JPH0617246B2 - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JPH0617246B2 JPH0617246B2 JP60225731A JP22573185A JPH0617246B2 JP H0617246 B2 JPH0617246 B2 JP H0617246B2 JP 60225731 A JP60225731 A JP 60225731A JP 22573185 A JP22573185 A JP 22573185A JP H0617246 B2 JPH0617246 B2 JP H0617246B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- temperature
- glass
- optical glass
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000005304 optical glass Substances 0.000 title claims description 13
- 230000036314 physical performance Effects 0.000 claims description 4
- 229910018068 Li 2 O Inorganic materials 0.000 claims 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 239000011521 glass Substances 0.000 description 19
- 238000000465 moulding Methods 0.000 description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 description 10
- 238000004031 devitrification Methods 0.000 description 8
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 7
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 5
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007572 expansion measurement Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- NOTVAPJNGZMVSD-UHFFFAOYSA-N potassium monoxide Inorganic materials [K]O[K] NOTVAPJNGZMVSD-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
- C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Description
【発明の詳細な説明】 本発明は屈伏温度（Ａｔ）が５７０℃以下、屈折率（ｎ
ｄ）が１．６９０〜１．７２５、比重が４．０以下の物
理的性能を持ち、比較的低温（６２０℃以下）での精密
プレスができ、球面及び非球面を持ち研磨工程を必要と
しない光学素子を作成することを目的とした光学ガラス
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention has a yield temperature (At) of 570 ° C. or lower and a refractive index (n
d) has a physical performance of 1.690 to 1.725 and a specific gravity of 4.0 or less, can perform precision pressing at a relatively low temperature (620 ° C or less), has a spherical surface and an aspherical surface, and requires a polishing step. The present invention relates to an optical glass for the purpose of producing an optical element that does not.
近年プレス成形後、研磨工程無しに直ちにレンズ、プリ
ズム等として使用するための精密プレス技術の研究・開
発がさかんにおこなわれている。その開発の中心は、成
形型の材質とその高い面精度の保持であり、種々の材質
の成形型が実験され報告されている。また、面精度を保
持するために、例えば酸化防止のために特開昭５２−４
５６１３号及び特公昭５４−３９８４６号各公報におい
ては窒素雰囲気、特公昭５４−３８１２６号公報では窒
素＋水素雰囲気、特開昭５９−１２０４２５号公報では
真空＋窒素等不活性ガス、特開昭５９−１１６１３６号
公報では高真空といったように、雰囲気の調整を行うな
どの工夫がなされている。当然のことながら成形型の酸
化防止及び面精度保持の観点から考えれば、出来るかぎ
り低い温度に成形型を保持することが望ましい。そのた
めには、精密プレス成形されるガラスは、低い温度でブ
レス成形されることが要求され、一方ガラスの成形温度
はそのガラスの線膨張測定における屈伏温度（Ａｔ）を
参考にして決められる。In recent years, research and development of precision press technology for use as lenses, prisms and the like immediately after press molding without a polishing step have been vigorously carried out. The center of its development is to maintain the material of the mold and its high surface accuracy, and molds of various materials have been tested and reported. Further, in order to maintain the surface accuracy, for example, to prevent oxidation, JP-A-52-4
5613 and Japanese Patent Publication No. 54-39846, a nitrogen atmosphere, Japanese Patent Publication No. 54-38126, a nitrogen + hydrogen atmosphere, and Japanese Patent Laid-Open No. 59-120425, a vacuum + inert gas such as nitrogen. In Japanese Patent Laid-Open No. 116136, there is a device such as adjusting the atmosphere such as high vacuum. As a matter of course, from the viewpoint of preventing oxidation of the molding die and maintaining surface accuracy, it is desirable to hold the molding die at a temperature as low as possible. For that purpose, the glass to be precision press-molded is required to be press-molded at a low temperature, while the molding temperature of the glass is determined with reference to the yield temperature (At) in the linear expansion measurement of the glass.
しかし、従来よりある光学ガラスでは、例えば鉛を多量
に含む光学ガラスにおいて、５７０℃以下の屈伏温度
（Ａｔ）を持ち高屈折率ではあるが比重が大きいか、プ
レス成形温度でのガラスの安定性が悪い。鉛を少量含む
か、又は鉛を含まない光学ガラスで高屈折率のものは、
そのほとんどが屈伏温度（Ａｔ）が６５０℃前後、もし
くはそれ以上のものしか存在していない。それらの実例
を示すと、第１表の通りである。However, among conventional optical glasses, for example, optical glass containing a large amount of lead has a yield temperature (At) of 570 ° C. or less and has a high refractive index but a large specific gravity, or the stability of the glass at the press molding temperature. Is bad. Optical glass containing a small amount of lead or containing no lead and having a high refractive index
Most of them have a deformation temperature (At) of around 650 ° C. or higher. The examples are shown in Table 1.
本発明は、上記のことを考慮し、レーザ光学用素子（例
えばコンパクトデイスク用等）として設計上必要とされ
る。上記物理的性能を持つ光学ガラスの開発に本発明者
等が鋭意研究した結果、SiO2-B2O3-Li2O基礎系に、TiO
2、Nb2O5、ＰｂＯを二種以上含有させ、さらに他の成分
を必要に応じて添加することにより、プレス成形温度で
安定である所記の目的を達成することを見いだしたもの
である。 In consideration of the above, the present invention is required in design as a laser optical element (for example, for compact disk). As a result of the inventors' earnest research on the development of the optical glass having the above-mentioned physical performance, as a basic system of SiO2-B2O3-Li2O, TiO2
It has been found that by containing two or more kinds of 2, Nb2O5, and PbO, and further adding other components as necessary, the above-mentioned object of being stable at the press molding temperature can be achieved.
すなわち本発明は SiO2 ２３ 〜 ３４ 重量％ B2O3 ５ 〜 １１ 重量％ TiO2、Nb2O5、ＰｂＯの二種以上 ２５ 〜 ５０ 重量％ ただし TiO2 ０ 〜 ２０ 重量％ Nb2O5 ０ 〜 １４ 重量％ ＰｂＯ ０ 〜 ４５ 重量％ Li2O、Na2O、K2Oの二種以上 １０．５〜 １８ 重量％ ただし Li2O ０．５ 〜 ５ 重量％ Na2O ０ 〜 ９ 重量％ K2O ０ 〜 １１ 重量％ ＢａＯ ０ 〜 １２ 重量％ ＺｎＯ ０ 〜 ８ 重量％ GeO2 ０ 〜 ３ 重量％ ZrO2 ０ 〜 ３ 重量％ からなる組成を有する屈伏温度（Ａｔ）が５７０℃以下
で、屈折率（ｎｄ）が１．６９０〜１．７２５であり、
４．０以下の比重の物理的性能を持つ、精密プレス温度
が６２０℃以下である精密プレス用光学ガラスである。That is, the present invention is SiO2 23 to 34 wt% B2O3 5 to 11 wt% TiO2, Nb2O5, PbO 2 or more 25 to 50 wt%, but TiO2 0 to 20 wt% Nb2O5 0 to 14 wt% PbO 0 to 45 wt% Li2 , Two or more kinds of Na2O and K2O 10.5 to 18% by weight, but Li2O 0.5 to 5% by weight Na2O 0 to 9% by weight K2O 0 to 11% by weight BaO 0 to 12% by weight ZnO 0 to 8% by weight GeO2 0 Having a composition of ˜3 wt% ZrO2 0 ˜3 wt%, a yield temperature (At) of 570 ° C. or lower, and a refractive index (nd) of 1.690 to 1.725,
It is an optical glass for precision press, which has a physical performance of 4.0 or less in specific gravity and a precision pressing temperature of 620 ° C. or less.
ここにおいて各配合成分を上記のように限定した理由は
次の通りである。The reason why each component is limited as described above is as follows.
本発明に関するＳｉＯ２はガラスの網目を構成する主成
分であるが、２３重量％より少ないと失透傾向が大きく
なり、３４重量％より多くなると、熔融時の粘性が大き
くなるばかりでなく、屈伏温度（Ａｔ）の上昇をまね
く。Although SiO2 related to the present invention is a main component constituting the glass network, if it is less than 23% by weight, the devitrification tendency becomes large, and if it exceeds 34% by weight, not only the viscosity at the time of melting becomes large, but also the yielding temperature increases. (At) rises.
B2O3は、SiO2と同様ガラスの網目を構成し、ガラスの安
定化に有効な成分である。またガラスの均質化に有効で
あり、さらに適量含有させることにより屈伏温度（Ａ
ｔ）を下げる。しかし、５重量％より少ないと上記の効
果が少なく、１１重量％より多くなると化学的耐久性が
悪くなる。B2O3 forms a glass network like SiO2 and is an effective component for stabilizing glass. It is also effective for homogenizing the glass, and the yielding temperature (A
Lower t). However, if it is less than 5% by weight, the above effect is small, and if it is more than 11% by weight, the chemical durability is deteriorated.
TiO2、Nb2O5及びＰｂＯは、それぞれ屈折率を高める効果
があり、二種以上をうまく組み合せることにより、所期
の目的を有するガラスが得られるが、TiO2、Nb2O5及びＰ
ｂＯの二種以上の合量が２５重量％より少なく５０重量
％より多いと、目的とする屈折率は得られない。また各
成分がそれぞれTiO2が２０重量％、Nb2O5が１４重量％
より多いと屈伏温度（Ａｔ）の上昇をまねき、ＰｂＯが
４５重量％より多くなると、プレス成形時において鉛の
揮発により、面精度の保持が困難となるばかりか、比重
を重くする。TiO2, Nb2O5 and PbO each have the effect of increasing the refractive index, and by properly combining two or more of them, glass having the intended purpose can be obtained.
If the total amount of two or more kinds of bO is less than 25% by weight and more than 50% by weight, the target refractive index cannot be obtained. In addition, each component contains 20% by weight of TiO2 and 14% by weight of Nb2O5.
If the amount is larger, the yield temperature (At) is increased, and if the amount of PbO is more than 45% by weight, volatilization of lead during press molding makes it difficult to maintain the surface accuracy and increases the specific gravity.
Li2Oは、本発明において重要な意味をもつ成分であり、
Li2Oを必須配合成分として適量加えることにより、ガラ
スの安定性を損なうことなく、著しくプレス成形時の温
度を下げる効果を持つ。Li2Oが０．５重量％より少ない
と上記効果が少なく、５重量％より多いと失透傾向の増
大をまねく。Li2O is a component having an important meaning in the present invention,
By adding an appropriate amount of Li2O as an essential component, it has the effect of significantly lowering the temperature during press molding without impairing the stability of the glass. If the amount of Li2O is less than 0.5% by weight, the above effect is small, and if it is more than 5% by weight, the devitrification tendency is increased.
Na2O、K2Oもそれぞれプレス成形時の温度降下に寄与する
が、Na2Oが９重量％、K2Oが１０重量％より多いと失透
傾向が増大するばかりでなく、化学的耐久性も悪くな
る。Na2O and K2O also contribute to the temperature drop during press molding, but when Na2O is more than 9% by weight and K2O is more than 10% by weight, not only the devitrification tendency increases but also the chemical durability deteriorates.
Li2O、Na2O及びK2Oの二種以上の含量が１０．５重量％よ
り少ないと、プレス成形時の温度上昇となり、１８重量
％より多いと、化学的耐久性が悪くなるとともに失透傾
向も大となる。If the content of two or more kinds of Li2O, Na2O and K2O is less than 10.5% by weight, the temperature rises during press molding, and if it is more than 18% by weight, the chemical durability is deteriorated and the devitrification tendency is large. Become.
ＢａＯ、ＺｎＯはそれぞれ任意配合成分であり、ＢａＯ
はガラスの安定化に寄与するが、１２重量％より多くな
ると失透傾向が増大する。ＺｎＯは化学的耐久性を良く
し、プレス成形温度を下げるのに良好であるが、８重量
％を越えると失透傾向が大となる。BaO and ZnO are optional compounding ingredients.
Contributes to the stabilization of the glass, but if it exceeds 12% by weight, the devitrification tendency increases. ZnO improves chemical durability and is good for lowering the press molding temperature, but if it exceeds 8% by weight, the devitrification tendency becomes large.
GeO2は任意成分であり、ガラスの安定化に寄与するがそ
の効果は、３重量％までで充分である。GeO2 is an optional component and contributes to the stabilization of the glass, but its effect is sufficient up to 3% by weight.
ZrO2は任意成分であり、屈折率を高めガラスの化学的耐
久性を高めるが、３重量％より多くなるとガラスの失透
傾向が増大し、さらにプレス成形温度の上昇をもたら
す。ZrO2 is an optional component, which increases the refractive index and enhances the chemical durability of the glass, but if it exceeds 3% by weight, the devitrification tendency of the glass increases, and further the press molding temperature rises.
なお、製造の都合上、ＭｇＯ、ＣａＯ等アルカリ土類、
La2O3、Gd2O3等稀土類、Al2O3、Ta2O5等一般の光学ガラス
に用いられる成分の数重量％を含むことによっても本発
明は実施される。For convenience of production, alkaline earth such as MgO and CaO,
The present invention is also practiced by including rare earths such as La2O3, Gd2O3, Al2O3, Ta2O5, and the like, which are included in the optical glass in an amount of several% by weight.
本発明による実施例を後記の第２表に示す。Examples of the present invention are shown in Table 2 below.
本発明の光学ガラスは第２表の比率でガラス原料を混合
した後、バッチを白金製ルツボに投入して電気炉で１０
００〜１２００℃で熔融し、白金製攪拌棒にて攪拌し
て、清澄し均質化してから適当な温度に予熱した金型内
に鋳込んだ後、徐冷して作る。このように本発明の、ガ
ラスは屈伏温度（Ａｔ）において５７０℃以下で、１．
６９０〜１．７２５の高い屈折率、４．０以下の比重を
有し、失透に対して安定で、工業的規模において良好に
製造できるものである。第２表からわかるように、本発
明の光学ガラスは、ＰｂＯを含まない実施例１、３及び
４においても屈伏温度は５６０℃以下であり、ＰｂＯを
配合した実施例２、５、６及び７では屈伏温度は４８０
℃以下と極めて低くなっている。本発明の光学ガラスの
場合、屈伏温度より３０〜５０℃高い温度での精密プレ
ス成形が可能なので、全体として６２０℃以下という低
い温度での精密プレス成形が可能なのである。なお、精
密プレス成形温度は、プレスする圧力によっても若干異
なるが、第２表の実施例１〜７のガラスの場合は、それ
ぞれ５９０、５１０、５８０、５９０、４９０、４５０
及び４６０℃程度の温度で精密プレス成形をすることが
できる。また本発明のガラスの一般の光学ガラスとして
使用してなんら差し支えない。なおガラスの着色を防
ぎ、脱泡のために少量のAs2O3を加えること、又は工業
上良く知られている脱泡成分の少量添加は、本発明の効
果に影響を与えない。In the optical glass of the present invention, the glass raw materials were mixed in the ratios shown in Table 2, and then the batch was put into a platinum crucible and heated in an electric furnace.
It is melted at 00 to 1200 ° C., stirred with a stirring rod made of platinum, clarified and homogenized, cast in a mold preheated to an appropriate temperature, and then gradually cooled. As described above, the glass of the present invention has a yield temperature (At) of 570 ° C. or lower and 1.
It has a high refractive index of 690 to 1.725, a specific gravity of 4.0 or less, is stable against devitrification, and can be favorably manufactured on an industrial scale. As can be seen from Table 2, the optical glass of the present invention has a deformation temperature of 560 ° C. or lower even in Examples 1, 3 and 4 containing no PbO, and Examples 2, 5, 6 and 7 containing PbO. So the yield temperature is 480
It is extremely low, below ℃. In the case of the optical glass of the present invention, precision press molding can be performed at a temperature 30 to 50 ° C. higher than the yielding temperature, so that precision press molding can be performed at a temperature as low as 620 ° C. or less as a whole. The precision press molding temperature is slightly different depending on the pressing pressure, but in the case of the glasses of Examples 1 to 7 in Table 2, it is 590, 510, 580, 590, 490 and 450, respectively.
Precision press molding can be performed at a temperature of about 460 ° C. Further, the glass of the present invention can be used as a general optical glass without any problem. It should be noted that addition of a small amount of As2O3 for preventing decoloration of glass and defoaming, or addition of a small amount of defoaming component well known in industry does not affect the effect of the present invention.
Claims (1)
率（ｎｄ）が１．６９０〜１．７２５であり、４．０以
下の比重の物理的性能を持つ、精密プレス温度が６２０
℃以下である精密プレス用光学ガラス。1. A SiO 2 23-34 wt% B 2 O 3 5 to 11 wt% TiO 2, Nb 2 O 5 , 25~50 wt% of two or more of PbO, however TiO 2 0 to 20 wt% Nb 2 O 5 0-14 wt% PbO 0 to 45 wt% Li 2 O, Na 2 O , 10.5 ~18 wt% of two or more of K 2 O provided that Li 2 O 0.5 to 5 wt% Na 2 O 0 to 9% by weight K 2 O 0 to 11% by weight BaO 0 to 12% by weight ZnO 0 to 8% by weight GeO 20 to 3% by weight ZrO 20 0 to 3% by weight and a yield temperature (At) of 570 ° C. or lower. , The refractive index (nd) is 1.690 to 1.725, the physical performance is 4.0 or less, and the precision press temperature is 620.
Optical glass for precision press that is below ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60225731A JPH0617246B2 (en) | 1985-10-09 | 1985-10-09 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60225731A JPH0617246B2 (en) | 1985-10-09 | 1985-10-09 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6287432A JPS6287432A (en) | 1987-04-21 |
| JPH0617246B2 true JPH0617246B2 (en) | 1994-03-09 |
Family
ID=16833939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60225731A Expired - Lifetime JPH0617246B2 (en) | 1985-10-09 | 1985-10-09 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617246B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2668049B2 (en) * | 1988-02-26 | 1997-10-27 | 株式会社オハラ | Optical glass |
| JP2795326B2 (en) * | 1991-04-05 | 1998-09-10 | 株式会社オハラ | Optical glass |
| JP3383942B2 (en) * | 1999-08-02 | 2003-03-10 | Ｈｏｙａ株式会社 | Glass substrate for WDM optical filter, WDM optical filter, optical multiplexer / demultiplexer for WDM |
| JP4034589B2 (en) * | 2001-06-06 | 2008-01-16 | 株式会社オハラ | Optical glass |
| TWI250135B (en) | 2001-10-15 | 2006-03-01 | Hoya Corp | Optical glass, glass material for press molding, optical element, and method of manufacturing same |
| JP4496763B2 (en) * | 2003-11-06 | 2010-07-07 | 日本電気硝子株式会社 | Optical glass for mold press molding |
| CN102674685B (en) * | 2012-04-23 | 2014-08-27 | 湖北新华光信息材料有限公司 | Optical glass |
| EP3747840B1 (en) * | 2018-01-31 | 2024-03-20 | Agc Inc. | Optical glass and optical component |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6096542A (en) * | 1983-10-27 | 1985-05-30 | Hoya Corp | Glass for multi-focus eyeglass lens |
-
1985
- 1985-10-09 JP JP60225731A patent/JPH0617246B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6287432A (en) | 1987-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2668049B2 (en) | Optical glass | |
| EP1125898B1 (en) | Optical glass for mold pressing and optical element | |
| JP3015078B2 (en) | Optical glass for precision press | |
| JP2565813B2 (en) | Optical glass | |
| JPH05270853A (en) | Highly dispersive optical glass | |
| JPWO2001072650A1 (en) | Optical glass and optical elements | |
| JPWO2003037813A1 (en) | Optical glass for molding | |
| JP2726310B2 (en) | Optical glass for precision press molding | |
| JPS63265840A (en) | Optical glass | |
| JPH07149536A (en) | Optical glass | |
| JP2616980B2 (en) | Optical glass for precision press molding | |
| JP3100726B2 (en) | Optical glass for precision press molding | |
| JPS61163138A (en) | Optical glass with high refractive index and low dispersion | |
| JPH0558669A (en) | Optical glass | |
| JP3987174B2 (en) | Optical glass for precision press molding | |
| JPH0617246B2 (en) | Optical glass | |
| JP2006151758A (en) | Optical glass for precision press molding | |
| JPH06144868A (en) | Optical glass | |
| JPH0686308B2 (en) | Optical glass | |
| JP3015079B2 (en) | Optical glass for precision press | |
| JP2002211949A (en) | Optical glass for press molding, preform material for press molding and optical element using the same | |
| JP2616958B2 (en) | Optical glass for precision press molding | |
| JP3034427B2 (en) | Low temperature softening optical glass for mold press | |
| JPH01148726A (en) | Optical glass | |
| JPH07247136A (en) | Optical glass having low melting point and optical goods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |