阅读说明：本技术 光学玻璃、玻璃预制件、光学元件和光学仪器 (Optical glass, glass preform, optical element and optical instrument ) 是由 匡波 于 2021-09-14 设计创作，主要内容包括：本发明提供一种光学玻璃,所述光学玻璃的组分以重量百分比表示,含有：P-(2)O-(5)：10～30％；Bi-(2)O-(3)：16～35％；Nb-(2)O-(5)：20～40％；WO-(3)：5～20％,其中Bi-(2)O-(3)/Nb-(2)O-(5)为0.5～1.5。通过合理的组分设计,本发明获得的光学玻璃在具有期望的折射率和阿贝数的同时,具有较低的热膨胀系数和优异的抗析晶性能。(The invention provides an optical glass, which comprises the following components in percentage by weight: p 2 O 5 ：10～30％；Bi 2 O 3 ：16～35％；Nb 2 O 5 ：20～40％；WO 3 : 5 to 20% of Bi 2 O 3 /Nb 2 O 5 0.5 to 1.5. Through reasonable component design, the optical glass obtained by the invention has a lower thermal expansion coefficient and excellent anti-devitrification performance while having a desired refractive index and Abbe number.)

1. Optical glass, characterized in that its components, expressed in weight percent, contain: p₂O₅：10～30％；Bi₂O₃：16～35％；Nb₂O₅：20～40％；WO₃: 5 to 20% of Bi₂O₃/Nb₂O₅0.5 to 1.5.

2. According toThe optical glass according to claim 1, wherein the composition, expressed in weight percent, further comprises: TiO 2₂: 0 to 10 percent; and/or B₂O₃: 0-8%; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or RO: 0 to 10 percent; and/or SiO₂: 0 to 5 percent; and/or ZrO₂: 0 to 5 percent; and/or Al₂O₃: 0 to 5 percent; and/or Ln₂O₃: 0-8%; and/or GeO₂: 0 to 5 percent; and/or a clarifying agent: 0-1%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

3. An optical glass characterized by containing P₂O₅、Nb₂O₅、WO₃And Bi₂O₃As an essential component, the component thereof is expressed in weight percent, wherein Bi₂O₃/Nb₂O₅0.5 to 1.5, the refractive index n of the optical glass_dIs 1.88 to 1.96, and has an Abbe number v_dA coefficient of thermal expansion of 25 or less_-30/70℃Is 100 x 10^-7and/K is less than or equal to.

4. An optical glass according to claim 3, characterised in that its composition, expressed in weight percentage, contains: p₂O₅: 10-30%; and/or Bi₂O₃: 16-35%; and/or Nb₂O₅: 20-40%; and/or WO₃: 5-20%; and/or TiO₂: 0 to 10 percent; and/or B₂O₃: 0-8%; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or RO: 0 to 10 percent; and/or SiO₂: 0 to 5 percent; and/or ZrO₂: 0 to 5 percent; and/or Al₂O₃: 0 to 5 percent; and/or Ln₂O₃: 0-8%; and/or GeO₂: 0 to 5 percent; and/or a clarifying agent: 0-1%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

5. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: bi₂O₃/Nb₂O₅0.6 to 1.2, preferably Bi₂O₃/Nb₂O₅0.65 to 1.15, and Bi is more preferable₂O₃/Nb₂O₅0.7 to 1.1.

6. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.4 to 1.5; preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.6 to 1.2, and more preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.72 to 1.0, and more preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.75 to 0.92.

7. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.4 to 1.5, preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.5 to 1.2, more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) Is 0.6 to 1.0, and is more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.7 to 1.0.

8. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: WO₃/Bi₂O₃0.2 to 1.0, preferably WO₃/Bi₂O₃0.25 to 0.8, more preferably WO₃/Bi₂O₃0.3 to 0.6, and further preferably WO₃/Bi₂O₃0.35 to 0.46.

9. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: p₂O₅/(Nb₂O₅+TiO₂) 0.3 to 1.2, preferably P₂O₅/(Nb₂O₅+TiO₂) 0.4 to 1.0, more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.45 to 0.9, and more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.5 to 0.8.

10. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.05 to 1.0, preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.1 to 0.8, more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.15 to 0.6, and more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.2 to 0.5.

11. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: TiO 2₂/(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 TiO is more preferable₂/(Li₂O+Na₂O+K₂O) is 0.1 to 0.38.

12. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: RO/Li₂O is 1.0 or less, preferably RO/Li₂O is 0.7 or less, and RO/Li is more preferable₂O is 0.5 or less, and RO/Li is more preferable₂O is 0.4 or less.

13. An optical glass according to any one of claims 1 to 4, characterised in that its components, expressed in weight percentage, are: (Na)₂O+TiO₂)/WO₃0.1 to 2.0, preferably (Na)₂O+TiO₂)/WO₃0.2 to 1.5, more preferably (Na)₂O+TiO₂)/WO₃0.3 to 1.2, and more preferably (Na)₂O+TiO₂)/WO₃0.4 to 1.0.

14. An optical glass according to any one of claims 1 to 4, comprising, in weight percent: p₂O₅: 15 to 25%, preferably P₂O₅: 17-23%; and/or Bi₂O₃: 18 to 32%, preferably Bi₂O₃: 22-29.5%; and/or Nb₂O₅: 25 to 35%, preferably Nb₂O₅: 27 to 33 percent; and/or WO₃: 7 to 17%, preferably WO₃: 9-15%; and/or TiO₂: 0.5-8%, preferably TiO₂: 1-5%; and/or B₂O₃: 0 to 5%, preferably B₂O₃: 0 to 3 percent; and/or Li₂O: 0.5 to 8%, preferably Li₂O: 1-5%; and/or Na₂O: 1 to 8%, preferably Na₂O: 2-7%; and/or K₂O: 0 to 8%, preferably K₂O: 0 to 5 percent; and/or RO: 0-8%, preferably RO: 0 to 4 percent; and/or SiO₂: 0 to 3%, preferably SiO₂: 0-2%; and/or ZrO₂: 0 to 3%, preferably ZrO₂: 0-2%; and/or Al₂O₃: 0 to 3%, preferably Al₂O₃: 0-2%; and/or Ln₂O₃: 0 to 5%, preferably Ln₂O₃: 0 to 3 percent; and/or GeO₂: 0 to 3%, preferably GeO₂: 0-2%; and/or a clarifying agent: 0-0.5%, preferably clarifying agent: 0-0.2%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

15. The optical glass according to any one of claims 1 to 4, wherein the refractive index n of the optical glass_d1.88 to 1.96, preferably 1.90 to 1.95, and more preferably 1.91 to 1.94; abbe number v_d15 to 25, preferably 17 to 23, and more preferably 18 to 22.

16. The optical glass according to any one of claims 1 to 4, wherein the optical glass has a stability to acid action D_AIs 2 or more, preferably 1; and/or stability against water action D_WIs 2 or more, preferably 1; and/or coefficient of thermal expansion alpha_-30/70℃Is 100 x 10^-7Preferably 95X 10 or less,/K^-7A value of less than or equal to K, more preferably 90X 10^-7below/K; and/or transition temperature T_gIs 500 ℃ or lower, preferably 495 ℃ or lower, more preferably 490 ℃ or lower, still more preferably oneThe step (C) is preferably 485 ℃ or lower, and more preferably 480 ℃ or lower; and/or degree of wear F_A310 to 400, preferably 320 to 380, more preferably 340 to 370; and/or lambda₇₀480nm or less, preferably 475nm or less, more preferably 470nm or less, further preferably 465nm or less, and further preferably 460nm or less; and/or lambda₅Is 410nm or less, preferably 405nm or less, more preferably 400nm or less, and further preferably 395nm or less; and/or a Young's modulus E of 8000X 10⁷/Pa or more, preferably 8500X 10⁷/Pa～10000×10⁷/Pa, more preferably 8700X 10⁷/Pa～9500×10⁷Pa; and/or a density rho of 4.70g/cm³Hereinafter, it is preferably 4.60g/cm³Hereinafter, more preferably 4.50g/cm³The following; and/or the upper limit crystallization temperature is 1000 ℃ or lower, preferably 980 ℃ or lower, more preferably 960 ℃ or lower, and still more preferably 950 ℃ or lower.

17. A glass preform characterized by being made of the optical glass according to any one of claims 1 to 16.

18. An optical element produced from the optical glass according to any one of claims 1 to 16 or the glass preform according to claim 17.

19. An optical device comprising the optical glass according to any one of claims 1 to 16 and/or comprising the optical element according to claim 18.

Technical Field

The invention relates to optical glass, in particular to optical glass with a refractive index of 1.88-1.96 and an Abbe number of less than 25, and a glass preform, an optical element and an optical instrument made of the optical glass.

Background

In recent years, with the development of fields such as photoelectric information and digital display, there has been a demand for downsizing, weight reduction, and high performance of optical elements used in optical systems. The high-refraction high-dispersion optical glass can be coupled with low-dispersion optical glass for use, so that chromatic aberration and secondary spectrum are effectively eliminated, the optical total length of a lens can be effectively shortened, and an imaging system is miniaturized, therefore, the glass has wide application prospect.

The larger the thermal expansion coefficient of the optical glass is, the poorer the thermal shock resistance of the glass is, and the more easily the glass is broken due to thermal expansion and cold contraction in the hot-pressing and cold-working processes, thereby reducing the yield of the glass. On the other hand, the optical glass with excellent anti-crystallization performance can reduce the process difficulty in the glass production and hot working processes. In the prior art, for example, there is room for further improvement in devitrification resistance of an optical glass having a refractive index of 1.91 to 1.96 and an abbe number of 17.5 to 21 disclosed in patent document CN101746953A and a high-refractive-index, high-dispersion optical glass disclosed in patent document CN 1332901C.

Disclosure of Invention

The invention aims to provide high-refraction high-dispersion optical glass with a lower thermal expansion coefficient and excellent anti-crystallization performance.

The technical scheme adopted by the invention for solving the technical problem is as follows:

(1) the optical glass comprises the following components in percentage by weight: p₂O₅：10～30％；Bi₂O₃：16～35％；Nb₂O₅：20～40％；WO₃: 5 to 20% of Bi₂O₃/Nb₂O₅0.5 to 1.5.

(2) The optical glass according to (1), which comprises the following components in percentage by weight: TiO 2₂: 0 to 10 percent; and/or B₂O₃: 0-8%; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or RO: 0 to 10 percent; and/or SiO₂: 0 to 5 percent; and/or ZrO₂: 0 to 5 percent; and/or Al₂O₃: 0 to 5 percent; and/or Ln₂O₃: 0-8%; and/or GeO₂: 0 to 5 percent; and/or a clarifying agent: 0-1%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

(3) Optical glass containing P₂O₅、Nb₂O₅、WO₃And Bi₂O₃As an essential component, the component thereof is expressed in weight percent, wherein Bi₂O₃/Nb₂O₅0.5 to 1.5, the refractive index n of the optical glass_dIs 1.88 to 1.96, and has an Abbe number v_dA coefficient of thermal expansion of 25 or less_-30/70℃Is 100 x 10^-7and/K is less than or equal to.

(4) The optical glass according to (3), which comprises the following components in percentage by weight: p₂O₅: 10-30%; and/or Bi₂O₃: 16-35%; and/or Nb₂O₅: 20-40%; and/or WO₃: 5-20%; and/or TiO₂: 0 to 10 percent; and/or B₂O₃: 0-8%; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or RO: 0 to 10 percent; and/or SiO₂: 0 to 5 percent; and/or ZrO₂: 0 to 5 percent; and/or Al₂O₃: 0 to 5 percent; and/or Ln₂O₃: 0-8%; and/or GeO₂: 0 to 5 percent; and/or a clarifying agent: 0-1%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

(5) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: bi₂O₃/Nb₂O₅0.6 to 1.2, preferably Bi₂O₃/Nb₂O₅0.65 to 1.15, and Bi is more preferable₂O₃/Nb₂O₅0.7 to 1.1.

(6) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.4 to 1.5; preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.6 to 1.2, preferablySelecting (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.72 to 1.0, and more preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.75 to 0.92.

(7) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.4 to 1.5, preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.5 to 1.2, more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) Is 0.6 to 1.0, and is more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.7 to 1.0.

(8) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: WO₃/Bi₂O₃0.2 to 1.0, preferably WO₃/Bi₂O₃0.25 to 0.8, more preferably WO₃/Bi₂O₃0.3 to 0.6, and further preferably WO₃/Bi₂O₃0.35 to 0.46.

(9) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: p₂O₅/(Nb₂O₅+TiO₂) 0.3 to 1.2, preferably P₂O₅/(Nb₂O₅+TiO₂) 0.4 to 1.0, more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.45 to 0.9, and more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.5 to 0.8.

(10) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.05 to 1.0, preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.1 to 0.8, more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.15 to 0.6, and more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.2 to 0.5.

(11) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: TiO 2₂/(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 TiO is more preferable₂/(Li₂O+Na₂O+K₂O) is 0.1 to 0.38.

(12) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: RO/Li₂O is 1.0 or less, preferably RO/Li₂O is 0.7 or less, and RO/Li is more preferable₂O is 0.5 or less, and RO/Li is more preferable₂O is 0.4 or less.

(13) The optical glass according to any one of (1) to (4), which comprises the following components in percentage by weight: (Na)₂O+TiO₂)/WO₃0.1 to 2.0, preferably (Na)₂O+TiO₂)/WO₃0.2 to 1.5, more preferably (Na)₂O+TiO₂)/WO₃0.3 to 1.2, and more preferably (Na)₂O+TiO₂)/WO₃0.4 to 1.0.

(14) The optical glass according to any one of (1) to (4), which comprises, in terms of weight percent: p₂O₅: 15 to 25%, preferably P₂O₅: 17-23%; and/or Bi₂O₃: 18 to 32%, preferably Bi₂O₃: 22-29.5%; and/or Nb₂O₅: 25 to 35%, preferably Nb₂O₅: 27 to 33 percent; and/or WO₃: 7 to 17%, preferably WO₃: 9-15%; and/or TiO₂: 0.5-8%, preferably TiO₂: 1-5%; and/or B₂O₃: 0 to 5%, preferably B₂O₃: 0 to 3 percent; and/or Li₂O: 0.5 to 8%, preferably Li₂O: 1-5%; and/or Na₂O: 1 to 8%, preferably Na₂O: 2-7%; and/or K₂O: 0 to 8%, preferably K₂O: 0 to 5 percent; and/or RO: 0-8%, preferably RO: 0 to 4 percent; and/or SiO₂: 0 to 3%, preferably SiO₂: 0-2%; and/or ZrO₂: 0 to 3%, preferably ZrO₂: 0-2%; and/or Al₂O₃: 0 to 3%, preferably Al₂O₃: 0-2%; and/or Ln₂O₃: 0 to 5%, preferably Ln₂O₃: 0 to 3 percent; and/or GeO₂: 0 to 3%, preferably GeO₂: 0-2%; and/or a clarifying agent: 0-0.5%, preferably clarifying agent: 0-0.2%, RO is one or more of MgO, CaO, SrO, BaO and ZnO, Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more of Sb as clarifying agent₂O₃、SnO₂、SnO、CeO₂One or more of (a).

(15) The optical glass according to any one of (1) to (4) above, having a refractive index n_d1.88 to 1.96, preferably 1.90 to 1.95, and more preferably 1.91 to 1.94; abbe number v_d15 to 25, preferably 17 to 23, and more preferably 18 to 22.

(16) Stability against acid Effect of the optical glass according to any one of (1) to (4) D_AIs 2 or more, preferably 1; and/or stability against water action D_WIs 2 or more, preferably 1; and/or coefficient of thermal expansion alpha_-30/70℃Is 100 x 10^-7Preferably 95X 10 or less,/K^-7A value of less than or equal to K, more preferably 90X 10^-7below/K; and/or transition temperature T_gIs 500 ℃ or lower, preferably 495 ℃ or lower, more preferably 490 ℃ or lower, still more preferably 485 ℃ or lower, and yet more preferably 480 ℃ or lower; and/or degree of wear F_A310 to 400, preferably 320 to 380, more preferably 340 to 370; and/or lambda₇₀Is preferably below 480nmIs preferably 475nm or less, more preferably 470nm or less, still more preferably 465nm or less, and still more preferably 460nm or less; and/or lambda₅Is 410nm or less, preferably 405nm or less, more preferably 400nm or less, and further preferably 395nm or less; and/or a Young's modulus E of 8000X 10⁷/Pa or more, preferably 8500X 10⁷/Pa～10000×10⁷/Pa, more preferably 8700X 10⁷/Pa～9500×10⁷Pa; and/or a density rho of 4.70g/cm³Hereinafter, it is preferably 4.60g/cm³Hereinafter, more preferably 4.50g/cm³The following; and/or the upper limit crystallization temperature is 1000 ℃ or lower, preferably 980 ℃ or lower, more preferably 960 ℃ or lower, and still more preferably 950 ℃ or lower.

(17) A glass preform made of the optical glass according to any one of (1) to (16).

(18) An optical element produced from the optical glass according to any one of (1) to (16) or the glass preform according to (17).

(19) An optical device comprising the optical glass according to any one of (1) to (16), and/or comprising the optical element according to (18).

The invention has the beneficial effects that: through reasonable component design, the optical glass obtained by the invention has a lower thermal expansion coefficient and excellent anti-devitrification performance while having a desired refractive index and Abbe number.

Detailed Description

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

[ optical glass ]

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

Unless otherwise indicated in a specific context, numerical ranges set forth herein include upper and lower values, and "above" and "below" include end-point values, as well as all integers and fractions within the range, and are not limited to the specific values recited in the defined range. The term "about" as used herein means that the formulations, parameters, and other quantities and characteristics are not, and need not be, exact, and can be approximate and/or larger or smaller, if desired, reflecting tolerances, conversion factors, measurement error and the like. As used herein, "and/or" is inclusive, e.g., "A and/or B," and means A alone, B alone, or both A and B.

< essential Components and optional Components >

P₂O₅The glass forming material has the functions of lowering the melting temperature of the glass raw material and improving the stability and visible light transmittance of the glass, and in the present invention, P is contained by 10% or more₂O₅To obtain the above effects, P is preferred₂O₅Is 15% or more, more preferably P₂O₅The content of (B) is more than 17%. On the other hand, P is₂O₅The content of (A) is controlled to be 30% or less to prevent the glass from lowering in refractive index and deterioration in devitrification resistance. Thus, P in the present invention₂O₅The content of (b) is 30% or less, preferably 25% or less, more preferably 23% or less. In some embodiments, about 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% may be included28%, 28.5%, 29%, 29.5%, 30% P₂O₅。

Bi₂O₃Can improve the refractive index and the partial dispersion ratio of the glass, reduce the softening temperature of the glass and improve the weather resistance and the stability of the glass. In the present invention, 16% or more of Bi is contained₂O₃In order to obtain the above-mentioned effects, Bi is preferably contained in an amount of 18% or more₂O₃More preferably 22% or more of Bi₂O₃. On the other hand, by adding Bi₂O₃The content of (A) is controlled to be less than 35%, so that the glass has excellent anti-devitrification performance and Young modulus. Thus, Bi₂O₃The content of (b) is 35% or less, preferably 32% or less, more preferably 29.5% or less. In some embodiments, about 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%, 35% Bi may be included₂O₃。

Nb₂O₅The refractive index and dispersion of the glass can be improved, and the chemical stability and devitrification resistance of the optical glass can be improved. In the invention, more than 20 percent of Nb is contained₂O₅In order to obtain the above effects, it is preferable to contain 25% or more of Nb₂O₅More preferably 27% or more of Nb₂O₅. If Nb₂O₅When the content exceeds 40%, the devitrification resistance of the glass is lowered and the abrasion degree is deteriorated. Therefore, in the optical glass of the present invention, Nb₂O₅The content is 40% or less, preferably 35% or less, and more preferably 33% or less. In some embodiments, about 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%, may be included% 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40% Nb₂O₅。

In some embodiments, by reacting Bi₂O₃Content of (2) and Nb₂O₅Ratio between contents of Bi₂O₃/Nb₂O₅The chemical stability of the glass can be improved and the thermal expansion coefficient of the glass can be reduced by controlling the temperature within the range of 0.5-1.5. Therefore, Bi is preferred₂O₃/Nb₂O₅0.5 to 1.5, and Bi is more preferable₂O₃/Nb₂O₅0.6 to 1.2. Further, by controlling Bi₂O₃/Nb₂O₅In the range of 0.65-1.15, the devitrification resistance of the glass is improved, and the abrasion degree is optimized. Therefore, Bi is more preferable₂O₃/Nb₂O₅0.65 to 1.15, and Bi is more preferable₂O₃/Nb₂O₅0.7 to 1.1. In some embodiments, Bi₂O₃/Nb₂O₅May 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, 1.5.

WO₃Can improve the refractive index and mechanical strength of the glass, reduce the transition temperature of the glass, and in the precise profiling process, WO₃The wettability between the glass material and the mold can be suppressed, and the releasability of the glass can be improved. The invention contains more than 5% of WO₃To obtain the above effects, WO is preferred₃The lower limit of the content of (B) is 7%, and WO is more preferable₃The lower limit of the content of (B) is 9%. If WO₃The content of (b) exceeds 20%, the thermal stability of the glass is reduced, the glass is easily colored in the precision die pressing process, the high-temperature viscosity of the glass is reduced, and the molding difficulty is increased. Thus, WO₃The upper limit of the content of (B) is 20%, preferably 17%, more preferably 15%. In some embodiments, about 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%, 20% of WO₃。

In some embodiments, WO is₃Content of (D) and Bi₂O₃Ratio between contents of WO₃/Bi₂O₃The crystallization resistance and the streak degree of the glass can be improved by controlling the temperature within the range of 0.2-1.0. Thus, WO is preferred₃/Bi₂O₃0.2 to 1.0, more preferably WO₃/Bi₂O₃0.25 to 0.8, and further preferably WO₃/Bi₂O₃0.3 to 0.6. Further, by controlling WO₃/Bi₂O₃In the range of 0.35-0.46, the transition temperature and the thermal expansion coefficient of the glass can be further reduced. Thus, WO is still more preferred₃/Bi₂O₃0.35 to 0.46. In some embodiments, WO₃/Bi₂O₃The value of (b) may 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, 1.0.

In some embodiments, WO is₃And Bi₂O₃WO in total₃+Bi₂O₃And Nb₂O₅And P₂O₅Total content of (2) Nb₂O₅+P₂O₅Ratio of (WO) to (III)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) The chemical stability of the glass can be improved and the light transmittance of the glass can be improved by controlling the chemical stability of the glass within the range of 0.4-1.5. Therefore, preferred is (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.4 to 1.5, and more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.5 to 1.2. Further, byControl (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) In the range of 0.6-1.0, the temperature coefficient of refractive index and the thermal expansion coefficient of the glass can be reduced. Therefore, further preferred (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.6 to 1.0, and more preferably (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) 0.7 to 1.0. In some embodiments, (WO)₃+Bi₂O₃)/(Nb₂O₅+P₂O₅) The value of (b) 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, 1.5.

TiO₂Has the function of improving the refractive index and dispersion of the glass, and the proper content of the additive can ensure that the glass obtains proper Young modulus and prevent the thermal expansion coefficient of the glass from increasing. If TiO₂Too large of (b) results in deterioration of abrasion, transmittance and chemical stability of the glass. Thus, in the present invention, TiO₂The content of (b) is 10% or less, preferably 0.5 to 8%, more preferably 1 to 5%. In some embodiments, about 0%, greater than 0%, 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%, 10% TiO may be included₂。

In some embodiments, Nb is₂O₅And TiO₂Total content of (2) Nb₂O₅+TiO₂With WO₃And Bi₂O₃WO in total₃+Bi₂O₃Ratio (Nb) between₂O₅+TiO₂)/(WO₃+Bi₂O₃) The glass transition temperature can be reduced while the chemical stability of the glass is optimized by controlling the temperature within the range of 0.4-1.5. Therefore, (Nb) is preferable₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.4 to 1.5, and more preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.6 to 1.2. Further, by controlling (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) The Young modulus and density of the glass can be optimized within the range of 0.72-1.0. Therefore, (Nb) is more preferable₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.72 to 1.0, and more preferably (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) 0.75 to 0.92. In some embodiments, (Nb)₂O₅+TiO₂)/(WO₃+Bi₂O₃) The value of (b) 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, 1.5.

In some embodiments, P is₂O₅Content of (2) and Nb₂O₅And TiO₂Total content of (2) Nb₂O₅+TiO₂Ratio P between₂O₅/(Nb₂O₅+TiO₂) The glass is controlled within the range of 0.3-1.2, so that the thermal expansion coefficient of the glass can be reduced, and the light transmittance of the glass can be improved. Therefore, P is preferred₂O₅/(Nb₂O₅+TiO₂) 0.3 to 1.2, more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.4 to 1.0. Further, by controlling P₂O₅/(Nb₂O₅+TiO₂) Within the range of 0.45-0.9, the abrasion degree and the streak degree of the glass can be further optimized. Therefore, P is more preferable₂O₅/(Nb₂O₅+TiO₂) 0.45 to 0.9, and more preferably P₂O₅/(Nb₂O₅+TiO₂) 0.5 to 0.8. In some embodiments, P₂O₅/(Nb₂O₅+TiO₂) May 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, 1.2.

B₂O₃Which can improve the melting and devitrification resistance of the glass, are optional components of the glass of the present invention. By mixing B₂O₃The content of (B) is limited to 8% or less, and the cause B can be prevented₂O₃The excessive content results in a decrease in glass stability and refractive index. Thus, B₂O₃The content of (b) is 8% or less, preferably 5% or less, more preferably 3% or less. In some embodiments, about 0%, greater than 0%, 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% B may be included₂O₃。

Li₂O can lower the glass transition temperature and adjust the viscosity of the glass, but its high content is disadvantageous in chemical stability and thermal expansion coefficient of the glass, and therefore Li in the present invention₂The content of O is 10% or less, preferably 0.5 to 8%, more preferably 1 to 5%. In some embodiments, about 0%, greater than 0%, 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%, 10% Li may be included₂O。

Na₂O has the effects of improving the meltability of the glass, increasing the melting effect of the glass, and lowering the transition temperature of the glass, such as Na₂The content of O exceeds 10%, the chemical stability and weather resistance of the glass are lowered, and therefore Na₂The content of O is 0-10%, preferably Na₂The content of O is 1 to 8%, and Na is more preferable₂The content of O is 2-7%. In some embodiments, about 0%, greater than 0%, 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%, 10% Na may be included₂O。

In some embodiments, Na is substituted with sodium hydroxide₂O and TiO₂Total content of (3) Na₂O+TiO₂With WO₃Ratio between contents of (Na)₂O+TiO₂)/WO₃The temperature is controlled within the range of 0.1-2.0, so that the Young modulus of the glass can be improved while the glass has a low thermal expansion coefficient. Therefore, (Na) is preferred₂O+TiO₂)/WO₃0.1 to 2.0, more preferably (Na)₂O+TiO₂)/WO₃0.2 to 1.5. Further, mixing (Na)₂O+TiO₂)/WO₃The glass hardness and the transition temperature can be optimized by controlling the range of 0.3-1.2. Therefore, (Na) is more preferable₂O+TiO₂)/WO₃0.3 to 1.2, and more preferably (Na)₂O+TiO₂)/WO₃0.4 to 1.0. In some embodiments, (Na)₂O+TiO₂)/WO₃The value of (b) 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, 2.0.

K₂O has an effect of improving the thermal stability and melting property of the glass, but the content thereof exceeds 10%, and the devitrification resistance and chemical stability of the glass are deterioratedThus, in the present invention K₂The content of O is 10% or less, preferably K₂The content of O is 8% or less, more preferably 5% or less. In some embodiments, K may be included at about 0%, greater than 0%, 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%, 10% K₂O。

In some embodiments, by reacting Li₂O、Na₂O、K₂Total content of O Li₂O+Na₂O+K₂O and Bi₂O₃Ratio between contents of (Li)₂O+Na₂O+K₂O)/Bi₂O₃The control range is 0.05-1.0, and the devitrification resistance of the glass can be improved while the light transmittance of the glass is prevented from being reduced. Therefore, (Li) is preferable₂O+Na₂O+K₂O)/Bi₂O₃0.05 to 1.0, more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.1 to 0.8. Further, by controlling (Li)₂O+Na₂O+K₂O)/Bi₂O₃The bubble degree and the abrasion degree of the glass can be further optimized within the range of 0.15-0.6. Therefore, (Li) is more preferable₂O+Na₂O+K₂O)/Bi₂O₃0.15 to 0.6, more preferably (Li)₂O+Na₂O+K₂O)/Bi₂O₃0.2 to 0.5. In some embodiments, (Li)₂O+Na₂O+K₂O)/Bi₂O₃May 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, 1.0.

In some embodiments, by reacting TiO with a catalyst₂With Li₂O、Na₂O、K₂Total content of O Li₂O+Na₂O+K₂Ratio between O TiO₂/(Li₂O+Na₂O+K₂O) is controlled atLess than 1.0, which is beneficial to reducing the density of the glass and optimizing the streak degree and the transmittance of the glass. Therefore, TiO is preferred₂/(Li₂O+Na₂O+K₂O) is 1.0 or less, and TiO is more preferable₂/(Li₂O+Na₂O+K₂O) is 0.02 to 0.8, and TiO is more preferable₂/(Li₂O+Na₂O+K₂O) is 0.05 to 0.6. Further, by controlling TiO₂/(Li₂O+Na₂O+K₂O) is in the range of 0.1-0.38, and the Young modulus and the abrasion degree of the glass can be further optimized. Therefore, TiO is more preferable₂/(Li₂O+Na₂O+K₂O) is 0.1 to 0.38. In some embodiments, the TiO₂/(Li₂O+Na₂O+K₂O) may have a value of 0, greater than 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, 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, 0.95, 0.75, 0.95, 0.75.

RO (RO is one or more of MgO, CaO, SrO, BaO and ZnO) can adjust the refractive index of the glass and improve the devitrification resistance of the glass, and is an optional component in the optical glass of the invention. By controlling the RO content to 10% or less, the glass can be inhibited from lowering in crystallization resistance and chemical stability. Therefore, in the optical glass of the present invention, the upper limit of the range of the RO content is 10%, preferably 8%, more preferably 4%. In some embodiments, about 0%, greater than 0%, 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%, 10% RO may be included.

In some embodiments, byMixing the content of RO with Li₂Ratio between the contents of O RO/Li₂And the O is controlled to be less than 1.0, so that the chemical stability and the thermal stability of the glass are improved. Therefore, RO/Li is preferable₂O is 1.0 or less, and RO/Li is more preferable₂O is 0.7 or less. Further, by controlling RO/Li₂O is less than 0.5, and the devitrification resistance and the Young modulus of the glass can be further optimized. Therefore, RO/Li is more preferable₂O is 0.5 or less, and RO/Li is more preferable₂O is 0.4 or less. In some embodiments, RO/Li₂The value of O may be 0, greater than 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, 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, 1.0.

Ln₂O₃(Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more) is a component for improving the refractive index and chemical stability of the glass by adding Ln₂O₃The content of (B) is controlled to 8% or less, and deterioration of devitrification resistance of the glass can be prevented, and Ln is preferred₂O₃The upper limit of the content range is 5%, and the more preferable upper limit is 3%. In some embodiments, about 0%, greater than 0%, 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% Ln may be included₂O₃。

SiO₂Which can improve the resistance to devitrification and chemical stability of the glass, are optional components of the glass of the present invention. When the content is too high, the glass transition temperature increases, the refractive index decreases and calculus is liable to occur. Thus, SiO in the present invention₂The content of (A) is 5% or less, preferably 3% or less, more preferably2% or less. In some embodiments, about 0%, greater than 0%, 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% SiO may be included₂。

ZrO₂Can improve the refractive index of glass, adjust the dispersion, and improve the devitrification resistance and strength of glass, if ZrO₂If the content of (B) is too large, the glass will be more difficult to melt and the transition temperature will be increased. Thus, ZrO₂The content is 5% or less, preferably 3% or less, and more preferably 2% or less. In some embodiments, about 0%, greater than 0%, 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% ZrO may be included₂。

Al₂O₃The chemical stability of the glass can be improved, but if the content is too high, the devitrification resistance and the melting resistance of the glass decrease, so that the content is 5% or less, preferably 3% or less, more preferably 2% or less, and further preferably no Al is contained₂O₃. In some embodiments, about 0%, greater than 0%, 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% Al may be included₂O₃。

GeO₂The optical glass of the present invention has the effects of increasing the refractive index of the glass and increasing the devitrification resistance, but is an optional component of the optical glass of the present invention, however, it is expensive, contains too much, is disadvantageous in cost reduction, and the light transmittance of the glass is lowered, so that the content thereof is limited to 5% or less, preferably 3% or less, more preferably 2% or less. In some embodiments, it is further preferred that no GeO is present₂. In some embodiments, about 0%, greater than 0%, 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% GeO may be included₂。

In some embodiments, the optical glass can further contain 0-1% of a clarifying agent so as to improve the defoaming capability of the glass. The fining agent includes, but is not limited to, Sb₂O₃、SnO₂SnO and CeO₂Preferably Sb₂O₃As a clarifying agent. The upper limit of the content of the above-mentioned clarifying agent is preferably 0.5%, more preferably 0.2%, when it is present alone or in combination. In some embodiments, one or more of the above fining agents are present in an amount of about 0%, greater than 0%, 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%, 1%.

< component which should not be contained >

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

In recent years, oxides of Th, Cd, Tl, Os, Be, and Se tend to Be used as harmful chemical substances in a controlled manner, and measures for protecting the environment are required not only in the glass production process but also in the processing process and disposal after commercialization. Therefore, when importance is attached to the influence on the environment, it is preferable that these components are not substantially contained except for inevitable mixing. Thereby, the optical glass becomes practically free from substances contaminating the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and discarded without taking special measures for environmental countermeasures. Meanwhile, in order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As₂O₃And PbO.

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

The properties of the optical glass of the present invention will be described below:

< refractive index and Abbe number >

Refractive index (n) of optical glass_d) And Abbe number (v)_d) The test was carried out according to the method specified in GB/T7962.1-2010.

In some embodiments, the refractive index (n) of the optical glass of the present invention_d) The upper limit of (a) is 1.96, the preferred upper limit is 1.95, and the more preferred upper limit is 1.94.

In some embodiments, the refractive index (n) of the optical glass of the present invention_d) The lower limit of (b) is 1.88, preferably the lower limit is 1.90, more preferably the lower limit is 1.91.

In some embodiments, the Abbe number (v) of the optical glass of the present invention_d) The upper limit of (2) is 25, preferably 23, more preferably 22.

In some embodiments, the Abbe number (v) of the optical glass of the present invention_d) The lower limit of (b) is 15, preferably 17, more preferably 18, and still more preferably 19.

< degree of coloration >

Coloring degree (. lamda.) for short-wave transmission spectral characteristics of optical glass₇₀And λ₅) And (4) showing. Lambda [ alpha ]₇₀Refers to the wavelength corresponding to the glass transmittance of 70%. Lambda [ alpha ]₇₀Is measured by measuring the spectral transmittance in a wavelength region from 280nm to 700nm using a glass having a thickness of 10. + -. 0.1mm with two opposing planes parallel to each other and optically polished and exhibiting a wavelength of 70% transmittance. The spectral transmittance or transmittance is the intensity I of light incident perpendicularly to the surface of the glass_inLight transmitted through the glass and having an intensity I emitted from a plane_outIn the case of light of (1) through (I)_out/I_inThe amount indicated and also surface reflection losses on the above-mentioned surface of the glassThe loss of transmission. The higher the refractive index of the glass, the greater the surface reflection loss. Thus, in high refractive index glasses, λ₇₀A small value of (A) means that the glass itself is rarely colored and has a high light transmittance.

In some embodiments, the λ of the optical glass of the present invention₇₀Is 480nm or less, preferably 475nm or less, more preferably 470nm or less, still more preferably 465nm or less, and still more preferably 460nm or less.

In some embodiments, the λ of the optical glass of the present invention₅Is 410nm or less, preferably 405nm or less, more preferably 400nm or less, and further preferably 395nm or less.

< stability against acid Effect >

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

In some embodiments, the stability to acid action of the optical glasses of the invention (D)_A) Is 2 or more, preferably 1.

< stability against Water action >

Stability to Water of optical glass (D)_W) (powder method) the test was carried out according to the method prescribed in GB/T17129.

In some embodiments, the optical glass of the present invention has stability to water effects (D)_W) Is 2 or more, preferably 1.

< upper limit temperature of crystallization >

The crystallization resistance of the optical glass is measured by adopting a gradient temperature furnace method, the glass is made into a sample of 180 multiplied by 10mm, the side surface of the sample is polished, the sample is put into a furnace with a temperature gradient (10 ℃/cm) and the highest temperature zone temperature of 1200 ℃ for heat preservation for 4 hours, then the sample is taken out and naturally cooled to the room temperature, the crystallization condition of the glass is observed under a microscope, and the highest temperature corresponding to the occurrence of crystals of the glass is the crystallization upper limit temperature of the glass.

In some embodiments, the optical glass of the present invention has an upper crystallization limit temperature of 1000 ℃ or lower, preferably 980 ℃ or lower, more preferably 960 ℃ or lower, and still more preferably 950 ℃ or lower.

< Young's modulus >

The Young's modulus (E) of the optical glass is obtained by measuring the longitudinal wave velocity and the transverse wave velocity of the optical glass by ultrasonic waves and calculating according to the following formula.

G＝V_S ²ρ

In the formula: e is Young's modulus, Pa;

g is shear modulus, Pa;

V_Tis the transverse wave velocity, m/s;

V_Sis the longitudinal wave velocity, m/s;

rho is the density of the glass, g/cm³。

In some embodiments, the optical glass of the present invention has a Young's modulus (E) of 8000X 10⁷/Pa or more, preferably 8500X 10⁷/Pa～10000×10⁷/Pa, more preferably 8700X 10⁷/Pa～9500×10⁷/Pa。

< coefficient of thermal expansion >

Coefficient of thermal expansion (alpha) of optical glass_-30/70℃) And (4) testing data at-30-70 ℃ according to a method specified in GB/T7962.16-2010.

The coefficient of thermal expansion (. alpha.) of the optical glass of the present invention_-30/70℃) Is 100 x 10^-7Preferably 95X 10 or less,/K^-7A value of less than or equal to K, more preferably 90X 10^-7and/K is less than or equal to.

< Density >

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

In some embodiments, the optical glass of the present invention has a density (. rho.) of 4.70g/cm³Hereinafter, it is preferably 4.60g/cm³Hereinafter, more preferably 4.50g/cm³The following.

< degree of abrasion >

Degree of abrasion (F) of optical glass_A) Means that the abrasion loss of the sample is equal to that of the sample under the same conditionsThe abrasion loss (volume) ratio of the standard sample (H-K9 glass) was multiplied by 100 to obtain a value, which was expressed by the following equation:

F_A＝V/V₀×100＝(W/ρ)/(W₀/ρ₀)×100

in the formula: v is the volume abrasion amount of the sample to be measured;

V₀-the amount of wear of the standard sample volume;

w is the abrasion loss of the quality of the sample to be measured;

W₀-abrasion loss of standard sample mass;

rho is the density of the sample to be measured;

ρ₀-standard sample density.

In some embodiments, the optical glass of the present invention has an abrasion degree (F)_A) The upper limit of (2) is 400, preferably 380, more preferably 370.

In some embodiments, the optical glass of the present invention has an abrasion degree (F)_A) The lower limit of (b) is 310, the preferred lower limit is 320, and the more preferred lower limit is 340.

< transition temperature >

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

In some embodiments, the transition temperature (T) of the optical glass of the present invention_g) Is 500 ℃ or lower, preferably 495 ℃ or lower, more preferably 490 ℃ or lower, still more preferably 485 ℃ or lower, and still more preferably 480 ℃ or lower.

[ production method ]

The method for manufacturing the optical glass comprises the following steps: the glass of the invention is produced by adopting conventional raw materials and processes, including but not limited to oxides, hydroxides, fluorides, various salts (carbonates, nitrates, sulfates, phosphates, metaphosphates) and the like as raw materials, mixing the raw materials according to a conventional method, putting the mixed furnace charge into a smelting furnace (such as a platinum, gold or platinum alloy crucible) at 800-1200 ℃ for smelting, clarifying and homogenizing to obtain homogeneous molten glass without bubbles and undissolved substances, and casting and annealing the molten glass in a mold. Those skilled in the art can appropriately select the raw materials, the process method and the process parameters according to the actual needs.

Glass preform and optical element

The glass preform can be produced from the optical glass produced by direct gob casting, grinding, or press molding such as hot press molding. That is, a glass preform can be produced by direct precision gob-molding of molten optical glass into a glass precision preform, or by mechanical processing such as grinding and polishing, or by producing a preform for press molding from optical glass, subjecting the preform to reheat press molding, and then performing polishing processing. It should be noted that the means for producing the glass preform is not limited to the above means.

As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to form a preform from the optical glass of the present invention, and use the preform for reheat press forming, precision press forming, or the like to produce optical elements such as lenses, prisms, or the like.

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

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

[ optical instruments ]

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

Examples

< example of optical glass >

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

In this example, optical glasses having compositions shown in tables 1 to 4 were obtained by the above-mentioned method for producing optical glasses. The characteristics of each glass were measured by the test method described in the present invention, and the measurement results are shown in tables 1 to 4.

Table 1.

Table 2.

Table 3.

Table 4.

< glass preform example >

Various lenses such as a concave meniscus lens, a convex meniscus lens, a biconvex lens, a biconcave lens, a plano-convex lens and a plano-concave lens, and preforms such as prisms were produced from the glasses obtained in examples 1 to 26 of optical glass by means of polishing or press molding such as reheat press molding and precision press molding.

< optical element example >

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

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

< optical Instrument example >

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