JP2616980B2 - Optical glass for precision press molding - Google Patents
Optical glass for precision press moldingInfo
- Publication number
- JP2616980B2 JP2616980B2 JP63276492A JP27649288A JP2616980B2 JP 2616980 B2 JP2616980 B2 JP 2616980B2 JP 63276492 A JP63276492 A JP 63276492A JP 27649288 A JP27649288 A JP 27649288A JP 2616980 B2 JP2616980 B2 JP 2616980B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- optical
- temperature
- optical glass
- press molding
- 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
-
- 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
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
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］ 本発明は比較的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: TECHNICAL FIELD The present invention relates to an optical glass for a precision press lens that can be press-formed at a relatively 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＝1.53以上、νｄ＝59.0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燐
酸塩系ガラス（特開昭58−79839号公報、特開昭60−122
749号公報、欧州特許第19342号明細書、参照）、フツホ
ウ酸塩系ガラス（特開昭59−146952号公報参照）、フル
オロ燐酸塩系ガラス（特開昭56−59641号公報、特開昭5
6−149343号公報、特開昭58−217451号公報参照）が知
られている。[Prior Art] Conventionally, there is an optical glass of a medium refractive index and low dispersion type (nd = 1.53 or more, νd = 59.0 or more) having the same optical constant. Further, as a glass for press molding, a phosphate glass (JP-A-58-79839, JP-A-60-122)
No. 749, European Patent No. 19342, refer to), fluoroborate-based glass (see JP-A-59-146952), and fluorophosphate-based glass (JP-A-56-59641, JP-A-56-59641). Five
No. 6-149343 and JP-A-58-217451) are 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＝1.53
以上、νｄ＝59.0以上）の光学ガラスは、屈伏温度（A
t）が600℃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650℃を超える高い温度でなければ成形す
ることが出来なかった。精密プレス成形の公知の型材等
では、プレス成形温度が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レンズの量産には適
さない。そのためプレスされるガラスは可能な限り低い
温度で成形されるのが望ましい。これらの問題を解決す
るためとして、上記プレス成形用ガラスの公開公報で
は、ガラス形成酸化物に燐酸、及びホウ酸を選んでい
る。しかし、前記の燐酸塩系ガラス（特開昭58−79839
号公報、特開昭60−122749号公報、欧州特許第19342号
明細書）等では、低軟化点ガラス組成が示されているも
のの、本特許における光学恒数を持つガラスが見当ら
ず、また鉛を含んでいるガラスも上記特許中に見られる
が、鉛を含むと鉛の揮発物が型材に付着し面精度の保持
等に問題が生じる。さらに化学的耐久性の点で不十分な
ものもある。[Problem to be Solved by the Invention] However, a medium-refractive-index low-dispersion type (nd = 1.53
As described above, the optical glass having νd = 59.0 or more) has a yield temperature (A
t) was only 600 ° C. or higher, and the press temperature was too high to exceed 650 ° C. to form. In a known mold material of precision press molding, when the press molding temperature is high, a problem such as oxidation of the mold material occurs, and it is difficult to maintain the surface accuracy, which is not suitable for mass production of lenses. Therefore, it is desirable that the glass to be pressed 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, the above-mentioned phosphate glass (JP-A-58-79839)
Japanese Patent Application Laid-Open No. Sho 60-1222749, European Patent No. 19342), etc., show a glass composition having a low softening point. Although glass containing chromium is also found in the above patents, if it contains lead, volatiles of lead will adhere to the mold and cause problems in maintaining surface accuracy. Further, some of them are insufficient in terms of chemical durability.
フツホウ酸塩系ガラス（特開昭59−146952号公報）、
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）等
では、ガラス組成にフッ素を含んでいるが、フッ素の導
入は、低温化及び低分散化には有利であるが、ガラス溶
融時における安定性に欠け均質なガラスが得られにく
く、プレス温度におけるフッ素の揮発による型材は、環
境等に問題が生じやすい。さらに上記特許組成中には燐
酸塩系ガラスに見られたと同様鉛を含むものもあり、プ
レス用ガラスとしては適当ではない。Fluoroborate-based glass (JP-A-59-146952),
Fluorophosphate glass (JP-A-56-59641,
JP-A-56-149343 and JP-A-58-217451) contain fluorine in the glass composition, and the introduction of fluorine is advantageous for lowering the temperature and reducing the dispersion. It is difficult to obtain a homogeneous glass due to lack of stability at the time of melting, and the mold material due to the volatilization of fluorine at the pressing temperature tends to cause problems in the environment and the like. Further, some of the above-mentioned patent compositions contain lead as in the case of phosphate glass, and are not suitable as press glass.
従って本発明の第１の目的は、比較的低い温度（550
℃以下）で精密プレスが実施される精密プレス用光学ガ
ラスを提供することにある。Accordingly, a first object of the present invention is to provide a relatively low temperature (550
The present invention is to provide an optical glass for precision press in which precision press is performed at a temperature of not more than ℃.
また本発明の第２の目的は屈折率（nd）1.53〜1.62、
アッベ数（νｄ）59.0〜64.0という中屈折率低分散の光
学ガラスを提供することにある。A second object of the present invention is to provide a refractive index (nd) of 1.53 to 1.62,
An object of the present invention is to provide an optical glass having a medium refractive index and a low dispersion having an Abbe number (νd) of 59.0 to 64.0.
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、P2O5、ZnO及び／又はBaO及び／又はSrO及
び／又はCaO及び／又はMgOを必須とするガラス組成の光
学ガラスが、中屈折率低分散タイプの光学ガラスとほぼ
同等の光学恒数を有し、かつこれよりも低い温度におい
てプレス成形でき、型材への影響も殆どないことを見い
出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. As a result, P 2 O 5 , ZnO and / or BaO and An optical glass having a glass composition that essentially requires SrO and / or CaO and / or MgO has an optical constant substantially equal to that of a medium-refractive-index, low-dispersion type optical glass, and is pressed at a lower temperature. The present invention has been found to be able to be formed and has almost no effect on the mold material, and has reached the present invention.
すなわち本発明の光学ガラスは、所定の組成範囲内に
おいて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、溶融性が優れており、従来
の光学ガラスと同様に扱え、かつ屈伏温度（At）が低い
ので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として最適であるという結論に
達した。That is, the optical glass of the present invention has better stability, chemical durability, weatherability, and melting property than the optical glass for press molding of the above patent within a predetermined composition range, and is similar to the conventional optical glass. It has been concluded that it is optimal as an optical glass for precision press lenses that does not require grinding or polishing after press forming because of its handling and low yield temperature (At).
すなわち本発明を重量％で示すと P2O5 45〜62重量％（以下％で示す） B2O3 ０〜 7 ％ ZnO 15〜35 ％ BaO ０〜30 ％ SrO ０〜15 ％ CaO ０〜10 ％ MgO ０〜 3.5％ 但し、ZnO＋BaO＋SrO＋CaO＋MgOの合量 28〜49 ％ Li2O ０〜 5 ％ Al2O3 ０〜 9 ％ Nb2O5 ０〜 1.5％ ZrO2 ０〜 1.0％ からなる組成を有している。That is, showing the present invention in weight% P 2 O 5 45~62 wt% (shown below%) B 2 O 3 0~ 7 % ZnO 15~35% BaO 0~30% SrO 0~15% CaO 0~ 10% MgO 0~ 3.5%, however, the composition consisting of ZnO + BaO + SrO + CaO + the total amount of MgO 28~49% Li 2 O 0~ 5 % Al 2 O 3 0~ 9% Nb 2 O 5 0~ 1.5% ZrO 2 0~ 1.0% Have.
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.
P2O5はガラスの網目を構成する主成分であり、ガラス
の安定化、また屈伏温度（At）の低温度化、さらに分散
の低分散化に有効である。しかし45％より少ないとガラ
スが不安定になり、62％より多くなると化学的耐久性が
悪くなる。P 2 O 5 is a main component of the glass network, and is effective for stabilizing the glass, lowering the yield temperature (At), and lowering the dispersion. However, if it is less than 45%, the glass becomes unstable, and if it exceeds 62%, the chemical durability becomes poor.
B2O3はP2O5と同様ガラスの網目を構成し屈伏温度（A
t）の低温度化に有効である。しかし７％より多くなる
と化学的耐久性が非常に悪くなる。B 2 O 3 forms a glass network like P 2 O 5 and has a yield temperature (A
It is effective for lowering the temperature of t). However, if it exceeds 7%, the chemical durability becomes very poor.
ZnO及びBaO及びSrO及びCaO及びMgOは、屈折率の調
整、化学的耐久性の向上、さらに屈伏温度（At）の低温
度化に有効な成分であるが、その合量が28％より少ない
と所定の光学恒数が得られず、49％より多くなるとガラ
スの安定性が悪くなる。ZnO and BaO and SrO and CaO and MgO are effective components for adjusting the refractive index, improving the chemical durability, and lowering the yield temperature (At). However, if the total amount is less than 28%, If the predetermined optical constant is not obtained, and if it exceeds 49%, the stability of the glass deteriorates.
ZnOは他の成分に比べガラスの屈伏温度（At）の低温
度化、また光学恒数の調整に非常に有効な成分である。
しかし15％より少ないと上記の効果が少なく、35より多
くなると失透傾向を増してしまうので所定の範囲内とす
る。ZnO is a very effective component for lowering the yield temperature (At) of glass and adjusting optical constants compared to other components.
However, if it is less than 15%, the above effect is small, and if it is more than 35, the tendency of devitrification is increased.
BaOはZnOと同様屈伏温度（At）の低温度化に有効であ
り、さらにガラスの安定性の向上、また屈折率を高め低
分散化するのに有効な成分である。しかしながら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30％以内とする。BaO, like ZnO, is an effective component for lowering the yield temperature (At), and is also a component effective for improving the stability of the glass and increasing the refractive index to reduce the dispersion. However, the use of a large amount of BaO deteriorates the chemical durability of the glass, so the amount of use is limited to 30% or less.
SrOは光学恒数の調整に使用する成分であるが、15％
より多くなるとガラスの安定性を損なうので、所定内と
する。SrO is a component used to adjust optical constants, but 15%
If the number is too large, the stability of the glass is impaired.
CaOは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、10％より多くなると失透傾向が増大す
る。CaO is a component effective for improving the chemical durability and adjusting the optical constant, but when it exceeds 10%, the tendency to devitrify increases.
MgOはCaOと同様ガラスの化学的耐久性を向上するのに
有効な成分であるが、その使用量を多くするとガラスの
安定性を損なうので3.5％以内とする。MgO, like CaO, is an effective component for improving the chemical durability of glass. However, if the amount of MgO used increases, the stability of the glass is impaired.
Li2Oは少量の配合成分として適量加えることにより、
ガラスの安定性を損なうことなく著しくプレス成形時の
温度を下げる効果を持つ。しかし５％より多くなるとガ
ラスの失透傾向を増し、さらに化学的耐久性が悪くなる
ので所定の範囲内とする。By adding an appropriate amount of Li 2 O as a small amount of ingredients,
It has the effect of significantly lowering the temperature during press molding without impairing the stability of the glass. However, if it exceeds 5%, the tendency of devitrification of the glass increases, and the chemical durability further deteriorates.
Al2O5はガラスの化学的耐久性の向上に非常に有効で
あるが、９％より多くなると、ガラスの軟化温度が上昇
してしまうので、所定内とする。Al 2 O 5 is very effective in improving the chemical durability of the glass, but if it exceeds 9%, the softening temperature of the glass will increase.
Nb2O5及びZrO2は少量添加することによって、光学恒
数の微調整を行なうための成分である。しかしながらNb
2O5については、1.5％より多くなると、またZrO2につい
ては、1.0％より多くなると、所定の光学恒数の範囲を
超えてしまうと共に、ガラスの安定性が悪くなるので、
その範囲内に限定する。Nb 2 O 5 and ZrO 2 are components for finely adjusting the optical constant by adding a small amount. However, Nb
For 2 O 5, if it is more than 1.5%, and for ZrO 2, if it is more than 1.0%, the range of the predetermined optical constants will be exceeded and the stability of the glass will be deteriorated.
Limit within that range.
本発明の光学ガラスには、上記成分の他に光学性能の
調整、溶融性の改善、ガラス化範囲の拡大等のために、
本発明の目的から外れない限りNa2O、K2O、Cs2O、Si
O2、Y2O3、Ta2O5、La2O3などを含有させることができ
る。In the optical glass of the present invention, in addition to the above components, to adjust the optical performance, improve the meltability, expand the vitrification range, and the like,
Na 2 O, K 2 O, Cs 2 O, Si
O 2 , Y 2 O 3 , Ta 2 O 5 , La 2 O 3 and the like can be contained.
［実施例］ 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（At）を第
１表に示す。[Examples] Next, the compositions (numerical values are% by weight) of Examples according to the present invention,
Table 1 shows the refractive index (nd), Abbe number (νd), and yield temperature (At).
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、燐酸塩、炭酸塩、硝酸塩等を使
用し、所定の割合で秤量し、充分混合してガラス調合原
料として、白金製坩堝に投入して電気炉で1000℃〜1300
℃で溶融し、白金製撹拌棒にて撹拌して、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。 The optical glass of the present invention uses the corresponding oxides, hydroxides, phosphates, carbonates, nitrates, etc. as the raw materials for each component, weighs them at a predetermined ratio, mixes them well, and mixes them as glass raw materials. Put in a platinum crucible and use an electric furnace at 1000 ℃ ~ 1300
Melting at ℃, stirring with a platinum stirring bar, fining, homogenizing, casting into a mold preheated to an appropriate temperature, and then gradually cooling.
なおガラスの着色を防ぎ、脱泡のため少量のAs2O3を
加えること、また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。Incidentally prevent coloration of the glass, adding a small amount of a small amount of As 2 O 3 adding or industrial well-known defoaming component for defoaming 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500℃以下で、屈
折率（nd）が1.53〜1.62、アッベ数（νｄ）が59.0〜6
4.0の光学恒数を有し、失透に対して安定であり、比較
的低い温度で精密プレスでき、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。According to the present invention, the yield temperature (At) is 500 ° C. or less, the refractive index (nd) is 1.53 to 1.62, and the Abbe number (νd) is 59.0 to 6
An optical glass for precision press lenses that has an optical constant of 4.0, is stable against devitrification, can be precision pressed at a relatively low temperature, and does not require grinding or polishing after press molding is obtained.
Claims (1)
が1.53〜1.62であり、アッベ数（νｄ）が59.0〜64.0で
軟化点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. A P 2 O 5 45~62 (shown below%) wt% B 2 O 3 0~ 7% ZnO 15~35% BaO 0~30% SrO 0~15% CaO 0~10% MgO 0 ~ 3.5%, however, ZnO + BaO + SrO + CaO + MgO in the total amount 28~49% Li 2 O 0~ 5% Al 2 O 3 0~ 9% Nb 2 O 5 0~ 1.5% ZrO 2 0~ consisting of 1.0% yield temperature (At) is Refractive index (nd) below 500 ℃
Is 1.53 to 1.62, the Abbe number (νd) is 59.0 to 64.0, and the softening point is extremely low.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63276492A JP2616980B2 (en) | 1988-11-01 | 1988-11-01 | Optical glass for precision press molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63276492A JP2616980B2 (en) | 1988-11-01 | 1988-11-01 | Optical glass for precision press molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02124743A JPH02124743A (en) | 1990-05-14 |
| JP2616980B2 true JP2616980B2 (en) | 1997-06-04 |
Family
ID=17570212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63276492A Expired - Lifetime JP2616980B2 (en) | 1988-11-01 | 1988-11-01 | Optical glass for precision press molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2616980B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316447A (en) * | 1997-05-14 | 1998-12-02 | Nikon Corp | Optical glass |
| JP2002211949A (en) * | 2001-01-12 | 2002-07-31 | Minolta Co Ltd | Optical glass for press molding, preform material for press molding and optical element using the same |
| JP4818538B2 (en) * | 2001-07-13 | 2011-11-16 | 株式会社住田光学ガラス | Optical glass for molding |
| EP1440950B1 (en) | 2001-10-30 | 2016-07-06 | Sumita Optical Glass, Inc. | Optical glass suitable for mold forming |
| DE10239572B3 (en) * | 2002-08-23 | 2004-01-08 | Schott Glas | Lead-free and preferably arsenic-free optical heavy crown glasses and their use |
| JP2004168593A (en) * | 2002-11-20 | 2004-06-17 | Minolta Co Ltd | Optical glass |
| JP4442168B2 (en) * | 2003-09-10 | 2010-03-31 | コニカミノルタオプト株式会社 | Optical glass and optical element |
| EP1555247A1 (en) | 2004-01-16 | 2005-07-20 | Schott AG | Optical glass in particular for press-moulded optical elements |
| JP5296345B2 (en) * | 2007-08-10 | 2013-09-25 | 株式会社オハラ | Optical glass |
| JP5298695B2 (en) | 2008-08-06 | 2013-09-25 | コニカミノルタ株式会社 | Optical glass and optical element |
| DE102009011508B4 (en) | 2009-03-06 | 2017-03-09 | Schott Ag | Optical glass and its use |
| JP5672665B2 (en) * | 2009-05-22 | 2015-02-18 | コニカミノルタ株式会社 | Optical glass |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361608A (en) * | 1976-11-16 | 1978-06-02 | Hoya Glass Works Ltd | Infrareddabsorbing glass of low melting point |
| NL7903914A (en) * | 1979-05-18 | 1980-11-20 | Philips Nv | GLASS, METHOD FOR PREPARING GLASS, GLASS ARTICLES. |
| NL8104778A (en) * | 1981-10-22 | 1983-05-16 | Philips Nv | PRECISIONALLY PRESSED GLASS OPTICS AND SUITABLE GLASS. |
| JPS60122749A (en) * | 1983-12-02 | 1985-07-01 | Hoya Corp | Optical glass |
-
1988
- 1988-11-01 JP JP63276492A patent/JP2616980B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02124743A (en) | 1990-05-14 |
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