CN110316960A - Optical glass, gas preform, optical element and optical instrument - Google Patents

Abstract

The present invention provides a kind of optical glass, and the optical glass component in terms of weight percentage, contains: SiO₂: 41~58%；TiO₂: 18~32%；Na₂O:3~18%；K₂O:2~15%；BaO:2~15%；SrO:0~10%；CaO:0~10%；MgO:0~10%, wherein BaO/RO is 0.5~1.0, and the RO is total content of BaO, SrO, CaO, MgO.It designs and matches by reasonable component, optical glass of the present invention has suitable hardness and excellent chemical stability while meeting desired refractive index and Abbe number, meets the application in the fields such as vehicle-mounted, monitoring security protection.

Description

Optical glass, gas preform, optical element and optical instrument

Technical field

The present invention relates to a kind of optical glass, be 1.62~1.71 more particularly, to a kind of refractive index, Abbe number be 28~ 36 optical glass.

Background technique

In recent years, with the quick universal and use of digital camera, video camera and camera mobile phone, so that optical material It is rapidly developed towards the direction of high precision int, miniaturization.Continuous the merging of optics and electronic information science, new material science, makees It advances by leaps and bounds for the optical glass of photoelectron basic material in the application of the technical fields such as optical transport, light storage and photoelectric display. In recent years, optical element and optical instrument are quickly grown in terms of digitlization, integrated and High precision, to for optical instrument More stringent requirements are proposed with the performance of the optical glass of the optical element of equipment.

The optical glass that refractive index is 1.62~1.71, Abbe number is 28~36 is right in optical design and optical communication field Simplifying optical system raising image quality has great significance.The optical glass for meeting the optical property at present can be applied to vehicle It carries, monitor the fields such as security protection, this requires optical glass hardness with higher, to resist the mill of sandstone in vehicle travel process Damage, extends the service life of optical glass.Optical glass will receive various liquid (such as acid, alkali, water in environment in use Deng) erosion, therefore the resistivity that optical glass corrodes these, the i.e. chemical stability of optical glass make instrument It is most important with precision and service life.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of optics with superior chemical stability and higher hardness Glass.

The technical proposal for solving the technical problem of the invention is: optical glass, component in terms of weight percentage, Contain: SiO₂: 41~58%；TiO₂: 18~32%；Na₂O:3~18%；K₂O:2~15%；BaO:2~15%；SrO:0~ 10%；CaO:0~10%；MgO:0~10%, wherein BaO/RO is 0.5~1.0, and the RO is the conjunction of BaO, SrO, CaO, MgO Count content.

Further, above-mentioned optical glass, component in terms of weight percentage, also contain: B₂O₃: 0~10%； Ln₂O₃: 0~5%；Nb₂O₅: 0~8%；ZrO₂: 0~5%；Li₂O:0~5%；Al₂O₃: 0~5%；ZnO:0~5%；Clarification Agent: 0~1%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or a variety of, clarifying agent Sb₂O₃、SnO₂、 SnO、CeO₂One of or it is a variety of.

Optical glass, component is in terms of weight percentage are as follows: SiO₂: 41~58%；TiO₂: 18~32%；Na₂O:3~ 18%；K₂O:2~15%；BaO:2~15%；SrO:0~10%；CaO:0~10%；MgO:0~10%；B₂O₃: 0~10%； Ln₂O₃: 0~5%；Nb₂O₅: 0~8%；ZrO₂: 0~5%；Li₂O:0~5%；Al₂O₃: 0~5%；ZnO:0~5%；Clarification Agent: 0~1%, wherein BaO/RO is 0.5~1.0, and the RO is total content of BaO, SrO, CaO, MgO, Ln₂O₃For La₂O₃、 Gd₂O₃、Y₂O₃、Yb₂O₃One of or a variety of, clarifying agent Sb₂O₃、SnO₂、SnO、CeO₂One of or it is a variety of.

Further, above-mentioned optical glass, component is in terms of weight percentage, in which: SiO₂: 42~55%；With/ Or TiO₂: 20~30%；And/or Na₂O:5~16%；And/or K₂O:3~12%；And/or BaO:3~12%；And/or SrO:0 ~5%；And/or CaO:0~5%；And/or MgO:0~5%；And/or B₂O₃: 0~5%；And/or Ln₂O₃: 0~3%；And/or Nb₂O₅: 0~6%；And/or ZrO₂: 0~3%；And/or Li₂O:0~3%；And/or Al₂O₃: 0~3%；And/or ZnO:0~ 3%；And/or clarifying agent: 0~0.5%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or it is a variety of, it is clear Clear agent is Sb₂O₃、SnO₂、SnO、CeO₂One of or it is a variety of.

Further, above-mentioned optical glass, component is in terms of weight percentage, in which: BaO/RO is 0.7~1.0； And/or TiO₂/SiO₂It is 0.35~0.75；And/or B₂O₃/SiO₂It is 0.15 or less；And/or Na₂O/(Na₂O+K₂O) for 0.3~ 0.85；And/or Nb₂O₅/TiO₂For 0.3 hereinafter, wherein RO is total content of BaO, SrO, CaO, MgO.

Further, above-mentioned optical glass, component is in terms of weight percentage, in which: SiO₂: 43~50%；With/ Or TiO₂: 22~28%；And/or Na₂O:8~14%；And/or K₂O:4~10%；And/or BaO:5~11%；And/or SrO:0 ~3%；And/or CaO:0~3%；And/or MgO:0~3%；And/or B₂O₃: 0~3%；And/or Ln₂O₃: 0~1%；And/or Nb₂O₅: 0~3%；And/or ZrO₂: 0~2%；And/or Li₂O:0~2%；And/or Al₂O₃: 0~1%；And/or ZnO:0~ 1%；And/or Sb₂O₃: 0~0.5%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or it is a variety of.

Further, above-mentioned optical glass, component is in terms of weight percentage, in which: BaO/RO is 0.8~1.0； And/or TiO₂/SiO₂It is 0.4~0.7；And/or B₂O₃/SiO₂It is 0.1 or less；And/or Na₂O/(Na₂O+K₂It O) is 0.4~0.8； And/or Nb₂O₅/TiO₂For 0.2 hereinafter, wherein RO is total content of BaO, SrO, CaO, MgO.

Further, above-mentioned optical glass, component is in terms of weight percentage, in which: TiO₂/SiO₂For 0.45~ 0.6；And/or B₂O₃/SiO₂It is 0.05 or less；And/or Na₂O/(Na₂O+K₂It O) is 0.5~0.75；And/or Nb₂O₅/TiO₂For 0.1 or less.

Further, Li is not contained in its component of above-mentioned optical glass₂O；And/or ZrO is not contained₂；And/or it does not contain ZnO；And/or WO is not contained₃；And/or B is not contained₂O₃。

Further, above-mentioned optical glass, component in terms of weight percentage, TiO₂、SiO₂、Na₂O、K₂O and BaO Total content be 95% or more, preferably TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 97% or more, more preferably TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 98% or more.

Further, the refractive index nd of above-mentioned optical glass is 1.62~1.71, preferably 1.63~1.70, more preferably It is 1.64~1.69；Abbe number ν_dIt is 28~36, preferably 29~35, more preferably 30~34.

Further, the acidproof effect stability D of above-mentioned optical glass_AMore than 2 classes, preferably 1 class；And/or it is resistance to Water acts on stability D_WMore than 2 classes, preferably 1 class；And/or density p is 3.1g/cm³Hereinafter, preferably 3.0g/cm³Hereinafter, More preferably 2.95g/cm³Below；And/or thermalexpansioncoefficientα_-30/70℃It is 98 × 10^-7/ K is hereinafter, preferably 95 × 10^-7/ K with Under, more preferably 90 × 10^-7/ K or less；And/or transition temperature T_gFor 610 DEG C hereinafter, preferably 600 DEG C hereinafter, more preferably 595 DEG C or less；And/or Knoop hardness H_KIt is 520 × 10⁷Pa or more, preferably 540 × 10⁷Pa or more, more preferably 550 × 10⁷Pa or more.

Gas preform is made of above-mentioned optical glass.

Optical element is made of above-mentioned optical glass or above-mentioned gas preform.

Optical instrument is made of above-mentioned optical glass or above-mentioned optical element.

The beneficial effects of the present invention are: designing and matching by reasonable component, optical glass of the present invention is meeting expectation Refractive index and while Abbe number, there is suitable hardness and excellent chemical stability, meet the necks such as vehicle-mounted, monitoring security protection The application in domain.

Specific embodiment

In the following, the embodiment of optical glass of the invention is described in detail, but the present invention is not limited to following realities Mode is applied, change appropriate can be carried out in the range of the object of the invention to be implemented.In addition, about repetitive specification, Although there is the case where omitting the description appropriate, but not therefore limit the purport invented.Sometimes this is sent out in the following contents Bright optical glass is referred to as glass.

[optical glass]

The each component range of optical glass of the present invention is illustrated below.In the present specification, if without special theory Bright, the content of each component is all using the weight percent table of the glass substance total amount relative to the composition for being converted into oxide Show.Herein, described " composition for being converted into oxide " refers to, as optical glass constituent of the invention raw material and make In the case that oxide, complex salt and hydroxide etc. decompose when melting and are changed into oxide, by the object of the oxide Matter total amount is as 100%.

Unless in particular situations it is further noted that numberical range listed herein includes upper and lower bound value, " more than " " following " includes endpoint value, and including all integers and score in the range, and is not limited to limited range when institute The occurrence of column.Herein referred "and/or" is inclusive, such as " A and/or B ", refers to only A, or only B, Huo Zhetong When have A and B.

<necessary component and optional components>

SiO₂It is the skeleton of optical glass, generates body as glass network, has and maintain chemical durability of glass, improve glass The effect of glass devitrification resistance.Work as SiO₂When content is lower than 41%, it is difficult to reach said effect, therefore SiO₂The lower limit of content be 41%, preferred lower limit 42%, more preferable lower limit is 43%；Work as SiO₂Content be higher than 58% when, then glass melting reduce, Transition temperature rises, therefore, SiO₂Upper content limit be 58%, preferred upper limit 55%, the more preferable upper limit be 50%.

TiO₂Have the function of improving glass refraction and dispersion, and glass network can be participated in and formed, appropriate introduce can Keep glass more stable and reduce the viscosity of glass, passes through the TiO of 18% or more introducing in the present invention₂It is excellent to obtain said effect Select TiO₂Content lower limit be 20%, more preferable lower limit be 22%；But largely introduce TiO₂It can make glass visible light region afterwards The tendency towards devitrification of the decrease in transmission of shortwave part, glass increases, therefore, TiO in the present invention₂Upper content limit be 32%, it is excellent It chooses and is limited to 30%, the more preferable upper limit is 28%.

In certain embodiments of the present invention, if TiO₂/SiO₂Lower than 0.35, the meltbility of glass is reduced, and striped degree becomes Difference, if TiO₂/SiO₂More than 0.75, the chemical stability and optical transmittance of glass decline, and density rises, therefore in the present invention TiO₂/SiO₂It is 0.35~0.75, preferably TiO₂/SiO₂It is 0.4~0.7, more preferable TiO₂/SiO₂It is 0.45~0.6.

Na₂O has the function of improving glass melting have apparent effect for improving melted effect, while may be used also The transition temperature of glass is reduced, the Na of 3% or more introducing is led in the present invention₂O is to obtain said effect, preferably Na₂Under the content of O It is limited to 5%, more preferable lower limit is 8%；Work as Na₂O content is more than 18%, and the chemical stability and weatherability of glass reduce, therefore Na₂The upper content limit of O is 18%, preferred upper limit 16%, and the more preferable upper limit is 14%.

K₂O has the function of improvement thermal stability and meltbility, passes through the K of 2% or more introducing in the present invention₂O is to obtain Obtain said effect, preferably K₂The content lower limit of O is 3%, more preferable K₂The content lower limit of O is 4%；But work as K₂The content of O is more than 15%, the devitrification resistance decline of glass, therefore K₂The upper content limit of O is 15%, preferred upper limit 12%, and the more preferable upper limit is 10%.

In certain embodiments of the present invention, if Na₂O/(Na₂O+K₂O) it is lower than 0.3, the devitrification resistance of glass is deteriorated, If Na₂O/(Na₂O+K₂O) more than 0.85, the thermal stability and striped degree of glass are reduced, therefore preferred Na₂O/(Na₂O+K₂O) it is 0.3~0.85, more preferable Na₂O/(Na₂O+K₂It O) is 0.4~0.8.In some embodiments, by controlling Na₂O/(Na₂O+ K₂O) in 0.5~0.75 range, the thermal expansion coefficient of glass, therefore further preferred Na can also be improved₂O/(Na₂O+K₂O) it is 0.5~0.75.

Li₂O can reduce the transition temperature of glass, but its content height to the acid-resistant stability and thermal expansion coefficient of glass not Benefit, and there is corrosion, therefore, Li for container (such as platinum crucible) is melted₂The content of O is preferably 5% hereinafter, more preferably 3% hereinafter, further preferably 2% or less.In some embodiments, even if a small amount of contains Li₂O also results in glass Thermal expansion coefficient exceed design requirement, devitrification resistance can reduce, therefore not contain Li still more preferably₂O。

MgO can reduce the refractive index and glass melting temperature of glass, but the refractive index of glass is not achieved when MgO is added excessive The devitrification resistance of design requirement, glass can decline with stability, while the cost of glass can rise.Therefore, content of MgO is limited to 0~10%, preferably 0~5%, more preferably 0~3%.

CaO helps to adjust the optical constant of glass, improves the processing performance of glass, but when CaO addition is excessive, can make The optical data for obtaining glass does not reach requirement, and devitrification resistance can deteriorate.Therefore, CaO content be limited to 0~10%, preferably 0~ 5%, more preferably 0~3%, CaO is not introduced further preferably.

SrO is added to the refractive index and Abbe number of adjustable glass in glass, if but additive amount it is excessive, the chemistry of glass Stability can decline, while the cost of glass also can rapid increase.Therefore, SrO content be limited to 0~10%, preferably 0~ 5%, more preferably 0~3%.

BaO is in the present invention the necessary component for adjusting glass refraction, improving glass transmitance and intensity, when its content Act on unobvious when lower than 2%, the content lower limit of preferably BaO is 3%, and the content lower limit of more preferable BaO is 5%；But when it contains Amount can then enable the devitrification resistance of glass and chemical stability be deteriorated more than 15%.Therefore, BaO upper content limit is 15%, preferably The upper limit is 12%, and the more preferable upper limit is 11%.

It can make glass of the present invention that there is the same of superior chemical stability 0.5 or more by control BaO/RO in the present invention When, glass hardness with higher, wherein RO is total content of BaO, SrO, CaO, MgO.Therefore, the range of BaO/RO is 0.5~1.0, the preferably range of BaO/RO is 0.7~1.0, in certain embodiments of the present invention, passes through more preferable BaO/RO In 0.8~1.0 range, it can also improve the striped degree of glass.

Nb₂O₅It is high-refraction high-dispersion component, is the optional components in the present invention, passes through control Nb in the present invention₂O₅Contain Amount is 8% hereinafter, can inhibit the reduction of glass devitrification resistance.Therefore, Nb in optical glass of the present invention₂O₅Content be 8% with Under, preferably 6% hereinafter, more preferably 3% or less.In some embodiments, by not containing Nb₂O₅, glass can be improved Transmitance and devitrification resistance energy.

In certain embodiments of the present invention, by by Nb₂O₅/TiO₂Control is 0.3 hereinafter, the light of glass can be improved It learns transmitance and at glass stability, optimizes the chemical stability of glass, preferably Nb₂O₅/TiO₂For 0.2 hereinafter, more preferable Nb₂O₅/ TiO₂It is 0.1 or less.

Al₂O₃The chemical stability of glass can be improved to a certain extent, but its content is excessive, the devitrification resistance of glass and Meltbility reduces, therefore its content is 5% hereinafter, preferably 3% hereinafter, more preferably 1% or less.

B₂O₃Have the function of improving glass melting, but when its content is higher than 10%, the chemical stability of glass and resistance to Increased devitrification resistance decline.Therefore, B in the present invention₂O₃Upper content limit be 10%, preferred upper limit 5%, the more preferable upper limit be 3%.? In some embodiments, by not introducing B₂O₃, can get desired chemical stability.

In certain embodiments of the present invention, if B₂O₃/SiO₂More than 0.15, the chemical stability of glass and resistance to is shown Increased devitrification resistance reduces, and optical transmittance is deteriorated, therefore B₂O₃/SiO₂For 0.15 hereinafter, preferably 0.1 hereinafter, more preferably 0.05 with Under.

Ln₂O₃It is the component for improving glass refraction and chemical stability, is the optional components in optical glass of the present invention, Wherein Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or it is a variety of.By by Ln₂O₃Content control be 5% or less energy The devitrification resistance property of glass is enough improved, and obtains desired refractive index and Abbe number.Therefore, in optical glass of the invention, Ln₂O₃The upper limit value of content range is 5%, preferred upper limit 3%, and the more preferable upper limit is 1%.

ZnO is added in system glass of the present invention, and the refractive index and dispersion of adjustable glass reduce the transformation temperature of glass Degree, but when its content is more than 5%, the devitrification resistance of glass can decline, while high temperature viscosity is smaller, difficulty is brought to molding, and Increase the thermal expansion coefficient and thermal refractive index coefficient of glass.Therefore, the present invention in ZnO content be 0~5%, preferably 0~ 3%, more preferably 0~1%, it does not contain further preferably.

ZrO₂It is with the component for improving refractive index, when its content is more, the devitrification resistance of glass declines, in the present invention ZrO₂Content be 5% hereinafter, preferably 3% hereinafter, more preferably 2% hereinafter, not introducing further preferably.

By the Sb for being added 0~1%₂O₃、SnO₂, SnO and CeO₂One of or various ingredients as clarifying agent, can be with The clarifying effect for improving glass, is preferably added to 0~0.5% clarifying agent.But work as Sb₂O₃When content is more than 1%, glass has clarification The tendency of reduced performance, simultaneously because its strong oxidation promotes the deterioration of molding die, therefore Sb of the present invention₂O₃Addition Amount is for 1% hereinafter, preferably 0.5% or less.SnO₂, SnO can also be used as clarifying agent to add, but when its content is more than 1% When, glass can colour, or when heat, soften glass and carry out die forming etc. shape again when, Sn can become nucleus and generate Starting point, generate the tendency of devitrification, therefore SnO of the invention₂With the difference content of SnO be 1% hereinafter, preferably 0.5% with Under, it does not contain further preferably.CeO₂Effect and additive amount ratio and SnO₂Unanimously, content is 1% hereinafter, preferably 0.5% hereinafter, do not contain further preferably.

To make glass of the present invention while obtaining desired hardness, the chemical stability and optical transmittance of glass are excellent Different, transition temperature and thermal expansion coefficient are low, preferably TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 95% or more, more excellent Select TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 97% or more, further preferred TiO₂、SiO₂、Na₂O、K₂O and BaO Total content be 98% or more.

In the range of not damaging glass performance of the invention, above-mentioned other groups not referred to can be added as needed Point, such as P₂O₅、GeO₂、TeO₂、Bi₂O₃、Ta₂O₅And Ga₂O₃Etc. components, but individually or mixing the content containing the above component on Limit preferably 5%, the more preferable upper limit is 3%, and the further preferred upper limit is 1%, is not contained still more preferably.In some implementations Mode exists, WO₃Introducing will lead to glass devitrification resistance can and degree of staining deteriorate, therefore preferably do not contain WO₃。

<component that should not contain>

In glass of the present invention, the oxide of the transition metal such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, even if individually Or in the case that compound ground contains on a small quantity, glass is also subject to coloration, the specific wavelength in visible light region generates absorption, thus The property for weakening raising visible light transmittance effect of the invention, therefore it is desirable, especially for the transmitance of visible light region wavelength The optical glass required, does not preferably contain actually.

The oxide of Th, Cd, Tl, Os, Be and Se have what control used to incline as harmful chemical substance in recent years To being to the measure of environmental protection in the manufacturing process of glass, the disposition after manufacturing procedure and commercialization not only must It needs.Therefore, it in the case where paying attention to the influence to environment, other than being inevitably mixed into, does not preferably contain actually They.Optical glass becomes the substance for not including pollution environment actually as a result,.Therefore, even if not taking special environment pair Measure in plan, optical glass of the invention are also able to carry out manufacture, processing and discard.

Environmental-friendly in order to realize, optical glass of the invention does not contain As₂O₃And PbO.Although As₂O₃With elimination gas Bubble and the effect for preferably preventing glass coloration, but As₂O₃Addition can increase glass smelting furnace is especially to the platinum of platinum smelting furnace Gold corrodes, and causes more platinum ions to enter glass, adversely affects to the service life of platinum smelting furnace.

" not introducing " " not containing " " 0% " described herein refers to not deliberately by the compound, molecule or element etc. It is added in optical glass of the present invention as raw material；But as the raw material and/or equipment of production optical glass, can exist certain It is not the impurity deliberately added or component, a small amount of or trace can contains in final optical glass, such situation is also in this hair In the protection scope of bright patent.

In the following, being illustrated to the performance of optical glass of the invention.

<refractive index and Abbe number>

The refractive index (nd) and Abbe number (ν of optical glass_d) tested according to method as defined in GB/T 7962.1-2010.

The refractive index (nd) of optical glass of the present invention is 1.62~1.71, preferably 1.63~1.70, more preferably 1.64 ~1.69；Abbe number ν_dIt is 28~36, preferably 29~35, more preferably 30~34.

<acidproof effect stability>

The acidproof effect stability (D of optical glass_A) (powder method) according to method as defined in GB/T 17129 test.

The acidproof effect stability (D of optical glass of the present invention_A) it is 2 classes or more, preferably 1 class.

<water-fast effect stability>

The water-fast effect stability (D of optical glass_W) (powder method) according to method as defined in GB/T 17129 test.

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

<density>

The density (ρ) of optical glass is tested by method as defined in GB/T7962.20-2010.

The density (ρ) of optical glass of the present invention is 3.1g/cm³Hereinafter, preferably 3.0g/cm³Hereinafter, more preferably 2.95g/cm³Below.

<thermal expansion coefficient>

Thermal expansion coefficient (the α of optical glass_-30/70℃) carry out testing -30 according to method as defined in GB/T7962.16-2010 ~70 DEG C of data.

Thermal expansion coefficient (the α of optical glass of the invention_-30/70℃) it is 98 × 10^-7/ K is hereinafter, preferably 95 × 10^-7/K Hereinafter, more preferably 90 × 10^-7/ K or less.

<transition temperature>

Transition temperature (the T of optical glass_g) tested by method as defined in GB/T7962.16-2010.

Transition temperature (the T of optical glass of the invention_g) be 610 DEG C hereinafter, preferably 600 DEG C hereinafter, more preferably 595 DEG C or less.

<degree of staining>

The shortwave transmitted spectrum characteristic degree of staining (λ of glass of the present invention₈₀And λ₅) indicate.λ₈₀Refer to that glass transmittance reaches Corresponding wavelength when 80%.λ₈₀Measurement be using with two parallel to each other and optical polish opposite planes with a thickness of 10 The glass of ± 0.1mm measures the spectral transmission in the wavelength domain from 280nm to 700nm and shows the wave of transmissivity 80% It is long.So-called spectral transmission or transmissivity are in the vertically incident intensity I of the above-mentioned surface to glass_inLight, simultaneously through glass Intensity I is projected from a plane_outLight in the case where pass through I_out/I_inThe amount of expression, and also contain the above-mentioned table of glass The transmissivity of surface reflection loss on face.The refractive index of glass is higher, and surface reflection loss is bigger.Therefore, in high refractive index In glass, λ₈₀The small coloring for meaning glass itself of value it is few.

Optical glass λ of the invention₈₀Less than or equal to 410nm, preferably λ₈₀For less than or equal to 405nm；λ₅It is less than or waits In 370nm, preferably λ₅For less than or equal to 365nm.

<Knoop hardness>

Knoop hardness (the H of optical glass_K) tested by test method as defined in GB/T7962.18-2010.

Knoop hardness (the H of optical glass of the present invention_K) it is 520 × 10⁷Pa or more, preferably 540 × 10⁷Pa or more, it is more excellent It is selected as 550 × 10⁷Pa or more.

<bubble degree>

The bubble degree of optical glass is by the test of method as defined in GB/T7962.8-2010.

Optical glass bubble degree of the present invention is B grades or more, preferably A grades or more, more preferably A₀Grade or more.

[manufacturing method]

The manufacturing method of optical glass of the present invention is as follows: glass of the invention is produced using conventional raw material and common process, It the use of carbonate, nitrate, sulfate, hydroxide, oxide etc. is raw material, according to a conventional method after ingredient, the furnace that will prepare Material is put into 1150~1350 DEG C of smelting furnace and is melted, and after clarified, stirring and homogenizing, obtains no bubble and be free of The homogeneous melt glass of undissolved substance casting mold and anneals this melten glass in mold.Those skilled in the art's energy Enough according to actual needs, raw material, process and technological parameter are properly selected.

[gas preform and optical element]

Molded such as the means of attrition process or reheating, compression molding precise punch forming means can be used, Gas preform is made by made optical glass.I.e., it is possible to mechanical by being ground and being ground to optical glass etc. Processing makes gas preform, or by the preform for making compression molding by optical glass, to the preform Carry out carrying out attrition process again after reheating is molded to make gas preform, or and to attrition process is carried out it is manufactured pre- Precise punch forming is carried out at parison to make gas preform.

It should be noted that the means for preparing gas preform are not limited to above-mentioned means.As described above, optics of the invention Glass is useful for various optical elements and optical design, wherein particularly preferably by optical glass of the invention formed it is pre- at Parison carries out molded, precise punch forming of reheating etc., the optical elements such as production lens, prism using the preform.

Gas preform and optical element of the invention is formed by the optical glass of aforementioned present invention.Glass of the invention Prefabricated component has excellent characteristics possessed by optical glass；Optical element of the invention has excellent spy possessed by optical glass Property, it is capable of providing the optical elements such as the costly various lens of optics, prism.

As the example of lens, can enumerate lens face be spherical surface or aspherical recessed meniscus shaped lens, male bend moon-shaped lens, The various lens such as biconvex lens, biconcave lens, plano-convex lens, plano-concave lens.

[optical instrument]

Optical glass of the present invention is formed by optical element and can make such as camera installation, picture pick-up device, display equipment and prison Control the optical instruments such as equipment.

Embodiment

<optical glass embodiment>

In order to further clearly illustrate and illustrate technical solution of the present invention, non-limiting embodiment below is provided.

The present embodiment obtains the optics glass with composition shown in 1~table of table 2 using the manufacturing method of above-mentioned optical glass Glass.In addition, the test method measures the characteristic of each glass through the invention, and measurement result is indicated in 1~table of table 2 In.

Table 1

Table 2

<gas preform embodiment>

The means of the obtained glass of optical glass Examples 1 to 20 use such as attrition process or reheating are molded, The means of the compression moldings such as precise punch forming, it is saturating to make recessed meniscus shaped lens, male bend moon-shaped lens, biconvex lens, concave-concave The prefabricated component of the various lens such as mirror, plano-convex lens, plano-concave lens, prism etc..

<optical element embodiment>

By obtained these prefabricated components annealing of 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 reach 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, plano-convex lens, plano-concave lens, prism.It can also Tu Bufang on the surface of obtained optical element Reflectance coating.

<optical instrument embodiment>

By optical element made from above-mentioned optical element embodiment by optical design, by using one or more optics Element forms optical component or optical module, can be used for such as imaging device, sensor, microscope, medical science, number and throws Shadow, communication, optical communication technique/information transmission, optics/illumination in automotive field, photoetching technique, excimer laser, crystalline substance Piece, computer chip and integrated circuit and electronic device including such circuit and chip, or taking the photograph for automotive field As equipment and device.

Claims (15)

1. optical glass, which is characterized in that its component in terms of weight percentage, contains: SiO₂: 41~58%；TiO₂: 18~ 32%；Na₂O:3~18%；K₂O:2~15%；BaO:2~15%；SrO:0~10%；CaO:0~10%；MgO:0~10%, Wherein BaO/RO is 0.5~1.0, and the RO is total content of BaO, SrO, CaO, MgO.

2. optical glass as described in claim 1, which is characterized in that its component in terms of weight percentage, also contains: B₂O₃: 0~10%；Ln₂O₃: 0~5%；Nb₂O₅: 0~8%；ZrO₂: 0~5%；Li₂O:0~5%；Al₂O₃: 0~5%；ZnO:0~ 5%；Clarifying agent: 0~1%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or it is a variety of, clarifying agent is Sb₂O₃、SnO₂、SnO、CeO₂One of or it is a variety of.

3. optical glass, which is characterized in that its component is in terms of weight percentage are as follows: SiO₂: 41~58%；TiO₂: 18~ 32%；Na₂O:3~18%；K₂O:2~15%；BaO:2~15%；SrO:0~10%；CaO:0~10%；MgO:0~10%； B₂O₃: 0~10%；Ln₂O₃: 0~5%；Nb₂O₅: 0~8%；ZrO₂: 0~5%；Li₂O:0~5%；Al₂O₃: 0~5%；ZnO: 0~5%；Clarifying agent: 0~1%, wherein BaO/RO is 0.5~1.0, and the RO is total content of BaO, SrO, CaO, MgO, Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One of or a variety of, clarifying agent Sb₂O₃、SnO₂、SnO、CeO₂One of or It is a variety of.

4. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, in which: SiO₂: 42~55%；And/or TiO₂: 20~30%；And/or Na₂O:5~16%；And/or K₂O:3~12%； And/or BaO:3~12%；And/or SrO:0~5%；And/or CaO:0~5%；And/or MgO:0~5%；And/or B₂O₃: 0~ 5%；And/or Ln₂O₃: 0~3%；And/or Nb₂O₅: 0~6%；And/or ZrO₂: 0~3%；And/or Li₂O:0~3%；And/or Al₂O₃: 0~3%；And/or ZnO:0~3%；And/or clarifying agent: 0~0.5%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、 Y₂O₃、Yb₂O₃One of or a variety of, clarifying agent Sb₂O₃、SnO₂、SnO、CeO₂One of or it is a variety of.

5. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, in which: BaO/RO is 0.7~1.0；And/or TiO₂/SiO₂It is 0.35~0.75；And/or B₂O₃/SiO₂It is 0.15 or less； And/or Na₂O/(Na₂O+K₂It O) is 0.3~0.85；And/or Nb₂O₅/TiO₂For 0.3 hereinafter, wherein RO be BaO, SrO, CaO, Total content of MgO.

6. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, in which: SiO₂: 43~50%；And/or TiO₂: 22~28%；And/or Na₂O:8~14%；And/or K₂O:4~10%； And/or BaO:5~11%；And/or SrO:0~3%；And/or CaO:0~3%；And/or MgO:0~3%；And/or B₂O₃: 0~ 3%；And/or Ln₂O₃: 0~1%；And/or Nb₂O₅: 0~3%；And/or ZrO₂: 0~2%；And/or Li₂O:0~2%；And/or Al₂O₃: 0~1%；And/or ZnO:0~1%；And/or Sb₂O₃: 0~0.5%, wherein the Ln₂O₃For La₂O₃、Gd₂O₃、Y₂O₃、 Yb₂O₃One of or it is a variety of.

7. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, in which: BaO/RO is 0.8~1.0；And/or TiO₂/SiO₂It is 0.4~0.7；And/or B₂O₃/SiO₂It is 0.1 or less；With/ Or Na₂O/(Na₂O+K₂It O) is 0.4~0.8；And/or Nb₂O₅/TiO₂For 0.2 hereinafter, wherein RO is BaO, SrO, CaO, MgO Total content.

8. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, in which: TiO₂/SiO₂It is 0.45~0.6；And/or B₂O₃/SiO₂It is 0.05 or less；And/or Na₂O/(Na₂O+K₂O) it is 0.5~0.75；And/or Nb₂O₅/TiO₂It is 0.1 or less.

9. the optical glass as described in claims 1 to 3 any claim, which is characterized in that do not contain Li in its component₂O； And/or ZrO is not contained₂；And/or ZnO is not contained；And/or WO is not contained₃；And/or B is not contained₂O₃。

10. the optical glass as described in claims 1 to 3 any claim, which is characterized in that its component is with weight percent It indicates, TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 95% or more, preferably TiO₂、SiO₂、Na₂O、K₂The conjunction of O and BaO Counting content is 97% or more, more preferable TiO₂、SiO₂、Na₂O、K₂Total content of O and BaO is 98% or more.

11. the optical glass as described in claims 1 to 3 any claim, which is characterized in that the refraction of the optical glass Rate nd is 1.62~1.71, preferably 1.63~1.70, more preferably 1.64~1.69；Abbe number ν_dIt is 28~36, preferably 29~35, more preferably 30~34.

12. the optical glass as described in claims 1 to 3 any claim, which is characterized in that the optical glass it is acidproof Act on stability D_AMore than 2 classes, preferably 1 class；And/or water-fast effect stability D_WMore than 2 classes, preferably 1 class；And/or Density p is 3.1g/cm³Hereinafter, preferably 3.0g/cm³Hereinafter, more preferably 2.95g/cm³Below；And/or thermal expansion coefficient α_-30/70℃It is 98 × 10^-7/ K is hereinafter, preferably 95 × 10^-7/ K is hereinafter, more preferably 90 × 10^-7/ K or less；And/or transformation temperature Spend T_gFor 610 DEG C hereinafter, preferably 600 DEG C hereinafter, more preferably 595 DEG C or less；And/or Knoop hardness H_KIt is 520 × 10⁷Pa More than, preferably 540 × 10⁷Pa or more, more preferably 550 × 10⁷Pa or more.

13. gas preform is made of optical glass described in claim 1~12 any claim.

14. optical element, using described in optical glass described in claim 1~12 any claim or claim 13 Gas preform is made.

15. optical instrument, using described in optical glass described in claim 1~12 any claim or claim 14 Optical element is made.