Optical glass, glass preform, optical element and optical instrument

Abstract

The invention provides 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. The optical glass comprises the following components in percentage by mole: 20-40% of P2O5; 10 to 30 percent of TiO2; 3 to 20 percent of Nb2O5; wO3: 4%-20%; 5 to 26 percent of Na2O; and 5 to 26% of K2O. Through reasonable component design, the optical glass obtained by the invention has a relatively high refractive index, a relatively low Abbe number and a relatively high partial dispersion ratio, and meets the use of high-image-quality optical instruments.

Description

Technical Field

[0001] The present invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.76-1.83, an Abbe number of 21-27 and a relatively high partial dispersion ratio, and a glass preform, an optical element and an optical instrument made of the same. Background Art

[0002] With the development of the times, the pixel requirements of equipment in the fields of video, imaging, security, etc. are getting higher and higher. Optical glass with low Abbe number and high partial dispersion ratio that 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 higher partial dispersion ratio is increasing. For optical glass, in addition to the desired optical properties, it must also have excellent internal quality (such as stripe degree, bubble degree, etc.). If the component design of the optical glass is unreasonable, it is easy to cause a large number of bubbles or stripes inside the glass. When designing the composition of optical glass, its anti-crystallization performance needs to be considered. Poor anti-crystallization performance can easily lead to crystallization of the glass during the production or pressing process, causing devitrification or rupture of the optical glass, and even causing the glass to be scrapped in severe cases. Therefore, it is expected that optical glass has excellent intrinsic quality and anti-crystallization performance. 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 1.76-1.83, an Abbe number of 21-27 and a relatively high partial dispersion ratio.

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

[0005] Optical glass, the components of which are expressed in mole percentage, contain: P 2 O 5 :20~40%;TiO 2 :10~30%; Nb 2 O 5 :3~20%;WO 3 :4~20%;Na 2 O: 5~26%; K 2 O: 5~26%.

[0006] Furthermore, the optical glass, expressed in molar percentage, also contains: Bi 2 O 3 :0~12%;and / or Sb 2 O 3 :0~13%;and / or Al 2 O 3 :0~7%;and / or Li 2O: 0-15%; and / or BaO: 0-9%; and / or Ta 2 O 5 : 0-5%; and / or ZnO: 0-9%.

[0007] Optical glass, whose components are expressed in mole percentage, is composed of P 2 O 5 :20~40%;TiO 2 :10~30%; Nb 2 O 5 :3~20%;WO 3 :4~20%;Na 2 O: 5~26%; K 2 O: 5~26%; Bi 2 O 3 :0~12%; Sb 2 O 3 :0~13%;Al 2 O 3 :0~7%;Li 2 O: 0-15%; BaO: 0-9%; Ta 2 O 5 : 0~5%; ZnO: 0~9%.

[0008] Furthermore, the optical glass has components expressed in molar percentage, wherein: TiO 2 / P 2 O 5 0.3 to 1.4, preferably TiO 2 / P 2 O 5 0.35 to 1.2, more preferably TiO 2 / P 2 O 5 It is 0.4~0.9.

[0009] Furthermore, the optical glass has its components expressed in molar percentage, wherein: WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.3 to 7.0, preferably WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.4 to 6.0, more preferably WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.5~5.6.

[0010] Furthermore, the optical glass has components expressed in molar percentage, wherein:

[0011] (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 1.0 to 8.0, preferably (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 1.3 to 6.0, more preferably (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 It is 1.6~5.6.

[0012] Furthermore, the optical glass, its components are expressed in molar percentage, wherein: (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.2 to 1.5, preferably (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.3 to 1.3, more preferably (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.5~1.1.

[0013] Furthermore, the optical glass has its components expressed in molar percentage, wherein: 2 O 5 : 22-37%, preferably P 2 O 5 : 25-35%; and / or TiO 2 : 12-28%, preferably TiO 2 :15~25%;and / or Nb2 O 5 : 4-18%, preferably Nb 2 O 5 : 5-15%; and / or WO 3 : 5-17%, preferably WO 3 :6~15%;and / or Na 2 O: 8-23%, preferably Na 2 O: 10-20%; and / or K 2 O: 8-23%, preferably K 2 O: 10~20%; and / or Bi 2 O 3 : 0.5~10%, preferably Bi 2 O 3 :1~8%;and / or Sb 2 O 3 : 0-11%, preferably Sb 2 O 3 : 0.5 to 8%, more preferably Sb 2 O 3 : greater than 2% but less than or equal to 7%; and / or Al 2 O 3 : 0-5%, preferably Al 2 O 3 :0~3%;and / or Li 2 O: 0-12%, preferably Li 2 O: 0-10%; and / or BaO: 0-7%, preferably BaO: 0-5%; and / or Ta 2 O 5 : 0~4%, preferably Ta 2 O 5 : 0-3%; and / or ZnO: 0-7%, preferably ZnO: 0-5%.

[0014] Furthermore, the optical glass, expressed in molar percentage, also contains: Gd 2 O 3 +SrO+MgO+CaO: 0-5%, preferably Gd 2 O 3 + SrO + MgO + CaO: 0-3%, more preferably Gd 2 O 3 +SrO+MgO+CaO: 0-1%, preferably no Gd 2 O 3 , 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 is dis 1.76 to 1.83, preferably 1.77 to 1.82, and the Abbe number v d is 21 to 27, preferably 22 to 26, and the partial dispersion ratio P g,F It is 0.620 to 0.645, preferably 0.623 to 0.644.

[0016] Furthermore, the optical glass has an anti-crystallization performance of Class C or above, preferably Class B or above, more preferably Class A; and / or a water resistance stability of Class D or above. W 2 or more, preferably 1; and / or acid resistance stability D A 2 or more, preferably 1; and / or density ρ is 3.80 g / cm 3 Below, preferably 3.70g / cm 3 and / or the bubble degree is above grade A, preferably grade A 0 Grade A or above, preferably A 00 Level; and / or thermal expansion coefficient 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 550°C or less, preferably 540°C or less; and / or coloration λ 80 It is 530 nm or less, preferably 510 nm or less.

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

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

[0019] An optical instrument contains the above optical glass and / or contains the above optical element.

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

[0021] In some embodiments, the optical glass obtained by the present invention has excellent comprehensive performance, and also has excellent bubble degree and anti-crystallization performance. DETAILED DESCRIPTION

[0022] The following will describe the embodiments of the optical glass of the present invention in detail, but the present invention is not limited to the following embodiments, and can be implemented by appropriate changes within the scope of the purpose of the present invention. In addition, although there are appropriate omissions of descriptions of the repeated descriptions, the gist of the invention will not be limited thereby, and in the following content, the optical glass of the present invention is sometimes referred to as glass.

[0023] [Optical glass]

[0024] The following is an explanation of the range of each component (ingredient) of the optical glass of the present invention. In the present invention, unless otherwise specified, the content, total content, and total content of each component are all expressed in mole percentage (mol%), that is, the content, total content, and total content of each component are expressed in mole percentage relative to the total amount of glass material converted into an oxide composition. Here, the "composition converted into oxides" means that when oxides, complex salts, hydroxides, etc. used as raw materials for the optical glass components of the present invention decompose and transform into oxides during melting, the total molar amount of the oxide material is taken as 100%.

[0025] Unless otherwise specified in specific circumstances, the numerical ranges listed in the present invention include upper and lower limits, "above" and "below" include endpoint values, and all integers and fractions included in the range, without being limited to the specific values ​​listed when the range is defined. "And / or" referred to herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0026] <Essential Components and Optional Components>

[0027] P 2 O 5 In the present invention, P is a network former component of the glass, which has the function of maintaining the stability of the glass and the viscosity suitable for molten glass molding. 2 O 5 If the content of P is too high, the refractive index of the glass will decrease, the high temperature viscosity will be large, and the melting performance will deteriorate; 2 O 5 A lower content of P will result in poor anti-crystallization performance of the glass and easy streaking. 2 O 5 The content of is 20 to 40%, preferably 22 to 37%, and more preferably 25 to 35%.

[0028] TiO 2 In the present invention, TiO is a network former component of the glass, which has the effect of increasing the refractive index of the glass and the partial dispersion ratio, while reducing the Abbe number of the glass. 2Too high a content of TiO will lead to poor anti-crystallization performance of the glass and darker color of the glass due to price change; 2 A lower content of TiO will result in a decrease in the dispersion ratio of the glass and a difficulty in achieving the target Abbe number. 2 The content of is 10 to 30%, preferably 12 to 28%, more preferably 15 to 25%.

[0029] In some embodiments, by controlling the TiO 2 The content of P 2 O 5 The ratio between the content of TiO 2 / P 2 O 5 Below 1.4, the glass can have good anti-crystallization performance and transmittance. 2 / P 2 O 5 If the value is lower than 0.3, the partial dispersion of the glass is relatively low and the Abbe number is difficult to meet the requirements. 2 / P 2 O 5 0.3 to 1.4, more preferably TiO 2 / P 2 O 5 is 0.35 to 1.2, and TiO is more preferred 2 / P 2 O 5 It is 0.4~0.9.

[0030] Nb 2 O 5 In the present invention, Nb is a network former component of glass, which can increase the refractive index of glass, improve the anti-crystallization performance of glass, and improve the chemical stability of glass. However, when its content is high, the high-temperature viscosity of glass increases, which is not conducive to melting, and will reduce the partial dispersion ratio of glass. 2 O 5 The content of is 3 to 20%, preferably 4 to 18%, and more preferably 5 to 15%.

[0031] WO 3 In the present invention, WO has the effect of increasing the refractive index of glass, reducing the Abbe number, and also increasing the partial dispersion ratio of glass. However, when its content is too high, the visible light transmittance of glass decreases and the raw material cost of glass increases. 3 The content of is 4 to 20%, preferably 5 to 17%, and more preferably 6 to 15%.

[0032] Na 2O is an alkali metal oxide, which has a strong fluxing effect, which is beneficial to increase the content of other components in the glass that are beneficial to the partial dispersion ratio and can reduce the transition temperature of the glass. 2 Too high an O content will cause the glass to be easily crystallized, which is not conducive to subsequent thermal processing and is not conducive to the chemical stability and thermal expansion coefficient of the glass. 2 The content of O is 5 to 26%, preferably 8 to 23%, and more preferably 10 to 20%.

[0033] K 2 O is an alkali metal oxide, which has a strong fluxing effect, which is beneficial to increase the content of other components in the glass that are beneficial to the partial dispersion ratio, and can reduce the high-temperature viscosity of the glass, which is beneficial to the discharge of bubbles. 2 Too high an O content will lead to an increase in the Abbe number of the glass and be detrimental to the chemical stability and thermal expansion coefficient of the glass. 2 The content of O is 5 to 26%, preferably 8 to 23%, and more preferably 10 to 20%.

[0034] Bi 2 O 3 It can increase the refractive index of glass and improve the partial dispersion ratio, and at the same time has the effect of improving the anti-crystallization performance of glass and reducing the Abbe number. 2 O 3 Too high a content will lead to a decrease in glass transmittance, and when the content exceeds 12%, the glass is prone to devitrification. 2 O 3 The content of is 0 to 12%, preferably 0.5 to 10%, and more preferably 1 to 8%.

[0035] Sb 2 O 3 It can increase the partial dispersion ratio of glass and improve the melting performance of glass, but if its content is too high, the coloring degree of glass will deteriorate and the Abbe number of glass will also increase. 2 O 3 The content of is 0 to 13%, preferably 0 to 11%, more preferably 0.5 to 8%, and further preferably greater than 2% but less than or equal to 7%.

[0036] In some embodiments, by controlling WO 3 The content of Bi 2 O 3 and Sb 2 O 3 The ratio of the total content of WO 3 / (Bi 2 O 3 +Sb 2 O 3) is below 7.0, the glass can have a suitable density and coloring; but if WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is lower than 0.3, the transition temperature and high temperature viscosity of the glass are high, bubbles are easily formed in the glass, and the stability of the glass decreases. Therefore, WO is preferably 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.3 to 7.0, more preferably WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.4 to 6.0, and more preferably WO 3 / (Bi 2 O 3 +Sb 2 O 3 ) is 0.5~5.6.

[0037] In some embodiments, by controlling WO 3 、TiO 2 , Sb 2 O 3 The total content of Nb 2 O 5 The ratio between the contents of 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 Below 8.0, the partial dispersion ratio and anti-crystallization performance of the glass can be prevented from deteriorating, and the glass has a suitable partial dispersion ratio and anti-crystallization performance; but if (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 If the value is lower than 1.0, the streaks and bubbles of the glass will be deteriorated, and the glass will be prone to stone formation. 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 1.0 to 8.0, more preferably (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb2 O 5 is 1.3 to 6.0, more preferably (WO 3 +TiO 2 +Sb 2 O 3 ) / Nb 2 O 5 It is 1.6~5.6.

[0038] Al 2 O 3 In the present invention, the thermal expansion coefficient of the glass is reduced and the anti-crystallization performance of the glass is improved. 2 O 3 If the content is too high, the transition temperature of the glass will increase, and the viscosity of the glass at high temperature will increase, making it difficult to eliminate bubbles. 2 O 3 The content is 0 to 7%, preferably 0 to 5%, and more preferably 0 to 3%.

[0039] Li 2 O is an alkali metal oxide, which has a strong fluxing effect and is beneficial to increasing the content of other components in the glass that are beneficial to strength. 2 O can improve the visible light transmittance of glass. However, Li 2 Too high an O content will lead to a decrease in the refractive index and chemical stability of the glass. 2 The content of O is 0 to 15%, preferably 0 to 12%, and more preferably 0 to 10%.

[0040] In some embodiments, by controlling Na 2 O.K 2 O. Li 2 Total content of O and Nb 2 O 5 , P 2 O 5 The ratio between the total content (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is below 1.5, the glass can maintain good melting performance and coloring; but if (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is less than 0.2, the glass is prone to devitrification and the thermal expansion coefficient deteriorates.2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.2 to 1.5, more preferably (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.3 to 1.3, and more preferably (Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 ) is 0.5~1.1.

[0041] BaO is an alkaline earth metal oxide, which is used to adjust the high temperature viscosity of glass and improve the thermal stability of glass. However, a high BaO content will lead to a decrease in the devitrification resistance of the glass and stones are more likely to appear in the glass. Therefore, the content of BaO is 0-9%, preferably 0-7%, and more preferably 0-5%.

[0042] ZnO in the present invention has the effect of improving the chemical stability of glass and improving the anti-crystallization performance of glass. However, if the ZnO content is too high, the glass transmittance will be reduced, and the high-temperature viscosity of the glass will increase, and bubbles will be difficult to eliminate. Therefore, the ZnO content is 0-9%, preferably 0-7%, and more preferably 0-5%.

[0043] Ta 2 O 5 In the present invention, it has the effect of increasing the partial dispersion ratio of the glass and increasing the refractive index. 2 O 5 Too high a content will cause stones to form in the glass and also increase the cost of the glass. 2 O 5 The content is 0 to 5%, preferably 0 to 4%, and more preferably 0 to 3%.

[0044] Without affecting the performance of the glass of the present invention, Gd may be appropriately contained. 2 O 3 , SrO, MgO, CaO or one or more components, the content of the above components alone or in total is preferably 0-5%, more preferably 0-3%, further preferably 0-1%, and further preferably does not contain the above components.

[0045] <Components that should not be contained>

[0046] In the glass of the present invention, even if oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo are contained alone or in combination in small amounts, the glass will be colored and absorption will occur at specific wavelengths in the visible light region, thereby weakening the property of the present invention of improving the visible light transmittance. Therefore, it is preferably substantially free of oxides of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, especially for optical glasses that require transmittance at wavelengths in the visible light region.

[0047] The oxides of Th, Cd, Tl, Os, Be and Se have a tendency to be controlled in recent years as harmful chemical substances, and environmental protection measures are necessary not only in the manufacturing process of glass, but also in the processing process and the disposal after productization. Therefore, in the case of paying attention to the impact on the environment, it is preferred that they are not actually contained except for being inevitably mixed in. Thus, the optical glass does not actually contain substances that pollute the environment. Therefore, even if special environmental countermeasures are not taken, the optical glass of the present invention can be manufactured, processed and discarded.

[0048] In order to achieve environmental friendliness, the optical glass of the present invention preferably does not contain As 2 O 3 and PbO.

[0049] The "does not contain" and "0%" recorded in this article mean that the compound, molecule or element is not intentionally added as a raw material to the optical glass of the present invention; however, as raw materials and / or equipment for producing optical glass, there will be certain impurities or components that are not intentionally added, which will be contained in a small amount or trace amount in the final optical glass, and this situation is also within the scope of protection of the patent of this invention.

[0050] Next, the properties of the optical glass of the present invention will be described.

[0051] <Refractive Index and Abbe Number>

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

[0053] In some embodiments, the refractive index (n d ) has a lower limit of 1.76, and a preferred lower limit is 1.77.

[0054] In some embodiments, the refractive index (n d ) is 1.83, and the preferred upper limit is 1.82.

[0055] In some embodiments, the Abbe number (ν d ) has a lower limit of 21, and a preferred lower limit of 22.

[0056] In some embodiments, the Abbe number (ν d ) has an upper limit of 27, and a preferred upper limit of 26.

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

[0058] The partial dispersion ratio of optical glass (P g,F ) represents partial dispersion (n g -n F ) relative to the main dispersion (n F -n C ) is calculated by the following formula (1). g It indicates the refractive index of glass for light with a wavelength of 435.835nm. g,F ) is rounded to 3 decimal places.

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

[0060] In some embodiments, the partial dispersion ratio (P g,F )The lower limit is 0.620, preferably 0.623.

[0061] In some embodiments, the partial dispersion ratio (P g,F ) The upper limit is 0.645, preferably 0.644.

[0062] <Anti-crystallization performance>

[0063] The anti-crystallization performance of glass is tested by the following method:

[0064] The glass sample was processed into a size of 20×20×10 mm, polished on both sides, and placed in a temperature of T g Keep warm in a crystallization furnace at +200℃ for 30 minutes, take out and cool, then polish the two large surfaces. Judge the anti-crystallization performance of the glass according to Table 1 below, with Grade A being the best and Grade E being the worst.

[0065] Table 1. Classification and judgment criteria of anti-crystallization performance:

[0066] serial number level standard 1 A No visible crystallization particles 2 B Crystallization particles are visible to the naked eye, and the number is small and scattered 3 C Large dispersed or dense and small crystallization particles can be seen with the naked eye 4 D The crystallization particles are large and dense 5 E Complete devitrification of glass

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

[0068] <Water resistance stability>

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

[0070] In some embodiments, the water resistance stability (D W ) is 2 or more types, preferably 1 type.

[0071] <Acid resistance stability>

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

[0073] In some embodiments, the acid resistance stability (D A ) is 2 or more types, preferably 1 type.

[0074] <density>

[0075] The density of glass (ρ) is 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 / cm 3 Below, preferably 3.70g / cm 3 the following.

[0077] <Bubble Degree>

[0078] The bubble degree of optical glass is 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 above grade A, preferably grade A. 0 Grade A or above, preferably A 00 class.

[0080] <Coefficient of Thermal Expansion>

[0081] Thermal expansion coefficient of optical glass (α 100 / 300℃ ) The data at 100-300℃ were tested according to the method specified in GB / T7962.16-2010.

[0082] In some embodiments, the thermal expansion coefficient (α 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 ) Tested according to the method specified in GB / T7962.16-2010.

[0085] In some embodiments, the transition temperature (T g ) is 550°C or less, preferably 540°C or less.

[0086] <Color>

[0087] The short-wave transmission spectrum characteristics of the glass of the present invention are expressed by the coloration (λ 80 ) indicates. 80 Refers to the wavelength when the glass transmittance reaches 80%. 80 The measurement is to use a glass with a thickness of 10±0.1mm and two opposite planes parallel to each other and optically polished, and measure the spectral transmittance in the wavelength range from 280nm to 700nm and the wavelength at which the transmittance is 80%. The so-called spectral transmittance or transmittance is the wavelength at which the incident intensity I is perpendicular to the above surface of the glass. in Light of intensity I passes through the glass and emerges from a plane out The light of the case through I out / I in The amount expressed by λ also includes the transmittance of the surface reflection loss on the above surface of the glass. The higher the refractive index of the glass, the greater the surface reflection loss. Therefore, in optical glass, λ 80 A small value of means that the glass itself is less colored and has a high light transmittance.

[0088] In some embodiments, the coloration (λ 80 ) is below 530nm, preferably below 510nm.

[0089] [Method for producing optical glass]

[0090] The manufacturing method of the optical glass of the present invention is as follows: the glass of the present 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, and after the ingredients are prepared according to the conventional method, the prepared furnace materials are put into a melting furnace (such as a platinum crucible, a quartz crucible, etc.) at 1000-1400°C for melting, and after clarification, stirring and homogenization, a homogeneous molten glass without bubbles and undissolved substances is obtained, and the molten glass is 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] The glass preform can be made from the produced optical glass by means of grinding, or by means of press molding such as re-hot pressing, precision stamping, etc. That is, the glass preform can be made by mechanical processing such as grinding and polishing the optical glass, or by making a preform for press molding from the optical glass, re-hot pressing the preform and then grinding the preform to make the glass preform, or by precision stamping the preform produced by grinding.

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

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

[0095] Examples of the lens include various lenses having spherical or aspherical lens surfaces, 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.

[0096] [Optical instruments]

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

[0098] Example

[0099] <Optical Glass Example>

[0100] In order to further clearly illustrate and describe the technical solution of the present invention, the following non-limiting examples are provided.

[0101] This embodiment adopts the above optical glass manufacturing method to obtain optical glasses having the compositions shown in Tables 2 to 4. In addition, the properties of each glass are measured by the testing method described in the present 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[P 2 THE 5 ]]> 35.0 29.2 26.1 27.4 25.8 25.9 28.6 <![CDATA[TiO 2 ]]> 15.6 17.4 16.5 17.1 17.2 15.8 18.2 <![CDATA[Nb 2 THE 5 ]]> 7.1 5.0 6.3 5.1 6.9 6.7 8.8 <![CDATA[WO 3 ]]> 6.3 7.7 15.0 6.3 7.1 7.8 7.0 <![CDATA[Na 2 The]]> 10.7 11.1 11.7 10.5 12.2 20.0 11.4 <![CDATA[K 2 The]]> 10.5 12.2 11.8 13.2 11.5 12.2 11.4 <![CDATA[Bi 2 THE 3 ]]> 1.7 2.0 3.9 8.0 2.6 2.2 5.0 <![CDATA[Sb 2 THE 3 ]]> 0.0 1.5 0.4 5.3 8.0 0.8 3.2 <![CDATA[Al 2 THE 3 ]]> 0.2 2.4 0.9 1.2 2.4 1.2 0.0 <![CDATA[Li 2 The]]> 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[Ta 2 THE 5 ]]> 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[TiO 2 / P 2 O 5 ]]> 0.45 0.60 0.63 0.62 0.67 0.61 0.64 <![CDATA[WO 3 / (As 2 SHE 3 +Sb 2 SHE 3 )]]> 3.71 2.20 3.49 0.47 0.67 2.60 0.85 <![CDATA[(Na 2 O+K 2 O+Li 2 O) / (Nb 2 O 5 +P 2 O 5 )]]> 0.73 0.86 0.74 0.77 0.73 1.06 0.65 <![CDATA[(WO 3 +TiO 2 +Sb 2 THE 3 ) / Nb 2 THE 5 ]]> 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 degree (level) <![CDATA[A 00 ]]> <![CDATA[A 00 ]]> <![CDATA[A 0 ]]> <![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] <Glass Preform Example>

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

[0112] <Optical Element Embodiment>

[0113] The preforms obtained in the above-mentioned glass preform embodiments are annealed to reduce the deformation inside the glass and perform fine adjustments so that the optical properties such as the refractive index reach the desired values.

[0114] Next, each preform is ground and polished to produce various lenses and prisms such as concave meniscus lenses, convex meniscus lenses, biconvex lenses, biconcave lenses, plano-convex lenses, and plano-concave lenses. The surface of the obtained optical element may be coated with an anti-reflection film.

[0115] <Optical Instrument Embodiment>

[0116] The optical element obtained by the above-mentioned optical element embodiment is optically designed to form an optical component or optical assembly by using one or more optical elements. It can be used in, for example, imaging equipment, sensors, microscopes, medical technology, digital projection, communications, optical communication technology / information transmission, optics / lighting in the automotive field, lithography technology, excimer lasers, wafers, computer chips, and integrated circuits and electronic devices including such circuits and chips, or in camera equipment and devices in the vehicle field.

Claims

1. Optical glass, characterized in that: Its components are expressed in molar percentage and contain: P2O5: 20-40%; TiO2: 10-30%; Nb2O5: 3-20%; WO3: 4-20%; Na2O: 5-26%; K2O: 5-26%.

2. The optical glass according to claim 1, characterized in that: Its components, expressed in molar percentage, also contain: 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%.

3. Optical glass, characterized in that: Its components are expressed in molar percentage, including 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: composition 0~9%.

4. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in molar percentage, wherein: TiO2 / P2O5 is 0.3-1.4, preferably TiO2 / P2O5 is 0.35-1.2, and more preferably TiO2 / P2O5 is 0.4-0.

9.

5. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in molar percentage, wherein: WO3 / (Bi2O3+Sb2O3) is 0.3-7.0, preferably WO3 / (Bi2O3+Sb2O3) is 0.4-6.0, and more preferably WO3 / (Bi2O3+Sb2O3) is 0.5-5.

6.

6. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in molar percentage, wherein: (WO3+TiO2+Sb2O3) / Nb2O5 is 1.0-8.0, preferably (WO3+TiO2+Sb2O3) / Nb2O5 is 1.3-6.0, and more preferably (WO3+TiO2+Sb2O3) / Nb2O5 is 1.6-5.

6.

7. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in molar percentage, wherein: (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.2-1.5, preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.3-1.3, and more preferably (Na2O+K2O+Li2O) / (Nb2O5+P2O5) is 0.5-1.

1.

8. The optical glass according to any one of claims 1 to 3, characterized in that: Its components are expressed in molar percentage, wherein: 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%.

9. The optical glass according to claim 1 or 2, characterized in that: Its components, expressed in molar percentage, also contain: Gd2O3+SrO+MgO+CaO: 0~5%, preferably Gd2O3+SrO+MgO+CaO: 0~3%, more preferably Gd2O3+SrO+MgO+CaO: 0~1%, and further preferably does not contain Gd2O3, and / or does not contain SrO, and / or does not contain MgO, and / or does not contain CaO.

10. The optical glass according to any one of claims 1 to 3, characterized in that: The refractive index n of the optical glass d is 1.76 to 1.83, preferably 1.77 to 1.82, and the Abbe number v d is 21 to 27, preferably 22 to 26, and the partial dispersion ratio P g,F It is 0.620 to 0.645, preferably 0.623 to 0.

644.

11. The optical glass according to any one of claims 1 to 3, characterized in that: The optical glass has an anti-crystallization performance of Class C or above, preferably Class B or above, more preferably Class A; and / or a water resistance stability of Class D W 2 or more, preferably 1; and / or acid resistance stability D A 2 or more, preferably 1; and / or density ρ is 3.80 g / cm 3 Below, preferably 3.70g / cm 3 and / or the bubble degree is above grade A, preferably above grade A0, more preferably A 00 Level; and / or thermal expansion coefficient 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 550°C or less, preferably 540°C or less; and / or coloration λ 80 It is 530 nm or less, preferably 510 nm or less.

12. A glass preform, characterized in that: Made of the optical glass described in any one of claims 1 to 11.

13. An optical element, characterized in that The optical glass is made of the optical glass described in any one of claims 1 to 11, or the glass preform described in claim 12.

14. An optical instrument, characterized in that Contains the optical glass according to any one of claims 1 to 11, and / or contains the optical element according to claim 13.

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