JP4412747B2 - Lead-free crown glass - Google Patents
Lead-free crown glass Download PDFInfo
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- JP4412747B2 JP4412747B2 JP31915697A JP31915697A JP4412747B2 JP 4412747 B2 JP4412747 B2 JP 4412747B2 JP 31915697 A JP31915697 A JP 31915697A JP 31915697 A JP31915697 A JP 31915697A JP 4412747 B2 JP4412747 B2 JP 4412747B2
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- 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
- C03C3/078—Glass compositions containing silica with 40% to 90% silica, by weight containing an oxide of a divalent metal, e.g. an oxide of zinc
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Description
【０００１】
【発明の属する技術分野】
本発明は、１．４９〜１．５４の屈折率ｎｄ及び５５〜６２のアッベ数νｄを有する無鉛クラウンガラスに関する。
【０００２】
【従来の技術】
近年、ガラス成分ＰｂＯ及びＡｓ２Ｏ３は環境汚染物として論議の的となっているため、光学機器の分野においては、ＰｂＯを含有せず、さらにまたＡｓ２Ｏ３を含有しないガラスを用いる傾向にある。従って、例えば屈折率、アッベ数、透過率などに関して特定の光学的性質を有するそのようなガラスが市場で入手可能とならねばならない。
しかし、単に酸化鉛を１つ又はそれ以上の他の成分で置換するだけでは、光学的性質及びガラス（技術上）の性質はＰｂＯの影響を受けるため、一般に、そのような全ての所望の特性を再現することは困難である。従って、殆どの場合、それに代って、ガラス組成についての新たな開発が必要となる。特許文献には既に、無鉛クラウンフリントガラス又はクラウンガラスが記載された種々の仕様が開示されている。しかしながら、これらのガラスは非常に広範な欠点を有する。
【０００３】
ドイツ特許明細書ＤＥ ９７３，３５０号には、鉛フリーであり得るが、屈折率を下げるために常にフッ素を含有するガラスが記載されている。このことは特開平１−１３３９５６号に記載のガラスについても当てはまる。前述した環境保護の観点については、この成分の使用も厳しく避けられるべきである。何故ならば、多くの状況下において、有害なフッ素の発散が溶解過程において生じ得るからである。
英国特許明細書ＧＢ ２，０２９，４０１Ｂ号に記載のガラスは２０重量％までのＣａＯを含有する。しかしながら、ＣａＯの導入、特に比較的多量に導入することによって、高温での粘度が低下するが、低温での粘度が増大する。すなわち、粘度／温度曲線がより急勾配になり、従ってＣａＯの添加によってより短時間にガラスを作製しなければならなくなる。
【０００４】
ヨーロッパ特許明細書ＥＰ ０，１５１，３４６Ｂ１号には、溶解温度を低下させるために高いＢ２Ｏ３含量が必要で、しかも所望の屈折率を得、ＵＶエッジを調整するために高いＴｉＯ２含量が必要なクラウンガラスが記載されており、またこのガラスはＡｓ２Ｏ３を含有しなければならない。ＴｉＯ２はＵＶ透過率を著しく減少させる。しかしながら、ＴｉＯ２は特に比較的多量の場合にガラスの望ましくない着色を生ずる。この高含量のＴｉＯ２により生ずる欠点は、８重量％までのＴｉＯ２を含有するドイツ特許出願公告ＤＥ−ＡＳ １，０５０，９６５号に記載のガラスの場合にも存在する。
【０００５】
ＥＰ ０，１５１，３４６Ｂ１号に記載のガラスの場合と同様に、Ａｌ２Ｏ３は特公平４−４０３０１号及び特公平４−７０２６２号に記載のクラウンガラスにおいても必須の成分である（それぞれ１０重量％まで及び１５重量％又は１４重量％）。このようなガラスは、高い失透傾向を示すことになる。
特開平６−１０７４２５号には、その光学的性質が広範囲にわたって変化し、また必須成分としてＢａＯ（４５重量％まで）及びＮｂ２Ｏ５（２５重量％まで）を含有するガラスが記載されている。この高価な成分Ｎｂ２Ｏ５を使用するため、混合物の価格が著しく高くなる。ガラスの低いＳｉＯ２含量は比較的高い割合のＢ２Ｏ３によって補償されるが、このことはガラスの耐薬品性がそれ程高くないことを意味する。
【０００６】
【発明が解決しようとする課題】
本発明の目的は、１．４９〜１．５４の屈折率ｎｄ及び５５〜６２のアッベ数νｄを有し、３８０〜７００ｎｍの波長範囲で高い光透過率を示し、また容易に溶解及び加工可能であり、しかもコスト的に有利に製造できる無鉛クラウンガラスを提供することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するために、本発明によれば、１．４９〜１．５４の屈折率ｎｄ及び５５〜６２のアッベ数νｄを有し、Ａｌ２Ｏ３を含有しない無鉛クラウンガラスが提供される。その一つの態様は、酸化物基準で以下の量的割合で以下の成分
ＳｉＯ２ ６５〜７０重量％、Ｂ２Ｏ３ ２〜６重量％、
Ｎａ２Ｏ ３〜８重量％、Ｋ２Ｏ ９〜１４重量％、
ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、
ＣａＯ １〜４重量％、
ＺｎＯ ７〜１１重量％（但し、７重量％を除く）、
ＴｉＯ２ ０〜＜１重量％、ＺｒＯ２ ０〜１重量％
を含有することを特徴としており、他の態様は、
ＳｉＯ２ ６６〜７０重量％、Ｂ２Ｏ３ ２〜５重量％、
Ｎａ２Ｏ ５〜８重量％、Ｋ２Ｏ １５〜１８重量％、
ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、
ＣａＯ ０〜１重量％、ＺｎＯ ４〜７重量％、
ＴｉＯ２ ０〜＜１重量％、ＺｒＯ２ ０〜１重量％
を含有することを特徴としている。本発明の無鉛クラウンガラスは、必要に応じて慣用量の清澄剤を含有することができる。
【０００８】
【発明の実施の形態】
本発明のガラスは、ＳｉＯ２が網状形成剤として機能するＳｉＯ２−Ｍ２Ｏ−ＺｎＯガラス系に属する。ＳｉＯ２は６５〜７０重量％の割合で存在する。しかしながら、それを２〜６重量％以下のＢ２Ｏ３で置換することができる。その結果、溶解温度が低下する。Ｂ２Ｏ３が高い割合の場合、耐薬品性が低下し、ガラス中に凝離が生じ易くなる。
溶解温度を下げるために、ガラスはＮａ２Ｏ及び／又はＫ２Ｏを含有し、また、溶解温度を充分に下げるためにこれらの２つの成分の合計量は少なくとも１２重量％であり、ガラスの高い耐薬品性が低下しないように最大２５重量％である。さらに、ガラスは各々２重量％以下の量でＬｉ２Ｏ及びＣｓ２Ｏを含有することができるが、その場合においてもアルカリ金属酸化物の合計量は２５重量％を超えるべきではない（Ｎａ２Ｏ＋Ｋ２Ｏ＋Ｌｉ２Ｏ＋Ｃｓ２Ｏ＝１２〜２５重量％）。
【０００９】
前記した光学的性質を獲得するために、ガラスは７〜１１重量％（但し、７重量％を除く）又は４〜７重量％のＺｎＯを含有する。望ましいデータの場合にＺｎＯ含量を低くするために、ガラスはＴｉＯ２（０〜＜１重量％）及びＺｒＯ２（０〜１重量％）も含有することができる。ＴｉＯ２含量が高くなるとＵＶ領域における透過損失となり、またＺｒＯ２含量が高くなると溶解温度が上昇する。好ましくは、ガラス中のＴｉＯ２とＺｒＯ２の合計量は少なくとも０．１重量％である。ガラスにとって少なくとも０．１重量％のＴｉＯ２を含有することが特に好ましい。これは、ＴｉＯ２はアッベ数に対してＺｎＯよりも著しい効果を有し、また著しく高いＺｎＯ含量は失透安定性を低下させるためである。
【００１０】
光学的品位の修正のために、３重量％以下のＮｂ２Ｏ５、３重量％以下のＴａ２Ｏ５及び３重量％以下のＷＯ３も本発明に係るガラスに添加できるが、これはこれらの成分が高価なために混合物のコストを引き上げることになる。
さらに、ガラスは５重量％未満のＣａＯを含有できる。この成分は耐薬品性及び加工性を有利に改善する。しかしながら、その割合が高くなると所望の光学特性が達成されなくなるという危険性がある。
さらにまた、ガラスは溶解特性及び加工特性を実質的に変えることなく各々３重量％以下のＢａＯ、ＳｒＯ及びＭｇＯも含有できる。しかしながら、少なくとも高い割合のＭｇＯはガラスの失透安定性を低下させるので、この成分は多くの場合削除される。
【００１１】
本発明のＡｌ２Ｏ３を含有しない無鉛クラウンガラスにおける組成範囲内には、それらの屈折率及びアッベ数により各々市販の鉛含有ガラス系に置き換わる２つの別個の好適なガラス組成領域がある。
一方では、これは酸化物基準でＳｉＯ２ ６５〜７０重量％、Ｂ２Ｏ３ ２〜６重量％、Ｎａ２Ｏ ３〜８重量％、Ｋ２Ｏ ９〜１４重量％、ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、ＣａＯ １〜４重量％、ＴｉＯ２ ０〜＜１重量％、ＺｎＯ ７〜１１重量％（但し、７重量％を除く）及びＺｒＯ２ ０〜１重量％の高ＣａＯ−高ＺｎＯ組成領域である。
他方では、これは酸化物基準でＳｉＯ２ ６６〜７０重量％、Ｂ２Ｏ３ ２〜５重量％、Ｎａ２Ｏ ５〜８重量％、Ｋ２Ｏ １５〜１８重量％、ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、ＣａＯ ０〜１重量％、ＴｉＯ２ ０〜＜１重量％、ＺｎＯ ４〜７重量％及びＺｒＯ２ ０〜１重量％の高Ｋ２Ｏ−低ＺｎＯ組成領域である。
【００１２】
ガラスの清澄化のためにそれ自体公知の清澄剤を混合物に添加することができる。Ａｓ２Ｏ３ではなく、それに代ってガラス品質を損うことなく加えることができる例えば硫酸塩、塩化物、Ｓｂ２Ｏ３又はＣｅＯ２が用いられれば、その場合、本発明に係る無鉛ガラスはさらにヒ素フリーでもある。
【００１３】
【発明の効果】
本発明に係る無鉛光学ガラスは、前述した所定の屈折率及びアッベ数を有するさらに他のグループのクラウンガラスを提供し、３８０〜７００ｎｍの波長範囲での高い透過率により特徴付けられる。このガラスは容易に溶解可能かつ加工可能であり、また低コストで製造することができ、しかも高い失透安定性と良好な耐薬品性を示す。
【００１４】
【実施例】
以下、実施例を示して本発明についてさらに具体的に説明するが、本発明が下記実施例に限定されないことはもとよりである。
実施例１〜６
本発明の６つの実施例のガラスを慣用の原料から溶解した。
それらの組成（酸化物基準の重量％表示）並びに屈折率ｎｄ及びアッベ数νｄを下記表１に示す。
【００１５】
【表１】
τｉ（４００ｎｍ，２５ｍｍ）＝０．９９１（実施例２）又は０．９９５（実施例６）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead-free crown glass having a refractive index n d of 1.49 to 1.54 and an Abbe number ν d of 55 to 62.
[0002]
[Prior art]
In recent years, since the glass components PbO and As 2 O 3 have become controversial as environmental pollutants, in the field of optical instruments, there is a tendency to use glass that does not contain PbO and also does not contain As 2 O 3. It is in. Therefore, such glasses having specific optical properties with respect to refractive index, Abbe number, transmittance, etc. must be available on the market.
However, simply replacing lead oxide with one or more other components generally affects the optical properties and glass (technical) properties of PbO, so in general all such desired properties. Is difficult to reproduce. In most cases, therefore, new developments in the glass composition are required instead. The patent literature already discloses various specifications describing lead-free crown flint glass or crown glass. However, these glasses have a very wide range of drawbacks.
[0003]
German patent specification DE 973,350 describes glasses that can be lead-free but always contain fluorine in order to reduce the refractive index. This is also true for the glass described in JP-A 1-133956. The use of this component should be strictly avoided with respect to the aforementioned environmental protection viewpoint. This is because, under many circumstances, harmful fluorine emissions can occur during the dissolution process.
The glass described in British patent specification GB 2,029,401B contains up to 20% by weight of CaO. However, the introduction of CaO, particularly a relatively large amount, reduces the viscosity at high temperature, but increases the viscosity at low temperature. That is, the viscosity / temperature curve is steeper and thus the glass must be made in a shorter time with the addition of CaO.
[0004]
European patent specification EP 0,151,346 B1 requires a high B 2 O 3 content in order to lower the melting temperature and yet has a high TiO 2 content in order to obtain the desired refractive index and to adjust the UV edge Is required, and this glass must contain As 2 O 3 . TiO 2 significantly reduces UV transmission. However, TiO 2 produces undesirable coloration of the glass, especially at relatively high amounts. The disadvantages caused by this high content of TiO 2 are also present in the case of the glasses described in DE-AS 1,050,965, which contains up to 8% by weight of TiO 2 .
[0005]
Similar to the case of the glass described in EP 0,151,346B1, Al 2 O 3 is an essential component in the crown glass described in JP-B-4-40301 and JP-B-4-70262 (each 10 Up to 15% and 15% or 14% by weight). Such glass will show a high tendency to devitrification.
JP-A-6-107425 describes a glass whose optical properties vary over a wide range and which contains BaO (up to 45% by weight) and Nb 2 O 5 (up to 25% by weight) as essential components. . Since this expensive component Nb 2 O 5 is used, the price of the mixture is significantly increased. The low SiO 2 content of the glass is compensated by a relatively high proportion of B 2 O 3 , which means that the chemical resistance of the glass is not so high.
[0006]
[Problems to be solved by the invention]
The object of the present invention is to have a refractive index n d of 1.49 to 1.54 and an Abbe number ν d of 55 to 62, exhibit high light transmittance in the wavelength range of 380 to 700 nm, and easily dissolve and It is an object of the present invention to provide a lead-free crown glass that can be processed and can be manufactured at a low cost.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a lead-free crown glass having a refractive index n d of 1.49 to 1.54 and an Abbe number ν d of 55 to 62 and not containing Al 2 O 3 is provided. Provided. One embodiment thereof includes the following components SiO 2 65 to 70% by weight, B 2 O 3 2 to 6% by weight in the following quantitative proportions based on oxides:
Na 2 O 3 to 8% by weight, K 2 O 9 to 14 wt%,
ΣNa 2 O + K 2 O 12-25% by weight,
CaO 1-4% by weight,
ZnO 7 to 11% by weight (excluding 7% by weight) ,
TiO 2 0 to <1 wt%, ZrO 2 0 to 1 wt%
The other aspect is characterized by containing
SiO 2 66-70% by weight, B 2 O 3 2 to 5 wt%,
Na 2 O 5-8 wt%, K 2 O 15-18 wt%,
ΣNa 2 O + K 2 O 12-25% by weight,
CaO 0 to 1 wt%, ZnO 4 to 7 wt%,
TiO 2 0 to <1 wt%, ZrO 2 0 to 1 wt%
It is characterized by containing. The lead-free crown glass of the present invention can contain a conventional amount of fining agent as required.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The glass of the present invention belongs to SiO 2 -M 2 O-ZnO glass system SiO 2 functions as a network former. SiO 2 is present in a proportion of 65 to 70% by weight. However, it can be replaced with 2 to 6% by weight or less of B 2 O 3 . As a result, the melting temperature decreases. When the proportion of B 2 O 3 is high, chemical resistance is lowered and segregation is likely to occur in the glass.
In order to lower the melting temperature, the glass contains Na 2 O and / or K 2 O, and in order to sufficiently lower the melting temperature, the total amount of these two components is at least 12% by weight, The maximum is 25% by weight so as not to deteriorate the high chemical resistance. In addition, the glass may contain Li 2 O and Cs 2 O in amounts of up to 2 % each, but in that case the total amount of alkali metal oxides should not exceed 25% by weight (Na 2 O + K 2 O + Li 2 O + Cs 2 O = 12-25 wt%).
[0009]
In order to obtain the optical properties described above, the glass contains 7 to 11 % by weight (except 7% by weight) or 4 to 7% by weight of ZnO. In order to lower the ZnO content in the case of the desired data, the glass can also contain TiO 2 (0 <1% by weight) and ZrO 2 (0-1% by weight). When the TiO 2 content is high, transmission loss occurs in the UV region, and when the ZrO 2 content is high, the melting temperature is increased. Preferably, the total amount of TiO 2 and ZrO 2 in the glass is at least 0.1% by weight. It is particularly preferred for the glass to contain at least 0.1% by weight of TiO 2 . This is because TiO 2 has a marked effect on the Abbe number over ZnO, and a significantly higher ZnO content reduces devitrification stability.
[0010]
For correction of optical quality, up to 3% by weight of Nb 2 O 5 , up to 3% by weight of Ta 2 O 5 and up to 3% by weight of WO 3 can also be added to the glass according to the invention. This increases the cost of the mixture because of the expensive ingredients.
Furthermore, the glass can contain less than 5% by weight of CaO. This component advantageously improves chemical resistance and processability. However, when the ratio becomes high, there is a risk that desired optical characteristics cannot be achieved.
Furthermore, the glass can also contain up to 3% by weight of BaO, SrO and MgO, respectively, without substantially changing the melting and processing properties. However, at least a high proportion of MgO reduces the devitrification stability of the glass, so this component is often omitted.
[0011]
Within the composition range in the lead-free crown glass containing no Al 2 O 3 of the present invention, there are two separate suitable glass composition regions that each replace commercial lead-containing glass systems by their refractive index and Abbe number.
On the one hand, this is SiO 2 65-70% by weight, B 2 O 3 2-6% by weight, Na 2 O 3-8% by weight, K 2 O 9-14% by weight, ΣNa 2 O + K 2 O based on oxides. 12 to 25 wt%, CaO 1 to 4 wt%, TiO 2 0 to <1 wt%, ZnO 7 to 11% by weight (excluding 7% by weight) and ZrO 2 0 to 1 wt% of high CaO- high It is a ZnO composition region.
On the other hand, this is SiO 2 66-70 wt%, B 2 O 3 2-5 wt%, Na 2 O 5-8 wt%, K 2 O 15-18 wt%, ΣNa 2 O + K 2 O, based on oxides. It is a high K 2 O-low ZnO composition region of 12 to 25% by weight, CaO 0 to 1% by weight, TiO 2 0 to <1% by weight, ZnO 4 to 7% by weight and ZrO 2 0 to 1% by weight.
[0012]
For clarification of the glass, fining agents known per se can be added to the mixture. If, for example, sulfate, chloride, Sb 2 O 3 or CeO 2 is used instead of As 2 O 3 and can be added without impairing the glass quality, then the lead-free glass according to the invention Is also arsenic-free.
[0013]
【The invention's effect】
The lead-free optical glass according to the present invention provides yet another group of crown glasses having the predetermined refractive index and Abbe number described above, and is characterized by a high transmittance in the wavelength range of 380 to 700 nm. This glass is easily meltable and processable, can be produced at low cost, and exhibits high devitrification stability and good chemical resistance.
[0014]
【Example】
EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated further more concretely, it cannot be overemphasized that this invention is not limited to the following Example.
Examples 1-6
Six example glasses of the present invention were melted from conventional raw materials.
Their composition (expressed in weight% based on oxide), refractive index n d and Abbe number ν d are shown in Table 1 below.
[0015]
[Table 1]
τ i (400 nm, 25 mm) = 0.991 (Example 2) or 0.995 (Example 6)
Claims (6)
ＳｉＯ２ ６５〜７０重量％、Ｂ２Ｏ３ ２〜６重量％、
Ｎａ２Ｏ ３〜８重量％、Ｋ２Ｏ ９〜１４重量％、
ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、
ＣａＯ １〜４重量％、
ＺｎＯ ７〜１１重量％（但し、７重量％を除く）、
ＴｉＯ２ ０〜＜１重量％、ＺｒＯ２ ０〜１重量％
を含有し、Ａｌ２Ｏ３を含有しないことを特徴とする１．４９〜１．５４の屈折率ｎｄ及び５５〜６２のアッベ数νｄを有する無鉛クラウンガラス。The following components in the following quantitative proportions based on oxide: 65 to 70% by weight of SiO 2 , 2 to 6% by weight of B 2 O 3 ,
Na 2 O 3 to 8% by weight, K 2 O 9 to 14% by weight,
ΣNa 2 O + K 2 O 12-25% by weight,
CaO 1-4% by weight,
ZnO 7 to 11% by weight (excluding 7% by weight) ,
TiO 2 0 to <1 wt%, ZrO 2 0 to 1 wt%
A lead-free crown glass having a refractive index n d of 1.49 to 1.54 and an Abbe number ν d of 55 to 62, characterized by not containing Al 2 O 3 .
ＳｉＯ２ ６６〜７０重量％、Ｂ２Ｏ３ ２〜５重量％、
Ｎａ２Ｏ ５〜８重量％、Ｋ２Ｏ １５〜１８重量％、
ΣＮａ２Ｏ＋Ｋ２Ｏ １２〜２５重量％、
ＣａＯ ０〜１重量％、ＺｎＯ ４〜７重量％、
ＴｉＯ２ ０〜＜１重量％、ＺｒＯ２ ０〜１重量％
を含有し、Ａｌ２Ｏ３を含有しないことを特徴とする１．４９〜１．５４の屈折率ｎｄ及び５５〜６２のアッベ数νｄを有する無鉛クラウンガラス。The following components in the following quantitative proportions based on oxide: 66 to 70% by weight of SiO 2 , 2 to 5% by weight of B 2 O 3 ,
Na 2 O 5-8 wt%, K 2 O 15-18 wt%,
ΣNa 2 O + K 2 O 12-25% by weight,
CaO 0 to 1 wt%, ZnO 4 to 7 wt%,
TiO 2 0 to <1 wt%, ZrO 2 0 to 1 wt%
A lead-free crown glass having a refractive index n d of 1.49 to 1.54 and an Abbe number ν d of 55 to 62, characterized by not containing Al 2 O 3 .
Ｌｉ２Ｏ ０〜２重量％、Ｃｓ２Ｏ ０〜２重量％、
ΣＮａ２Ｏ＋Ｋ２Ｏ＋Ｌｉ２Ｏ＋Ｃｓ２Ｏ ≦２５重量％、
ＭｇＯ ０〜３重量％、ＳｒＯ ０〜３重量％、
ＢａＯ ０〜３重量％、Ｎｂ２Ｏ５ ０〜３重量％、
Ｔａ２Ｏ５ ０〜３重量％、ＷＯ３ ０〜３重量％
を含有することを特徴とする請求項１乃至４のいずれか一項に記載のクラウンガラス。Furthermore, Li 2 O 0 to 2 wt%, Cs 2 O 0 to 2 wt%,
ΣNa 2 O + K 2 O + Li 2 O + Cs 2 O ≦ 25 wt%,
MgO 0 to 3 wt%, SrO 0 to 3 wt%,
BaO 0 to 3 wt%, Nb 2 O 5 0 to 3 wt%,
Ta 2 O 5 0~3 wt%, WO 3 0 to 3 wt%
The crown glass according to any one of claims 1 to 4, comprising:
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19650692.1 | 1996-12-06 | ||
| DE1996150692 DE19650692C2 (en) | 1996-12-06 | 1996-12-06 | Lead-free crown glasses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10167753A JPH10167753A (en) | 1998-06-23 |
| JP4412747B2 true JP4412747B2 (en) | 2010-02-10 |
Family
ID=7813862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31915697A Expired - Fee Related JP4412747B2 (en) | 1996-12-06 | 1997-11-06 | Lead-free crown glass |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP4412747B2 (en) |
| CN (1) | CN1269754C (en) |
| DE (1) | DE19650692C2 (en) |
| FR (1) | FR2756821B1 (en) |
| GB (1) | GB2320023B (en) |
| MY (1) | MY133265A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7329886B2 (en) | 1998-05-05 | 2008-02-12 | Carl Zeiss Smt Ag | EUV illumination system having a plurality of light sources for illuminating an optical element |
| DE19828992C1 (en) * | 1998-06-29 | 1999-10-07 | Schott Glas | Lead-free optical glass of barium light flint glass, barium crown glass, crown glass, crown flint glass or boron crown glass type |
| DE10031431B4 (en) * | 2000-06-28 | 2008-03-13 | Ivoclar Vivadent Ag | Deep-sintering potassium-zinc-silicate glass and its use |
| US6626986B2 (en) | 2000-06-28 | 2003-09-30 | Ivoclar Vivadent Ag | Low-temperature-sintering potassium-zinc-silicate glass |
| DE10031430A1 (en) * | 2000-06-28 | 2002-01-17 | Ivoclar Vivadent Ag | Deep-sintered apatite glass-ceramic |
| US6620747B2 (en) | 2000-06-28 | 2003-09-16 | Ivoclar Vivadent Ag | Low temperature-sintering apatite glass ceramic |
| DE10256629B3 (en) | 2002-12-03 | 2004-02-19 | Schott Glas | Optical glass for an optical element in imaging, projection, telecommunications, optical communication engineering and/or in laser technology comprises oxides of silicon, boron, aluminum, sodium and potassium |
| US7572746B2 (en) * | 2003-09-09 | 2009-08-11 | Kabushiki Kaisha Ohara | Optical glass |
| CN1982244B (en) * | 2005-12-16 | 2010-10-27 | 王瑛 | Health-care fluorescent-lamp tube glass against osteoporosis |
| DE102007044756A1 (en) | 2007-09-19 | 2009-04-09 | Robert Bosch Gmbh | Yaw moment adjusting method for e.g. car, involves calculating additional steering angle based on detection of pressure loss in tire, and reverting regulating or controlling device for calculation of angle on cause-effect relationships |
| CN105271724A (en) * | 2015-10-22 | 2016-01-27 | 成都光明光电股份有限公司 | Optical glass and optical element |
| WO2018139167A1 (en) * | 2017-01-25 | 2018-08-02 | 日本電気硝子株式会社 | Optical glass lens |
| JP7398185B2 (en) * | 2017-01-25 | 2023-12-14 | 日本電気硝子株式会社 | optical glass lens |
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| DE973350C (en) * | 1940-06-10 | 1960-01-28 | Jenaer Glaswerk Schott & Gen | Optical silicate glasses with a refractive index that is low in relation to the mean dispersion or the ª † value |
| BE551391A (en) * | 1956-09-10 | |||
| US3094423A (en) * | 1960-09-30 | 1963-06-18 | Bausch & Lomb | Neutral colored glass composition |
| BE757012A (en) * | 1969-10-03 | 1971-04-02 | Philips Nv | GLASS FOR CATHODIC RAY TUBES USED FOR THE REPRODUCTION OF TELEVISION IMAGES |
| GB1475500A (en) * | 1973-12-06 | 1977-06-01 | Pilkington Brothers Ltd | Ophthalmic glass compositions |
| US4012131A (en) * | 1975-08-20 | 1977-03-15 | American Optical Corporation | High strength ophthalmic lens |
| GB2029401B (en) * | 1979-08-16 | 1983-01-06 | Sumita Optical Glass Mfg Co Lt | Optical glass for optical paths |
| FR2558152B1 (en) * | 1984-01-13 | 1992-03-27 | Corning Glass Works | LOW DENSITY OPHTHALMIC LENSES, ABSORBING ULTRAVIOLET RADIATION AND HAVING HIGH TRANSMISSION INTO THE VISIBLE AND CORRECTIVE LENSES MADE OF SUCH LENSES |
| JPH01133956A (en) * | 1987-11-20 | 1989-05-26 | Canon Inc | Glass composition for distributed refractive index lens |
| JPH01201043A (en) * | 1988-02-05 | 1989-08-14 | Eta G K:Kk | High-strength glass |
| JPH01239036A (en) * | 1988-03-16 | 1989-09-25 | F G K:Kk | High-strength glass |
| JPH03183638A (en) * | 1989-12-11 | 1991-08-09 | Nippon Electric Glass Co Ltd | Glass for sealing stainless steel |
| JP2795326B2 (en) * | 1991-04-05 | 1998-09-10 | 株式会社オハラ | Optical glass |
| CZ278892B6 (en) * | 1991-05-08 | 1994-08-17 | Vysoka Skola Chem Tech | Lead-free crystal glass |
| ES2092707T3 (en) * | 1992-04-10 | 1996-12-01 | Schott Glaswerke | GLASS GLASS FREE OF LEAD AND NEIGHBORHOOD WITH HIGH LIGHT TRANSMISSION. |
| DE4303474C2 (en) * | 1992-04-10 | 1995-10-26 | Schott Glaswerke | Lead- and barium-free crystal glass with high light transmission |
| DE4309701C1 (en) * | 1993-03-25 | 1994-06-30 | Schott Glaswerke | Lead-free crystal glass having solarisation resistance |
| FR2713622B1 (en) * | 1993-12-10 | 1996-03-01 | Corning Vitro Corp | Glasses not containing lead and having the characteristics of crystal. |
| FR2728557A1 (en) * | 1994-12-27 | 1996-06-28 | Corning France | NEW LENSES AND OPHTHALMIC LENSES |
-
1996
- 1996-12-06 DE DE1996150692 patent/DE19650692C2/en not_active Expired - Fee Related
-
1997
- 1997-10-01 GB GB9720753A patent/GB2320023B/en not_active Expired - Fee Related
- 1997-10-22 FR FR9713208A patent/FR2756821B1/en not_active Expired - Fee Related
- 1997-10-27 MY MYPI9705065 patent/MY133265A/en unknown
- 1997-11-06 JP JP31915697A patent/JP4412747B2/en not_active Expired - Fee Related
- 1997-12-05 CN CN 97125359 patent/CN1269754C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19650692C2 (en) | 1999-01-14 |
| GB2320023B (en) | 2000-10-04 |
| GB2320023A (en) | 1998-06-10 |
| MY133265A (en) | 2007-10-31 |
| DE19650692A1 (en) | 1998-06-10 |
| JPH10167753A (en) | 1998-06-23 |
| CN1186051A (en) | 1998-07-01 |
| CN1269754C (en) | 2006-08-16 |
| GB9720753D0 (en) | 1997-12-03 |
| FR2756821A1 (en) | 1998-06-12 |
| FR2756821B1 (en) | 1999-12-10 |
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