TWI549919B - Precision molded optical glass, glass preforms, optical components and optical instruments - Google Patents
Precision molded optical glass, glass preforms, optical components and optical instruments Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本發明涉及一種光學玻璃，特別是涉及一種折射率為1.75～1.82、阿貝數為45～52的精密模壓用光學玻璃，以及由該光學玻璃構成的預製件、光學元件和光學儀器。The present invention relates to an optical glass, and more particularly to an optical glass for precision molding having a refractive index of 1.75 to 1.82 and an Abbe number of 45 to 52, and a preform, an optical element, and an optical instrument comprising the optical glass.
近年來，各類光電產品日益追求小型化、高性能多功能化，這就要求光學系統中使用的透鏡等光學元件也要求小型化、輕量化。由於使用非球面元件能很好的消除球差，減少光學元件的數量，因此在光學設計中，使用非球面元件已成為主流。In recent years, various types of optoelectronic products have been increasingly miniaturized and high-performance multi-functional, and this requires optical components such as lenses used in optical systems to be smaller and lighter. Since the use of aspherical elements can well eliminate spherical aberration and reduce the number of optical components, the use of aspherical components has become mainstream in optical design.
在非球面成型中，常用的方法是精密模壓成型。所謂精密模壓成型，就是在一定的溫度、壓力下，用具有預定產品形狀的高精密模具模壓玻璃預製件，從而獲得具有最終產品形狀並具有光學功能面的玻璃制品。採用精密模壓技術製造的非球面透鏡通常不用再進行研磨拋光，從而降低了成本，提高了產率。在進行精密模壓成型時，為了將高精密的模面複製在玻璃成型品上，需要在高溫下加壓成型玻璃預製體，這時成型模暴露在高溫中且被施以較高的壓力，即使處於保護氣氛中，壓型模具表面模層依然容易被氧化侵蝕。精密模壓成型中，如果頻繁的更換價格不菲的高精度模具，就不能實現低成本高產率的目的。為了延長模具的使用壽命，減少高溫環境對成型模具的損傷，則需要盡可能的降低壓型溫度。因此，開發具有盡可能低的轉變溫度（Tg）的光學玻璃就成了光學材料開發人員的目標。In aspherical forming, a common method is precision molding. The so-called precision molding is to mold a glass preform with a high-precision mold having a predetermined product shape under a certain temperature and pressure, thereby obtaining a glass product having a final product shape and having an optical functional surface. Aspherical lenses made with precision molding technology usually do not need to be polished and polished, thereby reducing costs and increasing productivity. In the case of precision press molding, in order to reproduce a high-precision die face on a glass molded article, it is necessary to press-form the glass preform at a high temperature, and the molding die is exposed to a high temperature and is subjected to a high pressure even if it is at a high temperature. In the protective atmosphere, the surface mold layer of the press mold is still easily oxidized and eroded. In precision molding, if the high-precision mold with high cost is frequently replaced, the purpose of low cost and high productivity cannot be achieved. In order to prolong the service life of the mold and reduce the damage of the molding mold in the high temperature environment, it is necessary to reduce the molding temperature as much as possible. Therefore, the development of optical glass with the lowest possible transition temperature (Tg) has become the goal of optical material developers.
綜上所述，在光學玻璃行業中，從光學設計的有用性的觀點看，非常需要具有高折射率和具有低色散、低轉變溫度的適於精密模壓成型的光學玻璃。In summary, in the optical glass industry, from the viewpoint of the usefulness of optical design, an optical glass suitable for precision press molding having a high refractive index and having a low dispersion and a low transition temperature is highly desired.
日本專利申請特許公開2002-128539公開了一種高折射、低色散的光學玻璃，由於玻璃中不含或者只含少量的ZnO或者F-等能有效降低玻璃化轉變溫度的組分，因此這種玻璃的玻璃化轉變溫度（Tg）高，不適合用作模壓成型。Japanese Patent Application Laid-Open No. 2002-128539 discloses a high-refraction, low-dispersion optical glass which has a composition which can effectively lower the glass transition temperature because it does not contain or contains only a small amount of ZnO or F- . It has a high glass transition temperature (Tg) and is not suitable for use as a press molding.
本發明所欲解決的問題是提供一種高折射、低色散的精密模壓用光學玻璃，以及由該光學玻璃構成的預製件、光學元件和光學儀器。The problem to be solved by the present invention is to provide an optical glass for precision molding having high refraction and low dispersion, and a preform, an optical element, and an optical instrument composed of the optical glass.
本發明解決問題之技術手段是：精密模壓用光學玻璃，其重量百分比組成含有：SiO21～10%、B2O310～25%、La2O315～35%、Gd2O310～35%、ZnO 1～20%，LaF3、GdF3和YF3中的至少一種，其折射率為1.75～1.82，阿貝數為45～52。The technical means for solving the problem of the present invention is: optical glass for precision molding, the composition of which comprises: SiO 2 1 to 10%, B 2 O 3 10 to 25%, La 2 O 3 15 to 35%, Gd 2 O 3 10 to 35%, ZnO 1 to 20%, and at least one of LaF 3 , GdF 3 and YF 3 has a refractive index of 1.75 to 1.82 and an Abbe number of 45 to 52.
進一步的，其重量百分比組成為：SiO21～10%、B2O310～25%、La2O315～35%、Gd2O310～35%、LaF30～15%、GdF30～12%、YF31～10%、Ta2O50～10%、ZnO 1～20%、ZrO20～10%、Li2O 0～5%、Sb2O30～1%。Further, the composition by weight percentage is: SiO 2 1 to 10%, B 2 O 3 10 to 25%, La 2 O 3 15 to 35%, Gd 2 O 3 10 to 35%, LaF 3 0 to 15%, GdF 3 0 to 12%, YF 3 1 to 10%, Ta 2 O 5 0 to 10%, ZnO 1 to 20%, ZrO 2 0 to 10%, Li 2 O 0 to 5%, and Sb 2 O 3 0 to 1%.
進一步的，其中：SiO24～10%。Further, wherein: SiO 2 is 4 to 10%.
進一步的，其中：La2O320～30%、Gd2O315～30%。Further, among them, La 2 O 3 is 20 to 30%, and Gd 2 O 3 is 15 to 30%.
進一步的，其中：B2O312～22%。Further, wherein: B 2 O 3 is 12 to 22%.
進一步的，其中：Ta2O51～5%、ZrO21～5%。Further, among them, Ta 2 O 5 is 1 to 5%, and ZrO 2 is 1 to 5%.
進一步的，其中：LaF35～13%。Further, wherein: LaF 3 is 5 to 13%.
進一步的，其中：LaF3+GdF3+YF35～27%。Further, wherein: LaF 3 + GdF 3 + YF 3 5 to 27%.
進一步的，其中：YF33～8%。Further, wherein: YF 3 is 3 to 8%.
進一步的，其中：ZnO 3～12%。Further, wherein: ZnO is 3 to 12%.
進一步的，其中：Li2O0.5～3%。Further, wherein: Li 2 O is 0.5 to 3%.
進一步的，其中：（Li2O +ZnO）/ F-為0.5～4。Further, wherein: (Li 2 O +ZnO) / F - is from 0.5 to 4.
精密模壓用光學玻璃，其重量百分比組成為：SiO21～10%、B2O310～25%、La2O315～35%、Gd2O310～35%、LaF30～15%、GdF30～12%、YF31～10%、Ta2O50～10%、ZnO 1～20%、ZrO20～10%、Li2O 0～5%、Sb2O30～1%。The optical glass for precision molding has a weight percentage composition of SiO 2 of 1 to 10%, B 2 O 3 of 10 to 25%, La 2 O 3 of 15 to 35%, Gd 2 O 3 of 10 to 35%, and LaF 3 0 to 15%, GdF 3 0 to 12%, YF 3 1 to 10%, Ta 2 O 5 0 to 10%, ZnO 1 to 20%, ZrO 2 0 to 10%, Li 2 O 0 to 5%, Sb 2 O 3 0 to 1%.
進一步的，其中：SiO24～10%。Further, wherein: SiO 2 is 4 to 10%.
進一步的，其中：La2O320～30%、Gd2O315～30%。Further, among them, La 2 O 3 is 20 to 30%, and Gd 2 O 3 is 15 to 30%.
進一步的，其中：B2O312～22%。Further, wherein: B 2 O 3 is 12 to 22%.
進一步的，其中：Ta2O51～5%、ZrO21～5%。Further, among them, Ta 2 O 5 is 1 to 5%, and ZrO 2 is 1 to 5%.
進一步的，其中：LaF35～13%。Further, wherein: LaF 3 is 5 to 13%.
進一步的，其中：LaF3+GdF3+YF35～27%。Further, wherein: LaF 3 + GdF 3 + YF 3 5 to 27%.
進一步的，其中：YF33～8%。Further, wherein: YF 3 is 3 to 8%.
進一步的，其中：ZnO 3～12%。Further, wherein: ZnO is 3 to 12%.
進一步的，其中：Li2O0.5～3%。Further, wherein: Li 2 O is 0.5 to 3%.
進一步的，其中：（Li2O +ZnO）/ F-為0.5～4。Further, wherein: (Li 2 O +ZnO) / F - is from 0.5 to 4.
進一步的，所述玻璃的轉變溫度為590℃以下。Further, the transition temperature of the glass is 590 ° C or lower.
採用上述的精密模壓用光學玻璃製成的玻璃預製件。The glass preform made of the optical glass for precision molding described above is used.
採用上述的精密模壓用光學玻璃製成的光學元件。The optical element made of the optical glass for precision molding described above is used.
採用上述的精密模壓用光學玻璃製成的光學儀器。The optical instrument made of the optical glass for precision molding described above is used.
本發明對照先前技術之功效是：採取與稀土元素結合的方式引入F-，可以達到本發明所要求的低色散性能，同時提高玻璃的均勻性和一致性；通過合理設計Li2O、ZnO、F-的組合比例，可以有效提升本發明玻璃的穩定性，提高玻璃的品質水準，降低本發明玻璃的轉變溫度，以利於模壓成型。本發明通過合理的組分設計，可以得到一種折射率為1.75～1.82、阿貝數為45～52、玻璃的轉變溫度為590℃以下、密度為5.2以下且化學穩定性DW達到1級的精密模壓用光學玻璃。The effect of the present invention against the prior art is that the introduction of F - in combination with rare earth elements can achieve the low dispersion performance required by the present invention, and at the same time improve the uniformity and consistency of the glass; by rationally designing Li 2 O, ZnO, The combination ratio of F - can effectively improve the stability of the glass of the invention, improve the quality level of the glass, and lower the transition temperature of the glass of the invention to facilitate molding. According to the invention, a reasonable composition design can obtain a refractive index of 1.75 to 1.82, an Abbe number of 45 to 52, a glass transition temperature of 590 ° C or less, a density of 5.2 or less, and a chemical stability D W of 1 grade. Optical glass for precision molding.
下面將描述本發明光學玻璃的各個組分，除非另有說明，各個組分含量的比值是用重量%表示。The respective components of the optical glass of the present invention will be described below, and the ratio of the contents of the respective components is expressed by weight% unless otherwise stated.
SiO2是形成玻璃的網路生成體氧化物，加入一定量的SiO2可增大玻璃的高溫粘度，提高玻璃的耐失透性能。當其含量低於1%時，效果不充分；當其含量高於10%時，玻璃的熔融性變差，氣泡難以消除。因此，SiO2的含量限定為1～10%，更優選含量為4～10%，最優選含量是6～9%。SiO 2 is a network-forming oxide that forms glass. The addition of a certain amount of SiO 2 increases the high-temperature viscosity of the glass and improves the devitrification resistance of the glass. When the content is less than 1%, the effect is insufficient; when the content is more than 10%, the meltability of the glass is deteriorated, and the bubbles are difficult to be eliminated. Therefore, the content of SiO 2 is limited to 1 to 10%, more preferably 4 to 10%, and most preferably 6 to 9%.
B2O3也是玻璃網路生成體氧化物，尤其是在高折射、低色散的鑭系光學玻璃中，B2O3是得到穩定玻璃的主要組分。當B2O3含量低於10%時，難以獲得性質穩定的玻璃，耐失透性能不理想；但當B2O3含量高於25%時，玻璃的折射率達不到設計目標，同時玻璃的化學穩定性會降低。由此，將B2O3的含量限定為10～25%，更優選含量是12～22%，最優選含量為15～20%。B 2 O 3 is also a glass network-forming body oxide, especially in a high-refraction, low-dispersion lanthanide optical glass, and B 2 O 3 is a main component for obtaining a stable glass. When the B 2 O 3 content is less than 10%, it is difficult to obtain a glass with stable properties, and the devitrification resistance is not satisfactory; but when the B 2 O 3 content is higher than 25%, the refractive index of the glass does not reach the design goal, and at the same time The chemical stability of the glass is reduced. Thus, the content of B 2 O 3 is limited to 10 to 25%, more preferably 12 to 22%, and most preferably 15 to 20%.
La2O3是高折射、低色散光學玻璃的主要成分，可以增加玻璃的折射率且不明顯提高玻璃的色散，在本發明配方體系中，B2O3與La2O3的共同存在，可以有效地提高玻璃的耐失透性能，提高玻璃的化學穩定性。但當La2O3的含量低於15%時，不能獲得以上的效果，但當其含量超過35%時，玻璃的析晶性能惡化，故將其含量限定為15～35%，更優選的含量為20～30%，最優選的含量為20～28%。La 2 O 3 is a main component of high refractive, low dispersion optical glass, which can increase the refractive index of glass and does not significantly increase the dispersion of glass. In the formulation system of the present invention, B 2 O 3 and La 2 O 3 coexist. It can effectively improve the devitrification resistance of glass and improve the chemical stability of glass. However, when the content of La 2 O 3 is less than 15%, the above effects are not obtained, but when the content exceeds 35%, the crystallization property of the glass is deteriorated, so the content thereof is limited to 15 to 35%, more preferably The content is 20 to 30%, and the most preferable content is 20 to 28%.
Gd2O3可以增加玻璃的折射率且不明顯提高玻璃的色散，可以有效地提高玻璃的耐失透性能，提高玻璃的化學穩定性。用一定量的Gd2O3與 La2O3混熔，可以提高玻璃的耐失透性能。但Gd2O3含量低於10%時效果不甚明顯，含量高於35%時反而會使得玻璃的耐失透性能惡化，因此將Gd2O3的含量限定為10～35%，更優選的含量是15～30%，最優選的含量是20～27%。Gd 2 O 3 can increase the refractive index of the glass and does not significantly increase the dispersion of the glass, which can effectively improve the devitrification resistance of the glass and improve the chemical stability of the glass. By blending a certain amount of Gd 2 O 3 with La 2 O 3 , the devitrification resistance of the glass can be improved. However, when the content of Gd 2 O 3 is less than 10%, the effect is not obvious. When the content is higher than 35%, the devitrification resistance of the glass is deteriorated, so the content of Gd 2 O 3 is limited to 10 to 35%, more preferably. The content is 15 to 30%, and the most preferred content is 20 to 27%.
F-以LaF3、GdF3、YF3等稀土氟化物的方式引入。LaF3、GdF3能有效地調節玻璃的光學常數，但其含量過高工藝難度增加，耐失透性能降低，所以LaF3的優選含量是0～15%，GdF3的優選含量是0～12%；YF3在玻璃中可有效調節玻璃光學常數，相對於LaF3、GdF3，YF3具有成本低且相對最穩定地引入本發明所需的F-的優點，但其含量太低達不到以上效果，含量過高會影響玻璃的耐失透性。因此YF3含量範圍為1～10%，優選為3～8%。而且本發明人通過的大量實驗還發現，當LaF3+GdF3+YF3合計總含量在5～27%時，有益效果更明顯，更優選的合計含量範圍為7～24%，最優選的合計含量為8～15%。F - is introduced as a rare earth fluoride such as LaF 3 , GdF 3 or YF 3 . LaF 3 and GdF 3 can effectively adjust the optical constant of glass, but the content is too high, the process difficulty is increased, and the devitrification resistance is lowered. Therefore, the preferred content of LaF 3 is 0 to 15%, and the preferred content of GdF 3 is 0 to 12. %; YF 3 can effectively adjust optical constants of the glass in the glass, with respect LaF 3, GdF 3, YF 3 has a relatively low cost and stably introduced most required in the present invention F - advantages, too low an amount of not To the above effect, the excessive content will affect the resistance to devitrification of the glass. Therefore, the YF 3 content is in the range of 1 to 10%, preferably 3 to 8%. Moreover, the experiments conducted by the present inventors have also found that when the total content of LaF 3 + GdF 3 + YF 3 is 5 to 27%, the beneficial effect is more remarkable, and the more preferable total content is in the range of 7 to 24%, most preferably The total content is 8 to 15%.
本發明中，優選F-含量範圍為2～7%。當F-含量不足2%時，低色散性能難以達到，但當其含量高於7%時，玻璃工藝難度增加，易在成型的玻璃塊料中產生條紋，同時影響玻璃的均勻性和一致性。In the present invention, the F - content is preferably in the range of 2 to 7%. When the F - content is less than 2%, low dispersion performance is difficult to achieve, but when the content is higher than 7%, the glass process difficulty is increased, and it is easy to generate streaks in the formed glass block, and at the same time affect the uniformity and consistency of the glass. .
ZrO2能提高玻璃的黏度、硬度、化學穩定性，降低玻璃的熱膨脹係數。ZrO2的含量超過10%時玻璃難熔，易失透，而且玻璃化學穩定性惡化。因此ZrO2的含量優選為0～10%，更優選為1～5%。ZrO 2 can improve the viscosity, hardness and chemical stability of glass and reduce the thermal expansion coefficient of glass. When the content of ZrO 2 exceeds 10%, the glass is refractory, easily devitrified, and the chemical stability of the glass is deteriorated. Therefore, the content of ZrO 2 is preferably from 0 to 10%, more preferably from 1 to 5%.
Ta2O5是賦予光學玻璃高折射和低色散特性的組分，可以有效增強玻璃穩定性，Ta2O5含量高，玻璃成本升高。因此Ta2O5的含量優選為0～10%，更優選為1～5%。Ta 2 O 5 is a component which imparts high refraction and low dispersion characteristics to the optical glass, can effectively enhance the stability of the glass, has a high Ta 2 O 5 content, and has an increased glass cost. Therefore, the content of Ta 2 O 5 is preferably from 0 to 10%, more preferably from 1 to 5%.
ZnO可以降低玻璃的轉變溫度。本發明人還發現，在本發明配方體系中，適量引入ZnO可起到提高玻璃耐失透性能的作用，提高高折射低色散組分La2O3、Gd2O3的引入量，同時達到所需光學常數以及降低玻璃熔融溫度的優異發明效果。但當其含量不足1%時，達不到發明效果；若其含量超過20%，玻璃耐失透性和化學穩定性變差，因此ZnO的含量優選為1～20%，更優選為3～12%。ZnO can lower the transition temperature of the glass. The present inventors have also found that in the formulation system of the present invention, an appropriate amount of ZnO can be used to improve the devitrification resistance of the glass, and the introduction amount of the high refractive low dispersion components La 2 O 3 and Gd 2 O 3 can be improved. The desired optical constant and the excellent inventive effect of lowering the glass melting temperature. However, when the content is less than 1%, the effect of the invention is not obtained; if the content exceeds 20%, the devitrification resistance and chemical stability of the glass are deteriorated, so the content of ZnO is preferably from 1 to 20%, more preferably from 3 to ～. 12%.
RO組分能有效調整玻璃光學常數，其中，RO代表BaO、CaO和SrO中的一種或多種。因此，RO含量優選控制在8%以下，更優選5%以下，最優選不加入。The RO component can effectively adjust the optical constant of the glass, wherein RO represents one or more of BaO, CaO and SrO. Therefore, the RO content is preferably controlled to be 8% or less, more preferably 5% or less, and most preferably not added.
Li2O可以有效降低玻璃轉變溫度以及玻璃生產時的熔融溫度，同時還起到降低玻璃密度的有益效果，但當其含量不足0.3%時效果不明顯，含量過高時又會使玻璃的耐失透性惡化，光學常數難以達到目標，所以Li2O的優選含量為0～5%，更優選為0.5～3%。Li 2 O can effectively reduce the glass transition temperature and the melting temperature of the glass production, and also has the beneficial effect of reducing the glass density, but when the content is less than 0.3%, the effect is not obvious, and when the content is too high, the glass resistance is The devitrification property is deteriorated, and the optical constant is difficult to achieve the target. Therefore, the content of Li 2 O is preferably 0 to 5%, more preferably 0.5 to 3%.
發明人通過積極研究發現，通過Li20、ZnO和F-的優化組合既可以達到高折射低色散的目標光學常數，有效降低玻璃的轉變溫度，還可以大大改善玻璃的化學穩定性，降低玻璃的熔融溫度，有效減少F-的揮發從而獲得高品質的玻璃材料。（Li2O+ZnO）/F-值為0.5～4時可以獲得上述發明效果，更優選比值為1.5～3，最優選比值為1.8～2.5。The inventors have found through active research that the optimized optical combination of Li 2 0, ZnO and F − can achieve the target optical constant of high refraction and low dispersion, effectively reduce the glass transition temperature, and can greatly improve the chemical stability of the glass and reduce the glass. melting temperature effective to reduce F - volatilized to obtain a high-quality glass material. When the (Li 2 O+ZnO)/F - value is 0.5 to 4, the effects of the above invention can be obtained, and the ratio is more preferably 1.5 to 3, and most preferably the ratio is 1.8 to 2.5.
可選地，在玻璃熔融過程中可以加入Sb2O3作為玻璃的澄清劑，含量一般為0～1%，含量過高則極大地損壞鉑金器皿。Alternatively, Sb 2 O 3 may be added as a clarifying agent for the glass during the melting of the glass, and the content is generally 0 to 1%. If the content is too high, the platinum vessel is greatly damaged.
下面將描述本發明精密模壓光學玻璃的性能。The properties of the precision molded optical glass of the present invention will be described below.
其中折射率（nd）值為（-2℃/h）～（-6℃/h）的退火值，折射率與阿貝數按照《GB/T 7962.1—1987 無色光學玻璃測試方法 折射率和色散係數》測試。The refractive index (nd) value is (-2 ° C / h) ~ (-6 ° C / h) annealing value, refractive index and Abbe number according to GB/T 7962.1-1987 colorless optical glass test method refractive index and dispersion Coefficient test.
轉變溫度（Tg）按照《GB/T7962.16-1987 無色光學玻璃測試方法線膨脹係數、轉變溫度和弛垂溫度》測試，即：被測樣品在一定的溫度範圍內，溫度每升高1℃，在被測樣品的膨脹曲線上，將低溫區域和高溫區域直線部分延伸相交，其交點所對應的溫度。The transition temperature (Tg) is tested in accordance with GB/T7962.16-1987 Colorless Optical Glass Test Method for Linear Expansion Coefficient, Transition Temperature and Relaxation Temperature, ie, the measured sample is within a certain temperature range, and the temperature is increased by 1 °C. On the expansion curve of the sample to be tested, the linear portion of the low temperature region and the high temperature region are extended to intersect, and the temperature corresponding to the intersection point.
密度按照《GB/T7962.20-1987無色光學玻璃測試方法 密度測試方法》測試。The density is tested in accordance with GB/T7962.20-1987 Colorless Optical Glass Test Method Density Test Method.
耐水作用穩定性DW（粉末法）按GB/T17129的測試方法，根據下式計算：Water resistance stability D W (powder method) according to the test method of GB/T17129, according to the following formula:
DW=（B-C）/（B-A）*100D W =(BC)/(BA)*100
式中：DW—玻璃浸出百分數（%）Where: D W - percentage of glass leaching (%)
B—過濾器和試樣的質量（g）B—quality of filter and sample (g)
C—過濾器和侵蝕後試樣的質量（g）C—the quality of the filter and the sample after erosion (g)
A—過濾器質量（g）A—filter quality (g)
由計算得出的浸出百分數，將光學玻璃耐水作用穩定DW分為6類見下表。From the calculated percentage of leaching, the water resistance of the optical glass is stabilized, D W is classified into 6 categories as shown in the following table.
光學玻璃短波透射光譜特性用著色度（λ80/λ5）表示。樣品厚度10mm±0.1mm, λ80是指玻璃透射比達到80%時對應的波長,λ5是指玻璃透射比達到5%時對應的波長。並以10nm為單位表示。The short-wave transmission spectral characteristics of the optical glass are represented by the degree of coloration (λ 80 /λ 5 ). The sample thickness is 10 mm ± 0.1 mm, λ 80 is the wavelength corresponding to the glass transmittance of 80%, and λ 5 is the wavelength corresponding to the glass transmittance of 5%. And expressed in units of 10 nm.
實施例Example
下面將描述本發明精密模壓光學玻璃的實施例。需要強調的是，這些實施例沒有限制本發明的保護範圍。An embodiment of the precision molded optical glass of the present invention will be described below. It should be emphasized that these examples do not limit the scope of the invention.
表1-表3中顯示的光學玻璃（實施例1～30）是通過按照表1～3所示各個實施例的比值稱重並混合光學玻璃用普通原料製備的，這些原料如氧化物、氫氧化物、碳酸鹽、硝酸鹽和氟化物，將混合原料放置在鉑金坩堝中，在1100-1300℃的溫度內熔融2-5小時，並且在澄清和為了均化而進行的攪拌之後，將熔融物在模具內鑄型並退火。The optical glasses (Examples 1 to 30) shown in Tables 1 to 3 were prepared by weighing and mixing the raw materials for optical glass according to the ratios of the respective examples shown in Tables 1 to 3, such as oxides and hydrogen. Oxides, carbonates, nitrates and fluorides, the mixed raw materials are placed in a platinum crucible, melted at a temperature of 1100-1300 ° C for 2-5 hours, and melted after clarification and stirring for homogenization The material is cast in a mold and annealed.
本發明實施例（1～30）的組成與折射率（nd）、阿貝數（vd）、玻璃轉變溫度（Tg）、密度（ρ）、耐水作用穩定性（DW）以及著色度（λ80/λ5）的結果一起在表1～表3中表示。在這些表中，各個組分的組成是用重量百分比表示的。Composition (1) of the present invention (1 to 30) and refractive index (nd), Abbe number (vd), glass transition temperature (Tg), density (ρ), water resistance stability (D W ), and chromaticity (λ) The results of 80 / λ 5 ) are shown together in Tables 1 to 3. In these tables, the composition of each component is expressed in weight percent.
【表1】【Table 1】
【表2】【Table 2】
【表3】【table 3】
從上述實施例可以看出，本發明實施例提供的光學玻璃折射率為1.75～1.82，阿貝數為45～52，Tg為590℃以下，密度為5.2以下，化學穩定性DW達到1級，適用於精密壓型用。It can be seen from the above embodiments that the optical glass provided by the embodiment of the present invention has a refractive index of 1.75 to 1.82, an Abbe number of 45 to 52, a Tg of 590 ° C or less, a density of 5.2 or less, and a chemical stability D W of 1 grade. Suitable for precision molding.
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