JP2726310B2 - Optical glass for precision press molding - Google Patents
Optical glass for precision press moldingInfo
- Publication number
- JP2726310B2 JP2726310B2 JP1172775A JP17277589A JP2726310B2 JP 2726310 B2 JP2726310 B2 JP 2726310B2 JP 1172775 A JP1172775 A JP 1172775A JP 17277589 A JP17277589 A JP 17277589A JP 2726310 B2 JP2726310 B2 JP 2726310B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- temperature
- optical glass
- press molding
- chemical durability
- 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
- C03C3/062—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
【発明の詳細な説明】 産業上の利用分野 本発明は、きわめて低温でプレス成形可能な、精密プ
レスレンズ用の光学ガラスに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical glass for a precision press lens that can be press-formed at a very low temperature.
従来の技術 従来同じような光学恒数を持つものとして、中屈折率
低分散タイプ（nd＝1.59以上、νｄ＝54以上）の光学ガ
ラスが存在する。また、プレス成形用のガラスとして、
リン酸塩系ガラス（特開昭55−154343号公報、特開昭58
−79839号公報、特開昭60−122749号公報参照）、フル
オロリン酸塩系ガラス（特開昭56−59641号公報、特開
昭56−149343号公報、特開昭58−217451号公報参照）、
フツホウ酸塩系ガラス（特開昭59−146952号公報参照）
が知られている。2. Description of the Related Art Conventionally, there is an optical glass of a medium refractive index and low dispersion type (nd = 1.59 or more, vd = 54 or more) having the same optical constant. In addition, as glass for press molding,
Phosphate-based glasses (JP-A-55-154343, JP-A-58-154343)
JP-79839, JP-A-60-122747), fluorophosphate-based glass (JP-A-56-59641, JP-A-56-149343, JP-A-58-217451) ),
Fluoroborate-based glass (see JP-A-59-144692)
It has been known.
発明が解決しようとする課題 しかし、従来よりある中屈折率低分散タイプ（nd＝1.
59以上、νｄ＝54以上）の光学ガラスは、屈伏温度（A
t）が630℃もしくはそれ以上のものしか存在せず、その
プレス温度は700℃を超える高い温度でなければ成形す
ることができなかった。精密プレス成形の公知の型材等
では、量産におけるプレス温度の限界が650℃未満、望
ましくは600℃以下であり、それ以上の高温になると型
材の酸化等の問題が起こり、面精度の保持が難しく量産
には適さない。そのため、プレスされるガラスは可能な
限り低い温度で成形できるものが望ましい。これらの問
題を解決するために、上記プレス成形用ガラスの公開公
報では、ガラス形成酸化物として、リン酸及びホウ酸を
選んでいる。しかし、リン酸及びホウ酸は、プレス成形
温度を低くするのには有利であるが、ガラスの化学的耐
久性及び耐候性に問題を生じやすい。さらに、ガラスの
化学的耐久性及び耐候性が低下すると、プレス成形時の
面精度の悪化等につながるばかりでなく、レンズとして
長期間の実用に耐えられなくなる。また、上記公報中に
見られるフッ素の導入は、プレス温度の低下及び低分散
化には有利であるが、ガラス溶融時の揮発が非常に多く
なり、安定して均質なガラスを得ることが難しい。ま
た、環境等にも問題を生じやすい。鉛を含むガラスも上
記特許に見られるが、鉛を含むと、鉛の揮発物が型材に
付着し、面精度の保持等に問題が生じやすい。また、本
発明と同じホウ珪酸塩系ガラス（特開昭62−123040号公
報参照）が知られているが、これらのガラスは上記公報
と同じように、化学的耐久性の点で問題がある。すなわ
ち、これらのガラスは、日本光学硝子工業会規格JOGIS
−06−1975の測定法による化学的耐久性試験を実際に行
なってみると、その耐水性のランクは３以下であり、実
用における長期間の使用には問題が生じる。実際の実用
上の耐水性のランクは２以上が適切である。Problems to be Solved by the Invention However, the conventional medium refractive index low dispersion type (nd = 1.
Optical glass of 59 or more and νd = 54 or more has a yield temperature (A
t) was only 630 ° C. or higher, and the pressing temperature could not be increased unless it was higher than 700 ° C. In the known mold material of precision press molding, the limit of the press temperature in mass production is less than 650 ° C., preferably 600 ° C. or less. Not suitable for mass production. Therefore, it is desirable that the glass to be pressed can be formed at the lowest possible temperature. In order to solve these problems, phosphoric acid and boric acid are selected as glass-forming oxides in the above publication of press forming glass. However, although phosphoric acid and boric acid are advantageous for lowering the press molding temperature, they tend to cause problems in the chemical durability and weather resistance of glass. Further, when the chemical durability and the weather resistance of the glass are reduced, not only the surface accuracy during press molding is deteriorated, but also the lens cannot be used for a long period of time. Further, the introduction of fluorine found in the above publication is advantageous for lowering the press temperature and reducing the dispersion, but volatilization during melting of the glass becomes extremely large, and it is difficult to obtain a stable and homogeneous glass. . In addition, problems are likely to occur in the environment and the like. Glass containing lead is also found in the above patent, but when lead is contained, volatiles of lead adhere to the mold material, and problems such as maintaining surface accuracy are likely to occur. Further, the same borosilicate glass as that of the present invention (see JP-A-62-123040) is known, but these glasses have a problem in terms of chemical durability as in the above-mentioned publication. . In other words, these glasses are based on JOGIS
When actually performing a chemical durability test by the measurement method of -06-1975, the water resistance rank is 3 or less, and there is a problem in long-term use in practical use. An actual practical water resistance rank of 2 or more is appropriate.
従って、本発明の第１の目的は、きわめて低い温度
（600℃以下）で精密プレスを実施することができる、
精密プレス成形用光学ガラスを提供することにある。Therefore, a first object of the present invention is to perform a precision press at an extremely low temperature (600 ° C. or lower).
An object of the present invention is to provide an optical glass for precision press molding.
また、本発明の第２の目的は、屈折率（nd）が1.59〜
1.65、アッベ数（νｄ）が54以上という中屈折率低分散
で、かつ、長期間の実用に耐えうる非常に良好な化学的
耐久性及び耐候性を有する光学ガラスを提供することに
ある。Further, a second object of the present invention is that the refractive index (nd) is 1.59 to
An object of the present invention is to provide an optical glass having a medium refractive index and low dispersion of 1.65 and an Abbe number (νd) of 54 or more, and having very good chemical durability and weather resistance that can withstand long-term practical use.
課題を解決するための手段 本発明者等は以上のような従来の光学ガラス及びプレ
ス成形用光学ガラスの諸欠点をかんがみて、種々考察研
究した結果、SiO2、B2O3、Li2O、La2O3、Gd2O3、Al
2O3、ZrO2を必須とするガラス組成の光学ガラスは、中
屈折率低分散タイプ（nd＝1.59以上、νｄ＝54以上）の
光学ガラスとほぼ同等の光学恒数を有し、かつ、それら
よりもきわめて低い温度でプレス成形でき、型材への影
響もほとんどないこと、及び更に、上記特許のプレス成
形用光学ガラスよりも、安定性、化学的耐久性、耐候
性、溶融性にすぐれ、従来の光学ガラスと同様に扱え、
かつ、屈伏温度（At）が低いため、プレス成形後研削ま
たは研磨を必要としないプレスレンズ用光学ガラスとし
て最適であるところのガラス組成物を見出だし、本発明
に到達したものである。Means for Solving the Problems The present inventors have conducted various studies and studies in view of the above-described drawbacks of the conventional optical glass and the optical glass for press molding, and have found that SiO 2 , B 2 O 3 , and Li 2 O , La 2 O 3 , Gd 2 O 3 , Al
2 O 3 , the optical glass of the glass composition essential for ZrO 2 has an optical constant almost equal to the optical glass of the medium refractive index low dispersion type (nd = 1.59 or more, νd = 54 or more), and It can be press-molded at a temperature much lower than them, and has almost no effect on the mold material.Moreover, it has better stability, chemical durability, weather resistance, meltability than the optical glass for press molding of the above patent, Handled like conventional optical glass,
Further, the present inventors have found a glass composition which is most suitable as an optical glass for a press lens which does not require grinding or polishing after press molding because of a low yield temperature (At), and has reached the present invention.
すなわち、本発明を重量％で示すと SiO2 20 〜40 ％ B2O3 11 〜22 ％ ただし、 SiO2＋B2O3の合量 43 〜55 ％ Li2O 3 〜 8 ％ Na2O 0 〜 6 ％ ただし、 Li2O＋Na2Oの合量 7 〜11 ％ BaO ０ 〜22 ％ CaO ０ 〜16 ％ ZnO ０ 〜23 ％ La2O3 ２ 〜21 ％ Gd2O3 5.7〜15 ％ ただし、 La2O3＋Gd2O3の合量 7.7〜29 ％ Al2O3 0.5〜5.0 ％ ZrO2 0.2〜3.0 ％ からなる組成を有している。That is, when the present invention is expressed in terms of% by weight, SiO 2 20 to 40% B 2 O 3 11 to 22% However, the total amount of SiO 2 + B 2 O 3 43 to 55% Li 2 O 3 to 8% Na 2 O 0 However, the total amount of Li 2 O + Na 2 O is 7 to 11%, BaO is 0 to 22%, CaO is 0 to 16%, ZnO is 0 to 23%, La 2 O 3 is 2 to 21%, and Gd 2 O 3 is 5.7 to 15%. It has a composition of La 2 O 3 + Gd 2 O 3 combined 7.7-29% Al 2 O 3 0.5-5.0% ZrO 2 0.2-3.0%.
本発明に係わる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。The reasons for limiting the component ranges of the optical glass according to the present invention as described above are as follows.
SiO2はガラスの網目を構成する主成分であるが、40％
を超えると溶融時の粘性が大きくなり、軟化温度の上昇
をまねく。また、20％より少ないと失透傾向が増大し、
化学的耐久性が悪くなる。SiO 2 is the main component of the glass network, but 40%
If it exceeds, the viscosity at the time of melting becomes large, which leads to an increase in the softening temperature. If less than 20%, the tendency of devitrification increases,
Poor chemical durability.
B2O3は、SiO2と同様ガラスの網目を構成し、ガラスの
安定化に有効な成分である。また、ガラスの均質化にも
有効であり、さらに、適量含有することにより軟化温度
を下げる。しかし、11％より少ないと上記の効果が少な
く、22％より多くなると化学的耐久性が悪くなる。B 2 O 3 constitutes a glass network like SiO 2 and is a component effective for stabilizing the glass. It is also effective in homogenizing glass, and further contains a suitable amount to lower the softening temperature. However, if it is less than 11%, the above effect is small, and if it is more than 22%, the chemical durability deteriorates.
また、SiO2及びB2O3の合量が43〜55％を超えて増減す
ると、目的の光学恒数が得られなくなるので所定の範囲
内とする。Further, if the total amount of SiO 2 and B 2 O 3 is increased or decreased beyond 43 to 55%, a desired optical constant cannot be obtained, so that it is within a predetermined range.
Li2Oは、必須配合成分として適量含有させることによ
り、他のアルカリ成分に比べ化学的耐久性をそこなうこ
となく、著しくプレス成形温度を下げる効果を持つ。し
かし、３％より少ないと上記効果が少なく、８％より多
いと失透傾向の増大をまねく。When Li 2 O is contained in an appropriate amount as an essential compounding component, it has an effect of significantly lowering the press molding temperature without deteriorating the chemical durability as compared with other alkali components. However, if it is less than 3%, the above effect is small, and if it is more than 8%, the tendency of devitrification is increased.
Na2Oもプレス成形温度の低下に寄与するが、６％より
多いと失透傾向が増大するばかりでなく、化学的耐久性
も悪くなる。Na 2 O also contributes to lowering the press forming temperature, but if it exceeds 6%, not only the tendency to devitrify but also the chemical durability deteriorates.
また、Li2O及びNa2Oの合量が７％より少ないと、軟化
温度の低下に対する効果が少なく、11％より多いと、ガ
ラスの化学的耐久性が悪くなってしまうので所定内とす
る。If the total amount of Li 2 O and Na 2 O is less than 7%, the effect of lowering the softening temperature is small, and if the total amount is more than 11%, the chemical durability of the glass deteriorates. .
ZnOは任意配合成分であり、軟化温度の低下、光学恒
数の調整に非常に有効な成分であるが、23％より多くな
ると失透傾向が増大する。ZnO is an optional component and is a very effective component for lowering the softening temperature and adjusting the optical constant, but when it exceeds 23%, the tendency to devitrify increases.
BaOは任意配合成分であり、屈折率を高め低分散化に
有効な成分である。しかし、BaOの多量の使用はガラス
の化学的耐久性を悪くするので、その使用量は22％以内
とする。BaO is an optional component and is a component effective for increasing the refractive index and reducing the dispersion. However, the use of a large amount of BaO degrades the chemical durability of the glass, so the use amount should be within 22%.
CaOは任意配合成分であり、化学的耐久性の向上、光
学恒数の調整に有効な成分であるが、16％より多くなる
と失透傾向が増大する。CaO is an optional component and is an effective component for improving chemical durability and adjusting optical constants. However, if it exceeds 16%, the tendency of devitrification increases.
La2O3は必須配合成分であり、ガラスの高屈折率低分
散化に非常に有効である。また、化学的耐久性の向上に
も有効な成分である。しかし、２％より少ないと上記効
果が少なく、21％より多いと軟化温度を上昇させ、失透
傾向を増大させる。La 2 O 3 is an essential component, and is very effective in reducing the refractive index and the dispersion of glass. It is also an effective component for improving chemical durability. However, if it is less than 2%, the above effect is small, and if it is more than 21%, the softening temperature is increased, and the tendency to devitrify is increased.
Gd2O3は必須配合成分であり、La2O3と合わせて光学性
能の調整に使用されるが、15％より多いと軟化温度の上
昇をもたらす。Gd 2 O 3 is an essential component and is used in combination with La 2 O 3 to adjust the optical performance. If it is more than 15%, the softening temperature increases.
また、La2O3とGd2O3の合量が、４％より少ないと目的
の光学恒数が得られず、29％より多いとガラスの安定性
をそこなうばかりでなく、軟化温度を上昇させてしまう
ので、その範囲内とする ZrO2は、本発明において非常に重要な意味を持つ成分
であり、少量必須配合成分として適量加えることによ
り、ガラスの化学的耐久性を著しく向上させる。しか
し、0.2％より少ないと上記効果が少なく、３％より多
いと失透傾向が増大してしまう。If the total content of La 2 O 3 and Gd 2 O 3 is less than 4%, the desired optical constant cannot be obtained. If the total content is more than 29%, not only does the glass lose stability, but also the softening temperature increases. ZrO 2 , which falls within the range, is a very important component in the present invention, and when added in a small amount in an appropriate amount as an essential compounding component, the chemical durability of the glass is significantly improved. However, if it is less than 0.2%, the above effect is small, and if it is more than 3%, the devitrification tendency is increased.
Al2O3は必須配合成分であり、ZrO2と同様ガラスの化
学的耐久性の向上に非常に有効であるが、0.5％より少
ないとその効果が少なく、５％を超えるとガラスの軟化
温度を上昇させるので所定内とする。Al 2 O 3 is an essential compounding component and is very effective in improving the chemical durability of glass like ZrO 2 , but less than 0.5% has little effect and the softening temperature of glass exceeds 5% Is set within a predetermined range.
次に、本発明に係わる実施例の組成（数値は重量
％）、屈折率（nd）、アッベ数（νｄ）、屈伏温度（A
t）、耐水性（ランク）を第１表に示す。ここで、耐水
性（Rw）については、日本光学硝子工業会規格JOGIS−0
6−1975の化学的耐久性測定法に準じて行ったものであ
る。すなわち、標準網ふるい420〜590μｍ内にとどまる
粉末ガラス試料を、99℃以上の純水中で60分間処理し
て、処理前後の試料の減量率（％）を求め、その減量率
によって表Ａに示した６階級に区分する方法である。Next, the composition (numerical value is% by weight), refractive index (nd), Abbe number (νd), yield temperature (A) of the examples according to the present invention.
Table 1 shows t) and water resistance (rank). Here, regarding the water resistance (Rw), JOGIS-0 standard of Japan Optical Glass Industrial Association
This was performed according to the chemical durability measurement method of 6-1975. That is, a powdered glass sample remaining within a standard mesh sieve of 420 to 590 μm was treated in pure water at 99 ° C. or higher for 60 minutes, and the weight loss rate (%) of the sample before and after the treatment was determined. This is a method of dividing into the six classes shown.
本発明の光学ガラスは、各成分の原料としてそれぞれ
相当する酸化物、水酸化物、炭酸塩、硝酸塩等を使用
し、所定の割合で秤量し充分混合したものをガラス調合
原料とし、白金製るつぼに投入して電気炉で1000〜1300
℃で溶融し、白金製撹拌棒で撹拌して、清澄、均質化し
てから適当な温度に予熱した金型内に鋳込んだ後、徐冷
して作る。なお、ガラスの着色を防ぎ、脱泡のために少
量のAs2O3を加えること、又は、工業上良く知られてい
る脱泡成分の少量添加は、本発明の効果に影響を与えな
い。 The optical glass of the present invention uses a corresponding oxide, hydroxide, carbonate, nitrate, or the like as a raw material for each component, weighs it at a predetermined ratio, and thoroughly mixes the mixture to obtain a glass blending raw material, and a platinum crucible. 1000 to 1300 in an electric furnace
Melted at ℃, stirred with a platinum stirrer, clarified and homogenized, cast into a mold preheated to an appropriate temperature, and then gradually cooled. The addition of a small amount of As 2 O 3 for preventing coloring of the glass and defoaming, or the addition of a small amount of a defoaming component which is well known in the industry does not affect the effects of the present invention.
発明の効果 本発明によれば、屈伏温度（At）が550℃以下で、屈
折率（nd）が1.59〜1.65、アッベ数（νｄ）が54以上の
光学恒数を有し、失透に対して安定で、長期間の実用に
耐えうる非常に良好な化学的耐久性を持ち、きわめて低
い温度で精密プレスができ、プレス成形後研削または研
磨を必要としない精密プレスレンズ用光学ガラスが得ら
れる。Effect of the Invention According to the present invention, the material has an optical constant having a yield temperature (At) of 550 ° C. or less, a refractive index (nd) of 1.59 to 1.65, and an Abbe number (νd) of 54 or more. Optical glass for precision press lenses that is stable, has very good chemical durability that can withstand long-term practical use, can be precision pressed at extremely low temperatures, and does not require grinding or polishing after press molding .
Claims (1)
す） B2O3 11 〜22％ ただし、 SiO2＋B2O3の合量 43 〜55％ Li2O 3 〜 8％ Na2O 0 〜 6％ ただし、 Li2O＋Na2Oの合量 ７ 〜11％ BaO ０ 〜22％ CaO ０ 〜16％ ZnO ０ 〜23％ La2O3 ２ 〜21％ Gd2O3 5.7〜15％ ただし、 La2O3＋Gd2O3の合量 7.7〜29％ Al2O3 0.5〜5.0％ ZrO2 0.2〜3.0％ 以上から成る屈伏温度（At）が550℃以下で、屈折率（n
d）が1.59〜1.65であり、アッベ数（νｄ）が54以上の
軟化温度がきわめて低い中屈折率低分散の精密プレスレ
ンズ用光学ガラス。(1) SiO 2 20 to 40% by weight (hereinafter referred to as%) B 2 O 3 11 to 22% However, the total amount of SiO 2 + B 2 O 3 is 43 to 55% Li 2 O 3 to 8% Na 2 O 0 to 6% However, total amount of Li 2 O + Na 2 O 7 to 11% BaO 0 to 22% CaO 0 to 16% ZnO 0 to 23% La 2 O 3 2 to 21% Gd 2 O 3 5.7 to 15% However, the total temperature of La 2 O 3 + Gd 2 O 3 7.7 to 29% Al 2 O 3 0.5 to 5.0% ZrO 2 0.2 to 3.0% The deformation temperature (At) of 550 ° C. or less and the refractive index (n
d) is 1.59 to 1.65, Abbe number (νd) is 54 or more, and the softening temperature is extremely low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1172775A JP2726310B2 (en) | 1989-07-04 | 1989-07-04 | Optical glass for precision press molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1172775A JP2726310B2 (en) | 1989-07-04 | 1989-07-04 | Optical glass for precision press molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0337130A JPH0337130A (en) | 1991-02-18 |
| JP2726310B2 true JP2726310B2 (en) | 1998-03-11 |
Family
ID=15948114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1172775A Expired - Lifetime JP2726310B2 (en) | 1989-07-04 | 1989-07-04 | Optical glass for precision press molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2726310B2 (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4923366B2 (en) * | 2001-09-13 | 2012-04-25 | 日本電気硝子株式会社 | Optical glass for mold press molding |
| JP3555681B2 (en) * | 2001-10-29 | 2004-08-18 | 日本電気硝子株式会社 | Glass for mold press molding |
| DE10309495B4 (en) | 2003-02-25 | 2006-02-16 | Schott Ag | Aluminosilicate glass and its use |
| 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 |
| JP4140775B2 (en) * | 2004-01-23 | 2008-08-27 | Ｈｏｙａ株式会社 | Optical glass, precision press-molding preform and manufacturing method thereof, and optical element and manufacturing method thereof |
| JP4792718B2 (en) * | 2004-07-09 | 2011-10-12 | コニカミノルタオプト株式会社 | Optical glass and optical element |
| JP2007145615A (en) * | 2005-11-25 | 2007-06-14 | Konica Minolta Opto Inc | Optical glass and optical element |
| WO2007097344A1 (en) | 2006-02-21 | 2007-08-30 | Asahi Glass Co., Ltd. | Optical glass |
| CN101454251B (en) | 2006-05-22 | 2012-04-04 | 旭硝子株式会社 | Optical glass |
| JP5660270B2 (en) * | 2008-10-21 | 2015-01-28 | 日本電気硝子株式会社 | Optical glass |
| JP5700350B2 (en) * | 2009-07-23 | 2015-04-15 | 日本電気硝子株式会社 | Optical glass |
| JP5824922B2 (en) * | 2011-07-11 | 2015-12-02 | 日本電気硝子株式会社 | Optical glass |
| JP6560854B2 (en) * | 2014-10-27 | 2019-08-14 | Hoya株式会社 | Optical glass, optical element and optical glass material |
| JP6576040B2 (en) * | 2015-01-07 | 2019-09-18 | Hoya株式会社 | Optical glass, optical element and optical glass material |
| WO2016068124A1 (en) * | 2014-10-27 | 2016-05-06 | Hoya株式会社 | Optical glass, optical element and optical glass material |
| JP6735402B2 (en) * | 2019-08-20 | 2020-08-05 | Hoya株式会社 | Optical glass, optical element and optical glass material |
| CN114907010B (en) * | 2022-06-22 | 2023-08-15 | 成都光明光电股份有限公司 | Optical glass |
| CN114853337B (en) * | 2022-06-22 | 2023-08-25 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element, and optical instrument |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221338A (en) * | 1984-04-12 | 1985-11-06 | Ohara Inc | Optical glass |
| JPH0686308B2 (en) * | 1985-11-22 | 1994-11-02 | 株式会社住田光学ガラス | Optical glass |
| JP2535407B2 (en) * | 1989-05-31 | 1996-09-18 | ホーヤ株式会社 | Optical glass |
-
1989
- 1989-07-04 JP JP1172775A patent/JP2726310B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0337130A (en) | 1991-02-18 |
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