Optical glass and optical element

Abstract

The invention provides optical glass with a refractive index of 1.56-1.61, an Abbe number of 49-55 and relatively high hardness. The optical glass comprises the following components in percentage by weight: 34 to 46 percent of SiO2; 2 to 10 percent of B2O3; 20 to 32 percent of Al2O3; 5 to 15 percent of ZnO; 5 to 15 percent of MgO; 1% to 10% of Y2O3; and 0.5%-8% of TiO2, wherein the ratio of Al2O3 to Y2O3 is 2.5%-10.0%. Through reasonable component design, the optical glass obtained by the invention has expected refractive index and Abbe number, and also has relatively high hardness.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical glass, in particular to an optical glass with a refractive index of 1.56-1.61 and an Abbe number of 49-55. BACKGROUND

[0002] In recent years, optical instruments have developed rapidly in terms of digitization and high fineness, and in the fields of various optical instruments such as digital cameras or cameras, image playing (projection) machines such as projectors or projection televisions, and the fields of vehicle-mounted imaging, security monitoring, and the like, there is an increasing demand for reducing the number of optical elements such as lenses or prisms used in optical systems, and for lightening and miniaturizing the entire optical system.

[0003] In the optical glass for making optical elements, in particular, there is a high demand for a medium refractive index low dispersion glass having a refractive index of 1.56-1.61 and an Abbe number of 49-55, which can realize lightening and miniaturization of the entire optical system or chromatic aberration correction; and such optical glass is of great importance in the fields of optical design and optical communication for simplifying optical systems and improving imaging quality. At present, optical glasses satisfying such optical properties can be applied to the fields of vehicle-mounted imaging, security monitoring, and the like, and thus it is required that the optical glass has high hardness to resist the impact and abrasion of sand and stone during vehicle driving or under outdoor conditions, and to prolong the service life of the optical glass. SUMMARY

[0004] Based on the above reasons, the technical problem to be solved by the present application is to provide an optical glass with a refractive index of 1.56-1.61, an Abbe number of 49-55, and high hardness.

[0005] The technical solution adopted by the present application to solve the technical problem is:

[0006] (1) An optical glass, which comprises, in terms of weight percentage: SiO2: 34-46%; B2O3: 2-10%; Al2O3: 20-32%; ZnO: 5-15%; MgO: 5-15%; Y2O3: 1-10%; TiO2: 0.5-8%, wherein Al2O3 / Y2O3 is 2.5-10.0.

[0007] (2) The optical glass according to (1), which contains, in terms of weight percentage, further: ZrO2: 0 to 4%; and / or BaO: 0 to 4%; and / or SrO: 0 to 4%; and / or CaO: 0 to 4%; and / or La2O3: 0 to 5%; and / or Gd2O3: 0 to 4%; and / or Nb2O5: 0 to 3%; and / or WO3: 0 to 3%; and / or Ta2O5: 0 to 3%; and / or GeO2: 0 to 3%; and / or Rn2O: 0 to 3%; and / or fining agent: 0 to 2%, the Rn2O being one or more of Li2O, Na2O, K2O, and the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0008] (3) An optical glass which contains, in terms of weight percentage, SiO2, B2O3, Al2O3, ZnO, MgO, Y2O3, and TiO2, wherein Al2O3 / Y2O3 is 2.5 to 10.0, the optical glass having a refractive index n d of 1.56 to 1.61, an Abbe number v d of 49 to 55, and a Knoop hardness H K of 520 x 10 7 Pa or more.

[0009] (4) The optical glass according to (3), which contains, in terms of weight percentage: SiO2: 34 to 46%; and / or B2O3: 2 to 10%; and / or Al2O3: 20 to 32%; and / or ZnO: 5 to 15%; and / or MgO: 5 to 15%; and / or Y2O3: 1 to 10%; and / or TiO2: 0.5 to 8%; and / or ZrO2: 0 to 4%; and / or BaO: 0 to 4%; and / or SrO: 0 to 4%; and / or CaO: 0 to 4%; and / or La2O3: 0 to 5%; and / or Gd2O3: 0 to 4%; and / or Nb2O5: 0 to 3%; and / or WO3: 0 to 3%; and / or Ta2O5: 0 to 3%; and / or GeO2: 0 to 3%; and / or Rn2O: 0 to 3%; and / or fining agent: 0 to 2%, the Rn2O being one or more of Li2O, Na2O, K2O, and the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0010] (5) The optical glass according to any one of (1) to (4), which contains, in terms of weight percentage, one or more of the following six cases:

[0011] 1) Al2O3 / SiO2 is 0.46 to 0.85, preferably Al2O3 / SiO2 is 0.50 to 0.80, more preferably Al2O3 / SiO2 is 0.53 to 0.73;

[0012] 2) Al203 / Y203 is 3.0 to 8.0, preferably Al203 / Y203 is 3.5 to 7.0, more preferably Al203 / Y203 is 4.0 to 6.0;

[0013] 3) MgO / Y203 is 0.7 to 8.0, preferably MgO / Y203 is 1.0 to 6.0, more preferably MgO / Y203 is 1.2 to 4.0, further preferably MgO / Y203 is 1.3 to 3.0;

[0014] 4) MgO / B203 is 0.7 to 6.0, preferably MgO / B203 is 1.0 to 5.0, more preferably MgO / B203 is 1.0 to 3.5, further preferably MgO / B203 is 1.2 to 2.5;

[0015] 5) Y203 / (B203+ZnO) is 0.1 to 1.2, preferably Y203 / (B203+ZnO) is 0.1 to 1.0, more preferably Y203 / (B203+ZnO) is 0.15 to 0.8, further preferably Y203 / (B203+ZnO) is 0.2 to 0.6;

[0016] 6) Ti02 / ZnO is 0.1 to 1.5, preferably Ti02 / ZnO is 0.15 to 1.0, more preferably Ti02 / ZnO is 0.2 to 0.8, further preferably Ti02 / ZnO is 0.25 to 0.6.

[0017] (6) The optical glass according to any one of (1) to (4), which components are expressed in terms of weight percentage, satisfies one or more of the following 3 conditions:

[0018] 1) MgO / (Zr02+Ti02) is 0.5 to 10.0, preferably MgO / (Zr02+Ti02) is 1.0 to 8.0, more preferably MgO / (Zr02+Ti02) is 1.5 to 5.0, further preferably MgO / (Zr02+Ti02) is 1.5 to 3.5;

[0019] 2) CaO / ZnO is 0.6 or less, preferably CaO / ZnO is 0.5 or less, more preferably CaO / ZnO is 0.3 or less, further preferably CaO / ZnO is 0.1 or less;

[0020] 3) Rn20 / Al203 is 0.13 or less, preferably Rn20 / Al203 is 0.1 or less, more preferably Rn20 / Al203 is 0.08 or less, further preferably Rn20 / Al203 is 0.05 or less, the Rn20 being one or more of Li20, Na20, K20.

[0021] (7) The optical glass according to any one of (1) to (4), wherein the components are represented by weight percentage, and wherein: SiO2: 36 to 45%, preferably SiO2: 37 to 43%; and / or B2O3: 3 to 9%, preferably B2O3: 4 to 8%; and / or Al2O3: 21 to 30%, preferably Al2O3: 23 to 28%; and / or ZrO2: 0 to 3%, preferably ZrO2: 0 to 2%; and / or TiO2: 1 to 7%, preferably TiO2: 2 to 6%; and / or ZnO: 6 to 13%, preferably ZnO: 8 to 12%; and / or BaO: 0 to 2%, preferably BaO: 0 to 1%; and / or SrO: 0 to 2%, preferably SrO: 0 to 1%; and / or CaO: 0 to 2%, preferably CaO: 0 to 1%; and / or MgO: 6 to 13%, preferably MgO: 8 to 12%; and / or La2O3: 0 to 3%, preferably La2O3: 0 to 2%; and / or Y2O3: 2 to 8%, preferably Y2O3: 3 to 7%; and / or Gd2O3: 0 to 3%, preferably Gd2O3: 0 to 1%; and / or Nb2O5: 0 to 2%, preferably Nb2O5: 0 to 1%; and / or WO3: 0 to 2%, preferably WO3: 0 to 1%; and / or Ta2O5: 0 to 2%, preferably Ta2O5: 0 to 1%; and / or GeO2: 0 to 2%, preferably GeO2: 0 to 1%; and / or Rn2O: 0 to 2%, preferably Rn2O: 0 to 1%; and / or a fining agent: 0 to 1%, preferably a fining agent: 0 to 0.5%, the Rn2O being one or more of Li2O, Na2O, K2O, and the fining agent being one or more of Sb2O3, SnO2, CeO2.

[0022] (8) The optical glass according to any one of (1) to (4), wherein the components do not contain BaO; and / or do not contain CaO; and / or do not contain SrO; and / or do not contain Gd2O3; and / or do not contain Nb2O5; and / or do not contain WO3; and / or do not contain Ta2O5; and / or do not contain GeO2; and / or do not contain Li2O; and / or do not contain Na2O; and / or do not contain K2O; and / or do not contain P2O5; and / or do not contain Fe2O3; and / or do not contain F.

[0023] (9) The optical glass according to any one of (1) to (4), wherein the optical glass has a refractive index n d of 1.56 to 1.61, preferably 1.57 to 1.60, more preferably 1.58 to 1.60, and an Abbe number v d of 49 to 55, preferably 50 to 54, more preferably 51 to 53.5.

[0024] (10) The optical glass according to any one of (1) to (4), wherein the optical glass has a thermal expansion coefficient a 20 / 300℃30×10 -7 / K~45×10 -7 / K, preferably 32×10 -7 / K~42×10 -7 / K, more preferably 35×10 -7 / K~40×10 -7 / K; and / or acid resistance stability D A 3 or more, preferably 2 or more; and / or water resistance stability D W 3 or more, preferably 2 or more; and / or Young's modulus E is 91 GPa or more, preferably 93 GPa or more, more preferably 95 GPa or more; and / or transition temperature T g 680°C or higher, preferably 700°C or higher, more preferably 710°C or higher, further preferably 710-735°C; and / or density ρ is 3.00 g / cm 3 Below, preferably 2.90g / cm 3 Below, more preferably 2.85g / cm 3 Below; and / or light transmittance T at 550nm 550nm 85.0% or more, preferably 87.0% or more, more preferably 89.0% or more; and / or the light transmittance T at 355 nm 355nm 80.0% or more, preferably 82.0% or more, more preferably 84.0% or more; and / or Knoop hardness H K 520×10 7 Pa or more, preferably 540×10 7 Pa or more, more preferably 560×10 7 Pa and above.

[0025] (11) A glass preform made of the optical glass described in any one of (1) to (10).

[0026] (12) An optical element made of the optical glass described in any one of (1) to (10).

[0027] (13) An optical instrument comprising the optical glass described in any one of (1) to (10), or the optical element described in (12).

[0028] The beneficial effects of the present invention are: through reasonable component design, the optical glass obtained by the present invention has a desired refractive index and Abbe number, and also has high hardness. DETAILED DESCRIPTION

[0029] Hereinafter, the embodiments of the optical glass of the present application will be described in detail, but the present application is not limited to the following embodiments, and can be implemented by making appropriate changes within the scope of the objects of the present application. Furthermore, as for the repeatedly described parts, although there are appropriately omitted descriptions, the gist of the application is not limited thereby. In the present specification, the optical glass of the present application will be sometimes referred to simply as glass.

[0030] [Optical glass]

[0031] Hereinafter, the ranges of the components of the optical glass of the present application will be described. In the present application, unless otherwise specified, the content, the total content, and the overall content of each component are all expressed in terms of weight percent (wt%), i.e., the content, the total content, and the overall content of each component are expressed in terms of weight percent with respect to the total amount of the glass substance in terms of the composition of oxides. Here, the "composition of oxides" refers to the case where, when oxides, complex salts, and hydroxides, etc., which are used as raw materials of the constituent components of the optical glass of the present application, are melted, they are decomposed and converted into oxides.

[0032] Unless otherwise indicated in a specific case, the numerical ranges set forth in the present application include the upper and lower limits, "and / or" includes both the end points, 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" means only A, or only B, or both A and B.

[0033] <Essential components and optional components>

[0034] SiO2is a main component constituting the glass framework, and has an important influence on the high-temperature viscosity and the coefficient of thermal expansion of the glass. If the content of SiO2is less than 34%, the coefficient of thermal expansion of the glass increases, and it is difficult to achieve the desired coefficient of thermal expansion of the present application, and the transition temperature and the resistance to devitrification decrease. If the content of SiO2exceeds 46%, the high-temperature viscosity of the glass increases, and it is not easy to obtain a large-size high-quality glass. Therefore, in the present application, the content of SiO2is 34 to 46%, preferably 36 to 45%, and more preferably 37 to 43%.

[0035] Al2O3can increase the Young's modulus of the glass, and is advantageous in improving the warpage and breakage resistance of the glass, and can also reduce the coefficient of thermal expansion of the glass. In the present application, the above effects are obtained by containing 20% or more of Al2O3, but if the content of Al2O3is too high, the melting property of the glass decreases, and the resistance to crystallization decreases. Therefore, in the present application, the content of Al2O3is 20 to 32%, preferably 21 to 30%, and more preferably 23 to 28%.

[0036] In some embodiments, the ratio between the content of Al2O3 and the content of SiO2, Al2O3 / SiO2, is controlled in the range of 0.46 to 0.85, so as to improve the Young's modulus of the glass while obtaining a suitable coefficient of thermal expansion. Therefore, it is preferred that Al2O3 / SiO2 is in the range of 0.46 to 0.85, more preferably Al2O3 / SiO2 is in the range of 0.50 to 0.80, and further preferably Al2O3 / SiO2 is in the range of 0.53 to 0.73.

[0037] B2O3 can improve the melting property and devitrification resistance of the glass. In the present application, B2O3 is contained in an amount of 2% or more to obtain the above-mentioned effects, but if the content of B2O3 exceeds 10%, it is difficult to obtain a desired coefficient of thermal expansion of the glass. Therefore, the content of B2O3 in the present application is in the range of 2 to 10%, preferably in the range of 3 to 9%, and more preferably in the range of 4 to 8%.

[0038] ZnO can improve the melting property of the glass and adjust the high-temperature viscosity of the glass, but if the content of ZnO is too high, the transition temperature of the glass decreases, the glass is not suitable for use in a high-temperature environment, and the chemical stability of the glass decreases. Therefore, the content of ZnO is in the range of 5 to 15%, preferably in the range of 6 to 13%, and more preferably in the range of 8 to 12%.

[0039] MgO can improve the light transmittance of the glass and decrease the density of the glass, but if the content of MgO is too high, the chemical stability of the glass decreases. Therefore, the content of MgO in the present application is in the range of 5 to 15%, preferably in the range of 6 to 13%, and more preferably in the range of 8 to 12%.

[0040] In some embodiments, the ratio between the content of MgO and the content of B2O3, MgO / B2O3, is controlled in the range of 0.7 to 6.0, so as to improve the acid resistance of the glass while obtaining a suitable coefficient of thermal expansion. Therefore, it is preferred that MgO / B2O3 is in the range of 0.7 to 6.0, more preferably MgO / B2O3 is in the range of 1.0 to 5.0, further preferably MgO / B2O3 is in the range of 1.0 to 3.5, and more further preferably MgO / B2O3 is in the range of 1.2 to 2.5.

[0041] CaO can improve the melting property of the glass, but if the content of CaO is too high, the anti-crystallization property of the glass decreases. Therefore, the content of CaO is in the range of 0 to 4%, preferably in the range of 0 to 2%, and more preferably in the range of 0 to 1%. In some embodiments, it is further preferred that CaO is not contained.

[0042] In some embodiments, the ratio between the content of CaO and the content of ZnO, CaO / ZnO, is controlled to be 0.6 or less, which can reduce the density of the glass while preventing the water resistance of the glass from deteriorating. Therefore, CaO / ZnO is preferably 0.6 or less, more preferably CaO / ZnO is 0.5 or less, further preferably CaO / ZnO is 0.3 or less, and more further preferably CaO / ZnO is 0.1 or less.

[0043] SrO can adjust the high-temperature viscosity and melting property of the glass, but if the content of SrO is too high, the chemical stability of the glass decreases. Therefore, the content of SrO is 0-4%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that SrO is not contained.

[0044] BaO can increase the refractive index of the glass and adjust the high-temperature viscosity of the glass, but if the content of BaO is too high, the thermal expansion coefficient and the density of the glass increase. Therefore, the content of BaO in the present application is 0-4%, preferably 0-2%, and more preferably 0-1%. In some embodiments, it is further preferred that BaO is not contained.

[0045] TiO2 can increase the refractive index and dispersion of the glass and adjust the thermal expansion coefficient of the glass. However, if the content of TiO2 exceeds 8%, the light transmittance of the glass rapidly decreases, making subsequent laser stripping difficult, and the thermal expansion coefficient of the glass is difficult to meet the design requirements. Therefore, the content of TiO2 is 0.5-8%, preferably 1-7%, and more preferably 2-6%.

[0046] In some embodiments, the ratio between the content of TiO2 and the content of ZnO, TiO2 / ZnO, is controlled to be in the range of 0.1-1.5, which can increase the hardness of the glass while preventing the acid resistance of the glass from deteriorating. Therefore, TiO2 / ZnO is preferably 0.1-1.5, more preferably TiO2 / ZnO is 0.15-1.0, further preferably TiO2 / ZnO is 0.2-0.8, and more further preferably TiO2 / ZnO is 0.25-0.6.

[0047] ZrO2 can increase the refractive index and chemical stability of the glass, reduce the thermal expansion coefficient of the glass, and optimize the high-temperature viscosity, but when the content of ZrO2 is too high, the devitrification resistance of the glass decreases and the ultraviolet light transmittance decreases. Therefore, the content of ZrO2 is 0-4%, preferably 0-3%, and more preferably 0-2%.

[0048] In some embodiments, the ratio between the content of MgO and the total content of ZrO2 and TiO2, MgO / (ZrO2+TiO2), is controlled in the range of 0.5 to 10.0, which can reduce the density of the glass while improving the water resistance of the glass. Therefore, it is preferred that MgO / (ZrO2+TiO2) is in the range of 0.5 to 10.0, more preferably, MgO / (ZrO2+TiO2) is in the range of 1.0 to 8.0, further preferably, MgO / (ZrO2+TiO2) is in the range of 1.5 to 5.0, and more further preferably, MgO / (ZrO2+TiO2) is in the range of 1.5 to 3.5.

[0049] La2O3 can increase the refractive index and Abbe number of the glass, and improve the chemical stability and devitrification resistance of the glass. However, if the content of La2O3 is too high, the ultraviolet light transmittance of the glass will decrease. Therefore, the content of La2O3 is in the range of 0 to 5%, preferably in the range of 0 to 3%, and more preferably in the range of 0 to 2%.

[0050] Y2O3 can increase the refractive index and devitrification resistance of the glass, and increase the Young's modulus of the glass. However, if the content of Y2O3 is too high, the chemical stability and ultraviolet light transmittance of the glass will decrease. Therefore, the content of Y2O3 is in the range of 1 to 10%, preferably in the range of 2 to 8%, and more preferably in the range of 3 to 7%.

[0051] In some embodiments, the ratio between the content of Al2O3 and the content of Y2O3, Al2O3 / Y2O3, is controlled in the range of 2.5 to 10.0, which can improve the hardness of the glass while preventing the transition temperature of the glass from deteriorating. Therefore, it is preferred that Al2O3 / Y2O3 is in the range of 2.5 to 10.0, more preferably, Al2O3 / Y2O3 is in the range of 3.0 to 8.0, further preferably, Al2O3 / Y2O3 is in the range of 3.5 to 7.0, and more further preferably, Al2O3 / Y2O3 is in the range of 4.0 to 6.0.

[0052] In some embodiments, the ratio between the content of MgO and the content of Y2O3, MgO / Y2O3, is controlled in the range of 0.7 to 8.0, which is beneficial to improve the light transmittance of the glass and reduce the density of the glass. Therefore, it is preferred that MgO / Y2O3 is in the range of 0.7 to 8.0, more preferably, MgO / Y2O3 is in the range of 1.0 to 6.0, further preferably, MgO / Y2O3 is in the range of 1.2 to 4.0, and more further preferably, MgO / Y2O3 is in the range of 1.3 to 3.0.

[0053] In some embodiments, the ratio Y2O3 / (B2O3+ZnO) between the content of Y2O3 and the total content of B2O3 and ZnO (B2O3+ZnO) is controlled in the range of 0.1 to 1.2, which can improve the Young's modulus of the glass while preventing the light transmittance of the glass from deteriorating. Therefore, it is preferable that Y2O3 / (B2O3+ZnO) be 0.1 to 1.2, more preferable that Y2O3 / (B2O3+ZnO) be 0.1 to 1.0, further preferable that Y2O3 / (B2O3+ZnO) be 0.15 to 0.8, and more further preferable that Y2O3 / (B2O3+ZnO) be 0.2 to 0.6.

[0054] Gd2O3 can improve the refractive index and chemical stability of the glass, but if its content is too high, the devitrification resistance of the glass deteriorates and the density increases. Therefore, the content of Gd2O3 is 0 to 4%, preferably 0 to 3%, and more preferably 0 to 1%. In some embodiments, it is further preferable that Gd2O3 not be contained.

[0055] Nb2O5 is a high-refractive high-dispersive component, which can improve the refractive index and devitrification resistance of the glass and reduce the thermal expansion coefficient of the glass, but if its content is too high, the ultraviolet light transmittance of the glass decreases and the thermal expansion coefficient of the glass is too low. Therefore, the content of Nb2O5 is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is further preferable that Nb2O5 not be contained.

[0056] WO3 is a high-refractive high-dispersive component, which can improve the refractive index and devitrification resistance of the glass, but if its content is too high, the visible light transmittance of the glass decreases. Therefore, the content of WO3 is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is further preferable that WO3 not be contained.

[0057] Ta2O5 can improve the refractive index of the glass, but its high content can greatly increase the cost of the glass and deteriorate the melting performance of the glass and increase the density. Therefore, the content of Ta2O5 is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is further preferable that Ta2O5 not be contained.

[0058] GeO2 can improve the refractive index and devitrification resistance of the glass, but its high content can reduce the chemical stability of the glass and is not conducive to the control of the cost of the raw materials of the glass. Therefore, the content of GeO2 is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is further preferable that GeO2 not be contained.

[0059] Rn2O (one or more of Li2O, Na2O, K2O) can lower the glass melting temperature and density, but when the content is high, the transition temperature of the glass is lowered. On the other hand, when the glass containing Rn2O is used as a carrier, alkali metal ions Li + , Na + , K + may enter the single crystal silicon substrate and contaminate the chip circuit. Therefore, the content of Rn2O in the present application is 0 to 3%, preferably 0 to 2%, and more preferably 0 to 1%. In some embodiments, it is further preferred that Li2O is not contained; and / or Na2O is not contained; and / or K2O is not contained.

[0060] In some embodiments, the ratio between the content of Rn2O and the content of Al2O3, Rn2O / Al2O3, is controlled to be 0.13 or less, which can make the glass have a good coefficient of thermal expansion while preventing the Young's modulus of the glass from deteriorating. Therefore, it is preferred that Rn2O / Al2O3 is 0.13 or less, more preferably Rn2O / Al2O3 is 0.1 or less, further preferably Rn2O / Al2O3 is 0.08 or less, and more further preferably Rn2O / Al2O3 is 0.05 or less.

[0061] In the present application, one or more components of 0 to 2% of Sb2O3, SnO2, CeO2 are contained as fining agents to improve the fining effect of the glass. It is preferred that the content of the fining agent is 0 to 1%, and more preferably 0 to 0.5%.

[0062] <Components not to be contained>

[0063] P2O5 can easily generate microsegregation in the glass, which scatters a portion of short wavelengths and makes it difficult to achieve the designed transmittance. Therefore, in some embodiments, it is preferred that P2O5 is not contained.

[0064] Fe2O3 can cause the glass to be colored, which is not conducive to achieving excellent light transmittance of the glass. Therefore, in some embodiments, it is preferred that Fe2O3 is not contained.

[0065] F (fluorine) can lower the transition temperature of the glass, and volatilize during the glass melting process, causing the glass components to become unstable and the quality of the glass to be lowered. Therefore, in some embodiments, it is preferred that F is not contained.

[0066] In the glass of the present invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained alone or in combination in small amounts, the glass will be colored and absorb specific wavelengths in the visible light region, thereby weakening the property of the present invention of improving visible light transmittance. Therefore, it is preferably substantially free of these components, especially for glass requiring transmittance at wavelengths in the visible light region.

[0067] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly regulated as hazardous chemicals in recent years. Environmental protection measures are essential not only during glass manufacturing but also during processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to virtually eliminate these oxides, except where they are unavoidably present. This ensures that the glass contains virtually no pollutants. Therefore, the glass of the present invention can be manufactured, processed, and disposed of even without implementing specific environmental measures.

[0068] In order to achieve environmental friendliness, the glass of the present invention preferably does not contain As2O3 and PbO.

[0069] The "does not contain" and "0%" recorded herein means that the compound, molecule or element is not intentionally added as a raw material to the glass of the present invention; however, as raw materials and / or equipment for producing glass, there may be certain impurities or components that are not intentionally added and may be contained in small amounts or trace amounts in the final glass. This situation is also within the scope of protection of the patent of the present invention.

[0070] Next, the properties of the optical glass of the present invention will be described.

[0071] <Refractive Index and Abbe Number>

[0072] The refractive index of optical glass (n d ) and Abbe number (ν d ) Tested in accordance with the method specified in the national standard "GB / T 7962.1-2010".

[0073] In some embodiments, the refractive index (n d ) has a lower limit of 1.56, preferably 1.57, and more preferably 1.58. In some embodiments, the refractive index (n d ) is 1.61, and the preferred upper limit is 1.60.

[0074] In some embodiments, the Abbe number (ν d ) is 49, preferably 50, and more preferably 51. In some embodiments, the Abbe number (νd ) is 55, preferably upper limit is 54, more preferably upper limit is 53.5.

[0075] <COEFFICIENT OF THERMAL EXPANSION>

[0076] The coefficient of thermal expansion (α 20 / 300℃ ) of the optical glass is tested according to the method specified in the national standard GB / T 7962.16-2010 for data from 20 to 300℃.

[0077] In some embodiments, the coefficient of thermal expansion of the optical glass is not too high or too low. When the optical glass is used in the field of semiconductor packaging, it is necessary to be thermally matched with the packaging medium (such as resin material) to prevent the interface layer stress from rising due to the large difference in the coefficient of thermal expansion, which may cause cracking.

[0078] In some embodiments, the coefficient of thermal expansion (α 20 / 300℃ ) of the optical glass of the present application is 30x10 -7 / K to 45x10 -7 / K, preferably 32x10 -7 / K to 42x10 -7 / K, and more preferably 35x10 -7 / K to 40x10 -7 / K.

[0079] <ACID RESISTANCE>

[0080] The acid resistance (D A ) of the optical glass (powder method) is tested according to the method specified in the national standard GB / T 17129. In this specification, the acid resistance is sometimes referred to as acid resistance or acid stability. The better the acid resistance of the optical glass, the less likely the glass will fail in the application process in a strong acidic environment.

[0081] In some embodiments, the acid resistance (D A ) of the optical glass of the present application is class 3 or above, preferably class 2 or above.

[0082] <HYDROLYTIC RESISTANCE>

[0083] The hydrolytic resistance (D W ) of the optical glass (powder method) is tested according to the method specified in the national standard GB / T 17129. In this specification, the hydrolytic resistance is sometimes referred to as water resistance or water stability. The better the water resistance of the optical glass, the less likely the glass will be eroded by water in the application process.

[0084] In some embodiments, the hydrolytic resistance (D W ) of the optical glass of the present application is class 3 or above, preferably class 2 or above.

[0085] <Young's modulus>

[0086] The Young's modulus (E) of the optical glass is calculated by using the following formula:

[0087] The Young's modulus (E) of the optical glass is calculated by using the following formula:

[0088]

[0089] wherein G = V S 2 ρ

[0090] wherein:

[0091] E is the Young's modulus, Pa;

[0092] G is the shear modulus, Pa;

[0093] V T is the longitudinal wave velocity, m / s;

[0094] V S is the transverse wave velocity, m / s;

[0095] ρ is the density of the glass, g / cm 3 .

[0096] The greater the Young's modulus of the optical glass, the less likely the optical glass is to deform during application. In particular, the greater the Young's modulus of the optical glass, the less likely the stress link in the packaging process in the field of semiconductor manufacturing is to warp and break.

[0097] In some embodiments, the Young's modulus (E) of the optical glass of the present application is greater than or equal to 91 GPa, preferably greater than or equal to 93 GPa, and more preferably greater than or equal to 95 GPa.

[0098] <Transition temperature>

[0099] The transition temperature (T g ) of the optical glass is tested according to the method specified in the national standard GB / T 7962.16-2010.

[0100] If the transition temperature of the optical glass is low, the heat resistance of the glass decreases, and the glass is prone to softening deformation when applied in a high-temperature environment. If the transition temperature of the glass is too high, it will cause design difficulties in the heat resistance of the precision annealing equipment, resulting in a decrease in the reliability of the precision annealing equipment. In particular, when a large-diameter glass blank is precision annealed, it needs to be kept at a temperature near the transition temperature for a long time. If the transition temperature is too high, the reliability of the precision annealing equipment will be greatly reduced.

[0101] In some embodiments, the transition temperature (T g ) of the optical glass of the present application is above 680℃, preferably above 700℃, more preferably above 710℃, and further preferably between 710℃ and 735℃.

[0102] <Density>

[0103] The density (p) of the optical glass is tested according to the method specified in the national standard GB / T 7962.20-2010. The lower the density of the optical glass, the more conducive to the light weight of the application terminal.

[0104] In some embodiments, the density (p) of the optical glass of the present application is 3.00g / cm 3 , preferably 2.90g / cm 3 , more preferably 2.85g / cm 3 , and further preferably 2.80g / cm

[0105] <Light transmittance>

[0106] The light transmittance of the optical glass is tested according to the following method: the glass sample to be tested is processed to a certain thickness and the opposite surfaces are parallel polished, and the method specified in the national standard GB / T 7962.12-2010 is used for testing. In the present application, the optical glass is processed to a thickness of 1±0.1mm, and the light transmittance (T 550nm ) at 550nm and the light transmittance (T 355nm ) at 355nm are tested.

[0107] The higher the transmittance of the optical glass, the easier it is to achieve high definition of optical instruments. When the optical glass is applied to the field of semiconductor manufacturing, the higher the light transmittance of the optical glass at 550nm, the more efficient and accurate the detection of the optical detection equipment during the packaging process; the higher the light transmittance of the optical glass at 355nm, the higher the efficiency of the debonding during the packaging process, and the smaller the risk of warping of the packaged wafer.

[0108] In some embodiments, the light transmittance (T 550nm ) of the optical glass of the present application at 550nm is above 85.0%, preferably above 87.0%, and more preferably above 89.0%.

[0109] In some embodiments, the light transmittance (T 355nm ) of the optical glass of the present application at 355nm is above 80.0%, preferably above 82.0%, and more preferably above 84.0%.

[0110] <Hardness>

[0111] The hardness (H K) according to the test method stipulated in the national standard "GB / T 7962.18-2010".

[0112] In some embodiments, the optical glass of the present application has a Knoop hardness (H K ) of 520 x 10 7 Pa or more, preferably 540 x 10 7 Pa or more, more preferably 560 x 10 7 Pa or more.

[0113] [Manufacturing method]

[0114] The manufacturing method of the optical glass of the present application is as follows: the optical glass of the present application uses carbonates, nitrates, sulfates, hydroxides, oxides, fluorides, etc. as raw materials, and after batching according to conventional methods, the prepared batch is put into a melting furnace at 1300-1500°C for melting, and after clarification, stirring and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained, which is cast in a mold and annealed to form. Those skilled in the art can appropriately select raw materials, process methods and process parameters according to actual needs.

[0115] [Glass preform and optical element]

[0116] The glass preform can be made from the manufactured optical glass using, for example, direct drop forming, or machining means, or molding means such as hot pressing. That is, the glass preform can be made by directly precision drop forming the molten optical glass into a glass precision preform, or by machining such as grinding and polishing, or by reheating and pressing the preform blank for molding from the optical glass, and then machining the preform blank. It should be noted that the means for preparing the glass preform are not limited to the above means.

[0117] As described above, the optical glass of the present application is useful for various optical elements and optical designs, and it is particularly preferable to form a preform blank from the optical glass of the present application, and to use the preform blank for re-pressing, precision stamping, etc. to make optical elements such as lenses, prisms, etc.

[0118] The glass preform and the optical element of the present application are both formed from the above-mentioned optical glass of the present application. The glass preform of the present application has the excellent properties possessed by the optical glass; the optical element of the present application has the excellent properties possessed by the optical glass, and can provide various optical elements such as lenses, prisms, etc. with high optical value.

[0119] As examples of lenses, various lenses such as concave meniscus lenses, convex meniscus lenses, lenticular lenses, double concave lenses, plano-convex lenses, plano-concave lenses, etc. having spherical or aspherical lens surfaces can be given.

[0120] [Optical instrument]

[0121] The optical element formed of the optical glass of the present application can be used for optical instruments such as photographic equipment, video recording equipment, projection equipment, display equipment, vehicle-mounted equipment, and monitoring equipment.

[0122] The optical glass of the present application can be used for manufacturing a packaging carrier (substrate material) for semiconductor processing, because of the excellent properties described above.

[0123] Examples

[0124] [Optical glass examples]

[0125] In order to further clarify and illustrate the technical solutions of the present application, the following non-limiting examples are provided.

[0126] In this example, the optical glass having the composition shown in Tables 1 to 3 was obtained by the manufacturing method of the optical glass described above. In addition, the properties of each glass were measured by the test methods described in the present application, and the measurement results are shown in Tables 1 to 3.

[0127] Table 1.

[0128]

[0129]

[0130]

[0131] Table 2.

[0132]

[0133]

[0134] Table 3.

[0135]

[0136]

[0137] [Glass preform examples]

[0138] The glass obtained in optical glass examples 1 to 18 was used to manufacture various lenses such as concave meniscus lenses, convex meniscus lenses, double convex lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, and prisms, and the like, using a grinding process, or a molding process such as reheat press molding, precision press molding, and the like.

[0139] [Optical element examples]

[0140] The preforms obtained in the above glass preform examples are annealed to reduce the internal stress of the glass while fine-tuning the refractive index so that the refractive index and other optical properties reach the desired values.

[0141] Next, each preform is ground and polished to produce various lenses such as concave meniscus lenses, convex meniscus lenses, lenticular lenses, double concave lenses, plano-convex lenses, and plano-concave lenses, and prisms. The surface of the obtained optical element can also be coated with an anti-reflection film.

[0142] <Optical instrument examples>

[0143] The optical elements obtained in the above optical element examples are used in optical design to form optical components or optical assemblies by using one or more optical elements, and can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communication, optical communication technology / information transmission, optics / illumination in the automotive field, photolithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips.

Claims

1. Optical glass, characterized in that Its components, expressed in weight percentage, include: SiO2: 34-46%; B2O3: 2-10%; Al2O3: 20-32%; ZnO: 5-15%; MgO: 5-15%; Y2O3: 1-10%; TiO2: 0.5-8%, wherein Al2O3 / Y2O3 is 2.5-10.

0.

2. The optical glass according to claim 1, wherein Its components, expressed in weight percentage, further contain: ZrO2: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-4%; and / or CaO: 0-4%; and / or La2O3: 0-5%; and / or Gd2O3: 0-4%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or GeO2: 0-3%; and / or Rn2O: 0-3%; and / or a clarifier: 0-2%, wherein the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

3. Optical glass, characterized in that The components include SiO2, B2O3, Al2O3, ZnO, MgO, Y2O3 and TiO2, and the components are expressed in weight percentage, wherein Al2O3 / Y2O3 is 2.5 to 10.0, and the refractive index of the optical glass is n d is 1.56~1.61, Abbe number ν d The transition temperature is 49-55. g Above 680℃, Knoop hardness H K 520×10 7 Pa and above.

4. The optical glass according to claim 3, wherein The composition is expressed in weight percentage and contains: SiO2: 34-46%; and / or B2O3: 2-10%; and / or Al2O3: 20-32%; and / or ZnO: 5-15%; and / or MgO: 5-15%; and / or Y2O3: 1-10%; and / or TiO2: 0.5-8%; and / or ZrO2: 0-4%; and / or BaO: 0-4%; and / or SrO: 0-4%; and / or CaO: 0-4%; and / or La2O3: 0-5%; and / or Gd2O3: 0-4%; and / or Nb2O5: 0-3%; and / or WO3: 0-3%; and / or Ta2O5: 0-3%; and / or GeO2: 0-3%; and / or Rn2O: 0-3%; and / or clarifier: 0-2%, wherein the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

5. The optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following six conditions: 1) Al2O3 / SiO2 is 0.46 to 0.85, preferably Al2O3 / SiO2 is 0.50 to 0.80, and more preferably Al2O3 / SiO2 is 0.53 to 0.73; 2) Al2O3 / Y2O3 is 3.0-8.0, preferably Al2O3 / Y2O3 is 3.5-7.0, more preferably Al2O3 / Y2O3 is 4.0-6.0; 3) MgO / Y2O3 is 0.7 to 8.0, preferably MgO / Y2O3 is 1.0 to 6.0, more preferably MgO / Y2O3 is 1.2 to 4.0, and further preferably MgO / Y2O3 is 1.3 to 3.0; 4) MgO / B2O3 is 0.7 to 6.0, preferably MgO / B2O3 is 1.0 to 5.0, more preferably MgO / B2O3 is 1.0 to 3.5, and further preferably MgO / B2O3 is 1.2 to 2.5; 5) Y2O3 / (B2O3+ZnO) is 0.1 to 1.2, preferably Y2O3 / (B2O3+ZnO) is 0.1 to 1.0, more preferably Y2O3 / (B2O3+ZnO) is 0.15 to 0.8, and further preferably Y2O3 / (B2O3+ZnO) is 0.2 to 0.6; 6) TiO2 / ZnO is 0.1 to 1.5, preferably TiO2 / ZnO is 0.15 to 1.0, more preferably TiO2 / ZnO is 0.2 to 0.8, and further preferably TiO2 / ZnO is 0.25 to 0.

6.

6. The optical glass according to any one of claims 1 to 4, characterized in that: Its components are expressed in weight percentage and meet one or more of the following three conditions: 1) MgO / (ZrO2+TiO2) is 0.5 to 10.0, preferably MgO / (ZrO2+TiO2) is 1.0 to 8.0, more preferably MgO / (ZrO2+TiO2) is 1.5 to 5.0, and further preferably MgO / (ZrO2+TiO2) is 1.5 to 3.5; 2) CaO / ZnO is 0.6 or less, preferably CaO / ZnO is 0.5 or less, more preferably CaO / ZnO is 0.3 or less, and further preferably CaO / ZnO is 0.1 or less; 3) Rn2O / Al2O3 is less than 0.13, preferably Rn2O / Al2O3 is less than 0.1, more preferably Rn2O / Al2O3 is less than 0.08, and further preferably Rn2O / Al2O3 is less than 0.05, and the Rn2O is one or more of Li2O, Na2O, and K2O.

7. The optical glass according to any one of claims 1 to 4, characterized in that: The components are expressed in weight percentage, wherein: SiO2: 36-45%, preferably SiO2: 37-43%; and / or B2O3: 3-9%, preferably B2O3: 4-8%; and / or Al2O3: 21-30%, preferably Al2O3: 23-28%; and / or ZrO2: 0-3%, preferably ZrO2: 0-2%; and / or TiO2: 1-7%, preferably TiO2: 2-6%; and / or ZnO: 6-13%, preferably ZnO: 8-12%; and / or BaO: 0-2%, preferably BaO: 0-1%; and / or SrO: 0-2%, preferably SrO: 0-1%; and / or CaO: 0-2%, preferably CaO: 0-1%; and / or MgO: 6-13%, preferably MgO: 8-12%; and / or La2O3: 0 ~3%, preferably La2O3: 0~2%; and / or Y2O3: 2~8%, preferably Y2O3: 3~7%; and / or Gd2O3: 0~3%, preferably Gd2O3: 0~1%; and / or Nb2O5: 0~2%, preferably Nb2O5: 0~1%; and / or WO3: 0~2%, preferably WO3: 0~1%; and / or Ta2O5: 0~2%, preferably Ta2O5: 0~1%; and / or GeO2: 0~2%, preferably GeO2: 0~1%; and / or Rn2O: 0~2%, preferably Rn2O: 0~1%; and / or clarifier: 0~1%, preferably clarifier: 0~0.5%, wherein the Rn2O is one or more of Li2O, Na2O, and K2O, and the clarifier is one or more of Sb2O3, SnO2, and CeO2.

8. The optical glass according to any one of claims 1 to 4, characterized in that: Its components do not contain BaO; and / or do not contain CaO; and / or do not contain SrO; and / or do not contain Gd2O3; and / or do not contain Nb2O5; and / or do not contain WO3; and / or do not contain Ta2O5; and / or do not contain GeO2; and / or do not contain Li2O; and / or do not contain Na2O; and / or do not contain K2O; and / or do not contain P2O5; and / or do not contain Fe2O3; and / or do not contain F.

9. The optical glass according to any one of claims 1 to 4, characterized in that: The refractive index n of the optical glass d The molecular weight is 1.56 to 1.61, preferably 1.57 to 1.60, more preferably 1.58 to 1.60, and the Abbe number νd is 49 to 55, preferably 50 to 54, more preferably 51 to 53.

5.

10. The optical glass according to any one of claims 1 to 4, characterized in that: The thermal expansion coefficient of the optical glass is α 20 / 300℃ 30×10 -7 / K~45×10 -7 / K, preferably 32×10 -7 / K~42×10 -7 / K, more preferably 35×10 -7 / K~40×10 -7 / K; and / or acid resistance stability D A 3 or more, preferably 2 or more; and / or water resistance stability D W 3 or more, preferably 2 or more; and / or Young's modulus E is 91 GPa or more, preferably 93 GPa or more, more preferably 95 GPa or more; and / or transition temperature T g 680°C or higher, preferably 700°C or higher, more preferably 710°C or higher, further preferably 710-735°C; and / or density ρ is 3.00 g / cm 3 Below, preferably 2.90g / cm 3 Below, more preferably 2.85g / cm 3 Below; and / or light transmittance T at 550nm 550nm 85.0% or more, preferably 87.0% or more, more preferably 89.0% or more; and / or the light transmittance T at 355 nm 355nm 80.0% or more, preferably 82.0% or more, more preferably 84.0% or more; and / or Knoop hardness H K 520×10 7 Pa or more, preferably 540×10 7 Pa or more, more preferably 560×10 7 Pa or above.

11. A glass preform, characterized in that Made of the optical glass according to any one of claims 1 to 10.

12. An optical element, characterized in that Made of the optical glass according to any one of claims 1 to 10.

13. An optical instrument, characterized in that A device comprising the optical glass according to any one of claims 1 to 10, or an optical element according to claim 12.

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