Optical glass, glass preforms, optical components and optical instruments

Abstract

This invention provides an optical glass with a refractive index of 1.76–1.83, an Abbe number of 21–27, and a high partial dispersion ratio. The optical glass, with its composition expressed as molar percentage, contains: P₂O₅: 20–40%; TiO₂: 10–30%; Nb₂O₅: 3–20%; WO₃: 4–20%; Na₂O: 5–26%; K₂O: 5–26%. Through reasonable composition design, the optical glass obtained by this invention has a high refractive index, a low Abbe number, and a high partial dispersion ratio, meeting the requirements for use in high-image-quality optical instruments.

Description

Technical Field

[0001] This invention relates to an optical glass, and more particularly to an optical glass with a refractive index of 1.76 to 1.83, an Abbe number of 21 to 27, and a high partial dispersion ratio, as well as glass preforms, optical elements, and optical instruments made therefrom. Background Technology

[0002] With the development of technology, the pixel requirements of equipment in fields such as photography, imaging, and security are becoming increasingly higher. Optical glass with low Abbe number and high partial dispersion ratio, which can provide high image quality, is welcomed by the market. Therefore, the market demand for optical glass with a refractive index of 1.76–1.83, an Abbe number of 21–27, and a high partial dispersion ratio is constantly increasing. For optical glass, in addition to the desired optical performance, it must also possess excellent internal quality (such as streaks and bubbles). If the composition design of optical glass is unreasonable, it is easy to cause a large number of bubbles or streaks inside the glass. When designing the composition of optical glass, its resistance to crystallization needs to be considered. Poor resistance to crystallization can easily lead to crystallization during the production or pressing process, causing devitrification or breakage of the optical glass, and in severe cases, even rendering the glass unusable. Therefore, it is desirable for optical glass to have excellent internal quality and resistance to crystallization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an optical glass with a refractive index of 1.76 to 1.83, an Abbe number of 21 to 27, and a high partial dispersion ratio.

[0004] The technical solution adopted by this invention to solve the technical problem is:

[0005] Optical glass, whose composition is expressed as molar percentage, contains: P2O5: 20-40%; TiO2: 10-30%; Nb2O5: 3-20%; WO3: 4-20%; Na2O: 5-26%; K2O: 5-26%.

[0006] Furthermore, the optical glass, expressed as a molar percentage, further contains: Bi₂O₃: 0–12%; and / or Sb₂O₃: 0–13%; and / or Al₂O₃: 0–7%; and / or Li₂O: 0–15%; and / or BaO: 0–9%; and / or Ta₂O₅: 0–5%; and / or ZnO: 0–9%.

[0007] Optical glass, whose composition is expressed as molar percentage, consists of P2O5: 20-40%; TiO2: 10-30%; Nb2O5: 3-20%; WO3: 4-20%; Na2O: 5-26%; K2O: 5-26%; Bi2O3: 0-12%; Sb2O3: 0-13%; Al2O3: 0-7%; Li2O: 0-15%; BaO: 0-9%; Ta2O5: 0-5%; ZnO: 0-9%.

[0008] Furthermore, the optical glass comprises, in molar percentage, TiO2 / P2O5 of 0.3 to 1.4, preferably 0.35 to 1.2, and more preferably 0.4 to 0.9.

[0009] Furthermore, the optical glass has components expressed as mole percentages, wherein WO3 / (Bi2O3+Sb2O3) is 0.3 to 7.0, preferably WO3 / (Bi2O3+Sb2O3) is 0.4 to 6.0, and more preferably WO3 / (Bi2O3+Sb2O3) is 0.5 to 5.6.

[0010] Furthermore, the composition of the optical glass is expressed as a mole percentage, wherein:

[0011] The ratio of (WO3+TiO2+Sb2O3) / Nb2O5 is 1.0 to 8.0, preferably 1.3 to 6.0, and more preferably 1.6 to 5.6.

[0012] Furthermore, the composition of the optical glass is expressed as a mole percentage, wherein (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.2 to 1.5, preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.3 to 1.3, and more preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.5 to 1.1.

[0013] Furthermore, the optical glass comprises, in molar percentage, P2O5: 22-37%, preferably P2O5: 25-35%; and / or TiO2: 12-28%, preferably TiO2: 15-25%; and / or Nb2O5: 4-18%, preferably Nb2O5: 5-15%; and / or WO3: 5-17%, preferably WO3: 6-15%; and / or Na2O: 8-23%, preferably Na2O: 10-20%; and / or K2O: 8-23%, preferably K2O: 10-20%; and / or Bi2O3: 0.5-10%, preferably Bi2O3: 1-8%; and / or Sb2O3: 0-11%, preferably Sb2O3: 0.5-8%, more preferably Sb2O3: greater than 2% but less than or equal to 7%; and / or Al2O3: 0-5%, preferably Al2O3: 0-3%; and / or Li2O: 0-12%, preferably Li2O: 0-10%; and / or BaO: 0-7%, preferably BaO: 0-5%; and / or Ta2O5: 0-4%, preferably Ta2O5: 0-3%; and / or ZnO: 0-7%, preferably ZnO: 0-5%.

[0014] Furthermore, the optical glass, whose composition is expressed as a mole percentage, also contains: Gd2O3+SrO+MgO+CaO: 0-5%, preferably Gd2O3+SrO+MgO+CaO: 0-3%, more preferably Gd2O3+SrO+MgO+CaO: 0-1%, and even more preferably does not contain Gd2O3, and / or does not contain SrO, and / or does not contain MgO, and / or does not contain CaO.

[0015] Furthermore, the refractive index n of the optical glass... d The Abbe number is 1.76–1.83, preferably 1.77–1.82. d The partial dispersion ratio P is 21–27, preferably 22–26. g,F The value is 0.620 to 0.645, preferably 0.623 to 0.644.

[0016] Furthermore, the optical glass exhibits an anti-crystallization performance of grade C or higher, preferably grade B or higher, and more preferably grade A; and / or water resistance stability of grade D. W It is classified as Class 2 or above, preferably Class 1; and / or acid resistance stability D A It is classified as Class 2 or above, preferably Class 1; and / or its density ρ is 3.80 g / cm³. 3 The preferred value is 3.70 g / cm³. 3 The following; and / or the degree of bubble formation is A or above, preferably A0 or above, more preferably A 00 Grade; and / or coefficient of thermal expansion α 100 / 300℃ 100×10-7 / K~140×10 -7 / K, preferably 110×10 -7 / K~130×10 -7 / K; and / or transition temperature T g Temperature is below 550°C, preferably below 540°C; and / or chromaticity λ 80 The wavelength is below 530nm, preferably below 510nm.

[0017] The glass preform is made of the aforementioned optical glass.

[0018] The optical element is made of the optical glass described above, or of the glass preform described above.

[0019] An optical instrument containing the aforementioned optical glass and / or containing the aforementioned optical elements.

[0020] The beneficial effects of this invention are: through reasonable component design, the optical glass obtained by this invention has a high refractive index, a low Abbe number, and a high partial dispersion ratio, which meets the requirements of high-image-quality optical instruments.

[0021] In some embodiments, the optical glass obtained by the present invention has excellent overall performance, as well as excellent bubble reduction and anti-crystallization properties. Detailed Implementation

[0022] The embodiments of the optical glass of the present invention will now be described in detail. However, the present invention is not limited to the embodiments described below, and appropriate modifications can be made to implement it within the scope of the purpose of the present invention. Furthermore, regarding repeated descriptions, although there are appropriate omissions, this will not limit the spirit of the invention. In the following text, the optical glass of the present invention will sometimes be simply referred to as glass.

[0023] Optical Glass

[0024] The composition ranges of each component (ingredients) of the optical glass of the present invention are described below. In this invention, unless otherwise specified, the content of each component, the total content, and the total content are all expressed as molar percentages (mol%), that is, the molar percentage of the content of each component, the total content, and the total content relative to the total amount of glass material converted into oxides. Here, "converted into oxides" refers to the total molar amount of the oxides used as raw materials for the optical glass of the present invention, where the oxides, complex salts, and hydroxides decompose and transform into oxides upon melting, and the total molar amount of the oxides is taken as 100%.

[0025] Unless otherwise specified in the specific context, the numerical ranges listed in this invention include upper and lower limits, and "above" and "below" include endpoint values ​​and all integers and fractions included in the range, but are not limited to the specific values ​​listed when the range is defined. The term "and / or" as used herein is inclusive; for example, "A and / or B" means only A, or only B, or both A and B.

[0026] <Essential and Optional Components>

[0027] In this invention, P2O5 is a network-forming component of the glass, playing a role in maintaining glass stability and providing suitable viscosity for molten glass forming. If the P2O5 content is too high, it will lead to a decrease in the glass's refractive index, high high-temperature viscosity, and poor melting performance; conversely, a low P2O5 content will result in poor resistance to crystallization and a tendency for streaks to appear. Therefore, the P2O5 content is 20–40%, preferably 22–37%, and more preferably 25–35%.

[0028] In this invention, TiO2 is a network-forming component of the glass, which increases the glass's refractive index and partial dispersion ratio while simultaneously reducing the Abbe number. Excessive TiO2 content leads to poorer anti-crystallization properties and a darker glass color due to valence changes; conversely, insufficient TiO2 content results in a lower partial dispersion ratio and difficulty in achieving the target Abbe number. Therefore, the TiO2 content is 10–30%, preferably 12–28%, and more preferably 15–25%.

[0029] In some embodiments, by controlling the ratio of TiO2 content to P2O5 content (TiO2 / P2O5) to be below 1.4, the glass can exhibit good anti-crystallization properties and transmittance. However, if TiO2 / P2O5 is below 0.3, the partial dispersion of the glass is relatively low, and the Abbe number is difficult to meet the requirements. Therefore, a TiO2 / P2O5 ratio of 0.3 to 1.4 is preferred, a TiO2 / P2O5 ratio of 0.35 to 1.2 is more preferred, and a TiO2 / P2O5 ratio of 0.4 to 0.9 is even more preferred.

[0030] In this invention, Nb₂O₅ is a network-forming component of the glass, which can increase the refractive index of the glass, improve its resistance to crystallization, and enhance its chemical stability. However, when its content is high, the high-temperature viscosity of the glass increases, which is detrimental to melting, and it also reduces the partial dispersion ratio of the glass. Therefore, the content of Nb₂O₅ is 3–20%, preferably 4–18%, and more preferably 5–15%.

[0031] In this invention, WO3 increases the refractive index of the glass, reduces the Abbe number, and also improves the partial dispersion ratio of the glass. However, when its content is too high, the visible light transmittance of the glass decreases, and the raw material cost of the glass increases. Therefore, the WO3 content is 4-20%, preferably 5-17%, and more preferably 6-15%.

[0032] Na₂O is an alkali metal oxide with a strong fluxing effect, which is beneficial for increasing the content of other components in glass that contribute to partial dispersion ratio and can lower the glass transition temperature. However, excessive Na₂O content can lead to easy crystallization of the glass, which is detrimental to subsequent hot working and also negatively affects the chemical stability and coefficient of thermal expansion of the glass. Therefore, in this invention, the Na₂O content is 5–26%, preferably 8–23%, and more preferably 10–20%.

[0033] K₂O is an alkali metal oxide with strong fluxing properties, which helps increase the content of other components in the glass that are beneficial to the dispersion ratio, and can also reduce the high-temperature viscosity of the glass, facilitating the removal of bubbles. However, excessive K₂O content leads to an increase in the Abbe number of the glass and is detrimental to the chemical stability and coefficient of thermal expansion of the glass. Therefore, in this invention, the K₂O content is 5–26%, preferably 8–23%, and more preferably 10–20%.

[0034] Bi₂O₃ can increase the refractive index of glass and improve some dispersion ratio, while also enhancing the glass's resistance to crystallization and reducing the Abbe number. However, excessive Bi₂O₃ content can lead to decreased glass transmittance, and the glass is prone to devitrification when the content exceeds 12%. Therefore, the Bi₂O₃ content is 0–12%, preferably 0.5–10%, and more preferably 1–8%.

[0035] Sb₂O₃ can improve the partial dispersion ratio of glass and enhance its melting properties. However, if its content is too high, the colorimetry of the glass will deteriorate, and the Abbe number of the glass will also increase. Therefore, the content of Sb₂O₃ is 0–13%, preferably 0–11%, more preferably 0.5–8%, and even more preferably greater than 2% but less than or equal to 7%.

[0036] In some embodiments, by controlling the ratio of WO3 content to the total content of Bi2O3 and Sb2O3 (WO3 / (Bi2O3+Sb2O3)) to be below 7.0, the glass can have suitable density and colorimetry. However, if WO3 / (Bi2O3+Sb2O3) is below 0.3, the glass transition temperature and high-temperature viscosity are relatively high, bubbles are easily formed in the glass, and the stability of the glass decreases. Therefore, it is preferable that WO3 / (Bi2O3+Sb2O3) is 0.3 to 7.0, more preferably 0.4 to 6.0, and even more preferably 0.5 to 5.6.

[0037] In some embodiments, by controlling the ratio (WO3+TiO2+Sb2O3) / Nb2O5 between the total content of WO3, TiO2, and Sb2O3 and the content of Nb2O5 to be below 8.0, the partial dispersion ratio and anti-crystallization properties of the glass can be prevented from deteriorating, and the glass can have suitable partial dispersion ratio and anti-crystallization properties. However, if (WO3+TiO2+Sb2O3) / Nb2O5 is below 1.0, the striations and bubble content of the glass deteriorate, and the glass is prone to crystal formation. Therefore, it is preferable that (WO3+TiO2+Sb2O3) / Nb2O5 is 1.0 to 8.0, more preferably (WO3+TiO2+Sb2O3) / Nb2O5 is 1.3 to 6.0, and even more preferably (WO3+TiO2+Sb2O3) / Nb2O5 is 1.6 to 5.6.

[0038] In this invention, Al2O3 reduces the coefficient of thermal expansion of glass and improves its resistance to crystallization. However, excessive Al2O3 content will lead to an increase in the glass transition temperature and a rise in high-temperature viscosity, making it difficult to eliminate bubbles. Therefore, the Al2O3 content is 0–7%, preferably 0–5%, and more preferably 0–3%.

[0039] Li₂O is an alkali metal oxide with strong fluxing properties, which helps increase the content of other components beneficial to strength in glass. Li₂O can also improve the visible light transmittance of glass. However, excessively high Li₂O content can lead to a decrease in the glass's refractive index and chemical stability. Therefore, in this invention, the Li₂O content is 0–15%, preferably 0–12%, and more preferably 0–10%.

[0040] In some embodiments, by controlling the ratio (Na2O+K2O+Li2O) / (Nb2O5+P2O5) between the total content of Na2O, K2O, and Li2O and the total content of Nb2O5 and P2O5 to be below 1.5, the glass can maintain good melting performance and colorability. However, if (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is below 0.2, the glass is prone to devitrification and its coefficient of thermal expansion deteriorates. Therefore, it is preferable that (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.2 to 1.5, more preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.3 to 1.3, and even more preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.5 to 1.1.

[0041] BaO is an alkaline earth metal oxide used to adjust the high-temperature viscosity of glass and improve its thermal stability. However, a high BaO content can lead to a decrease in the glass's devitrification resistance and make it prone to crystal formation. Therefore, the BaO content is 0–9%, preferably 0–7%, and more preferably 0–5%.

[0042] In this invention, ZnO enhances the chemical stability of glass and improves its resistance to crystallization. However, excessive ZnO content will lead to decreased glass transmittance and increased high-temperature viscosity, making it difficult to eliminate bubbles. Therefore, the ZnO content is 0–9%, preferably 0–7%, and more preferably 0–5%.

[0043] In this invention, Ta2O5 improves the partial dispersion ratio and refractive index of the glass. However, excessive Ta2O5 content can lead to the formation of inclusions within the glass and also increase the cost. Therefore, the Ta2O5 content is 0–5%, preferably 0–4%, and more preferably 0–3%.

[0044] Without affecting the glass properties of the present invention, one or more components selected from Gd2O3, SrO, MgO, and CaO may be appropriately included. The content of the above components individually or in total is preferably 0 to 5%, more preferably 0 to 3%, further preferably 0 to 1%, and even more preferably not containing the above components.

[0045] <Components that should not be present>

[0046] In the glass of this invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo are contained in small amounts, either alone or in combination, the glass will be colored and absorb at specific wavelengths in the visible light region, thereby weakening the property of this invention to improve visible light transmittance. Therefore, it is preferable that the glass does not contain these oxides, especially for optical glass where transmittance in the visible light region is required.

[0047] Oxides of Th, Cd, Tl, Os, Be, and Se have been increasingly subject to controlled use in recent years due to their status as hazardous chemicals. Environmental protection measures are essential not only in glass manufacturing but also in processing and post-product disposal. Therefore, given the importance of environmental impact, it is preferable to avoid the presence of these substances, except where their contamination is unavoidable. As a result, the optical glass becomes virtually free of pollutants. Therefore, the optical glass of this invention can be manufactured, processed, and disposed of even without special environmental countermeasures.

[0048] To achieve environmental friendliness, the optical glass of the present invention preferably does not contain As2O3 and PbO.

[0049] The terms "not containing" and "0%" as used herein mean that the compound, molecule, or element was not intentionally added to the optical glass of this invention as a raw material; however, as raw materials and / or equipment for producing optical glass, there may be certain impurities or components that are not intentionally added, which may be present in small or trace amounts in the final optical glass, and such cases are also within the scope of protection of this patent.

[0050] The performance of the optical glass of the present invention will now be described.

[0051] <Refractive Index and Abbe Number>

[0052] The refractive index (n) of optical glass d ) and Abbe number (ν d Test according to the method specified in GB / T 7962.1—2010.

[0053] In some embodiments, the refractive index (n) of the optical glass of the present invention d The lower limit is 1.76, and the preferred lower limit is 1.77.

[0054] In some embodiments, the refractive index (n) of the optical glass of the present invention d The upper limit for () is 1.83, and the preferred upper limit is 1.82.

[0055] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The lower limit is 21, and the preferred lower limit is 22.

[0056] In some embodiments, the Abbe number (ν) of the optical glass of the present invention d The upper limit for () is 27, and the preferred upper limit is 26.

[0057] Partial dispersion ratio (P) g,F )>

[0058] Partial dispersion ratio (P) of optical glassg,F ) represents partial dispersion (n g -n F ) relative to the principal dispersion (n F -n C The ratio of n to n can be obtained from the following formula (1). g This represents the refractive index of the glass for light with a wavelength of 435.835 nm. Partial dispersion ratio (P...) g,F The value is up to the third decimal place.

[0059] P g,F =(n g -n F ) / (n F -n C (1)

[0060] In some embodiments, the partial dispersion ratio (P) of the optical glass of the present invention is... g,F The lower limit is 0.620, and the preferred value is 0.623.

[0061] In some embodiments, the partial dispersion ratio (P) of the optical glass of the present invention is... g,F The upper limit is 0.645, and the preferred value is 0.644.

[0062] Anti-crystallization properties

[0063] The resistance to crystallization of glass was tested using the following methods:

[0064] The glass sample was processed to a size of 20×20×10mm, polished on both sides, and then placed in a container at a temperature of T. g Hold the glass in a crystallization furnace at +200℃ for 30 minutes, remove it and cool it, then polish both large surfaces. Judge the glass's anti-crystallization performance according to Table 1 below, with Grade A being the best and Grade E being the worst.

[0065] Table 1. Grading and Judgment Criteria for Resistance to Crystallization:

[0066] serial number level standard 1 A No visible crystal particles 2 B Visible crystal particles, few in number and dispersed. 3 C Large or densely packed small crystal particles are visible to the naked eye. 4 D Large and dense crystallized grains 5 E Complete crystallization and devitrification of glass

[0067] In some embodiments, the anti-crystallization performance of the optical glass of the present invention is grade C or above, preferably grade B or above, and more preferably grade A.

[0068] <Stability under water resistance>

[0069] Water resistance stability of optical glass (D) W (Powder method) Tested according to the method specified in GB / T 17129.

[0070] In some embodiments, the water resistance stability (D) of the optical glass of the present invention is... W There are two or more categories, with category 1 being preferred.

[0071] <Stability under acid conditions>

[0072] Acid resistance stability of optical glass (D) A (Powder method) Tested according to the method specified in GB / T 17129.

[0073] In some embodiments, the acid resistance stability (D) of the optical glass of the present invention is... A There are two or more categories, with category 1 being preferred.

[0074] <Density>

[0075] The density (ρ) of the glass was tested according to the method specified in GB / T7962.20—2010.

[0076] In some embodiments, the density (ρ) of the optical glass of the present invention is 3.80 g / cm³. 3 The preferred value is 3.70 g / cm³. 3 the following.

[0077] <Effervescence>

[0078] The bubble content of optical glass shall be tested according to the method specified in GB / T7962.8—2010.

[0079] In some embodiments, the bubble degree of the optical glass of the present invention is grade A or above, preferably grade A0 or above, and more preferably grade A. 00 class.

[0080] Coefficient of thermal expansion

[0081] The coefficient of thermal expansion of optical glass (α) 100 / 300℃ Data were tested at 100–300°C according to the method specified in GB / T7962.16—2010.

[0082] In some embodiments, the coefficient of thermal expansion (α) of the optical glass of the present invention is... 100 / 300℃ ) is 100×10 -7 / K~140×10 -7 / K, preferably 110×10 -7 / K~130×10 -7 / K.

[0083] <Transition Temperature>

[0084] Transition temperature of optical glass (T) g Test according to the method specified in GB / T7962.16—2010.

[0085] In some embodiments, the transition temperature (T) of the optical glass of the present invention is...g The temperature should be below 550℃, preferably below 540℃.

[0086] <Colorization>

[0087] The short-wavelength transmission spectral characteristics of the glass of this invention are expressed using colorimetry (λ). 80 ) represents. λ 80 This refers to the wavelength corresponding to a glass transmittance of 80%. λ 80 The measurement was performed using a glass with a thickness of 10 ± 0.1 mm and two optically polished, parallel planes. The spectral transmittance was measured in the wavelength range from 280 nm to 700 nm, and wavelengths exhibiting 80% transmittance were recorded. Spectroscopic transmittance, or transmittance, is the value of the light incident perpendicularly to the aforementioned surface of the glass with an intensity I... in Light passes through the glass and exits from a plane with an intensity of I. out In the case of light, through I out / I in The value represents the transmittance, which also includes the surface reflection loss on the aforementioned surfaces of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in optical glass, λ... 80 A low value means that the glass itself has very little coloration and high light transmittance.

[0088] In some embodiments, the tinting strength (λ) of the optical glass of the present invention 80 The wavelength is 530nm or less, preferably 510nm or less.

[0089] [Manufacturing methods for optical glass]

[0090] The manufacturing method of the optical glass of this invention is as follows: The glass of this invention is produced using conventional raw materials and processes, including but not limited to using salt raw materials (such as carbonates, nitrates, sulfates, etc.), hydroxides, oxides, boric acid, etc., as raw materials. After the raw materials are prepared according to conventional methods, the prepared furnace charge is put into a melting furnace (such as a platinum crucible, quartz crucible, etc.) at 1000-1400℃ for melting. After clarification, stirring, and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained. This molten glass is then cast in a mold and annealed. Those skilled in the art can appropriately select raw materials, process methods, and process parameters according to actual needs.

[0091] [Glass preforms and optical components]

[0092] Glass preforms can be manufactured from the optical glass using methods such as grinding, hot pressing, or precision stamping. Specifically, glass preforms can be manufactured by machining the optical glass, such as grinding and polishing; or by hot pressing a preform made from the optical glass for molding and then grinding it; or by precision stamping a preform made from the ground glass.

[0093] It should be noted that the means of preparing the glass preform are not limited to those described above. As mentioned above, the optical glass of the present invention is useful for various optical components and optical designs, and it is particularly preferred to form a preform from the optical glass of the present invention, using the preform for re-hot pressing, precision stamping, etc., to manufacture optical components such as lenses and prisms.

[0094] Both the glass preform and the optical element of the present invention are formed from the optical glass described above. The glass preform of the present invention possesses the excellent properties of optical glass; the optical element of the present invention possesses the excellent properties of optical glass, and can provide various optical elements such as lenses and prisms with high optical value.

[0095] Examples of lenses include concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and so on, where the lens surface is spherical or aspherical.

[0096] [Optical Instruments]

[0097] The optical elements formed by the optical glass of this invention can be used to manufacture optical instruments such as photographic equipment, video equipment, display equipment, and monitoring equipment.

[0098] Example

[0099] <Example of Optical Glass>

[0100] To further illustrate and explain the technical solution of the present invention, the following non-limiting embodiments are provided.

[0101] In this embodiment, optical glass with the composition shown in Tables 2 to 4 was obtained using the optical glass manufacturing method described above. Furthermore, the properties of each glass were measured using the testing method described in this invention, and the measurement results are shown in Tables 2 to 4.

[0102] Table 2.

[0103] Example (mol%) 1# 2# 3# 4# 5# 6# 7# <![CDATA[P2O5]]> 35.0 29.2 26.1 27.4 25.8 25.9 28.6 <![CDATA[TiO2]]> 15.6 17.4 16.5 17.1 17.2 15.8 18.2 <![CDATA[Nb2O5]]> 7.1 5.0 6.3 5.1 6.9 6.7 8.8 <![CDATA[WO3]]> 6.3 7.7 15.0 6.3 7.1 7.8 7.0 <![CDATA[Na2O]]> 10.7 11.1 11.7 10.5 12.2 20.0 11.4 <![CDATA[K2O]]> 10.5 12.2 11.8 13.2 11.5 12.2 11.4 <![CDATA[Bi2O3]]> 1.7 2.0 3.9 8.0 2.6 2.2 5.0 <![CDATA[Sb2O3]]> 0.0 1.5 0.4 5.3 8.0 0.8 3.2 <![CDATA[Al2O3]]> 0.2 2.4 0.9 1.2 2.4 1.2 0.0 <![CDATA[Li2O]]> 9.4 6.0 0.5 1.2 0.3 2.3 1.5 BaO 0.0 1.3 1.1 1.5 0.0 3.2 1.3 <![CDATA[Ta2O5]]> 0.0 3.0 0.8 1.8 2.4 0.0 1.7 ZnO 3.5 1.2 5.0 1.4 3.6 1.9 1.9 total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 <![CDATA[TiO2 / P2O5]]> 0.45 0.60 0.63 0.62 0.67 0.61 0.64 <![CDATA[WO3 / (Bi2O3+Sb2O3)]]> 3.71 2.20 3.49 0.47 0.67 2.60 0.85 <![CDATA[(Na2O+K2O+Li2O) / (Nb2O5+P2O5)]]> 0.73 0.86 0.74 0.77 0.73 1.06 0.65 <![CDATA[(WO3+TiO2+Sb2O3) / Nb2O5]]> 3.08 5.32 5.06 5.63 4.68 3.64 3.23 <![CDATA[n d ]]> 1.77010 1.78134 1.80076 1.81639 1.80864 1.77351 1.81408 <![CDATA[v d ]]> 25.9 24.5 22.1 22.6 23.0 24.7 22.7 <![CDATA[P g,F ]]> 0.6236 0.6277 0.6365 0.6431 0.6435 0.6257 0.6418 Anti-crystallization performance (grade) A A A A C B A <![CDATA[D w (Class)]]> 1 1 1 1 1 1 1 <![CDATA[D A (Class)]]> 1 1 1 1 1 2 1 <![CDATA[ρ(g / cm 3 )]]> 3.64 3.53 3.66 3.62 3.68 3.56 3.67 Bubble density (grade) <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A0]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[α 100 / 300℃ (×10 -7 / K)]]> 127 115 120 116 121 110 117 <![CDATA[T g (℃)]]> 521 537 536 520 535 522 521 <![CDATA[λ 80 (nm)]]> 509 503 525 504 530 506 474

[0104] Table 3.

[0105]

[0106]

[0107] Table 4.

[0108]

[0109]

[0110] <Example of Glass Prefabricated Components>

[0111] The glass obtained from optical glass Examples 1 to 20# is used to manufacture preforms of various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses, by means of grinding, hot pressing, precision stamping, or other molding methods.

[0112] <Optical Component Examples>

[0113] Annealing these preforms obtained from the above glass preform examples reduces internal deformation of the glass while fine-tuning them so that optical properties such as refractive index reach the desired values.

[0114] Next, the prefabricated parts are ground and polished to produce various lenses and prisms, such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. Anti-reflective coatings can also be applied to the surface of the resulting optical elements.

[0115] <Examples of Optical Instruments>

[0116] The optical elements obtained from the above-described optical element embodiments can be used, through optical design, to form optical components or optical assemblies by using one or more optical elements. They can be used in, for example, imaging devices, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, photolithography, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or for camera equipment and devices in the automotive field.

Claims

1. Optical glass, characterized in that, Its composition, expressed as a molar percentage, is as follows: P2O5: 25–40%; TiO2: 10–30%; Nb2O5: 3–20%; WO3: 6–20%; Na2O: 5–26%; K2O: 8–26%; Bi2O3: 0–12%; Sb2O3: 0–13%; Al2O3: 0–7%; Li2O: 0–15%; BaO: 0–9%. Ta2O5: 0–5%; ZnO: Composition 0-9%, (WO3+TiO2+Sb2O3) / Nb2O5 ratio is 3.08-8.

0.

2. The optical glass according to claim 1, characterized in that, Its composition is expressed as a molar percentage, of which: TiO2 / P2O5 is 0.3 to 1.

4.

3. The optical glass according to claim 1, characterized in that, Its composition is expressed as a molar percentage, of which: TiO2 / P2O5 is 0.35 to 1.

2.

4. The optical glass according to claim 1, characterized in that, Its composition is expressed as a molar percentage, of which: TiO2 / P2O5 is 0.4 to 0.

9.

5. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which WO3 / (Bi2O3+Sb2O3) is 0.3 to 7.

0.

6. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which WO3 / (Bi2O3+Sb2O3) is 0.4 to 6.

0.

7. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which WO3 / (Bi2O3+Sb2O3) is 0.5 to 5.

6.

8. The optical glass according to claim 1, characterized in that, Its composition is expressed as a molar percentage, of which (WO3+TiO2+Sb2O3) / Nb2O5 is 3.08 to 6.

0.

9. The optical glass according to claim 1, characterized in that, Its composition is expressed as a molar percentage, of which (WO3+TiO2+Sb2O3) / Nb2O5 is 3.08 to 5.

6.

10. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.2 to 1.

5.

11. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.3 to 1.

3.

12. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.5 to 1.

1.

13. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, wherein: P2O5: 25-37%; and / or TiO2: 12-28%; and / or Nb2O5: 4-18%; and / or WO3: 6-17%; and / or Na2O: 8-23%; and / or K2O: 8-23%; and / or Bi2O3: 0.5-10%; and / or Sb2O3: 0-11%; and / or Al2O3: 0-5%; and / or Li2O: 0-12%; and / or BaO: 0-7%; and / or Ta2O5: 0-4%; and / or ZnO: 0-7%.

14. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, wherein: P2O5: 25-35%; and / or TiO2: 15-25%; and / or Nb2O5: 5-15%; and / or WO3: 6-15%; and / or Na2O: 10-20%; and / or K2O: 10-20%; and / or Bi2O3: 1-8%; and / or Sb2O3: 0.5-8%; and / or Al2O3: 0-3%; and / or Li2O: 0-10%; and / or BaO: 0-5%; and / or Ta2O5: 0-3%; and / or ZnO: 0-5%.

15. The optical glass according to claim 1, characterized in that, Its components are expressed as molar percentages, of which: Sb2O3: greater than 2% but less than or equal to 7%.

16. The optical glass according to claim 1, characterized in that, The refractive index n of the optical glass d The Abbe number v ranges from 1.76 to 1.

83. d The partial dispersion ratio P is 21–27. g,F The value ranges from 0.620 to 0.

645.

17. The optical glass according to claim 1, characterized in that, The refractive index n of the optical glass d The Abbe number v ranges from 1.77 to 1.

82. d The partial dispersion ratio P is 22–26. g,F The value ranges from 0.623 to 0.

644.

18. The optical glass according to claim 1, characterized in that, The optical glass exhibits anti-crystallization performance of grade C or higher; and / or water resistance stability of grade D. W Class 2 or above; and / or acid resistance stability D A Class 2 or above; and / or density ρ is 3.80 g / cm³. 3 The following; and / or a bubble degree of A or above; and / or a coefficient of thermal expansion α 100 / 300℃ 100×10 -7 / K~140×10 -7 / K; and / or transition temperature T g Temperature below 550℃; and / or chromaticity λ 80 It is below 530nm.

19. The optical glass according to claim 1, characterized in that, The optical glass exhibits anti-crystallization performance of grade B or higher; and / or water resistance stability of grade D. W Class 1; and / or acid resistance stability D A Class 1; and / or density ρ is 3.70 g / cm³. 3 The following; and / or a bubble degree of A0 or above; and / or a coefficient of thermal expansion α 100 / 300℃ 110×10 -7 / K~130×10 -7 / K; and / or transition temperature T g Temperature below 540℃; and / or chromaticity λ 80 It is below 510nm.

20. The optical glass according to claim 1, characterized in that, The optical glass has an anti-crystallization performance of Grade A; and / or a bubble degree of Grade A. 00 class.

21. A glass precast component, characterized in that, It is made of the optical glass described in any one of claims 1 to 20.

22. An optical element, characterized in that, It is made of optical glass as described in any one of claims 1 to 20, or of glass preform as described in claim 21.

23. An optical instrument, characterized in that, It contains the optical glass according to any one of claims 1 to 20, and / or contains the optical element according to claim 22.

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