JPS6335579B2 - - Google Patents
Info
- Publication number
- JPS6335579B2 JPS6335579B2 JP58021637A JP2163783A JPS6335579B2 JP S6335579 B2 JPS6335579 B2 JP S6335579B2 JP 58021637 A JP58021637 A JP 58021637A JP 2163783 A JP2163783 A JP 2163783A JP S6335579 B2 JPS6335579 B2 JP S6335579B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- specific gravity
- refractive index
- weight
- exceeds
- 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
- 239000000203 mixture Substances 0.000 claims description 7
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 239000005304 optical glass Substances 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000011521 glass Substances 0.000 description 18
- 230000005484 gravity Effects 0.000 description 17
- 238000005191 phase separation Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 1
- 229910002637 Pr6O11 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000004305 hyperopia Effects 0.000 description 1
- 201000006318 hyperopia Diseases 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004379 myopia Effects 0.000 description 1
- 208000001491 myopia Diseases 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/10—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels to produce uniformly-coloured transparent products
-
- 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
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
-
- 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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
-
- 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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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)
- Eyeglasses (AREA)
Description
［産業上の利用分野］
本発明は光学ガラス、特に屈折率が1.59以上
で、アツベ数が36以上であり、しかも比重が2.6
以下である光学ガラスに関する。このように屈折
率が大きいわりには、比重が小さくアツベ数の大
きいガラスは、眼鏡レンズ用ガラスに最適であ
る。
［従来の技術］
眼鏡レンズの矯正率は、使用するレンズの屈折
率と両面の曲率に依存するが、度の進んだ近視ま
たは遠視を矯正するためのレンズは、周辺部また
は中心部が厚くなるので、美観をそこなうばかり
でなく重量も増して、使用者に不快感を与えてい
る。従来、この問題の解決をめざして、比較的低
比重で屈折率の高い眼鏡レンズ用ガラスが提案さ
れており、例えば特開昭49−87716号公報および
特公昭54−2645号公報によれば±３以上のジオプ
トリー値を有する眼鏡レンズでは、その軽量化を
はかることができる。
［発明が解決しようとする問題点］
しかしながら、±３以下のジオプトリー値の必
要な場合には、上記の公知技術での比重3.0付近
のガラスを用いても軽量化は期待できなかつた。
また、低比重で、比較的高い屈折率を持つガラス
ではアツベ数がどうしても小さくなり、眼鏡用レ
ンズとして用いた場合、レンズ周辺部を通して像
を見るときに、像の周辺部に色収差による色のニ
ジミがみられるようになる。特に、黄色光のニジ
ミが鋭敏に感じられ、極端な場合には、これによ
つてレンズの矯正視力を30％も低下させていた。
本発明の主な目的は、このような低いジオプト
リー値の領域をまかなう、薄くて軽い眼鏡レンズ
を製造することが可能なガラスを提案することで
あつて、既存の普通の眼鏡用ガラスと同程度の低
比重でありながら、高い屈折率をもつガラスを提
供することにある。
本発明の別の目的は、ガラスに高いアツベ数を
もたせることにより、レンズ周辺の色収差を少な
くした眼鏡レンズ用素材を提供することにある。
［問題点を解決するための手段］
上記目的を達成するため、本発明は次のような
ガラス組成としたものである。すなわち、光学ガ
ラスの組成範囲を重量百分率で示すと、次の通り
である。
SiO2 56〜67重量％
B2O3 0（０を含まない）〜 7
Al2O3 0〜 5
Na2O 0〜11
K2O 10.8〜15
Li2O 0（０を含まない）〜 7
Na2O＋K2O＋Li2O 11〜18
TiO2 12〜19
MgO＋CaO＋SrO＋ZnO 0〜 4
La2O3＋ZrO2＋Nb2O5 0〜 2
上記組成範囲で、アツベ数を高めるには、
TiO2を減少させればよいが、あまり少なくする
と必要な比重と屈折率が得られなくなる。この必
要な屈折率ndと比重Ｓｇをもち、アツベ数νdを
高めるには、K2Oを増量すれば良いことが見出さ
れた。K2Oの量は10.8〜15重量％が最も望まし
い。またK2Oはコーテイングに対しても好結果を
もつので有用である。
SiO2はガラス形成酸化物として用いられるが、
67％以上ではガラスが難溶になるばかりでなく不
安定となり失透し易い。56％以下では比重が大き
くなる。B2O3は比重を小さくし、アツベ数を高
くする効果のほかに溶融を容易にするが、７％以
上では強い分相傾向を示す。Al2O3は、ガラスの
安定化のために必要であるが、５％以上では強い
分相傾向を示す。
Na2O、K2OおよびLi2Oのアルカリ金属酸化物
は、ガラスの溶融を容易にし、さらにガラスの分
相傾向を抑え、安定化のために必要な成分であ
る。しかし、その和が18％を超えると比重が大き
くなり、化学的耐久性も劣化して、眼鏡用として
は使用に耐えなくなる。また、その和が11％以下
では強い分相傾向を示す。これらの三成分のう
ち、Na2Oが11％以上になると化学的耐久性が劣
化する。K2Oは多くなると徐々に化学的耐久性が
劣化するが、15％以下ならばNa2O11％以下と同
等であり実用できる。一方、着色を押えアツベ数
を高めるというK2Oの効果を発揮させるには、
10.8％以上必要であり、総合的にはK2Oは、10.8
〜15％の範囲が最も望ましい。
Li2Oは屈折率を高め、比重を小さくするのに
有効な成分である。７％以上では強い結晶化傾向
を示し、また、原料価格が高くなるので、７％以
上用いることは望ましくない。
TiO2は、最も高い屈折率と小さい比重をもた
らすための不可欠成分であるが、19％以上ではア
ツベ数を小さくし、また必要な比重も得られな
い。12％以下では必要な屈折率が得られない。２
価成分酸化物は、光学恒数調整のため使用できる
が、アルカリ金属酸化物にくらべてMgO以外は
比重を大きくするので、その合量が４％以上では
必要な比重が得られないし、MgOが４％以上で
は強い分相傾向を示す。
また、アツベ数の調整のため少量のLa2O3、
ZrO2、Nb2O5でTiO2の一部を置換することも可
能であるが、その含有量が２％以上では必要な比
重が得られない。
その他の成分として、まず、Ta2O5、Y2O3、
Gd2O3も光学恒数調整のため少量添加することも
可能である。TiO2の着色（黄色）を消去する場
合には、Co2O3を上記の組成100重量部に対して
0.5〜3ppmを添加すればよい。像の周辺部の色収
差によるニジミに対しては、視感度の高い黄色光
のニジミを消去し、また可視光域全般に適正な透
光性を保持する場合には、上記の基礎組成100重
量部に対してNd2O30.1〜１重量部を添加すれば
よい。さらにPr6O11を０〜0.3％加えると、好ま
しい青色調を得ることができる。また、ガラスの
清澄のためにAs2O3、Sb2O3を用いてもよい。
次に本発明のガラスの実施例を表にて示す。
[Industrial Application Field] The present invention relates to optical glasses, particularly those having a refractive index of 1.59 or more, an Atsube number of 36 or more, and a specific gravity of 2.6.
The following relates to optical glass. In this way, a glass having a high refractive index but a low specific gravity and a high Atbe's number is optimal for glass for eyeglass lenses. [Prior Art] The correcting rate of eyeglass lenses depends on the refractive index of the lens used and the curvature of both surfaces, but lenses for correcting advanced myopia or farsightedness are thicker at the periphery or center. Therefore, not only does the aesthetic appearance deteriorate, but the weight also increases, causing discomfort to the user. In the past, aiming to solve this problem, glasses for eyeglass lenses with relatively low specific gravity and high refractive index have been proposed. Eyeglass lenses having a diopter value of 3 or more can be made lighter. [Problems to be Solved by the Invention] However, when a diopter value of ±3 or less is required, weight reduction could not be expected even if the above-mentioned known technology uses glass with a specific gravity around 3.0.
In addition, glass with low specific gravity and a relatively high refractive index inevitably has a small Atsube number, and when used as a lens for spectacles, when viewing an image through the periphery of the lens, color blurring due to chromatic aberration may occur at the periphery of the image. becomes visible. In particular, yellow light blurring was felt more acutely, and in extreme cases, this could reduce corrected visual acuity by as much as 30%. The main purpose of the present invention is to propose a glass that can cover such a low diopter value region and make it possible to manufacture a thin and light eyeglass lens, which is comparable to existing ordinary eyeglass glasses. The objective is to provide a glass that has a high refractive index while having a low specific gravity. Another object of the present invention is to provide a material for eyeglass lenses that reduces chromatic aberration around the lens by providing glass with a high Abbe's number. [Means for Solving the Problems] In order to achieve the above object, the present invention has the following glass composition. That is, the composition range of the optical glass expressed in weight percentage is as follows. SiO 2 56~67% by weight B 2 O 3 0 (not including 0) ~ 7 Al 2 O 3 0 ~ 5 Na 2 O 0 ~ 11 K 2 O 10.8 ~ 15 Li 2 O 0 (not including 0) ~ 7 Na 2 O + K 2 O + Li 2 O 11 - 18 TiO 2 12 - 19 MgO + CaO + SrO + ZnO 0 - 4 La 2 O 3 + ZrO 2 + Nb 2 O 5 0 - 2 In order to increase the Atsube number in the above composition range,
It is possible to reduce TiO 2 , but if it is reduced too much, the required specific gravity and refractive index cannot be obtained. It has been found that in order to have the necessary refractive index nd and specific gravity Sg and to increase the Atsube number νd, it is sufficient to increase the amount of K 2 O. Most preferably, the amount of K2O is between 10.8 and 15% by weight. K 2 O is also useful for coating as it has good results. SiO 2 is used as a glass-forming oxide,
If it exceeds 67%, the glass not only becomes difficult to melt, but also becomes unstable and tends to devitrify. Below 56%, the specific gravity increases. B 2 O 3 has the effect of lowering the specific gravity and increasing the Abbe number, and also facilitates melting, but if it exceeds 7%, it exhibits a strong tendency to phase separation. Al 2 O 3 is necessary for stabilizing the glass, but if it exceeds 5%, it exhibits a strong tendency to phase separation. Alkali metal oxides such as Na 2 O, K 2 O, and Li 2 O are necessary components for facilitating the melting of the glass, suppressing the phase separation tendency of the glass, and stabilizing the glass. However, if the sum exceeds 18%, the specific gravity increases and the chemical durability deteriorates, making it unusable for eyeglasses. Moreover, when the sum is 11% or less, a strong tendency for phase separation is exhibited. Among these three components, when Na 2 O exceeds 11%, chemical durability deteriorates. As K 2 O increases, chemical durability gradually deteriorates, but if it is 15% or less, it is equivalent to Na 2 O 11% or less and can be put to practical use. On the other hand, in order to demonstrate the effect of K 2 O, which suppresses coloration and increases the number of spots,
10.8% or more is required, and overall K2O is 10.8% or more.
A range of ~15% is most desirable. Li 2 O is an effective component for increasing the refractive index and decreasing the specific gravity. It is not desirable to use more than 7% since a strong crystallization tendency is exhibited and the cost of the raw material becomes high. TiO 2 is an essential component to provide the highest refractive index and low specific gravity, but if it exceeds 19%, the Atsube number will be small and the necessary specific gravity will not be obtained. If it is less than 12%, the necessary refractive index cannot be obtained. 2
Value component oxides can be used to adjust the optical constants, but since they increase the specific gravity of all components other than MgO compared to alkali metal oxides, if the total amount exceeds 4%, the required specific gravity cannot be obtained, and MgO At 4% or more, a strong tendency for phase separation is exhibited. In addition, a small amount of La 2 O 3 was added to adjust the Atsube number.
It is also possible to partially replace TiO 2 with ZrO 2 or Nb 2 O 5 , but if the content is 2% or more, the required specific gravity cannot be obtained. Other components include Ta 2 O 5 , Y 2 O 3 ,
It is also possible to add a small amount of Gd 2 O 3 to adjust the optical constants. To erase the coloration (yellow) of TiO 2 , add Co 2 O 3 to 100 parts by weight of the above composition.
It is sufficient to add 0.5 to 3 ppm. For blurring caused by chromatic aberration in the peripheral area of the image, if you want to eliminate blurring in yellow light, which has high visual sensitivity, and maintain appropriate translucency in the entire visible light range, use 100 parts by weight of the above basic composition. 0.1 to 1 part by weight of Nd 2 O 3 may be added. Further, by adding 0 to 0.3% of Pr6O11 , a preferable blue tone can be obtained. Furthermore, As 2 O 3 and Sb 2 O 3 may be used to refine the glass. Next, examples of the glasses of the present invention are shown in a table.
【表】【table】
【表】
これらのガラスは、珪石粉、水酸化アルミニウ
ム、酸化チタン、硼砂、炭酸カリ、炭酸マグネシ
ウム等の原料粉末の混合物を、タンク炉あるいは
白金製ルツボで、1300〜1400℃で溶解し撹拌し
て、充分な均質化、泡切れを行つた後、適当な温
度に余熱した金型に鋳込み、あるいは直接プレス
成形してから徐冷することによつて製造する。[Table] These glasses are made by melting and stirring a mixture of raw material powders such as silica powder, aluminum hydroxide, titanium oxide, borax, potassium carbonate, and magnesium carbonate at 1300 to 1400°C in a tank furnace or platinum crucible. After sufficient homogenization and removal of bubbles, the material is cast into a mold preheated to an appropriate temperature, or directly press-molded and then slowly cooled.
Claims (1)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2163783A JPS59152240A (en) | 1983-02-14 | 1983-02-14 | Optical glass |
| GB08328871A GB2137189B (en) | 1983-02-14 | 1983-10-28 | Optical glass |
| FR8317567A FR2540857B1 (en) | 1983-02-14 | 1983-11-04 | OPTICAL GLASS |
| DE19833340005 DE3340005C2 (en) | 1983-02-14 | 1983-11-04 | Use of an optical glass having a low specific weight and a high refractive index as a glass for an eyeglass lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2163783A JPS59152240A (en) | 1983-02-14 | 1983-02-14 | Optical glass |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32523887A Division JPS63225551A (en) | 1987-12-24 | 1987-12-24 | Optical glass |
| JP32523987A Division JPS63233023A (en) | 1987-12-24 | 1987-12-24 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59152240A JPS59152240A (en) | 1984-08-30 |
| JPS6335579B2 true JPS6335579B2 (en) | 1988-07-15 |
Family
ID=12060580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2163783A Granted JPS59152240A (en) | 1983-02-14 | 1983-02-14 | Optical glass |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS59152240A (en) |
| DE (1) | DE3340005C2 (en) |
| FR (1) | FR2540857B1 (en) |
| GB (1) | GB2137189B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6183645A (en) * | 1984-09-28 | 1986-04-28 | Hoya Corp | Glass for lens of color contrast spectacles |
| JPS6330343A (en) * | 1986-07-23 | 1988-02-09 | Sumitomo Electric Ind Ltd | Silica glass added with lanthanoid element |
| CA1320505C (en) * | 1987-11-04 | 1993-07-20 | Jean Emile Boudot | Medium refractive index glass suitable for ophthalmic applications |
| DE69307936D1 (en) * | 1992-03-11 | 1997-03-20 | British Glass Mfg Confederatio | Glass compositions |
| DE19958517C1 (en) * | 1999-12-04 | 2001-06-21 | Schott Glas | Lead-free optical light flint glasses |
| DE10133521C1 (en) * | 2001-07-10 | 2002-09-05 | Schott Glas | Lead-free optical glass contains oxides of silicon, aluminum, sodium, titanium, zirconium, niobium and tantalum, and fluorine |
| CN109912195B (en) * | 2019-04-24 | 2021-12-07 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
| CN109896740B (en) * | 2019-04-24 | 2022-04-22 | 成都光明光电股份有限公司 | Optical glass and optical element |
| CN109987838B (en) * | 2019-04-24 | 2022-04-15 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
| CN109867442B (en) * | 2019-04-24 | 2021-11-26 | 成都光明光电股份有限公司 | Optical glass |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145638A (en) * | 1982-02-20 | 1983-08-30 | シヨツト・グラスヴエルケ | Optical and ophthalmic glass with refractive index 1.56, abbe's no 40 and density 2.70 g/cm3 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2554952A (en) * | 1946-09-21 | 1951-05-29 | Holophane Co Inc | Titania-containing silicate glass |
| GB2115403B (en) * | 1982-02-20 | 1985-11-27 | Zeiss Stiftung | Optical and opthalmic glass |
-
1983
- 1983-02-14 JP JP2163783A patent/JPS59152240A/en active Granted
- 1983-10-28 GB GB08328871A patent/GB2137189B/en not_active Expired
- 1983-11-04 FR FR8317567A patent/FR2540857B1/en not_active Expired
- 1983-11-04 DE DE19833340005 patent/DE3340005C2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145638A (en) * | 1982-02-20 | 1983-08-30 | シヨツト・グラスヴエルケ | Optical and ophthalmic glass with refractive index 1.56, abbe's no 40 and density 2.70 g/cm3 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2540857A1 (en) | 1984-08-17 |
| GB2137189A (en) | 1984-10-03 |
| DE3340005A1 (en) | 1984-08-16 |
| GB8328871D0 (en) | 1983-11-30 |
| FR2540857B1 (en) | 1986-04-25 |
| JPS59152240A (en) | 1984-08-30 |
| GB2137189B (en) | 1987-01-28 |
| DE3340005C2 (en) | 1985-09-19 |
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