Optical glass, optical element, and optical instrument

Abstract

To provide optical glass having relatively low ΔPC,s and ΔPC,t values and exhibiting excellent weather resistance.SOLUTION: Provided is optical glass, wherein the components of the optical glass are expressed in mol%, the cations comprise P5+: 26 to 45%, Al3+: 5 to 25%, and R2+: 28 to 60%, and the anions comprise F- and O2-, wherein F-+O2- is 98% or more, (P5++Al3+) / F- is 0.9 to 4.0, and R2+ is the total content of Ba2+, Sr2+, Ca2+, and Mg2+. By means of rational component design, the optical glass obtained by the present invention has a desired refractive index and Abbe number, and also has a low ΔPC,s value and ΔPC,t value, and excellent weather resistance.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to optical glass, and more particularly to optical glass having a refractive index of 1.57 to 1.66 and an Abbe number of 56 to 65, and to a glass preform, optical element and optical instrument produced from the same. [Background technology]

[0002] In recent years, optical lenses have been widely applied in fields such as vehicle-mounted imaging and surveillance security. In night imaging, lenses absorb near-infrared light in night black-and-white mode, and near-infrared light and visible light are focused at different focal lengths when passing through the lens, resulting in degradation of imaging quality. This poses a challenge to optical design in fields such as vehicle-mounted imaging, surveillance security, and even telescopes and gun sights.

[0003] The refractive index of glass decreases with increasing wavelength. Generally, the wavelength range available for nighttime near-infrared auxiliary lighting in imaging systems using visible light image sensors is 800-1000 nm. Research has shown that if the refractive index of glass decreases with increasing wavelength less than that of normal glass within this wavelength range, that is, if the glass forms a certain anomalous dispersion in the near-infrared band, it can significantly reduce the difficulty of achieving day-night confocal imaging through optical design and effectively improve nighttime imaging quality. The anomalous dispersion in the near-infrared band is ΔP C,s and ΔP C,t It is expressed using values.

[0004] Optical glasses with a refractive index of 1.57 to 1.66 and an Abbe number of 56 to 65 have suitable refractive indexes and Abbe numbers, and are widely used in various imaging systems. The ΔP of optical glasses with refractive indexes and Abbe numbers in this range in the prior art C,s and ΔP C,t The values are relatively large and cannot meet the needs of developing new imaging optical instruments. For example, patent application number 200780019054.0 discloses an optical glass with a refractive index of 1.55-1.65 and an Abbe number of 55-65.

[0005] On the other hand, optical systems that need to achieve day and night confocality are usually used in harsh environments, and the optical materials must have excellent weather resistance to ensure the reliability of the optical system. Therefore, ΔP C,s and ΔP C,t The development of optical glass with relatively low optical density and excellent weather resistance plays an important role in the development of the optical and electronic information field. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem that the present invention aims to solve is ΔP C,s and ΔP C,t The object of the present invention is to provide an optical glass having a relatively low value and excellent weather resistance. [Means for solving the problem]

[0007] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0008] (1) Optical glass, the composition of which is expressed in mole percent and which contains the following cations: P 5+ :26~45%;Al 3+ :5~25%;R 2+ :28~60%. F - and O 2- containing the anion F - +O 2- is more than 98%, (P 5+ +Al 3+ ) / F - is 0.9 to 4.0, and the R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+ The total content is

[0009] (2) The optical glass according to (1), further containing the following cations, expressed in mole percent: La 3+ +Gd 3+ +Y3+ : 0 to 20%, and / or Nb 5+ +W 6+ +Ti 4+ :0 to 15%, and / or Rn + : 0 to 10%, and / or Yb 3+ : 0 to 10% and / or Zn 2+ :0 to 10%, and / or B 3+ : 0 to 10%, and / or Si 4+ : 0 to 5%, and / or Ta 5+ : 0 to 10% and / or Sb 3+ : 0 to 1% and / or Sn 4+ : 0 to 1%, and / or Ce 4+ : 0 to 1%, and the Rn + Li + , Na + , K. + It is one or more of the following.

[0010] (3) Optical glass, the composition of which is expressed in mole percent and which contains the following cations: P 5+ :26~45%;La 3+ +Gd 3+ +Y 3+ :0~20%;Al 3+ :5~25%;R 2+ :28~60%;Nb 5+ +W 6+ +Ti 4+ :0~15%; Rn + :0~10%; Yb 3+ : 0~10%; Zn 2+ :0~10%;B 3+ : 0~10%; Si 4+ :0~5%;Ta 5+ :0~10%; Sb 3+ :0~1%; Sn 4+ :0~1%; Ce 4+ :0~1%; F - and O 2- containing the anion F - +O 2- is 98% or more, and the R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+is the total content of Rn + Li + , Na + , K. + It is one or more of the following.

[0011] (4) The cation of the component is P 5+ And Al 3+ and R 2+ and the anion is F - and O 2- and the refractive index n of the optical glass d is 1.57~1.66, Abbe number ν d is 56~65, ΔP C,s Value is 0 or less, ΔP C,t The value is -0.01 or less, optical glass.

[0012] (5) The optical glass according to (4), wherein the components are expressed in mole percent and the glass contains the following cations: P 5+ :26~45%, La 3+ +Gd 3+ +Y 3+ : 0 to 20%, Al 3+ :5~25%, R 2+ : 28~60%, Nb 5+ +W 6+ +Ti 4+ :0~15%, Rn + :0~10%, Yb 3+ : 0-10%, Zn 2+ :0~10%, B 3+ : 0 to 10%, Si 4+ : 0 to 5%, Ta 5+ :0-10%, Sb 3+ : 0~1%, Sn 4+ : 0 to 1%, Ce 4+ : 0 to 1%, and the R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+ is the total content of Rn + Li + , Na + , K. + It is one or more of the following.

[0013] (6) The optical glass according to any one of (1) to (5), containing the following components in mol %: (P 5+ +Al 3+ ) / F - is 0.9 to 4.0, and preferably (P 5+ +Al 3+ ) / F - is 1.0 to 3.5, more preferably (P 5+ +Al 3+ ) / F - is 1.2 to 3.0, more preferably (P 5+ +Al 3+ ) / F - is 1.5 to 2.5.

[0014] (7) The optical glass according to any one of (1) to (5), containing the following components in mol %: (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.1 to 10.0, preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.2 to 6.0, more preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.5 to 4.0, more preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.7 to 2.0.

[0015] (8) An optical glass according to any one of (1) to (5), containing the following component in mol %: Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.3 to 1.0, and preferably Y 3+ / (La3+ +Gd 3+ +Y 3+ ) is 0.5 to 1.0, more preferably Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.6 to 1.0, and more preferably Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.65 to 1.0.

[0016] (9) The optical glass according to any one of (1) to (5), containing the following components in mol %: Mg 2+ / Ba 2+ is 0.01 to 0.3, preferably Mg 2+ / Ba 2+ is 0.02 to 0.25, more preferably Mg 2+ / Ba 2+ is 0.03 to 0.2, more preferably Mg 2+ / Ba 2+ is 0.05 to 0.15.

[0017] (10) The optical glass according to any one of (1) to (5), containing the following components in mol %: Sr 2+ / Y 3+ is 0.3 to 10.0, preferably Sr 2+ / Y 3+ is 0.5 to 5.0, more preferably Sr 2+ / Y 3+ is 0.8 to 3.0, more preferably Sr 2+ / Y 3+ is 1.0 to 2.0.

[0018] (11) The optical glass according to any one of (1) to (5), containing the following components in mol %: (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 2.0 or less, preferably (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+) is 1.0 or less, more preferably (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 0.8 or less, and more preferably (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is less than or equal to 0.5.

[0019] (12) The optical glass according to any one of (1) to (5), containing the following components in mol %: (Rn + +Ca 2+ ) / Mg 2+ is 2.0 or less, preferably (Rn + +Ca 2+ ) / Mg 2+ is 1.0 or less, more preferably (Rn + +Ca 2+ ) / Mg 2+ is 0.8 or less, more preferably (Rn + +Ca 2+ ) / Mg 2+ is less than or equal to 0.5.

[0020] (13) The optical glass according to any one of (1) to (5), containing the following components in mol %: F - / O 2- is 0.18 to 0.6, preferably F - / O 2- is 0.2 to 0.5, more preferably F - / O 2- is 0.25 to 0.45, more preferably F - / O 2- is 0.28 to 0.4.

[0021] (14) An optical glass according to any one of (1) to (5), containing the following component in mol %: F - / Ba 2+ is 0.35 to 1.2, preferably F - / Ba 2+ is 0.5 to 1.1, more preferably F - / Ba 2+is 0.6 to 1.0, more preferably F - / Ba 2+ is 0.65 to 0.9.

[0022] (15) An optical glass according to any one of (1) to (5), containing the following components in mol %: P 5+ : 30 to 40%, preferably P 5+ : 33-38%, and / or La 3+ +Gd 3+ +Y 3+ : 0.1 to 15%, preferably La 3+ +Gd 3+ +Y 3+ : 0.5 to 12%, more preferably La 3+ +Gd 3+ +Y 3+ : 1 to 10%, and / or Nb 5+ +W 6+ +Ti 4+ : 0.5 to 10%, preferably Nb 5+ +W 6+ +Ti 4+ : 1 to 8%, and / or R 2+ : 35 to 55%, preferably R 2+ : 38 to 50%, and / or Al 3+ : 8 to 20%, preferably Al 3+ :10-18% and / or Rn + : 0 to 5%, preferably Rn + : 0 to 2%, more preferably Rn + and / or Yb 3+ : 0 to 5%, preferably Yb 3+ : 0 to 2%, more preferably Yb 3+ and / or Zn 2+ : 0 to 5%, preferably Zn 2+ : 0 to 2%, more preferably Zn 2+ does not contain and / or B 3+ : 0 to 5%, preferably B 3+ : 0 to 2%, more preferably B 3+ Does not contain and / or Si 4+ : 0 to 2%, preferably Si 4+ : 0 to 1%, more preferably Si 4+ Does not contain and / or Ta5+ : 0 to 5%, preferably Ta 5+ : 0 to 2%, more preferably Ta 5+ Does not contain and / or Sb 3+ : 0 to 0.5%, preferably Sb 3+ : 0 to 0.1% and / or Sn 4+ : 0 to 0.5%, preferably Sn 4+ : 0 to 0.1%, more preferably Sn 4+ Does not contain and / or Ce 4+ : 0 to 0.5%, preferably Ce 4+ : 0 to 0.1%, more preferably Ce 4+ The point is that it does not include

[0023] (16) The optical glass according to any one of (1) to (5), containing the following components in mol %: Ba 2+ : 28 to 45%, preferably Ba 2+ : 30 to 40%, more preferably Ba 2+ : 33-38%, and / or Sr 2+ : 0 to 10%, preferably Sr 2+ : 1 to 8%, more preferably Sr 2+ : 2 to 7%, and / or Mg 2+ : 0 to 10%, preferably Mg 2+ : 1 to 7%, more preferably Mg 2+ : 2 to 6%, and / or Ca 2+ : 0 to 10%, preferably Ca 2+ : 0 to 6%, more preferably Ca 2+ : 0 to 5%, and / or La 3+ : 0 to 10%, preferably La 3+ : 0 to 5%, more preferably La 3+ : 0 to 3%, and / or Gd 3+ : 0 to 10%, preferably Gd 3+ : 0 to 5%, more preferably Gd 3+ :0 to 3%, and / or Y 3+ : 0 to 10%, preferably Y 3+ : 0.5 to 8%, more preferably Y 3+ : 1 to 7%, and / or Nb 5+ : 0 to 10%, preferably Nb 5+: 0 to 6%, more preferably Nb 5+ : 0 to 4%, and / or W 6+ : 0 to 10%, preferably W 6+ : 0 to 6%, more preferably W 6+ : 0 to 5% and / or Ti 4+ : 0 to 10%, preferably Ti 4+ 0 to 5%, more preferably Ti 4+ 0 to 2%, more preferably Ti 4+ The point is that it does not include

[0024] (17) An optical glass according to any one of (1) to (5), containing the following components in mol %: F - : 15 to 45%, preferably F - : 18 to 38%, more preferably F - : 21-35%, and / or O 2- : 55 to 85%, preferably O 2- : 62 to 82%, more preferably O 2- :65~79%.

[0025] (18) Components expressed in mole percent and further including the following anions: Cl - :0-2% and / or Br - :0-2%, and / or I - : 0 to 2%, preferably further containing the following anions: Cl - :0 to 1%, and / or Br - :0 to 1%, and / or I - : 0 to 1%, more preferably further containing the following anions: Cl - : 0 to 0.5%, and / or Br - : 0 to 0.5%, and / or I - : 0 to 0.5%, the optical glass according to any one of (1) to (5).

[0026] (19) The refractive index n of the optical glass d is 1.57 to 1.66, preferably the refractive index n d is 1.58 to 1.64, more preferably the refractive index n d is 1.60~1.63, Abbe number ν dis 56 to 65, and preferably the Abbe number ν d is 58 to 63, and more preferably, the Abbe number ν d The optical glass according to any one of (1) to (5), wherein the value of the refractive index is 59 to 62.

[0027] (20) ΔP of the optical glass C,s The value is 0 or less, preferably ΔP C,s Value is -0.01 or less, more preferably ΔP C,s The value is -0.015 or less, and more preferably ΔP C,s Values less than or equal to -0.02 and / or ΔP C,t The value is -0.01 or less, preferably ΔP C,t A value of -0.02 or less is preferable, and ΔP C,t The value is -0.03 or less, and more preferably ΔP C,t A value of -0.04 or less, and even more preferably ΔP C,t The optical glass according to any one of (1) to (5), wherein the value is −0.05 or less.

[0028] (21) Water resistance stability D of the optical glass W is Class 3 or higher, preferably water resistance D W Class 2 or higher and / or acid resistance D A is Class 3 or higher, preferably acid resistance D A is Class 2 or more, and / or weather resistance CR is Class 2 or more, preferably weather resistance CR is Class 1, and / or transition temperature T g is 620°C or less, preferably the transition temperature T g is 610°C or less, more preferably the transition temperature T g is 600°C or less, and / or density ρ is 4.60 g / cm 3 Preferably, the density ρ is 4.50 g / cm or less. 3 More preferably, the density ρ is 4.40 g / cm or less. 3 Below, and / or λ 80 is 380 nm or less, preferably λ 80 is 375 nm or less, more preferably λ 80The optical glass according to any one of (1) to (5), wherein λ5 is 370 nm or less, and / or λ5 is 330 nm or less, preferably λ5 is 325 nm or less, and more preferably λ5 is 320 nm or less.

[0029] (22) A glass preform produced from the optical glass according to any one of (1) to (21).

[0030] (23) An optical element produced from the optical glass according to any one of (1) to (21) or the glass preform according to (22).

[0031] (24) An optical instrument comprising the optical glass according to any one of (1) to (21) and / or the optical element according to (23). [Effects of the Invention]

[0032] The beneficial effects of the present invention are as follows: By rationally designing the components, the optical glass obtained by the present invention has the desired refractive index and Abbe number, and at the same time, ΔP C,s value and ΔP C,t The value is relatively low and the weather resistance is excellent. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, embodiments of the optical glass according to the present invention will be described in detail, but the present invention is not limited to the embodiments described below, and can be practiced by appropriate modifications within the scope of the object of the present invention. Furthermore, although some omissions may be made, the gist of the present invention is not limited by repetition of the description, and hereinafter the optical glass of the present invention may also be referred to simply as glass.

[0034] <Optical glass> The range of each component constituting the optical glass of the present invention will be explained below. In this specification, unless otherwise specified, the content of a cation component is expressed as the molar percentage (mol%) of the cation relative to the total cation components, the content of an anion component is expressed as the molar percentage (mol%) of the anion relative to the total anion components, the ratio between the contents of cation components is the molar percentage content ratio between the contents of each cation component, the ratio between the contents of anion components is the molar percentage content ratio between the contents of each anion component, and the ratio between the contents of anion-cation components is the ratio of the molar percentage content of the cation component in the total cation components to the molar percentage content of the anion component in the total anion components.

[0035] Specifically, the numerical ranges set forth herein include upper and lower limits, and the terms "greater than or equal to" and "less than or equal to" include the endpoints, and all integers and fractions subsumed within the range, but are not limited to the specific values set forth when the range is limited. References herein to "and / or" are inclusive, e.g., "A and / or B" means A only, B only, or both A and B.

[0036] The ionic valence of each component explained below is a representative value used for convenience, and is not distinguished from other ionic valences. The ionic valence of each component of optical glass may be other than the representative value. For example, P is usually present in glass in a +5 ionic valence state, so in this patent, it is referred to as "P 5+ " is a representative value, but other ionic valence states may exist, which are also covered by this patent.

[0037] <Cationic components> P 5+ is a glass network former, which enhances the stability of the glass and reduces the △P of the glass. C,t Value and △P C,s However, if the content is less than 26%, the above-mentioned effect is not obvious, the stability of the glass is reduced, and the crystallization tendency is increased. 5+The content of P is 26% or more, preferably 30% or more, and more preferably 33% or more. 5+ If the content of P exceeds 45%, the weather resistance of the glass decreases, making it difficult to obtain the desired optical constants of the present invention. 5+ In some embodiments, the P content is about 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, or 45%. 5+ may include:

[0038] Al 3+ Al is a framework component of the glass of the present invention, and can effectively improve the mechanical properties and weather resistance of the glass while simultaneously lowering the thermal expansion coefficient of the glass. However, if its content is less than 5%, a stable glass framework is not formed and the above-mentioned effects cannot be achieved. 3+ If the content of Al exceeds 25%, the glass transition temperature and liquidus temperature rise, making it difficult to melt the glass, and at the same time, the forming temperature rises, glass volatilization becomes severe, glass stripes become poor, and press forming becomes difficult due to the high transition temperature. Therefore, in the present invention, 3+ In some embodiments, the Al content is 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%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, or 25%. 3+may include:

[0039] La 3+ can increase the refractive index of glass and improve its acid resistance, but La 3+ If the content of La is too high, the thermal stability and devitrification resistance of the glass decrease, and the glass becomes more susceptible to devitrification during production. 3+ In some embodiments, the content of La is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. 3+ may include:

[0040] Gd 3+ Although Gd can improve the chemical stability of glass and increase the refractive index, if its content exceeds 10%, the glass transition temperature increases and the stability decreases. 3+ In some embodiments, the content of Gd is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. 3+ may include:

[0041] Y 3+ It has a high refractive index, low dispersion, improves the abrasion resistance of the glass, and reduces the △P of the glass. C,t Value and △P C,s However, if the content exceeds 10%, the glass tends to devitrify. 3+ The content of Y is 10% or less, preferably 0.5 to 8%, and more preferably 1 to 7%. In some embodiments, the content of Y is about 0%, more than 0%, 0.1%, 0.5%, 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%, or 10%.3+ may include:

[0042] In some embodiments of the present invention, La 3+ , Gd 3+ , Y 3+ The total content of La 3+ +Gd 3+ +Y 3+ By controlling La to 20% or less, the optical constants of the glass can be prevented from exceeding the design requirements. 3+ +Gd 3+ +Y 3+ is 20% or less. 3+ , Gd 3+ , Y 3+ The total content of La 3+ +Gd 3+ +Y 3+ By setting the content of La in the range of 0.1 to 15%, it is easy to obtain the desired optical constants and at the same time, the chemical stability of the glass can be improved. Therefore, it is more preferable to set the content of La in the range of 0.1 to 15%. 3+ +Gd 3+ +Y 3+ is 0.1 to 15%, and more preferably La 3+ +Gd 3+ +Y 3+ is 0.5 to 12%, and even more preferably La 3+ +Gd 3+ +Y 3+ In some embodiments, La 3+ +Gd 3+ +Y 3+ can be 0%, greater than 0%, 0.1%, 0.5%, 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%, 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%, or 20%.

[0043] In some embodiments of the present invention, Y 3+ / (La 3+ +Gd 3+ +Y3+ By controlling Y to be within the range of 0.3 to 1.0, the weather resistance of the glass can be optimized and the light transmittance of the glass can be increased. 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.3 to 1.0, more preferably Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.5 to 1.0, and more preferably Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.6 to 1.0, and even more preferably Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.65 to 1.0. In some embodiments, Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) can have values of 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.

[0044] Yb 3+ Although Yb can increase the refractive index of the glass, if its content is too high, the thermal stability and devitrification resistance of the glass decrease. 3+ The content of is 10% or less, preferably 5% or less, more preferably 2% or less, and further preferably Yb 3+ In some embodiments, the compound is free of about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10% Yb. 3+ may include:

[0045] W 6+ increases the refractive index and dispersion of the glass, and the glass transition temperature, △P C,t Value and △P C,sHowever, if its content exceeds 10%, the coloring degree of the glass will be poor, the refractive index will easily exceed the design requirement, and the abrasion resistance will be poor. 6+ In some embodiments, the content of W is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. 6+ may include:

[0046] Nb 5+ increases the refractive index and dispersion of the glass, and the △P C,t and △P C,s However, if its content exceeds 10%, the devitrification resistance of the glass decreases and the coloring degree deteriorates. 5+ In some embodiments, the Nb content is about 0%, more than 0%, 0.1%, 0.5%, 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%, or 10%. 5+ may include:

[0047] Ti 4+ improves the chemical stability of the glass and increases the △P C,t and △P C,s However, if the content is too high, the crystallization tendency of the glass increases, the coloring degree deteriorates, and the melting property of the glass decreases. 4+ The content of Ti is 10% or less, preferably 5% or less, and more preferably 2% or less. 4+ In some embodiments, the Ti content is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%.4+ may include:

[0048] In some embodiments of the present invention, Nb 5+ , W 6+ and Ti 4+ The total content of Nb 5+ +W 6+ +Ti 4+ By making the content of Nb 15% or less, the refractive index and Abbe number of the glass exceed the design requirements, and it is possible to prevent the deterioration of devitrification resistance and the deterioration of coloring. 5+ +W 6+ +Ti 4+ is 15% or less. 5+ +W 6+ +Ti 4+ By making the content of glass 0.5% or more, the △P C,t Value and △P C,s Therefore, Nb is more preferable. 5+ +W 6+ +Ti 4+ is 0.5 to 10%, more preferably Nb 5+ +W 6+ +Ti 4+ In some embodiments, Nb 5+ +W 6+ +Ti 4+ can be 0%, greater than 0%, 0.1%, 0.5%, 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%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, or 15%.

[0049] As a result of extensive experimental work by the inventors, in some embodiments of the present invention, Nb 5+ , W 6+ and Ti 4+ The total content of Nb 5+ +W 6+ +Ti 4+ And, La 3+ , Gd 3+ and Y 3+ The total content of La 3+ +Gd3+ +Y 3+ Ratio to (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) to 0.1 to 10.0, the optical constants of the glass are kept within the desired range, and at the same time, the △P C,t Value and △P C,s It has been found that the value of Nb can be reduced and the chemical stability of the glass can be optimized. 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.1 to 10.0, more preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.2 to 6.0, more preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.5 to 4.0, and even more preferably (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.7 to 2.0. In some embodiments, (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+) values are 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, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1. It can be 3, 2.5, 2.7, 3.0, 3.3, 3.5, 3.7, 4.0, 4.3, 4.5, 4.7, 5.0, 5.3, 5.5, 5.7, 6.0, 6.3, 6.5, 6.7, 7.0, 7.3, 7.5, 7.7, 8.0, 8.3, 8.5, 8.7, 9.0, 9.3, 9.5, 9.7, 10.0.

[0050] In the present invention, 28 to 60% of the alkaline earth metal component R 2+ (R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+ The addition of R (total content of R) improves the thermal stability of the glass and adjusts the optical constants of the glass. 2+ The content of is 35 to 55%, more preferably R 2+ In some embodiments, the content is about 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 50%, 51%, 51.5%, 52%, 52.5%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%, 106%, 107%, 108%, 109%, 110%, 111%, 112%, 113%, 114%, 1 .5%, 44%, 44.5%, 45%, 45.5%, 46%, 46.5%, 47%, 47.5%, 48%, 48.5%, 49%, 49.5%, 50%, 50.5%, 51%, 51.5%, 52%, 52.5%, 53%, 53.5%, 54%, 54.5%, 55%, 55.5%, 56%, 56.5%, 57%, 57.5%, 58%, 58.5%, 59%, 59.5%, 60% R 2+ may include:

[0051] Ba 2+ Ba can increase the refractive index, thermal stability and weather resistance of the glass. In the present invention, Ba is used in an amount of 28% or more. 2+The above effect can be obtained by adding Ba. 2+ If the content of Ba exceeds 45%, the glass transition temperature and density increase, and the abrasion resistance deteriorates. 2+ In some embodiments, the Ba content is about 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40%, 40.5%, 41%, 41.5%, 42%, 42.5%, 43%, 43.5%, 44%, 44.5%, or 45%. 2+ may include:

[0052] Sr 2+ Sr can reduce the thermal expansion coefficient of the glass and effectively adjust the refractive index and density of the glass, but if its content is too high, the devitrification resistance and chemical stability of the glass will decrease. 2+ In some embodiments, the Sr content is about 0%, more than 0%, 0.1%, 0.5%, 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%, or 10%. 2+ may include:

[0053] In some embodiments of the present invention, Sr 2+ and Y 3+ Relative content of Sr 2+ / Y 3+ By controlling the value of Sr within the range of 0.3 to 10.0, the glass transition temperature and density can be lowered. 2+ / Y 3+ is 0.3 to 10.0, more preferably Sr 2+ / Y 3+ is 0.5 to 5.0. 2+ / Y 3+By setting Sr in the range of 0.8 to 3.0, the crystallization resistance of the glass can be further improved. 2+ / Y 3+ is 0.8 to 3.0, and even more preferably Sr 2+ / Y 3+ is 1.0 to 2.0. In some embodiments, Sr 2+ / Y 3+ The values of can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.3, 3.5, 3.7, 4.0, 4.3, 4.5, 4.7, 5.0, 5.3, 5.5, 5.7, 6.0, 6.3, 6.5, 6.7, 7.0, 7.3, 7.5, 7.7, 8.0, 8.3, 8.5, 8.7, 9.0, 9.3, 9.5, 9.7, 10.0.

[0054] Mg 2+ Although Mg can improve the abrasion resistance and devitrification resistance of the glass, if its content exceeds 10%, the stability of the glass decreases. 2+ In some embodiments, the content of Mg is about 0%, more than 0%, 0.1%, 0.5%, 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%, or 10%. 2+ may include:

[0055] In some embodiments of the present invention, Mg 2+ and Ba 2+ The ratio of Mg content to 2+ / Ba 2+ By setting the content of Mg in the range of 0.01 to 0.3, the abrasion resistance of the glass can be optimized and the chemical stability of the glass can be improved. 2+ / Ba 2+ is 0.01 to 0.3, more preferably Mg 2+ / Ba 2+is 0.02 to 0.25, more preferably Mg 2+ / Ba 2+ is 0.03 to 0.2, and even more preferably Mg 2+ / Ba 2+ In some embodiments, Mg 2+ / Ba 2+ The values of can be 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.

[0056] Ca 2+ Ba can enhance the chemical stability of glass and improve the polishing performance of glass. 2+ However, if the content is too high, the devitrification resistance of the glass deteriorates. 2+ In some embodiments, the content of Ca is about 0%, more than 0%, 0.1%, 0.5%, 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%, or 10%. 2+ may include:

[0057] Rn + (Rn + Li + , Na + , K. + Rn can lower the glass transition temperature and refractive index and improve the press workability of the glass, but if its content is too high, the stability and weather resistance of the glass will decrease. + In some embodiments, the content of Rn is preferably 10% or less, more preferably 5% or less, and even more preferably 2% or less. +In some embodiments, the Rn content is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. + may include:

[0058] The present invention is the result of extensive experimental work, and in some embodiments, + +Ca 2+ ) / Mg 2+ By controlling the value to 2.0 or less, the density of the glass, △P C,t Value and △P C,s It has been found that the value can be reduced and the abrasion degree of the glass can be optimized. Therefore, it is preferable to use (Rn + +Ca 2+ ) / Mg 2+ is 2.0 or less, more preferably (Rn + +Ca 2+ ) / Mg 2+ is 1.0 or less, more preferably (Rn + +Ca 2+ ) / Mg 2+ is 0.8 or less, and even more preferably (Rn + +Ca 2+ ) / Mg 2+ is 0.5 or less. In some embodiments, (Rn + +Ca 2+ ) / Mg 2+ The value of can be 0, >0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0.

[0059] Zn 2+ Although Zn can lower the glass transition temperature and increase the thermal stability of the glass, if its content exceeds 10%, the dispersion of the glass increases, making it difficult to obtain the desired optical constants and reducing the devitrification resistance of the glass. 2+ The content of Zn is limited to 10% or less, preferably 5% or less, and more preferably 2% or less. In some embodiments, it is even more preferable to2+ In some embodiments, the amount of Zn is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. 2+ may include:

[0060] The present invention is the result of extensive experimental work, and in some embodiments, 2+ and Zn 2+ Total content of Ca 2+ +Zn 2+ and Nb 5+ , W 6+ , Ti 4+ The total content of Nb 5+ +W 6+ +Ti 4+ Ratio to (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) to 2.0 or less, the glass has a lower △P C,t Value and △P C,s At the same time as obtaining the value, the crystallization resistance of the glass can be optimized. Therefore, it is preferable to 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 2.0 or less, more preferably (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 1.0 or less. 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ By making (Ca) 0.8 or less, the degree of bubbles in the glass can be further optimized and the thermal expansion coefficient of the glass can be reduced. Therefore, it is more preferable to make (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+) is 0.8 or less, and even more preferably (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 0.5 or less. In some embodiments, (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) can have a value of 0, >0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0.

[0061] Si 4+ Although Si can improve the devitrification resistance of the glass, reduce the abrasion resistance of the glass, and improve the processability, if its content exceeds 5%, the melting performance of the glass will decrease. 4+ The content of is 5% or less, preferably 2%, more preferably 1% or less, and further preferably Si 4+ In some embodiments, the content of Si is about 0%, greater than 0%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%. 4+ may include:

[0062] B 3+ can improve the devitrification resistance of the glass, but in optical glasses containing fluorine, it volatilizes to a high degree when the glass is melted, making the optical constants of the glass unstable and causing stripes. 3+ The content of is limited to 10% or less, preferably 5% or less, more preferably 2% or less, and even more preferably B 3+ In some embodiments, the B content is about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10%. 3+ may include:

[0063] Ta5+ Although Ta can increase the refractive index of glass, if its content is high, the glass is prone to devitrification. 5+ The content of is 10% or less, preferably 5% or less, more preferably 2% or less, and ΔP of the glass C,t Value and △P C,s More preferably, Ta 5+ In some embodiments, the composition is free of about 0%, greater than 0%, 0.1%, 0.5%, 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%, or 10% Ta. 5+ may include:

[0064] The glass of the present invention contains Sb 3+ , Sn 4+ , Ce 4+ One or more of the above components may be contained as a fining agent. 3+ If the Sb content exceeds 1%, the clarity of the glass tends to decrease, and at the same time, its strong oxidizing effect accelerates deterioration of the molding die. 3+ The content of Sn is 1% or less, preferably 0.5% or less, and more preferably 0.1% or less. 4+ Sn can be used as a fining agent, but if its content exceeds 1%, the glass will become colored, and when the glass is heated, softened, and reshaped by pressing or other processes, Sn 4+ Therefore, the Sn of the present invention tends to be the starting point of crystal nucleation and devitrification. 4+ The content of is 1% or less, preferably 0.5% or less, more preferably 0.1% or less, and further preferably Sn 4+ It does not contain Ce 4+ The effect and content of Sn 4+ The content is equal to or less than 1%, preferably equal to or less than 0.5%, more preferably equal to or less than 0.1%, and further preferably equal to or less than Ce. 4+In some embodiments, the concentration of Sb is about 0%, greater than 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or less. 3+ Japanese / Sn 4+ Japanese / Ce 4+ may include:

[0065] <Anion component> In the glass of the present invention, F - and O 2- The total content of F - +O 2- By increasing the glass density to 98% or more, the glass has excellent stability and the △P C,t and △P C,s The value can be reduced, preferably F - +O 2- is 98.5% or more, more preferably F - +O 2- is 99% or more, and more preferably F - +O 2- In some embodiments, F - +O 2- can be 98%, 98.1%, 98.2%, 98.3%, 98.4%, 98.5%, 98.6%, 98.7%, 98.8%, 98.9%, 99%, 99.1%, 99.2%, 99.3%, 99.4%, 99.5%, 99.6%, 99.7%, 99.8%, 99.9%, 100%.

[0066] F - has obvious effect on reducing the refractive index temperature coefficient and transition temperature of glass, and increasing the Abbe number, △P C,t Value and △P C,s If its content is less than 15%, the above effect is not obvious. Therefore, it is preferable to use F - The content of is 18% or more, more preferably F - The content of F is 21% or more. -If the content of fluorine is too high, the refractive index of the glass will decrease, the stability of the glass will decrease, and the thermal expansion coefficient of the glass will increase. In particular, the volatilization of fluorine during melting will pollute the environment and cause the internal composition of the glass to become non-uniform. Therefore, the F content in the present invention is - In some embodiments, the content of F is limited to about 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, or 45%. - may include:

[0067] The optical glass of the present invention is O 2- In particular, it contains 55% or more of O 2- By adding O, the stability and weather resistance of the glass can be improved, and the deterioration of the glass abrasion rate and the deterioration of stripes can be suppressed. 2- By controlling the content of O to 85% or less, it is possible to prevent the viscosity and melting temperature of the glass from increasing at high temperatures. 2- In some embodiments, the O content is about 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, or 85%. 2- may include:

[0068] In the present invention, 2% or less of Cl is used as a fining agent. - The defoaming effect of the glass can be improved by adding -In some embodiments, the content of Cl is about 0%, more 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%, or 2%. - may include:

[0069] In some embodiments of the present invention, F - and O 2- Relative content of F - / O 2- By controlling F to within the range of 0.18 to 0.6, the stability and thermal stability of the glass can be improved and the light transmittance of the glass can be optimized. - / O 2- is 0.18 to 0.6, more preferably F - / O 2- is 0.2 to 0.5, more preferably F - / O 2- is 0.25 to 0.45, and even more preferably F - / O 2- In some embodiments, F - / O 2- The values of can be 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, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6.

[0070] In some embodiments of the present invention, F - / Ba 2+ By keeping the value within the range of 0.35 to 1.2, the △P of the glass C,t Value and △P C,s Therefore, it is preferable to reduce the F- / Ba 2+ is 0.35 to 1.2, more preferably F - / Ba 2+ is 0.5 to 1.1, and more preferably F - / Ba 2+ is 0.6 to 1.0, and even more preferably F - / Ba 2+ is 0.65 to 0.9. In some embodiments, F - / Ba 2+ The values of are 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, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0. It can be 0.6, 0.61, 0.63, 0.65, 0.67, 0.7, 0.73, 0.75, 0.77, 0.8, 0.83, 0.85, 0.87, 0.9, 0.93, 0.95, 0.97, 1.0, 1.03, 1.05, 1.07, 1.1, 1.13, 1.15, 1.17, 1.2.

[0071] In some embodiments of the present invention, preferably (P 5+ +Al 3+ ) / F - is set in the range of 0.9 to 4.0, the devitrification resistance and weather resistance of the glass can be improved, and volatilization of fluorine can be suppressed. 5+ +Al 3+ ) / F - is 1.0 to 3.5, more preferably (P 5+ +Al 3+ ) / F - is 1.2 to 3.0, and even more preferably (P 5+ +Al 3+ ) / F - is 1.5 to 2.5. In some embodiments, (P 5+ +Al 3+ ) / F -The values of are 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, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.4 5, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3.0, 3.05, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.45, 3.5, 3.55, 3.6, 3.65, 3.7, 3.75, 3.8, 3.85, 3.9, 3.95, 4.0.

[0072] <Other ingredients> Zr may be added as needed within a range that does not impair the properties of the optical glass of the present invention. 4+ , Ge 4+ , Bi 3+ , Te 4+ , Br - , I - Other components such as Ta may be added to the optical glass of the present invention. 5+ , Ge 4+ , Bi 3+ , Te 4+ The total content or each content of Br is preferably 5% or less, more preferably 3% or less, even more preferably 1% or less, and even more preferably zero. - , I - The total content or each content of these is preferably 2% or less, more preferably 1% or less, even more preferably 0.5% or less, and even more preferably zero.

[0073] <Ingredients that should not be included> Components such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo, added alone or in combination in small amounts, tend to color the glass, cause absorption at specific wavelengths in the visible light region, and reduce the visible light transmittance improvement effect of the present invention. Therefore, optical glasses that are particularly required to have transmittance at wavelengths in the visible light region preferably do not actually contain any of the above components.

[0074] In recent years, there has been a trend toward restricting the use of As, Pb, Th, Cd, Tl, Os, Be, and Se components as harmful chemicals, making it necessary to address environmental protection issues not only in the glass manufacturing process but also in the processing and post-production processes. Therefore, when environmental impact is a major concern, it is preferable to avoid these components except for unavoidable contamination. This ensures that the optical glass does not contain substances that actually pollute the environment. Therefore, the optical glass of the present invention can be manufactured, processed, and disposed of without requiring special environmental measures.

[0075] The terms "free" and "0%" used in this specification mean that the corresponding component was not intentionally added as a raw material for the glass of the present invention. However, impurities or components that are not intentionally added as raw materials and / or equipment for manufacturing optical glass may exist in small or trace amounts in the final glass, and these are also covered by the patent of this invention.

[0076] The properties of the optical glass of the present invention will be described below.

[0077] <Refractive index and Abbe number> The refractive index of optical glass (n d ) and Abbe number (ν d ) has been tested according to the method specified in GB / T 7962.1-2010.

[0078] In some embodiments, the refractive index (n d ) is 1.57, preferably 1.58, and more preferably 1.60, and in some embodiments, the refractive index (nd ) has an upper limit of 1.66, preferably 1.64, and more preferably 1.63.

[0079] In some embodiments, the refractive index (n d ) can be 1.57, 1.575, 1.58, 1.585, 1.59, 1.595, 1.60, 1.605, 1.61, 1.615, 1.62, 1.625, 1.63, 1.635, 1.64, 1.645, 1.65, 1.655, 1.66.

[0080] In some embodiments, the Abbe number (ν d ) is 56, preferably 58, and more preferably 59, and in some embodiments, the Abbe number (ν d ) has an upper limit of 65, preferably 63, and more preferably 62.

[0081] In some embodiments, the Abbe number (ν d ) can be 56, 56.5, 57, 57.5, 58, 58.5, 59, 59.5, 60, 60.5, 61, 61.5, 62, 62.5, 63, 63.5, 64, 64.5, 65.

[0082] <Water resistance stability> Water resistance stability of optical glass (D W ) (powder method) is tested according to the method specified in GB / T 17129.

[0083] In some embodiments, the water resistance stability (D W ) is class 3 or more, preferably class 2 or more.

[0084] <Acid resistance stability> Acid resistance stability of optical glass (D A ) (powder method) is tested according to the method specified in GB / T 17129.

[0085] In some embodiments, the acid resistance stability (D A ) is class 3 or more, preferably class 2 or more.

[0086] <Weather resistance> The weather resistance (CR) of optical glass is tested according to the following method. The glass sample is placed in a test box with a saturated water vapor environment of 90% relative humidity, and the temperature is alternately circulated at 40-50°C every hour for 15 cycles. The type of weather resistance is classified according to the amount of change in turbidity before and after placing the sample in the test box. Table 1 is a list of weather resistance classifications.

[0087] [Table 1]

[0088] In some embodiments, the weather resistance (CR) of the optical glass of the present invention is Class 2 or higher, preferably Class 1.

[0089] <Transition temperature> Optical glass transition temperature (T g ) is tested according to the method specified in GB / T7962.16-2010.

[0090] In some embodiments, the transition temperature (T g ) is 620°C or less, preferably 610°C or less, and more preferably 600°C or less.

[0091] <density> The density (ρ) of optical glass is tested according to the method specified in GB / T7962.20-2010.

[0092] In some embodiments, the density (ρ) of the optical glass of the present invention is 4.60 g / cm 3 or less, preferably 4.50 g / cm 3 or less, more preferably 4.40 g / cm 3 The following is the result.

[0093] <Coloring degree> The short-wave transmission spectrum characteristics of the optical glass of the present invention are determined by the coloring degree (λ 80 / λ5). 80 λ is the wavelength corresponding to the glass transmittance reaching 80%, and λ5 is the wavelength corresponding to the glass transmittance reaching 5%. 80 is a measurement of the spectral transmittance in the wavelength range from 280 nm to 700 nm using a glass with a thickness of 10±0.1 mm having two optically polished flat surfaces parallel to each other, and indicates the wavelength at which the transmittance is 80%. The spectral transmittance or transmittance is the intensity I in The light with intensity I is incident on the glass and passes through it to the other plane. out When emitting light of I out / I in This quantity is expressed as: and includes the transmittance of the surface reflection losses on the surface of the glass. The higher the refractive index of the glass, the greater the surface reflection losses. Therefore, for high refractive index glasses, λ 80 The smaller the value, the less coloring there is in the glass itself.

[0094] In some embodiments, the λ 80 is 380 nm or less, preferably λ 80 is 375 nm or less, more preferably λ 80 is 370 nm or less.

[0095] In some embodiments, the optical glass of the present invention has a λ5 of 330 nm or less, preferably a λ5 of 325 nm or less, and more preferably a λ5 of 320 nm or less.

[0096] <ΔP C,s and ΔP C,t Value> ΔP of optical glass C,s and ΔP C,t The value is measured according to the method specified in GB / T 7962.1-2010. F , N C , N s , N t The value is measured and calculated using the following formula: P C,s=(n C -n s ) / (n F -n C ) ΔP C,s = P C,s -0.4017-0.002365ν d P C,t =(n C -n t ) / (n F -n C ) ΔP C,t = P C,t -0.5462-0.004713ν d

[0097] In some embodiments, the ΔP of the optical glass of the present invention C,s The value is 0 or less, preferably −0.01 or less, more preferably −0.015 or less, and even more preferably −0.02 or less.

[0098] In some embodiments, the ΔP of the optical glass of the present invention C,t The value is −0.01 or less, preferably −0.02 or less, more preferably −0.03 or less, even more preferably −0.04 or less, and even more preferably −0.05 or less.

[0099] <Manufacturing method> The method for producing the optical glass of the present invention is as follows: The glass of the present invention is produced using conventional raw materials and processes, such as carbonates, nitrates, sulfates, hydroxides, oxides, fluorides, phosphates, and metaphosphates, and is blended using conventional methods. The resulting furnace material is then placed in a melting furnace (e.g., a platinum crucible or platinum alloy crucible with a lid) at 850 to 1200°C and melted. The resulting mixture is then clarified and homogenized to obtain a homogeneous molten glass free of bubbles and unmelted material. This molten glass is then cast into a mold and annealed. Those skilled in the art will be able to select the appropriate raw materials, manufacturing methods, and process parameters according to actual needs.

[0100] <Glass preforms and optical elements> A glass preform can be produced from the produced optical glass using press molding means such as polishing, hot press molding, precision press molding, etc. That is, an optical preform can be produced from the optical glass by mechanical processing such as grinding or polishing, or a blank for press molding can be produced from the optical glass, and this blank can be hot press molded and then polished to produce an optical preform, or the polished blank can be precision press molded to produce an optical preform.

[0101] It should be noted that the means for producing the optical preform is not limited to the above-mentioned means. As described above, the optical glass of the present invention is useful for various optical elements and optical designs, and it is particularly preferable to form a blank from the optical glass of the present invention and use this blank to perform hot press molding, precision press molding, etc. to produce optical elements such as lenses and prisms.

[0102] The optical preform and optical element of the present invention are both formed from the optical glass of the present invention. The optical preform of the present invention has the excellent properties of optical glass, and the optical element of the present invention has the excellent properties of optical glass, making it possible to provide optical elements such as various lenses and prisms with high optical value.

[0103] Examples of lenses include 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, each having a spherical or aspherical lens surface.

[0104] <Optical equipment> Optical elements formed from the optical glass of the present invention can be used to fabricate optical equipment such as photographic devices, imaging devices, display devices and monitoring devices.

[0105] [Example] <Optical Glass Examples> To further clearly illustrate the technical solutions of the present invention, the following non-limiting examples are provided.

[0106] In the present examples, the above-described optical glass manufacturing method was used to obtain optical glasses having the components shown in Tables 2 to 4. The properties of each glass were measured using the test methods described in the present invention, and the results are shown in Tables 2 to 4.

[0107] [Table 2-1]

[0108] [Table 2-2]

[0109] [Table 3-1]

[0110] [Table 3-2]

[0111] [Table 4-1]

[0112] [Table 4-2]

[0113] <Example of glass preform> The glasses obtained in Tables 2 to 4 of the optical glass examples are subjected to polishing or press molding such as hot press molding or precision press molding to produce preforms of various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.

[0114] <Optical element examples> These preforms obtained in the glass preform examples above are annealed to fine-tune the refractive index while reducing the stress inside the glass so that the optical properties, such as the refractive index, reach the desired values.

[0115] Each preform is then ground and polished to produce various lenses and prisms, including concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses.Anti-reflection coatings can also be applied to the surfaces of the resulting optical elements.

[0116] <Optical equipment example> The optical elements manufactured according to the above optical element embodiments can be used in imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / illumination in the automotive field, photolithography technology, excimer lasers, wafers, computer chips and integrated circuits and electronic devices containing such circuits and chips, by using one or more optical elements according to optical design to form optical parts or components.

Claims

1. Optical glass containing the following cations, expressed in mole percent: 5+ : 26-45%; Al 3+ : 5-25%; R 2+ : 28-60%; F - and O 2- containing the anion F - +O 2- is more than 98%, (P 5+ +Al 3+ ) / F - is 0.9 to 4.0, and the R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+ The total content is

2. 2. The optical glass of claim 1, further comprising the following cations, expressed in mole percent: La 3+ +Gd 3+ +Y 3+ : 0 to 20%, and / or Nb 5+ +W 6+ +Ti 4+ : 0 to 15%, and / or Rn + : 0 to 10%, and / or Yb 3+ : 0 to 10% and / or Zn 2+ : 0-10%, and / or B 3+ : 0 to 10%, and / or Si 4+ : 0 to 5%, and / or Ta 5+ : 0 to 10%, and / or Sb 3+ : 0 to 1% and / or Sn 4+ : 0 to 1%, and / or Ce 4+ : 0 to 1%, and the Rn + Li + , Na + , K. + It is one or more of the following.

3. Optical glass containing the following cations, expressed in mole percent: 5+ : 26-45%; La 3+ +Gd 3+ +Y 3+ : 0-20%; Al 3+ : 5-25%; R 2+ : 28-60%; Nb 5+ +W 6+ +Ti 4+ : 0-15%; Rn + : 0-10%; Yb 3+ : 0-10%; Zn 2+ : 0-10%; B 3+ : 0-10%; Si 4+ : 0 to 5%; Ta 5+ : 0-10%; Sb 3+ : 0-1%; Sn 4+ : 0-1%; Ce 4+ : 0-1%; F - and O 2- containing the anion F - +O 2- is 98% or more, and the R 2+ Ba 2+ , Sr 2+ , Ca 2+ and Mg 2+ is the total content of Rn + Li + , Na + , K. + It is one or more of the following.

4. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: (P 5+ +Al 3+ ) / F - is 0.9 to 4.0, and / or F - / O 2- is 0.18 to 0.6, and / or F - / Ba 2+ is 0.35 to 1.2, and / or (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.1 to 10.0, and / or Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.3 to 1.0, and / or Mg 2+ / Ba 2+ is 0.01 to 0.3, and / or Sr 2+ / Y 3+ is 0.3 to 10.0, and / or (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 2.0 or less, and / or (Rn + +Ca 2+ ) / Mg 2+ is 2.0 or less.

5. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: (P 5+ +Al 3+ ) / F - is 1.0 to 3.5, and / or F - / O 2- is 0.2 to 0.5, and / or F - / Ba 2+ is 0.5 to 1.1, and / or (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.2 to 6.0, and / or Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.5 to 1.0, and / or Mg 2+ / Ba 2+ is 0.02 to 0.25, and / or Sr 2+ / Y 3+ is 0.5 to 5.0, and / or (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 1.0 or less, and / or (Rn + +Ca 2+ ) / Mg 2+ is less than or equal to 1.

0.

6. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: (P 5+ +Al 3+ ) / F - is 1.2 to 3.0, and / or F - / O 2- is 0.25 to 0.45, and / or F - / Ba 2+ is 0.6 to 1.0, and / or (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.5 to 4.0, and / or Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.6 to 1.0, and / or Mg 2+ / Ba 2+ is 0.03 to 0.2, and / or Sr 2+ / Y 3+ is 0.8 to 3.0, and / or (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 0.8 or less, and / or (Rn + +Ca 2+ ) / Mg 2+ is less than 0.

8.

7. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: (P 5+ +Al 3+ ) / F - is 1.5 to 2.5, and / or F - / O 2- is 0.28 to 0.4, and / or F - / Ba 2+ is 0.65 to 0.9, and / or (Nb 5+ +W 6+ +Ti 4+ ) / (La 3+ +Gd 3+ +Y 3+ ) is 0.7 to 2.0, and / or Y 3+ / (La 3+ +Gd 3+ +Y 3+ ) is 0.65 to 1.0, and / or Mg 2+ / Ba 2+ is 0.05 to 0.15, and / or Sr 2+ / Y 3+ is 1.0 to 2.0, and / or (Ca 2+ +Zn 2+ ) / (Nb 5+ +W 6+ +Ti 4+ ) is 0.5 or less, and / or (Rn + +Ca 2+ ) / Mg 2+ is less than or equal to 0.

5.

8. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: P 5+ : 30-40%, and / or La 3+ +Gd 3+ +Y 3+ : 0.1 to 15%, and / or Nb 5+ +W 6+ +Ti 4+ : 0.5 to 10%, and / or R 2+ : 35-55%, and / or Al 3+ : 8 to 20%, and / or Rn + : 0 to 5%, and / or Yb 3+ : 0 to 5% and / or Zn 2+ : 0-5%, and / or B 3+ : 0 to 5%, and / or Si 4+ : 0 to 2%, and / or Ta 5+ : 0 to 5% and / or Sb 3+ : 0 to 0.5% and / or Sn 4+ : 0 to 0.5%, and / or Ce 4+ : 0 to 0.5%.

9. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: P 5+ : 33-38%, and / or La 3+ +Gd 3+ +Y 3+ : 0.5 to 12%, and / or Nb 5+ +W 6+ +Ti 4+ : 1 to 8%, and / or R 2+ : 38-50%, and / or Al 3+ : 10-18%, and / or Rn + : 0 to 2%, and / or Yb 3+ : 0 to 2% and / or Zn 2+ : 0-2%, and / or B 3+ : 0 to 2%, and / or Si 4+ : 0 to 1%, and / or Ta 5+ : 0 to 2% and / or Sb 3+ : 0 to 0.1% and / or Sn 4+ : 0 to 0.1%, and / or Ce 4+ : 0 to 0.1%.

10. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: La 3+ +Gd 3+ +Y 3+ : 1 to 10%, and / or Rn + and / or Yb 3+ and / or Zn 2+ does not contain and / or B 3+ Does not contain and / or Si 4+ Does not contain and / or Ta 5+ Does not contain and / or Sn 4+ Does not contain and / or Ce 4+ Does not include.

11. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: Ba 2+ : 28-45%, and / or Sr 2+ : 0-10% and / or Mg 2+ : 0-10% and / or Ca 2+ : 0 to 10%, and / or La 3+ : 0-10%, and / or Gd 3+ : 0 to 10%, and / or Y 3+ : 0 to 10%, and / or Nb 5+ : 0 to 10%, and / or W 6+ : 0 to 10% and / or Ti 4+ : 0-10%, and / or F - : 15-45% and / or O 2- : 55 to 85%.

12. The optical glass according to any one of claims 1 to 3, comprising the following components in mol %: Ba 2+ : 33-38%, and / or Sr 2+ : 2-7% and / or Mg 2+ : 2-6%, and / or Ca 2+ : 0 to 5%, and / or La 3+ : 0-3%, and / or Gd 3+ : 0 to 3%, and / or Y 3+ : 1 to 7%, and / or Nb 5+ : 0 to 4%, and / or W 6+ : 0 to 5% and / or Ti 4+ : 0 to 2%, and / or F - : 21-35%, and / or O 2- : 65 to 79%.

13. Components are expressed in mole %, and anions further include: Cl - : 0 to 1%, and / or Br - : 0 to 1%, and / or I - : 0 to 1%, the optical glass according to any one of claims 1 to 3.

14. The refractive index n of the optical glass d is 1.57 to 1.66, Abbe number ν d The optical glass according to any one of claims 1 to 3, wherein the refractive index is 56 to 65.

15. The refractive index n of the optical glass d is 1.60 to 1.63, Abbe number ν d The optical glass according to any one of claims 1 to 3, wherein

16. ΔP of the optical glass C,s Values are less than or equal to 0 and / or ΔP C,t Value is -0.01 or less and / or water stability D W Class 3 or higher and / or acid resistance D A is Class 3 or higher, and / or weather resistance CR is Class 2 or higher, and / or transition temperature T g is 620°C or less, and / or density ρ is 4.60 g / cm 3 Below, and / or λ 80 is 380 nm or less, and / or λ 5 The optical glass according to any one of claims 1 to 3, wherein the refractive index is 330 nm or less.

17. ΔP of the optical glass C,s Values are less than or equal to -0.02 and / or ΔP C,t Value is -0.05 or less and / or water stability D W Class 2 or higher and / or acid resistance D A is Class 2 or higher, and / or weather resistance CR is Class 1, and / or transition temperature T g is 600°C or less, and / or density ρ is 4.40 g / cm 3 Below, and / or λ 80 is 370 nm or less, and / or λ 5 The optical glass according to any one of claims 1 to 3, wherein the refractive index is 320 nm or less.

18. An optical element manufactured by the optical glass according to any one of claims 1 to 17.

19. An optical instrument comprising the optical glass according to any one of claims 1 to 17 and / or the optical element according to claim 18.

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