Optical glass, glass preforms, optical elements and optical instruments

Abstract

The present invention provides an optical glass, the optical glass comprising the following components in weight percent: 2 O 5 : 10~30%, Bi 2 O 3 : 16~35%, Nb 2 O 5 : 20-40%, WO 3 : 5 to 20%, of which Bi 2 O 3 / Nb 2 O 5 is 0.5 to 1.5. By rationally designing the components, the optical glass obtained by the present invention can obtain the expected refractive index and Abbe number, and at the same time, has a relatively low thermal expansion coefficient and excellent crystallization resistance.

Description

Technical Field

[0001] The present invention relates to optical glass, and particularly to optical glass having a refractive index of 1.88 to 1.96 and an Abbe number of 25 or less, and a glass preform, an optical element, and an optical device made therefrom.

Background Art

[0002] In recent years, with the development of fields such as optoelectronic information and digital display, optical elements used in optical systems are required to be miniaturized, lightweight, and high-performance. High-refractive-index and high-dispersion optical glass can be used in combination with low-dispersion optical glass, thereby effectively removing chromatic aberration and secondary spectrum, shortening the optical length of the lens, and realizing miniaturization of the imaging system. Therefore, the application prospects of such glass are very broad.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The greater the thermal expansion coefficient of optical glass, the worse the thermal shock resistance of the glass, and it is more likely to crack due to thermal expansion and cold contraction during hot and cold processing, resulting in a decrease in the yield rate of the glass. In addition, optical glass having excellent crystallization resistance can reduce the difficulty of glass production and hot processing. In the prior art, the crystallization resistance, such as that of the optical glass disclosed in Patent Document 1 (Specification of Chinese Patent Application Publication No. 101746953) having a refractive index of 1.91 to 1.96 and an Abbe number of 17.5 to 21, and the high-refractive-index and high-dispersion optical glass disclosed in Patent Document 2 (Specification of Chinese Patent No. 1332901), still has room for further improvement.

[0005] The technical problem to be solved by the present invention is to provide a high refractive index and high dispersion optical glass having a relatively low coefficient of thermal expansion and excellent crystallization resistance.

Means for Solving the Problem

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows. (1) Optical glass containing the following components by weight percentage: P2O5: 10 to 30%, Bi2O3: 16 to 35%, Nb2O5: 20 to 40%, WO3: 5 to 20%, and among them, Bi2O3 / Nb2O5 is 0.5 to 1.5.

[0007] (2) The optical glass according to (1), further containing the following components by weight percentage: TiO2: 0 to 10%, and / or B2O3: 0 to 8%, and / or Li2O: 0 to 10%, and / or Na2O: 0 to 10%, and / or K2O: 0 to 10%, and / or RO: 0 to 10%, and / or SiO2: 0 to 5%, and / or ZrO2: 0 to 5%, and / or Al2O3: 0 to 5%, and / or Ln2O3: 0 to 8%, and / or GeO2: 0 to 5%, and / or fining agent: 0 to 1%, where the RO is one or more of MgO, CaO, SrO, BaO, ZnO, Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, Lu2O3, and the fining agent is one or more of Sb2O3, SnO2, SnO, CeO2.

[0008] (3) An optical glass containing components by weight percentage, with P2O5, Nb2O5, WO3, and Bi2O3 as essential components, Bi2O3 / Nb2O5 being 0.5 to 1.5, and the refractive index n d of the optical glass being 1.88 to 1.96, the Abbe number ν d being 25 or less, and the coefficient of thermal expansion α -30 / 70℃ being 100×10 -7 / K or less.

[0009] (4) Optical glass as described in (3), further comprising the following components by weight %,: P2O5: 10-30%, and / or Bi2O3: 16-35%, and / or Nb2O5: 20-40%, and / or WO3: 5-20%, and / or TiO2: 0-10%, and / or B2O3: 0-8%, and / or Li2O: 0-10%, and / or Na2O: 0-10%, and / or K2O: 0-10%, and / or RO: 0-10%, and / or SiO2: 0% 5%, and / or ZrO2: 0-5%, and / or Al2O3: 0-5%, and / or Ln2O3: 0-8%, and / or GeO2: 0-5%, and / or clarifying agent: 0-1%, wherein RO is one or more types of MgO, CaO, SrO, BaO, and ZnO, Ln2O3 is one or more types of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3, and the clarifying agent is one or more types of Sb2O3, SnO2, SnO, and CeO2.

[0010] (5) Optical glass according to any one of (1) to (4), containing the following components by weight %: Bi2O3 / Nb2O5 is 0.6 to 1.2, preferably Bi2O3 / Nb2O5 is 0.65 to 1.15, and more preferably Bi2O3 / Nb2O5 is 0.7 to 1.1.

[0011] (6) Optical glass according to any one of (1) to (4), containing the following components by weight %: (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.4 to 1.5, preferably (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.6 to 1.2, more preferably (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.72 to 1.0, and even more preferably (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.75 to 0.92.

[0012] (7) Optical glass according to any one of (1) to (4), containing the following components by weight %: (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.4 to 1.5, preferably (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.5 to 1.2, more preferably (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.6 to 1.0, and even more preferably (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.7 to 1.0.

[0013] (8) Optical glass according to any one of (1) to (4), containing the following components by weight %: WO3 / Bi2O3 is 0.2 to 1.0, preferably WO3 / Bi2O3 is 0.25 to 0.8, more preferably WO3 / Bi2O3 is 0.3 to 0.6, and even more preferably WO3 / Bi2O3 is 0.35 to 0.46.

[0014] (9) Optical glass according to any one of (1) to (4), containing the following components by weight %: P2O5 / (Nb2O5+TiO2) is 0.3 to 1.2, preferably P2O5 / (Nb2O5+TiO2) is 0.4 to 1.0, more preferably P2O5 / (Nb2O5+TiO2) is 0.45 to 0.9, and even more preferably P2O5 / (Nb2O5+TiO2) is 0.5 to 0.8.

[0015] (10) Optical glass according to any one of (1) to (4), containing the following components by weight %: (Li2O+Na2O+K2O) / Bi2O3 is 0.05 to 1.0, preferably (Li2O+Na2O+K2O) / Bi2O3 is 0.1 to 0.8, more preferably (Li2O+Na2O+K2O) / Bi2O3 is 0.15 to 0.6, and even more preferably (Li2O+Na2O+K2O) / Bi2O3 is 0.2 to 0.5.

[0016] (11) Optical glass according to any one of (1) to (4) containing the following components by weight %: TiO2 / (Li2O+Na2O+K2O) is 1.0 or less, preferably TiO2 / (Li2O+Na2O+K2O) is 0.02 to 0.8, more preferably TiO2 / (Li2O+Na2O+K2O) is 0.05 to 0.6, and even more preferably TiO2 / (Li2O+Na2O+K2O) is 0.1 to 0.38.

[0017] (12) Optical glass according to any one of (1) to (4), comprising the following components by weight %: RO / Li2O is 1.0 or less, preferably RO / Li2O is 0.7 or less, more preferably RO / Li2O is 0.5 or less, and even more preferably RO / Li2O is 0.4 or less.

[0018] (13) Optical glass according to any one of (1) to (4), containing the following components by weight %: (Na2O+TiO2) / WO3 is 0.1 to 2.0, preferably (Na2O+TiO2) / WO3 is 0.2 to 1.5, more preferably (Na2O+TiO2) / WO3 is 0.3 to 1.2, and even more preferably (Na2O+TiO2) / WO3 is 0.4 to 1.0.

[0019] (14) The optical glass according to any one of (1) to (4), containing the following components by weight %: P2O5: 15 to 25%, preferably P2O5: 17 to 23%, and / or Bi2O3: 18 to 32%, preferably Bi2O3: 22 to 29.5%, and / or Nb2O5: 25 to 35%, preferably Nb2O5: 27 to 33%, and / or WO3: 7 to 17%, preferably WO3: 9 to 15%, and / or TiO2: 0.5 to 8%, preferably TiO2: 1 to 5%, and / or B2O3: 0 to 5%, preferably B2O3: 0 to 3%, and / or Li2O: 0.5 to 8%, preferably Li2O: 1 to 5%, and / or Na2O: 1 to 8%, preferably Na2O: 2 to 7%, and / or K2O: 0 to 8%, preferably K2O: 0 to 5%, and / or RO: 0 to 8%, preferably RO: 0 to 4%, and / or SiO2: 0 to 3%, preferably SiO2: 0 to 2%, and / or ZrO2: 0 to 3%, preferably ZrO2: 0 to 2%, and / or Al2O3: 0 to 3%, preferably Al2O3: 0 to 2%, and / or Ln2O3: 0 to 5%, preferably Ln2O3: 0 to 3%, and / or GeO2: 0 to 3%, preferably GeO2: 0 to 2%, and / or fining agent: 0 to 0.5%, preferably fining agent: 0 to 0.2%; wherein RO is one or more of MgO, CaO, SrO, BaO, ZnO; Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, Lu2O3; and the fining agent is one or more of Sb2O3, SnO2, SnO, CeO2.

[0020] (15) Refractive index n d is 1.88 to 1.96, preferably 1.90 to 1.95, more preferably 1.91 to 1.94, and Abbe number ν d is 15 to 25, preferably 17 to 23, more preferably 18 to 22; the optical glass according to any one of (1) to (4).

[0021] (16) Acid resistance stability D A is Class 2 or above, preferably Class 1, and / or water resistance stability D W is Class 2 or above, preferably Class 1, and / or thermal expansion coefficient α -30 / 70℃ is 100×10 -7 / K or less, preferably 95 × 10 -7 / K or less, more preferably 90×10 -7 / K or less, and / or transition temperature T g The temperature is 500°C or lower, preferably 495°C or lower, more preferably 490°C or lower, even more preferably 485°C or lower, even more preferably 480°C or lower, and / or wear degree F A is 310-400, preferably 320-380, more preferably 340-370, and / or λ 70 The wavelength is 480 nm or less, preferably 475 nm or less, more preferably 470 nm or less, even more preferably 465 nm or less, and / or λ5 is 410 nm or less, preferably 405 nm or less, more preferably 400 nm or less, even more preferably 395 nm or less, and / or Young's modulus E is 8000 × 10⁻¹⁴ 7 / Pa or higher, preferably 8500 × 10 7 / Pa~10000×10 7 / Pa, more 8700×10 7 / Pa~9500×10 7 The pressure (Pa) and / or density ρ is 4.70 g / cm³. 3 Preferably, 4.60 g / cm³ 3 More preferably, 4.50 g / cm³ 3 The optical glass according to any one of (1) to (4), wherein the upper limit crystal temperature is 1000°C or less, preferably 980°C or less, more preferably 960°C or less, and even more preferably 950°C or less.

[0022] (17) A glass preform manufactured from any one of the optical glass described in (1) to (16). (18) An optical element manufactured from one of the optical glass described in (1) to (16) or the glass preform described in (17). (19) An optical instrument comprising an optical glass as described in one of (1) to (16) and / or an optical element as described in (18). [Effects of the Invention]

[0023] The beneficial effects of the present invention are as follows: Through rational component design, the optical glass obtained by the present invention can obtain the expected refractive index and Abbe number, while simultaneously having a relatively low coefficient of thermal expansion and excellent crystallinity resistance. [Modes for carrying out the invention]

[0024] The embodiments of the optical glass according to the present invention will be described in detail below, but the present invention is not limited to the embodiments described below and can be appropriately modified and implemented within the scope of the object of the present invention. Furthermore, although omissions may be made as appropriate, the gist of the present invention is not limited by repetition of the description. Hereinafter, the optical glass of the present invention may be simply referred to as glass.

[0025] [Optical glass] The following describes the range of components of the optical glass of the present invention. In this description, the content of each component and the total content shall be expressed in weight percentage (wt%) unless otherwise specified. That is, the content of each component and the total content shall be expressed as a weight percentage of the total weight of the glass material converted to an oxide composition. Here, "converted to an oxide composition" means that the total weight of oxide materials when the oxides, complex salts, hydroxides, etc. used as raw materials for the composition of the optical glass of the present invention decompose into oxides during melting is taken as 100%.

[0026] Specifically, the numerical ranges described herein include upper and lower limits, and “greater than or equal to” and “less than or equal to” include endpoint values, as well as all integers and fractions included in the range, and are not limited to the specific values ​​described where the range is limited. The term “about” as used herein means that the composition, parameters, other quantities, and characteristics are not, and do not need to be, precise and may be approximated and / or greater or less as necessary, reflecting tolerances, conversion factors, measurement errors, etc. What is referred to herein as “and / or” is inclusive; for example, “A and / or B” means A only, B only, or both A and B.

[0027] <Essential and Optional Ingredients> P2O5 acts as a glass-forming agent, lowering the melting temperature of the glass raw materials and increasing the stability and visible light transmittance of the glass. In this invention, to obtain the above effect, the glass contains 10% or more P2O5, preferably 15% or more, and more preferably 17% or more. Furthermore, by controlling the P2O5 content to 30% or less, a decrease in the refractive index and crystallinity of the glass is prevented. Therefore, in this invention, the P2O5 content is 30% or less, preferably 25% or less, and more preferably 23% or less. In some embodiments, it may contain approximately 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, and 30% P2O5.

[0028] Bi2O3 can increase the refractive index and partial dispersion ratio of glass, lower the softening temperature of glass, and improve the weather resistance and stability of glass. In this invention, to obtain the above effects, the glass contains 16% or more Bi2O3, preferably 18% or more, and more preferably 22% or more. Furthermore, by controlling the Bi2O3 content to 35% or less, even better glass crystallinity resistance and Young's modulus can be obtained. Therefore, the Bi2O3 content is 35% or less, preferably 32% or less, and more preferably 29.5% or less. In some embodiments, the mixture can contain approximately 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, and 35% Bi2O3.

[0029] Nb2O5 can increase the refractive index and dispersion of glass, while simultaneously improving the chemical stability and devitrification resistance of optical glass. In the present invention, to obtain the above effects, the glass contains 20% or more Nb2O5, preferably 25% or more, and more preferably 27% or more. If the Nb2O5 content exceeds 40%, the crystallinity resistance of the glass decreases, and the degree of abrasion worsens. Therefore, in the optical glass of the present invention, the Nb2O5 content is 40% or less, preferably 35% or less, and more preferably 33% or less. In some embodiments, the Nb2O5 can be included in amounts of approximately 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, and 40%.

[0030] In some embodiments, controlling the ratio of Bi2O3 content to Nb2O5 content, Bi2O3 / Nb2O5, to within 0.5 to 1.5 can improve the chemical stability of the glass while simultaneously lowering its thermal expansion coefficient. Therefore, Bi2O3 / Nb2O5 is preferably 0.5 to 1.5, and more preferably 0.6 to 1.2. Furthermore, controlling Bi2O3 / Nb2O5 to within 0.65 to 1.15 is advantageous for improving the crystallinity resistance of the glass and optimizing the degree of wear. Therefore, Bi2O3 / Nb2O5 is more preferably 0.65 to 1.15, and even more preferably 0.7 to 1.1. In some embodiments, the Bi2O3 / Nb2O5 values ​​can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5.

[0031] WO3 increases the refractive index and mechanical strength of glass, lowers the transition temperature of glass, and in precision press working, WO3 can suppress wettability between the glass material and the mold, thereby improving the release properties of the glass. In this invention, to obtain the above effects, the material contains 5% or more WO3, preferably with a lower limit of 7% WO3 content, and more preferably with a lower limit of 9% WO3 content. If the WO3 content exceeds 20%, the thermal stability of the glass decreases, making it easier to color during precision press working, the high-temperature viscosity of the glass decreases, and the difficulty of molding increases. Therefore, the upper limit of the WO3 content is 20%, preferably 17%, and more preferably 15%. In some embodiments, WO3 can be included in amounts of approximately 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, and 20%.

[0032] In some embodiments, the crystallinity resistance and stripe pattern of the glass can be improved by controlling the ratio of WO3 content to Bi2O3 content, WO3 / Bi2O3, to within 0.2 to 1.0. Therefore, preferably, WO3 / Bi2O3 is 0.2 to 1.0, more preferably 0.25 to 0.8, and even more preferably 0.3 to 0.6. Furthermore, controlling WO3 / Bi2O3 to within 0.35 to 0.46 can further reduce the transition temperature and thermal expansion coefficient of the glass. Therefore, even more preferably, WO3 / Bi2O3 is 0.35 to 0.46. In some embodiments, the value of WO3 / Bi2O3 can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1.0.

[0033] In some embodiments, the chemical stability of the glass can be improved while simultaneously improving its light transmittance by controlling the ratio (WO3+Bi2O3) / (Nb2O5+P2O5) between the total content of WO3 and Bi2O3 and the total content of Nb2O5 and P2O5 to within 0.4 to 1.5. Therefore, it is preferable that (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.4 to 1.5, and more preferably (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.5 to 1.2. Furthermore, by controlling (WO3+Bi2O3) / (Nb2O5+P2O5) to within 0.6 to 1.0, the refractive index temperature coefficient and thermal expansion coefficient of the glass can also be reduced. Therefore, it is more preferable that (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.6 to 1.0, and even more preferable that (WO3+Bi2O3) / (Nb2O5+P2O5) is 0.7 to 1.0. In some embodiments, the value of (WO3+Bi2O3) / (Nb2O5+P2O5) can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.85, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, or 1.5.

[0034] TiO2 enhances the refractive index and dispersion of glass, and by adding an appropriate amount, it is possible to obtain a suitable Young's modulus and prevent an increase in the thermal expansion coefficient of the glass. If the TiO2 content is too high, the abrasion resistance, transmittance, and chemical stability of the glass will deteriorate. Therefore, in this invention, the TiO2 content is 10% or less, preferably 0.5 to 8%, and more preferably 1 to 5%. In some embodiments, TiO2 can be included in amounts of approximately 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0035] In some embodiments, the chemical stability of the glass can be optimized and the transition temperature of the glass can be lowered by controlling the ratio (Nb2O5+TiO2) / (WO3+Bi2O3) of the total content of Nb2O5 and TiO2 to the total content of WO3 and Bi2O3 to within 0.4 to 1.5. Therefore, (Nb2O5+TiO2) / (WO3+Bi2O3) is preferably 0.4 to 1.5, and more preferably 0.6 to 1.2. Furthermore, the Young's modulus and density of the glass can be optimized by controlling (Nb2O5+TiO2) / (WO3+Bi2O3) to within 0.72 to 1.0. Therefore, it is more preferable that (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.72 to 1.0, and even more preferable that (Nb2O5+TiO2) / (WO3+Bi2O3) is 0.75 to 0.92. In some embodiments, the value of (Nb2O5+TiO2) / (WO3+Bi2O3) can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.85, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, or 1.5.

[0036] In some embodiments, controlling the ratio of P2O5 content to the total content of Nb2O5 and TiO2, P2O5 / (Nb2O5+TiO2), to within 0.3 to 1.2 can reduce the thermal expansion coefficient of the glass while simultaneously increasing its light transmittance. Therefore, it is preferable that P2O5 / (Nb2O5+TiO2) be 0.3 to 1.2, and more preferably 0.4 to 1.0. Furthermore, controlling P2O5 / (Nb2O5+TiO2) to within 0.45 to 0.9 can further optimize the abrasion and stripe pattern of the glass. Therefore, it is even more preferable that P2O5 / (Nb2O5+TiO2) be 0.45 to 0.9, and even more preferably 0.5 to 0.8. In some embodiments, the value of P2O5 / (Nb2O5+TiO2) can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, or 1.2.

[0037] B2O3 can enhance the meltability and devitrification resistance of glass and is an optional component of the glass of the present invention. By limiting the B2O3 content to 8% or less, it is possible to prevent a decrease in glass stability and refractive index due to excessive B2O3 content. Therefore, the B2O3 content is 8% or less, preferably 5% or less, and more preferably 3% or less. In some embodiments, the B2O3 can be included in amounts of approximately 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, and 8%.

[0038] Li2O can lower the transition temperature of glass and adjust its viscosity, but a high content is detrimental to the chemical stability and thermal expansion coefficient of the glass. Therefore, the Li2O content in this invention is 10% or less, preferably 0.5 to 8%, and more preferably 1 to 5%. In some embodiments, the Li2O can be included in amounts of approximately 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0039] Na2O can improve the meltability of glass, enhance the melting effect of glass, and lower the transition temperature of glass. However, if the Na2O content exceeds 10%, the chemical stability and weather resistance of the glass will decrease. Therefore, the Na2O content is 0-10%, preferably 1-8%, and more preferably 2-7%. In some embodiments, Na2O can be included in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0040] In some embodiments, by controlling the ratio of the total content of Na2O and TiO2 (Na2O+TiO2) to the content of WO3 ((Na2O+TiO2) / WO3) to within 0.1 to 2.0, it is possible to obtain glass with a relatively low coefficient of thermal expansion while simultaneously increasing the Young's modulus of the glass. Therefore, it is preferable that (Na2O+TiO2) / WO3 is 0.1 to 2.0, and more preferably that (Na2O+TiO2) / WO3 is 0.2 to 1.5. Furthermore, by controlling (Na2O+TiO2) / WO3 to within 0.3 to 1.2, the hardness and transition temperature of the glass can be optimized. Therefore, it is even more preferable that (Na2O+TiO2) / WO3 is 0.3 to 1.2, and even more preferably that (Na2O+TiO2) / WO3 is 0.4 to 1.0. In some embodiments, the value of (Na2O+TiO2) / WO3 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, or 2.0.

[0041] K2O has the effect of improving the thermal stability and meltability of glass, but if its content exceeds 10%, the devitrification resistance and chemical stability of the glass deteriorate. Therefore, the K2O content in this invention is 10% or less, preferably 8% or less, and more preferably 5% or less. In some embodiments, K2O can be included in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0042] In some embodiments, controlling the ratio of the total content of Li2O, Na2O, and K2O (Li2O+Na2O+K2O) to the content of Bi2O3 ((Li2O+Na2O+K2O) / Bi2O3) to within 0.05 to 1.0 prevents a decrease in the light transmittance of the glass while simultaneously improving its crystallinity. Therefore, (Li2O+Na2O+K2O) / Bi2O3 is preferably 0.05 to 1.0, and more preferably 0.1 to 0.8. Furthermore, controlling (Li2O+Na2O+K2O) / Bi2O3 to within 0.15 to 0.6 further optimizes the degree of bubble formation and wear of the glass. Therefore, (Li2O+Na2O+K2O) / Bi2O3 is more preferably 0.15 to 0.6, and even more preferably 0.2 to 0.5. In some embodiments, the value of (Li2O+Na2O+K2O) / Bi2O3 can be 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1.0.

[0043] In some embodiments, controlling the ratio of TiO2 content to the total content of Li2O, Na2O, and K2O, TiO2 / (Li2O+Na2O+K2O), to 1.0 or less is advantageous for reducing the density of the glass and optimizing the glass stripe and transmittance. Therefore, preferably TiO2 / (Li2O+Na2O+K2O) is 1.0 or less, more preferably TiO2 / (Li2O+Na2O+K2O) is 0.02 to 0.8, and even more preferably TiO2 / (Li2O+Na2O+K2O) is 0.05 to 0.6. Furthermore, controlling TiO2 / (Li2O+Na2O+K2O) to within 0.1 to 0.38 can optimize the Young's modulus and abrasion of the glass. Therefore, even more preferably TiO2 / (Li2O+Na2O+K2O) is 0.1 to 0.38. In some embodiments, the value of TiO2 / (Li2O+Na2O+K2O) is 0, ≥0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26 Possible values ​​include 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, and 1.0.

[0044] RO (where RO is one or more of MgO, CaO, SrO, BaO, and ZnO) can adjust the refractive index of the glass and improve its devitrification resistance, and is an optional component in the optical glass of the present invention. By controlling the RO content to 10% or less, a decrease in the crystallinity resistance and chemical stability of the glass can be suppressed. Therefore, in the optical glass of the present invention, the upper limit of the RO content range is 10%, preferably 8%, and more preferably 4%. In some embodiments, RO can include approximately 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 14%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0045] In some embodiments, controlling the ratio of RO content to Li2O content, RO / Li2O, to 1.0 or less is advantageous for improving the chemical and thermal stability of the glass. Therefore, RO / Li2O is preferably 1.0 or less, and more preferably 0.7 or less. Furthermore, controlling RO / Li2O to 0.5 or less can further optimize the crystallinity resistance and Young's modulus of the glass. Therefore, RO / Li2O is even more preferably 0.5 or less, and even more preferably 0.4 or less. In some embodiments, the RO / Li2O value is 0, 0 or greater, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, Possible values ​​include 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, and 1.0.

[0046] Ln2O3 (Ln2O3 is one or more of La2O3, Gd2O3, Y2O3, Yb2O3, and Lu2O3) is a component that enhances the refractive index and chemical stability of glass. By controlling the Ln2O3 content to 8% or less, a decrease in the devitrification resistance of glass can be prevented, and preferably the upper limit of the Ln2O3 content range is 5%, more preferably 3%. In some embodiments, Ln2O3 can be included in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, and 8%.

[0047] SiO2 can enhance the devitrification resistance and chemical stability of glass and is an optional component of the glass of the present invention. If its content is too high, the transition temperature of the glass will rise, the refractive index will decrease, and lithogenesis will be more likely. Therefore, in the present invention, the SiO2 content is 5% or less, preferably 3% or less, and more preferably 2% or less. In some embodiments, SiO2 can be included in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5%.

[0048] ZrO2 can increase the refractive index of glass, adjust dispersion, and improve the crystallinity and strength of the glass. However, if the ZrO2 content is too high, the difficulty of melting the glass increases and the transition temperature rises. Therefore, the ZrO2 content is 5% or less, preferably 3% or less, and more preferably 2% or less. In some embodiments, ZrO2 can be included in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5%.

[0049] Al2O3 can improve the chemical stability of glass, but if its content is too high, the devitrification resistance and meltability of the glass will decrease. Therefore, its content should be 5% or less, preferably 3% or less, more preferably 2% or less, and even more preferably Al2O3 should not be present. In some embodiments, the Al2O3 content may be 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0050] GeO2 has the effect of increasing the refractive index of glass and improving devitrification resistance, and is an optional component of the optical glass of the present invention. However, it is expensive, and including a large amount is detrimental to cost reduction and reduces the light transmittance of the glass. Therefore, its content is limited to 5% or less, preferably 3% or less, and more preferably 2% or less. In some embodiments, it is even more preferable not to include GeO2. In some embodiments, it may contain GeO2 in amounts of about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, and 5%.

[0051] In some embodiments, 0-1% of a clarifying agent may be added to the optical glass of the present invention to enhance the degassing ability of the glass. This clarifying agent is one or more of Sb2O3, SnO2, SnO, and CeO2, and preferably Sb2O3 is used as the clarifying agent. When the clarifying agent is used alone or in combination, the upper limit of its content is preferably 0.5%, more preferably 0.2%. In some embodiments, the content of one or more of the clarifying agents is about 0%, 0% or more, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, and 1%.

[0052] <Ingredients that should not be included> 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 included in small amounts, either individually or in combination, the glass becomes colored, certain wavelengths in the visible light region are absorbed, and the visible light transmission effect of the present invention is weakened. Therefore, it is preferable that optical glass that particularly requires wavelength transmittance in the visible light region does not actually contain such oxides.

[0053] In recent years, there has been a trend to control the use of oxides of Th, Cd, Tl, Os, Be, and Se as hazardous chemical substances, and environmental protection efforts are necessary not only in the glass manufacturing process but also in the processing process and the treatment of the finished product. Therefore, when prioritizing environmental impact, it is preferable to exclude these substances except for unavoidable inclusions. As a result, the optical glass will not actually contain substances that pollute the environment. Consequently, the optical glass of the present invention can be manufactured, processed, and disposed of without taking special environmental measures. Furthermore, in consideration of the environment, it is preferable that the optical glass of the present invention does not contain As2O3 and PbO.

[0054] The terms “not added,” “not contained,” and “0%” as used herein mean that this component was not intentionally added as a raw material for the glass of the present invention. However, small or trace amounts of impurities or components that were not intentionally added as raw materials and / or equipment for manufacturing the glass may be present in the final glass, and these are also covered by the patent of the present invention.

[0055] The performance of the optical glass of the present invention will be described below. <Refractive Index and Abbe Number> Refractive index of optical glass (n d ) and Abbe number (ν d ) has been tested according to the method specified in "GB / T 7962.1-2010". In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit of ) is 1.96, preferably 1.95, and more preferably 1.94. In some embodiments, the refractive index (n) of the optical glass of the present invention is determined by the present invention. d The lower limit of ) is 1.88, preferably 1.90, and more preferably 1.91. In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit of ) is 25, preferably 23, and more preferably 22. In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit of ) is 15, preferably 17, more preferably 18, and even more preferably 19.

[0056] <Coloring degree> The short-wave transmission spectral characteristics of the optical glass of the present invention are determined by the degree of coloration (λ 70 And it is represented by λ5). 70 This refers to the wavelength corresponding to when the glass transmittance reaches 70%. 70 The measurement is performed using a glass with a thickness of 10 ± 0.1 mm, having two parallel and optically polished relative planes, and measuring the spectral transmittance in the wavelength range from 280 nm to 700 nm. The wavelength at which the transmittance reaches 70% is indicated. Spectral transmittance or transmittance is defined as the amount of light applied perpendicular to the surface of the glass at intensity I in When light is incident and passes through the glass, the intensity is I out This is a quantity expressed as Iout / Iin when light is emitted from a single plane, and it also includes the transmittance of surface reflection loss at the glass surface. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in high refractive index glass, λ 70 A smaller value indicates that the glass itself has very little coloration and therefore a high light transmittance.

[0057] In some embodiments, the λ of the optical glass of the present invention 70 The wavelength is 480 nm or less, preferably 475 nm or less, more preferably 470 nm or less, even more preferably 465 nm or less, and even more preferably 460 nm or less. In some embodiments, the λ5 of the optical glass of the present invention is 410 nm or less, preferably 405 nm or less, more preferably 400 nm or less, and even more preferably 395 nm or less.

[0058] <Acid resistance stability> Acid resistance stability of optical glass (D A The (powder method) is tested according to the method specified in "GB / T 17129". In some embodiments, the acid resistance stability of the optical glass of the present invention (D A ) consists of two or more classes, preferably one class.

[0059] <Water resistance stability> Water resistance stability of optical glass (D W The (powder method) is tested according to the method specified in "GB / T 17129". In some embodiments, the water resistance stability of the optical glass of the present invention (D W ) consists of two or more classes, preferably one class.

[0060] <Crystal upper limit temperature> The crystallinity resistance of optical glass is measured using the temperature gradient furnace method. A 180 × 10 × 10 mm sample of glass is prepared, its sides are polished, and it is kept warm for 4 hours in a furnace with a temperature gradient (10°C / cm) where the highest temperature region is 1200°C. After that, it is removed and allowed to cool naturally to room temperature. The crystalline state of the glass is observed under a microscope, and the highest temperature at which crystals are confirmed is defined as the upper limit temperature of the glass crystallinity. In some embodiments, the upper limit temperature for crystal precipitation of the optical glass of the present invention is 1000°C or less, preferably 980°C or less, more preferably 960°C or less, and even more preferably 950°C or less.

[0061] Young's modulus The Young's modulus (E) of optical glass is calculated by measuring the longitudinal and transverse wave velocities using ultrasound and following the formula below.

number

[0062] In some embodiments, the Young's modulus (E) of the optical glass of the present invention is 8000 × 10⁻¹⁰. 7 / Pa or higher, preferably 8500 × 10 7 / Pa~10000×10 7 / Pa, more 8700×10 7 / Pa~9500×10 7 It is / Pa.

[0063] <Thermal expansion coefficient> The coefficient of thermal expansion of optical glass (α -30 / 70℃ ) The data for -30 to 70°C is measured according to the method described in "GB / T 7962.16-2010". The thermal expansion coefficient (α) of the optical glass of the present invention -30 / 70℃ ) is 100 x 10 -7 / K or less, preferably 95 × 10 -7 / K or less, more preferably 90×10 -7 It is less than or equal to / K.

[0064] <density> The density (ρ) of optical glass is tested according to the method specified in "GB / T7962.20-2010". In some embodiments, the density (ρ) of the optical glass of the present invention is 4.70 g / cm³. 3 Preferably, 4.60 g / cm³ 3 More preferably, 4.50 g / cm³ 3 The following applies:

[0065] <Abrasion level> Degree of wear of optical glass (F AThis value is obtained by multiplying the ratio of the wear amount of the sample to the wear amount (volume) of the standard sample (H-K9 glass) by 100 under exactly the same conditions, and the formula is as follows: F A =V / V0×100=(W / ρ) / (W0 / ρ0)×100 Here, V represents the volumetric wear of the sample being measured; V0 - Volumetric wear of a standard sample; W - Mass wear amount of the sample to be measured; W0 - Quality wear amount of standard sample; ρ - density of the sample being measured; ρ0 - Density of the standard sample. In some embodiments, the degree of wear (F) of the optical glass of the present invention A The upper limit is 400, preferably 380, and more preferably 370. In some embodiments, the degree of wear (F) of the optical glass of the present invention A The lower limit of ) is 310, preferably 320, and more preferably 340.

[0066] <Transition Temperature> Transition temperature of optical glass (T g ) is measured according to the method specified in "GB / T 7962.16-2010". In some embodiments, the transition temperature (T) of the optical glass of the present invention is determined to be the same as that of the optical glass of the present invention. g The temperature is 500°C or lower, preferably 495°C or lower, more preferably 490°C or lower, even more preferably 485°C or lower, and even more preferably 480°C or lower.

[0067] [Manufacturing method] The method for manufacturing the optical glass of the present invention is as follows: The glass of the present invention is manufactured using conventional raw materials and processes, including but not limited to oxides, hydroxides, fluorides, and various salts (carbonates, nitrates, sulfates, phosphates, metaphosphates), and after compounding by conventional methods, the prepared furnace material is placed in a melting furnace (such as a crucible of platinum, gold, or platinum alloy) at 800 to 1200°C and melted. Subsequently, it is clarified and homogenized to obtain a homogeneous molten glass free from bubbles and undissolved material, and this molten glass is then placed in a mold for casting and annealed. Those skilled in the art can appropriately select the raw materials, manufacturing method, and process parameters as needed.

[0068] [Glass preforms and optical elements] Glass preforms can be manufactured from optical glass produced using direct drop molding, polishing, or press molding methods such as hot press molding. Specifically, molten optical glass can be manufactured into a precise glass preform by direct precision drop molding, or by mechanical processing such as grinding or polishing. Alternatively, a preform blank for press molding can be created using optical glass, and this preform blank can be hot-pressed and polished to produce a glass preform. It should be noted that the means of manufacturing optical preforms are not limited to those described above.

[0069] As described above, the optical glass of the present invention is useful for various optical elements and optical designs. In particular, it is preferable to form a blank from the optical glass of the present invention and use this blank to manufacture optical elements such as lenses and prisms by performing hot press molding, precision press molding, etc.

[0070] Both the optical preform and the optical element of the present invention are formed from the optical glass of the present invention. The optical preform of the present invention has the excellent properties of optical glass, and the optical element of the present invention has the excellent properties of optical glass, making it possible to provide various optical elements such as lenses and prisms with high optical value.

[0071] Examples of lenses include various types of lenses with spherical or aspherical lens surfaces, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0072] [Optical equipment] Optical elements formed from the optical glass of the present invention can be used to manufacture optical devices such as photographic devices, imaging devices, projection devices, display devices, in-vehicle devices, and monitoring devices. [Examples]

[0073] <Examples of optical glass applications> To further clarify the technical solutions of the present invention, the following non-limiting embodiments are provided. This embodiment uses the optical glass manufacturing method described above to obtain optical glass having the compositions shown in Tables 1 to 4. Furthermore, the properties of each glass were measured using the test method described in the present invention, and the results are shown in Tables 1 to 4.

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] [Table 4]

[0078] <Examples of glass preforms> The glass obtained in Examples 1 to 26 of the optical glass is used to manufacture various lenses and preforms such as prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, using polishing or press forming methods such as reheat press forming or precision press forming.

[0079] <Examples of optical elements> The preform obtained in the above example of optical preform is tempered, and the refractive index is finely adjusted while reducing internal strain in the glass so that the optical properties such as the refractive index reach the desired value. Next, each preform is ground and polished to produce various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. An anti-reflective coating can also be applied to the surface of the resulting optical elements.

[0080] <Examples of optical instruments> The optical elements manufactured in the above-described embodiment can be used in imaging devices, sensors, microscopes, pharmaceutical technology, digital projection, communications, optical communications 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, or imaging equipment and devices in the automotive field, by forming optical components or optical parts using one or more optical elements through optical design.

Claims

1. Optical glass containing the following components by weight percentage and meeting the following conditions. P ２ O ５ :10~30%, Bi ２ O ３ :16-35%, Nb ２ O ５ : 20-40%, and WO ３ : 5-20%. Bi ２ O ３ / Nb ２ O ５ (weight ratio) is 0.5 to 1.5, TiO ２ / (Li ２ O + Na ２ O + K ２ O)(weight ratio) is 0.38 or less, WO ３ / Bi ２ O ３ (weight ratio) is 0.2 to 0.46, and the refractive index nd is 1.91 to 1.

96.

2. The optical glass according to claim 1, further comprising, in weight percent, one or more components selected from the following groups. TiO ２ : 0-10%, B ２ O ３ : 0-8%, Li ２ O: 0-10%, Na ２ O: 0-10%, K ２ O: 0-10%, RO: 0-10%, SiO ２ : 0-5%, ZrO ２ : 0-5%, Al ２ O ３ : 0-5%, Ln ２ O ３ : 0-8%, Geo ２ A group consisting of 0-5% of the active ingredient and 0-1% of the clarifying agent. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO, and Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ , and Lu ２ O ３ The clarifying agent is one or more selected from the group consisting of Sb ２ O ３ , SnO ２ , SnO, and CeO ２ It is one or more species selected from the group consisting of the following.

3. P is an essential component. ２ O ５ , Nb ２ O ５ WO ３ and Bi ２ O ３ Including Bi ２ O ３ / Nb ２ O ５ (Weight ratio) is 0.5 to 1.5, TiO ２ / (Li ２ O + Na ２ O+K ２ O) (weight ratio) is 0.38 or less, WO ３ / Bi ２ O ３ The (weight ratio) is 0.2 to 0.46, and the refractive index n ｄ The range is 1.91 to 1.96, and the Abbe number is ν. ｄ The coefficient of thermal expansion α is 25 or less. －３０／７０℃ 100 x 10 －７ Optical glass with a temperature of / K or less.

4. The optical glass according to claim 3, further comprising, in weight percent, one or more components selected from the following groups. P ２ O ５ :10~30%, Bi ２ O ３ :16-35%, Nb ２ O ５ :20-40%, WO ３ :5~20%, TiO ２ : 0-10%, B ２ O ３ : 0-8%, Li ２ O: 0-10%, Na ２ O: 0-10%, K ２ O: 0-10%, RO: 0-10%, SiO ２ : 0-5%, ZrO ２ : 0-5%, Al ２ O ３ : 0-5%, Ln ２ O ３ : 0-8%, Geo ２ A group consisting of 0-5% of the active ingredient and 0-1% of the clarifying agent. Here, the RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO, and Ln ２ O ３ is La ２ O ３ , Gd ２ O ３ , Y ２ O ３ , Yb ２ O ３ and Lu ２ O ３ selected from the group consisting of one or more, and the fining agent is Sb ２ O ３ , SnO ２ , SnO, and CeO ２ selected from the group consisting of one or more of.

5. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following seven conditions. 1) Bi ２ O ３ / Nb ２ O ５ (By weight ratio) is 0.6 to 1.2; 2) (Nb ２ O ５ +TiO ２ ) / (WO ３ +Bi ２ O ３ (By weight ratio) is 0.4 to 1.5; 3) (WO ３ +Bi ２ O ３ ) / (Nb ２ O ５ +P ２ O ５ (By weight ratio) is 0.4 to 1.5; 4) P ２ O ５ / (Nb ２ O ５ +TiO ２ The weight ratio is 0.3 to 1.2; 5) (Li ２ O + Na ２ O + K ２ O) / Bi ２ O ３ (by weight) is 0.05 to 1.0; 6)RO / Li ２ O (weight ratio) is 1.0 or less; 7) (Na ２ O+TiO ２ ) / WO ３ The weight ratio is 0.1 to 2.

0. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO.

6. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following nine conditions. 1) Bi ２ O ３ / Nb ２ O ５ (By weight ratio) is 0.65 to 1.15; 2) (Nb ２ O ５ +TiO ２ ) / (WO ３ +Bi ２ O ３ The weight ratio is 0.6 to 1.2; 3) (WO ３ +Bi ２ O ３ ) / (Nb ２ O ５ +P ２ O ５ (By weight ratio) is 0.5 to 1.2; 4) WO ３ / Bi ２ O ３ (By weight ratio) is 0.25–0.46; 5) P ２ O ５ / (Nb ２ O ５ +TiO ２ (By weight ratio) is 0.4 to 1.0; 6) (Li ２ O + Na ２ O + K ２ O) / Bi ２ O ３ (weight ratio) is 0.1 to 0.8; 7) TiO ２ / (Li ２ O + Na ２ O+K ２ O) (weight ratio) is 0.02 to 0.38; 8)RO / Li ２ O (weight ratio) is 0.7 or less; 9) (Na ２ O+TiO ２ ) / WO ３ The weight ratio is 0.2 to 1.

5. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO.

7. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following nine conditions. 1) Bi ２ O ３ / Nb ２ O ５ (By weight ratio) is 0.7 to 1.1; 2) (Nb ２ O ５ +TiO ２ ) / (WO ３ +Bi ２ O ３ (By weight) is 0.72 to 1.0; 3) (WO ３ +Bi ２ O ３ ) / (Nb ２ O ５ +P ２ O ５ (By weight ratio) is 0.6 to 1.0; 4) WO ３ / Bi ２ O ３ (By weight ratio) is 0.3 to 0.46; 5) P ２ O ５ / (Nb ２ O ５ +TiO ２ (By weight) is 0.45 to 0.9; 6)(Li ２ O + Na ２ O + K ２ O) / Bi ２ O ３ (weight ratio) is 0.15 to 0.6; 7) TiO ２ / (Li ２ O + Na ２ O+K ２ O) (weight ratio) is 0.05 to 0.38; 8)RO / Li ２ O (weight ratio) is 0.5 or less; 9) (Na ２ O+TiO ２ ) / WO ３ The weight ratio is 0.3 to 1.

2. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO.

8. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following eight conditions. 1) (Nb ２ O ５ +TiO ２ ) / (WO ３ +Bi ２ O ３ (By weight) is 0.75-0.92; 2) (WO ３ +Bi ２ O ３ ) / (Nb ２ O ５ +P ２ O ５ (By weight ratio) is 0.7 to 1.0; 3) WO ３ / Bi ２ O ３ (By weight ratio) is 0.35–0.46; 4) P ２ O ５ / (Nb ２ O ５ +TiO ２ The weight ratio is 0.5 to 0.8; 5) (Li ２ O + Na ２ O + K ２ O) / Bi ２ O ３ (weight ratio) is 0.2 to 0.5; 6) TiO ２ / (Li ２ O + Na ２ O+K ２ O) (weight ratio) is 0.1 to 0.38; 7)RO / Li ２ O (weight ratio) is 0.4 or less; 8) (Na ２ O+TiO ２ ) / WO ３ The weight ratio is 0.4 to 1.

0. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO.

9. The optical glass according to any one of claims 1 to 4, comprising, by weight, one or more components selected from the following groups. P ２ O ５ :15~25%, Bi ２ O ３ :18-32%, Nb ２ O ５ :25-35%, WO ３ :7~17%, TiO ２ : 0.5-8%, B ２ O ３ : 0-5%, Li ２ O: 0.5-8%, Na ２ O: 1-8%, K ２ O: 0-8%, RO: 0-8%, SiO ２ : 0-3%, ZrO ２ : 0-3%, Al ２ O ３ : 0-3%, Ln ２ O ３ : 0-5%, GeO ２ A group consisting of 0-3% of the active ingredient and 0-0.5% of the clarifying agent. Here, RO is one or more of MgO, CaO, SrO, BaO, and ZnO, and Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ , and Lu ２ O ３ The clarifying agent is one or more selected from the group consisting of Sb ２ O ３ , SnO ２ , SnO, and CeO ２ It is one or more species selected from the group consisting of the following.

10. The optical glass according to any one of claims 1 to 4, comprising, by weight, one or more components selected from the following groups. P ２ O ５ :17-23%, Bi ２ O ３ :22-29.5%, Nb ２ O ５ :27-33%, WO ３ :9~15%, TiO ２ : 1-5%, B ２ O ３ : 0-3%, Li ２ O: 1-5%, Na ２ O: 2-7%, K ２ O: 0-5%, RO: 0-4%, SiO ２ : 0-2%, ZrO ２ : 0-2%, Al ２ O ３ : 0-2%, Ln ２ O ３ : 0-3%, GeO ２ A group consisting of 0-2% of the active ingredient and 0-0.2% of the clarifying agent. Here, RO is one or more selected from the group consisting of MgO, CaO, SrO, BaO, and ZnO, and Ln ２ O ３ La ２ O ３ , Gd ２ O ３ , Y ２ O ３ Yb ２ O ３ , and Lu ２ O ３ The clarifying agent is one or more selected from the group consisting of Sb ２ O ３ , SnO ２ , SnO, and CeO ２ It is one or more species selected from the group consisting of the following.

11. The Abbe number ν of the optical glass ｄ The optical glass according to any one of claims 1 to 4, wherein the value is 15 to 25.

12. The refractive index n of the optical glass ｄ ν is 1.91-1.94, Abbe number ν ｄ The optical glass according to any one of claims 1 to 4, wherein the length is 18 to 22.

13. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following ten conditions. 1) Acid resistance stability D Ａ The number is 2 or higher. 2) Water resistance stability D Ｗ The number is 2 or higher. 3) Thermal expansion coefficient α －３０／７０℃ 100 x 10 －７ It is less than or equal to / K. 4) Transition temperature T ｇ The temperature is below 500°C. 5) Abrasion degree F Ａ The range is 310-400. 6) λ ７０ It is 480 nm or less. 7) λ ５ It is 410 nm or less. 8) Young's modulus E is 8000 × 10 ７ It is greater than or equal to / Pa. 9) Density ρ is 4.70 g / cm³ ３ The following applies: 10) The upper limit temperature at which crystallization can be maintained is 1000°C or less.

14. An optical glass according to any one of claims 1 to 4, which satisfies one or more of the following ten conditions. 1) Acid resistance stability D Ａ This is a Class 1. 2) Water resistance stability D Ｗ This is a Class 1. 3) Thermal expansion coefficient α －３０／７０℃ 90 x 10 －７ It is less than or equal to / K. 4) Transition temperature T ｇ The temperature is below 480°C. 5) Abrasion degree F Ａ The range is 340-370. 6) λ ７０ It is 460 nm or less. 7) λ ５ It is 395 nm or less. 8) Young's modulus E is 8700 × 10 ７ / Pa~9500×10 ７ It is / Pa. 9) Density ρ is 4.50 g / cm³ ３ The following applies: 10) The upper limit temperature at which crystallization can be maintained is 950°C or lower.

15. A glass preform manufactured from the optical glass described in any one of claims 1 to 4.

16. An optical element made from an optical glass according to any one of claims 1 to 4, or from a glass preform made of said optical glass.

17. An optical instrument comprising the optical glass described in any one of claims 1 to 4.

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