CN113024107B

CN113024107B - High-refraction high-dispersion optical glass and optical element

Info

Publication number: CN113024107B
Application number: CN202110290272.XA
Authority: CN
Inventors: 匡波
Original assignee: CDGM Glass Co Ltd
Current assignee: CDGM Glass Co Ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2022-04-15
Anticipated expiration: 2041-03-18
Also published as: CN113024107A; WO2022193797A1

Abstract

The invention provides high-refraction high-dispersion optical glass, which comprises the following components in percentage by weight: p₂O₅：8～25％；Bi₂O₃：30～60％；Nb₂O₅：15～35％；WO₃: 3 to 25% of Bi₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3. Through reasonable component design, the optical glass obtained by the invention has lower transformation temperature while having expected refractive index and Abbe number, and is suitable for precision drop forming or precision compression molding.

Description

High-refraction high-dispersion optical glass and optical element

Technical Field

The present invention relates to an optical glass, and particularly to an optical glass having a refractive index of 1.95 or more and an abbe number of 25 or less.

Background

With the rapid development of portable electronic devices (such as mobile phones, PADs, etc.), the demand for small-sized lenses has rapidly increased, and high-refractive optical glass is very important for the development of portable electronic devices because it can obtain a large viewing angle with a small volume and can be used for manufacturing small-sized lenses.

The prior art for producing small-sized lenses generally employs precision drop molding or precision press molding, which requires optical glasses having a low transition temperature (T)_g) CN1896022A discloses a high-refractive-index, high-dispersion optical glass having a refractive index of not less than 2.000 and an Abbe number of not more than 27, but the glass has a high transition temperature and is not favorable for precision drop molding or precision press molding.

Disclosure of Invention

The invention aims to provide high-refraction high-dispersion optical glass with lower transition temperature.

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

high-refractive high-dispersive optical glass, the composition of which is expressed by weight percentage and comprises: p₂O₅：8～25％；Bi₂O₃：30～60％；Nb₂O₅：15～35％；WO₃: 3 to 25% of Bi₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3.

Further, the high-refractive-index and high-dispersion optical glass comprises the following components in percentage by weight: TiO 2₂: 0 to 15 percent; and/or B₂O₃: 0 to 10 percent; and/or RO: 0 to 15 percent; and/or ZnO: 0 to 10 percent; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or SiO₂+Al₂O₃+ZrO₂: 0 to 10 percent; and/or Ln₂O₃: 0 to 10 percent; and/or TeO₂: 0 to 5 percent; and/or GeO₂: 0 to 5 percent; and/or Ga₂O₃: 0 to 5 percent; and/or Ta₂O₅: 0 to 5 percent; and/or a clarifying agent: 0-2% of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

High refractive high dispersive optical glass containing P₂O₅、Nb₂O₅、WO₃And Bi₂O₃As an essential component, the component thereof is expressed in weight percent, wherein Bi₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3, the refractive index n of the high-refractive-index high-dispersion optical glass_dIs more than 1.95, and has Abbe number v_dIs 25 or less, a transition temperature T_gIs below 520 ℃.

Further, the high-refractive-index and high-dispersive optical glass comprises the following components in percentage by weight: p₂O₅: 8-25%; and/or Bi₂O₃: 30-60%; and/or Nb₂O₅: 15-35%; and/or WO₃: 3-25%; and/or TiO₂: 0 to 15 percent; and/or B₂O₃: 0 to 10 percent; and/or RO: 0 to 15 percent; and/or ZnO: 0 to 10 percent; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or SiO₂+Al₂O₃+ZrO₂: 0 to 10 percent; and/or Ln₂O₃: 0 to 10 percent; and/or TeO₂: 0 to 5 percent; and/or GeO₂: 0 to 5 percent; and/or Ga₂O₃: 0 to 5 percent; and/or Ta₂O₅: 0 to 5 percent; and/or a clarifying agent: 0-2% of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

Further, the components of the high-refractive-index and high-dispersive optical glass are expressed by weight percent and satisfy more than one of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.7 to 2.0, preferably Bi₂O₃/(Nb₂O₅+P₂O₅) 0.8 to 1.5, and Bi is more preferable₂O₃/(Nb₂O₅+P₂O₅) 0.9 to 1.3;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.3 to 1.3, preferably (Nb)₂O₅+TiO₂)/Bi₂O₃0.4 to 1.0, more preferably (Nb)₂O₅+TiO₂)/Bi₂O₃0.5 to 0.8, and more preferably (Nb)₂O₅+TiO₂)/Bi₂O₃0.55 to 0.75;

3)(Nb₂O₅+P₂O₅)/WO₃1.0 to 15.0, preferably (Nb)₂O₅+P₂O₅)/WO₃1.5 to 12.0, more preferably (Nb)₂O₅+P₂O₅)/WO₃2.5 to 10.0, more preferably(Nb₂O₅+P₂O₅)/WO₃3.0 to 7.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 0.2 or more, and WO is preferable₃/(Li₂O+Na₂O+K₂O) is 0.5 or more, and WO is more preferable₃/(Li₂O+Na₂O+K₂O) is 1.0 to 15.0, and WO is more preferably used₃/(Li₂O+Na₂O+K₂O) is 1.5 to 8.0;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.5 to 2.5, preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.7 to 2.0, more preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.8 to 1.8, and more preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃1.0 to 1.5.

Further, the components of the high-refraction high-dispersion optical glass are expressed by weight percent and satisfy more than one of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.4 to 2.0, preferably (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.5 to 1.5, and more preferably (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.6 to 1.2, and more preferably (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.65 to 1.0;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) Is 0.1 or more, preferably TiO₂/(SiO₂+Al₂O₃+ZrO₂) Is 0.3 or more, and TiO is more preferable₂/(SiO₂+Al₂O₃+ZrO₂) 0.5 to 20.0, and further preferably TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.8 to 10.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.3 to 1.0, preferably Na₂O/(Li₂O+Na₂O+K₂O) is 0.4 to 0.9, more preferably Na₂O/(Li₂O+Na₂O+K₂O) is 0.5 to 0.8, and Na is more preferable₂O/(Li₂O+Na₂O+K₂O) is 0.5 to 0.75;

4)ZnO/(TiO₂+ BaO) is 5.0 or less, preferably ZnO/(TiO)₂+ BaO) is 3.0 or less, and ZnO/(TiO) is more preferable₂+ BaO is 1.5 or less, and ZnO/(TiO) is more preferable₂+ BaO) is 0.8 or less.

Further, the high-refractive-index and high-dispersive optical glass comprises the following components in percentage by weight: p₂O₅: 12 to 22%, preferably P₂O₅: 13-19%; and/or Bi₂O₃: 35 to 55%, preferably Bi₂O₃: 38-50%; and/or Nb₂O₅: 18 to 30%, preferably Nb₂O₅: 20-28%; and/or WO₃: 4 to 20%, preferably WO₃: 6-15%; and/or TiO₂: 0.5-8%, preferably TiO₂: 1-5%; and/or B₂O₃: 0 to 8%, preferably B₂O₃: 0 to 5 percent; and/or RO: 0-9%, preferably RO: 0 to 5 percent; and/or ZnO: 0-6%, preferably ZnO: 0 to 5 percent; and/or Li₂O: 0 to 5%, preferably Li₂O: 0 to 3 percent; and/or Na₂O: 0.5-8%, preferably Na₂O: 1-6%; and/or K₂O: 0 to 6%, preferably K₂O: 0 to 5 percent; and/or SiO₂+Al₂O₃+ZrO₂: greater than 0 but less than or equal to 8%, preferably SiO₂+Al₂O₃+ZrO₂: 0.1-5%; and/or Ln₂O₃: 0 to 5%, preferably Ln₂O₃: 0 to 3 percent; and/or TeO₂: 0 to 3%, preferably TeO₂: 0 to 1 percent; and/or GeO₂: 0 to 3%, preferably GeO₂: 0 to 1 percent; and/or Ga₂O₃: 0 to 3%, preferably Ga₂O₃: 0 to 1 percent; and/or Ta₂O₅: 0 to 3%, preferably Ta₂O₅: 0 to 1 percent; and/or a clarifying agent: 0-1%, preferably clarifying agent: 0 to 0.5 percent of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

Further, the high-refraction high-dispersion optical glass does not contain Ta in the components₂O₅(ii) a And/or does not contain GeO₂(ii) a And/or does not contain Ln₂O₃(ii) a And/or does not contain TeO₂(ii) a And/or does not contain Ga₂O₃。

Further, the refractive index n of the high-refraction high-dispersion optical glass_d1.95 or more, preferably 1.97 or more, more preferably 1.99 or more; abbe number v_dIs 25 or less, preferably 23 or less, more preferably 21 or less.

Further, the acid-resistant stability of the high-refractive high-dispersive optical glass D_AIs 2 or more, preferably 1; and/or stability against water action D_WIs 2 or more, preferably 1; and/or the weather resistance CR is of class 2 or more, preferably of class 1; and/or coefficient of thermal expansion alpha_-30/70℃Is 110 x 10^-7Preferably 100X 10 or less,/K^-7A value of less than or equal to K, more preferably 90X 10^-7below/K; and/or transition temperature T_g520 ℃ or lower, preferably 510 ℃ or lower, more preferably 500 ℃ or lower, and further preferably 495 ℃ or lower; and/or degree of wear F_A390 or less, preferably 380 or less, more preferably 360 or less; and/or Knoop hardness H_KIs 350X 10⁷Pa or more, preferably 360X 10⁷Pa or more, more preferably 370X 10⁷Pa or more, and more preferably 380X 10⁷Pa is above; and/or lambda₇₀485nm or less, preferably 480nm or less, more preferably 470nm or less; and/or lambda₅Is 425nm or less, preferably 420nm or less, more preferably 410nm or less.

The glass preform is made of the high-refraction high-dispersion optical glass.

The optical element is made of the high-refraction high-dispersion optical glass or the glass prefabricated member.

An optical instrument comprising the above high-refractive high-dispersive optical glass, and/or comprising the above optical element.

The invention has the beneficial effects that: through reasonable component design, the optical glass obtained by the invention has lower transformation temperature while having expected refractive index and Abbe number, and is suitable for precision drop forming or precision compression molding.

Detailed Description

The present invention is not limited to the embodiments described below, and can be carried out with appropriate modifications 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 high-refractive high-dispersive optical glass of the invention is sometimes referred to simply as optical glass or glass.

[ high refractive index and high dispersive optical glass ]

The ranges of the respective components (ingredients) of the high-refractive high-dispersive optical glass of the present invention are described 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%.

Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. 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 product of the present invention has the effects 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, the glass product contains 8% or more of P₂O₅To obtain the above effects, P is preferred₂O₅Is 12% or more, more preferably P₂O₅The content of (A) is 13% or more. On the other hand, if P₂O₅In excess of 25%, it is difficult to obtain a desired high refractive index of the glass, and the devitrification tendency of the glass increases. Thus, P in the present invention₂O₅The content of (b) is 25% or less, preferably 22% or less, more preferably 19% or less.

Bi₂O₃Can increase the refractive index of the glass and reduce the transition temperature, and the glass contains more than 30 percent of Bi₂O₃To obtain the above effects, Bi is preferred₂O₃Is 35% or more, and Bi is more preferable₂O₃The content of (A) is 38% or more. If Bi₂O₃The content of (b) exceeds 60%, the light transmittance of the glass is lowered, the abrasion degree and chemical stability are deteriorated, and the density is remarkably increased. Thus, Bi₂O₃The upper limit of the content of (B) is 60%, preferably 55%, more preferably 50%.

Nb₂O₅Is a high-refraction high-dispersion component, can improve the refractive index, the light transmittance and the devitrification resistance of the glass and reduce the thermal expansion coefficient of the glass, and the inventionBy containing 15% or more of Nb₂O₅To obtain the above effects, Nb is preferable₂O₅The lower limit of the content of (B) is 18%, and Nb is more preferable₂O₅The lower limit of the content of (B) is 20%. If Nb₂O₅More than 35%, the thermal and chemical stability of the glass is lowered and the light transmittance is lowered, so that Nb in the present invention is₂O₅The upper limit of the content of (B) is 35%, preferably 30%, more preferably 28%.

Through extensive experimental studies by the inventors, it was found that, in some embodiments, Bi is added₂O₃Content of (2) and Nb₂O₅And P₂O₅Total content of (Nb)₂O₅+P₂O₅) Ratio between Bi₂O₃/(Nb₂O₅+P₂O₅) The control is within the range of 0.6-2.3, the optical glass can effectively reduce the transition temperature of the glass and obtain proper abrasion degree while obtaining expected high refraction and high dispersion. Therefore, Bi is preferred₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3, and Bi is more preferable₂O₃/(Nb₂O₅+P₂O₅) 0.7 to 2.0, and Bi is more preferable₂O₃/(Nb₂O₅+P₂O₅) 0.8 to 1.5, and Bi is more preferable₂O₃/(Nb₂O₅+P₂O₅) 0.9 to 1.3.

WO₃Can improve the refractive index, the middle dispersion and the mechanical strength of the glass and reduce the transition temperature of the glass, and the invention contains more than 3 percent of WO₃To obtain the above effects, WO is preferred₃The lower limit of the content of (B) is 4%, and WO is more preferable₃The lower limit of the content of (B) is 6%. If WO₃When the content of (B) exceeds 25%, the glass is deteriorated in thermal stability and devitrification resistance. Thus, WO₃The upper limit of the content of (B) is 25%, preferably 20%, more preferably 15%.

In some embodiments, by reacting Nb₂O₅And P₂O₅Total content of (Nb)₂O₅+P₂O₅) With WO₃Ratio between contents of (Nb)₂O₅+P₂O₅)/WO₃The weather resistance of the glass can be improved by controlling the temperature within the range of 1.0-15.0. Therefore, (Nb) is preferable₂O₅+P₂O₅)/WO₃1.0 to 15.0, more preferably (Nb)₂O₅+P₂O₅)/WO₃Is 1.5 to 12.0. Further, by reacting (Nb)₂O₅+P₂O₅)/WO₃The abrasion degree of the glass can be further optimized within the range of 2.5-10.0. Therefore, (Nb) is more preferable₂O₅+P₂O₅)/WO₃2.5 to 10.0, and more preferably (Nb)₂O₅+P₂O₅)/WO₃Is 3.0 to 7.0.

TiO₂The glass has the effects of obviously improving the refractive index and dispersion of the glass, participating in the formation of a glass network, improving the chemical stability of the glass, and enabling the glass to be more stable and reducing the viscosity of the glass by containing a proper amount of the glass. If TiO, however₂When the content exceeds 15%, the glass tends to be more devitrified, the glass transition temperature rises, and the glass color degree increases. Thus, TiO in the present invention₂The content of (b) is 15% or less, preferably 0.5 to 8%, more preferably 1 to 5%.

In some embodiments, Nb is₂O₅、WO₃、TiO₂And P₂O₅Total content of (Nb)₂O₅+WO₃+TiO₂+P₂O₅) And Bi₂O₃Ratio between contents of (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃The weather resistance and the hardness of the glass can be improved by controlling the content of the glass to be within the range of 0.5-2.5. Therefore, (Nb) is preferable₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.5 to 2.5, and more preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.7 to 2.0, and more preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.8 to 1.8, and more preferably (Nb)₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃1.0 to 1.5.

In some embodiments of the invention, Nb is₂O₅And TiO₂Total content of (Nb)₂O₅+TiO₂) And Bi₂O₃Ratio between contents of (Nb)₂O₅+TiO₂)/Bi₂O₃The control range of 0.3-1.3 can ensure that the glass can obtain the expected optical constant, and is beneficial to improving the stability and reducing the density. Therefore, (Nb) is preferable₂O₅+TiO₂)/Bi₂O₃0.3 to 1.3, and more preferably (Nb)₂O₅+TiO₂)/Bi₂O₃0.4 to 1.0. Further, will (Nb)₂O₅+TiO₂)/Bi₂O₃The chemical stability and the abrasion degree of the glass can be further optimized by controlling the content of the glass to be within the range of 0.5-0.8. Therefore, (Nb) is more preferable₂O₅+TiO₂)/Bi₂O₃0.5 to 0.8, and more preferably (Nb)₂O₅+TiO₂)/Bi₂O₃0.55 to 0.75.

B₂O₃As network formers, their action with P₂O₅Similarly. In the presence of P₂O₅Adding a proper amount of B into the glass₂O₃The lamellar or interwoven chain structure can tend to a skeleton structure, and the devitrification resistance and the chemical stability of the glass are improved. But B₂O₃If the content is more than 10%, the refractive index of the glass decreases, the temperature coefficient of refractive index increases, and the devitrification resistance deteriorates. Thus, B₂O₃The content of (b) is limited to 0 to 10%, preferably 0 to 8%, more preferably 0 to 5%.

RO (RO is one or more of BaO, SrO, CaO and MgO) can be used in the present invention to adjust the optical constants of the glass and improve the light transmittance of the glass, and if the content exceeds 15%, the devitrification resistance and chemical stability of the glass are deteriorated. Therefore, the content of RO is 0 to 15%, preferably 0 to 9%, and more preferably 0 to 5%. In order to make the glass easier to obtain the desired excellent properties, RO is preferably BaO in the present invention.

In some embodiments of the invention, the Nb is reduced₂O₅、P₂O₅、TiO₂And the total content of BaO (Nb)₂O₅+P₂O₅+TiO₂+ BaO) and Bi₂O₃And WO₃Total content of (Bi)₂O₃+WO₃) Ratio (Nb) between₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) The glass forming stability and devitrification resistance of the glass can be improved within the range of 0.4-2.0. Therefore, (Nb) is preferable₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.4 to 2.0, more preferably (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.5 to 1.5. Further, by reacting (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) The hardness and chemical stability of the glass can be further improved within the range of 0.6-1.2. Therefore, (Nb) is more preferable₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.6 to 1.2, and more preferably (Nb)₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.65 to 1.0.

ZnO can adjust the refractive index and dispersion of glass, improve the stability of the glass, and simultaneously ZnO can reduce the high-temperature viscosity and the transition temperature of the glass, so that the glass can be melted at a lower temperature, and the light transmittance of the glass is improved. On the other hand, if the content of ZnO is too high, the refractive index of the glass decreases, and the devitrification resistance is deteriorated. Therefore, the content of ZnO is 0 to 10%, preferably 0 to 6%, and more preferably 0 to 5%.

In some embodiments of the invention, the amount of ZnO is related to the amount of TiO₂And the total content of BaO (TiO)₂Ratio between + BaO ZnO/(TiO)₂And + BaO) is controlled to 5.0 or less, thereby preventing the thermal expansion coefficient of the glass from increasing and the devitrification resistance from deteriorating. Therefore, ZnO/(TiO) is preferable₂+ BaO is 5.0 or less, and ZnO/(TiO) is more preferable₂+ BaO) is 3.0 or less. Further, ZnO/(TiO)₂And the + BaO) is controlled to be below 1.5, so that the high-temperature viscosity of the glass is favorably optimized, and the striae and bubble degree of the glass are improved. Therefore, ZnO/(TiO) is more preferable₂+ BaO is 1.5 or less, and ZnO/(TiO) is more preferable₂+ BaO) is 0.8 or less.

Li₂O can lower the glass transition temperature, but its high content is disadvantageous in acid resistance and thermal expansion coefficient of the glass. Thus, Li in the present invention₂The content of O is 0 to 10%, preferably 0 to 5%, more preferably 0 to 3%.

Na₂O has the effect of improving the meltability of the glass and also lowers the glass transition temperature, if Na₂The O content exceeds 10%, and the chemical stability and weather resistance of the glass are lowered. Thus, Na₂The content of O is 0 to 10%, preferably 0.5 to 8%, more preferably 1 to 6%.

K₂O has the effect of improving the thermal stability and melting property of the glass, but if the content thereof exceeds 10%, the devitrification resistance of the glass is lowered and the chemical stability is deteriorated. Therefore, K in the present invention₂The content of O is 0 to 10%, preferably 0 to 6%, more preferably 0 to 5%.

Li₂O、Na₂O、K₂O is an alkali metal oxide, in some embodiments, by reacting Na₂O/(Li₂O+Na₂O+K₂O) is within the range of 0.3-1.0, which is beneficial to improving the anti-crystallization performance and the light transmittance of the glass. Therefore, Na is preferred₂O/(Li₂O+Na₂O+K₂O) is 0.3 to 1.0, more preferably Na₂O/

(Li₂O+Na₂O+K₂O) is 0.4 to 0.9. Further, by reacting Na₂O/(Li₂O+Na₂O+K₂O) is within the range of 0.5-0.8, and is also beneficial to improving the weather resistance of the glass. Therefore, Na is more preferable₂O/(Li₂O+Na₂O+K₂O) is 0.5 to 0.8, and Na is more preferable₂O/(Li₂O+Na₂O+K₂O) is 0.5 to 0.75.

In some embodiments of the invention, the composition is prepared by contacting WO₃The total content of (A) and (B) and the total content of alkali metal oxides (Li)₂O+Na₂O+K₂O) ratio WO) between₃/(Li₂O+Na₂O+K₂O) is more than 0.2, the abrasion degree of the glass can be optimized, and the thermal expansion coefficient of the glass can be reduced. Thus, WO is preferred₃/(Li₂O+Na₂O+K₂O) is 0.2 or more, and WO is more preferable₃/(Li₂O+Na₂O+K₂O) is 0.5 or more. Further, by using WO₃/(Li₂O+Na₂O+K₂O) is within the range of 1.0-15.0, the reduction of the glass light transmittance can be prevented, and the anti-crystallization performance is optimized. Therefore, WO is further preferable₃/(Li₂O+Na₂O+K₂O) is 1.0 to 15.0, and further preferably WO₃/(Li₂O+Na₂O+K₂O) is 1.5 to 8.0.

SiO₂、Al₂O₃And ZrO₂Has the functions of improving the mechanical property of the glass and improving the stability of the glass, but when the content is high, the transition temperature of the glass is increased. Thus, SiO in the present invention₂、Al₂O₃And ZrO₂SiO in total content₂+Al₂O₃+ZrO₂0 to 10%, preferably SiO₂+Al₂O₃+ZrO₂Greater than 0 but less than or equal to 8%, and SiO is more preferable₂+Al₂O₃+ZrO₂0.1 to 5%.

In some embodiments of the invention, the composition is prepared by reacting TiO with a suitable solvent₂/(SiO₂+Al₂O₃+ZrO₂) At least one of the amount of the organic acid is 0.1,the method is beneficial to adjusting the forming viscosity of the glass and optimizing the stripe degree of the glass. Therefore, TiO is preferred₂/(SiO₂+Al₂O₃+ZrO₂) Is 0.1 or more, and TiO is more preferable₂/(SiO₂+Al₂O₃+ZrO₂) Is 0.3 or more. Further, by making TiO₂/(SiO₂+Al₂O₃+ZrO₂) In the range of 0.5-20.0, the glass can obtain a low thermal expansion coefficient and prevent the hardness of the glass from being low. Therefore, TiO is more preferable₂/(SiO₂+Al₂O₃+ZrO₂) 0.5 to 20.0, and further preferably TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.8 to 10.0.

Ln₂O₃(Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃One or more) of which can increase the refractive index and chemical stability of the glass, are optional components in the optical glass of the present invention. By mixing Ln₂O₃Is controlled to 10% or less, and is preferably Ln, which prevents the devitrification resistance of the glass from being lowered₂O₃The upper limit of the content is 5%, and the upper limit is more preferably 3%. In some embodiments, it is further preferred that Ln is absent₂O₃。

TeO₂Is an optional component for increasing the refractive index of the glass and lowering the transition temperature of the glass, and when the content thereof is excessive, it is liable to react with the platinum crucible, seriously impairing the service life of the production equipment. Thus TeO₂The content is limited to 5% or less, preferably 3% or less, and more preferably 1% or less. In some embodiments, it is further preferred that TeO is not present₂。

GeO₂Has the effects of increasing the refractive index of the glass and increasing the devitrification resistance, is an optional component of the optical glass of the present invention, however, it is expensive, contains an excessive amount thereof to be 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 3% or less1% or less. In some embodiments, it is further preferred that no GeO is present₂。

As an optional component of the present invention by controlling Ga₂O₃The content of (A) is 5% or less, whereby the devitrification resistance of the glass can be improved and the degree of abrasion of the glass can be optimized. Thus, Ga₂O₃The content of (b) is 5% or less, preferably 3% or less, more preferably 1% or less. In some embodiments, it is further preferred that Ga is not present₂O₃。

Ta₂O₅Has the functions of improving the refractive index and improving the devitrification resistance of the glass, but the content is too high, the chemical stability of the glass is reduced, and Ta is compared with other components₂O₅The price of (2) is very expensive, and the amount of use should be minimized from the practical and cost viewpoints. Thus, Ta in the present invention₂O₅The content of (B) is limited to 0 to 5%, preferably 0 to 3%, more preferably 0 to 1%. In some embodiments, it is further preferred that Ta is not included₂O₅。

In the invention, 0-2% of Sb is contained₂O₃、SnO、SnO₂、CeO₂One or more components in the glass can be used as a clarifying agent to improve the clarifying effect of the glass, and the content of the clarifying agent is preferably 0-1%, and more preferably 0-0.5%. Sb is preferably used₂O₃As a clarifying agent, it has an effect of improving glass coloring.

< 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.

To be environmentally friendly, the high-refractive high-dispersive optical glass of the invention preferably does not contain As₂O₃And PbO.

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

The performance of the high-refractive high-dispersive 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) Is 1.95 or more, preferably 1.97 or more, and more preferably 1.99 or more.

In some embodiments, the Abbe number (v) of the optical glass of the present invention_d) Is 25 or less, preferably 23 or less, more preferably 21 or less.

< 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 520 ℃ or lower, preferably 510 ℃ or lower, more preferably 500 ℃ or lower, and still more preferably 49 ℃Below 5 ℃.

< degree of coloration >

Coloring degree (. lamda.) for short-wave transmission spectral characteristics of the glass of the present invention₇₀And 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 quantity expressed and also the transmission of the surface reflection losses on the above-mentioned surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Thus, in high refractive index glasses, 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 485nm or less, preferably lambda₇₀Is 480nm or less, more preferably lambda₇₀Is 470nm or less.

In some embodiments, the λ of the optical glass of the present invention₅Is 425nm or less, preferably lambda₅Is 420nm or less, more preferably lambda₅Is 410nm or less.

< 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.

< 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.

< weather resistance >

The weather resistance (CR) of the optical glass was measured in the following manner.

And placing the sample in a test box in a saturated water vapor environment with the relative humidity of 90%, and alternately circulating at 40-50 ℃ every 1 hour for 15 periods. The weather resistance categories were classified according to the amount of change in turbidity before and after the sample was left, and Table 1 shows the weather resistance categories.

TABLE 1 weather resistance Classification

In some embodiments, the optical glass of the present invention has a weatherability (CR) of 2 or more, preferably 1.

< coefficient of thermal expansion >

The coefficient of thermal expansion (alpha) of the optical glass of the present invention_-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 110 x 10^-7Preferably 100X 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.

< degree of abrasion >

Degree of abrasion (F) of optical glass_A) The abrasion loss of the sample is multiplied by 100 under the same conditions, and the value is expressed by the following formula:

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.

Degree of abrasion (F) of optical glass of the present invention_A) 390 or less, preferably 380 or less, and more preferably 360 or less.

< Knoop hardness >

Knoop hardness (H) of optical glass_K) The test was carried out according to the test method specified in GB/T7962.18-2010.

In some embodiments, the Knoop hardness (H) of the optical glasses of the present invention_K) Is 350X 10⁷Pa or more, preferably 360X 10⁷Pa or more, more preferably 370X 10⁷Pa or more, and more preferably 380X 10⁷Pa or above.

[ method for producing optical glass ]

The method for manufacturing the optical glass comprises the following steps: the glass of the invention can be produced by adopting conventional raw materials and processes, including but not limited to carbonate, nitrate, phosphate, metaphosphate, pyrophosphate, hydroxide, oxide, fluoride and the like as raw materials, after being mixed by a conventional method, the mixed furnace burden is put into a smelting furnace (such as a platinum or platinum alloy crucible, gold or an alloy crucible containing gold) at 800-1100 ℃ for smelting, and after being clarified and homogenized, homogeneous molten glass without bubbles and undissolved substances is obtained, and the molten glass is cast and annealed in a mould.

The glass of the invention can also be produced by adopting a secondary smelting mode, namely, the mixture of the raw materials is firstly put into a quartz, alumina or zirconium crucible for smelting, the clinker is prepared after the smelting is finished, and then the clinker is put into a platinum or platinum alloy crucible (or a gold or alloy crucible containing gold) for smelting, thereby obtaining the required high-quality glass.

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 made from the high-refractive high-dispersive 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 high-refractive-index, high-dispersion 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 high-refractive-index, high-dispersion 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 and the optical element of the present invention are each formed of the above-described high-refractive high-dispersive optical glass of the present invention. The glass prefabricated member has excellent characteristics of high-refraction and high-dispersion optical glass; the optical element of the present invention has excellent characteristics of high-refractive-index, high-dispersion optical glass, and can provide various optical elements such as 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 high-refraction high-dispersion 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

< high refractive index high dispersive optical glass example >

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, high-refractive and high-dispersive optical glasses having compositions shown in tables 2 to 4 were obtained by the above-described 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 2 to 4.

Table 2.

Table 3.

Table 4.

< glass preform example >

The glasses obtained in the examples of the high-refractive-index, high-dispersive optical glass in tables 2 to 4 are subjected to polishing or press molding such as reheat press molding or precision press molding 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 preforms such as prisms.

< optical element example >

The preforms obtained from the above glass preform examples were annealed to reduce the internal stress of the glass and to fine-tune the refractive index so that the optical properties such as refractive index reached the 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 produced by the above-described optical element embodiments can be used, for example, for imaging devices, sensors, microscopes, medical technology, digital projection, communication, optical communication technology/information transmission, optics/illumination in the automotive field, lithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, by optical design, by forming an optical component or optical assembly using one or more optical elements.

Claims

1. High-refractive-index, high-dispersive optical glass, characterized in that its composition, expressed in weight percentages, comprises: p₂O₅：8～25％；Bi₂O₃：30～60％；Nb₂O₅：15～35％；WO₃: 3 to 25% of Bi₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3, WO₃/(Li₂O+Na₂O+K₂O) is 1.851 or more and ZnO/(TiO)₂+ BaO) is 0.013-5.0.

2. A high-refractive-index, high-dispersive optical glass according to claim 1, characterized in that it further comprises, in percentages by weight: TiO 2₂: 0 to 15 percent; and/or B₂O₃: 0 to 10 percent; and/or RO: 0 to 15 percent; and/or ZnO:0 to 10 percent; and/or Li₂O: 0 to 10 percent; and/or Na₂O: 0 to 10 percent; and/or K₂O: 0 to 10 percent; and/or SiO₂+Al₂O₃+ZrO₂: 0 to 10 percent; and/or Ln₂O₃: 0 to 10 percent; and/or TeO₂: 0 to 5 percent; and/or GeO₂: 0 to 5 percent; and/or Ga₂O₃: 0 to 5 percent; and/or Ta₂O₅: 0 to 5 percent; and/or a clarifying agent: 0-2% of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

3. High-refractive high-dispersive optical glass, characterised in that it contains P₂O₅、Nb₂O₅、WO₃And Bi₂O₃The components of the composition are expressed by weight percentage and comprise: p₂O₅：8～25％；Bi₂O₃：30～60％；Nb₂O₅：15～35％；WO₃: 3 to 25% of Bi₂O₃/(Nb₂O₅+P₂O₅) 0.6 to 2.3, TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.1 to 10.0, the refractive index n of the high-refractive-index high-dispersion optical glass_dIs more than 1.95, and has Abbe number v_dIs 25 or less, a transition temperature T_gIs below 520 ℃.

4. A high-refractive-index, high-dispersive optical glass according to claim 3, characterized in that its composition, expressed in weight percentages, comprises: TiO 2₂：0～15％；B₂O₃：0～10％；RO：0～15％；ZnO：0～10％；Li₂O：0～10％；Na₂O：0～10％；K₂O：0～10％；SiO₂+Al₂O₃+ZrO₂：0～10％；Ln₂O₃：0～10％；TeO₂：0～5％；GeO₂：0～5％；Ga₂O₃：0～5％；Ta₂O₅: 0 to 5 percent; a clarifying agent: 0-2% of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

5. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.7 to 2.0;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.3 to 1.3;

3)(Nb₂O₅+P₂O₅)/WO₃1.0 to 15.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 1.851 to 15.0;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.5 to 2.5.

6. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.8 to 1.5;

2)(Nb₂O₅+TiO₂)/Bi₂O₃is 0.4～1.0；

3)(Nb₂O₅+P₂O₅)/WO₃1.5 to 12.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 1.851 to 8.0;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.7 to 2.0.

7. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.9 to 1.3;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.5 to 0.8;

3)(Nb₂O₅+P₂O₅)/WO₃2.5 to 10.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 1.871 to 8.0

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.8 to 1.8.

8. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+TiO₂)/Bi₂O₃0.55 to 0.75;

2)(Nb₂O₅+P₂O₅)/WO₃3.0 to 7.0;

3)WO₃/(Li₂O+Na₂O+K₂o) is 1.978 to 5.033;

4)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃1.0 to 1.5.

9. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.7 to 2.0;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.3 to 1.3;

3)(Nb₂O₅+P₂O₅)/WO₃1.0 to 15.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 0.2 or more;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.5 to 2.5.

10. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.8 to 1.5;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.4 to 1.0;

3)(Nb₂O₅+P₂O₅)/WO₃1.5 to 12.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 0.5 or more;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.7 to 2.0.

11. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 5 conditions:

1)Bi₂O₃/(Nb₂O₅+P₂O₅) 0.9 to 1.3;

2)(Nb₂O₅+TiO₂)/Bi₂O₃0.5 to 0.8;

3)(Nb₂O₅+P₂O₅)/WO₃2.5 to 10.0;

4)WO₃/(Li₂O+Na₂O+K₂o) is 1.0 to 15.0;

5)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃0.8 to 1.8.

12. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+TiO₂)/Bi₂O₃0.55 to 0.75;

2)(Nb₂O₅+P₂O₅)/WO₃3.0 to 7.0;

3)WO₃/(Li₂O+Na₂O+K₂o) is 1.86 to 6.2;

4)(Nb₂O₅+WO₃+TiO₂+P₂O₅)/Bi₂O₃1.0 to 1.5.

13. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.4 to 2.0;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) Is above 0.1;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.3 to 1.0;

4)ZnO/(TiO₂+ BaO) is 0.013-3.0.

14. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.5 to 1.5;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) Is more than 0.3;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.4 to 0.9;

4)ZnO/(TiO₂+ BaO) is 0.013 ~ 1.5.

15. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.6 to 1.2;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.5 to 20.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.5 to 0.8;

4)ZnO/(TiO₂+ BaO) is 0.013 ~ 0.8.

16. A high-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.65 to 1.0;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.8 to 10.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.5 to 0.75;

4)ZnO/(TiO₂and + BaO) is 0.028 to 0.385.

17. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.4 to 2.0;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.3 to 10.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.3 to 1.0;

4)ZnO/(TiO₂+ BaO) is 5.0 or less.

18. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.5 to 1.5;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.5 to 10.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.4 to 0.9;

4)ZnO/(TiO₂+ BaO) is 3.0 or less.

19. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.6 to 1.2;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.8 to 10.0;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.5 to 0.8;

4)ZnO/(TiO₂+ BaO) is 1.5 or less.

20. A high-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterised in that its composition, expressed in weight percentage, satisfies one or more of the following 4 conditions:

1)(Nb₂O₅+P₂O₅+TiO₂+BaO)/(Bi₂O₃+WO₃) 0.65 to 1.0;

2)TiO₂/(SiO₂+Al₂O₃+ZrO₂) 0.8 to 6;

3)Na₂O/(Li₂O+Na₂O+K₂o) is 0.5 to 0.75;

4)ZnO/(TiO₂and + BaO) is 0.016 to 0.8.

21. A high-refractive-index, high-dispersive optical glass according to any of claims 1 to 4, characterized in that its composition, expressed in weight percentages, comprises: p₂O₅: 12-22%; and/or Bi₂O₃: 35-55%; and/or Nb₂O₅: 18-30%; and/or WO₃: 4-20%; and/or TiO₂: 0.5-8%; and/or B₂O₃: 0-8%; and/or RO: 0 to 9 percent; and/or ZnO: 0-6%; and/or Li₂O: 0 to 5 percent; and/or Na₂O: 0.5-8%; and/or K₂O: 0-6%; and/or SiO₂+Al₂O₃+ZrO₂: greater than 0 but less than or equal to 8%; and/or Ln₂O₃: 0 to 5 percent; and/or TeO₂: 0 to 3 percent; and/or GeO₂: 0 to 3 percent; and/or Ga₂O₃: 0 to 3 percent; and/or Ta₂O₅: 0 to 3 percent; and/or a clarifying agent: 0 to 1 percent of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

22. A high-refractive-index, high-dispersive optical glass according to any of claims 1 to 4, characterized in that its composition, expressed in weight percentages, comprises: p₂O₅: 13-19%; and/or Bi₂O₃: 38-50%; and/or Nb₂O₅: 20-28%; and/or WO₃: 6-15%; and/or TiO₂: 1-5%; and/or B₂O₃: 0 to 5 percent; and/or RO: 0 to 5 percent; and/or ZnO: 0 to 5 percent; and/or Li₂O: 0 to 3 percent; and/or Na₂O: 1-6%; and/or K₂O: 0 to 5 percent; and/or SiO₂+Al₂O₃+ZrO₂: 0.1-5%; and/or Ln₂O₃: 0 to 3 percent; and/or TeO₂: 0 to 1 percent; and/or GeO₂: 0 to 1 percent; and/or Ga₂O₃: 0 to 1 percent; and/or Ta₂O₅: 0 to 1 percent; and/or a clarifying agent: 0 to 0.5 percent of Ln₂O₃Is La₂O₃、Gd₂O₃、Y₂O₃、Yb₂O₃、Lu₂O₃RO is one or more of BaO, SrO, CaO and MgO, and the clarifying agent is Sb₂O₃、SnO、SnO₂、CeO₂One or more of (a).

23. A high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein Ta is not contained in its composition₂O₅(ii) a And/or does not contain GeO₂(ii) a And/or does not contain Ln₂O₃(ii) a And/or does not contain TeO₂(ii) a And/or does not contain Ga₂O₃。

24. High-refractive-index, high-dispersive optical glass according to claim 1 or 2, characterised in that it has a refractive index n_dIs 1.95 or more; abbe number v_dIs 25 or less.

25. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.95 or more; abbe number v_dIs 23 or less.

26. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.95 or more; abbe number v_dIs 21 or less.

27. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.97 or more; abbe number v_dIs 25 or less.

28. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.97 or more; abbe number v_dIs 23 or less.

29. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.97 or more; abbe number v_dIs 21 or less.

30. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.99 or more; abbe number v_dIs 25 or less.

31. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.99 or more; abbe number v_dIs 23 or less.

32. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_dIs 1.99 or more; abbe number v_dIs 21 or less.

33. The high-refractive-index and high-dispersion optical glass according to any one of claims 1 to 4, wherein the refractive index n of the high-refractive-index and high-dispersion optical glass_d1.99 to 2.0735; abbe number v_dIs 18.47 to 21.

34. High-refractive high-dispersive optical glass according to claim 1 or 2, characterised in that it has a stability D against acid action_AIs more than 2 types; and/or stability against water action D_WIs more than 2 types; and/or the weather resistance CR is of class 2 or more; and/or coefficient of thermal expansion alpha_-30/70℃Is 110 x 10^-7below/K; and/or transition temperature T_gBelow 520 ℃; and/or degree of wear F_AIs 390 or less; and/or Knoop hardness H_KIs 350X 10⁷Pa is above; and/or lambda₇₀Is below 485 nm; and/or lambda₅Is 425nm or less.

35. High-refractive-index, high-dispersive optical glass according to claim 3 or 4, characterized in that said high-refractive-index, high-dispersive optical glassStability of acid resistance of the student glass D_AIs more than 2 types; and/or stability against water action D_WIs more than 2 types; and/or the weather resistance CR is of class 2 or more; and/or coefficient of thermal expansion alpha_-30/70℃Is 110 x 10^-7below/K; and/or degree of wear F_AIs 390 or less; and/or Knoop hardness H_KIs 350X 10⁷Pa is above; and/or lambda₇₀Is below 485 nm; and/or lambda₅Is 425nm or less.

36. The high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein the high-refractive-index, high-dispersion optical glass has an acid-resistance stability D_AIs of type 1; and/or stability against water action D_WIs of type 1; and/or the weatherability CR is of type 1; and/or coefficient of thermal expansion alpha_-30/70℃Is 100 x 10^-7below/K; and/or transition temperature T_gBelow 510 ℃; and/or degree of wear F_AIs 380 or less; and/or Knoop hardness H_KIs 360 multiplied by 10⁷Pa is above; and/or lambda₇₀Is less than 480 nm; and/or lambda₅Is 420nm or less.

37. A high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein the high-refractive-index, high-dispersion optical glass has a coefficient of thermal expansion α_-30/70℃Is 90X 10^-7below/K; and/or transition temperature T_gBelow 500 ℃; and/or degree of wear F_AIs less than 360; and/or Knoop hardness H_KIs 370X 10⁷Pa is above; and/or lambda₇₀Is below 470 nm; and/or lambda₅Is 410nm or less.

38. A high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 4, wherein the transition temperature T of the high-refractive-index, high-dispersion optical glass_gBelow 495 ℃; and/or a Knoop hardness of 380X 10⁷Pa or above.

39. A glass preform characterized by being made of the high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 38.

40. An optical element produced from the high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 38 or the glass preform according to claim 39.

41. An optical device comprising the high-refractive-index, high-dispersion optical glass according to any one of claims 1 to 38 and/or comprising the optical element according to claim 40.