JPH0350138A - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JPH0350138A JPH0350138A JP18359989A JP18359989A JPH0350138A JP H0350138 A JPH0350138 A JP H0350138A JP 18359989 A JP18359989 A JP 18359989A JP 18359989 A JP18359989 A JP 18359989A JP H0350138 A JPH0350138 A JP H0350138A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- optical glass
- optical
- li2o
- press
- 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 24
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000005355 lead glass Substances 0.000 claims abstract description 9
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract description 13
- 238000000465 moulding Methods 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 abstract description 9
- 238000000227 grinding Methods 0.000 abstract description 7
- 238000005498 polishing Methods 0.000 abstract description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 230000009477 glass transition Effects 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 229910001947 lithium oxide Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000000930 thermomechanical effect Effects 0.000 description 2
- AIRCTMFFNKZQPN-UHFFFAOYSA-N AlO Inorganic materials [Al]=O AIRCTMFFNKZQPN-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000004031 devitrification Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000005303 fluorophosphate glass Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000005365 phosphate glass Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
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
- C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
-
- 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
- C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
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)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、プレスレンズ用の光学ガラスに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical glass for press lenses.
［従来の技術］
従来、プレスレンズ用の光学ガラスとしては、比較的良
好な光学恒数を持つものとしてＳＦタイプ、及びＦタイ
プが知られている。さらに、これらプレスレンズ用のガ
ラスを改良するものとしては、リン酸塩系ガラス（特開
昭５５−１５４３４３ 、特開昭５８−７９８３９、特
開昭６０−１２２７４９参照）、フルオロリン酸塩系ガ
ラス（特開昭５６−５９６４１、特開昭５６−１４９３
４３ 、特開昭５８−２１７４５１参照）フッホウ酸塩
系ガラス（特開昭５９−１４６９５２ 、特開昭６２−
１０６４４９参照）、アルミノフルオロホウケイ酸鉛系
ガラス（特開昭５９−８３９５９）が知られている。[Prior Art] Conventionally, as optical glasses for press lenses, SF type and F type are known as having relatively good optical constants. Furthermore, as improvements to these glasses for press lenses, phosphate glass (see JP-A-55-154343, JP-A-58-79839, JP-A-60-122749), fluorophosphate glass (JP-A-56-59641, JP-A-56-1493
43, JP-A-58-217451) fluoroborate glass (JP-A-59-146952, JP-A-62-
106449) and aluminofluoroborosilicate lead glass (Japanese Unexamined Patent Publication No. 59-83959) are known.
［発明が解決しようとする課題］
しかしながら、従来よりあるＳＦタイプ、及びＦタイプ
の光学ガラスはプレス成形する温度まで加熱するとガラ
ス表面より鉛の揮発が起こるため、型や成形品の表面が
白くくもってしまうという欠点があり、このためプレス
成形後の研削又は研摩は不可欠な工程であった。[Problem to be solved by the invention] However, when the conventional SF type and F type optical glasses are heated to the temperature for press molding, lead volatilizes from the glass surface, so the surface of the mold and molded product becomes white. It has the disadvantage of being sticky, and for this reason, grinding or polishing after press molding has been an essential step.
そこで、この欠点を改良する目的でプレス成形後、研削
または研摩を必要としない精密プレス加工の型材その他
について開発が進められ前記した様に特許公報等で発表
されている。ここで、プレス成形温度か高温になると型
材の酸化等の問題が起り、面精度の保持が難しくが産に
は適さないう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か望ましい。そこで、航記従
来の技術ではそのために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のである。しかしリン酸及び
ホウ酸は、低温化には有利ではあるが、ガラスの光学的
耐久性及び耐候性に問題が生じやすい。またフッ素の導
入は、低温化及び低分散化に有利であるが、ガラス溶融
時における安定性、プレス温度におけるフッ素の揮発に
よる型材、環境等に間″ｊＦＪが生じやすい。Therefore, in order to improve this drawback, the development of precision press-formed mold materials that do not require grinding or polishing after press-forming has been carried out, and these developments have been published in patent publications and the like as mentioned above. If the press molding temperature is too high, problems such as oxidation of the mold material will occur, making it difficult to maintain surface accuracy and making it unsuitable for production. Therefore, it is desirable to press the glass at the lowest possible temperature. . Therefore, in the prior art, phosphoric acid and boric acid are selected as glass-forming oxides. However, although phosphoric acid and boric acid are advantageous in lowering the temperature, they tend to cause problems in the optical durability and weather resistance of glass. Introducing fluorine is advantageous in lowering the temperature and reducing dispersion, but it tends to cause problems with the stability during glass melting, the mold material, the environment, etc. due to the volatilization of fluorine at the pressing temperature.
本発明は上記従来技術の実情に鑑みなされたものであり
、プレス成形後研削や研摩を必要としない優れた光学ガ
ラスを提供するものである。The present invention has been made in view of the above-mentioned state of the prior art, and provides an excellent optical glass that does not require grinding or polishing after press molding.
［課題を解決するための手段］
すなわち、本発明は、酸化リチウム（Ｌｉ２０）が０．
３−４０重（１％の割合で含有されている鉛ガラスから
成るプレスレンズ用光学ガラスであり、プレス成形後の
研削及び研摩を施すことなく優れた光学恒数を有する光
学ガラスを得ることを可能としたものである。[Means for Solving the Problems] That is, the present invention provides that lithium oxide (Li20) is 0.
This is an optical glass for press lenses made of lead glass containing 3-40 weight (1%), and it is possible to obtain optical glass with excellent optical constants without grinding or polishing after press molding. This made it possible.
本発明者らは、従来よりある鉛ガラスに酸化リチウムＬ
ｉ、０を添加することにより、ＳＦタイプ及びＦ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、極めて低い温度でプレスが可能なためガラス
表面からの鉛の揮発がほとんど生じないこと、及び更に
前記従来のプレスレンズ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摩を必要としないことを見出
し、本発明に到達したものである。The present inventors discovered that lithium oxide L was added to the conventional lead glass.
By adding i and 0, it has optical constants almost equivalent to SF type and F type optical glasses, and can be press-formed at a lower temperature, with almost no effect on the mold material, at an extremely low temperature. Because it can be pressed with a glass surface, there is almost no lead volatilization from the glass surface, and it also has better stability and
It has excellent chemical durability, weather resistance, and meltability, can be handled in the same way as conventional optical glass, and has a low yielding temperature (At).
The present invention was achieved based on the discovery that grinding or polishing is not required after press molding.
すなわち、本発明は鉛ガラスの成分に酸化リチウムＬｉ
２Ｏを添加することにより達成されるものであるが、具
体的に本発明を実施するにあたっては、下記に示す成分
比において、好適、に行なうことができる。該成分比を
重量％で示すと、５ｉＯｚ １５−５０％
Ｐｂ０ ３５−８０％
Ｌｉ２Ｏ０，：Ｉ −４０％
Ｎａ２Ｏ＋ Ｋ、０ ＋ Ｌｉ２Ｏ０，３−４０％Ｂ２
０３０−１０％
からなる組成を有している。That is, the present invention includes lithium oxide Li as a component of lead glass.
This can be achieved by adding 2O, but when specifically implementing the present invention, it can be suitably carried out using the component ratios shown below. When the component ratio is expressed in weight%, 5iOz 15-50% Pb0 35-80% Li2O0,:I -40% Na2O+ K,0 + Li2O0,3-40%B2
It has a composition of 0.030-10%.
本発明に係る光学ガラスの各成分範囲を上記のように限
定する理由は次のとおりである。The reason why the range of each component of the optical glass according to the present invention is limited as described above is as follows.
５ｉｎ２はガラスの鋼目を構成する主成分であるが、５
０％を超えると、溶融時の粘性が大きくなり屈伏温度（
Ａシ）の、ト昇をまねき、１５％より少ないと失速傾向
が大きくなる。5in2 is the main component that makes up the steel grains of glass, but 5in2
If it exceeds 0%, the viscosity during melting increases and the yield temperature (
If it is less than 15%, there is a strong tendency to stall.
ＰｂＯは、適量含有させることにより屈伏温度（Ａｔ）
を下げる。しかし３５％より少ないと上記の効果が少な
く、８０％より多くなると化学的耐久性が悪くなる。By containing an appropriate amount of PbO, the yield temperature (At)
lower. However, if it is less than 35%, the above effect will be small, and if it is more than 80%, chemical durability will deteriorate.
Ｌｉ２Ｏは、本発明において重要な意味を持つ成分であ
り、Ｌｉ２Ｏを必須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。Li2O is an important component in the present invention, and by adding an appropriate amount of Li2O as an essential compounding component, it has the effect of significantly lowering the temperature during press molding without impairing the stability of the glass.
Ｌｉ２Ｏが０．３％より少ないと上記効果が少なく、４
０％より多いと失速傾向の増大をまねく。If Li2O is less than 0.3%, the above effects will be small, and 4
If it is more than 0%, the tendency to stall increases.
Ｎａ２Ｏ，に２０もそれぞれプレス成形時の温度降下に
寄与するが、Ｎａ、０＋ Ｋ２Ｏ＋ Ｌｉ２Ｏが４０％
より多いと失速傾向が増大するばかりでなく、化学的耐
久性も悪くなる。Na2O and 20 each contribute to the temperature drop during press forming, but Na, 0 + K2O + Li2O account for 40%.
When the amount is higher, not only does the tendency to stall increase, but also the chemical durability deteriorates.
Ｂ２０．は任意配合成分であり、屈伏温度（Ａｔ）を下
げるがＢ２Ｏ３を１０％より多くすると失速傾向の増大
、化学的耐久性の悪化をまねくのでこれ以下とする。B20. is an optional compounding component that lowers the yielding temperature (At), but if B2O3 exceeds 10%, it increases the tendency to stall and deteriorates chemical durability, so it should be kept below this value.
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、Ａｌ２Ｏ３、ＺｎＯ、口
ａＯ、ＴｉＯ２などを含有させることができる。In addition to the above-mentioned components, the optical glass of the present invention may contain Al2O3, ZnO, AlO, TiO2, etc., in order to adjust the optical performance, improve meltability, expand the vitrification range, etc., as long as they do not depart from the purpose of the present invention. etc. can be contained.
尚、本発明の光学ガラスを作製する方法としては、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、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
ルツボに投入して’（Ｌ気炉で９００−１２００℃で溶
融し、白金製攪拌機にて攪拌して、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
作ることができる。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 is manufactured by using the corresponding oxides, hydroxides, carbonates, nitrates, etc. as raw materials for each component, and weighing them in predetermined proportions. Mix thoroughly and put into a platinum crucible as a raw material for glass preparation (melt at 900-1200℃ in an L air furnace, stir with a platinum stirrer, clarify and homogenize, and then bring to an appropriate temperature. It can be made by pouring it into a preheated mold and then slowly cooling it.Additionally, a small amount of As2O3 may be added to prevent the glass from coloring and for defoaming, or a defoaming component that is well known in the industry. Addition of a small amount of does not affect the effect of the present invention.
又本発明の光学ガラスを用いたプレスレンズの形成は公
知の手段によって行ないつる。尚、本発明の光学ガラス
を用いたプレスレンズ形成では、該ガラスの屈伏温度が
低いため低温（３００〜４５０℃）で所望の形状にプレ
ス成形が可能である。Further, a press lens using the optical glass of the present invention can be formed by known means. In forming a press lens using the optical glass of the present invention, since the yield temperature of the glass is low, press molding into a desired shape is possible at a low temperature (300 to 450°C).
本発明において用いることのできる各成分に相当する原
料は特に制限を受けるものでなく、最終的な成分比が前
記の割合になるようなものであれば酸化物、水酸化物、
炭酸塩、硝酸塩、アルコキシド等いずれの形でも用いる
ことができる。例えば酸化リチウムに相当する原料とし
ては、炭酸ナトリウム等を挙げることができる。The raw materials corresponding to each component that can be used in the present invention are not particularly limited, and as long as the final component ratio is as described above, oxides, hydroxides,
It can be used in any form such as carbonate, nitrate, alkoxide, etc. For example, examples of raw materials corresponding to lithium oxide include sodium carbonate.
本発明の光学ガラスは好ましい構成によれば屈伏温度４
５０℃以下、屈折率１．５９５〜！、８５０、アツベ数
２０〜４５、ガラス転移点２８０〜４２０℃等の特性を
有するものである。すなわち、上記それぞれの特性値が
得られるよう成分比を２１整し製造する。According to a preferred configuration, the optical glass of the present invention has a yield temperature of 4
Below 50℃, refractive index 1.595~! , 850, an Abbé number of 20 to 45, and a glass transition point of 280 to 420°C. That is, the component ratio is adjusted to 21 in order to obtain the above-mentioned respective characteristic values.
［実施例］
表１に示す成分比から成る光学ガラスを作製し光学恒数
としてそれぞれの屈折率（ｎｄ） 、アツベ数（νｄ）
、ガラス転移点（Ｔｇ） 、及び屈伏温度（Ａｔ）を測
定し同表にまとめた。これより、本発明の成分比を有す
る光学ガラスはいずれも従来のＳＦ又はＦタイプと同等
の光学恒数を有し、かつガラス転移点、屈伏温度が比較
的低いことがわかる。又、液ガラスによるプレスレンズ
は低い温度でのプレス成形が可能であるため、ガラス表
面からの鉛の揮発による白濁もなく優れたものであった
。[Example] Optical glasses having the component ratios shown in Table 1 were prepared, and the respective refractive index (nd) and Atsube number (νd) were determined as optical constants.
, glass transition point (Tg), and yield temperature (At) were measured and summarized in the same table. From this, it can be seen that all optical glasses having the component ratio of the present invention have optical constants equivalent to those of the conventional SF or F type, and have relatively low glass transition points and yield temperatures. In addition, press lenses made of liquid glass can be press-molded at low temperatures, so they are excellent without clouding due to lead volatilization from the glass surface.
尚屈折率、アツベ数、ガラス転移点、屈伏温度はそれぞ
れ次の様にして測定したものである。The refractive index, Abbe's number, glass transition point, and yield temperature were measured as follows.
屈折率（ｎｄ） ニブυフリッヒ屈折計アツベ数（νｄ
）：ブリフリッヒ屈折計ガラス転移点（Ｔｇ） ：熱機
械分析装置（ＴＭＡ）屈伏温度（Ａｔ） ：熱機械分析
装置（ＴＭＡ）［発明の効果］
本発明によれば、鉛ガラスに所定量の酸化リチウムＬｉ
２Ｏを添加することにより屈伏温度（Ａｔ）が４５０℃
以下で、屈折率（ｎｄ）が１．５９５〜１．８５０、ア
ツベ数（νｄ）が２３〜４０の光学恒数を有し、失透に
対して安定で、極めて低い温度で錆密ブレスができ、プ
レス成形後研削または研摩を必要としないプレスレンズ
用光学ガラスが得られる効果がある。Refractive index (nd) Nib υ Frich refractometer Atsbe number (νd
): Bliflich refractometer Glass transition point (Tg): Thermomechanical analyzer (TMA) Destruction temperature (At): Thermomechanical analyzer (TMA) [Effects of the invention] According to the present invention, a predetermined amount of oxidation is applied to lead glass. Lithium Li
By adding 2O, yield temperature (At) is 450℃
It has optical constants with a refractive index (nd) of 1.595 to 1.850 and an Atsube number (νd) of 23 to 40, is stable against devitrification, and has a rust-tight brace at extremely low temperatures. This has the effect of providing an optical glass for press lenses that does not require grinding or polishing after press molding.
従って、各種プレスレンズ製造工程の簡略化、効率化を
大幅にはかることができる。Therefore, it is possible to greatly simplify and improve the efficiency of various press lens manufacturing processes.
Claims (1)
の割合で含有されている鉛ガラスから成ることを特徴と
するプレスレンズ用光学ガラス。 ２、次に示す成分比から成り、屈伏温度（Ａｔ）が４５
０℃以下、屈折率（ｎｄ）が１．５９５〜１．８５０、
アッベ数（νｄ）が２０〜４５である請求項１に記載の
プレスレンズ用光学ガラス。 ＳｉＯ＿２：１５−５０重量％、 ＰｂＯ：３５−８０重量％、 Ｌｉ＿２Ｏ：０．３−４０重量％、 Ｎａ＿２Ｏ＋Ｋ＿２Ｏ＋Ｌｉ＿２Ｏ：０．３−４０重量
％、Ｂ＿２Ｏ＿３：０−１０重量％。[Claims] 1. Lithium oxide (Li_2O) 0.3-40% by weight
An optical glass for press lenses characterized by comprising lead glass containing lead glass in a proportion of . 2. It consists of the following component ratios and has a yield temperature (At) of 45
0°C or less, refractive index (nd) of 1.595 to 1.850,
The optical glass for press lenses according to claim 1, having an Abbe number (vd) of 20 to 45. SiO_2: 15-50% by weight, PbO: 35-80% by weight, Li_2O: 0.3-40% by weight, Na_2O+K_2O+Li_2O: 0.3-40% by weight, B_2O_3: 0-10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18359989A JPH0350138A (en) | 1989-07-18 | 1989-07-18 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18359989A JPH0350138A (en) | 1989-07-18 | 1989-07-18 | Optical glass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0350138A true JPH0350138A (en) | 1991-03-04 |
Family
ID=16138632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18359989A Pending JPH0350138A (en) | 1989-07-18 | 1989-07-18 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0350138A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002211932A (en) * | 2000-11-17 | 2002-07-31 | Carl Zeiss Stiftung | Dissolving equipment for making high uv transmittable glass and method for the same |
| DE10202427A1 (en) * | 2002-01-22 | 2003-08-07 | Schott Glas | Glass used for optical applications contains a specified amount of lithium oxide and has specified refractive index and Abbe number |
| JP2010275187A (en) * | 2009-05-28 | 2010-12-09 | Schott Ag | Method for bending and thermal pre-prestressing of radiation shielding glass |
| DE112011104798T5 (en) | 2011-01-31 | 2013-12-19 | Suzuki Motor Corporation | Drive control device for hybrid vehicle |
| WO2014103936A1 (en) * | 2012-12-25 | 2014-07-03 | 日本電気硝子株式会社 | Glass for encapsulating semiconductor and sheath tube for encapsulating semiconductor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510590A (en) * | 1978-05-04 | 1980-01-25 | Wellcome Found | Enzyme immunity quantity analysis |
| JPS59224562A (en) * | 1983-03-15 | 1984-12-17 | ブ−ツ・セルテツク，ダイアグノステイツクスリミテツド | Method of verifying heterogeneous system union |
| JPS6230963A (en) * | 1985-05-07 | 1987-02-09 | リチヤ−ド、ザ−ラドニク | Delayed type solid-phase immunity testing method |
-
1989
- 1989-07-18 JP JP18359989A patent/JPH0350138A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510590A (en) * | 1978-05-04 | 1980-01-25 | Wellcome Found | Enzyme immunity quantity analysis |
| JPS59224562A (en) * | 1983-03-15 | 1984-12-17 | ブ−ツ・セルテツク，ダイアグノステイツクスリミテツド | Method of verifying heterogeneous system union |
| JPS6230963A (en) * | 1985-05-07 | 1987-02-09 | リチヤ−ド、ザ−ラドニク | Delayed type solid-phase immunity testing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002211932A (en) * | 2000-11-17 | 2002-07-31 | Carl Zeiss Stiftung | Dissolving equipment for making high uv transmittable glass and method for the same |
| DE10202427A1 (en) * | 2002-01-22 | 2003-08-07 | Schott Glas | Glass used for optical applications contains a specified amount of lithium oxide and has specified refractive index and Abbe number |
| JP2010275187A (en) * | 2009-05-28 | 2010-12-09 | Schott Ag | Method for bending and thermal pre-prestressing of radiation shielding glass |
| US8783065B2 (en) | 2009-05-28 | 2014-07-22 | Schott Ag | Method for bending and thermally prestressing radiation shielding glass |
| DE112011104798T5 (en) | 2011-01-31 | 2013-12-19 | Suzuki Motor Corporation | Drive control device for hybrid vehicle |
| WO2014103936A1 (en) * | 2012-12-25 | 2014-07-03 | 日本電気硝子株式会社 | Glass for encapsulating semiconductor and sheath tube for encapsulating semiconductor |
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