CN110228946B - Optical glass - Google Patents

Abstract

The invention provides an optical glass, which comprises the following components in percentage by weight: SiO 2₂：40～58％；TiO₂：18～32％；Na₂O：3～20％；K₂O: 6 to 20% of TiO₂/SiO₂0.35 to 0.8. Through reasonable component design and proportion, the optical glass has excellent chemical stability while meeting the expected refractive index and Abbe number, does not contain harmful components such as PbO and the like, and meets the requirement of environmental protection.

Description

Optical glass

Technical Field

The invention relates to optical glass, in particular to optical glass with a refractive index of 1.61-1.69 and an Abbe number of 29-36.

Background

With the continuous fusion of optics and electronic information science and new material science, the application of optical glass as a photoelectron base material in the technical fields of light transmission, light storage, photoelectric display and the like is rapidly advanced. In recent years, optical elements and optical instruments have been rapidly developed in terms of digitization, integration, and high definition, which has made higher demands on the performance of optical glasses used in optical elements of optical instruments and devices.

With the increasing call for environmental protection in the world, research and development work for lead-free and arsenic-free optical glass is continuously ongoing, for example, CN102442775A discloses an optical glass with a refractive index of 1.63-1.72 and an abbe number of 29-40, which contains 30-60% of lead oxide, and obviously meets the requirement of environmental protection.

The optical glass can be corroded by various liquids (such as acid, alkali, water and the like) in the environment during processing or using, so the resistance of the optical glass to the corrosion, namely the chemical stability of the optical glass is important for the use precision and the service life of instruments. CN101215086A discloses an optical glass having a refractive index of 1.65 to 1.85 and an Abbe number of 20 to 35, which contains a large amount of P₂O₅And Nb₂O₅The chemical stability is difficult to meet the requirements of modern optics on optical materials.

Disclosure of Invention

The invention aims to provide the environment-friendly optical glass with excellent chemical stability.

The technical scheme adopted by the invention for solving the technical problem is as follows: the optical glass comprises the following components in percentage by weight: SiO 2₂：40～58％；TiO₂：18～32％；Na₂O：3～20％；K₂O: 6 to 20% of TiO₂/SiO₂0.35 to 0.8.

Further, the optical glass comprises the following components in percentage by weight: b is₂O₃：0～10％；Ln₂O₃：0～5％；Nb₂O₅：0～8％；ZrO₂：0～5％；RO：0～8％；Li₂O：0～5％；Al₂O₃: 0 to 5 percent; ZnO: 0 to 5 percent; a clarifying agent: 0-1%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

The optical glass comprises the following components in percentage by weight: SiO 2₂：40～58％；TiO₂：18～32％；Na₂O：3～20％；K₂O：6～20％；B₂O₃：0～10％；Ln₂O₃：0～5％；Nb₂O₅：0～8％；ZrO₂：0～5％；RO：0～8％；Li₂O：0～5％；Al₂O₃: 0 to 5 percent; ZnO: 0 to 5 percent; a clarifying agent: 0 to 1% of TiO₂/SiO₂0.35-0.8, the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

Further, the optical glass comprises the following components in percentage by weight: SiO 2₂: 43-53%; and/or TiO₂: 20-30%; and/or Na₂O: 5-18%; and/or K₂O: 8-18%; and/or B₂O₃: 0 to 5 percent; and/or Ln₂O₃：0-3%; and/or Nb₂O₅: 0-6%; and/or ZrO₂: 0 to 3 percent; and/or RO: 0 to 5 percent; and/or Li₂O: 0 to 3 percent; and/or Al₂O₃: 0 to 3 percent; and/or ZnO: 0 to 3 percent; and/or a clarifying agent: 0-0.5%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

Further, the optical glass comprises the components of, by weight percent, TiO₂/SiO₂0.4 to 0.7, preferably TiO₂/SiO₂0.45 to 0.6.

Further, the optical glass comprises the components in percentage by weight, B₂O₃/SiO₂Is 0.15 or less, preferably B₂O₃/SiO₂Is 0.1 or less, more preferably B₂O₃/SiO₂Is 0.05 or less.

Further, the optical glass has a composition, expressed in weight percent, of Na₂O/K₂O is 0.2 to 3.0, preferably Na₂O/K₂O is 0.3 to 2.0, more preferably Na₂O/K₂O is 0.4 to 1.0.

Further, the optical glass has a composition expressed in weight percentage of RO/Rn₂O is 0.3 or less, preferably RO/Rn₂O is 0.2 or less, and RO/Rn is more preferable₂O is less than 0.1, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Rn₂O is Na₂O、K₂O、Li₂One or more of O.

Further, the optical glass comprises the following components in percentage by weight, Nb₂O₅/TiO₂Is 0.3 or less, preferably Nb₂O₅/TiO₂Is 0.2 or less, and Nb is more preferable₂O₅/TiO₂Is 0.1 or less.

Further, the optical glass comprises the following components in percentage by weight: wherein: SiO 2₂: 46-52%; and/or TiO₂: 22-28%; and/or Na₂O: 7-15%; and/or K₂O: 11-16%; and/or B₂O₃: 0 to 3 percent; and/or Ln₂O₃: 0 to 1 percent; and/or Nb₂O₅: 0 to 3 percent; and/or ZrO₂: 0-2%; and/or RO: 0-2%; and/or Li₂O: 0-2%; and/or Al₂O₃: 0 to 1 percent; and/or ZnO: 0 to 1 percent; and/or Sb₂O₃: 0-0.5%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of (a).

Further, the optical glass does not contain Li in the components₂O; and/or does not contain ZrO₂(ii) a And/or no ZnO; and/or does not contain WO₃(ii) a And/or do not contain B₂O₃。

Further, the optical glass comprises the components of, by weight percent, TiO₂、SiO₂、Na₂O、K₂The total content of O is 95% or more, preferably TiO₂、SiO₂、Na₂O、K₂The total content of O is 97% or more, and TiO is more preferable₂、SiO₂、Na₂O、K₂The total content of O is 98% or more.

Furthermore, the refractive index nd of the optical glass is 1.61-1.69, preferably 1.62-1.68, and more preferably 1.63-1.66; abbe number v_dIs 29 to 36, preferably 30 to 35, and more preferably 31 to 35.

Further, stability of the acid-resistant action of the optical glass D_AIs 2 or more, preferably 1; and/or a density rho of 3.0g/cm³Hereinafter, it is preferably 2.9g/cm³Hereinafter, more preferably 2.8g/cm³The following; and/or coefficient of thermal expansion alpha_-30/70℃Is 100 x 10^-7Preferably 98X 10 or less,/K^-7A value of less than or equal to K, more preferably 95X 10^-7below/K; and/or transition temperature T_g560 ℃ or lower, preferably 555 ℃ or lower, more preferably 550 ℃ or lower; and/or lambda₈₀Less than or equal to 400nm, preferably lambda₈₀Is less than or equal to 395 nm; and/or lambda₅Less than or equal to 370nm, preferably lambda₅Less than or equal to 365 nm.

The glass preform is made of the optical glass.

The optical element is made of the optical glass or the glass prefabricated member.

The optical instrument is made of the optical glass or the optical element.

The invention has the beneficial effects that: through reasonable component design and proportion, the optical glass has excellent chemical stability while meeting the expected refractive index and Abbe number, does not contain harmful components such as PbO and the like, and meets the requirement of environmental protection.

Detailed Description

The optical glass of the present invention is obtained by the following steps, which are not limited to the above-described embodiments, and can be appropriately modified within the scope of the object of the present invention. Note that, although the description of the duplicate description may be appropriately omitted, the gist of the invention is not limited to this. The optical glass of the present invention may be simply referred to as glass in the following.

[ optical glass ]

The ranges of the respective components of the optical glass of the present invention are explained below. In the present specification, the contents of the respective components are all expressed in terms of weight percentage with respect to the total amount of glass matter converted into the composition of oxides, if not specifically stated. Here, the "composition converted to oxides" means that when oxides, complex salts, hydroxides, and the like used as raw materials of the optical glass composition component of the present invention are decomposed in the melt and converted to oxides, the total amount of the oxides is 100%.

Unless otherwise indicated herein, the numerical ranges set forth herein include upper and lower values, and the terms "above" and "below" include the endpoints, and all integers and fractions within the range, and are not limited to the specific values listed in the defined range. As used herein, "and/or" is inclusive, e.g., "A and/or B," and means A alone, B alone, or both A and B.

< essential Components and optional Components >

SiO₂Is a skeleton of an optical glass, and has the functions of maintaining the chemical stability of the glass and improving the devitrification resistance of the glass as a glass network forming body. When SiO is present₂When the content is less than 40%, the above-mentioned effects are hardly obtained, and therefore SiO₂The lower limit of the content of (b) is 40%, preferably 43%, more preferably 46%; when SiO is present₂When the content of (3) is more than 58%, the glass-melting property is lowered and the transition temperature is raised, so that SiO₂The upper limit of the content of (B) is 58%, preferably 53%, more preferably 52%.

TiO₂Has the functions of improving the refractive index and dispersion of the glass, can participate in the formation of glass network, can lead the glass to be more stable and reduce the viscosity of the glass by introducing proper amount of TiO more than 18 percent₂To obtain the above effects, TiO is preferable₂The lower limit of the content of (b) is 20%, more preferably the lower limit is 22%; but with a large introduction of TiO₂Since the transmittance of the glass in the short wavelength region in the visible light region is lowered and the tendency of the glass to devitrify increases, TiO in the present invention₂The upper limit of the content of (B) is 32%, preferably 30%, more preferably 28%.

In the present invention, if TiO₂/SiO₂When the amount is less than 0.35, the glass tends to have a low melting property and a poor striae, and when TiO is used, the glass tends to have a poor striae₂/SiO₂When the amount exceeds 0.8, the chemical stability and optical transmittance of the glass decrease and the density increases, so that TiO in the present invention₂/SiO₂0.35 to 0.8, preferably TiO₂/SiO₂0.4 to 0.7, more preferably TiO₂/SiO₂0.45 to 0.6.

Na₂O hasThe effect of improving the meltability of the glass has obvious effect on improving the melting effect and reducing the transformation temperature of the glass, and more than 3 percent of Na is introduced into the invention₂O to obtain the above effect, preferably Na₂The lower limit of the content of O is 5%, and the more preferable lower limit is 7%; when Na is present₂The content of O exceeds 20%, the chemical stability and weather resistance of the glass are lowered, and therefore Na₂The upper limit of the content of O is 20%, preferably 18%, more preferably 15%.

K₂O has the function of improving the thermal stability and the melting property of the glass, and more than 6 percent of K is introduced into the glass₂O to obtain the above effect, preferably K₂The lower limit of the content of O is 8%. In some embodiments, especially by introducing 11% or more of K₂O, and also the striae of the glass can be further improved, so K is more preferable₂The lower limit of the content of O is 11%; but when K₂When the content of O exceeds 20%, the glass has a reduced devitrification resistance, so that K is contained₂The upper limit of the content of O is 20%, preferably 18%, more preferably 16%.

In some embodiments of the invention, if Na₂O/K₂When O is less than 0.2, the glass tends to have poor resistance to devitrification, and when Na is used, it tends to have poor resistance to devitrification₂O/K₂When O exceeds 3.0, the thermal stability and striae of the glass are reduced, so Na is preferable₂O/K₂O is 0.2 to 3.0, more preferably Na₂O/K₂O is 0.3 to 2.0. In some embodiments, by controlling Na₂O/K₂O is in the range of 0.4 to 1.0, and the thermal expansion coefficient of the glass can be improved, so Na is more preferable₂O/K₂O is 0.4 to 1.0.

Li₂O can lower the glass transition temperature, but its content is high, which is disadvantageous in acid resistance stability and thermal expansion coefficient of the glass, and in corrosion of a melting vessel (e.g., platinum crucible), therefore, Li₂The content of O is preferably 5% or less, more preferably 3% or less, and further preferably 2% or less. In some embodiments, even small amounts of Li are present₂O, which also causes the thermal expansion coefficient of the glass to exceed the design requirements and the devitrification resistance to deteriorate, and furtherPreferably do not contain Li₂O。

RO (RO is one or more of BaO, SrO, CaO, and MgO) improves the meltability and strength of the glass, and adjusts the optical constants of the glass, but when the content thereof exceeds 8%, the devitrification resistance of the glass is lowered, and the chemical stability is lowered. Therefore, the RO content of the present invention is 0 to 8%, preferably 0 to 5%, and more preferably 0 to 2%.

In some embodiments of the invention, the RO/Rn is controlled by₂O is less than 0.3 (wherein Rn₂O is Na₂O、K₂O、Li₂One or more kinds of O), which makes it easier to remove bubbles from the glass, gives an excellent bubble degree, lowers the transition temperature and density of the glass, and prevents the glass from suffering a decrease in devitrification resistance, preferably RO/Rn₂O is 0.2 or less, and RO/Rn is more preferable₂O is 0.1 or less.

Nb₂O₅Is a high-refraction high-dispersion component, is an optional component in the invention, and controls Nb₂O₅When the content of (2) is 8% or less, the deterioration of devitrification resistance of the glass can be suppressed. Therefore, Nb in the optical glass of the present invention₂O₅The content of (b) is 8% or less, preferably 6% or less, more preferably 3% or less. In some embodiments, by not containing Nb₂O₅The transmittance and anti-devitrification performance of the glass can be improved.

In some embodiments of the invention, the Nb is modified by₂O₅/TiO₂The optical transmittance and glass forming stability of the glass can be improved and the chemical stability of the glass can be optimized by controlling the content of Nb below 0.3, preferably Nb₂O₅/TiO₂Is 0.2 or less, and Nb is more preferable₂O₅/TiO₂Is 0.1 or less.

Al₂O₃The chemical stability of the glass can be improved to some extent, but the content thereof is too large, and the resistance to devitrification and melting of the glass are lowered, so that the content thereof is 5% or less, preferably 3% or less, and more preferably 1% or less.

B₂O₃Has the effect of improving the meltability of glass, but when the content is more than 10%,the chemical stability and devitrification resistance of the glass are reduced. Thus, in the present invention B₂O₃The upper limit of the content of (B) is 10%, preferably 5%, more preferably 3%. In some embodiments, by not introducing B₂O₃The desired chemical stability can be obtained.

In some embodiments of the invention, if B₂O₃/SiO₂If it exceeds 0.15, the chemical stability and devitrification resistance of the glass are lowered and the optical transmittance is deteriorated, so that B₂O₃/SiO₂Is 0.15 or less, preferably 0.1 or less, and more preferably 0.05 or less.

Ln₂O₃Is a component for improving the refractive index and chemical stability of the glass, is an optional component in the optical glass of the present invention, wherein Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃And Yb₂O₃One or more of (a). By mixing Ln₂O₃The content of (b) is controlled to 5% or less, whereby the devitrification resistance of the glass can be improved and a desired refractive index and Abbe number can be obtained. Thus, in the optical glass of the present invention, Ln₂O₃The upper limit of the content range is 5%, preferably 3%, more preferably 1%.

ZnO is added into the glass of the system of the invention, the refractive index and dispersion of the glass can be adjusted, the transition temperature of the glass is reduced, but when the content of ZnO exceeds 5 percent, the devitrification resistance of the glass is reduced, meanwhile, the high-temperature viscosity is smaller, the forming is difficult, and the thermal expansion coefficient and the refractive index temperature coefficient of the glass are increased. Therefore, in the present invention, the ZnO content is 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%, and further preferably not contained.

ZrO₂Is a component having an increased refractive index, and when the content thereof is large, the devitrification resistance of the glass is lowered, and ZrO in the present invention₂The content of (b) is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably not incorporated.

By adding 0-1% of Sb₂O₃、SnO₂SnO and CeO₂One or more components in the glass can be used as a clarifying agent to improve the clarifying effect of the glass, and 0-0.5% of the clarifying agent is preferably added. But when Sb is₂O₃When the content exceeds 1%, the glass tends to have a reduced fining property and the deterioration of the forming mold is promoted by the strong oxidation thereof, so that Sb in the present invention is₂O₃The amount of (B) is 1% or less, preferably 0.5% or less. SnO₂SnO may be added as a fining agent, but when the content exceeds 1%, the glass is colored, or when the glass is heated, softened and press-molded again, Sn tends to become a starting point of nucleation and devitrification occurs, so that the SnO of the present invention₂And SnO are contained in an amount of 1% or less, preferably 0.5% or less, and more preferably not contained. CeO (CeO)₂Action and addition amount ratio of (B) and SnO₂The content is 1% or less, preferably 0.5% or less, and more preferably not contained.

In order to obtain the desired refractive index and Abbe number of the glass of the present invention, and to make the glass excellent in chemical stability and optical transmittance and low in transition temperature and thermal expansion coefficient, TiO is preferable₂、SiO₂、Na₂O、K₂The total content of O is 95% or more, and TiO is more preferable₂、SiO₂、Na₂O、K₂The total content of O is 97% or more, and TiO is more preferable₂、SiO₂、Na₂O、K₂The total content of O is 98% or more.

Other components not mentioned above, such as P, can be added as necessary within the range not impairing the characteristics of the glass of the present invention₂O₅、GeO₂、TeO₂、Bi₂O₃、Ta₂O₅And Ga₂O₃The upper limit of the content of the above components, which are contained singly or in combination, is preferably 5%, more preferably 3%, still more preferably 1%, and yet still more preferably not contained. WO₃May lead to deterioration of devitrification resistance and coloring degree of the glass, and thus it is preferable in some embodiments that WO is not contained₃。

< component which should not be contained >

In the glass of the present invention, even when a small amount of oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo is contained singly or in combination, the glass is colored and absorbs at a specific wavelength in the visible light region, thereby impairing the property of the present invention to improve the effect of visible light transmittance.

In recent years, oxides of Th, Cd, Tl, Os, Be, and Se tend to Be used as harmful chemical substances in a controlled manner, and measures for protecting the environment are required not only in the glass production process but also in the processing process and disposal after commercialization. Therefore, when importance is attached to the influence on the environment, it is preferable that these components are not substantially contained except for inevitable mixing. Thereby, the optical glass becomes practically free from substances contaminating the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental countermeasures.

In order to achieve environmental friendliness, the optical glass of the present invention does not contain As₂O₃And PbO. Although As₂O₃Has the effects of eliminating bubbles and better preventing the glass from coloring, but As₂O₃The addition of (b) increases the platinum attack of the glass on the furnace, particularly on the platinum furnace, resulting in more platinum ions entering the glass, which adversely affects the service life of the platinum furnace.

The term "not introduced", "not containing" or "0%" as used herein means that the compound, molecule or element is not intentionally added as a raw material to the optical glass of the present invention; however, it is within the scope of the present invention that certain impurities or components which are not intentionally added may be present as raw materials and/or equipment for producing the optical glass and may be contained in the final optical glass in small or trace amounts.

The performance of the optical glass of the present invention will be described below.

< refractive index and Abbe number >

Refractive index (nd) and Abbe number (. nu.) of optical glass_d) The test was carried out according to the method specified in GB/T7962.1-2010.

The refractive index (nd) of the optical glass is 1.61-1.69, preferably 1.62-1.68, more preferably 1.63-1.66; abbe number (v)_d) Is 29 to 36, preferably 30 to 35, and more preferably 31 to 35.

< stability against acid Effect >

Stability of acid resistance of optical glasses (D)_A) (powder method) the test was carried out according to the method prescribed in GB/T17129.

Stability of acid resistance of the optical glass of the present invention (D)_A) Is 2 or more, preferably 1.

< Density >

The density (. rho.) of the optical glass was measured according to the method specified in GB/T7962.20-2010.

The optical glass of the present invention has a density (. rho.) of 3.0g/cm³Hereinafter, it is preferably 2.9g/cm³Hereinafter, more preferably 2.8g/cm³The following.

< coefficient of thermal expansion >

Coefficient of thermal expansion (alpha) of optical glass_-30/70℃) And testing data at-30-70 ℃ according to a method specified in GB/T7962.16-2010.

The coefficient of thermal expansion (. alpha.) of the optical glass of the present invention_-30/70℃) Is 100 x 10^-7Preferably 98X 10 or less,/K^-7A value of less than or equal to K, more preferably 95X 10^-7and/K is less than or equal to.

< transition temperature >

Transition temperature (T) of optical glass_g) The test was carried out according to the method specified in GB/T7962.16-2010.

Transition temperature (T) of the optical glass of the present invention_g) 560 ℃ or lower, preferably 555 ℃ or lower, and more preferably 550 ℃ or lower.

< degree of coloration >

Coloring degree (. lamda.) for short-wave transmission spectral characteristics of the glass of the present invention₈₀And λ₅) And (4) showing. Lambda [ alpha ]₈₀Refers to the corresponding wavelength when the transmittance of the glass reaches 80 percent。λ₈₀Was measured using a glass having a thickness of 10. + -. 0.1mm with two opposing planes parallel to each other and optically polished, measuring the spectral transmittance in the wavelength region from 280nm to 700nm and showing a wavelength of transmittance of 80%. The spectral transmittance or transmittance is the intensity I of light incident perpendicularly to the surface of the glass_inLight transmitted through the glass and having an intensity I emitted from a plane_outIn the case of light of (1) through (I)_out/I_inThe quantity expressed and also the transmission of the surface reflection losses on the above-mentioned surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Thus, in high refractive index glasses, λ₈₀A small value of (a) means that the glass itself is colored very little.

Optical glass lambda of the present invention₈₀Less than or equal to 400nm, preferably lambda₈₀Is less than or equal to 395 nm; lambda [ alpha ]₅Less than or equal to 370nm, preferably lambda₅Less than or equal to 365 nm.

< degree of bubbling >

The bubble degree of the optical glass is tested according to the method specified in GB/T7962.8-2010.

The optical glass of the present invention has a bubble degree of B class or more, preferably A class or more, more preferably A class₀More than grade.

[ production method ]

The method for manufacturing the optical glass comprises the following steps: the glass is produced by adopting conventional raw materials and conventional processes, carbonate, nitrate, sulfate, hydroxide, oxide and the like are used as raw materials, the materials are mixed according to a conventional method, the mixed furnace burden is put into a smelting furnace at 1150-1350 ℃ for smelting, and after clarification, stirring and homogenization, homogeneous molten glass without bubbles and undissolved substances is obtained, and the molten glass is cast in a mold and annealed. Those skilled in the art can appropriately select the raw materials, the process method and the process parameters according to the actual needs.

Glass preform and optical element

The glass preform can be produced from the optical glass produced by, for example, grinding or press molding such as reheat press molding or precision press molding. That is, the glass preform may be produced by machining the optical glass by grinding, polishing, or the like, or by producing a preform for press molding from the optical glass, subjecting the preform to reheat press molding, and then polishing, or by precision press molding the preform obtained by polishing.

It should be noted that the means for producing the glass preform is not limited to the above means. As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform from the optical glass of the present invention, and use the preform for reheat press forming, precision press forming, or the like to produce optical elements such as lenses, prisms, or the like.

The glass preform of the present invention and the optical element are each formed of the above-described optical glass of the present invention. The glass preform of the present invention has excellent characteristics possessed by optical glass; the optical element of the present invention has excellent characteristics of optical glass, and can provide optical elements such as various lenses and prisms having high optical values.

Examples of the lens include various lenses such as a concave meniscus lens, a convex meniscus lens, a double convex lens, a double concave lens, a plano-convex lens, and a plano-concave lens, each of which has a spherical or aspherical lens surface.

[ optical instruments ]

The optical element formed by the optical glass can be used for manufacturing optical instruments such as photographic equipment, camera equipment, display equipment, monitoring equipment and the like.

Examples

< example of optical glass >

In order to further clarify the explanation and explanation of the technical solution of the present invention, the following non-limiting examples are provided.

In this example, optical glasses having compositions shown in tables 1 to 2 were obtained by the above-mentioned method for producing optical glasses. The characteristics of each glass were measured by the test method described in the present invention, and the measurement results are shown in tables 1 to 2.

TABLE 1

TABLE 2

< glass preform example >

Various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens and a plano-concave lens, and preforms such as prisms were produced from the glasses obtained in examples 1 to 20 of optical glass by means of polishing or press molding such as reheat press molding and precision press molding.

< optical element example >

The preforms obtained in the above examples of glass preforms were annealed to reduce the deformation in the glass and to fine-tune the optical properties such as refractive index to desired values.

Next, each preform is ground and polished to produce various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens, and a plano-concave lens, and prisms. The surface of the resulting optical element may be coated with an antireflection film.

< optical Instrument example >

The optical element obtained by the above-described optical element embodiment is used for, for example, imaging devices, sensors, microscopes, medical technologies, digital projection, communications, optical communication technologies/information transmission, optics/lighting in the automobile field, photolithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or for image pickup devices and apparatuses in the vehicle-mounted field, by forming an optical component or an optical assembly by using one or more optical elements through optical design.

Claims (32)

1. Optical glass, characterized in that its components, expressed in weight percent, contain: SiO 2₂：40～51.42％；TiO₂：18～32％；Na₂O：3～20％；K₂O: 6 to 20% of TiO₂/SiO₂0.35 to 0.8.

2. The optical glass according to claim 1, wherein the composition, expressed in weight percent, further comprises: b is₂O₃：0～10％；Ln₂O₃：0～5％；Nb₂O₅：0～8％；ZrO₂：0～5％；RO：0～8％；Li₂O：0～5％；Al₂O₃: 0 to 5 percent; ZnO: 0 to 5 percent; a clarifying agent: 0-1%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

3. Optical glass, characterized in that its components are expressed in weight percent: SiO 2₂：40～51.42％；TiO₂：18～32％；Na₂O：3～20％；K₂O：6～20％；B₂O₃：0～10％；Ln₂O₃：0～5％；Nb₂O₅：0～8％；ZrO₂：0～5％；RO：0～8％；Li₂O：0～5％；Al₂O₃：0～5％；ZnO：0～5％；A clarifying agent: 0 to 1% of TiO₂/SiO₂0.35-0.8, the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

4. An optical glass according to any one of claims 1 to 3, wherein the composition is expressed in weight percent, wherein: SiO 2₂: 43-51.42%; and/or TiO₂: 20-30%; and/or Na₂O: 5-18%; and/or K₂O: 8-18%; and/or B₂O₃: 0 to 5 percent; and/or Ln₂O₃: 0 to 3 percent; and/or Nb₂O₅: 0-6%; and/or ZrO₂: 0 to 3 percent; and/or RO: 0 to 5 percent; and/or Li₂O: 0 to 3 percent; and/or Al₂O₃: 0 to 3 percent; and/or ZnO: 0 to 3 percent; and/or a clarifying agent: 0-0.5%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

5. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is TiO₂/SiO₂0.4 to 0.7.

6. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is TiO₂/SiO₂0.45 to 0.6.

7. As claimed in claimAn optical glass according to any one of claims 1 to 3, wherein the component B is represented by weight percentage₂O₃/SiO₂Is 0.15 or less.

8. An optical glass according to any one of claims 1 to 3, characterised in that it has the composition, expressed in weight percent, B₂O₃/SiO₂Is 0.1 or less.

9. An optical glass according to any one of claims 1 to 3, characterised in that it has the composition, expressed in weight percent, B₂O₃/SiO₂Is 0.05 or less.

10. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is Na₂O/K₂O is 0.2 to 3.0.

11. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is Na₂O/K₂O is 0.3 to 2.0.

12. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is Na₂O/K₂O is 0.4 to 1.0.

13. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is RO/Rn₂O is less than 0.3, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Rn₂O is Na₂O、K₂O、Li₂One or more of O.

14. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is RO/Rn₂O is0.2 or less, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Rn₂O is Na₂O、K₂O、Li₂One or more of O.

15. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is RO/Rn₂O is less than 0.1, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Rn₂O is Na₂O、K₂O、Li₂One or more of O.

16. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percent, is Nb₂O₅/TiO₂Is 0.3 or less.

17. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percent, is Nb₂O₅/TiO₂Is 0.2 or less.

18. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percent, is Nb₂O₅/TiO₂Is 0.1 or less.

19. An optical glass according to any one of claims 1 to 3, wherein the composition is expressed in weight percent, wherein: SiO 2₂: 46-51.42%; and/or TiO₂: 22-28%; and/or Na₂O: 7-15%; and/or K₂O: 11-16%; and/or B₂O₃: 0 to 3 percent; and/or Ln₂O₃: 0 to 1 percent; and/or Nb₂O₅: 0 to 3 percent; and/or ZrO₂: 0-2%; and/or RO: 0-2%; and/or Li₂O: 0-2%; and/or Al₂O₃: 0 to 1 percent; and/or ZnO: 0 to 1 percent; and/or Sb₂O₃: 0-0.5%, wherein the RO is one or more of BaO, SrO, CaO and MgO, and Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃One or more of (a).

20. An optical glass according to any of claims 1 to 3, wherein the composition does not contain Li₂O; and/or does not contain ZrO₂(ii) a And/or no ZnO; and/or does not contain WO₃(ii) a And/or do not contain B₂O₃。

21. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is TiO₂、SiO₂、Na₂O、K₂The total content of O is 95% or more.

22. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is TiO₂、SiO₂、Na₂O、K₂The total content of O is 97% or more.

23. An optical glass according to any one of claims 1 to 3, characterised in that its composition, expressed in weight percentage, is TiO₂、SiO₂、Na₂O、K₂The total content of O is 98% or more.

24. An optical glass according to any one of claims 1 to 3, wherein the optical glass has a refractive index nd of 1.61 to 1.69; abbe number v_dIs 29 to 36.

25. An optical glass according to any one of claims 1 to 3, wherein the optical glass has a refractive index nd of 1.62 to 1.68; abbe number v_dIs 30 to 35.

26. An optical glass according to any one of claims 1 to 3, wherein the optical glass has a refractive index nd of 1.63 to 1.66; abbe number v_dIs 31 to 35.

27. The optical glass according to any one of claims 1 to 3, wherein the optical glass has an acid-resistance stability D_AIs more than 2 types; and/or a density rho of 3.0g/cm³The following; and/or coefficient of thermal expansion alpha_-30/70℃Is 100 x 10^-7below/K; and/or transition temperature T_gBelow 560 ℃; and/or lambda₈₀Less than or equal to 400 nm; and/or lambda₅Less than or equal to 370 nm.

28. The optical glass according to any one of claims 1 to 3, wherein the optical glass has an acid-resistance stability D_AIs of type 1; and/or a density rho of 2.9g/cm³The following; and/or coefficient of thermal expansion alpha_-30/70℃Is 98 x 10^-7below/K; and/or transition temperature T_gBelow 555 ℃; and/or lambda₈₀Is less than or equal to 395 nm; and/or lambda₅Less than or equal to 365 nm.

29. The optical glass according to any one of claims 1 to 3, wherein the optical glass has a density p of 2.8g/cm³The following; and/or coefficient of thermal expansion alpha_-30/70℃Is 95X 10^-7below/K; and/or transition temperature T_gIs below 550 ℃.

30. A glass preform made of the optical glass as claimed in any one of claims 1 to 29.

31. An optical element produced from the optical glass according to any one of claims 1 to 29 or the glass preform according to claim 30.

32. An optical device comprising the optical glass according to any one of claims 1 to 29 or the optical element according to claim 31.