JP4219012B2 - Optical glass - Google Patents
Optical glass Download PDFInfo
- Publication number
- JP4219012B2 JP4219012B2 JP23250998A JP23250998A JP4219012B2 JP 4219012 B2 JP4219012 B2 JP 4219012B2 JP 23250998 A JP23250998 A JP 23250998A JP 23250998 A JP23250998 A JP 23250998A JP 4219012 B2 JP4219012 B2 JP 4219012B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- component
- amount
- sio
- present
- 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 14
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 14
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000011521 glass Substances 0.000 description 42
- 238000004031 devitrification Methods 0.000 description 18
- 239000000126 substance Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 206010040925 Skin striae Diseases 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Images
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
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
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
【０００１】
【発明の属する技術分野】
本発明は、屈折率（ｎｄ）が１．６０〜１．６８、アッベ数（νｄ）が５５以上の光学恒数を有する光学ガラスに関する。
【０００２】
【従来の技術】
従来、前記範囲の光学恒数を有する光学ガラスとして、例えば、ＳｉＯ2、Ｂ2Ｏ3 およびＢａＯを基本的成分とするガラスが知られている。この組成系のガラスは、溶融時の安定性に優れているものの化学的耐久性が非常に劣っており、ガラスの研磨および洗浄工程や、レンズとしての長期間にわたる使用過程において、ガラス表面にヤケや風化作用による侵蝕が生じやすく、上記従来のガラスの加工および使用に際しては特別な注意を要した。また、上記従来のガラスは、ＢａＯ成分を比較的多量に含有しているため比重が大きくなる傾向があり、さらに、調合原料を溶融する際にＳｉＯ2 成分が融液表面に分離しやすく、均質なガラスが得にくいという問題点がある。
【０００３】
【発明が解決しようとする課題】
本発明の目的は、上記従来技術に見られる諸欠点を解消し、前記所定の範囲の光学恒数および良好な化学的耐久性を有し、かつ、耐失透性および溶融性に優れ、Ｇｄ2Ｏ3およびＴａ2Ｏ5のような原料価格の高い成分を含有しない、もしくは、必須成分としない安定な光学ガラスを提供することにある。
【０００４】
【課題を解決するための手段】
本発明者は、前記課題を解決するために鋭意試験研究を重ねた結果、特定組成範囲のＳｉＯ2−Ｂ2Ｏ3―ＣａＯ−Ｌａ2Ｏ3系ガラスにＬｉ2ＯおよびＹ2Ｏ3を必須成分として添加することによって、前記目的を達成し得ることを見いだし本発明をなすに至った。
【０００６】
すなわち、前記目的を達成するための本発明の光学ガラスの特徴は、請求項１に記載のとおり、重量％で、ＳｉＯ2 ６〜１５％、Ｂ2Ｏ3 ４０〜５０％、Ａｌ2Ｏ3 ０．３〜５％、Ｌａ2Ｏ3 １０〜２５％、Ｙ2Ｏ3 １〜１２％、ただし、Ｌａ2Ｏ3＋Ｙ2Ｏ3 １５〜３０％、ＣａＯ １８〜２５％、Ｌｉ2Ｏ ０％を超え０．５％未満まで、ＭｇＯ ０〜５％、ＳｒＯ ０〜５％、ＢａＯ ０〜１０％、ＺｎＯ ０〜１０％ＺｒＯ2 ０〜５％、Ｔａ2Ｏ5 ０〜５％およびＳｂ2Ｏ3 ０〜０．５％の組成からなり、ＴｉＯ2 、Ｎｂ2Ｏ5およびＷＯ3を含有しないところにある。
【０００７】
また、請求項２に記載のとおり、重量％で、ＳｉＯ2 ６〜１５％、Ｂ2Ｏ3 ４０〜５０％、ただし、ＳｉＯ2＋Ｂ2Ｏ3 ５０％以上、Ａｌ2Ｏ3 ０．３〜５％、Ｌａ2Ｏ3 １０〜２５％、Ｙ2Ｏ3 １〜１２％、ただし、Ｌａ2Ｏ3＋Ｙ2Ｏ3 １５〜３０％、ＣａＯ １８〜２５％、Ｌｉ2Ｏ ０％を超え０．５％未満まで、ＭｇＯ ０〜５％、ＳｒＯ ０〜５％、ＢａＯ ０〜１０％、ＺｎＯ ０〜１０％ＺｒＯ2 ０〜５％、Ｔａ2Ｏ5 ０〜５％およびＳｂ2Ｏ3 ０〜０．５％の組成からなり、ＴｉＯ2 、Ｎｂ2Ｏ5およびＷＯ3を含有しないところにある。
【０００８】
【発明の実施の形態】
本発明の光学ガラスにおいて、各成分を前記組成範囲に限定した理由を以下に述べる。
ＳｉＯ2およびＢ2Ｏ3 成分は、ガラス形成酸化物であり、本発明において、ガラス化範囲を広くし、かつ、ガラスに適度な粘度を持たせるのに有効である。ＳｉＯ2 成分は、その量が５％以下では上記効果が不十分であり、２０％を超えると混合原料の溶融性が悪くなり、未溶融物を生じやすくなる。また、Ｂ2Ｏ3成分は、その量が３５％未満の場合および５５％を超える場合、所望の屈折率のガラスを得にくくなる。特に均質性の良いガラスを得るためには、ＳｉＯ2 成分の量を６〜１５％、Ｂ2Ｏ3成分の量を４０〜５０％とすることが好ましい。さらに、一段と安定なガラスを得るためには、ＳｉＯ2成分およびＢ2Ｏ3 成分の合計量を５０％以上とすることがより好ましい。
【０００９】
Ａｌ2Ｏ3成分は、ガラスの化学的耐久性の向上や粘度の調整、および失透に対する安定化に効果がある。しかし、その量が１０％以上になると、かえって失透性が増大し好ましくない。より好ましい量は０．３〜５％である。
【００１０】
Ｌａ2Ｏ3成分は、ガラスの化学的耐久性および耐失透性を向上させるとともに、分散をあまり大きくすることなしに屈折率を高め、高屈折率を有する安定なガラスを得るのに有効な成分である。その量が１０％未満であるとガラスの化学的耐久性や耐失透性が不十分であり、また３０％を超えると所望の屈折率が得られなくなる。所望の光学恒数を有し、かつ、失透のない均質なガラスを得るには、Ｌａ2Ｏ3成分の量が１０〜２５％の範囲であることがより好ましい。
【００１１】
Ｙ2Ｏ3成分は、Ｌａ2Ｏ3成分と同様にガラスの化学的耐久性および耐失透性を向上させ、分散をあまり大きくすることなしに屈折率を高め、さらに、比重を小さくするのに有効な成分である。その量が０．５％未満では上記効果が十分ではなく、また、１５％を超えると、かえって、結晶の析出する温度が上昇し、ガラスが失透しやすくなる。Ｙ2Ｏ3成分の量のより好ましい範囲は１〜１２％である。
さらに、本発明において、一段と安定なガラスを得るためには、Ｌａ2Ｏ3成分およびＹ2Ｏ3成分の合計量を１５〜３０％とすることが好ましい。
【００１２】
ＣａＯ成分は、ガラスの化学的耐久性、耐失透性およびガラス原料の溶融性を向上するのに効果がある。ＣａＯ成分の量が１０％未満では上記効果が十分でなく、また、所望の光学恒数を得がたい。また、その量が３０％を超えるとかえって失透化傾向が増大し好ましくない。ＣａＯ成分のより好ましい量は１８〜２５％である。
【００１３】
Ｌｉ2 Ｏ成分は、本発明において、ガラス原料の溶融を促進するのに有効な必須成分であるが、上記効果を得るためには、その量は０．５％未満で十分である。また、Ｌｉ2 Ｏ成分の一部をＮａ2ＯおよびＫ2Ｏ成分の一方または両方で置き換えることが可能である。
【００１４】
ＭｇＯ、ＳｒＯ、ＢａＯおよびＺｎＯの各成分は、ガラスの屈折率やアッベ数の調整、ガラス原料の溶融性の向上および耐失透性の改善のために有効であり、ＭｇＯおよびＳｒＯ成分をそれぞれ５％まで、また、ＢａＯおよびＺｎＯ成分をそれぞれ１５％まで加えることができる。なお、ＢａＯおよびＺｎＯ成分の量は、それぞれ１０％までとすることが、より好ましい。
【００１５】
本発明のガラスには、屈折率やアッベ数の調整またはガラスの安定性向上のために、ＴｉＯ2、ＺｒＯ2 、Ｎｂ2Ｏ5、Ｔａ2Ｏ5およびＷＯ3の各成分を任意に添加し得るが、それらの量は、ＴｉＯ2成分は３％まで、ＺｒＯ2、Ｎｂ2Ｏ5、Ｔａ2Ｏ5およびＷＯ3の各成分は、それぞれ５％までで十分である。しかし、ＴｉＯ2、Ｎｂ2Ｏ5およびＷＯ3 成分は、短波長側におけるガラスの光線透過率を低くする傾向があるので、これらの成分を含有しないほうがより好ましい。
【００１６】
Ｓｂ2Ｏ3成分は、ガラス溶融の際の清澄剤として任意に添加し得るが、その量は１％以下で十分であり、より適当な量は０．５％以下である。
また、本発明のガラスには、上記成分の他に、上述の各金属酸化物成分に含まれる金属元素の弗化物やＰ2Ｏ5等の成分を外割で５％まで添加しても差し支えない。
【００１７】
【実施例】
次に、本発明にかかる光学ガラスの実施例（Ｎｏ．１〜Ｎｏ．４）および従来のガラスの比較例（Ｎｏ．Ａ）をこれらのガラスの屈折率（ｎｄ）、アッベ数（νｄ）、失透温度（℃）、比重およびＬａ2Ｏ3に対するＹ2Ｏ3の重量比とともに表１に示し、上記実施例（Ｎｏ．１〜Ｎｏ．４）および比較例（Ｎｏ．Ａ）のガラスのＹ2Ｏ3成分の含有量と失透温度（℃）との関係を図１に示す。上記失透温度は、得られた各ガラスの破砕片を白金板に設けた小穴上に置き、温度傾斜炉内で融解し３０分間保持した後、炉外へ取り出し、結晶の発生状況を顕微鏡で観察して求めた結果を示したものである。また、本発明にかかる光学ガラスの他の実施例（Ｎｏ．５〜Ｎｏ．２３）をこれらのガラスの屈折率（ｎｄ）およびアッベ数（νｄ）とともに表２、表３、表４および表５に示す。
【００１８】
【表１】
【表２】
【表３】
【表４】
【表５】
表１および図１に見られるとおり、本発明の実施例のガラスは、比較例のガラスと比べ、失透温度が低く耐失透性が一段と優れており、比重も小さい。また、上記実施例のガラスは、いずれも、溶融性に優れ、泡や脈理のない均質なガラスが得られ、かつ、化学的耐久性も良好である。また、表２〜表６に示した本発明の実施例のガラスも、同様に、耐失透性、溶融性および化学的耐久性に優れており、比重が小さい。
本発明にかかる上記表１〜表６の実施例のガラスは、酸化物、炭酸塩、水酸化物、硝酸塩および弗化物等の通常の光学ガラス原料を秤量混合し、白金ルツボ等を用いて、約１２００℃から１４００℃で約２から４時間、溶融、清澄、攪拌した後、予熱した金型等に鋳込み、徐冷することにより、容易に製造することができる。
【００２５】
【発明の効果】
以上述べたとおり、本発明の光学ガラスは、特定組成範囲のＳｉＯ2 −Ｂ2Ｏ3−ＣａＯ−Ｌａ2Ｏ3系ガラスにＬｉ2ＯおよびＹ2Ｏ3 を必須成分として添加したガラスであり、屈折率（ｎｄ）が１．６０〜１．６８、アッベ数（νｄ）が５５以上の範囲の光学恒数を有し、耐失透性および溶融性に優れ、良好な化学的耐久性を有する安定かつ均質な光学ガラスを得ることができる。さらに本発明の光学ガラスは、原料価格の高いＧｄ2Ｏ3成分を含有せず、Ｔａ2Ｏ5成分を必須成分としておらず、安価に製造し得るという点においても有用である。
【図面の簡単な説明】
【図１】Ｙ2Ｏ3成分の含有量と失透温度（℃）との関係を示す図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical glass having an optical constant having a refractive index (nd) of 1.60 to 1.68 and an Abbe number (νd) of 55 or more.
[0002]
[Prior art]
Conventionally, as an optical glass having an optical constant in the above range, for example, a glass containing SiO 2 , B 2 O 3 and BaO as basic components is known. Glass of this composition system is excellent in stability at the time of melting, but its chemical durability is very inferior, and the glass surface is burned in the polishing and cleaning process of the glass and in the use process for a long time as a lens. Erosion due to weathering is likely to occur, and special care was required when processing and using the conventional glass. In addition, the above-mentioned conventional glass tends to increase in specific gravity because it contains a relatively large amount of the BaO component. Further, when melting the preparation raw material, the SiO 2 component is easily separated on the melt surface and is homogeneous. There is a problem that it is difficult to obtain a simple glass.
[0003]
[Problems to be solved by the invention]
The object of the present invention is to eliminate the above-mentioned disadvantages found in the prior art, to have the above-mentioned predetermined range of optical constants and good chemical durability, and to be excellent in devitrification resistance and meltability. It is an object of the present invention to provide a stable optical glass that does not contain a high-priced component such as 2 O 3 and Ta 2 O 5 or does not make it an essential component.
[0004]
[Means for Solving the Problems]
As a result of intensive studies and studies to solve the above problems, the present inventor has added Li 2 O and Y 2 O 3 to SiO 2 —B 2 O 3 —CaO—La 2 O 3 glass having a specific composition range. It has been found that the above object can be achieved by adding it as an essential component, and the present invention has been made.
[0006]
That is, the feature of the optical glass of the present invention for achieving the above object, as described in claim 1, in weight%, SiO 2 6~15%, B 2 O 3 40~50%, Al 2 O 3 0.3~5%, La 2 O 3 10~25 %, Y 2 O 3 1~12%, however, La 2 O 3 + Y 2 O 3 15~30%, CaO 18~25%, Li 2 O 0 Over 0.5% to less than 0.5%, MgO 0-5%, SrO 0-5%, BaO 0-10%, ZnO 0-10% ZrO 2 0-5%, Ta 2 O 5 0-5% and Sb 2 O 3 is composed of 0 to 0.5% and does not contain TiO 2 , Nb 2 O 5 and WO 3 .
[0007]
Further, as described in
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The reason why each component of the optical glass of the present invention is limited to the above composition range will be described below.
The SiO 2 and B 2 O 3 components are glass-forming oxides, and are effective in widening the vitrification range and imparting an appropriate viscosity to the glass in the present invention. When the amount of the SiO 2 component is 5% or less, the above effect is insufficient. When the amount exceeds 20%, the meltability of the mixed raw material is deteriorated and an unmelted product is likely to be generated. Further, when the amount of the B 2 O 3 component is less than 35% or exceeds 55%, it becomes difficult to obtain a glass having a desired refractive index. In order to obtain glass with particularly good homogeneity, it is preferable that the amount of the SiO 2 component is 6 to 15% and the amount of the B 2 O 3 component is 40 to 50%. Furthermore, in order to obtain a more stable glass, the total amount of the SiO 2 component and the B 2 O 3 component is more preferably 50% or more.
[0009]
The Al 2 O 3 component is effective in improving the chemical durability of the glass, adjusting the viscosity, and stabilizing against devitrification. However, when the amount is 10% or more, devitrification increases, which is not preferable. A more preferred amount is 0.3 to 5%.
[0010]
The La 2 O 3 component improves the chemical durability and devitrification resistance of the glass and increases the refractive index without increasing the dispersion too much, and is effective in obtaining a stable glass having a high refractive index. It is an ingredient. If the amount is less than 10%, the chemical durability and devitrification resistance of the glass are insufficient, and if it exceeds 30%, the desired refractive index cannot be obtained. In order to obtain a homogeneous glass having a desired optical constant and no devitrification, the amount of La 2 O 3 component is more preferably in the range of 10 to 25%.
[0011]
The Y 2 O 3 component improves the chemical durability and devitrification resistance of the glass in the same way as the La 2 O 3 component, increases the refractive index without increasing dispersion, and reduces the specific gravity. It is an effective ingredient. If the amount is less than 0.5%, the above effect is not sufficient, and if it exceeds 15%, the temperature at which crystals are precipitated increases, and the glass tends to devitrify. A more preferable range of the amount of the Y 2 O 3 component is 1 to 12%.
Furthermore, in the present invention, in order to obtain a more stable glass, the total amount of the La 2 O 3 component and the Y 2 O 3 component is preferably 15 to 30%.
[0012]
The CaO component is effective in improving the chemical durability, devitrification resistance, and meltability of the glass raw material. If the amount of the CaO component is less than 10%, the above effect is not sufficient, and it is difficult to obtain a desired optical constant. Moreover, when the amount exceeds 30%, the devitrification tendency increases, which is not preferable. A more preferable amount of the CaO component is 18 to 25%.
[0013]
In the present invention, the Li 2 O component is an essential component effective for accelerating the melting of the glass raw material, but in order to obtain the above effect, its amount is sufficient to be less than 0.5%. Also, a part of the Li 2 O component can be replaced with one or both of the Na 2 O and K 2 O components.
[0014]
Each component of MgO, SrO, BaO and ZnO is effective for adjusting the refractive index and Abbe number of the glass, improving the melting property of the glass raw material and improving the devitrification resistance. %, And up to 15% each of BaO and ZnO components. The amounts of the BaO and ZnO components are more preferably up to 10% each.
[0015]
In order to adjust the refractive index and the Abbe number or improve the stability of the glass, the glass of the present invention may optionally contain TiO 2 , ZrO 2 , Nb 2 O 5 , Ta 2 O 5 and WO 3 components. However, it is sufficient that the amount of TiO 2 component is 3% and that of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 and WO 3 components is 5% each. However, since TiO 2 , Nb 2 O 5 and WO 3 components tend to lower the light transmittance of the glass on the short wavelength side, it is more preferable not to contain these components.
[0016]
The Sb 2 O 3 component can be optionally added as a fining agent during glass melting, but its amount is sufficient to be 1% or less, and a more appropriate amount is 0.5% or less.
Further, in addition to the above components, the glass of the present invention may be added up to 5% in an extra proportion with components such as fluorides of metal elements and P 2 O 5 contained in each of the above metal oxide components. Absent.
[0017]
【Example】
Next, Examples (No. 1 to No. 4) of the optical glass according to the present invention and Comparative Examples (No. A) of the conventional glass are used as the refractive index (nd), Abbe number (νd) of these glasses, devitrification temperature (° C.), with a weight ratio of Y 2 O 3 with respect to the specific gravity and La 2 O 3 shown in Table 1, the embodiment (No.1~No.4) and comparative examples of glass (No. a) The relationship between the content of the Y 2 O 3 component and the devitrification temperature (° C.) is shown in FIG. The devitrification temperature is determined by placing each glass fragment obtained in a small hole provided in a platinum plate, melting it in a temperature-gradient furnace and holding it for 30 minutes, then taking it out of the furnace, and examining the crystal generation state with a microscope. The result obtained by observation is shown. Further, other examples (No. 5 to No. 23 ) of the optical glass according to the present invention are shown in Tables 2, 3, 4, and 5 together with the refractive index (nd) and Abbe number (νd) of these glasses. Shown in
[0018]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
[Table 5]
As can be seen in Table 1 and FIG. 1, the glass of the example of the present invention has a low devitrification temperature and excellent devitrification resistance and a low specific gravity as compared with the glass of the comparative example. Moreover, the glass of the said Example is excellent in a meltability, the homogeneous glass without a bubble and a striae is obtained, and chemical durability is also favorable. Moreover, the glass of the Example of this invention shown in Table 2-Table 6 is similarly excellent in devitrification resistance, a meltability, and chemical durability, and its specific gravity is small.
The glass of the Example of said Table 1-Table 6 concerning this invention mixes and mixes ordinary optical glass raw materials, such as an oxide, carbonate, hydroxide, nitrate, and fluoride, and uses a platinum crucible etc., It can be easily produced by melting, clarifying and stirring at about 1200 ° C. to 1400 ° C. for about 2 to 4 hours, then casting into a preheated mold or the like and slow cooling.
[0025]
【The invention's effect】
As described above, the optical glass of the present invention is a glass with the addition of Li 2 O and Y 2 O 3 as an essential component in SiO 2 -B 2 O 3 -CaO- La 2 O 3 based glass having a specific composition range , Having a refractive index (nd) of 1.60 to 1.68, an Abbe number (νd) of 55 or more, excellent devitrification resistance and meltability, and good chemical durability. A stable and homogeneous optical glass can be obtained. Furthermore, the optical glass of the present invention does not contain a Gd 2 O 3 component having a high raw material price, does not contain a Ta 2 O 5 component as an essential component, and is useful in that it can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a diagram showing the relationship between the content of a Y 2 O 3 component and the devitrification temperature (° C.).
Claims (2)
ＳｉＯ2 ６〜１５％、
Ｂ2Ｏ3 ４０〜５０％、
Ａｌ2Ｏ3 ０．３〜５％、
Ｌａ2Ｏ3 １０〜２５％、
Ｙ2Ｏ3 １〜１２％、ただし、Ｌａ2Ｏ3＋Ｙ2Ｏ3 １５〜３０％、
ＣａＯ １８〜２５％、
Ｌｉ2Ｏ ０％を超え０．５％未満まで、
ＭｇＯ ０〜５％、
ＳｒＯ ０〜５％、
ＢａＯ ０〜１０％、
ＺｎＯ ０〜１０％
ＺｒＯ2 ０〜５％、
Ｔａ2Ｏ5 ０〜５％およびＳｂ2Ｏ3 ０〜０．５％の組成からなり、ＴｉＯ2 、Ｎｂ2Ｏ5およびＷＯ3を含有しないことを特徴とする光学ガラス。 % By weight
SiO 2 6~15%,
B 2 O 3 40-50%,
Al 2 O 3 0.3-5%,
La 2 O 3 10-25%,
Y 2 O 3 1-12%, but La 2 O 3 + Y 2 O 3 15-30%,
CaO 18-25%,
Li 2 O over 0% to less than 0.5%,
MgO 0-5%,
SrO 0-5%,
BaO 0-10%,
ZnO 0-10%
ZrO 2 0-5%,
Ta 2 O 5 An optical glass having a composition of 0 to 5% and Sb 2 O 3 of 0 to 0.5% and containing no TiO 2 , Nb 2 O 5 and WO 3 .
ＳｉＯ2 ６〜１５％、
Ｂ2Ｏ3 ４０〜５０％、ただし、ＳｉＯ2＋Ｂ2Ｏ3 ５０％以上、
Ａｌ2Ｏ3 ０．３〜５％、
Ｌａ2Ｏ3 １０〜２５％、
Ｙ2Ｏ3 １〜１２％、ただし、Ｌａ2Ｏ3＋Ｙ2Ｏ3 １５〜３０％、
ＣａＯ １８〜２５％、
Ｌｉ2Ｏ ０％を超え０．５％未満まで、
ＭｇＯ ０〜５％、
ＳｒＯ ０〜５％、
ＢａＯ ０〜１０％、
ＺｎＯ ０〜１０％
ＺｒＯ2 ０〜５％、
Ｔａ2Ｏ5 ０〜５％およびＳｂ2Ｏ3 ０〜０．５％の組成からなり、ＴｉＯ2 、Ｎｂ2Ｏ5およびＷＯ3を含有しないことを特徴とする光学ガラス。 % By weight
SiO 2 6~15%,
B 2 O 3 40-50%, but SiO 2 + B 2 O 3 50% or more,
Al 2 O 3 0.3-5%,
La 2 O 3 10-25%,
Y 2 O 3 1-12%, but La 2 O 3 + Y 2 O 3 15-30%,
CaO 18-25%,
Li 2 O over 0% to less than 0.5%,
MgO 0-5%,
SrO 0-5%,
BaO 0-10%,
ZnO 0-10%
ZrO 2 0-5%,
An optical glass having a composition of Ta 2 O 5 0 to 5% and Sb 2 O 3 0 to 0.5% and not containing TiO 2 , Nb 2 O 5 and WO 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23250998A JP4219012B2 (en) | 1997-09-01 | 1998-08-19 | Optical glass |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25128897 | 1997-09-01 | ||
| JP9-251288 | 1997-09-01 | ||
| JP23250998A JP4219012B2 (en) | 1997-09-01 | 1998-08-19 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11139844A JPH11139844A (en) | 1999-05-25 |
| JP4219012B2 true JP4219012B2 (en) | 2009-02-04 |
Family
ID=26530497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23250998A Expired - Lifetime JP4219012B2 (en) | 1997-09-01 | 1998-08-19 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4219012B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4839563B2 (en) | 2000-02-18 | 2011-12-21 | 株式会社ニコン | Optical glass and projection exposure apparatus using the same |
| JP3982752B2 (en) * | 2002-07-03 | 2007-09-26 | Ｈｏｙａ株式会社 | Optical glass, preform for press molding, and optical element |
| JP2006056769A (en) * | 2004-07-23 | 2006-03-02 | Nippon Sheet Glass Co Ltd | Glass composition for sealing, glass frit for sealing, and glass sheet for sealing |
| CN102311229A (en) * | 2011-09-07 | 2012-01-11 | 成都光明光电股份有限公司 | Optical glass and optical element |
| CN104307509A (en) * | 2014-10-24 | 2015-01-28 | 桂林理工大学 | Visible light-responsive photocatalyst Li3LaWO6 and its preparation method |
| CN104437462A (en) * | 2014-12-28 | 2015-03-25 | 桂林理工大学 | Visible light responsive photocatalyst Li2La3NdSb2O12 and its preparation method |
| CN104492451A (en) * | 2014-12-28 | 2015-04-08 | 桂林理工大学 | A visible light responsive photocatalyst Sm2Fe2W3O15 and its preparation method |
| TWI752046B (en) * | 2016-06-29 | 2022-01-11 | 日商小原股份有限公司 | Optical Glass, Preforms and Optical Components |
-
1998
- 1998-08-19 JP JP23250998A patent/JP4219012B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11139844A (en) | 1999-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2700512B2 (en) | High dispersion optical glass | |
| CN101386469B (en) | High refraction and low dispersion optical glass | |
| JP2565813B2 (en) | Optical glass | |
| JP2668049B2 (en) | Optical glass | |
| JP2004175632A (en) | Optical glass | |
| JPH0149649B2 (en) | ||
| JPH0243692B2 (en) | ||
| JPH0723231B2 (en) | Optical and ophthalmic glass | |
| JPS5860640A (en) | Optical glass | |
| JPH1143344A (en) | Optical glass | |
| JP4219012B2 (en) | Optical glass | |
| JP2018052764A (en) | Optical glass, preform and optical element | |
| JP2795334B2 (en) | Optical glass | |
| JP2001072432A (en) | Optical glass | |
| JP3765594B2 (en) | Optical glass | |
| JP2000128570A (en) | Optical glass | |
| JP3130245B2 (en) | Optical glass | |
| JP3987174B2 (en) | Optical glass for precision press molding | |
| JP3521942B2 (en) | Optical glass for precision press molding | |
| JP4024907B2 (en) | Optical glass | |
| JP2004175592A (en) | Optical glass | |
| JP3245516B2 (en) | Optical glass | |
| JP2004168593A (en) | Optical glass | |
| JP4160158B2 (en) | Optical glass | |
| JP2000026133A (en) | Lead-free lanthanum crown glass and lanthanum flint glass |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050523 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071102 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071204 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080130 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080605 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080728 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20080812 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20080728 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080916 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080916 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20081028 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20081111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 3 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313532 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111121 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121121 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121121 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121121 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20131121 Year of fee payment: 5 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| 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 |