CN107663011A

CN107663011A - Optical glass

Info

Publication number: CN107663011A
Application number: CN201711010689.6A
Authority: CN
Inventors: 李丹
Original assignee: Chengdu Guangming Optoelectronics Co Ltd
Current assignee: CDGM Glass Co Ltd; Chengdu Guangming Optoelectronics Co Ltd
Priority date: 2017-10-25
Filing date: 2017-10-25
Publication date: 2018-02-06
Anticipated expiration: 2037-10-25
Also published as: CN107663011B

Abstract

A kind of cost of present invention offer is relatively low, chemical stability is good and has 1.60 1.70 refractive index, the environmental protection optical glass of 40 50 Abbe number.Optical glass, its composition represents by weight percentage, contains：SiO₂：20 50%；B₂O₃：0 15%；TiO₂：1 15%；ZnO：2 20%；BaO：15 50%.The present invention does not contain Nb even in reduction₂O₅On the premise of, by optimizing alkali metal, alkaline-earth metal, ZnO and TiO₂Content, obtain the glass that cost is cheap, chemical stability is good, crystallization property is excellent, can be widely applied to be imaged, project, in telecommunication, optical communication engineering and laser technology application field, disclosure satisfy that the needs of Modern New photovoltaic.

Description

Optical glass

Technical field

It is 1.60-1.70 more particularly, to a kind of refractive index (nd) the present invention relates to a kind of optical glass, Abbe number (vd) Optical glass for 40-50 and optical precast product, optical element and optical instrument made of the optical glass.

Background technology

In recent years, the optical glass that refractive index (nd) is 1.60-1.70, Abbe number (vd) is 40-50 is widely used in In imaging, projection, telecommunication, optical communication engineering and laser technology application field, but such optical glass still suffers from present Various problems.

Optical glass needs to have preferable chemical stability, could improve non-defective unit in the processing in later stage and plated film flow Rate.Based on such glass mostly uses borate system at present, then add a certain amount of rare earth oxide, alkali metal oxidation Thing and alkaline earth oxide.As B in such glass system₂O₃When content is larger, chemical stability is deteriorated. B containing 30-40% in optical glass disclosed in CN101389574A₂O₃, its chemical stability is poor, especially water resistance compared with Difference.

In recent years, the market competition of optical glass is growing more intense, only cost of material is low, product of excellent combination property Possesses stronger competitiveness.CN1198414A disclose with the close optical glass containing rare earth of above-mentioned optical constant scope, But it contains 31-50% Nb₂O₅, cost of material is substantially increased, is unfavorable for improving the competitiveness of product.

The content of the invention

The technical problems to be solved by the invention are to provide that a kind of cost is relatively low, chemical stability is good and have 1.60- The environmental protection optical glass of 1.70 refractive index, 40-50 Abbe number.

The present invention also provides a kind of optical precast product formed by above-mentioned optical glass, optical element and optical instrument.

The technical proposal for solving the technical problem of the invention is：Optical glass, its composition represent by weight percentage, Contain：SiO₂：20-50%；B₂O₃：0-15%；TiO₂：1-15%；ZnO：2-20%；BaO：15-50%.

Further, also contain：Al₂O₃：0-10%；WO₃：0-10%；ZrO₂：0-10%；Nb₂O₅：0-15%；La₂O₃： 0-10%；Gd₂O₃：0-10%；Y₂O₃：0-10%；Yb₂O₃：0-10%；MgO：0-10%；CaO：0-15%；SrO：0-10%； Li₂O：0-10%；Na₂O：0-15%；K₂O：0-15%；Sb₂O₃：0-1%.

Optical glass, its composition are expressed as by weight percentage：SiO₂：20-50%；B₂O₃：0-15%；TiO₂：1- 15%；ZnO：2-20%；BaO：15-50%；Al₂O₃：0-10%；WO₃：0-10%；ZrO₂：0-10%；Nb₂O₅：0-15%； La₂O₃：0-10%；Gd₂O₃：0-10%；Y₂O₃：0-10%；Yb₂O₃：0-10%；MgO：0-10%；CaO：0-15%；SrO：0- 10%；Li₂O：0-10%；Na₂O：0-15%；K₂O：0-15%；Sb₂O₃：0-1%.

Further, the content of each component meets the one or more in following 6 kinds of situations：

(1)SiO₂+B₂O₃：25-55%；

(2)TiO₂+ZnO：9-30%；

(3)BaO/TiO₂：1-7.5；

(4)(MgO+CaO+SrO+BaO)/ZnO：0.5-9；

(5)Li₂O+Na₂O+K₂O：2-18%；

(6)ZnO/(Li₂O+Na₂O+K₂O)：0.3-4.

Further, wherein：SiO₂：25-45%；And/or B₂O₃：0-10%；And/or TiO₂：5-10%；And/or ZnO： 5-18%；And/or BaO：18-45%；And/or Al₂O₃：0-5%；And/or WO₃：0-5%；And/or ZrO₂：1-10%；And/or Nb₂O₅：0-8%；And/or La₂O₃：0-5%；And/or Gd₂O₃：0-5%；And/or Y₂O₃：0-5%；And/or Yb₂O₃：0-5%； And/or MgO：0-5%；And/or CaO：0-10%；And/or SrO：0-5%；And/or Li₂O：0-5%；And/or Na₂O：2- 12%；And/or K₂O：2-12%；And/or Sb₂O₃：0-0.5%.

(1)SiO₂+B₂O₃：30-45%；

(2)TiO₂+ZnO：12-27%；

(3)BaO/TiO₂：2-5；

(4)(MgO+CaO+SrO+BaO)/ZnO：1-4.4；

(5)Li₂O+Na₂O+K₂O：4-14%；

(6)ZnO/(Li₂O+Na₂O+K₂O)：0.8-3.5.

Further, wherein：Nb₂O₅：0-3%；And/or ZrO₂：2-9%；And/or BaO：20-38%；And/or Na₂O： 5-10%；And/or K₂O：5-10%.

Further, wherein：TiO₂+ZnO：15-25%；And/or BaO/TiO₂：2.5-4.5；And/or (MgO+CaO+SrO +BaO)/ZnO：1.5-2.4；And/or ZnO/ (Li₂O+Na₂O+K₂O)：1-3.

Further, the refractive index of glass is 1.60-1.70, and Abbe number 40-50, the water-fast effect of powder method of glass is surely Qualitative is more than 2 classes.

Further, the crystallization ceiling temperature of glass is less than 1120 DEG C, and the transmittance of glass reaches corresponding when 80% Wavelength X₈₀For below 410nm, glass transformation temperature is less than 600 DEG C.

Further, the refractive index of glass is 1.62-1.69, and Abbe number 41-48, the water-fast effect of powder method of glass is surely Qualitative is more than 1 class.

Further, the crystallization ceiling temperature of glass is less than 1090 DEG C, and the transmittance of glass reaches corresponding when 80% Wavelength X₈₀For below 400nm, glass transformation temperature is less than 580 DEG C.

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

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

Optical instrument, it is made of above-mentioned optical glass.

The beneficial effects of the invention are as follows：The present invention does not contain Nb even in reduction₂O₅On the premise of, by optimizing alkali metal, alkali Earth metal, ZnO and TiO₂Content, obtain the glass that cost is cheap, chemical stability is good, crystallization property is excellent, light Learning glass has 1.60-1.70 refractive index, 40-50 Abbe number, can be widely applied to be imaged, project, telecommunication, optics In Communication Engineering and laser technology application field, the needs of Modern New photovoltaic are disclosure satisfy that.

Embodiment

Ith, optical glass

The optical glass of the present invention does not contain expensive component even based on the consideration to reducing production cost, reduction Content, it is 1.60-1.70 to obtain refractive index (nd), and Abbe number (vd) is the excellent optical glass of 40-50 chemical stability.

The composition of the optical glass of the present invention is described in detail below, the content of each glass ingredient, total content do not have such as There is special instruction, then all represented using percentage by weight.In addition, in the following description, mention below setting or setting During the above, also including the setting.

[necessary component and optional Component]

SiO₂It is glass former oxide, the viscosity of glass can be increased and improve devitrification resistance and weatherability, when it contains When measuring less than 20%, the chemical stability of glass deteriorates；If its content more than 50%, is difficult to maintain the optics needed for target normal Number, and found difficulty increase.Therefore, SiO₂Content be defined to 20-50%, further preferred content is 25-45%.

A small amount of B is added in the present invention₂O₃, the meltbility of glass can be increased.Work as B₂O₃When content is more than 15%, glass Chemical stability be deteriorated, devitrification resistance deteriorate, therefore, B in optical glass of the present invention₂O₃Content be 0-15%, preferably 0- 10%, more preferably 0-5%.

In the present invention, B₂O₃And SiO₂As Network former, having reduces glass refraction and dispersion, improves glass The effect of devitrification resistance energy.If B₂O₃And SiO₂Total amount (B₂O₃+SiO₂) be less than 25%, then the resistance to crystallization stability of glass Design requirement is not reached；And work as B₂O₃+SiO₂During higher than 55%, the optical constant of glass is difficult to reach requirement.Therefore, it is of the invention It is preferred that B₂O₃+SiO₂Control is in 25-55%, more preferably 30-45%.

Al₂O₃It can improve and form the chemical stability of glass, but when its content is more than 10%, the dispersion increase of glass, melting Property be deteriorated.Therefore, Al of the present invention₂O₃Content be 0-10%, preferably 0-5%.

TiO₂Have the function that to improve glass refraction, and glass network can be participated in and formed, appropriate introduce can strengthen glass The devitrification resistance energy of glass, but glass dispersion can dramatically increase after introducing, while the transmission of the shortwave part of glass visible region Rate reduces, the tendency increase of glass coloration.Therefore, TiO of the present invention₂Content be 1-15%, more preferably 5-10%.

WO₃It can play a part of improving refractive index, but when its content is more than 10%, dispersion improves significantly, and glass The decrease in transmission of the short wavelength side of glass visible region, the tendency increase of coloring.Therefore, WO of the present invention₃Content be 0- 10%, preferably 0-5%.

Nb₂O₅Also have the function that to improve glass refraction and dispersion, while also there is the devitrification resistance for improving glass and change Learn the effect of stability.If its content is more than 15%, glass dispersion rise, the optics for being unable to reach glass of the present invention is special Property, while glass devitrification resistance can deteriorate.Therefore, Nb₂O₅Content range be 0-15%, preferred content 0-8%, further Preferably 0-3%.

ZrO₂The refractive index of glass can be lifted in glass and adjust dispersion by adding.Appropriate ZrO₂Add in glass, can be with Lift the devitrification resistance energy of glass.In the present invention, if its content is higher than 10%, one side glass can become to be difficult to melt, and hold It is easily caused inside glass and field trash and transmitance decline occurs, on the other hand, the devitrification resistance of glass can declines.Therefore, ZrO₂Content is 0-10%, preferably 1-10%, more preferably 2-9%.

The present invention can contain a certain amount of La₂O₃, the devitrification resistance property of glass can be effectively improved, and improve glass Chemical stability, while be advantageous to adjust the refractive index of glass to desired scope.Work as La₂O₃When content is more than 10%, glass Crystallization property is deteriorated, therefore, La in the present invention₂O₃Content be defined to 0-10%, preferably 0-5%.

Gd₂O₃Helpful for increase refractive index reduction dispersion, its part substitutes La₂O₃Glass devitrification resistance can be lifted Energy and chemical stability, but expensive cost of material limits Gd₂O₃Use in glass.Therefore, Gd₂O₃Content be 0-10%, preferably 0-5%, are not contained more preferably.

Glass of the present invention may be incorporated into Y₂O₃, to improve the meltbility of glass, devitrification resistance, while glass can also be reduced Glass crystallization ceiling temperature, lifted chemical durability of glass, if but its content more than 10%, the stability and devitrification resistance of glass Reduce.Therefore, Y₂O₃Content range is 0-10%, preferred scope 0-5%.

Yb₂O₃And glass can be with addO-on therapy, when its content is more than 10%, stability, the devitrification resistance drop of glass It is low.Therefore, Yb₂O₃Content range is defined to 0-10%, preferably 0-5%, does not introduce further preferably.

ZnO can reduce the transition temperature of glass, adjust refractive index and the dispersion of glass, improve the devitrification resistance of glass Energy, lift the chemical stability of glass.When ZnO content is less than 2%, it is impossible to play these effects；If its content is higher than When 20%, the devitrification resistance of glass can decline, while high temperature viscosity is smaller, and difficulty is brought to shaping.Therefore, under ZnO content 2% is defined to, preferred lower limit 5%；ZnO upper content limit is defined to 20%, preferred upper limit 18%.

The present inventor is by lot of experiments discovery, ZnO and TiO₂Presence can improve the devitrification resistance energy of glass. As ZnO and TiO₂Total amount (ZnO+TiO₂) it is too small when, be not enough to maintain glass devitrification resistance energy；Work as ZnO+TiO₂Contain Amount is too big, glass dispersion increase, is not enough to maintain required optical constant, therefore ZnO+TiO₂Scope is defined to 9-30%, excellent Elect 12-27%, more preferably 15-25% as.

BaO is to improve glass refraction, improve the composition of glass transmitance.When its content is excessive, then it can make the anti-of glass Crystallization property and chemical stability are deteriorated.Therefore, its content is defined to 15-50%, preferably 18-45%, further preferred model Enclose for 20-38%.

The present inventor concentrates on studies discovery, BaO and TiO₂Between when certain proportionate relationship be present, be just advantageous to obtain saturating Cross the glass that rate is high and chemical stability is good.As BaO and TiO₂Ratio (BaO/TiO₂) be less than 1 when, one side Glass optical Constant is unsatisfactory for requiring, the shortwave transmitance of another aspect glass deteriorates；And work as BaO/TiO₂It is a large amount of in glass during more than 7.5 Existing BaO enables glass devitrification resistance to reduce.Therefore, BaO/TiO₂Scope is 1-7.5, preferably BaO/TiO₂For 2-5, enter One step is preferably 2.5-4.5.

CaO helps to lift the refractive index of glass, and it, which substitutes part BaO, can be added to glass scope.But if CaO was added When more, glass devitrification resistance can be caused to decline.Therefore, CaO content limits 0-15%, preferably 0-10%.

SrO is added to the refractive index and Abbe number that glass can be adjusted in glass, if but addition it is excessive, the change of glass is steady Performance and devitrification resistance be able to can decline, while the cost of glass also can rapid increase.Therefore, SrO contents are defined to 0-10%, Preferably 0-5%, do not contain more preferably.

MgO although contribute to lifted glass chemical stability, if but content it is excessive, the refractive index of glass does not reach design It is required that the devitrification resistance of glass be able to can decline with chemical stability, while the cost of glass can rapid increase.Therefore, content of MgO 0-10%, preferably 0-5% are defined to, is not added more preferably.

BaO, SrO, CaO, MgO belong to alkaline earth oxide, and it can adjust the refractive index of glass and dispersion, reduce glass The high temperature viscosity of glass.However, when its addition is excessive, obvious evil can just occurs in the chemical stability and devitrification resistance of glass Change.Through inventor study find, when BaO, SrO, CaO and MgO total content and ZnO content ratio (BaO+SrO+CaO+ MgO when)/ZnO is less than 0.5, the optical constant of glass is difficult to meet to require, when (BaO+SrO+CaO+MgO)/ZnO is more than 9, The excessive free oxygen that alkaline-earth metal introduces is beyond Zn²⁺Constraint ability, so as to which unnecessary free oxygen causes the network knot of glass Structure is destroyed, and the devitrification resistance energy and chemical stability of glass are deteriorated.Therefore, (BaO+SrO+CaO+MgO)/ZnO model Enclose and be limited to 0.5-9, further preferred scope is 1-4.4, is still more preferably 1.5-2.4.

Li as alkali metal oxide₂O、Na₂O and K₂O, Glass optical data can be adjusted, improve glass melting effect Fruit, make glass that there is low transition temperature.Work as Li₂O、Na₂O and K₂O total content (Li₂O+Na₂O+K₂It is this when O) being less than 2% DeGrain, but work as Li₂O+Na₂O+K₂When O total content is more than 18%, the chemical stability of glass reduces.Therefore, originally Invent Li₂O+Na₂O+K₂O total content is limited in 2-18%, preferred scope 4-14%.

In alkali metal oxide, Li₂O plays the role of very big, but its raw material for reducing glass transformation temperature Cost is of a relatively high, and large-scale production is uneconomical, therefore its content is limited to less than 10%, further preferably control 5% with Under.

Na₂O、K₂O is for adjustment optical data, improves the meltbility of glass, reduces the transition temperature of glass and add, But in order to keep devitrification resistance and chemical stability, Na₂O、K₂O amount should be respectively lower than 15%.Therefore, Na₂O、K₂O's contains Amount scope is defined to 0-15%, preferably 2-12%, more preferably 5-10% respectively.

The present inventor is by concentrate on studies discovery, ZnO and Li₂O+Na₂O+K₂It is just favourable when certain ratio between O be present In obtaining, chemical stability is good, the low glass of glass transformation temperature.When ZnO content and Li₂O、Na₂O、K₂The ratio of O total content Value ZnO/ (Li₂O+Na₂O+K₂When O) being less than 0.3, although advantageously reducing the transition temperature of glass, the chemically stable of glass Property deteriorate；And work as ZnO/ (Li₂O+Na₂O+K₂When O) being more than 4, the optical data of one side glass is difficult to meet to require, the opposing party Surface glass becomes infusibility, and the devitrification resistance of glass can also can be deteriorated.Therefore, the present invention limits ZnO/ (Li₂O+Na₂O+K₂O) scope For 0.3-4, preferably 0.8-3.5, more preferably 1-3.

By adding Sb on a small quantity₂O₃Component, can improve the clarifying effect of glass, but work as Sb₂O₃When content is more than 1%, glass Glass has the tendency of Clarification Performance reduction, simultaneously because its strong oxidation promotes the deterioration of mould, it is therefore, of the invention Sb₂O₃Addition be 0-1%, preferably 0-0.5%.

[component that should not contain]

Do not damage the present invention glass performance in the range of, 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 contain on a small quantity independent or compoundly In the case of, glass is also subject to coloration, and the specific wavelength in visible region produces absorption, can so as to weaken the raising of the present invention 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 requires, excellent Choosing does not include actually.P₂O₅Introducing can reduce the chemical stability of glass, therefore P is not preferably contained in the present invention₂O₅.Fluorine Compound is introduced into actual production process, can discharge fluoride gas and dust, increases carrying capacity of environment and processing cost, this hair F is not preferably contained in bright glass.

Pb, Th, Cd, Tl, Os, Be and Se cation, there is 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 paying attention to the influence of environment, in addition to being inevitably mixed into, preferably actually not Contain them.Thus, optical glass of the present invention does not include the material of pollution environment actually.Therefore, though do not take it is special Measure in environmental cure, optical glass of the invention also can be manufactured, processed and discarded.

Below, the performance of the optical glass of the present invention is illustrated.

[optical constant of optical glass]

From the point of view of optical characteristics of the optical glass of the present invention from imparting suitable for its purposes, glass refraction (nd) Scope is 1.60-1.70, and preferable scope is 1.62-1.69；Abbe number (the ν of glass of the present invention_d) scope be 40-50, it is excellent It is 41-48 to select scope.

[crystallization property of optical glass]

The crystallization property of glass is determined using temperature gradient furnace method, glass is made to 180*10*10mm sample, side polishes, It is put into the stove inside holding with thermograde to take out after 4 hours, crystal occur in sight glass crystallization situation, glass under the microscope Corresponding maximum temperature is the crystallization ceiling temperature of glass.The crystallization ceiling temperature of optical glass of the present invention be 1120 DEG C with Under, preferably less than 1090 DEG C, more preferably less than 1070 DEG C.

[water-resistant stability of optical glass]

Powder method is water-fast to act on stability (D_W) testing standard is as follows：

According to GB/T17129-1997 method of testing, calculated according to following formula and leach percentage

D_W=(B-C)/(B-A) × 100%

Wherein：

D_W- glass leaches percentage (%)；

The quality (g) of B- filters and sample；

The quality (g) of sample after C- filters and erosion；

A- filter qualities (g).

It is six classes by the water-fast effect analysis of stability of optical glass according to the leaching percentage drawn：

The water-fast effect stability (D of powder method of the glass of the present invention_W) it is more than 2 classes, preferably more than 1 class.

[coloring of optical glass]

The shortwave transmitted spectrum characteristic degree of staining (λ of glass of the present invention₈₀) represent.λ₈₀Refer to that glass transmittance reaches Corresponding wavelength when 80%, wherein, λ₈₀Measure be to use the thickness with two parallel to each other and optical polish relative planes The glass for 10 ± 0.1nm is spent, the spectral transmission in the wavelength domain from 280nm to 700nm is determined and shows transmissivity 80% wavelength.So-called spectral transmission or transmissivity are in the vertically incident intensity I of the above-mentioned surface to glass_inLight, thoroughly Cross glass and project intensity I from a plane_outLight in the case of pass through I_out/I_inThe amount of expression, and also contains glass Above-mentioned surface on surface reflection loss transmissivity.The refractive index of glass is higher, and surface reflection loss is bigger.Therefore, exist In glass of high refractive index, λ₈₀Value it is small mean glass itself coloring it is few.

The optical glass λ of the present invention₈₀Less than or equal to 410nm, preferably λ₈₀Less than or equal to 400nm, using the teaching of the invention it is possible to provide form The optical element of the excellent imaging optical system of colour balance or projection optics system, can also make imaging optical system and projection Optical system minimizes.Based on this, optical glass of the invention is adapted as forming imaging optical system and projection optics system Optical element material.

[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 intersection point that its low-temperature region and high-temperature area straight line portion extended line intersect.

The transition temperature (Tg) of glass of the present invention is below 600 DEG C, preferably less than 590 DEG C, more preferably less than 580 DEG C.

IIth, optical precast product and optical element

The present invention also provides a kind of optical glass prefabricated component and optical element, by above-mentioned optical glass according to art technology Method is formed known to personnel, and described optical precast product and optical element can apply to digital camera, numeral is taken the photograph The equipment such as camera, camera cell phone.

IIIth, optical instrument

The optical element that optical glass of the present invention is formed can be used for all kinds of optical instruments, by using one or more light Learn element and form optical component or optical module, thrown available for such as imaging device, sensor, microscope, medical science, numeral Optics/illumination, photoetching technique in shadow, communication, optical communication technique/information transfer, automotive field, stepper, quasi-molecule swash Light device, chip, computer chip and integrated circuit and electronic device including such circuit and chip.

The present invention relates to the application of the optical component or optical module produced using above-mentioned optical element, the optical section Part or optical module can be used for such as sensor, microscope, medical science, digital projection, communication, optical communication technique/information Optics/illumination, photoetching technique, stepper, excimer laser, chip, computer chip and bag in transmission, automotive field Include the integrated circuit and electronic device of such circuit and chip.

[embodiment]

The present invention is further expalined 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 using well known to a person skilled in the art technology.Glass is former Material (carbonate, nitrate, sulfate, hydroxide, oxide, boric acid etc.) is weighed with merging according to the proportioning of glass oxide After well mixed, put into smelting apparatus (such as platinum crucible), then taken at 1150~1400 DEG C appropriate stirring, clarification, After homogenizing, less than 1250 DEG C are cooled to, cast or leakage note are in mould, the post-processing such as last annealed, processing, or It is molded by precise compression molding technology direct pressing.

[optical glass embodiment]

By the characteristic of each glass of the method measure present invention as shown below, and measurement result is represented in 1~table of table 3 In,

(1) refractive index nd and Abbe number ν d

Refractive index is tested with Abbe number according to method as defined in GB/T7962.1-2010.

(2) glass coloration degree (λ₈₀)

Use the glass sample that the thickness with two optical polish planes relative to each other is 10 ± 0.1mm, measure point Light transmission, it is calculated according to its result.

(3) devitrification of glass ceiling temperature

Measured by method noted earlier.

(4) chemical stability D_W

Measure by GB/T 17129 method of testing, calculated according to formula.

(5) glass transformation temperature (Tg)

Method measures as defined in GB/T7962.16-2010.

Table 1

Table 2

Table 3

[optical precast product embodiment]

Optical glass obtained by embodiment 1 in table 1 is cut into predefined size, then is equably coated with by nitrogen on the surface Change the releasing agent that boron powder is formed, be then heated, soften, be press-formed, make recessed meniscus shaped lens, convex falcate The various lens such as lens, biconvex lens, biconcave lens, planoconvex spotlight, plano-concave lens, the prefabricated component of prism.

[optical element embodiment]

These prefabricated components obtained by above-mentioned optical precast product embodiment are annealed, are reducing the same of the deformation of inside glass 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 chemical stability is good, crystallization property is excellent and transmitance is good optical glass, refractive index 1.60- 1.70, Abbe number 40-50, and the optical element that the glass is formed, disclosure satisfy that the needs of Modern New photovoltaic.

Claims

1. optical glass, it is characterised in that its composition represents by weight percentage, contains：SiO₂：20-50%；B₂O₃：0- 15%；TiO₂：1-15%；ZnO：2-20%；BaO：15-50%.

2. optical glass as claimed in claim 1, it is characterised in that also contain：Al₂O₃：0-10%；WO₃：0-10%；ZrO₂： 0-10%；Nb₂O₅：0-15%；La₂O₃：0-10%；Gd₂O₃：0-10%；Y₂O₃：0-10%；Yb₂O₃：0-10%；MgO：0- 10%；CaO：0-15%；SrO：0-10%；Li₂O：0-10%；Na₂O：0-15%；K₂O：0-15%；Sb₂O₃：0-1%.

3. optical glass, it is characterised in that its composition is expressed as by weight percentage：SiO₂：20-50%；B₂O₃：0-15%； TiO₂：1-15%；ZnO：2-20%；BaO：15-50%；Al₂O₃：0-10%；WO₃：0-10%；ZrO₂：0-10%；Nb₂O₅：0- 15%；La₂O₃：0-10%；Gd₂O₃：0-10%；Y₂O₃：0-10%；Yb₂O₃：0-10%；MgO：0-10%；CaO：0-15%； SrO：0-10%；Li₂O：0-10%；Na₂O：0-15%；K₂O：0-15%；Sb₂O₃：0-1%.

4. the optical glass as described in claim 1-3 any claims, it is characterised in that the content of each component meets following One or more in 6 kinds of situations：

(1)SiO₂+B₂O₃：25-55%；

(2)TiO₂+ZnO：9-30%；

(3)BaO/TiO₂：1-7.5；

(4)(MgO+CaO+SrO+BaO)/ZnO：0.5-9；

(5)Li₂O+Na₂O+K₂O：2-18%；

(6)ZnO/(Li₂O+Na₂O+K₂O)：0.3-4.

5. the optical glass as described in claim 1-3 any claims, it is characterised in that wherein：SiO₂：25-45%；With/ Or B₂O₃：0-10%；And/or TiO₂：5-10%；And/or ZnO：5-18%；And/or BaO：18-45%；And/or Al₂O₃：0- 5%；And/or WO₃：0-5%；And/or ZrO₂：1-10%；And/or Nb₂O₅：0-8%；And/or La₂O₃：0-5%；And/or Gd₂O₃：0-5%；And/or Y₂O₃：0-5%；And/or Yb₂O₃：0-5%；And/or MgO：0-5%；And/or CaO：0-10%；With/ Or SrO：0-5%；And/or Li₂O：0-5%；And/or Na₂O：2-12%；And/or K₂O：2-12%；And/or Sb₂O₃：0- 0.5%.

6. the optical glass as described in claim 1-3 any claims, it is characterised in that the content of each component meets following One or more in 6 kinds of situations：

(1)SiO₂+B₂O₃：30-45%；

(2)TiO₂+ZnO：12-27%；

(3)BaO/TiO₂：2-5；

(4)(MgO+CaO+SrO+BaO)/ZnO：1-4.4；

(5)Li₂O+Na₂O+K₂O：4-14%；

(6)ZnO/(Li₂O+Na₂O+K₂O)：0.8-3.5.

7. the optical glass as described in claim 1-3 any claims, it is characterised in that wherein：Nb₂O₅：0-3%；With/ Or ZrO₂：2-9%；And/or BaO：20-38%；And/or Na₂O：5-10%；And/or K₂O：5-10%.

8. the optical glass as described in claim 1-3 any claims, it is characterised in that wherein：TiO₂+ZnO：15- 25%；And/or BaO/TiO₂：2.5-4.5；And/or (MgO+CaO+SrO+BaO)/ZnO：1.5-2.4；And/or ZnO/ (Li₂O+ Na₂O+K₂O)：1-3.

9. the optical glass as described in claim 1-3 any claims, it is characterised in that the refractive index of glass is 1.60- 1.70, Abbe number 40-50, the water-fast effect stability of powder method of glass is more than 2 classes.

10. the optical glass as described in claim 1-3 any claims, it is characterised in that the crystallization ceiling temperature of glass For less than 1120 DEG C, the transmittance of glass reaches corresponding wavelength X when 80%₈₀For below 410nm, glass transformation temperature 600 Below DEG C.

11. the optical glass as described in claim 1-3 any claims, it is characterised in that the refractive index of glass is 1.62- 1.69, Abbe number 41-48, the water-fast effect stability of powder method of glass is more than 1 class.

12. the optical glass as described in claim 1-3 any claims, it is characterised in that the crystallization ceiling temperature of glass For less than 1090 DEG C, the transmittance of glass reaches corresponding wavelength X when 80%₈₀For below 400nm, glass transformation temperature 580 Below DEG C.

13. gas preform, it is made of the optical glass described in claim 1-12 any claims.

14. optical element, it is made of the optical glass described in claim 1-12 any claims.

15. optical instrument, it is made of the optical glass described in claim 1-12 any claims.