Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
  • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B19/00—Other methods of shaping glass
  • C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
  • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
  • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements

Definitions

• the invention relates to an optical glass, in particular to a high-refractive and high-dispersion optical glass with excellent anti-devitrification properties.
• the secondary spectrum is the main factor affecting the imaging quality. Correcting the secondary spectrum is a prominent problem in the design of a long focal length optical system, and it is also a difficult problem to solve.
• the correction of the secondary spectrum in the optical system depends to a large extent on the choice of glass material. Glass with high refraction, high dispersion, and low relative partial dispersion (P g,F ) is beneficial to eliminate the secondary spectrum when applied to the coupling lens. , simplify and optimize the optical system and improve the image quality.
• Secondary pressing has the advantages of low production cost, low production difficulty, and easy mass production, and is widely used in the production of glass components.
• Secondary pressing is a production method in which the glass material is placed in a mold and heated to above the softening point, and then the glass material is pressed into a predetermined shape by pressing. This production method often needs to heat the glass to 100-200°C above the transition temperature. At this time, the glass already has a certain fluidity. If the anti-devitrification performance of the glass is not good, the glass will have some problems during the secondary pressing process. Risk of crystallization scrapping.
• CN104583142A discloses an optical glass with relatively low relative partial dispersion, the composition of which contains more than 5.0% and less than 55.0% of B 2 O 3 and more than 15% and less than 60% of rare earth oxides in mass %.
• the anti-devitrification performance of optical glass is poor, and the glass has a greater risk of devitrification during secondary pressing.
• the technical problem to be solved by the present invention is to provide a high-refractive and high-dispersion optical glass with excellent anti-devitrification properties and low relative partial dispersion.
• Optical glass whose components are expressed in weight percentage, containing: SiO 2 : 25-45%; ZrO 2 : 2-15%; Nb 2 O 5 : 35-60%; Li 2 O: 1-10%; Na 2 O: 2 to 15%; K 2 O: 0 to 10%.
• the optical glass whose components are expressed in weight percentage, further contains: B 2 O 3 : 0-10%; and/or Al 2 O 3 : 0-5%; and/or La 2 O 3 : 0-10%; and/or Gd 2 O 3 : 0-10%; and/or Y 2 O 3 : 0-10%; and/or Yb 2 O 3 : 0-10%; and/or BaO: and/or SrO: 0-10%; and/or CaO: 0-10%; and/or MgO: 0-5%; and/or ZnO: 0-10%; and/or TiO 2 : 0-10%; and/or WO 3 : 0-10%; and/or Bi 2 O 3 : 0-5%; and/or Ta 2 O 5 : 0-5%; and/or Sb 2 O 3 : 0 to 1%.
• Optical glass whose components are expressed by weight percentage, including SiO 2 : 25-45%; ZrO 2 : 2-15%; Nb 2 O 5 : 35-60%; Li 2 O: 1-10%; Na 2 O : 2 to 15%; K 2 O : 0 to 10%; B 2 O 3 : 0 to 10%; Al 2 O 3 : 0 to 5%; La 2 O 3 : 0 to 10%; Gd 2 O 3 : 0-10%; Y 2 O 3 : 0-10%; Yb 2 O 3 : 0-10%; BaO: 0-10%; SrO: 0-10%; CaO: 0-10%; MgO: 0- 5%; ZnO: 0-10%; TiO 2 : 0-10%; WO 3 : 0-10%; Bi 2 O 3 : 0-5%; Ta 2 O 5 : 0-5%; Sb 2 O 3 : 0 to 1% composition.
• optical glass whose components are expressed in weight percentage, satisfies one or more of the following 9 situations:
• B 2 O 3 +Al 2 O 3 is 0 ⁇ 12%
• Re 2 O 3 is 0 ⁇ 15%
• RO is 0 ⁇ 10%
• SiO 2 +ZrO 2 is 30-55%
• Nb 2 O 5 +ZrO 2 is 40 ⁇ 70%
• TiO 2 +WO 3 +Bi 2 O 3 is 0-10%
• Rn 2 O is 6 ⁇ 20%
• ZrO 2 /Rn 2 O is 0.1 to 2.3
• the Re 2 O 3 is the total content of La 2 O 3 , Gd 2 O 3 and Y 2 O 3 , RO is the total content of BaO, SrO, CaO, and MgO, and Rn 2 O is Li 2 O, Na 2 O, Total content of K 2 O.
• the components of the optical glass are expressed in weight percentage, wherein: SiO 2 : 28-42%; and/or ZrO 2 : 3-12%; and/or Nb 2 O 5 : 38-57% and/or Li 2 O: 2-8%; and/or Na 2 O: 4-13%; and/or K 2 O: 0.5-8%; and/or B 2 O 3 : 0-5%; and/or Al 2 O 3 : 0-2%; and/or La 2 O 3 : 0-5%; and/or Gd 2 O 3 : 0-5%; and/or Y 2 O 3 : 0-5 %; and/or Yb 2 O 3 : 0-5%; and/or BaO: 0-5%; and/or SrO: 0-5%; and/or CaO: 0-8%; and/or MgO: and/or ZnO: 0-5%; and/or TiO 2 : 0-7%; and/or WO 3 : 0-5%; and/or Ta 2 O 5 : 0-2%; and/
• optical glass whose components are expressed in weight percentage, satisfies one or more of the following 9 situations:
• B 2 O 3 +Al 2 O 3 is 0 ⁇ 6%
• SiO 2 +ZrO 2 is 33-52%
• Nb 2 O 5 +ZrO 2 is 45-65%;
• TiO 2 +WO 3 +Bi 2 O 3 is 0-7%
• ZrO 2 /Rn 2 O is 0.2 to 1.8
• the Re 2 O 3 is the total content of La 2 O 3 , Gd 2 O 3 and Y 2 O 3 , RO is the total content of BaO, SrO, CaO, and MgO, and Rn 2 O is Li 2 O, Na 2 O, Total content of K 2 O.
• the components of the optical glass are expressed in weight percentage, wherein: SiO 2 : 30-40%; and/or ZrO 2 : 4-10%; and/or Nb 2 O 5 : 41-54% and/or B 2 O 3 : 0-3%; and/or Li 2 O: 3-6%; and/or Na 2 O: 5-12%; and/or K 2 O: 1-6%; and/or BaO: 0-2%; and/or CaO: 0-5%; and/or ZnO: 0-2%; and/or TiO 2 : 0-4%; and/or Sb 2 O 3 : 0 ⁇ 0.1%.
• optical glass whose components are expressed in weight percentage, satisfies one or more of the following 7 situations:
• RO is 0 ⁇ 5%
• SiO 2 +ZrO 2 is 36-49%
• Nb 2 O 5 +ZrO 2 is 50-60%
• TiO 2 +WO 3 +Bi 2 O 3 is 0-4%;
• Rn 2 O is 12 ⁇ 16%
• ZrO 2 /Rn 2 O is 0.3 to 1.3
• the RO is the total content of BaO, SrO, CaO, and MgO
• the Rn 2 O is the total content of Li 2 O, Na 2 O, and K 2 O.
• the components of the optical glass do not contain B 2 O 3 ; and/or do not contain Al 2 O 3 ; and/or do not contain La 2 O 3 ; and/or do not contain Gd 2 O 3 ; and/or no Y2O3 ; and/or no Yb2O3 ; and/or no MgO; and/or no SrO ; and/or no WO3 ; and/or no Bi2O 3 ; and/or does not contain Ta 2 O 5 ; and/or does not contain Re 2 O 3 , where Re 2 O 3 is the total content of La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 .
• the refractive index nd of the optical glass is 1.74-1.82, preferably the refractive index nd is 1.76-1.80;
• the Abbe number ⁇ d is 25-32, preferably the Abbe number ⁇ d is 27-30 .
• the relative partial dispersion of the optical glass is P g,F ⁇ 0.6497-0.001703 ⁇ d , preferably P g,F ⁇ 0.6477-0.001703 ⁇ d ; and/or the ⁇ 5 of the optical glass is below 360 nm, Preferably, ⁇ 5 is 350 nm or less.
• the glass preform is made of the above-mentioned optical glass.
• the optical element is made of the above-mentioned optical glass or the above-mentioned glass preform.
• An optical instrument containing the above-mentioned optical glass, and/or containing the above-mentioned optical element.
• the beneficial effects of the present invention are: by containing components such as SiO 2 and alkali metal oxides in an appropriate amount, the optical glass has excellent anti-devitrification properties; by containing Nb 2 O 5 , ZrO 2 and other oxides with high refractive index components, to obtain optical glass with high refractive index and high dispersion; through reasonable component design, the glass has lower relative partial dispersion.
• optical glass of this invention is not limited to the following embodiment, It can change suitably within the range of the objective of this invention, and can implement.
• description of the repeated description part may be appropriately omitted, this does not limit the gist of the invention.
• the optical glass of the present invention is sometimes simply referred to as glass.
• each component (component) of the optical glass of the present invention will be described below.
• the content of each component and the total content are all expressed in weight percent (wt%), that is, the content and total content of each component are relative to the total glass substance of the composition converted into oxides. Amounts are expressed in weight percent.
• the “composition in terms of oxides” refers to the case where the oxides, complex salts, hydroxides, etc. used as raw materials of the optical glass composition of the present invention are decomposed and converted into oxides when melted. , and the total amount of the oxide is taken as 100%.
• SiO 2 is a glass network generator, which can improve the chemical stability and weather resistance of glass and maintain the anti-devitrification performance of glass. If the content of SiO 2 is less than 25%, it is difficult to achieve the above effects. Therefore, the lower limit of the SiO 2 content is 25 %, preferably 28 %, and more preferably 30%. If the content of SiO 2 is higher than 45%, the glass becomes difficult to melt, and it becomes difficult to obtain the refractive index desired in the present invention. Therefore, the upper limit of the content of SiO 2 is 45%, preferably 42%, and more preferably 40%.
• B 2 O 3 can reduce the difficulty of glass compounding, and at the same time reduce the high temperature viscosity and transition temperature of glass.
• the relative partial dispersion of the glass is increased.
• the content of B 2 O 3 in the present invention is 10% or less, preferably 5% or less, more preferably 3% or less, and further preferably does not contain B 2 O 3 .
• Al 2 O 3 can improve the weather resistance of glass, but it will increase the melting temperature and high temperature viscosity of glass, and increase the difficulty of production.
• the content of Al 2 O 3 in the present invention is 0 to 5%, preferably 0 to 2%, and more preferably no Al 2 O 3 is contained.
• B 2 O 3 +Al 2 O 3 is less than 12%, which is beneficial to maintain the relative partial dispersion of the glass within the design range.
• B 2 O 3 +Al 2 O 3 is 0-6%.
• La 2 O 3 is a component with high refraction and low dispersion, which can greatly reduce the relative partial dispersion of glass in glass, but when its content is too high, the dispersion of glass will be reduced, and it is difficult to achieve the desired high refraction and high dispersion of the present invention.
• the content of La 2 O 3 in the present invention is 10% or less, preferably 5% or less, and more preferably no La 2 O 3 is contained.
• Gd 2 O 3 is a component with high refractive index and low dispersion, which can reduce the relative partial dispersion of glass in glass, but the expensive raw material price limits the use of Gd 2 O 3 in glass. Therefore, the content of Gd 2 O 3 is 0 to 10%, preferably 0 to 5%, and more preferably no Gd 2 O 3 is contained.
• Y 2 O 3 can improve the melting property of the glass and also improve the weather resistance of the glass, but if its content is too high, the dispersion of the glass will be reduced, and the optical properties of high refraction and high dispersion expected in the present invention cannot be achieved. Therefore, the content of Y 2 O 3 is 0 to 10%, preferably 0 to 5%, and more preferably no Y 2 O 3 is contained.
• the total content of Re 2 O 3 of La 2 O 3 , Gd 2 O 3 and Y 2 O 3 is preferably 0 to 15%, more preferably 0 to 8% of Re 2 O 3 , and still more preferably not containing Re 2 O 3 .
• Yb 2 O 3 can increase the refractive index of glass in glass, but it has an obvious absorption peak in the near-infrared region. When used as an optical element, it will change the spectral composition of the transmitted light, thereby affecting the image restoration effect. Therefore, the content range of Yb 2 O 3 is limited to 0 to 10%, preferably 0 to 5%, and more preferably no Yb 2 O 3 is contained.
• the raw material of BaO is cheap and easy to obtain, and it can well increase the refractive index of glass in glass.
• BaO is unfavorable for reducing the density of glass.
• the BaO content is limited to 0 to 10%, preferably 0 to 5%, and more preferably 0 to 2%.
• SrO is expensive and high content leads to an increase in the cost of the glass
• the content of SrO is limited to 0 to 10%, preferably 0 to 5%, and more preferably does not contain SrO.
• CaO can improve the hardness, mechanical strength and weather resistance of glass. More importantly, compared with BaO and SrO, CaO is more favorable for reducing the density of glass. In addition, CaO is also conducive to the control and adjustment of optical constants in the production process. However, when the CaO content is too high, it is difficult to melt the glass, and a calcium-rich hard shell is easily formed in the melting pool during the production process. Therefore, the content of CaO is limited to 0 to 10%, preferably 0 to 8%, and more preferably 0 to 5%.
• MgO helps to improve the weather resistance of glass, but when the content is high, the refractive index of the glass is difficult to meet the design requirements, the anti-devitrification performance and stability of the glass decrease, and the cost of the glass rises rapidly. Therefore, the MgO content is limited to 0 to 5%, preferably 0 to 3%, and more preferably does not contain MgO.
• the total content RO of alkaline earth metal oxides is preferably controlled within the range of 0-10%, and more It is preferably 0 to 8%, more preferably 0 to 5%.
• the content of ZnO in the glass of the present invention is 0 to 10%, preferably 0 to 5%, and more preferably 0 to 2%.
• ZrO 2 has the effect of improving the weather resistance of glass and improving the devitrification resistance of glass.
• ZrO 2 in glass can greatly reduce the relative partial dispersion of glass.
• the solubility of ZrO 2 in the glass of this system is not high, and when the content is too large, it is easy to dissociate from the glass system to form crystallization nuclei, which in turn leads to the deterioration of the anti-devitrification performance of the glass. Therefore, the content of ZrO 2 in the present invention is 2 to 15%, preferably 3 to 12%, and more preferably 4 to 10%.
• SiO 2 and ZrO 2 can improve the weather resistance of the glass, and at the same time, SiO 2 and ZrO 2 are also the two components which are relatively difficult to melt in the present invention.
• the glass can not only obtain excellent weather resistance, but also can obtain better production performance. Therefore, 30 to 55% of SiO 2 +ZrO 2 is preferable, 33 to 52% of SiO 2 +ZrO 2 is more preferable, and 36 to 49% of SiO 2 +ZrO 2 is more preferable.
• Nb 2 O 5 is an essential component of the glass of the present invention, and is a key component to ensure that the glass has the characteristics of high refraction, high dispersion and low relative partial dispersion.
• the inventors have found that the relative partial dispersion of Nb 2 O 5 to the glass is roughly consistent with the contribution to the Abbe number when the Abbe number is in the range of 25 to 32, that is, with the increase of Nb 2 O 5 in the glass. , the relative partial dispersion deviation ( ⁇ P g,F ) of the glass does not change substantially. Therefore, the content of Nb 2 O 5 in the present invention is 35 to 60%, preferably 38 to 57%, and more preferably 41 to 54%.
• Nb 2 O 5 and ZrO 2 are the key components to maintain the low relative partial dispersion performance of the present invention.
• Nb 2 O 5 +ZrO 2 is preferably 40 to 70%, more preferably 45 to 65%, and even more preferably 50 to 60%.
• TiO 2 can increase the refractive index and dispersion of glass, and improve the anti-devitrification properties of glass.
• the presence of TiO 2 in the glass will lead to a sharp increase in P g,F .
• the content of TiO 2 in the glass is higher than 10%, the P g,F characteristics of the glass are difficult to meet the design requirements. Therefore, the content of TiO 2 is 0 to 10%, preferably 0 to 7%, and more preferably 0 to 4%.
• WO 3 can improve the refractive index and dispersion of the glass, but it will lead to a sharp increase in the P g, F of the glass, and also lead to a decrease in the light transmittance of the glass.
• the content of WO 3 is 0 to 10%, preferably 0 to 5%, and more preferably no WO 3 is contained.
• Bi 2 O 3 can improve the refractive index and dispersion of glass, but it will lead to a sharp increase in P g,F of glass.
• Bi 2 O 3 corrodes the platinum utensils seriously during the smelting process, so its content is limited to within 5%, and it is preferable not to contain Bi 2 O 3 .
• TiO 2 , WO 3 and Bi 2 O 3 all have the effect of increasing the refractive index and dispersion of the glass, but all of them make the P g,F of the glass increase sharply. Therefore, in the present invention, the total content of TiO 2 , WO 3 and Bi 2 O 3 is preferably 0 to 10 %, and more preferably 0 to 0 to TiO 2 + WO 3 +Bi 2 O 3 7%, more preferably TiO 2 +WO 3 +Bi 2 O 3 is 0 to 4%.
• Ta 2 O 5 is a high-refractive and high-dispersion component, which can reduce the P g, F value of the glass. At the same time, Ta 2 O 5 can improve the anti-devitrification properties of the glass and enhance the stability of the glass. But the expensive raw material cost greatly limits the use of Ta 2 O 5 .
• the content of Ta 2 O 5 in the present invention is 0 to 5%, preferably 0 to 2%, and more preferably no Ta 2 O 5 is contained.
• Li 2 O is an alkali metal oxide, and is a key component for reducing the difficulty of glass production in the present invention.
• Li 2 O can be used as a flux to reduce the difficulty of glass compounding.
• Li 2 O can reduce the high temperature viscosity and transition temperature of glass, making glass production and processing easier.
• the inventor found that by including Li 2 O in the glass, the weather resistance of the glass can be improved by utilizing the accumulation effect of Li 2 O.
• the content of Li 2 O is 1 to 10%, preferably 2 to 8%, and more preferably 3 to 6%.
• Na 2 O and K 2 O can also reduce the melting temperature and high temperature viscosity of glass, and reduce the difficulty of glass production, but compared with the accumulation effect of Li 2 O, Na 2 O and K 2 O will cause the fracture of the silicon network structure of the glass , and cause the glass P g,F to increase. Therefore, the content of Na 2 O in the glass of the present invention is 2-15%, preferably 4-13%, more preferably 5-12%; the content of K 2 O is 0-10%, preferably 0.5-8%, More preferably, it is 1 to 6%.
• Li 2 O, Na 2 O and K 2 O are all alkali metal oxides, which can reduce the difficulty of glass production, but too much content will reduce the chemical stability of the glass. Therefore, in the present invention, the total content Rn 2 O of Li 2 O, Na 2 O and K 2 O is preferably controlled within the range of 6 to 20%, more preferably 10 to 18%, and still more preferably 12 to 16%.
• the alkali metal oxide Rn 2 O can promote the melting of SiO 2 and ZrO 2 and reduce the difficulty of smelting glass. Further, when the ratio between the total content of SiO 2 and ZrO 2 SiO 2 +ZrO 2 and the content of Rn 2 O (SiO 2 +ZrO 2 )/Rn 2 O is between 1.5 and 8.0, the glass can obtain excellent
• the melting performance and anti-devitrification performance are preferably (SiO 2 +ZrO 2 )/Rn 2 O of 1.8-6.5, more preferably (SiO 2 +ZrO 2 )/Rn 2 O of 2.0-5.0.
• the silicate glass network structure does not have strong bearing capacity for ZrO 2 , and when the ZrO 2 content is too high, it is easy to precipitate and form stones during the melting process.
• the alkali metal oxide Rn 2 O can improve the carrying capacity of the silicate glass for ZrO 2 , when the ratio between the content of ZrO 2 and the content of Rn 2 O is ZrO
• 2 /Rn 2 O is in the range of 0.1-2.3
• the bearing capacity of the glass system of the present invention for ZrO 2 can be improved, and the chemical stability of the glass can be improved.
• ZrO 2 /Rn 2 O is preferably 0.2 to 1.8, and more preferably ZrO 2 /Rn 2 O is 0.3 to 1.3.
• Sb 2 O 3 can be used as a clarifying agent in the present invention to improve the clarifying effect of the glass, and its content ranges from 0 to 1%, preferably from 0 to 0.5%, and more preferably from 0 to 0.1%.
• the glass of the present invention even if the oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained in small amounts alone or in combination, the glass will be colored, and in the visible light region Specified wavelengths are absorbed, thereby weakening the property of the present invention to improve the visible light transmittance effect. Therefore, it is preferable not to actually contain the optical glass, which requires transmittance at wavelengths in the visible light region.
• Oxides of Th, Cd, Tl, Os, Be, and Se tend to be used in a controlled manner as harmful chemical substances in recent years, not only in the glass manufacturing process, but also in the processing process and disposal after productization. Action is required. Therefore, when considering the influence on the environment, it is preferable not to actually contain them except for unavoidable mixing. Thereby, the optical glass becomes practically free of substances that pollute the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental measures.
• the optical glass of the present invention does not contain As 2 O 3 and PbO.
• As 2 O 3 has the effect of eliminating bubbles and preventing glass coloration, the addition of As 2 O 3 will increase the platinum erosion of the glass to the furnace, especially the platinum furnace, resulting in more platinum ions entering the glass. The service life of the platinum furnace is adversely affected.
• PbO can significantly improve the high refractive index and high dispersion properties of glass, but both PbO and As 2 O 3 are substances that cause environmental pollution.
• Does not contain and "0%” as described herein means that the compound, molecule or element is not intentionally added to the optical glass of the present invention as a raw material; however, as a raw material and/or equipment for producing optical glass, there may be some Impurities or components that are not intentionally added will be contained in a small or trace amount in the final optical glass, and this situation is also within the protection scope of the patent of the present invention.
• the refractive index (n d ) and Abbe number ( ⁇ d ) of optical glass are tested according to the methods specified in "GB/T 7962.1-2010".
• the refractive index (n d ) of the optical glass of the present invention is 1.74-1.82, preferably 1.76-1.80.
• the Abbe number ( ⁇ d ) of the optical glass of the present invention is 25-32, preferably 27-30.
• n g , n F and n C are tested according to the method specified in "GB/T 7962.1-2010".
• the relative partial dispersion (P g,F ) of the optical glass of the present invention is ⁇ 0.6497-0.001703 ⁇ d , preferably P g,F ⁇ 0.6477-0.001703 ⁇ d .
• the transmittance of glass ( ⁇ 5 ) is used to measure the short-wave transmittance of glass.
• the specific test method is: place a 10mm thick double-sided polished sample on a spectrophotometer to test the transmittance of glass.
• ⁇ 5 refers to the transmittance of glass. The corresponding wavelength when reaching 5%.
• the ⁇ 5 of the optical glass of the present invention is 360 nm or less, preferably 350 nm or less.
• test method for the anti-devitrification performance of optical glass is as follows: put the sample in a muffle furnace at T g +230 °C for 15 minutes, take it out, cool it at room temperature, and then observe each cubic meter in the sample after double-sided polishing. Number of crystallized particles in centimeters (A).
• the number of crystallites (A) of the optical glass of the present invention is 5 or less, preferably 2 or less, and more preferably 0.
• the manufacturing method of the optical glass of the present invention is as follows: the glass of the present invention is produced by using conventional raw materials and conventional processes, using compound salts (such as carbonates, nitrates, sulfates), hydroxides, oxides, etc. as raw materials, according to conventional methods. After batching, put the prepared charge into a smelting furnace at 1250-1450°C for melting, and after clarification, stirring and homogenization, a homogeneous molten glass without bubbles and no undissolved substances is obtained. Cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods and process parameters according to actual needs.
• a glass preform can be produced from the optical glass produced by means of grinding, or by means of press forming such as reheat press forming and precision press forming. That is, a glass preform can be produced by subjecting optical glass to mechanical processing such as grinding and grinding, or by producing a preform for press-molding from optical glass, reheating the preform and then grinding the preform. Glass preforms are produced by machining, or by precision stamping of preforms produced by grinding. It should be noted that the means for preparing the glass preform is not limited to the above-mentioned means.
• the optical glass of the present invention is useful for various optical elements and optical designs, and it is particularly preferable to form a preform from the optical glass of the present invention, and to perform reheat press molding, precision press molding, etc. using the preform , making optical components such as lenses and prisms.
• Both the glass preform and the optical element of the present invention are formed from the optical glass of the present invention described above.
• the glass preform of the present invention has the excellent characteristics of optical glass;
• the optical element of the present invention has the excellent characteristics of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.
• lenses include various lenses such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses whose lens surfaces are spherical or aspherical.
• optical element formed by the optical glass of the present invention can be used to manufacture optical instruments such as photographic equipment, vehicle-mounted equipment, imaging equipment, display equipment and monitoring equipment.
• the optical glass of the present invention has the properties of high refraction, high dispersion and low relative partial dispersion, it is especially suitable for telephoto lenses and high-definition interchangeable lenses.
• the optical glass shown in Table 1 - Table 4 was obtained by the manufacturing method of the said optical glass.
• the characteristics of each glass were measured by the test method according to the present invention, and the measurement results are shown in Tables 1 to 4.
• a concave meniscus lens, a convex meniscus lens, and a biconvex lens are produced by using the glasses obtained in optical glass Examples 1 to 40, for example, by means of grinding, or by means of press molding such as reheat press molding and precision press molding. , Bi-concave lenses, plano-convex lenses, plano-concave lenses and other lenses, prisms and other prefabricated parts.
• each preform is ground and polished to produce various lenses and prisms 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.
• An antireflection film may also be coated on the surface of the obtained optical element.
• optical elements produced by the above-mentioned optical element embodiments are optically designed and formed by using one or more optical elements to form optical components or optical assemblies, which can be used for example in imaging equipment, sensors, microscopes, medical technology, digital projection, communication, optical communication Technology/information transmission, optics/lighting in the automotive field, lithography, excimer lasers, wafers, computer chips and integrated circuits and electronic devices including such circuits and chips.

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