JPH0432778B2 - - Google Patents
Info
- Publication number
- JPH0432778B2 JPH0432778B2 JP10756487A JP10756487A JPH0432778B2 JP H0432778 B2 JPH0432778 B2 JP H0432778B2 JP 10756487 A JP10756487 A JP 10756487A JP 10756487 A JP10756487 A JP 10756487A JP H0432778 B2 JPH0432778 B2 JP H0432778B2
- Authority
- JP
- Japan
- Prior art keywords
- refractive index
- glass
- melting point
- high refractive
- total amount
- 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
Links
- 239000011521 glass Substances 0.000 claims description 37
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 22
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 12
- 229910005793 GeO 2 Inorganic materials 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 229910052792 caesium Inorganic materials 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 229910052701 rubidium Inorganic materials 0.000 claims description 7
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 claims description 6
- KOPBYBDAPCDYFK-UHFFFAOYSA-N Cs2O Inorganic materials [O-2].[Cs+].[Cs+] KOPBYBDAPCDYFK-UHFFFAOYSA-N 0.000 claims description 2
- AKUNKIJLSDQFLS-UHFFFAOYSA-M dicesium;hydroxide Chemical compound [OH-].[Cs+].[Cs+] AKUNKIJLSDQFLS-UHFFFAOYSA-M 0.000 claims description 2
- 229910001953 rubidium(I) oxide Inorganic materials 0.000 claims description 2
- 238000004031 devitrification Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000005304 optical glass Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- -1 BaO Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000156 glass melt Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000002834 transmittance Methods 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
- C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
- C03C3/074—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc
Description
［産業上の利用分野］
本発明は高屈折率低融点ガラス用組成物に関す
る。本発明の高屈折率低融点ガラス用組成物は、
コンパクトデイスクプレーヤ用ピツクアツプレン
ズをダイレクトプレス法で製造する際に好適なガ
ラス組成物であり、またその他の各種光学ガラス
等の製造に利用可能である。
［従来の技術］
高屈折率低融点ガラスとして、米国特許第
4483931号明細書には、Bi2O3−PbO−Ga2O3系ガ
ラスが開示されており、この従来例のガラスは赤
外透過性にすぐれているという特長を有する。
［発明が解決しようとする問題点］
しかしながら上記従来例のガラスはその製造時
に失透し易く、大量生産が困難であるという欠点
があつた。
従つて本発明の目的は、高屈折率低融点ガラス
を安定に製造することができる組成物を提供する
ことにある。
［問題点を解決するための手段］
上記目的達成のために研究を積み重ねた結果、
網目構成酸化物ではB2O3、SiO2、GeO2が、また
二価金属酸化物ではBaO、SrO、CdOが、さらに
アルカリ金属酸化物ではCs2Oが、ガラスの耐失
透性を向上させるのに有効な成分であり、これら
の成分のうち、B2O3が時に有効な成分であるこ
とを見い出した。
そこでBi2O3−PbO−Ga2O3系ガラス組成物に
上記の耐失透性向上成分を含有させた各種ガラス
組成物について、その失透性の有無のみならず、
得られたガラスの屈折率及び融点をも測定し、耐
失透性、高屈折率及び低融点の三者を満足するガ
ラス組成物を追求した結果、下記の組成を有する
ガラス組成物が耐失透性、高屈折率及び低融点の
三者を満足することを見い出し、本発明を完成し
た。
本発明の高屈折率低融点ガラス用組成物は、重
量％で、
Bi2O3 10〜75％、
PbO 10〜75％、
但し、Bi2O3とPbOは合量で60〜95％、
Ga2O3 ２〜20％、
B2O3 １〜15％、
含有することを特徴とする。
本発明の高屈折率低融点ガラス用組成物におい
ては、上記成分に加えて、Li2O、Na2O、K2O、
Rb2O、Cs2O、MgO、CaO、SrO、BaO、CdO、
ZnO、La2O3、Y2O3、TiO2、ZrO2、Ta2O5、
Nb2O5、WO3、Al2O3、GeO2、SiO2及びTeO2の
群から選ばれた１種又は２種以上の酸化物を含有
させることができる。これら各酸化物の好ましい
量は次の通りである。
Li2O ０〜２％、
Na2O ０〜２％、
K2O ０〜２％、
Rb2O ０〜２％、
Cs2O ０〜５％、
但し、Li2OとNa2OとK2OとRb2OとCs2Oとは
合量で０〜５％、
MgO ０〜２％、
CaO ０〜５％、
SrO ０〜10％、
BaO ０〜30％、
CdO ０〜30％、
ZnO ０〜２％、
但し、MgOとCaOとSrOとBaOとCdOとZnO
とは合量で０〜30％、
La2O3とY2O3とTiO2とZrO2とTa2O5とNb2O5
とが合量で０〜20％、
WO3 ０〜10％、
Al2O3 ０〜２％、
GeO2 ０〜20％、
SiO2 ０〜10％、
但し、GeO2とSiO2は合量で０〜20％、
TeO2 ０〜20％。
上記組成を有する本発明の高屈折率低融点ガラ
ス用組成物のうち、下記の組成を有するものが特
に好ましい。
重量％で、
Bi2O3 30〜60％、
PbO 30〜60％、
但し、Bi2O3とPbOとは合量で75〜90％、
Ga2O3 ５〜10％、
B2O3 ２〜10％、
Li2OとNa2OとK2OとRb2OとCs2Oとが合量で
０〜２％、
MgO ０〜１％、
CaO ０〜１％、
SrO ０〜５％、
BaO ０〜10％、
CdO ０〜10％、
ZnO ０〜１％、
但し、MgOとCaOとSrOとBaOとCdOとZnO
とは合量で０〜10％、
La2O3とY2O3とTiO2とZrO2とTa2O5とNb2O5
とが合量で０〜１％、
WO3 ０〜５％、
Al2O3 ０〜１％、
GeO2 ０〜10％、
SiO2 ０〜５％、
但し、GeO2とSiO2とは合量で０〜10％、
TeO2 ０〜10％。
続いて、本発明の高屈折率低融点ガラス用組成
物を構成する各成分の組成限定理由について述べ
る。
先ず、Bi2O3及びPbOは、含有量が多いほど高
屈折率、低融点となり望ましいが、Bi2O3とPbO
のどちらか１方が10％を下まわるか、75％を上ま
わると、耐失透性が悪くなる。そこで、Bi2O3を
10〜75％（望ましくは、30〜60％）、PbOを10〜
75％（同、30〜60％）に限定した。さらにBi2O3
とPbOの合量が60％を下まわると目的とする上記
特性がえられず、また合量が95％を超えると耐失
透性が悪くなる。そこで、Bi2O3とPbOの合量を
60〜95％（同、75〜90％）に限定した。
次にGa2O3は２％を下まわると耐失透性が悪く
本発明の目的を達成できない。また20％を上まわ
るとガラスの融点が上昇しかつ屈折率が低下し目
的とするガラスが得られない。そこでGa2O3は２
〜20％（同、５〜10％）に限定した。
次に、B2O3はガラスを安定にし、失透温度を
下げる作用を有するが、１％を下まわると上記作
用が得られず、又15％を上まわると屈折率が低下
し、本発明の目的を達成できなくなる。そこで、
B2O3は１〜15％（同、２〜10％）に限定した。
次にLi2O、Na2O、K2O、Rb2O、Cs2Oは少量
添加で失透温度を下げ、融点を下げる作用を有す
るが、各成分の含有量が多すぎると、屈折率が下
がり、耐久性を損うため、
Li2Oを０〜２％、Na2Oを０〜２％、
K2Oを０〜２％、Rb2Oを０〜２％、
Cs2Oを０〜５％に限定し、Li2O、Na2O、K2O、
Rb2O、Cs2Oの合量を０〜５％（同、０〜２％）
に限定した。
次にMgO、CaO、SrO、BaO、ZnO、CdOは
少量の添加で屈折率をアルカリ成分ほど下げずに
失透温度を下げ、耐久性を向上させる作用を有す
るが、各含有量が多すぎては、融点が上昇し、耐
失透性も悪くなり本発明の目的を達成できない。
そこで、MgOを０〜２％（同、０〜１％）、CaO
を０〜５％（同、０〜１％）、SrOを０〜10％
（同、０〜５％）、BaOを０〜30％（同、０〜10
％）、ZnOを０〜２（同、０〜１％）、CdOを０〜
30％（同、０〜10％）に限定し、かつMgO、
CaO、SrO、BaO、ZnO、CdOの合量を０〜30％
（同、０〜10％）に限定した。
次に、Y2O3、La2O3、TiO2、ZrO2、Ta2O5、
Nb2O5は少量添加で耐久性を向上させる作用を有
するが、合量が２％を越すと耐失透性が悪化し、
融点を上げる。そこで、これらの成分の合量を０
〜２％（同、０〜１％）に限定した。
またWO3はY2O3、La2O3、TiO2、ZrO2、
Ta2O5、Nb2O5ほど融点を上げずに、耐久性を向
上させる作用を有するが、10％を越えると耐失透
性が悪くなる。そこでWO3を０〜10％（同、０
〜５％）に限定した。
次に、Al2O3は少量添加で耐久性を良くする作
用を有するが、２％を超えると耐失透性が悪化
し、熔解も困難となる。そこで、Al2O3を０〜２
％（同、０〜１％）に限定した。
GeO2及びSiO2はガラスの失透に対する安定性
を上げ、耐久性を向上させる作用を有するが、多
量では、屈折率が低下し融点が上昇するため、本
発明の目的を達成できない。そこで、
GeO2を０〜20％（同、０〜10％）、
SiO2を０〜10％（同、０〜５％）に限定し、
GeO2とSiO2の合量を０〜20％（同、０〜10％）
に限定した。
又、TeO2は屈折率を下げずに安定化作用を有
するが、20％を超えると上記作用が得られない。
そこでTeO2を０〜20％（同、０〜10％）に限定
した。
上記の組成範囲の各種酸化物から本発明の高屈
折率低融点ガラス用組成物が得られるが、ガラス
熔融バツチとして、上記酸化物に相当する炭酸
塩、硝酸塩、水酸化物、水和物などを用いること
ができることはもちろんである。
［実施例］
(1) 高屈折率低融点ガラスの製造
表１、表２、表３及び表４に示した組成にな
るように調合した原料を金または白金ルツボに
入れ、780〜900℃で熔融し、撹拌清澄した後、
鉄製型に流し込み、徐冷して各種高屈折率低融
点ガラスを得た。この方法によれば、失透のな
い均質なガラスを大量に製造することができる
ことが明らかとなつた。
(2) 高屈折率低融点ガラスの物性測定
得られた高屈折率低融点ガラスについて日本
光学硝子工業会規格に従つてガラス転移点
（Tg）、屈折率（nd）、液相温度（LT）を測定
した。測定結果は表１、表２、表３及び表４に
示した。
これらの表から明らかなように、本発明のガラ
スは、いずれも屈折率（nd）が2.0を超えており、
高屈折率である。また本発明のガラスはガラス転
移点（Tg）がいずれも400℃以下であり、ダイレ
クトプレスが充分可能なものである。さらに本発
明のガラスは従来技術として挙げた米国特許第
4483931号明細書に記載のガラスに対応する比較
例１〜５のガラスに比べ、液相温度がはるかに低
く、安定であつて耐失透性が向上していることが
明らかである。
[Industrial Application Field] The present invention relates to a composition for high refractive index, low melting point glass. The composition for high refractive index low melting point glass of the present invention is
It is a glass composition suitable for producing pick-up lenses for compact disc players by the direct press method, and can also be used for producing various other optical glasses. [Prior art] As a high refractive index low melting point glass, US Patent No.
No. 4,483,931 discloses a Bi 2 O 3 -PbO-Ga 2 O 3 glass, and this conventional glass is characterized by excellent infrared transmittance. [Problems to be Solved by the Invention] However, the above-mentioned conventional glasses tend to devitrify during manufacture, making mass production difficult. Therefore, an object of the present invention is to provide a composition that can stably produce a high refractive index, low melting point glass. [Means to solve the problem] As a result of repeated research to achieve the above objectives,
Network-constituting oxides such as B 2 O 3 , SiO 2 , and GeO 2 , divalent metal oxides such as BaO, SrO, and CdO, and alkali metal oxides such as Cs 2 O improve the devitrification resistance of glass. Among these components, B 2 O 3 has been found to be an effective component at times. Therefore, regarding various glass compositions in which the Bi 2 O 3 -PbO-Ga 2 O 3- based glass composition contains the above-mentioned devitrification resistance improving component, not only the presence or absence of devitrification property, but also the
The refractive index and melting point of the obtained glass were also measured, and as a result of the search for a glass composition that satisfied the three requirements of devitrification resistance, high refractive index, and low melting point, a glass composition with the following composition was found to be devitrification resistant. It was discovered that the three requirements of transparency, high refractive index, and low melting point were satisfied, and the present invention was completed. The composition for high refractive index, low melting point glass of the present invention contains Bi 2 O 3 10 to 75%, PbO 10 to 75% in weight percent, provided that Bi 2 O 3 and PbO are in a total amount of 60 to 95%, It is characterized by containing 2 to 20% of Ga 2 O 3 and 1 to 15% of B 2 O 3 . In addition to the above components, the composition for high refractive index, low melting point glass of the present invention contains Li 2 O, Na 2 O, K 2 O,
Rb2O , Cs2O , MgO, CaO, SrO, BaO, CdO,
ZnO, La 2 O 3 , Y 2 O 3 , TiO 2 , ZrO 2 , Ta 2 O 5 ,
One or more oxides selected from the group of Nb 2 O 5 , WO 3 , Al 2 O 3 , GeO 2 , SiO 2 and TeO 2 can be contained. Preferred amounts of each of these oxides are as follows. Li 2 O 0-2%, Na 2 O 0-2%, K 2 O 0-2%, Rb 2 O 0-2%, Cs 2 O 0-5%, however, Li 2 O and Na 2 O The total amount of K 2 O, Rb 2 O and Cs 2 O is 0-5%, MgO 0-2%, CaO 0-5%, SrO 0-10%, BaO 0-30%, CdO 0-30%. , ZnO 0-2%, however, MgO, CaO, SrO, BaO, CdO, and ZnO
is 0 to 30% in total, La 2 O 3 , Y 2 O 3 , TiO 2 , ZrO 2 , Ta 2 O 5 and Nb 2 O 5
0 to 20% in total, WO 3 0 to 10%, Al 2 O 3 0 to 2%, GeO 2 0 to 20%, SiO 2 0 to 10%, however, GeO 2 and SiO 2 are in total 0-20%, TeO 2 0-20%. Among the high refractive index, low melting point glass compositions of the present invention having the above compositions, those having the following compositions are particularly preferred. By weight, Bi 2 O 3 30-60%, PbO 30-60%, however, the total amount of Bi 2 O 3 and PbO is 75-90%, Ga 2 O 3 5-10%, B 2 O 3 2-10%, Li 2 O, Na 2 O, K 2 O, Rb 2 O and Cs 2 O in total amount 0-2%, MgO 0-1%, CaO 0-1%, SrO 0-5 %, BaO 0-10%, CdO 0-10%, ZnO 0-1%, however, MgO, CaO, SrO, BaO, CdO, and ZnO
is 0 to 10% in total, La 2 O 3 , Y 2 O 3 , TiO 2 , ZrO 2 , Ta 2 O 5 , and Nb 2 O 5
0 to 1% in total, WO 3 0 to 5%, Al 2 O 3 0 to 1%, GeO 2 0 to 10%, SiO 2 0 to 5%, however, GeO 2 and SiO 2 are 0-10% in amount, TeO 2 0-10%. Next, the reason for limiting the composition of each component constituting the high refractive index, low melting point glass composition of the present invention will be described. First, the higher the content of Bi 2 O 3 and PbO, the higher the refractive index and the lower the melting point, which is desirable.
If either one of them falls below 10% or exceeds 75%, the devitrification resistance will deteriorate. Therefore, Bi 2 O 3
10~75% (preferably 30~60%), PbO 10~
75% (30-60%). Furthermore Bi 2 O 3
If the total amount of PbO and PbO is less than 60%, the desired properties cannot be obtained, and if the total amount exceeds 95%, the devitrification resistance will deteriorate. Therefore, the total amount of Bi 2 O 3 and PbO is
It was limited to 60-95% (same as 75-90%). Next, if Ga 2 O 3 is less than 2%, devitrification resistance is poor and the object of the present invention cannot be achieved. Moreover, if it exceeds 20%, the melting point of the glass increases and the refractive index decreases, making it impossible to obtain the desired glass. So Ga 2 O 3 is 2
~20% (same as 5-10%). Next, B 2 O 3 has the effect of stabilizing the glass and lowering the devitrification temperature, but if it is less than 1%, the above effect cannot be obtained, and if it exceeds 15%, the refractive index decreases, and the main effect is The purpose of the invention cannot be achieved. Therefore,
B 2 O 3 was limited to 1 to 15% (same as 2 to 10%). Next, Li 2 O, Na 2 O, K 2 O, Rb 2 O, and Cs 2 O have the effect of lowering the devitrification temperature and melting point when added in small amounts, but if the content of each component is too large, the refractive Li 2 O 0-2%, Na 2 O 0-2%, K 2 O 0-2%, Rb 2 O 0-2%, Cs 2 O is limited to 0 to 5%, Li 2 O, Na 2 O, K 2 O,
The total amount of Rb 2 O and Cs 2 O is 0 to 5% (same, 0 to 2%)
limited to. Next, when added in small amounts, MgO, CaO, SrO, BaO, ZnO, and CdO have the effect of lowering the devitrification temperature and improving durability without lowering the refractive index as much as alkaline components. The purpose of the present invention cannot be achieved because the melting point increases and the devitrification resistance deteriorates.
Therefore, we added 0 to 2% MgO (same, 0 to 1%), CaO
0-5% (same, 0-1%), SrO 0-10%
(same, 0-5%), BaO 0-30% (same, 0-10
%), ZnO 0-2 (same, 0-1%), CdO 0-2
30% (same, 0-10%), and MgO,
Total amount of CaO, SrO, BaO, ZnO, CdO from 0 to 30%
(same, 0-10%). Next, Y 2 O 3 , La 2 O 3 , TiO 2 , ZrO 2 , Ta 2 O 5 ,
Nb 2 O 5 has the effect of improving durability when added in small amounts, but when the total amount exceeds 2%, devitrification resistance deteriorates.
Raise the melting point. Therefore, the total amount of these components is set to 0.
-2% (same as 0-1%). Moreover, WO 3 is Y 2 O 3 , La 2 O 3 , TiO 2 , ZrO 2 ,
It has the effect of improving durability without raising the melting point as much as Ta 2 O 5 and Nb 2 O 5 , but if it exceeds 10%, devitrification resistance deteriorates. Therefore, WO 3 was added at 0 to 10% (same, 0
~5%). Next, Al 2 O 3 has the effect of improving durability when added in a small amount, but if it exceeds 2%, devitrification resistance deteriorates and melting becomes difficult. Therefore, Al 2 O 3 is 0 to 2
% (same, 0-1%). Although GeO 2 and SiO 2 have the effect of increasing the stability against devitrification of glass and improving its durability, in large amounts, the refractive index decreases and the melting point increases, so that the object of the present invention cannot be achieved. Therefore, we limited GeO 2 to 0 to 20% (same, 0 to 10%) and SiO 2 to 0 to 10% (same, 0 to 5%),
Total amount of GeO 2 and SiO 2 from 0 to 20% (same, 0 to 10%)
limited to. Further, TeO 2 has a stabilizing effect without lowering the refractive index, but if it exceeds 20%, the above effect cannot be obtained.
Therefore, TeO 2 was limited to 0 to 20% (same as 0 to 10%). The composition for high refractive index, low melting point glass of the present invention can be obtained from various oxides in the above composition range, but as a glass melt batch, carbonates, nitrates, hydroxides, hydrates, etc. corresponding to the above oxides can be obtained. Of course, it is possible to use [Example] (1) Production of high refractive index low melting point glass The raw materials prepared to have the compositions shown in Tables 1, 2, 3 and 4 were placed in a gold or platinum crucible and heated at 780 to 900°C. After melting, stirring and clarifying,
The mixture was poured into iron molds and slowly cooled to obtain various types of high refractive index and low melting point glasses. According to this method, it has become clear that homogeneous glass without devitrification can be produced in large quantities. (2) Measurement of physical properties of high refractive index, low melting point glass The glass transition point (Tg), refractive index (nd), and liquidus temperature (LT) of the obtained high refractive index, low melting point glass were measured according to the Japan Optical Glass Industry Association standards. was measured. The measurement results are shown in Table 1, Table 2, Table 3 and Table 4. As is clear from these tables, all of the glasses of the present invention have a refractive index (nd) of over 2.0,
It has a high refractive index. Furthermore, the glasses of the present invention all have a glass transition point (Tg) of 400° C. or lower, and are fully capable of being directly pressed. Furthermore, the glass of the present invention is disclosed in the US patent cited as prior art.
It is clear that the liquidus temperature is much lower, the glass is stable, and the devitrification resistance is improved compared to the glasses of Comparative Examples 1 to 5, which correspond to the glass described in No. 4483931.
【表】【table】
【表】【table】
【表】【table】
【表】
［発明の効果］
以上述べたように、本発明によれば、高屈折率
かつ低融点であり、かつ均質で失透のないガラス
を大量に製造することが可能になつた。またダイ
レクトプレスによるレンズの製造が可能になり、
高屈折率の光学ガラスとして種々の光学製品への
使用が可能となる等その実用的価値は多大であ
る。[Table] [Effects of the Invention] As described above, according to the present invention, it has become possible to mass-produce glass that has a high refractive index and a low melting point, is homogeneous, and is free from devitrification. It also became possible to manufacture lenses by direct pressing,
Its practical value is great, as it can be used in various optical products as an optical glass with a high refractive index.
Claims (1)
用組成物。 ２ 上記成分に加えて、Li2O、Na2O、K2O、
Rb2O、Cs2O、MgO、CaO、SrO、BaO、CdO、
ZnO、La2O3、Y2O3、TiO2、ZrO2、Ta2O5、
Nb2O5、WO3、Al2O3、GeO2、SiO2及びTeO2の
群から選ばれた１種又は２種以上の酸化物を含有
することを特徴とする特許請求の範囲第１項記載
の高屈折率低融点ガラス用組成物。 ３ 重量％で、 Li2O ０〜２％、 Na2O ０〜２％、 K2O ０〜２％、 Rb2O ０〜２％、 Cs2O ０〜５％、 但し、Li2OとNa2OとK2OとRb2OとCs2Oとは
合量で０〜５％、 MgO ０〜２％、 CaO ０〜５％、 SrO ０〜10％、 BaO ０〜30％、 CdO ０〜30％、 ZnO ０〜２％、 但し、MgOとCaOとSrOとBaOとCdOとZnO
とは合量で０〜30％、 La2O3とY2O3とTiO2と
ZrO2とTa2O5とNb2O5とが合量で０〜２％、 WO3 ０〜10％、 Al2O3 ０〜２％、 GeO2 ０〜20％、 SiO2 ０〜10％、 但し、GeO2とSiO2とは合量で０〜20％、 TeO2 ０〜20％ 含有することを特徴とする特許請求の範囲第１項
記載の高屈折率低融点ガラス用組成物。[Claims] 1% by weight: Bi 2 O 3 10-75%, PbO 10-75%, provided that the total amount of Bi 2 O 3 and PbO is 60-95%, Ga 2 O 3 2-20% , 1 to 15% of B 2 O 3 . A composition for high refractive index, low melting point glass. 2 In addition to the above components, Li 2 O, Na 2 O, K 2 O,
Rb2O , Cs2O , MgO, CaO, SrO, BaO, CdO,
ZnO, La 2 O 3 , Y 2 O 3 , TiO 2 , ZrO 2 , Ta 2 O 5 ,
Claim 1, characterized in that it contains one or more oxides selected from the group of Nb 2 O 5 , WO 3 , Al 2 O 3 , GeO 2 , SiO 2 and TeO 2 A composition for high refractive index, low melting point glass as described in 1. 3% by weight, Li 2 O 0-2%, Na 2 O 0-2%, K 2 O 0-2%, Rb 2 O 0-2%, Cs 2 O 0-5%, however, Li 2 O The total amount of Na 2 O, K 2 O, Rb 2 O and Cs 2 O is 0-5%, MgO 0-2%, CaO 0-5%, SrO 0-10%, BaO 0-30%, CdO 0-30%, ZnO 0-2%, however, MgO, CaO, SrO, BaO, CdO, and ZnO
is 0 to 30% in total, La 2 O 3 , Y 2 O 3 , TiO 2 and
Total amount of ZrO 2 , Ta 2 O 5 and Nb 2 O 5 is 0-2%, WO 3 0-10%, Al 2 O 3 0-2%, GeO 2 0-20%, SiO 2 0-10 %, provided that the total amount of GeO 2 and SiO 2 is 0 to 20% and TeO 2 is 0 to 20%. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10756487A JPS63274638A (en) | 1987-04-30 | 1987-04-30 | Composition for high refractive index low melting point glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10756487A JPS63274638A (en) | 1987-04-30 | 1987-04-30 | Composition for high refractive index low melting point glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63274638A JPS63274638A (en) | 1988-11-11 |
| JPH0432778B2 true JPH0432778B2 (en) | 1992-06-01 |
Family
ID=14462367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10756487A Granted JPS63274638A (en) | 1987-04-30 | 1987-04-30 | Composition for high refractive index low melting point glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63274638A (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002034683A1 (en) | 2000-10-23 | 2002-05-02 | Asahi Glass Company, Limited | Glass for press molding and lens |
| AU2002343344A1 (en) * | 2001-09-10 | 2003-03-24 | Schott Glas | Bismuth oxide-containing glass comprising lanthanum oxide |
| US7282713B2 (en) * | 2004-06-10 | 2007-10-16 | General Electric Company | Compositions and methods for scintillator arrays |
| JP5313440B2 (en) * | 2005-09-06 | 2013-10-09 | 株式会社オハラ | Optical glass |
| JP4429295B2 (en) * | 2005-09-06 | 2010-03-10 | 株式会社オハラ | Optical glass |
| JP4590386B2 (en) * | 2006-10-23 | 2010-12-01 | 株式会社オハラ | Optical glass |
| JP2008266031A (en) * | 2007-04-16 | 2008-11-06 | Ohara Inc | Method for producing optical glass |
| JP5650371B2 (en) * | 2008-04-29 | 2015-01-07 | 株式会社オハラ | Optical glass |
| JP2009280429A (en) * | 2008-05-21 | 2009-12-03 | Isuzu Seiko Glass Kk | Optical glass |
| CN101913768B (en) * | 2010-08-20 | 2012-11-21 | 中国建筑材料科学研究总院 | Hydroxyl-removal and no-devitrification multispectral transmission barium-gallium-germanium glass |
| US8846555B2 (en) * | 2012-06-25 | 2014-09-30 | Schott Corporation | Silica and fluoride doped heavy metal oxide glasses for visible to mid-wave infrared radiation transmitting optics and preparation thereof |
| RU2760890C1 (en) * | 2020-12-22 | 2021-12-01 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") | Highly refractive glass |
| EP4129942A1 (en) | 2021-08-03 | 2023-02-08 | Corning Incorporated | Borate and silicoborate optical glasses with high refractive index and low liquidus temperature |
| NL2029053B1 (en) | 2021-08-03 | 2023-02-17 | Corning Inc | Borate and Silicoborate Optical Glasses with High Refractive Index and Low Liquidus Temperature |
-
1987
- 1987-04-30 JP JP10756487A patent/JPS63274638A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63274638A (en) | 1988-11-11 |
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