finished glass, causes the quality decline of glass.Meanwhile, containing Li⁺When glass is used for precise compression molding, The risk of glass elements surface blur is easily produced, reason is the releasing agent that carbon elements are typically coated with mould, glass group Li in point⁺Carbon easily and in releasing agent is reacted, and coarse opaque film layer is produced on glass elements surface.Cause How this solves glass containing F due to stripes problem caused by volatilization and reduces due to the field trash that the corrosion of platinum dish is introduced Problem turns into the target of optical glass scientific research personnel research.

The content of the invention

It is excellent and with excellent transmitance and anti-analysis that the technical problems to be solved by the invention are to provide a kind of internal soundness The optical glass of brilliant performance.

The present invention also provides a kind of gas preform and optical element formed by above-mentioned optical glass.

The technical proposal for solving the technical problem of the invention is：Optical glass, its constituent is by weight percentage Represent, cation contains：P⁵⁺：8-25%；Al³⁺：5-20%；Ba²⁺：20-50%；Sr²⁺：15-40%；Mg²⁺：0.5-8%；Ca^{2 +}：1-10%；La³⁺：0-10%；Gd³⁺：0-10%；Y³⁺：0-10%；Anion contains：F^-：40-90%；O^2-：10-60%.

Optical glass, its constituent represents that cation contains by weight percentage：P⁵⁺：8-25%；Al³⁺：5-20%； Ba²⁺：20-50%；Sr²⁺：15-40%；Mg²⁺：0.5-8%；Ca²⁺：1-10%；La³⁺：0-10%；Gd³⁺：0-10%；Y³⁺：0- 10%；Wherein Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.5；Anion contains：F^-：40-90%；O^2-：10-60%.

Further, cation also contains：Zn²⁺：0-5%；Yb³⁺：0-5%；B³⁺：0-5%.

Further, alkali metal ion Li is not contained⁺、Na⁺、K⁺。

Optical glass, its constituent represents by weight percentage, its cation by 8-25% P⁵⁺；The Al of 5-20%^{3 +}；The Ba of 20-50%²⁺；The Sr of 15-40%²⁺；The Mg of 0.5-8%²⁺；The Ca of 1-10%²⁺；The La of 0-10%³⁺；The Gd of 0-10%^{3 +}；The Y of 0-10%³⁺；The Zn of 0-5%²⁺；The Yb of 0-5%³⁺；The B of 0-5%³⁺Constitute；Anion is by F^-And O^2-Constitute, wherein：F^-： 40-90%；O^2-：10-60%.

Further, Ln³⁺Content is 0-10%, wherein Ln³⁺It is by La³⁺、Gd³⁺、Y³⁺In at least one composition.

Further, its anion percentage by weight contains：F^-：45-85%；O^2-：15-55%.

Further, its anion percentage by weight contains：F^-：50-80%；O^2-：20-50%.

Further, wherein：P⁵⁺：10-22%；And/or Al³⁺：6-18%；And/or Ba²⁺：23-48%；And/or Sr²⁺： 18-35%；And/or Mg²⁺：0.8-6%；And/or Ca²⁺：1.5-8%；And/or La³⁺：More than 0 but less than or equal to 8%；With/ Or Gd³⁺：More than 0 but less than or equal to 8%；And/or Y³⁺：More than 0 but less than or equal to 8%；And/or Zn²⁺：0-4%；And/or Yb³⁺：0-4%；And/or B³⁺：0-4%.

Further, wherein：P⁵⁺：10-20%；And/or Al³⁺：8-15%；And/or Ba²⁺：25-45%；And/or Sr²⁺： 20-30%；And/or Mg²⁺：1-5%；And/or Ca²⁺：2-7%；And/or La³⁺：More than 0 but less than or equal to 5%；And/or Gd^{3 +}：More than 0 but less than or equal to 5%；And/or Y³⁺：More than 0 but less than or equal to 5%；And/or Zn²⁺：0-3%；And/or Yb³⁺： 0-3%；And/or B³⁺：0-3%.

Further, its component ions content meets one or more in following 4 kinds of conditions：

1)F^-/O^2-It is 1-3.5；

2)Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.5；

3)R²⁺More than 45%；

4)Al³⁺/R²⁺Below 0.4；

Wherein, R²⁺It is Mg²⁺、Ca²⁺、Sr²⁺And Ba²⁺Total amount.

Further, its component ions content meets one or more in following 4 kinds of conditions：

1)F^-/O^2-It is 1-3；

2)Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.3；

3)R²⁺More than 50%；

4)Al³⁺/R²⁺Below 0.3；

Wherein, R²⁺It is Mg²⁺、Ca²⁺、Sr²⁺And Ba²⁺Total amount.

Further, the also fining agent containing 0-1%, the fining agent is Cl^-、Br^-、I^-、Sb³⁺、Ce⁴⁺In one kind or It is various.

Further, refractive index is 1.48-1.58；Abbe number is 75-83；Transition temperature is less than 500 DEG C, and transmittance reaches Corresponding wavelength X during to 80%₈₀Less than or equal to 360nm, transmittance reaches corresponding wavelength X when 5%₅It is less than or equal to 310nm。

Gas preform, is made of above-mentioned optical glass.

Optical element, is made of above-mentioned optical glass.

The beneficial effects of the invention are as follows：Designed by rational component, reduce the volatilization of F contents, effectively control glass is because of F The problems such as striped and optical constant for volatilizing and producing fluctuate；The present invention does not introduce Li⁺, the corrosion of platinum dish is reduced, subtract The appearance risk of few field trash；Introduce rare earth, particularly Gd³⁺, increased the devitrification resistance energy of glass.The present invention is by rational Formula design, make optical glass of the present invention with refractive index be 1.48-1.58, Abbe number be 75-83 while, with excellent Internal soundness, transmitance and devitrification resistance energy.

Specific embodiment

Ith, optical glass

Illustrated below for each composition for constituting optical glass of the invention.

In this manual, in case of no particular description, cationic componentses content is with the sun for the content of each composition The degree that ion accounts for whole cation gross weights represents that it is total that anionic group content accounts for whole anion with the anion The degree of weight is represented.In addition, in the following description, also including when mentioning below setting or more than setting should Setting.

It should be noted that the typical value that the ioni valence of each composition described below is for convenience and uses, with other Ioni valence be not different.The ioni valence of each composition there is a possibility that beyond typical value in optical glass.For example, P generally with Ioni valence is that the state of 5 valencys is present in glass, therefore in this manual with " P⁵⁺" as typical value, but exist with other Ioni valence state exist possibility, this is also within protection scope of the present invention.

[on cationic componentses]

P⁵⁺It is that glass network forms component, with the work for suppressing crystallization, improve glass refraction, suppress Abbe number reduction With present invention introduces more than 8% or more P⁵⁺, it is preferably introduced into more than 10% P⁵⁺；But when its introduction volume is more than 25%, Stability, glass declines, and due to P⁵⁺It is required that with oxide or the raw material form such as the salt containing P is introduced, so oxygen contains in glass Amount causes optical constant to exceed scope of design than increasing.Therefore, P of the invention⁵⁺Content be set to the upper limit by 25%, preferably go up 22% is limited to, the more preferably upper limit is 20%.

Al³⁺There is the effect for improving stability, glass, reducing abrasion degree in fluorphosphate glass, introduced in the present invention More than 5% Al³⁺The stability of glass, preferably more than 6%, more preferably more than 8% can be improved；If but Al³⁺Content It is excessive, can raise the transition temperature of glass, and the meltbility of glass is reduced, therefore its upper content limit is 20%, is preferably gone up 18% is limited to, the further preferred upper limit is 15%.

Ba²⁺With the work for improving glass refraction, maintain relatively low dispersivity, improve glass devitrification resistance energy and heat endurance With the Ba of introducing more than 20% in the present invention²⁺Can improve the refractive index and devitrification resistance energy of glass, preferably more than 23%, more Preferably more than 25%；If but Ba²⁺Content it is excessive, can decline the stability of glass, thus its upper content limit be 50%, it is excellent Choose and be limited to 48%, the further preferred upper limit is 45%.

Sr²⁺With the effect for improving glass refraction, and in P⁵⁺In the case of poor, it may have improve glass weather-proof The effect of property.More than 15% or more Sr is introduced in the present invention²⁺, preferably more than 18%, more preferably more than 20%；If but Sr²⁺Content it is excessive, can decline the stability of glass, thus its upper content limit be 40%, preferred upper limit is 35%, further Preferred upper limit is 30%.

Mg²⁺Dispersion and the refractive index of glass can be reduced, while the chemical stability of glass can be improved, is drawn in the present invention Enter more than 0.5% or more Mg²⁺, preferably more than 0.8%, more preferably more than 1%；If but Mg²⁺Content it is excessive, can make The devitrification resistance of glass can decline, therefore its upper content limit is 8%, and preferred upper limit is 6%, and the further preferred upper limit is 5%.

Ca²⁺The Abbe number and proportion of glass can be not only reduced, and can be introduced in the present invention with the formation of stabilized glass More than 1% or more Ca²⁺, preferably more than 1.5%, more preferably more than 2%；If but Ca²⁺Content it is excessive, glass can be made Devitrification resistance can decline, therefore its upper content limit be 10%, preferred upper limit is 8%, the further preferred upper limit be 7%.

The present inventor is by lot of experiments discovery, Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺This kind of alkaline-earth metal is to improve glass The active ingredient of stability and refractive index, but specific alkaline-earth metal composition is excessive, can destroy the balance with other compositions, because This present invention is preferred all to be imported, as alkaline-earth metal R²⁺(R²⁺It is Mg²⁺、Ca²⁺、Sr²⁺And Ba²⁺Total amount) more than 45% When, the stability of glass can be further improved, while optimizing the light transmission rate of glass, preferably R²⁺It is further excellent more than 50% Elect more than 55% as, be still more preferably more than 60%.

In the present invention, by controlling Al³⁺With R²⁺Ratio Al³⁺/R²⁺Below 0.4, can not only increase the melting of raw material Property and stability, glass, and the increase of average coefficient of linear expansion can be suppressed；Further, Al is controlled³⁺/R²⁺Value 0.3 Hereinafter, glass can be enable to obtain more excellent devitrification resistance.

La³⁺It is the active ingredient of the refractive index for improving glass, appropriate La is introduced in the present invention³⁺Glass can be improved Refractive index and mechanical strength.If but La³⁺Content it is excessive, the tendency towards devitrification of glass can be made increase, liquidus temperature rising, therefore Its upper content limit is 10%, and preferred upper limit is 8%, and the further preferred upper limit is 5%.

Gd³⁺The devitrification resistance energy of glass can be improved, and increases mechanical strength, this hair while refractive index is properly increased The appropriate Gd of bright middle introducing³⁺The devitrification resistance energy of glass can be improved.If but Gd³⁺Content it is excessive, the devitrification of glass can be made to incline To increase, liquidus temperature is raised, therefore its upper content limit is 10%, and preferred upper limit is 8%, and the further preferred upper limit is 5%.

Y³⁺The refractive index of glass can be improved, by introducing appropriate Y in the present invention³⁺, the melting of glass can be improved Property.If but Y³⁺Content it is excessive, the tendency towards devitrification of glass can be made increase, liquidus temperature rising, therefore its upper content limit is 10%, preferred upper limit is 8%, and the further preferred upper limit is 5%.

The present inventor is by studying discovery, Gd³⁺Introduction volume and network formed component introduction volume between proper ratio, can To optimize the devitrification resistance energy that network structure improves glass, and suppress the volatilization of F in glass to a certain extent, reduce and wave because of F The problems such as next inside glass striped of hair band and unstable optical constant.Analyzed by further experiment, by controlling Gd³⁺ With P⁵⁺Ratio Gd³⁺/P⁵⁺When being more than 0 but less than or equal to 0.5, preferably effect can be obtained；Further, Gd is controlled³⁺/ P⁵⁺It is that, more than 0 but less than or equal to 0.3, glass can be enable to obtain more excellent devitrification resistance.

The present inventor is by lot of experiments discovery, La³⁺、Gd³⁺、Y³⁺This kind of rare earth metal is to improve glass refraction Active ingredient, if but total content is excessive or specific rare earth metal composition is excessive, can increase the tendency towards devitrification of glass Greatly, and balance with other compositions can be destroyed, thus it is preferred all import, as rare earth metal Ln³⁺(Ln³⁺It is La³⁺、Gd³⁺And Y³⁺ Total amount) for 0-10% when, can further improve the devitrification resistance energy of glass.

Zn²⁺It is optional components in the present invention, the chemical stability of glass can be improved in appropriate addition glass, while may be used also To reduce the high temperature viscosity and Tg temperature of glass.But, if Zn in the present invention²⁺Addition more than 5%, the devitrification resistance of glass Can decline, while high temperature viscosity is smaller, difficulty be brought to shaping.Therefore, Zn²⁺Content be defined to 0-5%, preferably 0- 4%, more preferably 0-3%.

Yb³⁺It is a kind of high-refraction high-dispersion component, can improves the refractive index of glass in addition glass and adjust dispersion, also The devitrification resistance energy of glass can be properly increased and into glass stability.In the present invention, if its content is higher than 5%, glass can become Must be difficult to melt, smelting temperature can rise, and field trash easily occurs in inside glass, cause transmitance to decline.Therefore, Yb³⁺Content It is 0-5%, preferably 0-4%, more preferably 0-3% are not introduced further preferably.

It is a small amount of to introduce B³⁺When can improve the stability and chemical stability for forming glass, but its content more than 5%, glass is shown Glass meltbility is deteriorated, devitrification resistance reduction, therefore, B in the present invention³⁺Content be 0-5%, more preferably preferably 0-4%, 0- 3%, do not introduce further preferably.

[on anionic group]

F^-It is to reduce glass transition temperature, the composition of yield point temperature, is the necessary component of optical glass of the present invention, this By the F of introducing more than 40% in invention^-, it is used to reduce thermal refractive index coefficient and Tg temperature, improve Abbe number.If its content More than 90%, the stability of glass can be weakened, in increase thermal coefficient of expansion and abrasion degree, especially fusion process, F^-Volatilization Not only pollute the environment, and the optical data of glass can be made beyond scope of design, and trigger the generation of striped.Therefore, F^-Contain It is 40-90% to measure, preferably 45-85%, more preferably 50-80%.

Contain O in optical glass of the present invention^2-, especially by containing more than 10% O^2-, the devitrification of glass can be suppressed Rise with abrasion degree.Therefore, O^2-Content limit 10% be lower limit, preferably 15% be lower limit, further preferred 20% be lower limit. On the other hand, by by O^2-Content be defined to less than 60%, be favorably improved the processability of glass, therefore, the present invention will 60% is defined to O^2-Upper content limit, preferably 55% is the upper limit, and further preferred 50% is the upper limit.

From from the viewpoint of suppressing glass devitrification, F^-With O^2-Total content be preferably more than 98%, more preferably More than 99%, still more preferably it is more than 99.5%.In addition, F^-Content and O^2-The weight ratio F of content^-/O^2-It is 1-4, no Glass of the present invention can only be made has the optical property of low refractive low dispersive, but also it is excellent to have glass of the present invention Heat endurance and low transition temperature.Especially work as F^-/O^2-During for 1-3.5, the transmitance of glass is substantially optimized, further It is preferred that in the range from 1-3.

[on other compositions]

In glass of the present invention, can on a small quantity add fining agent to improve the bubble quality of glass, fining agent can be selected Cl^-、Br^-、I^-、Sb³⁺、Ce⁴⁺In one or more, but when the content of fining agent is more than 1%, easy corrosion platinum or platinum alloy It is 0-1%, more preferably preferably 0-0.5%, 0-0.3% that agent content is clarified in vessel, therefore the present invention.

Due to Li⁺Easily corrosion platinum or platinum alloy vessel, cause to produce more platiniferous foreign matter in finished glass, cause glass The quality decline of glass.Meanwhile, containing Li⁺When glass is for during precise compression molding, easily occur instead with the carbon in releasing agent Should, coarse opaque film layer is produced on glass elements surface, so preferably not containing Li in the present invention⁺。Na⁺Glass can be accelerated The deterioration of devitrification resistance energy, while can extend the time that glass is changed into solid-state from liquid in cooling shaping, creates bar to crystallization Part；K⁺Its water resistance can be caused to be deteriorated.Therefore preferably Li is not contained in the present invention⁺、Na⁺、K⁺Deng alkali metal ion.

[component that should not contain]

Not damaging in the range of glass performance of the invention, can add as needed it is above-mentioned do not referred to other into Point.But, the transiting metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, even if individually or compoundly contain on a small quantity In the case of, glass is also subject to coloration, and the specific wavelength in visible region produces absorption, so that weaken raising of the invention can The property of light transmission rate effect is seen, therefore it is desirable, especially for the optical glass that the transmitance of visible region wavelength is required, excellent Choosing does not include actually.

The cation of Pb, Th, Cd, Tl, Os, Be and Se, has control to use as harmful chemical substance in recent years Tendency, not only in the manufacturing process of glass, until the measure in disposal after manufacturing procedure and commercialization to environmental protection It is required.Therefore, in the case where the influence to environment is paid attention to, in addition to being inevitably mixed into, preferably actually not Contain them, optical glass becomes the material actually not comprising pollution environment.Therefore, even if not taking special environmental cure On measure, optical glass of the invention also can be manufactured, processed and be discarded.

[optical constant of optical glass]

Optical glass of the invention is the low dispersion fluorphosphate glass of low-refraction, and low-refraction low dispersion is made Lens are how combined with the lens that high index of refraction high-dispersion glass is made, for chromatic aberration correction.Optical glass of the invention is from suitable From the point of view of the optical characteristics of its purposes, the scope of glass refraction (nd) is 1.48-1.58, and preferred scope is 1.49-1.57, preferred scope is 1.49-1.56；Abbe number (the ν of glass of the present invention_d) scope be 75-83, preferably model It is 76-82 to enclose.

[coloring of optical glass]

The shortwave transmitted spectrum characteristic degree of staining (λ of glass of the present invention₈₀/λ₅) represent.λ₈₀Refer to that glass transmittance reaches Corresponding wavelength, λ when 80%₅Refer to that glass transmittance reaches corresponding wavelength when 5%.Wherein, λ₈₀Measure be using having The thickness of two parallel to each other and optical polish relative planes is the glass of 10 ± 0.1nm, is determined from 280nm to 700nm Spectral transmission in wavelength domain simultaneously shows the wavelength of transmissivity 80%.So-called spectral transmission or transmissivity refer to, to The above-mentioned surface of glass vertically incident intensity I_inLight, through glass and from another plane project intensity I_outLight feelings Under condition, by I_out/I_inThe amount of expression, and also contains the transmissivity of surface reflection loss on the above-mentioned surface of glass.Glass The refractive index of glass is higher, and surface reflection loss is bigger.Therefore, in glass of high refractive index, λ₈₀Value small mean glass itself Coloring it is few.

Optical glass λ of the invention₈₀Less than or equal to 360nm, preferably λ₈₀It is less than or equal to 355nm, more preferably λ₈₀For Less than or equal to 350nm.λ₅Less than or equal to 310nm, preferably λ₅It is less than or equal to 305nm, more preferably λ₅Be less than or equal to 300nm。

[transition temperature of optical glass]

Optical glass gradually can become mouldable state in a certain temperature range by solid-state.Transition temperature refers to glass specimen from room Temperature is warming up to temperature of hanging down of speeding, the temperature corresponding to its low-temperature region and the intersecting intersection point of high-temperature area straight line portion extended line.

The transition temperature Tg of glass of the present invention below 500 DEG C, preferably less than 495 DEG C, more preferably less than 490 DEG C.

IIth, gas preform and optical element

Below, gas preform of the invention and optical element are described.

Gas preform of the invention is formed with optical element by the optical glass of the invention described above.Glass of the invention Prefabricated component has the low dispersion characteristics of low-refraction；Optical element of the invention has the low dispersion characteristics of low-refraction, can be with low Cost provides the optical elements such as the costly various lens of optics, prism.

As the example of lens, can enumerate lens face for sphere or aspherical recessed meniscus shaped lens, male bend moon-shaped lens, The various lens such as biconvex lens, biconcave lens, planoconvex spotlight, plano-concave lens.

This lens are suitable as color by the lens combination that is made with high index of refraction high-dispersion glass, recoverable aberration The lens of difference correction.

IIIth, embodiment

The present invention is explained using following examples, but the present invention should not be limited to these embodiments.

The melting and forming method for producing optical glass can be used well known to a person skilled in the art technology.Glass is former Material (carbonate, nitrate, phosphate, metaphosphate, fluoride, oxide etc.) is weighed cooperation according to the proportioning of each ion of glass And it is well mixed after, in input smelting apparatus (such as platinum crucible), then taken at 900~1100 DEG C appropriate stirring, clarification, After homogenizing, less than 850 DEG C are cooled to, cast or leakage are noted in mould, the later stage treatment such as last annealed, processing, or It is molded by precise compression molding technology direct pressing.

[optical glass embodiment]

The characteristic of each glass of the invention is determined by method as shown below, and measurement result is represented in 1~table of table 4 In.

(1) refractive index (nd) and Abbe number (ν d)

Refractive index is tested with abbe number according to the method that GB/T7962.1-2010 specifies.

(2) glass coloration degree (λ₈₀、λ₅)

The use of with two thickness of optical polish plane relative to each other is the glass sample of 10 ± 0.1mm, determines and divide Light transmission, calculates according to its result.

(3) glass transformation temperature (Tg)

The method specified by GB/T7962.16-2010 is measured.

Table 1

Table 2

Table 3

Table 4

[gas preform embodiment]

Optical glass obtained by embodiment 1-40 in table 1-4 is cut into predefined size, then is equably applied on the surface Cloth releasing agent, is then heated, softens, and is press-formed, and makes recessed meniscus shaped lens, male bend moon-shaped lens, lenticular The various lens such as mirror, biconcave lens, planoconvex spotlight, plano-concave lens, the prefabricated component of prism.

[optical element embodiment]

By these prefabricated components annealing obtained by above-mentioned gas preform embodiment, the same of the deformation of inside glass is being reduced When be finely adjusted so that the optical characteristics such as refractive index reaches desirable value.

Then, each prefabricated component is ground, ground, make recessed meniscus shaped lens, male bend moon-shaped lens, biconvex lens, The various lens such as biconcave lens, planoconvex spotlight, plano-concave lens, prism.Antireflection can be also coated with the surface of gained optical element Film.

The present invention is low cost and the optical glass of the excellent low refractive low dispersive of chemical stability, and refractive index is 1.48-1.58, Abbe number be 75-83, and the glass formed optical element, disclosure satisfy that Modern New photovoltaic Need.

Claims (16)

1. optical glass, it is characterised in that its constituent represents that cation contains by weight percentage：P⁵⁺：8-25%；Al^{3 +}：5-20%；Ba²⁺：20-50%；Sr²⁺：15-40%；Mg²⁺：0.5-8%；Ca²⁺：1-10%；La³⁺：0-10%；Gd³⁺：0- 10%；Y³⁺：0-10%；

Anion contains：F^-：40-90%；O^2-：10-60%.

2. optical glass, it is characterised in that its constituent represents that cation contains by weight percentage：P⁵⁺：8-25%；Al^{3 +}：5-20%；Ba²⁺：20-50%；Sr²⁺：15-40%；Mg²⁺：0.5-8%；Ca²⁺：1-10%；La³⁺：0-10%；Gd³⁺：0- 10%；Y³⁺：0-10%；Wherein Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.5；

Anion contains：F^-：40-90%；O^2-：10-60%.

3. optical glass as claimed in claim 1 or 2, its constituent represents that cation also contains by weight percentage：Zn^{2 +}：0-5%；Yb³⁺：0-5%；B³⁺：0-5%.

4. the optical glass as described in claim 1-3 any claims, it is characterised in that do not contain alkali metal ion Li⁺、 Na⁺、K⁺。

5. optical glass, it is characterised in that its constituent represents by weight percentage, its cation by 8-25% P⁵⁺；5- 20% Al³⁺；The Ba of 20-50%²⁺；The Sr of 15-40%²⁺；The Mg of 0.5-8%²⁺；The Ca of 1-10%²⁺；The La of 0-10%³⁺；0- 10% Gd³⁺；The Y of 0-10%³⁺；The Zn of 0-5%²⁺；The Yb of 0-5%³⁺；The B of 0-5%³⁺Constitute；

Anion is by F^-And O^2-Constitute, wherein：F^-：40-90%；O^2-：10-60%.

6. the optical glass as described in claim 1-5 any claims, it is characterised in that Ln³⁺Content is 0-10%, wherein Ln³⁺It is by La³⁺、Gd³⁺、Y³⁺In at least one composition.

7. the optical glass as described in claim 1-5 any claims, it is characterised in that its anion percentage by weight contains Have：F^-：45-85%；O^2-：15-55%.

8. the optical glass as described in claim 1-5 any claims, it is characterised in that its anion percentage by weight contains Have：F^-：50-80%；O^2-：20-50%.

9. the optical glass as described in claim 1-5 any claims, it is characterised in that wherein：P⁵⁺：10-22%；With/ Or Al³⁺：6-18%；And/or Ba²⁺：23-48%；And/or Sr²⁺：18-35%；And/or Mg²⁺：0.8-6%；And/or Ca²⁺： 1.5-8%；And/or La³⁺：More than 0 but less than or equal to 8%；And/or Gd³⁺：More than 0 but less than or equal to 8%；And/or Y³⁺： More than 0 but less than or equal to 8%；And/or Zn²⁺：0-4%；And/or Yb³⁺：0-4%；And/or B³⁺：0-4%.

10. the optical glass as described in claim 1-5 any claims, it is characterised in that wherein：P⁵⁺：10-20%；With/ Or Al³⁺：8-15%；And/or Ba²⁺：25-45%；And/or Sr²⁺：20-30%；And/or Mg²⁺：1-5%；And/or Ca²⁺：2- 7%；And/or La³⁺：More than 0 but less than or equal to 5%；And/or Gd³⁺：More than 0 but less than or equal to 5%；And/or Y³⁺：It is more than 0 but less than or equal to 5%；And/or Zn²⁺：0-3%；And/or Yb³⁺：0-3%；And/or B³⁺：0-3%.

11. optical glass as described in claim 1-5 any claims, it is characterised in that its component ions content expires It is enough to one or more in lower 4 kinds of conditions：

1)F^-/O^2-It is 1-3.5；

2)Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.5；

3)R²⁺More than 45%；

4)Al³⁺/R²⁺Below 0.4；

Wherein, R²⁺It is Mg²⁺、Ca²⁺、Sr²⁺And Ba²⁺Total amount.

12. optical glass as described in claim 1-5 any claims, it is characterised in that its component ions content expires It is enough to one or more in lower 4 kinds of conditions：

1)F^-/O^2-It is 1-3；

2)Gd³⁺/P⁵⁺It is more than 0 but less than or equal to 0.3；

3)R²⁺More than 50%；

4)Al³⁺/R²⁺Below 0.3；

Wherein, R²⁺It is Mg²⁺、Ca²⁺、Sr²⁺And Ba²⁺Total amount.

13. optical glass as described in claim 1-4 any claims, it is characterised in that the also clarification containing 0-1% Agent, the fining agent is Cl^-、Br^-、I^-、Sb³⁺、Ce⁴⁺In one or more.

14. optical glass as described in claim 1-5 any claims, it is characterised in that refractive index is 1.48-1.58； Abbe number is 75-83；Transition temperature is less than 500 DEG C, and transmittance reaches corresponding wavelength X when 80%₈₀It is less than or equal to 360nm, transmittance reaches corresponding wavelength X when 5%₅Less than or equal to 310nm.

15. gas preforms, are made of the optical glass described in claim 1-14 any claims.

16. optical elements, are made of the optical glass described in claim 1-14 any claims.