JP2000247678A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JP2000247678A JP2000247678A JP5293999A JP5293999A JP2000247678A JP 2000247678 A JP2000247678 A JP 2000247678A JP 5293999 A JP5293999 A JP 5293999A JP 5293999 A JP5293999 A JP 5293999A JP 2000247678 A JP2000247678 A JP 2000247678A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- optical
- range
- optical glass
- component
- 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.)
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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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- 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)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、光学ガラス、特に
モールドプレス成形に適した光学ガラスに関する。The present invention relates to an optical glass, and more particularly to an optical glass suitable for mold press molding.
【0002】[0002]
【従来の技術】従来より、モールドプレス成形は、光学
ガラスの有用な加工方法として多く利用されている。特
に、精密モールドプレス成形は、プレス成形後に研削や
研磨を必要とせず、直接レンズ等の光学素子を得ること
ができ、製造工程を簡略化できることから、近年、有用
性が高まっている。このようなモールドプレス成形にお
いては、ガラスの成形温度が高温になると、成形型の耐
久性が低下したり、ガラスが成形型に焼き付くことによ
ってガラスの型に対する離型性が悪くなる、といった問
題が生じるため、ガラスの屈伏点(At)は、できるだ
け、低いことが望ましい。2. Description of the Related Art Conventionally, mold press molding has been widely used as a useful processing method for optical glass. In particular, precision mold press molding has recently gained utility because it does not require grinding or polishing after press molding, and can directly obtain an optical element such as a lens and can simplify the manufacturing process. In such a mold press molding, when the molding temperature of the glass is high, the durability of the molding die is reduced, and the releasability of the glass from the mold is deteriorated by burning of the glass into the molding die. Therefore, it is desirable that the yield point (At) of the glass is as low as possible.
【0003】一方、レンズ等に用いられる光学ガラス
は、種々の光学定数を有するものが求められており、そ
の中で、所望の光学定数、具体的には、屈折率(nd)
が1.47〜1.53、アッベ数(νd)が60〜68
の範囲を有するものも求められている。このような光学
定数を有する光学ガラスとして、種々の硼珪酸クラウン
系あるいはバリウムクラウン系ガラスが知られており、
たとえば、「ガラス組成データブック・1991年版
(日本硝子製品工業会発行)」には、硼珪酸クラウン系
ガラスとして、BK(ショットグラスヴェルケ社商品
名)タイプのガラスが、またバリウムクラウン系ガラス
としてBaLK(ショットグラスヴェルケ社商品名)タ
イプのガラスが記載されている。On the other hand, optical glasses used for lenses and the like are required to have various optical constants. Among them, a desired optical constant, specifically, a refractive index (nd) is required.
1.47 to 1.53, Abbe number (νd) 60 to 68
Are also required. As optical glasses having such an optical constant, various borosilicate crown-based or barium crown-based glasses are known,
For example, in the "Glass Composition Data Book, 1991 Edition (published by the Japan Glass Products Industries Association)", BK (Shotgrass-Werke, Inc.) type glass is used as a borosilicate crown glass, and barium crown glass is used as a barium crown glass. A glass of BaLK (trade name of Shotgrass-Werke) is described.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、これら
BKタイプやBaLKタイプのガラスは、一般に、屈伏
点(At)が高く、これらの多くは550℃を超え、成
形温度が高いため、モールドプレス成形用ガラスとして
は、不適当であるという問題点がある。However, these BK-type and BaLK-type glasses generally have a high yield point (At), and most of them exceed 550 ° C., and have high molding temperatures. There is a problem that the glass is unsuitable.
【0005】上記に挙げた問題点を解決するため、R2
O(アルカリ金属酸化物)を含有するガラスが提案され
ている。たとえば、特開平5−193979号公報に
は、SiO2−B2O3−Al2O3系の組成にR2O(アル
カリ金属酸化物)を導入した光学ガラスが開示されてる
が、この光学ガラスは、化学的耐久性、特に、耐酸性が
悪いという欠点がある。In order to solve the above problems, R 2
Glasses containing O (alkali metal oxide) have been proposed. For example, Japanese Patent Application Laid-Open No. Hei 5-193977 discloses an optical glass in which R 2 O (alkali metal oxide) is introduced into a SiO 2 —B 2 O 3 —Al 2 O 3 composition. Glass has the disadvantage of poor chemical durability, especially acid resistance.
【0006】本発明は、上記課題に鑑み、屈折率(n
d)が1.47〜1.53、アッベ数(νd)が60〜
68の範囲の光学定数を有し、屈伏点(At)が低く、
成形型との離型性が良好であり、高い化学的耐久性、特
に優れた耐酸性を有する光学ガラスを提供することを目
的とする。SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a refractive index (n)
d) is 1.47 to 1.53, Abbe number (νd) is 60 to
Having an optical constant in the range of 68, a low yield point (At),
An object of the present invention is to provide an optical glass which has good releasability from a molding die and has high chemical durability, particularly excellent acid resistance.
【0007】[0007]
【課題を解決するための手段】以上の課題を解決すべ
く、本発明者等は、鋭意試験研究を重ねた結果、従来の
技術には具体的に開示されていない、特定の組成範囲を
有する、SiO2−B2O 3−Al2O3−R2O(アルカリ
金属酸化物)系ガラスにTiO2成分を添加することに
より、上記課題を解決する特性を有する光学ガラスが得
られることを見出し、本発明をなすに至った。[Means for Solving the Problems] The above problems should be solved.
In addition, the present inventors have conducted intensive research and studies and found that
Specific composition ranges not specifically disclosed in the technology
Having, SiOTwo-BTwoO Three-AlTwoOThree-RTwoO (alkali
TiO to metal oxide) based glassTwoTo add the ingredients
As a result, an optical glass having characteristics that solve the above-mentioned problems is obtained.
And found that the present invention was achieved.
【0008】すなわち、請求項1に記載の本発明の光学
ガラスは、重量%で、SiO2 60〜65%、B2O3
14〜19%、Al2O3 5〜9%、Li2O 2〜6.
5%、Na2O 4〜7%、K2O 2〜6.5% ただし、Li2O+Na2O+K2O 11〜16%、T
iO2 0.05〜1%未満、Sb2O3 0〜2%、の範
囲の各成分を含有し、屈折率(nd)が1.47〜1.
53、アッベ数(νd)が60〜68の範囲の光学定数
を有することを特徴とする。That is, the optical glass according to the first aspect of the present invention has a SiO 2 content of 60 to 65% by weight and a B 2 O 3 content by weight%.
14~19%, Al 2 O 3 5~9 %, Li 2 O 2~6.
5%, Na 2 O 4 to 7%, K 2 O 2 to 6.5% However, Li 2 O + Na 2 O + K 2 O 11 to 16%, T
iO less than 2 from 0.05 to 1%, and containing the respective components of Sb 2 O 3 0 to 2% range, the refractive index (nd) of 1.47 to 1.
53, characterized in that the Abbe number (νd) has an optical constant in the range of 60 to 68.
【0009】また、請求項2に記載の本発明の光学ガラ
スは、重量%で、SiO2 60〜65%、B2O3 14
〜19%、ただし、重量比で、B2O3/SiO2≦0.
31、Al2O3 5〜9%、ただし、SiO2+B2O3+
Al2O3≧83% Li2O 2〜6.5%、Na2O 4〜7%、K2O
2〜6.5% ただし、Li2O+Na2O+K2O 11〜16%、T
iO2 0.05〜1%未満、Sb2O3 0〜2%、の範
囲の各成分を含有し、屈折率(nd)が1.47〜1.
53、アッベ数(νd)が60〜68の範囲の光学定数
を有することを特徴とする。Further, the optical glass of the present invention according to claim 2 has a SiO 2 content of 60 to 65% by weight and a B 2 O 3 14 by weight%.
1919%, provided that B 2 O 3 / SiO 2 ≦ 0.
31, Al 2 O 3 5 to 9%, provided that SiO 2 + B 2 O 3 +
Al 2 O 3 ≧ 83% Li 2 O 2 to 6.5%, Na 2 O 4 to 7%, K 2 O
2 to 6.5%, however, Li 2 O + Na 2 O + K 2 O 11~16%, T
iO less than 2 from 0.05 to 1%, and containing the respective components of Sb 2 O 3 0 to 2% range, the refractive index (nd) of 1.47 to 1.
53, characterized in that the Abbe number (νd) has an optical constant in the range of 60 to 68.
【0010】また、請求項3に記載の本発明の光学ガラ
スは、粉末法による光学ガラスの耐酸性の測定方法によ
り算出されるガラスの減量率が0.35重量%未満であ
ることを特徴とする。なお、ここで上記粉末法による光
学ガラスの耐酸性の測定方法は、日本光学硝子工業会規
格;JOGIS06−1975光学ガラスの化学的耐久性の
測定方法(粉末法)に規定されている方法である。The optical glass of the present invention according to claim 3 is characterized in that the weight loss of the glass calculated by a method for measuring the acid resistance of the optical glass by a powder method is less than 0.35% by weight. I do. Here, the measurement method of the acid resistance of the optical glass according to the powder method, Japanese Optical Glass Industrial Standard; is a method as defined in JOGIS06- 1975 chemical durability of the measurement method of the optical glass (powder method) .
【0011】本発明によれば、ガラス組成が、SiO2
−B2O3−Al2O3−R2O(アルカリ金属酸化物)−
TiO2系であることから、屈折率(nd)が1.47
〜1.53、アッベ数(νd)が60〜68の範囲の光
学定数を有し、屈伏点(At)が低く、高い化学的耐久
性、特に優れた耐酸性を有し、加えて、耐失透性に優
れ、均質化しやすい光学ガラスとなる。According to the present invention, the glass composition is SiO 2
—B 2 O 3 —Al 2 O 3 —R 2 O (alkali metal oxide) —
Since it is a TiO 2 system, the refractive index (nd) is 1.47.
It has an optical constant in the range of 1.5 to 1.53 and an Abbe number (νd) of 60 to 68, a low yield point (At), high chemical durability, particularly excellent acid resistance. An optical glass with excellent devitrification and easy to homogenize.
【0012】[0012]
【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は、以下のとおりで
ある。BEST MODE FOR CARRYING OUT THE INVENTION The reasons for limiting each component to the above-mentioned composition range in the optical glass of the present invention are as follows.
【0013】SiO2成分は、ガラス相を形成する酸化
物として必須の成分であるが、その量が60%未満では
ガラスの化学的耐久性が劣化し、65%を超えると精密
なモールド成形に適した低屈伏点が得られなくなる。The SiO 2 component is an essential component as an oxide forming a glass phase, but if its amount is less than 60%, the chemical durability of the glass will be deteriorated, and if it exceeds 65%, it will be necessary to form a precise mold. A suitable low yield point cannot be obtained.
【0014】B2O3成分も、ガラス形成酸化物として重
要な成分であり、また、ガラスの溶融時の粘度を適度な
大きさとするのに有効な必須成分であるが、14%未満
では溶融粘度が高すぎて均質なガラスを得ることが困難
になり、19%を超えると、化学的耐久性が劣化する。The B 2 O 3 component is also an important component as a glass-forming oxide, and is also an essential component effective for adjusting the viscosity of the glass to an appropriate level when it is melted. If the viscosity is too high, it is difficult to obtain a homogeneous glass. If it exceeds 19%, the chemical durability deteriorates.
【0015】また、特に化学的耐久性に優れたガラスを
得るためには、SiO2成分に対するB2O3成分の重量
比を0.31以下とすべきである。In order to obtain a glass having particularly excellent chemical durability, the weight ratio of the B 2 O 3 component to the SiO 2 component should be 0.31 or less.
【0016】Al2O3成分は、ガラスの化学的耐久性を
向上させ、ガラスの分相を防止するために有効である
が、5%未満ではその効果が十分ではなく、9%を超え
るとガラスの屈伏点が上昇するうえ、ガラスの成形時の
粘度が高くなり、また、耐失透性も悪化する。The Al 2 O 3 component is effective for improving the chemical durability of the glass and preventing the phase separation of the glass. However, if the content is less than 5%, the effect is not sufficient, and if it exceeds 9%, the effect is insufficient. The yield point of the glass increases, the viscosity of the glass at the time of molding increases, and the devitrification resistance also deteriorates.
【0017】また、目的の範囲内の屈折率およびアッベ
数を有し、精密なモールドプレス成形に適した低屈伏点
および粘度を有し、かつ、特に優れた化学的耐久性や耐
失透性を得るためには、SiO2成分、B2O3成分およ
びAl2O3成分の合計量を83%以上とすべきである。Further, it has a refractive index and Abbe number within the intended range, has a low yield point and viscosity suitable for precise mold press molding, and has particularly excellent chemical durability and devitrification resistance. In order to obtain, the total amount of the SiO 2 component, the B 2 O 3 component, and the Al 2 O 3 component should be 83% or more.
【0018】R2O(アルカリ金属酸化物)成分である
Li2O成分、Na2O成分、およびK2O成分は、ガラ
スの屈伏点を下げる効果を有し、ガラス製造時の溶融性
を向上させる重要な成分であり、これら効果を得るた
め、Li2O成分、Na2O成分、およびK2O成分を合
計で、11〜16%の範囲で含有することが好ましい。The R 2 O (alkali metal oxide) components, Li 2 O component, Na 2 O component and K 2 O component, have the effect of lowering the yield point of the glass and reduce the melting property during glass production. is an important component for improving, for obtaining these effects, Li 2 O component, a total of Na 2 O component and the K 2 O component, is preferably contained in the range 11-16%.
【0019】これらの成分のうち、Li2O成分は、ガ
ラスの屈伏点を下げる効果が極めて大きい重要な成分で
あり、ガラスの耐失透性および化学的耐久性を維持しつ
つ、その効果を得るために、含有量を2〜6.5%の範
囲とすべきである。Among these components, the Li 2 O component is an important component having an extremely large effect of lowering the yield point of glass, and its effect is maintained while maintaining the devitrification resistance and chemical durability of glass. To obtain, the content should be in the range of 2 to 6.5%.
【0020】また、化学的耐久性を損なわず、低屈伏点
特性を得るために、Na2O成分は4〜7%の範囲とす
べきであり、K2O成分は2〜6.5%の範囲とすべき
である。Further, in order to obtain low yield point characteristics without impairing chemical durability, the Na 2 O component should be in the range of 4 to 7%, and the K 2 O component should be in the range of 2 to 6.5%. Should be in the range.
【0021】TiO2成分は、ガラスのソーラリゼーシ
ョンによる着色の防止、化学的耐久性の向上および所望
の光学定数を有するために必要な成分であるが、その量
が0.05%未満ではこれらの効果が得られず、1%以
上では光線透過性が劣化するので好ましくない。The TiO 2 component is a component necessary to prevent coloring of the glass by solarization, to improve the chemical durability, and to have a desired optical constant. Cannot be obtained, and if it is 1% or more, the light transmittance is undesirably deteriorated.
【0022】Sb2O3成分は、ガラスの清澄剤として任
意に添加することができるが、この効果を得るために
は、含有量は2%までで十分である。The Sb 2 O 3 component can be arbitrarily added as a fining agent for glass, but in order to obtain this effect, its content is sufficient up to 2%.
【0023】さらに、本発明の光学ガラスは、上記以外
の成分を、光学定数の調整、ガラスの溶融性、化学的耐
久性および耐失透性の改善のために必要に応じて含有し
ていてもよく、たとえば、MgO、CaO、SrO、B
aO、ZrO2およびF2等の成分を合計で3%まで、含
有してもよい。Further, the optical glass of the present invention contains components other than those described above as necessary for adjusting the optical constant, improving the melting property, chemical durability and devitrification resistance of the glass. For example, MgO, CaO, SrO, B
Components such as aO, ZrO 2 and F 2 may be contained up to a total of 3%.
【0024】上記組成からなる本発明の光学ガラスは、
酸化物、炭酸塩、硝酸塩、および水酸化物等の原料を、
上記組成を有するように、所定の割合で混合した後、1
200〜1400℃の温度で約2〜4時間溶融脱泡し、
撹拌均質化した後、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。The optical glass of the present invention having the above composition is as follows:
Raw materials such as oxides, carbonates, nitrates, and hydroxides,
After mixing at a predetermined ratio so as to have the above composition, 1
Melt and defoam at a temperature of 200 to 1400 ° C. for about 2 to 4 hours,
After homogenizing with stirring, it can be easily manufactured by casting in a mold or the like and slowly cooling.
【0025】[0025]
【実施例】以下、本発明を実施例に基づいて説明する
が、本発明はこれら実施例に限定されるものではない。EXAMPLES Hereinafter, the present invention will be described based on examples, but the present invention is not limited to these examples.
【0026】本発明に係る光学ガラスの実施例(No.
1〜No.15)の組成を、屈折率(nd)、アッベ数
(νd)、屈伏点(At)、ガラス転移点(Tg)およ
び粉末法耐酸性「RA(P)」を示す級とともに、表
1、表2および表3に示した。また、従来例として挙げ
た特開平5−193979号公報中の実施例と同様の組
成を有するガラスを、比較例(No.1、No.2)と
して挙げ、表3に組成と光学定数等のデータを示した。
なお、ここで、粉末法耐酸性「RA(P)」を示す級の
値は、前記日本光学硝子工業会規格;JOGIS06−
1975光学ガラスの化学的耐久性の測定方法(粉末法)に
より、次のようにして求めた。実施例(No.1〜N
o.15)、比較例(No.1およびNo.2)のガラ
スを、それぞれ、粒度420〜590μmに粉砕し、得
られたガラス粉末試料を白金製の溶出用かごの中に、比
重グラム入れた。次に、上記ガラス粉末試料を入れた溶
出用かごを、0.01N硝酸水溶液80mlが入ってい
る石英ガラス製の丸底フラスコに入れて、沸騰水浴中で
60分間処理した後、溶出用かごを丸底フラスコから取
り出し、ガラス粉末試料の最初の質量と、その減量から
算出した減量率(重量%)に基づいて、以下のように等
級付けした。すなわち、減量率(重量%)が、0.20
%未満である場合には1級とし、0.20〜0.35%
未満は2級、0.35〜0.65%未満は3級、0.6
5〜1.20%未満は4級、1.20〜2.20%未満
は5級とした。つまり、表1、表2および表3ではRA
(P)を示す級の値が小さいほど、耐酸性が高く、化学
的耐久性が優れていることを示している。Examples of the optical glass according to the present invention (No.
1 to No. Table 15 shows the composition of 15) along with the refractive index (nd), Abbe number (νd), yield point (At), glass transition point (Tg), and the class indicating the powder method acid resistance “RA (P)”. 2 and Table 3. Further, glass having the same composition as that of the example in JP-A-5-193977, which was cited as a conventional example, is cited as a comparative example (No. 1, No. 2), and Table 3 shows the composition and optical constants. Data are shown.
Here, the value of the class indicating the acid resistance “RA (P)” of the powder method is based on the Japan Optical Glass Industry Association standard; JOGIS06-
It was determined as follows by a method of measuring the chemical durability of the 1975 optical glass (powder method). Example (No. 1 to N
o. 15) and the glasses of Comparative Examples (No. 1 and No. 2) were each ground to a particle size of 420 to 590 μm, and the obtained glass powder sample was placed in a platinum elution basket in a specific gravity gram. Next, the elution basket containing the glass powder sample was placed in a quartz glass round bottom flask containing 80 ml of a 0.01 N nitric acid aqueous solution, and treated in a boiling water bath for 60 minutes. The glass powder sample was taken out from the round bottom flask, and was graded as follows based on the initial weight of the glass powder sample and the weight loss rate (% by weight) calculated from the weight loss. That is, the weight loss rate (% by weight) is 0.20
%, It is grade 1 and 0.20 to 0.35%
Less than 2nd grade, 0.35 to 0.65% less than 3rd grade, 0.6
If less than 5 to 1.20%, it was quaternary, and if less than 1.20 to 2.20%, it was grade 5. That is, in Tables 1, 2 and 3, RA
The smaller the value of the class indicating (P), the higher the acid resistance and the higher the chemical durability.
【0027】実施例(No.1〜No.15)と、比較
例(No.1、No.2)の各ガラスは、表1、表2お
よび表3中の組成になるように、酸化物、炭酸塩、硝酸
塩、および水酸化物等を混合したものを、白金坩堝に投
入し、それぞれの組成によって決まる溶融性の程度に応
じて、1200〜1400℃の温度で、2〜4時間溶融
脱泡し、撹拌・均質化した後、金型に流し、徐冷するこ
とにより、製造した。得られたガラスは、透明で均質な
ものであった。Each of the glasses of Examples (No. 1 to No. 15) and Comparative Examples (No. 1 and No. 2) had oxides so that the compositions shown in Tables 1, 2 and 3 were obtained. , Carbonates, nitrates, hydroxides, and the like are charged into a platinum crucible and melted at a temperature of 1200 to 1400 ° C. for 2 to 4 hours depending on the degree of meltability determined by each composition. After foaming, stirring and homogenizing, the mixture was poured into a mold and slowly cooled to produce the product. The resulting glass was clear and homogeneous.
【0028】[0028]
【表1】 [Table 1]
【0029】[0029]
【表2】 [Table 2]
【0030】[0030]
【表3】 [Table 3]
【0031】上記表1、表2および表3より、本発明の
実施例(No.1〜No.15)の光学ガラスは、屈折
率(nd)1.47〜1.53、アッベ数(νd)60
〜68の範囲内の光学定数を有し、光学ガラスとして十
分に利用できるものであることが分かる。また、屈伏点
(At)も550℃未満であり、特に、実施例No.
4、No.9、No.14等では、屈伏点(At)が5
00℃未満で、モールドプレス成形用として好適であ
り、成形型との離型性も良好なものとなる。また、表
1、表2および表3に示した本発明の実施例(No.1
〜No.15)の光学ガラスは、いずれも、RA(P)
が1級または2級であって、減量率が0.35重量%未
満であり、比較例(No.1、No.2)のガラスより
一段と優れた耐酸性を有し、化学的耐久性に優れている
ことが分かる。From the above Tables 1, 2 and 3, the optical glasses of Examples (No. 1 to No. 15) of the present invention have a refractive index (nd) of 1.47 to 1.53 and an Abbe number (νd). ) 60
It can be seen that it has an optical constant in the range of ~ 68 and can be sufficiently used as an optical glass. Also, the yield point (At) is less than 550 ° C.
4, no. 9, No. At 14 mag, the yield point (At) is 5
When the temperature is lower than 00 ° C., it is suitable for mold press molding, and the releasability from a molding die is also good. Examples (No. 1) of the present invention shown in Table 1, Table 2 and Table 3
-No. The optical glass of 15) is RA (P)
Is primary or secondary, has a weight loss of less than 0.35% by weight, has more excellent acid resistance than the glass of Comparative Examples (No. 1, No. 2), and has chemical durability. It turns out that it is excellent.
【0032】[0032]
【発明の効果】以上述べたように、本発明に係る光学ガ
ラスは、特定組成範囲のSiO2−B2O3−Al2O3−
R2O(アルカリ金属酸化物)−TiO2系のガラスであ
ることから、屈折率(nd)が1.47〜1.53、ア
ッベ数(νd)が60〜68の範囲の光学定数を有し、
屈伏点(At)が低く、成形型との離型性が良好であ
り、光学製品を得るためのモールドプレス成形、特にレ
ンズ等を製造するための精密モールドプレス成形に大変
適している。そのうえ化学的耐久性、特に耐酸性に優
れ、また、高い耐失透性を有し、均質化しやすいため、
高品質なガラスを量産するのに適している。As described above, the optical glass according to the present invention has a specific composition range of SiO 2 —B 2 O 3 —Al 2 O 3 —
Since it is an R 2 O (alkali metal oxide) -TiO 2 glass, it has an optical constant with a refractive index (nd) of 1.47 to 1.53 and an Abbe number (νd) of 60 to 68. And
It has a low yield point (At) and good releasability from a mold, and is very suitable for mold press molding for obtaining optical products, particularly precision mold press molding for manufacturing lenses and the like. In addition, it has excellent chemical durability, especially acid resistance, and also has high devitrification resistance and is easy to homogenize.
Suitable for mass production of high quality glass.
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 4G062 AA04 BB05 DA06 DB03 DC04 DD01 DE01 DF01 EA03 EB03 EC03 ED01 EE01 EF01 EG01 FA01 FB02 FC01 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM02 NN01 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4G062 AA04 BB05 DA06 DB03 DC04 DD01 DE01 DF01 EA03 EB03 EC03 ED01 EE01 EF01 EG01 FA01 FB02 FC01 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GA10 GB01 HGAH HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ04 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM02 NN01
Claims (3)
1.53、アッベ数(νd)が60〜68の範囲の光学
定数を有することを特徴とする光学ガラス。1. A weight%, SiO 2 60~65%, B 2 O 3 14~19%, Al 2 O 3 5~9%, Li 2 O 2~6.5%, Na 2 O 4~7 %, K 2 O 2 to 6.5% However, each component in the range of Li 2 O + Na 2 O + K 2 O 11 to 16%, TiO 2 0.05 to less than 1%, Sb 2 O 3 0 to 2% Contains, and has a refractive index (nd) of 1.47 to
An optical glass having an optical constant of 1.53 and an Abbe number (νd) in a range of 60 to 68.
1.53、アッベ数(νd)が60〜68の範囲の光学
定数を有することを特徴とする光学ガラス。2. A weight%, SiO 2 60~65%, B 2 O 3 14~19%, however, a weight ratio, B 2 O 3 / SiO 2 ≦ 0.31, Al 2 O 3 5~9 %, Where SiO 2 + B 2 O 3 + Al 2 O 3 ≧ 83% Li 2 O 2 to 6.5%, Na 2 O 4 to 7%, K 2 O 2 to 6.5% However, Li 2 O + Na 2 O + K 2 O 11~16%, TiO 2 less than 0.05 to 1%, and containing the respective components of Sb 2 O 3 0 to 2% range, the refractive index (nd) of 1.47~
An optical glass having an optical constant of 1.53 and an Abbe number (νd) in a range of 60 to 68.
方法により算出されるガラスの減量率が0.35重量%
未満であることを特徴とする請求項1または2に記載の
光学ガラス。3. The glass weight loss calculated by a method for measuring the acid resistance of an optical glass by a powder method is 0.35% by weight.
The optical glass according to claim 1, wherein:
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JP5293999A JP2000247678A (en) | 1999-03-01 | 1999-03-01 | Optical glass |
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Application Number | Priority Date | Filing Date | Title |
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JP5293999A JP2000247678A (en) | 1999-03-01 | 1999-03-01 | Optical glass |
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JP2000247678A true JP2000247678A (en) | 2000-09-12 |
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ID=12928848
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011026157A (en) * | 2009-07-23 | 2011-02-10 | Nippon Electric Glass Co Ltd | Optical glass |
WO2011158774A1 (en) * | 2010-06-15 | 2011-12-22 | 日本電気硝子株式会社 | Optical glass |
CN102515526A (en) * | 2011-11-24 | 2012-06-27 | 中国建筑材料科学研究总院 | Core/sheath glass with good compatibility for rigid optical fiber |
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JP2019135200A (en) * | 2018-02-05 | 2019-08-15 | 株式会社オハラ | Optical glass |
JP2019135202A (en) * | 2018-02-05 | 2019-08-15 | 株式会社オハラ | Optical glass |
CN113277730A (en) * | 2021-06-21 | 2021-08-20 | 成都光明光电有限责任公司 | Low dielectric constant glass composition |
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1999
- 1999-03-01 JP JP5293999A patent/JP2000247678A/en active Pending
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011026157A (en) * | 2009-07-23 | 2011-02-10 | Nippon Electric Glass Co Ltd | Optical glass |
WO2011158774A1 (en) * | 2010-06-15 | 2011-12-22 | 日本電気硝子株式会社 | Optical glass |
JP2012140314A (en) * | 2010-06-15 | 2012-07-26 | Nippon Electric Glass Co Ltd | Optical glass |
CN102947234A (en) * | 2010-06-15 | 2013-02-27 | 日本电气硝子株式会社 | Optical glass |
CN102515526A (en) * | 2011-11-24 | 2012-06-27 | 中国建筑材料科学研究总院 | Core/sheath glass with good compatibility for rigid optical fiber |
CN102515526B (en) * | 2011-11-24 | 2014-07-02 | 中国建筑材料科学研究总院 | Core/sheath glass with good compatibility for rigid optical fiber |
CN110117157A (en) * | 2018-02-05 | 2019-08-13 | 株式会社小原 | Optical glass |
JP2019135200A (en) * | 2018-02-05 | 2019-08-15 | 株式会社オハラ | Optical glass |
JP2019135202A (en) * | 2018-02-05 | 2019-08-15 | 株式会社オハラ | Optical glass |
JP7089887B2 (en) | 2018-02-05 | 2022-06-23 | 株式会社オハラ | Optical glass |
JP2022121479A (en) * | 2018-02-05 | 2022-08-19 | 株式会社オハラ | optical glass |
TWI774910B (en) * | 2018-02-05 | 2022-08-21 | 日商小原股份有限公司 | The use of optical glass |
JP7457061B2 (en) | 2018-02-05 | 2024-03-27 | 株式会社オハラ | optical glass |
CN113277730A (en) * | 2021-06-21 | 2021-08-20 | 成都光明光电有限责任公司 | Low dielectric constant glass composition |
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