JPH04224132A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JPH04224132A JPH04224132A JP41455890A JP41455890A JPH04224132A JP H04224132 A JPH04224132 A JP H04224132A JP 41455890 A JP41455890 A JP 41455890A JP 41455890 A JP41455890 A JP 41455890A JP H04224132 A JPH04224132 A JP H04224132A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- linear expansion
- optical
- weather resistance
- refractive index
- 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.)
- Pending
Links
- 239000005304 optical glass Substances 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 27
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 7
- 239000010935 stainless steel Substances 0.000 abstract description 7
- 238000007789 sealing Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- 239000003513 alkali Substances 0.000 description 10
- 238000010828 elution Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 4
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004031 devitrification Methods 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
Landscapes
- Glass Compositions (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、レンズ等に用いられる
光学用ガラスに関し、特にステンレス金属からなるホル
ダーを有する光学部品のレンズとして好適な光学用ガラ
スに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical glass used for lenses and the like, and more particularly to an optical glass suitable as a lens for an optical component having a holder made of stainless steel.
【０００２】0002
【従来の技術】近年、高速かつ大容量の通信をおこなう
ために光通信が広く実施されるようになってきている。
光通信では、レーザーダイオードからの光信号を光ファ
イバーで伝送し、光受信器により電気信号に変換して情
報を伝達する。レーザーダイオードから出た光信号を効
率良く光ファイバーに結合するために、あるいは光ファ
イバーで伝送された光信号を効率良く光受信器に結合す
るために、所定の形状のガラス成形体を加工することに
よって作製された球レンズあるいはドラムレンズが用い
られる。これらのレンズは、光軸をレーザーダイオード
、光ファイバーおよび光受信器に合わせるために、金属
ホルダーに固定される。ホルダーに用いられる金属とし
ては、めっき処理が不要でかつ溶接が容易であることか
ら、主にＳＵＳ ４０３やＳＵＳ ４３０等のステ
ンレス金属が使用され、ガラスレンズと金属ホルダーは
、ガラスフリットにより固定される。2. Description of the Related Art In recent years, optical communications have come into widespread use for high-speed, large-capacity communications. In optical communication, an optical signal from a laser diode is transmitted through an optical fiber, and an optical receiver converts it into an electrical signal to transmit information. Manufactured by processing a glass molded body in a predetermined shape in order to efficiently couple the optical signal emitted from a laser diode to an optical fiber, or to efficiently couple the optical signal transmitted by an optical fiber to an optical receiver. A rounded ball lens or drum lens is used. These lenses are fixed in a metal holder to align the optical axis with the laser diode, optical fiber and optical receiver. The metal used for the holder is mainly stainless steel such as SUS 403 and SUS 430, as it does not require plating and is easy to weld.The glass lens and metal holder are fixed with glass frit. .
【０００３】ところで、従来よりこのような光通信用の
ガラスレンズとしては、これに要求される屈折率、すな
わち波長５８７．６ｎｍにおいて１．５００〜１．５３
０の屈折率を有することから、主にＢＫ７と呼ばれる光
学用ガラスが使用されてきた。しかし、ＢＫ７は、 ３
０〜３８０℃の温度範囲の線膨張係数が８０〜９０×１
０ −７ ／℃と比較的小さいため、１００〜１３５×
１０−７／℃の線膨張係数を有しているステンレス金属
ホルダーと封着すると、線膨張係数の相違のため、ガラ
ス内部に大きな応力が発生する。この応力は、レンズの
光学特性に悪影響を与えるだけでなくレンズの破損をも
引き起こす。By the way, conventionally, such glass lenses for optical communications have a refractive index required for them, that is, 1.500 to 1.53 at a wavelength of 587.6 nm.
Optical glass called BK7 has been mainly used because it has a refractive index of 0. However, BK7 is 3
Linear expansion coefficient in the temperature range of 0 to 380°C is 80 to 90 x 1
Since it is relatively small at 0-7/℃, it is 100 to 135×
When the glass is sealed with a stainless metal holder having a linear expansion coefficient of 10-7/°C, a large stress is generated inside the glass due to the difference in linear expansion coefficient. This stress not only adversely affects the optical properties of the lens but also causes damage to the lens.
【０００４】そこで、線膨張係数が９５×１０−７／℃
以上で、ステンレス金属のそれに近似し、且つ、屈折率
が１．５００から１．５３０という良好な特性を有する
光学用ガラス、例えばＫ３やＫ７と呼ばれるガラスを、
この種のレンズに使用することが試みられている。[0004] Therefore, the coefficient of linear expansion is 95×10-7/°C.
As described above, optical glass, such as glass called K3 or K7, which is similar to that of stainless steel metal and has good properties with a refractive index of 1.500 to 1.530, is
Attempts have been made to use this type of lens.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、これら
の光学用ガラスは、いずれも耐候性が著しく悪く、ヤケ
によるレンズ表面の劣化が生じやすいという欠点を有し
ている。レンズ表面の劣化は、光信号の結合効率の低下
につながるために、耐候性の悪いガラスは、光通信用の
レンズとしては使用できない。However, all of these optical glasses have the disadvantage that they have extremely poor weather resistance and are susceptible to lens surface deterioration due to fading. Glass with poor weather resistance cannot be used as a lens for optical communication because deterioration of the lens surface leads to a decrease in the coupling efficiency of optical signals.
【０００６】本発明は、ステンレス金属との封着による
内部応力の発生が小さくなるように、９５〜１３０×１
０−７／℃の線膨張係数を有し、屈折率が波長５８７．
６ｎｍにおいて、１．５００から１．５３０の範囲に有
り、しかも優れた耐候性を有する光学用ガラスを提供す
ることを目的とするものである。[0006] The present invention is designed to reduce internal stress caused by sealing with stainless steel metal.
It has a linear expansion coefficient of 0-7/℃ and a refractive index of 587.
The object of the present invention is to provide an optical glass having a particle diameter of 1.500 to 1.530 at 6 nm and excellent weather resistance.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、アルカリ
珪酸塩ガラスを基本とし、アルカリ金属酸化物の含有量
により線膨張係数、屈折率を所定の値に設定した上で、
Ａｌ２ Ｏ３ およびアルカリ土類金属酸化物を適量含
有させることで、良好な耐候性が得られることを見い出
し、本発明として提案するものである。[Means for Solving the Problems] The present inventors set the linear expansion coefficient and refractive index to predetermined values based on the content of alkali metal oxide based on alkali silicate glass, and then
It has been discovered that good weather resistance can be obtained by containing appropriate amounts of Al2O3 and alkaline earth metal oxides, and this is proposed as the present invention.
【０００８】すなわち本発明の光学用ガラスは、重量百
分率で、ＳｉＯ２ ５０．０ 〜７０．０％、 Ａｌ
２ Ｏ３ １．５〜１０．０％、 Ｂ２ Ｏ３
０．１〜１．９％、 Ｒ２ Ｏ １６．０ 〜２８
．０％（ ただしＲは、Ｌｉ、Ｎａ、Ｋを表す）、Ｒ’
Ｏ２．０〜１５．０％（ ただしＲ’ は、Ｍｇ、Ｃ
ａ、Ｓｒ、Ｂａ、Ｚｎを表す）、ＺｒＯ２ ０〜１．
５％からなり、３０〜３８０℃の温度範囲の線膨張係数
が９５〜１３０×１０−７／℃、波長５８７．６ｎｍに
おける屈折率が１．５００〜１．５３０であり、優れた
耐候性を有することを特徴とする。That is, the optical glass of the present invention contains SiO2 50.0 to 70.0%, Al
2 O3 1.5-10.0%, B2 O3
0.1-1.9%, R2O 16.0-28
．． 0% (R represents Li, Na, K), R'
O2.0-15.0% (where R' is Mg, C
a, Sr, Ba, Zn), ZrO2 0-1.
It has a linear expansion coefficient of 95 to 130 x 10-7/℃ in the temperature range of 30 to 380℃, a refractive index of 1.500 to 1.530 at a wavelength of 587.6 nm, and has excellent weather resistance. It is characterized by having.
【０００９】また本発明の光学用ガラスは、より好まし
くは、重量百分率で、ＳｉＯ２ ５５．０〜７０．０％
、 Ａｌ２Ｏ３ ２．０ 〜６．５％、 Ｂ２ Ｏ３
０．２〜１．８％、 Ｒ２ Ｏ １８．０〜２
５．０％（ただしＲは、Ｌｉ、Ｎａ、Ｋを表す）、Ｍｇ
Ｏ＋ＣａＯ＋ＳｒＯ＋ＺｎＯ ８．０〜１２．０％、
ＺｒＯ２ ０〜１．５％からなることを特徴とする
。[0009] The optical glass of the present invention more preferably contains 55.0 to 70.0% SiO2 in weight percentage.
, Al2O3 2.0-6.5%, B2O3
0.2-1.8%, R2O 18.0-2
5.0% (R represents Li, Na, K), Mg
O+CaO+SrO+ZnO 8.0-12.0%,
It is characterized by consisting of ZrO2 0-1.5%.
【００１０】0010
【作用】本発明の光学用ガラスの各成分を上記のように
限定した理由は以下のとおりである。[Operation] The reason why each component of the optical glass of the present invention is limited as described above is as follows.
【００１１】ＳｉＯ２ は、ガラスの骨格を構成する成
分であるが、７０．０％より多いと、線膨張係数が低く
なりすぎると共に溶融性が悪化し、５０．０％より少な
いと、耐候性が悪くなる。[0011] SiO2 is a component constituting the skeleton of glass; if it exceeds 70.0%, the coefficient of linear expansion becomes too low and the meltability deteriorates; if it is less than 50.0%, the weather resistance deteriorates. Deteriorate.
【００１２】Ａｌ２ Ｏ３ は、ガラスの耐候性を向上
するのに著しい効果があるが、１０．０％を越えるとガ
ラスが著しく溶けにくくなり、１．５％より少ないと、
上記の効果が得られない。[0012]Al2O3 has a remarkable effect on improving the weather resistance of glass, but when it exceeds 10.0%, the glass becomes extremely difficult to melt, and when it is less than 1.5%,
The above effect cannot be obtained.
【００１３】Ｂ２ Ｏ３ は、融剤として作用し、ガラ
スの溶融を助ける効果があるが、１．９％より多いと、
ガラスの屈折率が１．５００以下となりやすく、０．１
％より少ないと、上記の効果が得られない。[0013] B2 O3 acts as a fluxing agent and has the effect of helping the melting of glass, but if it exceeds 1.9%,
The refractive index of glass tends to be 1.500 or less, and 0.1
%, the above effects cannot be obtained.
【００１４】アルカリ金属酸化物Ｒ２ Ｏは、ガラスの
溶融を促進する成分であるが、１６．０％より少ないと
、線膨張係数が小さくなりすぎ、２８．０％より多いと
、線膨張係数が大きくなりすぎるとともに耐候性が悪化
し、且つ、屈折率が１．５３０以上になりやすい。Ｒ２
Ｏは、線膨張係数に大きく影響し、線膨張係数を所定
の値に設定するためには、その含有量を厳密に規制する
ことが必要である。またＬｉ２ Ｏ、 Ｎａ２ Ｏ、
Ｋ２ Ｏの少なくとも２種類以上用いることで混合アル
カリ効果による優れた耐候性を得ることが可能である。Alkali metal oxide R2O is a component that promotes melting of glass, but if it is less than 16.0%, the coefficient of linear expansion becomes too small, and if it is more than 28.0%, the coefficient of linear expansion becomes too small. As it becomes too large, weather resistance deteriorates and the refractive index tends to be 1.530 or more. R2
O has a large effect on the coefficient of linear expansion, and in order to set the coefficient of linear expansion to a predetermined value, it is necessary to strictly control its content. Also, Li2O, Na2O,
By using at least two or more types of K2O, it is possible to obtain excellent weather resistance due to the mixed alkali effect.
【００１５】アルカリ土類金属酸化物Ｒ’ Ｏ（ＭｇＯ
、ＣａＯ、ＳｒＯ、ＢａＯおよびＺｎＯ） は、ガラス
の耐候性を向上させる効果を有するが、１５．０％より
多いと、ガラスの失透性が増し、均質なガラスの製造が
困難になり、７．０％より少ないと、上記効果が得られ
ない。耐候性向上の効果は、ＭｇＯ、ＣａＯ、ＳｒＯお
よびＺｎＯが顕著であり、その合量が８．０〜１２．０
％であることがより好ましい。Alkaline earth metal oxide R'O (MgO
, CaO, SrO, BaO and ZnO) have the effect of improving the weather resistance of glass, but if it exceeds 15.0%, the devitrification of the glass increases, making it difficult to manufacture homogeneous glass, If it is less than .0%, the above effects cannot be obtained. The effect of improving weather resistance is remarkable for MgO, CaO, SrO, and ZnO, and their total content is 8.0 to 12.0.
% is more preferable.
【００１６】ＺｒＯ２ は、耐候性を向上させる効果を
有するが、１．５％より多いと、溶融時のガラス粘度を
増大させ、溶融を困難にする。ZrO2 has the effect of improving weather resistance, but if it exceeds 1.5%, it increases the viscosity of the glass during melting, making melting difficult.
【００１７】尚、本発明において、ＰｂＯおよびＦ２
を含有すると、ガラス溶融時に融液から蒸発し環境汚染
の原因になるので、実質的に含有しないことが好ましい
。[0017] In the present invention, PbO and F2
If it is contained, it will evaporate from the melt during glass melting and cause environmental pollution, so it is preferable that it is not substantially contained.
【００１８】[0018]
【実施例】次に、本発明を実施例に基づいて詳細に説明
する。EXAMPLES Next, the present invention will be explained in detail based on examples.
【００１９】次表は、本発明の光学用ガラスの実施例お
よび比較例の組成と特性を示すものである。The following table shows the composition and properties of the optical glasses of the present invention and comparative examples.
【００２０】[0020]
【表１】[Table 1]
【００２１】表に示したＮｏ．１〜１０の各試料は、次
のようにして調製した。[0021] No. shown in the table. Each of samples 1 to 10 was prepared as follows.
【００２２】まず表に示す組成になるようにガラス原料
を調合し、白金坩堝を用いて１５００℃で４時間溶融し
た。溶融後、融液をカーボン板上に流し出し、アニール
することによって、ガラス試料を作製し、それらの３０
〜３８０℃の温度範囲における線膨張係数、アルカリ溶
出量及び波長５８７．６ｎｍにおける屈折率を測定して
各特性を表に示した。[0022] First, glass raw materials were prepared to have the composition shown in the table, and melted at 1500°C for 4 hours using a platinum crucible. After melting, glass samples were prepared by pouring the melt onto a carbon plate and annealing.
The linear expansion coefficient, the amount of alkali elution, and the refractive index at a wavelength of 587.6 nm were measured in the temperature range of ~380°C, and the respective properties are shown in the table.
【００２３】表から明らかなように、本発明の実施例で
あるＮｏ．１〜７の各試料は、線膨張係数が、１００．
５〜１１０．３×１０−７／℃であり、ステンレス金属
のそれと近似し、またアルカリ溶出量が０．９５ｍｇ以
下であり、優れた耐候性を有し、さらに屈折率が１．５
１６〜１．５２３と良好な値を示した。As is clear from the table, No. 1, which is an example of the present invention, Each of samples 1 to 7 has a linear expansion coefficient of 100.
5 to 110.3 x 10-7/℃, which is similar to that of stainless steel metal, the amount of alkali elution is 0.95 mg or less, it has excellent weather resistance, and the refractive index is 1.5.
It showed a good value of 16 to 1.523.
【００２４】それに対し、比較例であるＮｏ．８の試料
は、アルカリ溶出量と屈折率は、良好な値を示したが、
アルカリ金属酸化物の含有量が少ないため、線膨張係数
が８５．０×１０−７／℃と小さかった。またＮｏ．９
の試料は、線膨張係数と屈折率は、良好な値を示したが
、Ａｌ２ Ｏ３の含有量が少ないため、アルカリ溶出量
が１．８５ｍｇと多く、耐候性に劣っていた。さらにＮ
ｏ．１０の試料は、線膨張係数とアルカリ溶出量は、比
較的良好な値を示したが、Ｂ２ Ｏ３ の含有量が多い
ため、屈折率が１．４９６と低かった。On the other hand, the comparative example No. Sample No. 8 showed good values for alkali elution amount and refractive index, but
Since the content of alkali metal oxide was low, the coefficient of linear expansion was as small as 85.0 x 10-7/°C. Also No. 9
The sample showed good linear expansion coefficient and refractive index, but because the content of Al2O3 was low, the amount of alkali elution was as large as 1.85 mg, and the weather resistance was poor. Further N
o. Sample No. 10 showed relatively good values for the coefficient of linear expansion and the amount of alkali elution, but the refractive index was as low as 1.496 due to the large content of B2O3.
【００２５】尚、表中の線膨張係数は、自記示差熱膨張
計で、３０〜３８０℃の温度範囲の平均線膨張係数を測
定したものである。アルカリ溶出量は、耐候性を判定す
るために行ったものであり、ＪＩＳ Ｒ３５０２に基
づくアルカリ溶出試験によって測定した。すなわちガラ
ス表面のヤケは、空気中の水分の作用によりガラス中の
アルカリが表面に析出し、炭酸塩や水酸化物などの反応
生成物を形成することによって生じるものであり、アル
カリ溶出試験でアルカリの溶出量が多いガラスほど耐候
性に劣り、逆に溶出量の少ないガラスほど耐候性に優れ
ていると判断される。光通信用のレンズに用いられるガ
ラスは、アルカリ溶出量が１．０ｍｇ以下であるような
耐候性が要求される。また屈折率は、アッベ屈折率計に
よって測定したものである。The linear expansion coefficients in the table are the average linear expansion coefficients measured in the temperature range of 30 to 380° C. using a self-recording differential thermal dilatometer. The amount of alkali elution was performed to determine weather resistance, and was measured by an alkali elution test based on JIS R3502. In other words, the discoloration on the glass surface is caused by the alkali in the glass precipitating on the surface due to the action of moisture in the air, forming reaction products such as carbonates and hydroxides. It is judged that the glass with a larger elution amount is inferior in weather resistance, and conversely, the glass with a smaller elution amount is superior in weather resistance. Glass used in optical communication lenses is required to have weather resistance such that the amount of alkali elution is 1.0 mg or less. Moreover, the refractive index was measured using an Abbe refractometer.
【００２６】[0026]
【発明の効果】以上のように本発明の光学用ガラスは、
ステンレス金属との封止に適した９５〜１３０×１０−
７／℃の線膨張係数を有し、波長５８７．６ｎｍにおけ
る屈折率が１．５００〜１．５３０ｎｍであり、しかも
優れた耐候性を有するため、高い信頼性が要求される光
通信用レンズを始めとして、各種のレンズやプリズムと
して使用可能である。[Effects of the Invention] As described above, the optical glass of the present invention has
95-130×10- suitable for sealing with stainless steel metal
It has a linear expansion coefficient of 7/℃, a refractive index of 1.500 to 1.530 nm at a wavelength of 587.6 nm, and excellent weather resistance, making it suitable for optical communication lenses that require high reliability. First, it can be used as various lenses and prisms.
Claims (2)
０〜７０．０％、 Ａｌ２ Ｏ３ １．５〜１０．
０％、 Ｂ２ Ｏ３ ０．１〜１．９％、 Ｒ２
Ｏ１６．０〜２８．０％（ ただしＲは、Ｌｉ、Ｎａ、
Ｋを表す）、Ｒ’ Ｏ ７．０〜１５．０％（ ただ
しＲ’ は、Ｍｇ、Ｃａ、Ｓｒ、Ｂａ、Ｚｎを表す）、
ＺｒＯ２ ０〜１．５％からなり、３０〜３８０℃
の温度範囲の線膨張係数が９５〜１３０×１０−７／℃
、波長５８７．６ｎｍにおける屈折率が１．５００〜１
．５３０であり、優れた耐候性を有することを特徴とす
る光学用ガラス。Claim 1: SiO2 50.% by weight.
0-70.0%, Al2O3 1.5-10.
0%, B2 O3 0.1-1.9%, R2
O16.0 to 28.0% (where R is Li, Na,
K), R' O 7.0 to 15.0% (where R' represents Mg, Ca, Sr, Ba, Zn),
Consisting of ZrO2 0-1.5%, 30-380℃
The linear expansion coefficient in the temperature range of 95 to 130 x 10-7/℃
, the refractive index at a wavelength of 587.6 nm is 1.500 to 1.
．． 530, and is characterized by having excellent weather resistance.
０〜７０．０％、 Ａｌ２ Ｏ３ ２．０〜６．５
％、 Ｂ２ Ｏ３ ０．２〜１．８％、 Ｒ２ Ｏ
１８．０〜２５．０％（ ただしＲは、Ｌｉ、Ｎａ、Ｋ
を表す）、ＭｇＯ＋ＣａＯ＋ＳｒＯ＋ＺｎＯ ８．０
〜１２．０％、ＺｒＯ２ ０〜１．５％からなり、
３０〜３８０℃の温度範囲の線膨張係数が９５〜１３０
×１０−７／℃、波長５８７．６ｎｍにおける屈折率が
１．５００〜１．５３０であり、優れた耐候性を有する
ことを特徴とする請求項１の光学用ガラス。2. In weight percentage, SiO2 55.
0-70.0%, Al2O3 2.0-6.5
%, B2 O3 0.2-1.8%, R2 O
18.0 to 25.0% (R is Li, Na, K
), MgO+CaO+SrO+ZnO 8.0
~12.0%, ZrO2 0~1.5%,
Linear expansion coefficient in the temperature range of 30 to 380°C is 95 to 130
The optical glass according to claim 1, having a refractive index of 1.500 to 1.530 at x10-7/°C and a wavelength of 587.6 nm, and having excellent weather resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41455890A JPH04224132A (en) | 1990-12-25 | 1990-12-25 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41455890A JPH04224132A (en) | 1990-12-25 | 1990-12-25 | Optical glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04224132A true JPH04224132A (en) | 1992-08-13 |
Family
ID=18523022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41455890A Pending JPH04224132A (en) | 1990-12-25 | 1990-12-25 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04224132A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005104824A (en) * | 2003-09-09 | 2005-04-21 | Ohara Inc | Optical glass with low refractive index |
| CN104140204A (en) * | 2013-05-09 | 2014-11-12 | 成都光明光电股份有限公司 | Optical glass, optical preform and optical element |
-
1990
- 1990-12-25 JP JP41455890A patent/JPH04224132A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005104824A (en) * | 2003-09-09 | 2005-04-21 | Ohara Inc | Optical glass with low refractive index |
| JP4592353B2 (en) * | 2003-09-09 | 2010-12-01 | 株式会社オハラ | Low refractive index optical glass |
| CN104140204A (en) * | 2013-05-09 | 2014-11-12 | 成都光明光电股份有限公司 | Optical glass, optical preform and optical element |
| CN107698142A (en) * | 2013-05-09 | 2018-02-16 | 成都光明光电股份有限公司 | Optical glass, optical precast product and optical element |
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