JP3100726B2 - Optical glass for precision press molding - Google Patents
Optical glass for precision press moldingInfo
- Publication number
- JP3100726B2 JP3100726B2 JP04010039A JP1003992A JP3100726B2 JP 3100726 B2 JP3100726 B2 JP 3100726B2 JP 04010039 A JP04010039 A JP 04010039A JP 1003992 A JP1003992 A JP 1003992A JP 3100726 B2 JP3100726 B2 JP 3100726B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- glass
- precision press
- temperature
- optical glass
- 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
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
-
- 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
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】[0001]
【産業上の利用分野】本発明は、低温にて精密プレス成
形ができ、精密プレス成形後に研削または研磨を必要と
しない、精密プレス成形用光学ガラスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical glass for precision press molding which can be precision press molded at a low temperature and does not require grinding or polishing after precision press molding.
【０００２】[0002]
【従来の技術】屈折率（ｎｄ）１．５１〜１．５４、ア
ッベ数（νｄ）６２〜６５．５近辺の範囲の光学恒数を
有する、ホウケイクラウンガラス（ＢＫタイプ）として
分類される光学ガラスは、古くから多量に生産され、現
在において最も代表的な光学ガラスとして使用されてい
る。2. Description of the Related Art Optics classified as borosilicate crown glass (BK type) having a refractive index (nd) of 1.51 to 1.54 and an optical constant in the range of Abbe number (νd) of 62 to 65.5. Glass has been produced in large quantities since ancient times and is currently used as the most representative optical glass.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、一般的
にＢＫタイプの光学ガラスはＳｉＯ2 を６０重量％以上
含んでいるため、温度に対する粘度の変化は緩やかであ
る。そのためＢＫタイプの光学ガラスは、ＪＩＳ−Ｒ３
１０４に規定されている軟化点（粘度が１０7.65ポイズ
の時の温度である。通常は管状電気炉中で直径０．０５
５〜０．０７５cm、長さ２３．５cmの均一なガラス棒の
上部１０cmが毎分約５℃の温度上昇速度で加熱された
時、自重によって毎分０．１cmの速度で伸びる温度であ
る）が７０４〜７２０℃の範囲にある。一般的には精密
プレス成形される光学ガラスの粘度は軟化点の粘度より
やや大きい１０8 〜１０9 ポイズの範囲にあり、そのた
めＢＫタイプのガラスの精密プレス成形温度は、７００
℃付近、すなわち屈伏温度（粘度が１０13ポイズに相当
する）より８０〜１３０℃高温でないと精密プレス成形
を行なうことができない。通常、量産時における精密プ
レス成形温度は６００℃以下、望ましくは５８０℃以下
である。これ以上の高温になると型材の酸化等の問題が
起こり、面精度の確保が難しく量産には適さない。However, since the BK type optical glass generally contains 60% by weight or more of SiO 2 , the viscosity changes slowly with temperature. Therefore, BK type optical glass is JIS-R3
Softening point specified at 104 (temperature at a viscosity of 107.65 poise; usually 0.05 mm in diameter in a tubular electric furnace)
When the upper 10 cm of a uniform glass rod of 5 to 0.075 cm and length of 23.5 cm is heated at a temperature rising rate of about 5 ° C. per minute, the weight of the glass rod elongates at a rate of 0.1 cm per minute by its own weight.) Is in the range of 704 to 720 ° C. Generally, the viscosity of optical glass to be precision press-molded is in the range of 10 8 to 10 9 poise, which is slightly larger than the viscosity at the softening point. Therefore, the precision press molding temperature of BK type glass is 700
Precise press molding cannot be performed unless the temperature is around 80 ° C, that is, 80 to 130 ° C higher than the sagging temperature (viscosity is equivalent to 10 13 poise). Usually, the precision press molding temperature at the time of mass production is 600 ° C. or less, preferably 580 ° C. or less. If the temperature is higher than this, problems such as oxidation of the mold material occur, and it is difficult to secure the surface accuracy, which is not suitable for mass production.
【０００４】また、従来のＢＫタイプの光学ガラスの中
には、光学恒数の調整として微量ではあるが酸化鉛を使
用していることがある。酸化鉛を使用すると型材の酸化
を防ぐために、通常還元性雰囲気で行なわれている精密
プレス成形では、その雰囲気によりガラス表面に存在す
る微量な酸化鉛が還元され、プレスレンズ表面に析出
し、プレスするための加熱により蒸発しプレスレンズ表
面に凹部を形成し、蒸発した鉛が型材の表面に付着し凸
部を形成することにより微小な凹凸が生じプレス成形さ
れたレンズの面精度が維持できないため、設計通りの光
学性能を得ることができないばかりでなく、型材に付着
した鉛を取り除く作業が必要となり量産化するには不適
当であった。したがって本発明の目的は、温度に対する
粘性の変化をできるだけ大きくして、屈伏温度（Ａｔ）
が５６０℃以下で、しかも屈伏温度より３０〜５０℃高
い温度すなわち６００℃以下で精密プレス成形され、さ
らに酸化鉛も含まず、屈折率１．５１〜１．５４、アッ
ベ数（νｄ）６２〜６５．５の光学恒数を有し、精密プ
レス成形に最適である光学ガラスを提供することにあ
る。[0004] Some conventional BK type optical glasses use a small amount of lead oxide to adjust the optical constant. When using lead oxide, in order to prevent oxidation of the mold material, in precision press molding usually performed in a reducing atmosphere, a trace amount of lead oxide present on the glass surface is reduced by the atmosphere and precipitates on the pressed lens surface, To form concave portions on the surface of the press lens and evaporate lead adheres to the surface of the mold material to form convex portions, resulting in minute irregularities, which makes it impossible to maintain the surface accuracy of the pressed lens. In addition, the optical performance as designed cannot be obtained, and it is necessary to remove lead adhering to the mold material, which is not suitable for mass production. Therefore, an object of the present invention is to make the change in viscosity with respect to temperature as large as possible so that the yield temperature (At)
Is precision press-molded at 560 ° C. or lower and at a temperature 30 to 50 ° C. higher than the yielding temperature, that is, at 600 ° C. or lower, further contains no lead oxide, has a refractive index of 1.51 to 1.54, and has an Abbe number (νd) of 62 to An object of the present invention is to provide an optical glass having an optical constant of 65.5 and being optimal for precision press molding.
【０００５】[0005]
【課題を解決するための手段】本発明者等は鋭意研究の
結果、ＳｉＯ2 、Ｂ2 Ｏ3 、Ｌｉ2 ＯおよびＡｌ2 Ｏ 3
が特定の組成範囲にある光学ガラスが、所期の目的を達
成することを見出したものである。すなわち、本発明は
ＳｉＯ2 ３９〜６５重量％、Ｂ2 Ｏ3 １０〜３８重量
％、Ｌｉ2 Ｏ３〜１２重量％、Ｎａ2 Ｏ０〜７重量％、
Ｋ2 Ｏ０〜６．５重量％、且つＬｉ2 Ｏ、Ｎａ2 Ｏおよ
びＫ2 Ｏの合計量が９〜１８重量％、Ａｌ2 Ｏ3 ５〜１
５重量％、ＭｇＯ０〜６重量％、ＣａＯ０〜６重量％、
ＢａＯ０〜６重量％の組成からなり、屈伏温度（Ａｔ）
が５６０℃以下、屈折率（ｎｄ）が１．５１〜１．５
４、アッベ数（νｄ）が６２〜６５．５である、低軟化
点で低屈折率低分散の精密プレス成形用光学ガラスを提
供する。Means for Solving the Problems The present inventors have conducted intensive research.
As a result, SiOTwo, BTwoOThree, LiTwoO and AlTwoO Three
In a specific composition range achieves its intended purpose
It has been found that That is, the present invention
SiOTwo39-65% by weight, BTwoOThree10-38 weight
%, LiTwoO3-12% by weight, NaTwoO0-7% by weight,
KTwoO0-6.5% by weight and LiTwoO, NaTwoO and
And KTwoThe total amount of O is 9 to 18% by weight, AlTwoOThree5-1
5% by weight, MgO 0-6% by weight, CaO 0-6% by weight,
It consists of a composition of BaO0-6% by weight, and has a yield temperature (At)
Is 560 ° C. or less, and the refractive index (nd) is 1.51 to 1.5
4. Low softening with Abbe number (νd) of 62 to 65.5
Optical glass for precision press molding with low refractive index and low dispersion.
Offer.
【０００６】本発明の光学ガラスの各成分範囲を上記の
ように限定した理由は次のとおりである。ＳｉＯ2 は、
本発明の必須配合成分であり、ガラスの網目を構成する
主成分であるが、３９重量％未満では屈折率が高くなり
すぎ、６５重量％を越えると屈服温度（Ａｔ）の上昇を
招き精密プレス成形用光学ガラスとして適さなくなるば
かりでなく、未溶解物を発生させる。The reasons for limiting the range of each component of the optical glass of the present invention as described above are as follows. SiO 2
Although it is an essential component of the present invention and is a main component constituting a glass network, if it is less than 39% by weight, the refractive index becomes too high, and if it exceeds 65% by weight, the yield temperature (At) is increased, and precision press is performed. Not only is it not suitable as an optical glass for molding, but also undissolved matter is generated.
【０００７】Ｂ2 Ｏ3 は、本発明の必須配合成分であ
り、ＳｉＯ2 と同様にガラスの網目を構成する成分であ
り、適量の導入はガラスの溶融性を改善し、ＳｉＯ2 の
配合量を減少させることができる。しかしながら、１０
重量％より少ないと屈伏温度（Ａｔ）の上昇を招き、３
８重量％を越えると化学的耐久性が悪くなるのでＢ2 Ｏ
3 は１０重量％〜３８重量％に限定される。[0007] BTwoOThreeIs an essential component of the present invention.
, SiOTwoIs a component that constitutes the glass network
The introduction of an appropriate amount improves the melting property of the glass,Twoof
The blending amount can be reduced. However, 10
If the content is less than 10% by weight, the yield temperature (At) increases, and 3%.
If the content exceeds 8% by weight, the chemical durability deteriorates.TwoO
ThreeIs limited to 10% to 38% by weight.
【０００８】Ｌｉ2 Ｏは、本発明の必須配合成分であ
り、屈伏温度（Ａｔ）を下げ、粘性の変化を急激にする
重要な作用を有するが、１２重量％より多いと屈折率
（ｎｄ）が高くなりすぎると共に化学的な耐久性が劣化
し、３重量％より少ないと屈伏温度（Ａｔ）下げる効果
が少なくなる。Ｎａ2 Ｏは、本発明の任意配合成分であ
り適量の使用により精密プレス成形時の温度を下げる効
果が得られるが、７重量％を越えると屈折率が上がりす
ぎると共に化学的な耐久性が劣化するので所定範囲内と
する。Ｋ2 Ｏは、本発明の任意配合成分であり、溶融性
の改善およびガラスの安定化に寄与するが、６．５重量
％を越えるとガラスの化学的な耐久性が悪くなり、屈折
率が高くなりすぎてしまうので所定の範囲内とする。且
つＬｉ2 Ｏ、Ｎａ2 ＯおよびＫ2 Ｏの合計量が、９重量
％より少ないと屈伏温度（Ａｔ）が高くなり、精密プレ
ス用素材として適さなくなり、１８重量％より多いと、
屈折率（ｎｄ）が高くなりすぎ、ガラスの化学的耐久性
も悪くなるので、これらの合計量は所定の範囲内とす
る。[0008] Li 2 O is an essential component of the present invention, and has an important effect of lowering the yield temperature (At) and sharply changing the viscosity, but if it exceeds 12% by weight, the refractive index (nd) Is too high, and the chemical durability is deteriorated. If it is less than 3% by weight, the effect of lowering the yield temperature (At) is reduced. Na 2 O is an optional component of the present invention, and when used in an appropriate amount, the effect of lowering the temperature during precision press molding can be obtained. However, if it exceeds 7% by weight, the refractive index becomes too high and the chemical durability deteriorates. Therefore, it is within a predetermined range. K 2 O is an optional component of the present invention and contributes to improvement of melting property and stabilization of glass. However, if it exceeds 6.5% by weight, chemical durability of glass deteriorates, and the refractive index increases. Since it becomes too high, it is set within a predetermined range. If the total amount of Li 2 O, Na 2 O, and K 2 O is less than 9% by weight, the yield temperature (At) becomes high, and the material becomes unsuitable as a precision press material. If it exceeds 18% by weight,
Since the refractive index (nd) becomes too high and the chemical durability of the glass also deteriorates, the total amount of these elements is set within a predetermined range.
【０００９】Ａｌ2 Ｏ3 は、本発明の必須配合成分であ
り、ガラスの化学的な耐久性を上げ、分相傾向を抑止す
る効果を有するが、１５重量％より多いと屈伏温度（Ａ
ｔ）の上昇をまねき、５重量％より少ないとガラスの化
学的な耐久性が劣化する。[0009] Al 2 O 3 is an essential component of the present invention and has the effect of increasing the chemical durability of the glass and suppressing the tendency of phase separation.
If t) is less than 5% by weight, the chemical durability of the glass deteriorates.
【００１０】ＭｇＯは、本発明の任意配合成分である
が、適量の使用はガラスの分相傾向を抑止し、化学的な
耐久性を良くするので使用することが望ましいが、６重
量％を越えると屈伏温度の上昇を招く。ＣａＯおよびＢ
ａＯは、本発明の任意配合成分であり、屈折率を高める
効果を持つが、屈伏温度までをも高めるのでそれぞれ６
重量％以下とする。Although MgO is an optional component of the present invention, it is desirable to use MgO in an appropriate amount because it suppresses the phase separation tendency of the glass and improves the chemical durability, but exceeds 6% by weight. And the yield temperature rises. CaO and B
aO is an optional component of the present invention, and has the effect of increasing the refractive index, but also increases the sagging temperature.
% By weight or less.
【００１１】なお、本発明の光学ガラスには、上記成分
の外に、光学恒数の調整、溶融性の改善、ガラスの安定
性拡大、化学的耐久性の改善などのために、本発明の目
的を外れない限り、Ｐ2 Ｏ5 、ＺｒＯ2 、ＳｒＯ、Ｚｎ
Ｏ、Ｌｎ2 Ｏ3 （Ｌｎ＝Ｌａ、Ｙ、Ｙｂ、Ｇｄ）、Ｆ、
Ｔａ2 Ｏ5 、Ｎｂ2 Ｏ5 、ＴｉＯ2 などを含有させるこ
とができる。The optical glass of the present invention contains, in addition to the above components, adjustment of optical constants, improvement of meltability, expansion of glass stability, improvement of chemical durability, and the like. P 2 O 5 , ZrO 2 , SrO, Zn
O, Ln 2 O 3 (Ln = La, Y, Yb, Gd), F,
Ta 2 O 5 , Nb 2 O 5 , TiO 2 and the like can be contained.
【００１２】本発明の光学ガラスは各成分の原料とし
て、各々相当する酸化物、水酸化物、炭酸塩および硝酸
塩等を使用し、ガラス化した後に所望の組成の割合とな
るように秤量し、十分混合した後、白金ルツボに投入し
て電気炉で１１５０〜１３５０℃で溶融し、攪拌して均
質化を図り、清澄してから適当な温度に予熱した金型内
に鋳込んだ後、徐冷して製造する。なお、脱泡のために
少量のＡｓ2 Ｏ3 などを加えることができる。The optical glass of the present invention uses the corresponding oxides, hydroxides, carbonates, nitrates and the like as the raw materials of the respective components, and weighs them to have a desired composition after vitrification. After mixing well, put into a platinum crucible, melt in an electric furnace at 1150-1350 ° C, stir to homogenize, clarify, cast into a mold preheated to an appropriate temperature, and gradually Cool and manufacture. A small amount of As 2 O 3 or the like can be added for defoaming.
【００１３】[0013]
【実施例】以下実施例を挙げて本発明の光学ガラスを具
体的に説明するが、本発明はこれに限定されるものでは
ない。 （実施例１〜１１）本発明の光学ガラスの実施例の成分
組成（重量％）およびその特性値としての屈折率（ｎ
ｄ）、アッベ数（νｄ）、屈伏温度（Ａｔ）を表１に示
す。本発明の光学ガラスは各成分の原料として、各々相
当する酸化物、水酸化物、炭酸塩および硝酸塩等を使用
し、ガラス化した後に表１の各実施例組成の割合となる
ように秤量し、十分混合した後、白金ルツボに投入して
電気炉で１１５０〜１３５０℃で溶融し、攪拌して均質
化を図り、清澄してから適当な温度に予熱した金型内に
鋳込んだ後、徐冷して製造した。なお、脱泡のために少
量のＡｓ2 Ｏ 3 などを加えても良い。EXAMPLES The optical glass of the present invention will be described in the following examples.
Although explained concretely, the present invention is not limited to this.
Absent. (Examples 1 to 11) Components of Examples of Optical Glass of the Invention
Composition (% by weight) and refractive index (n
d), Abbe number (νd) and yield temperature (At) are shown in Table 1.
You. The optical glass of the present invention can be used as a raw material for each component.
Use appropriate oxides, hydroxides, carbonates and nitrates
And after vitrification, the ratio of the composition of each example in Table 1 is obtained.
After weighing and mixing well, put into a platinum crucible
Melt at 1150-1350 ° C in an electric furnace, stir and homogenize
In a mold that has been preheated to an appropriate temperature
After casting, it was produced by slow cooling. Note that a small amount
Quantity of AsTwoO ThreeEtc. may be added.
【００１４】次に得られたガラスから、所定重量のガラ
ス塊を切出し、従来の研磨法により球状に研磨し、これ
をプリフォームとして５５０〜６００℃で精密プレスを
行なうことにより１１種類の製品を得た。これらのプレ
スレンズの形状を測定した結果、いずれも１．０ミクロ
ン以下の形状誤差を示し、良好な転写性を示すと共に、
型材へのガラス付着、揮発物の付着などは認められなか
った。Next, a predetermined mass of glass ingot is cut out of the obtained glass, polished into a spherical shape by a conventional polishing method, and the resulting preform is precision pressed at 550 to 600 ° C. to obtain 11 types of products. Obtained. As a result of measuring the shape of these press lenses, all show a shape error of 1.0 micron or less, and show good transferability,
Adhesion of glass, volatile matter, etc. to the mold was not observed.
【００１５】実施例４に示される組成から溶融されたガ
ラスについてＪＩＳ−Ｒ３１０４に規定されている軟化
点を測定した。その結果６０９℃であり、通常ＢＫタイ
プと呼ばれる光学ガラスと比較して１００℃以上の低下
が認められた。実施例５に示される組成から溶融された
ガラスについて、日本光学硝子工業会規格に規定されて
いる光学ガラスの化学的耐久性の測定方法（粉末法）
（ＪＯＧＩＳ０６−1975）で耐水性を測定した結果、
０．０３ｗｔ．％（ただし減量率）であり、ＢＫタイプ
と同等の化学的耐久性が確認された。The softening point specified in JIS-R3104 was measured for glass melted from the composition shown in Example 4. As a result, the temperature was 609 ° C., and a decrease of 100 ° C. or more was recognized as compared with the optical glass usually called a BK type. For a glass melted from the composition shown in Example 5, a method for measuring the chemical durability of an optical glass specified by the Japan Optical Glass Industrial Standards (powder method)
(JOGIS06- 1975) the results of the measurement of the water resistance,
0.03 wt. % (However, the weight loss rate), and the same chemical durability as the BK type was confirmed.
【００１６】（比較例１）従来公知の光学ガラスで通常
ＢＫ７と呼ばれるガラスの組成を比較例１として作製し
た。この組成を用いて実施例１〜１１と同様にガラスを
製造し、プリフォームを作製し、精密プレスを行なっ
た。その結果、精密プレス成形温度が７００℃以上にな
り、型材の劣化が著しく、型の連続的な使用は不可能で
あった。実施例と同様にＪＩＳ−Ｒ３１０４に規定され
ている軟化点を測定した。その結果７２３℃であった。
配合組成と特性値は表１に示す。Comparative Example 1 A composition of a conventionally known optical glass usually called BK7 was produced as Comparative Example 1. Glass was produced using this composition in the same manner as in Examples 1 to 11, a preform was produced, and precision pressing was performed. As a result, the precision press molding temperature was 700 ° C. or higher, the mold material was significantly deteriorated, and continuous use of the mold was impossible. The softening point specified in JIS-R3104 was measured in the same manner as in the examples. As a result, it was 723 ° C.
Table 1 shows the composition and characteristic values.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【表３】 [Table 3]
【００２０】[0020]
【表４】 [Table 4]
【００２１】[0021]
【発明の効果】本発明によれば従来の光学ガラス（ＢＫ
タイプ）と比較しても、精密プレス成形温度は１００℃
以上の低下が認められ、型材への悪影響もなく、成形型
の寿命を著しく向上させることができ、安定して精密プ
レス成形を行なうことができる。また、従来の光学ガラ
スとしてももちろん使用できるので産業上極めて有用で
ある。According to the present invention, the conventional optical glass (BK
Precision press molding temperature is 100 ℃
The above reduction is observed, and there is no adverse effect on the mold material, the life of the molding die can be significantly improved, and precision press molding can be stably performed. In addition, since it can be used as a conventional optical glass, it is industrially extremely useful.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C03C 3/064 C03C 3/087 C03C 3/091 C03C 4/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C03C 3/064 C03C 3/087 C03C 3/091 C03C 4/00
Claims (1)
〜３８重量％、Ｌｉ 2 Ｏ３〜１２重量％、Ｎａ2 Ｏ０〜
７重量％、Ｋ2 Ｏ０〜６．５重量％、且つＬｉ2 Ｏ、Ｎ
ａ2 ＯおよびＫ2 Ｏの合計量が９〜１８重量％、Ａｌ2
Ｏ3 ５〜１５重量％、ＭｇＯ０〜６重量％、ＣａＯ０〜
６重量％、ＢａＯ０〜６重量％の組成からなり、屈伏温
度（Ａｔ）が５６０℃以下、屈折率（ｎｄ）が１．５１
〜１．５４、アッベ数（νｄ）が６２〜６５．５であ
る、低軟化点で低屈折率低分散の精密プレス成形用光学
ガラス。(1) SiOTwo39-65% by weight, BTwoOThree10
~ 38% by weight, Li TwoO3-12% by weight, NaTwoO0
7% by weight, KTwoO0-6.5% by weight and LiTwoO, N
aTwoO and KTwoThe total amount of O is 9 to 18% by weight, AlTwo
OThree5-15% by weight, MgO0-6% by weight, CaO0-0
6% by weight, BaO 0-6% by weight, yield temperature
The degree (At) is 560 ° C. or less, and the refractive index (nd) is 1.51.
~ 1.54, Abbe number (νd) is 62 ~ 65.5
Optics for precision press molding with low softening point and low refractive index and low dispersion
Glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04010039A JP3100726B2 (en) | 1992-01-23 | 1992-01-23 | Optical glass for precision press molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04010039A JP3100726B2 (en) | 1992-01-23 | 1992-01-23 | Optical glass for precision press molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05193979A JPH05193979A (en) | 1993-08-03 |
| JP3100726B2 true JP3100726B2 (en) | 2000-10-23 |
Family
ID=11739257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04010039A Expired - Lifetime JP3100726B2 (en) | 1992-01-23 | 1992-01-23 | Optical glass for precision press molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3100726B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3555681B2 (en) * | 2001-10-29 | 2004-08-18 | 日本電気硝子株式会社 | Glass for mold press molding |
| JP4143840B2 (en) | 2003-09-17 | 2008-09-03 | 五鈴精工硝子株式会社 | Glass for press molding |
| JP4453328B2 (en) * | 2003-10-09 | 2010-04-21 | 日本電気硝子株式会社 | Mold press molding glass and method for producing the same |
| JP5961206B2 (en) * | 2014-03-14 | 2016-08-02 | 株式会社住田光学ガラス | Optical glass, precision press-molding preform, and optical element |
| JP6792806B2 (en) * | 2015-04-10 | 2020-12-02 | 日本電気硝子株式会社 | Glass plate |
| JP7398185B2 (en) * | 2017-01-25 | 2023-12-14 | 日本電気硝子株式会社 | optical glass lens |
| WO2018139167A1 (en) * | 2017-01-25 | 2018-08-02 | 日本電気硝子株式会社 | Optical glass lens |
| WO2018155105A1 (en) * | 2017-02-24 | 2018-08-30 | 日本電気硝子株式会社 | Optical glass |
| JP7134396B2 (en) * | 2017-02-24 | 2022-09-12 | 日本電気硝子株式会社 | optical glass |
| JP2019135201A (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 |
| JP7132589B2 (en) * | 2018-03-02 | 2022-09-07 | 株式会社住田光学ガラス | Optical glass, preforms for precision press molding, and optical elements |
| CN112047625B (en) * | 2020-09-17 | 2022-04-15 | 成都光明光电股份有限公司 | Ultraviolet-transmitting optical glass |
-
1992
- 1992-01-23 JP JP04010039A patent/JP3100726B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05193979A (en) | 1993-08-03 |
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