TW200948735A

TW200948735A - Optical glass

Info

Publication number: TW200948735A
Application number: TW98106491A
Authority: TW
Inventors: Hiroyuki Ohkawa; Yuki Kondo; Tomoharu Hasegawa
Original assignee: Asahi Glass Co Ltd
Priority date: 2008-02-28
Filing date: 2009-02-27
Publication date: 2009-12-01
Also published as: JPWO2009107612A1; WO2009107612A1

Abstract

Disclosed is an optical glass which contains, in mol% based on oxides, 20-50% of Bi2O3, 15-35% of B2O3, 0-30% of SiO2, 0.1-15% of TiO2, 0.1-30% of TeO2, 0-15% of P2O5, 0-10% of Al2O3 and 0-15% of ZnO. By having such a constitution, the optical glass has high refractive index, high dispersion and high light-transmitting characteristics.

Description

200948735 六、發明說明：【發明所屬之技術領域】本發明係關於一種折射率高且透光性優良、亦可精密壓製成形之絲系光學玻璃。【先前技術】作為不含鉛之高折射率、高分散區域之光學玻璃，於專利文獻1及專利文獻2中提出有以磷酸鹽為基質之系。矣中，折射率（nd)超過2.0之具體組成僅提出於專利文獻2之參實施例12及13中’且被認為係特定透射率波長（70%透射率）之值較差等、透射率特性較差者。通常，折射率與透光特性存在當提高其中一方時另—方會降低之折衷^如 off)關係’因此於具有高折射率之光學玻璃中，確保透光特性亦非常重要。又，該等破璃之心均為45〇它以上故有可能導致熱成形過程中，對模具之負荷以及能量成本增大0 作為折射率（nd)超過2.G之高折射率光學玻璃，於專利文獻3與專利文獻4中提出有以Bi2〇3為主成分之㈣光學玻璃。叙系玻璃於達到高折射率時，具有可見光範圍内之透明性、即透光特性會降低之傾向，故折射率與透光特性之兼顧非常重要。、低變形點、不含於專利文獻3中提出有滿足高折射率錯此三個條件之㈣光學玻璃，但就透光特性方面而言，卻未必能充分滿足。又，於專利讀4巾，雖提出有旨在兼顧高折射率與高透光特性之_光學玻璃，但未必充 138856.doc 200948735 分。又’由於含有大量鹼性成分、鹼土類成分等，故熱膨脹係數較大，當進行壓製成形等之成形時，除了容易產生因熱衝擊而導致之龜裂、破損等之成形不良以外，亦可能導致成為成品之光學元件的形狀精度降低。因此，至今仍未提出有充分實現高折射率、高透光特性及低熱膨脹係數之光學玻璃。 [專利文獻1]曰本專利特開2003-321245號公報 [專利文獻2]日本專利特開2006-111499號公報 [專利文獻3]日本專利特開2002-201039號公報 [專利文獻4]日本專利特開2006-327926號公報【發明内容】 [發明所欲解決之問題] 本發明之目的在於提供一種可製造折射率高、透光特性優良、易於成形且尺寸精度高之光學元件之光學玻璃。 [解決問題之技術手段] 本發明提供一種光學玻璃，以氧化物為基準且以m〇l〇/0 計’其含有20〜50%之Bi203、15〜35%之B2〇3、0〜30%之 Si〇2、0.1 〜15%之 Ti02、0.1 〜30%之 Te02、〇~15%之 P205、〇〜10%之Al2〇3以及〇〜15%之ZnO。 [發明之效果] 本發明之鉍系光學玻璃（以下稱為本玻璃）以Bi2〇3、 B2〇3、丁i〇2及Te〇2作為必須成分。藉由本玻璃，由於折射率高且透光特性優良’故而可提高色再現性、可使用大口徑之厚透鏡、可組合複數個透鏡等，提高透鏡設計之自由 138856.doc -4 - 200948735 度。藉由本玻璃，玻璃轉移溫度（Tg)可為450°C以下，故而可減輕通常形成於模具表面之保護膜或離型膜之劣化程度，其結果為模具之耐久性得到改善，生產率得到大幅提高。又，藉由本玻璃，由於熱膨脹係數小於先前之鉍系光學玻璃，故容易獲得除可抑制凹痕或因熱衝擊而導致之龜裂、破損等之成形不良以外，形狀精度亦優良之成形品 (成品），因而若使用本玻璃，則生產率將得到提高。【實施方式】本發明係以提供折射率高、透光特性優良且易於成形之鉍系光學玻璃為目的，且基於為兼顧鉍系光學玻璃之高折射率與高透光特性而進行各種研究所得之結果者。研究結果發現，藉由均衡地含有Te〇2等，可達成本目的。再者，P2〇5雖亦係可提高透光特性之成分，但亦係會藉由添加而使折射率降低之成分，因此較好的是一面考慮特性之平衡，一面進行添加。本玻璃之特徵在於含有出203、ΙΟ3、Ti02及Te02。設定本玻璃之各成分範圍之理由如下所述。再者，於本說明書中，除内部透射率以外，以下但凡無特別聲明則％均係指mol%。又，化學組成設為基於氧化物。於本玻璃中’ B地係必須之成分，有使玻璃高折射率化且使玻璃軟化之效果。當含量過少時，有可能導致上述 f果不充分，因此本玻璃之則2〇3含量為2〇%以上。較好的疋Bl203含量為3〇%以上，更好的是則2〇3含量為训以上。 13S856.doc 200948735 另一方面’當Bi2〇3含量增多時，可見光範圍之透光特性會降低’且玻璃會變得不穩定，因此本玻璃之Bi2〇3含量為50。/。以下。較好的是βϊ2〇3含量為48%以下，更好的是 Biz〇3含量為46%以下》特別好的是則2〇3含量為44%以下。於本玻璃中’ B2〇3係必須之成分，係形成玻璃之主成分。當含量過少時，有可能導致玻璃變得不穩定，因此本玻璃之Βζ〇3含量為ι5%以上。較好的是b2〇3含量為16%以上’更好的是B2〇3含量為18%以上。另一方面，當b2〇3含量過多時折射率會降低’因此於本玻璃中，含量為 350/。以下。較好的是ία含量為34%以下，更好的是ΙΑ 含量為33%以下。特別好的是β2〇3含量為32%以下。於本玻璃中’ Si〇2並非必須之成分’但係形成玻璃之主成分。當添加Si〇2時，就玻璃之穩定性與折射率方面考慮’較好的是將Si〇2含量設為30%以下《更好的是將Si〇2 含量設為28%以下，特別好的是Si〇2含量為25%以下。於本玻璃中，就玻璃之穩定性與折射率之平衡考慮，較好的是將本玻璃之1〇3與Si〇2之總量設為15%以上，更好的是BzO3與Si〇2之總量為20%以上，特別好的是B2〇3與 Si02之總量為22%以上。另一方面，當Βζ〇3與Si〇2之總量增大時折射率降低，因此較好的是本玻璃之Βζ〇3與Si〇2之總量為45%以丁。更好的是1〇3與Si〇2之總量為40%以下，特別好的是1〇3與 Si02之總量為33%以下。於本玻璃中，Ti〇2係必須之成分，有提高玻璃之折射率 138856.doc 200948735 之效果《當含量過少時，有可能導致上述效果不充分，因此本玻璃之Τι〇2含量為0.1。/。以上。較好的是Ti〇2含量為3% 以上，更好的是Ti〇2含量為6%以上。特別好的是丁丨〇2含量為9%以上。另一方面’當Ti〇2之含量增多時’玻璃會變得不穩定，且可見光範圍之透光特性會降低，因此Ti〇2之含量為15% 以下。較好的是Ti〇2含量為14%以下，更好的是τί〇2含量為13%以下。特別好的是Ti〇2含量為12%以下。於本玻璃中’ Te〇2係必須之成分，有提高透光特性且提高玻璃之折射率之效果。當含量過少時，有可能導致上述效果不充分’因此本玻璃之Te〇2含量為〇.1 %以上。較好的是Te〇2含量為2%以上，更好的是Te02含量為5%以上。特別好的是Te02含量為8%以上。另一方面’當Te〇2含量增多時，有可能導致玻璃不穩定化’因此Te〇2含量設為30%以下。較好的是Te02含量設為 25%以下’更好的是Te〇2含量設為23%以下。特別好的是 Te02含量設為20%以下。於本玻璃中’ 1»2〇5並非必須之成分，但係形成玻璃之成分（玻璃形成氧化物）。並且，P2〇5係提高透光特性之成分之一。於本玻璃中，當Ρζ〇5含量過少時，有可能導致提高透光特性之效果減小，因此於本玻璃中，較好的是ρ2〇5含量為0.1%以上。又，更好的是Ρ2〇5含量為2%以上，進而更好的是Ρζ〇5含量為4%以上。特別好的是ρ2〇5含量為6% 以上。 138856.doc 200948735 另一方面’當P2〇5含量增多時，折射率會下降，且玻璃會變得不穩定’因此於本玻璃中，P2〇5含量為15%以下。較好的是P2〇5含量為12°/。以下’更好的是p2〇5含量為10〇/〇以下。特別好的是P2〇5含量為8%以下。於本玻璃中’ Al2〇3並非必須之成分，但具有使玻璃穩定化之效果。當含有八丨2〇3時，為了容易獲得使玻璃穩定化之效果’較好的是將Al2〇3含量設為〇·1%以上。另一方面’當Al2〇3含量增多時，折射率會降低，因此較好的是將Ah〇3含量設為1〇%以下，更好的是將Al2〇3含量設為3%以下。進而更好的是將Al2〇3含量設為1%以下，特別好的是將Al2〇3含量設為05%以下。於本玻璃中，Ζη〇並非必須之成分，但係具有一面使玻璃穩定化一面提高折射率之效果之成分。另一方面，當含量過多時，分散會變大，耐化學性亦會降低，因此當含有 Ζη〇時，較好的是將Ζη〇含量設為15°/。以下，更好的是ΖηΟ 含量為13°/❶以下，特別好的是Ζη〇含量為12%以下。於本破璃中’可含有Ge〇2、〇&2〇3或(^〇2之各成分來作為用以調節光學特性之任意成分。但是，該等各成分價格較间’故而工業上較理想的是實質上不含有Ge〇2、Ga2〇3 或Ce〇2中之至少1種成分。所謂實質上不含有，於本說明書中係指含量為0.05%以下。更好的是Ge〇2、&2〇3及 Ce〇2此三種成分實質上均不含有。、本坡璃中，為了調節光學特性，亦可含有Li20、 Na_2〇、欠 ο。a 2 疋’該等成分會增大光學玻璃之熱膨脹係 138856.doc 200948735 數’故而除於成形時難以獲得尺寸精度以外，亦會降低透光特性’故而較好的是將各成分之總量、即、Li2〇+Na2〇 + Κ2〇(以下稱為鹼性成分總量）設為6%以下，更好的是鹼性成分總量為2¼以下，特別好的是鹼性成分總量為〇 5〇/〇以下。於本玻璃中，為了調節光學特性，亦可含有Mg〇、 CaO、SrO、BaO。但是，該等成分會增大光學玻璃之熱膨脹係數，故而除於成形時難以獲得尺寸精度以外，亦會降 _ 低透光特性，故而較好的是將各成分之總量、即、MgO + CaO+SrO+BaO(以下稱為鹼土類成分總量）設為1%以下’ 更好的是鹼土類成分總量為〇_7%以下，特別好的是鹼土類成分總量為0.5%以下。於本玻璃中’為了調節光學特性，可添加Nb2〇5、 W03、ΖΓ〇2、Gd2〇3、La203、γ2〇3中之任i種以上作為任意成分。當含量較少時’幾乎無法獲得光學特性之調節效 _ 果’因此作為含量’較好的是含量分別單獨為〇丨％以上，更好的是上述含量分別單獨為丨％以上，特別好的是上述含量分別單獨為2°/。以上。另一方面，上述各成分基本上並不利於提高透光特性，因此當著重於透光特性時，較好的是儘可能地抑制含量。因此，較好的是分別單獨設為1〇%以下，更好的是分別單獨設為5%以下，特別好的是分別單獨設為4%以下。於本玻璃中，為了調節光學特性，可添加Ta2Os、Yb2〇3 中之任1種以上作為任意成分。當含量較少時幾乎無法 138856.doc 200948735 獲得調以學特性之效果，因此作為含量，較好的是含量分別單獨為(U%以上，更好的是上述含量分別單獨為ι% 以上’特別好的是上述含量分別單獨為2%以上。但是該等成分價格較高，故而工業上較理想的是：素。又’於本玻璃中，就成形溫度之角度、對環境方面之影響等考慮’較好的是實質上不含有pb〇、F、Ah。” 於本玻璃中’ Sb2〇3並非必須之成分，但可作為玻璃溶融時之/a ^劑來添加。作為其含量較好的是以以下，更好的是〇.5%以下，特別好的是0.1%以下。於本玻璃中，添加Sb2〇3時，其含量較好的是〇〇1%以上更好的是 0.05%以上’特別好的是0.1 %以上。於本玻璃中’作為必須成分與任意成分較好的是實質上不含有 Bi2〇3、b2〇3、Si〇2、Ti〇2、Te〇2、p2〇5、BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silk-based optical glass which has a high refractive index and excellent light transmittance and can be precisely press-formed. [Prior Art] As an optical glass having a high refractive index and a high dispersion region which does not contain lead, a phosphate-based system is proposed in Patent Document 1 and Patent Document 2. In the crucible, the specific composition of the refractive index (nd) exceeding 2.0 is only proposed in the reference examples 12 and 13 of Patent Document 2, and is considered to be a value of a specific transmittance wavelength (70% transmittance), etc., and transmittance characteristics. Poor. In general, the refractive index and the light transmissive property have a trade-off relationship that is lowered when one of them is increased. Therefore, in an optical glass having a high refractive index, it is also important to ensure light transmission characteristics. Moreover, these broken glass hearts are all 45 Å or more, which may cause the load on the mold and the energy cost to increase during the hot forming process as a high refractive index optical glass having a refractive index (nd) exceeding 2.G. Patent Document 3 and Patent Document 4 propose a (four) optical glass having Bi2〇3 as a main component. When the refractive index reaches a high refractive index, the transparency in the visible light range, that is, the light transmission property tends to be lowered, so that both the refractive index and the light transmission property are important. The low-deformation point is not included in Patent Document 3, and the optical glass which satisfies the three conditions of high refractive index is proposed, but in terms of light transmission characteristics, it may not be sufficiently satisfied. Moreover, although the patented 4 towel has been proposed to have both high refractive index and high light transmission characteristics, it does not necessarily charge 138856.doc 200948735. In addition, since a large amount of an alkaline component or an alkaline earth component is contained, the coefficient of thermal expansion is large, and when forming by press molding or the like, molding defects such as cracking or breakage due to thermal shock are likely to occur. The shape accuracy of the optical component that becomes the finished product is lowered. Therefore, an optical glass which sufficiently realizes a high refractive index, a high light transmission property, and a low thermal expansion coefficient has not been proposed so far. [Patent Document 1] Japanese Patent Laid-Open No. Hei. No. Hei. No. 2006-111499 (Patent Document 3) Japanese Patent Laid-Open No. Hei. No. 2002-201039 (Patent Document 4) Japanese Patent [Problem to be Solved by the Invention] An object of the present invention is to provide an optical glass which can produce an optical element having a high refractive index, excellent light transmission characteristics, and easy molding and high dimensional accuracy. [Technical means for solving the problem] The present invention provides an optical glass based on an oxide and based on m〇l〇/0, which contains 20 to 50% of Bi203, 15 to 35% of B2〇3, 0 to 30. % of Si〇2, 0.1 to 15% of Ti02, 0.1 to 30% of Te02, 〇~15% of P205, 〇~10% of Al2〇3, and 〇~15% of ZnO. [Effect of the Invention] The bismuth-based optical glass (hereinafter referred to as the present glass) of the present invention contains Bi2〇3, B2〇3, 〇i〇2, and Te〇2 as essential components. The present glass has high refractive index and excellent light transmission characteristics, so that color reproducibility can be improved, a thick lens having a large diameter can be used, a plurality of lenses can be combined, and the like, and the freedom of lens design can be improved by 138856.doc -4 - 200948735 degrees. With the present glass, the glass transition temperature (Tg) can be 450 ° C or less, so that the degree of deterioration of the protective film or the release film which is usually formed on the surface of the mold can be reduced, and as a result, the durability of the mold is improved, and the productivity is greatly improved. . In addition, since the thermal expansion coefficient of the present glass is smaller than that of the conventional bismuth-based optical glass, it is easy to obtain a molded article having excellent shape accuracy in addition to molding defects such as cracking or breakage due to thermal shock. Finished product), so if the glass is used, the productivity will be improved. [Embodiment] The present invention has been made for the purpose of providing a bismuth-based optical glass having a high refractive index, excellent light-transmitting characteristics, and easy molding, and is based on various studies for taking into account the high refractive index and high light-transmitting property of the bismuth-based optical glass. The result. The research found that it is possible to achieve cost by balancing Te〇2 and the like. Further, although P2〇5 is also a component which can improve light transmission characteristics, it is also a component which lowers the refractive index by addition, and therefore it is preferable to add it while considering the balance of characteristics. The present glass is characterized by containing 203, ΙΟ3, TiO2 and Te02. The reason for setting the range of each component of the glass is as follows. Further, in the present specification, except for the internal transmittance, the following is a % by mol unless otherwise stated. Further, the chemical composition is based on an oxide. In the present glass, the components necessary for the B-based system have an effect of making the glass high in refractive index and softening the glass. When the content is too small, the above-mentioned f may be insufficient, and therefore the content of 2〇3 of the present glass is 2% or more. The preferred content of 疋Bl203 is more than 3%, and more preferably, the content of 〇3 is more than training. 13S856.doc 200948735 On the other hand, when the content of Bi2〇3 is increased, the light transmission property in the visible light range is lowered and the glass becomes unstable, so the Bi2〇3 content of the glass is 50. /. the following. It is preferred that the content of βϊ2〇3 is 48% or less, and more preferably, the content of Biz〇3 is 46% or less. Particularly preferably, the content of 2〇3 is 44% or less. In the present glass, the component of the 'B2〇3 system is the main component of the glass. When the content is too small, the glass may become unstable, so the content of ruthenium 3 in the glass is ι5% or more. It is preferred that the b2〇3 content is 16% or more. More preferably, the B2〇3 content is 18% or more. On the other hand, when the content of b2〇3 is too large, the refractive index is lowered. Therefore, in the present glass, the content is 350/. the following. Preferably, the ία content is 34% or less, and more preferably the ΙΑ content is 33% or less. It is particularly preferable that the β2〇3 content is 32% or less. In the present glass, 'Si〇2 is not an essential component' but forms the main component of the glass. When Si〇2 is added, it is preferable to set the Si〇2 content to 30% or less in terms of stability and refractive index of the glass. It is more preferable to set the Si〇2 content to 28% or less, which is particularly preferable. The content of Si〇2 is 25% or less. In the present glass, in consideration of the balance between the stability of the glass and the refractive index, it is preferred to set the total amount of 1〇3 and Si〇2 of the glass to 15% or more, more preferably BzO3 and Si〇2. The total amount is 20% or more, and particularly preferably, the total amount of B2〇3 and SiO2 is 22% or more. On the other hand, when the total amount of Βζ〇3 and Si〇2 is increased, the refractive index is lowered, so it is preferable that the total amount of Βζ〇3 and Si〇2 of the present glass is 45%. More preferably, the total amount of 1〇3 and Si〇2 is 40% or less, and particularly preferably, the total amount of 1〇3 and Si02 is 33% or less. In the present glass, Ti〇2 is a necessary component and has an effect of increasing the refractive index of the glass 138856.doc 200948735. When the content is too small, the above effect may be insufficient, so the content of 玻璃ι〇2 of the glass is 0.1. /. the above. It is preferred that the Ti〇2 content is 3% or more, and more preferably the Ti〇2 content is 6% or more. It is particularly preferable that the content of Dings 2 is 9% or more. On the other hand, when the content of Ti〇2 is increased, the glass becomes unstable, and the light-transmitting property in the visible light range is lowered. Therefore, the content of Ti〇2 is 15% or less. Preferably, the Ti〇2 content is 14% or less, and more preferably the τί〇2 content is 13% or less. It is particularly preferable that the Ti〇2 content is 12% or less. In the present glass, the component of the 'Te〇2 system is required to improve the light transmission property and increase the refractive index of the glass. When the content is too small, the above effect may be insufficient. Therefore, the content of Te〇2 in the present glass is 0.1% or more. It is preferred that the Te〇2 content is 2% or more, and more preferably the Te02 content is 5% or more. Particularly preferably, the Te02 content is 8% or more. On the other hand, when the content of Te〇2 is increased, the glass may be destabilized. Therefore, the Te〇2 content is set to 30% or less. It is preferred that the Te02 content is 25% or less. More preferably, the Te〇2 content is set to 23% or less. Particularly preferably, the Te02 content is set to 20% or less. In the present glass, '1»2〇5 is not an essential component, but forms a glass component (glass forming oxide). Further, P2〇5 is one of the components for improving light transmission characteristics. In the present glass, when the content of cerium 5 is too small, the effect of improving the light transmitting property may be reduced. Therefore, in the present glass, the content of ρ2 〇 5 is preferably 0.1% or more. Further, it is more preferable that the content of Ρ2〇5 is 2% or more, and more preferably, the content of Ρζ〇5 is 4% or more. Particularly preferably, the ρ2〇5 content is 6% or more. 138856.doc 200948735 On the other hand, when the content of P2〇5 is increased, the refractive index is lowered and the glass becomes unstable. Therefore, in the present glass, the P2〇5 content is 15% or less. It is preferred that the P2〇5 content is 12°/. The following 'better' is that the p2〇5 content is 10 〇/〇 or less. It is particularly preferable that the P2〇5 content is 8% or less. In the present glass, 'Al2〇3 is not an essential component, but has an effect of stabilizing the glass. When octagonal 2 〇 3 is contained, in order to easily obtain an effect of stabilizing the glass, it is preferable to set the Al 2 〇 3 content to 〇·1% or more. On the other hand, when the content of Al2〇3 is increased, the refractive index is lowered. Therefore, the content of Ah〇3 is preferably 1% by weight or less, and more preferably the content of Al2〇3 is 3% or less. Further, it is more preferable to set the Al 2 〇 3 content to 1% or less, and it is particularly preferable to set the Al 2 〇 3 content to 05% or less. In the present invention, Ζη〇 is not an essential component, but has a function of increasing the refractive index while stabilizing the glass. On the other hand, when the content is too large, the dispersion becomes large and the chemical resistance is also lowered. Therefore, when Ζη〇 is contained, it is preferred to set the Ζη〇 content to 15 ° /. Hereinafter, it is more preferable that the content of ΖηΟ is 13°/❶ or less, and particularly preferably, the content of Ζη〇 is 12% or less. In the present glass, 'may contain Ge〇2, 〇&2〇3 or (^^2 each component as an arbitrary component for adjusting optical properties. However, the prices of these components are relatively high.) It is preferable that substantially no one of Ge 〇 2, Ga 2 〇 3 or Ce 〇 2 is contained. The term "substantially not contained" means that the content is 0.05% or less in the present specification. More preferably, Ge 〇 2, & 2〇3 and Ce〇2 These three components are not substantially contained. In this slope, in order to adjust the optical properties, Li20, Na_2〇, and οο. a 2 疋' Increasing the thermal expansion coefficient of optical glass 138856.doc 200948735 The number is not difficult to obtain dimensional accuracy in forming, but also reduces the light transmission characteristics. Therefore, it is preferred that the total amount of each component, that is, Li2〇+Na2〇 + Κ2〇 (hereinafter referred to as the total amount of alkaline components) is 6% or less, more preferably the total amount of alkaline components is 21⁄4 or less, and particularly preferably, the total amount of alkaline components is 〇5〇/〇 or less. In the present glass, in order to adjust optical characteristics, Mg〇, CaO, SrO, and BaO may be contained. However, the components are It will increase the thermal expansion coefficient of the optical glass, so that it is difficult to obtain dimensional accuracy in forming, and it will also reduce the low light transmission characteristics. Therefore, it is preferable to add the total amount of each component, that is, MgO + CaO + SrO + BaO. (The total amount of the alkaline earth component is hereinafter referred to as 1% or less.) It is more preferable that the total amount of the alkaline earth component is 〇_7% or less, and particularly preferably, the total amount of the alkaline earth component is 0.5% or less. 'In order to adjust the optical characteristics, any one or more of Nb2〇5, W03, ΖΓ〇2, Gd2〇3, La203, and γ2〇3 may be added as an optional component. When the content is small, adjustment of optical characteristics is hardly obtained. The effect _ fruit 'so as the content' is preferably that the content is 〇丨% or more, and it is more preferable that the above content is 丨% or more, and particularly preferably, the above content is 2°/. or more. On the one hand, the above-mentioned respective components are basically not advantageous for improving the light-transmitting property, and therefore, when focusing on the light-transmitting property, it is preferred to suppress the content as much as possible. Therefore, it is preferable to set them individually to 1% by weight or less. It is better to set them separately to 5% or less. In particular, in the present glass, in order to adjust the optical characteristics, any one or more of Ta2Os and Yb2〇3 may be added as an optional component. When the content is small, it is almost impossible to 138856.doc. 200948735 The effect of adjusting the characteristics of the study is obtained. Therefore, as the content, it is preferable that the content is separately (U% or more, and more preferably, the above content is separately ι% or more). Particularly, the above content is 2% by weight. Above, but the price of these components is relatively high, so the industrially desirable one is: Prime. In the present glass, considering the angle of forming temperature and the influence on the environment, it is preferable that substantially no pb is contained. 〇, F, Ah. In the present glass, 'Sb2〇3 is not an essential component, but it can be added as a /a ^ agent in the case of glass melting. The content is preferably as follows, more preferably 5% or less, especially good. In the present glass, when Sb2〇3 is added, the content thereof is preferably 〇〇1% or more, more preferably 0.05% or more, and particularly preferably 0.1% or more. The essential component and the optional component are preferably substantially free of Bi2〇3, b2〇3, Si〇2, Ti〇2, Te〇2, p2〇5,

Al2〇3 ZnO、Ge〇2、Ga203、Ce〇2、Li2〇、Na20、K20、 MgO、CaO、SrO、BaO、Nb205、w〇3、Zr02、Gd203、Al2〇3 ZnO, Ge〇2, Ga203, Ce〇2, Li2〇, Na20, K20, MgO, CaO, SrO, BaO, Nb205, w〇3, Zr02, Gd203,

La203、Y2〇3、Ta2〇5、Yb2〇3、別2〇3 以外之成分再者，於本說明書中，所謂的實質上不含有，係指除了不可避免地作為雜質而含有者以外。於本玻璃中’作為必須成分與任意成分，更好的是實質上不含有 Bi2〇3、b2〇3、Si〇2 们〇2 Te〇2 p2〇5In addition to the components other than La203, Y2〇3, Ta2〇5, Yb2〇3, and other than 2〇3, the term "substantially not contained in the present specification" means that it is contained in addition to being inevitably contained as an impurity. In the present glass, 'as an essential component and an optional component, it is more preferable that it does not substantially contain Bi2〇3, b2〇3, Si〇2 〇2 Te〇2 p2〇5

Al2〇3、Zn〇、Ge〇2、U2〇、_〇5以外之成分。又’於本玻璃中’較好的是儘可能地減少於可見光範圍内具有光吸收而使透射率降低之Fe等之過渡金屬雜質。於 138856.doc 200948735 本玻璃中，Fe含量以以離子換算，較好的是2〇 ppm以下，更好的是Fe含量為1〇 ppm以下，特別好的是Fe含量為2 ppm以下。本玻璃之成分中，Bb〇3係以基於氧化物之重量％表示占 50%以上之必須成分，因此用作原料之氧化鉍中之以含量以Fe離子換算，較好的是2〇 ppm以下，更好的是Fe含量為 10 ppm以下，特別好的是Fe含量為2 ppm以下。作為本玻璃之光學特性，較好的是折射率（nd)為2〇〇以 ® 上。更好的是本玻璃之折射率（nd)為2 〇5以上，進而更好的是本玻璃之折射率（nd)為2.07以上。更進一步更好的是本玻璃之折射率（nd)為2.10以上。又，較好的是本玻璃之阿貝數（Vd)為2〇以下，更好的是本玻璃之阿貝數（Vd)為18.5以下，特別好的是本玻璃之阿貝數（vd)為18以下。另一方面，由於難以將本玻璃之阿貝數（vd)設為未滿15 ’因此較好的是設為15以上。 _ 於光學玻璃中，特別是於高折射率之情形時，當光之波長自600 nm附近向短波長（紫外線區）侧變化時，透射性具有隨著光之波長變短而急遽降低之傾向。於本說明書中，係根據内部透射率為5%與50%之光的波長值，來評價透光性之傾向。内部透射率為5%、50%之光之波長分別係越向短波長側變化，透光性越好。關於本玻璃之透光特性，當顯示内部透射率5%(以10 mm厚度換算）之波長λ5為430 nm以下時，由於可見光範圍内的短波長侧之透射率得到改善，且色再現性得到提高， 138856.doc 200948735 因而較好’更好的是本玻璃之&為42〇 nm以下，特別好的是本玻璃之λ;為415 nm以下。同様地，關於本玻璃之透光特性’較好的是顯示内部透射率5〇%(以1〇 mm厚度換算）之波長λα為450 nm以下，更好的是本玻璃之人5〇為445 nm# 下’特別好的是本玻璃之λ5()為440 nm以下。再者，於本說明書中，λ5及λ5()係對厚度分別*tl(mm)、 t2(mm)(其中，t2>ti)之式樣測定包含表面損失在内之分光透射率特性，根據其差量，求出之厚度之内部透射率特性’並將其進而以1〇 mm厚度進行換算而得之值。作為t〗、t2之組合’可舉出t1 = l mm、t2 = l〇 mm等作為一例。作為本玻璃之玻璃轉移點（Tg)，當為500eC以下時，可降低成形溫度’提高形成於模具表面之保護膜等之耐久性，因而較好，更好的是本玻璃之玻璃轉移點（Tg)為46〇<)(：以下。特別好的是本玻璃之玻璃轉移點以下。作為本玻璃之熱膨脹係數，於100〜3〇〇°C時之平均線熱膨脹係數(X為90〜110(χ10·ν>〇時，成形時之尺寸精度較好，不易出現成形不良，因而較好。更好的是本玻璃之α 為 95〜105(x10_7/°C )。作為本玻璃之製造方法，並無特別限制，例如可稱量並混合氧化物、氫氧化物、碳酸鹽、硝酸鹽、磷酸鹽等之通常用於光學玻璃中之原料，放入至鉑坩堝、金坩堝、石英坩堝、氧化鋁坩堝等之通常用於光學玻璃中之坩堝内，於大約800〜120(TC下熔融、澄清、攪拌2〜1〇個小時後，澆鑄 138856.doc •12· 200948735 至預熱至300〜450t之模具等之後，加以緩冷而製造。又，作為將本玻璃成形為光學元件之方丁心万忐，並無特別限制，但就本玻璃之玻璃轉移點（Tg)i值而言，若為壓製成形，則可有效發揮材料之特性，因而較好。再者，除壓製成形以外，藉由微細加工，亦可將本玻璃擴展至繞射光學元件、分散補償元件等透鏡以外之用途。 [實施例] 以下，說明本發明之實施例等。例1〜例2係本發明之比較例’例3〜例2 6係本發明之實施例。再者，例1係專利文獻3(日本專利特開2002-201039號公報）中所揭示之實施例之例4 ’例2係作為專利文獻4(曰本專利特開2006-327926 號）之實施例之例30。 [化學組成及試樣製作方法] 以達到表1〜7所示之化學組成（％)之方式來稱量原料。關於各玻璃之原料’ p2〇5之情形時係使用H3p〇4或BP04， B2〇3之情形時係使用h3b〇3或BP04，Li20之情形時係使用Components other than Al2〇3, Zn〇, Ge〇2, U2〇, _〇5. Further, in the present glass, it is preferable to reduce the transition metal impurities such as Fe which have light absorption in the visible light range and lower the transmittance as much as possible. In the present invention, the Fe content is preferably 2 〇 ppm or less in terms of ions, more preferably 1 〇 ppm or less, and particularly preferably 2 ppm or less. In the component of the present invention, Bb〇3 is an essential component in an amount of 50% or more based on the weight % of the oxide. Therefore, the content of the cerium oxide used as a raw material is preferably 2 〇 ppm or less in terms of Fe ion. More preferably, the Fe content is 10 ppm or less, and particularly preferably the Fe content is 2 ppm or less. As the optical characteristics of the present glass, it is preferred that the refractive index (nd) is 2 Å to ® . More preferably, the refractive index (nd) of the present glass is 2 〇 5 or more, and more preferably, the refractive index (nd) of the present glass is 2.07 or more. Even more preferably, the refractive index (nd) of the present glass is 2.10 or more. Further, it is preferred that the Abbe number (Vd) of the glass is 2 Å or less, and more preferably, the Abbe number (Vd) of the glass is 18.5 or less, and particularly preferably the Abbe number (vd) of the glass. It is 18 or less. On the other hand, since it is difficult to set the Abbe number (vd) of the present glass to less than 15 ', it is preferably 15 or more. _ In optical glass, especially in the case of high refractive index, when the wavelength of light changes from near 600 nm to the short wavelength (ultraviolet region) side, the transmittance has a tendency to decrease sharply as the wavelength of light becomes shorter. . In the present specification, the tendency of light transmittance is evaluated based on the wavelength value of light having an internal transmittance of 5% and 50%. The wavelengths of the light having an internal transmittance of 5% and 50% are respectively changed toward the short wavelength side, and the light transmittance is better. Regarding the light transmission characteristics of the present glass, when the wavelength λ5 showing an internal transmittance of 5% (in terms of 10 mm thickness) is 430 nm or less, the transmittance on the short-wavelength side in the visible light range is improved, and the color reproducibility is obtained. Improvement, 138856.doc 200948735 Therefore, it is better that the glass is less than 42 〇 nm, particularly preferably λ of the glass; below 415 nm. Similarly, regarding the light transmission property of the glass, it is preferable that the internal transmittance is 5〇% (in terms of thickness of 1〇mm), the wavelength λα is 450 nm or less, and more preferably, the person of the glass is 445. Under nm#, it is particularly good that the λ5() of the glass is below 440 nm. Further, in the present specification, λ5 and λ5() measure spectral transmittance characteristics including surface loss for a pattern of thickness *tl (mm) and t2 (mm) (where t2 > ti), respectively, according to The difference was obtained by calculating the internal transmittance characteristic ' of the thickness and converting it to a thickness of 1 mm. Examples of the combination of t and t2 include t1 = l mm and t2 = l〇 mm as an example. When the glass transition point (Tg) of the present glass is 500 eC or less, the molding temperature can be lowered to improve the durability of the protective film formed on the surface of the mold, and thus it is preferable that the glass transition point of the glass is better. Tg) is 46 〇 <) (: The following. Particularly preferred is the glass transition point of the glass. As the thermal expansion coefficient of the glass, the average linear thermal expansion coefficient at 100 to 3 〇〇 ° C (X is 90~) When 110(χ10·ν>〇, the dimensional accuracy during molding is good, and molding failure is less likely to occur, and it is more preferable that the α of the glass is 95 to 105 (x10_7/°C). The method is not particularly limited. For example, an oxide, a hydroxide, a carbonate, a nitrate, a phosphate, or the like, which is usually used in an optical glass, can be weighed and placed in a platinum crucible, a rhodium, a quartz crucible. Alumina ruthenium, etc. are usually used in the crucible of optical glass, after melting, clarifying and stirring for about 1-2 hours in TC, casting 138856.doc •12·200948735 to preheating to 300 After ~450t mold, etc., slow down Further, the present invention is not particularly limited as a method of forming the glass into an optical element, but the glass transition point (Tg) i value of the glass can effectively exhibit the material if it is press-molded. Further, in addition to press molding, the present glass can be expanded to a use other than a lens such as a diffractive optical element or a dispersion compensating element by microfabrication. [Embodiment] Hereinafter, the present invention will be described. Examples and the like. Examples 1 to 2 are comparative examples of the present invention. Examples 3 to 2 are examples of the present invention. Further, Example 1 is a patent document 3 (Japanese Patent Laid-Open Publication No. 2002-201039) Example 4 of the Example disclosed in the example 2 is an example 30 of the example of Patent Document 4 (Japanese Patent Laid-Open No. 2006-327926). [Chemical Composition and Sample Preparation Method] To reach Tables 1 to 7 The raw material is weighed in the manner of the chemical composition (%) shown. For the case of the raw material of each glass 'p2〇5, H3p〇4 or BP04 is used, and in the case of B2〇3, h3b〇3 or BP04, Li20 is used. In the case of use

Li2C03 ’ SrO 之情形時係使用 src〇3，Si02、Al2〇3、 Bi2〇3、Ti〇2、Te02、ZnO、Ge02、Ga203 與 Nb205 之情形時係使用氧化物。將所稱量之原料加以混合，放入至内容積大約300 cc之金坩堝内，於大約8〇〇〜1〇〇〇〇c下熔融、澄清、攪拌1〜3個小時後，澆鑷至預熱至大約300〜450°C之縱 50 mmx橫50 mm之矩形鑄模後，以大約〇 5。〇 /分鐘之速度加以緩冷而製成試樣。 [評價方法] 138856.doc -13- 200948735 •折射率nd係相對於氦d線之折射率，係利用折射率呀 (Kalnew光學工業公司製造；商品名：KRp_2)來測定。折射率之值係測定至小數點以下第5位為止，並將小數點以下第5位加以四捨五入而作為小數點以下第4位加以記載。 •阿貝數vd#根據vd=(nd-1 )/(nF_nc)而計算至小數點以下第$ 位為止，並將小數點以下第2位加以四捨五人而作為小數點以下第1位加以記載。其中，分別係相對於❹線及C線之折射率。 •關於内部透射率Μ、^〇,如上所述，係測定厚度不同之兩塊板各自之分光透射率（包含表面反射損失），求出差量，以10 mm厚度進行換算。 •關於玻璃轉移溫度Tg，係將所獲得之各玻璃加工成棒狀’利用熱分析裝置（Bruker AXS公司製造；商品名： TMA4000SA)，藉由熱膨脹法，以升溫速度5。〇/分鐘來測定。 •關於玻璃之溶解性等，係製作上述試樣時藉由目視而觀察之結果’就例1〜例26而言，已確認溶解性不存在問題，所獲得之玻璃中無泡洙或脈紋。 [表1]In the case of Li2C03 'SrO, an oxide is used in the case of using src〇3, SiO2, Al2〇3, Bi2〇3, Ti〇2, Te02, ZnO, Ge02, Ga203 and Nb205. The weighed raw materials are mixed, placed in a metal crucible of about 300 cc in inner volume, melted, clarified, stirred for about 1-3 hours at about 8 〇〇~1 〇〇〇〇c, and then poured to After preheating to a rectangular mold of about 50 mm to 450 ° C and a length of 50 mm x 50 mm, it is about 〇5. 〇 / min speed is slowly cooled to make a sample. [Evaluation method] 138856.doc -13- 200948735 • The refractive index nd is a refractive index with respect to the 氦d line, and is measured by a refractive index (manufactured by Kalnew Optics Co., Ltd.; trade name: KRp_2). The value of the refractive index is measured until the fifth decimal place or less, and the fifth decimal place is rounded off to the fourth decimal place. • Abbe number vd# is calculated from vd=(nd-1 )/(nF_nc) to the decimal place below the decimal point, and the second digit below the decimal point is rounded up to the first digit of the decimal point. Recorded. Among them, the refractive indices are relative to the ❹ line and the C line, respectively. • Regarding the internal transmittance Μ and 〇, as described above, the spectral transmittance (including the surface reflection loss) of each of the two plates having different thicknesses was measured, and the difference was obtained and converted to a thickness of 10 mm. • Regarding the glass transition temperature Tg, each of the obtained glasses was processed into a rod shape by a thermal analysis method (manufactured by Bruker AXS Co., Ltd.; trade name: TMA4000SA) at a temperature increase rate of 5 by a thermal expansion method. 〇/min to measure. • Regarding the solubility of glass, etc., the result of observation by visual observation when producing the above sample. [Examples 1 to 26 have confirmed that there is no problem in solubility, and there is no bubble or vein in the obtained glass. . [Table 1]

No. 例1 例2 - 例4 38 0 化學成分 Bi203 40.4 42.0 42.1 --— 1*2。3 1.2 28.0 "2Z6 -- 26 8 Si〇2 19.8 10.0 "O' 10 9 Τι〇2 Ϊ9.3 2.0 10.4 01 Te02 10.1 0.0 ~~9Ό -- 10.8 P205 0.0 0.0 "6.8^~~~-- 2 7 A1203 1.9 0.0 ~〇1 -- 0 0 ZnO 0.0 6.0 9.0 -- 10.8 138856.doc 200948735 U20 0.0 10.0 0.0 0.0 SrO 0.0 2.0 0.0 0.0 Ga2〇3 5.5 0.0 0.0 0.0 Nb205 1.8 0.0 0.0 0.0 折射率nd 2.1100 2.1270 2.1827 2.0965 阿貝數vd 17.7 16.5 16.3 18.2 λ5/ηηι 488 435 424 411 λ5〇/ηιη 526 453 446 433 T/C 407 363 396 405 α(χ10·7) 105 111 105 104 [表2]No. Example 1 Example 2 - Example 4 38 0 Chemical composition Bi203 40.4 42.0 42.1 --- 1*2. 3 1.2 28.0 "2Z6 -- 26 8 Si〇2 19.8 10.0 "O' 10 9 Τι〇2 Ϊ9. 3 2.0 10.4 01 Te02 10.1 0.0 ~~9Ό -- 10.8 P205 0.0 0.0 "6.8^~~~-- 2 7 A1203 1.9 0.0 ~〇1 -- 0 0 ZnO 0.0 6.0 9.0 -- 10.8 138856.doc 200948735 U20 0.0 10.0 0.0 0.0 SrO 0.0 2.0 0.0 0.0 Ga2〇3 5.5 0.0 0.0 0.0 Nb205 1.8 0.0 0.0 0.0 Refractive index nd 2.1100 2.1270 2.1827 2.0965 Abbe number vd 17.7 16.5 16.3 18.2 λ5/ηηι 488 435 424 411 λ5〇/ηιη 526 453 446 433 T/C 407 363 396 405 α(χ10·7) 105 111 105 104 [Table 2]

No. 例5 例6 例7 例8 化學成分 Bi2〇3 45.6 38.0 39.9 38.4 B2〇3 22.3 19.1 25.0 24.0 Si02 0.0 23.7 15.0 0.0 T1O2 5.7 0.1 0.1 11.1 Te02 0.1 9.5 5.0 9.6 P2〇5 14.9 0.0 0.0 7.2 Al2〇3 0.0 0.0 0.0 0.0 ZnO 11.4 9.5 10.0 9.6 Li2〇 0.0 0.0 5.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 0.0 折射率nd 2.1073 2.1049 2.1149 2.1486 阿貝數vd 18.3 17.7 17.3 17.0 λ5/ηπι 413 417 423 420 λ5〇/ηιη 436 438 446 442 τ/c 436 405 382 428 α(χ10·7) 102 99 104 104 參 [表3]No. Example 5 Example 6 Case 7 Example 8 Chemical composition Bi2〇3 45.6 38.0 39.9 38.4 B2〇3 22.3 19.1 25.0 24.0 Si02 0.0 23.7 15.0 0.0 T1O2 5.7 0.1 0.1 11.1 Te02 0.1 9.5 5.0 9.6 P2〇5 14.9 0.0 0.0 7.2 Al2〇 3 0.0 0.0 0.0 0.0 ZnO 11.4 9.5 10.0 9.6 Li2〇0.0 0.0 5.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 0.0 Refractive index nd 2.1073 2.1049 2.1149 2.1486 Abbe number vd 18.3 17.7 17.3 17.0 Λ5/ηπι 413 417 423 420 λ5〇/ηιη 436 438 446 442 τ/c 436 405 382 428 α(χ10·7) 102 99 104 104 Reference [Table 3]

No.化學成分/% 例9 例10 例11 Bi2〇3 40.0 42.5 44.0 B2〇3 25.0 26.6 25.9 Si02 15.0 0.0 0.0 Ti02 0.1 12.3 12.0 Te02 15.0 10.6 10.4 P2O5 0.0 8.0 7.8 Al2〇3 0.0 Ό.Ο 0.1 ZnO 5.1 0.0 0.0 U2〇 0.0 0.0 0.0 SrO 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 138856.doc -15- 200948735 折射率η<ι 2.1307 2.1649 2.1774 阿貝數vd 17.2 16.8 16.5 λ5/ηπι 420 424 423 λ5〇/ηιη 445 450 447 τ/c 394 429 424 α(χ10'7) 105 104 105 [表4]No. Chemical composition/% Example 9 Example 10 Example 11 Bi2〇3 40.0 42.5 44.0 B2〇3 25.0 26.6 25.9 Si02 15.0 0.0 0.0 Ti02 0.1 12.3 12.0 Te02 15.0 10.6 10.4 P2O5 0.0 8.0 7.8 Al2〇3 0.0 Ό.Ο 0.1 ZnO 5.1 0.0 0.0 U2〇0.0 0.0 0.0 SrO 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 138856.doc -15- 200948735 Refractive index η<ι 2.1307 2.1649 2.1774 Abbe number vd 17.2 16.8 16.5 λ5/ηπι 420 424 423 λ5〇/ηιη 445 450 447 τ/c 394 429 424 α(χ10'7) 105 104 105 [Table 4]

No. 例12 例13 例14 例15 化學成分 Bi2〇3 37.0 35.0 35.0 37.0 B2〇3 22.5 25.0 25.0 31.7 Si〇2 15.0 10.0 10.0 0.0 Ti〇2 3.0 5.5 3.0 3.1 Te02 15.0 15.0 17.5 18.2 P2O5 2.5 4.5 4.5 4.8 AI2O3 0.0 0.0 0.0 0.0 ZnO 5.0 5.0 5.0 5.2 Li20 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb205 0.0 0.0 0.0 0.0 折射率n<i 2.1130 2.1019 2.1041 2.1069 阿貝數vd 17.7 18.0 18.2 18.1 λδ/ηπι 415 411 409 409 λ5〇/ηιη 440 438 437 435 TB/°C 439 424 424 407 a(xlO'〇 100 103 103 109 [表5]No. Example 12 Example 13 Example 14 Example 15 Chemical composition Bi2〇3 37.0 35.0 35.0 37.0 B2〇3 22.5 25.0 25.0 31.7 Si〇2 15.0 10.0 10.0 0.0 Ti〇2 3.0 5.5 3.0 3.1 Te02 15.0 15.0 17.5 18.2 P2O5 2.5 4.5 4.5 4.8 AI2O3 0.0 0.0 0.0 0.0 ZnO 5.0 5.0 5.0 5.2 Li20 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb205 0.0 0.0 0.0 0.0 Refractive index n<i 2.1130 2.1019 2.1041 2.1069 Abbe number vd 17.7 18.0 18.2 18.1 λδ /ηπι 415 411 409 409 λ5〇/ηιη 440 438 437 435 TB/°C 439 424 424 407 a(xlO'〇100 103 103 109 [Table 5]

No. 例16 例17 例18 例19 化學成分 Bi2〇3 35.2 33.6 33.6 32.4 B2〇3 25.0 30.9 30.9 30.6 Si02 4.9 0.0 0.0 0.0 Ti〇2 3.0 3.0 8.1 9.7 Te02 17.3 22.8 17.8 17.6 P2O5 4.5 4.6 4.6 4.6 ai2o3 0.0 0.0 0.0 0.0 ZnO 4.9 5.1 5.1 5.0 Li2〇 0.0 0.0 0.0 0.0 Ge〇2 5.1 0.0 0.0 0.0 Ga203 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 0.0 折鲁 -率Hd 2.1044 2.1021 2.1146 2.1164 阿貝數vd 18.0 18.2 17.8 17.6 λ5/ηιη 406 408 413 417 Wnm 424 435 438 443 138856.doc -16- 200948735No. Example 16 Example 17 Example 18 Example 19 Chemical composition Bi2〇3 35.2 33.6 33.6 32.4 B2〇3 25.0 30.9 30.9 30.6 Si02 4.9 0.0 0.0 0.0 Ti〇2 3.0 3.0 8.1 9.7 Te02 17.3 22.8 17.8 17.6 P2O5 4.5 4.6 4.6 4.6 ai2o3 0.0 0.0 0.0 0.0 ZnO 4.9 5.1 5.1 5.0 Li2〇0.0 0.0 0.0 0.0 Ge〇2 5.1 0.0 0.0 0.0 Ga203 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 0.0 Reduced-rate Hd 2.1044 2.1021 2.1146 2.1164 Abbe number vd 18.0 18.2 17.8 17.6 Λ5/ηιη 406 408 413 417 Wnm 424 435 438 443 138856.doc -16- 200948735

No. 例20 例21 例22 化 Bl2〇3 29.5 27.4 25.4 學 Β2Ο3 29.9 29.4 29.0 成 Si02 0.0 0.0 0.0 分 Ti02 7.9 7.7 7.6 Te02 23.3 26.1 28.9 P2〇5 4.5 4.8 4.4 Al2〇3 0.0 0.0 0.0 ZnO 4.9 4.8 4.8 U2〇 0.0 0.0 0.0 SrO 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 Nb205 0.0 0.0 0.0 折射率η<ι 2.0998 2.0902 2.0802 阿貝數Vd 18.1 18.5 18.5 λ^/ηιη 413 413 412 λ5〇/ηιη 437 438 433 T/C 429 433 432 α(χ10*7) 106 106 106 Γ矣71 / J No. 例23 例24 例25 例26 化 Bl2〇3 31.3 35.9 37.0 37.7 學 B2O3 30.3 31.4 31.7 32.2 成 Si02 0.0 0.0 0.0 0.0 分 Ti02 11.3 8.3 8.3 4.9 Te02 17.5 18.1 18.2 18.5 P2O5 4.6 4.7 4.8 4.9 AI2O3 0.0 0.0 0.0 0.0 ZnO 5.0 1.7 0.0 0.0 U2〇 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 1.8 折射率n<j 2.1164 2.1320 2.1378 2.1327 阿貝數Vd 17.7 17.4 17.3 17.6 λδ/ηιη 416 416 416 410 λ5〇/ηιη 441 442 443 440 τ/c 439 425 425 425 α(χ10'7) 103 106 107 109 T/c 431 409 422 433 α(χ10·7) 112 109 105 104 [表6] -17- 138856.doc 200948735 參照特定之實施形態對本發明進行了詳細說明，但業者顯然知道，於未偏離本發明之精神及範圍之情況下可加以各種變更或修改。本申請案係基於2008年2月28曰申請之曰本專利申請案 2008-047994者，且將該申請案之内容作為參照而編入於此。 [產業上之可利用性] 本玻璃係高折射率且高分散性之光學玻璃，由於透光特性優良，玻璃轉移點低，因此適宜壓製成形。並且本玻❹ 璃由於熱膨脹係數低，故而與先前者相比成形時產生次品之纽更少，尺寸精度亦更優良。因此，本玻璃適合用‘ 作具有高折射率、同分散性及高透光特性之精密壓製成形用光學玻璃。又’藉由本玻璃，可提供—種高性能之透鏡、繞射光學元件或分散補償元件等之光學元件。 138856.doc • 18-No. Example 20 Case 21 Case 22 B2〇3 29.5 27.4 25.4 Learning 2Ο3 29.9 29.4 29.0 Formation Si02 0.0 0.0 0.0 Minute Ti02 7.9 7.7 7.6 Te02 23.3 26.1 28.9 P2〇5 4.5 4.8 4.4 Al2〇3 0.0 0.0 0.0 ZnO 4.9 4.8 4.8 U2〇0.0 0.0 0.0 SrO 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 Nb205 0.0 0.0 0.0 Refractive index η<ι 2.0998 2.0902 2.0802 Abbe number Vd 18.1 18.5 18.5 λ^/ηιη 413 413 412 λ5〇/ηιη 437 438 433 T/ C 429 433 432 α(χ10*7) 106 106 106 Γ矣71 / J No. Example 23 Example 24 Example 25 Example 26 Chemistry Bl2〇3 31.3 35.9 37.0 37.7 Learning B2O3 30.3 31.4 31.7 32.2 Formation Si02 0.0 0.0 0.0 0.0 分 Ti02 11.3 8.3 8.3 4.9 Te02 17.5 18.1 18.2 18.5 P2O5 4.6 4.7 4.8 4.9 AI2O3 0.0 0.0 0.0 0.0 ZnO 5.0 1.7 0.0 0.0 U2〇0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 Ga2〇3 0.0 0.0 0.0 0.0 Nb2〇5 0.0 0.0 0.0 1.8 Refraction Rate n<j 2.1164 2.1320 2.1378 2.1327 Abbe number Vd 17.7 17.4 17.3 17.6 λδ/ηιη 416 416 416 410 λ5〇/ηιη 441 442 443 440 τ/c 439 425 425 425 α(χ10'7) 103 106 107 109 T/ c 431 409 422 433 α (χ10·7) 112 109 105 104 [Table 6] -17- 138856.doc 200948735 The present invention has been described in detail with reference to the specific embodiments thereof, but it is obvious to those skilled in the art without departing from the spirit and scope of the invention Various changes or modifications can be made. The present application is based on a patent application No. 2008-047994 filed on Jan. 28, 2008, the content of which is hereby incorporated by reference. [Industrial Applicability] The glass having a high refractive index and high dispersibility is excellent in light transmission characteristics and has a low glass transition point, so that it is suitable for press molding. Further, since the glass has a low coefficient of thermal expansion, it has fewer defects than the former, and the dimensional accuracy is also superior. Therefore, the present glass is suitable for use as an optical glass for precision press molding having high refractive index, uniform dispersibility, and high light transmission characteristics. Further, by the present glass, an optical element such as a high-performance lens, a diffractive optical element, or a dispersion compensating element can be provided. 138856.doc • 18-

Claims

200948735 VII. Patent application scope: 1 · Kind of optical glass 'based on oxide and based on m〇l%, it contains: Bl2〇3: 20~50%, B2〇3: 15~35%, Si02: 〇~3〇〇/0, 'Ti〇2 .〇·1 ～15%, Te〇2 : 0.1 〜3 0%, P205 : 0-15% » ❹ Al2〇3 : 〇~1〇0/〇, Zn〇: 〇~15% 〇2. The optical glass of claim 1, which does not substantially contain at least one of Ge〇2, (}32〇3 or Ce02. 3. Request item 1 or 2 The optical glass 'based on the oxide and based on m〇1〇/〇', the content of Mg〇+CaO+SrO+BaO is 〇~ι〇/0. 4. The optical glass of claim 1 is refracted. The rate is 厶(10) or more, and the Abbe number Vd is 15 to 20. © 5. The optical glass of claim 1 which exhibits an internal transmittance of 5% (in terms of 10 mm thickness) at a wavelength of 9.5 nm of 430 nm. The optical glass of claim 1 which exhibits an internal transmittance of 5〇% (in terms of 1 degree) and a wavelength of 50 is 450 nm or less. 7. The optical glass of claim 1 The glass transfer temperature % is 45 0. 13S856.doc 200948735 IV. Designated representative map: (1) The representative representative of the case is: (none) (2) The symbolic symbol of the representative figure is simple: 5. If there is a chemical formula in this case, please reveal the characteristics that can best display the invention. Chemical formula: (none) 138856.doc