JP7429622B2 - Optical glass manufacturing method - Google Patents
Optical glass manufacturing method Download PDFInfo
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- JP7429622B2 JP7429622B2 JP2020142987A JP2020142987A JP7429622B2 JP 7429622 B2 JP7429622 B2 JP 7429622B2 JP 2020142987 A JP2020142987 A JP 2020142987A JP 2020142987 A JP2020142987 A JP 2020142987A JP 7429622 B2 JP7429622 B2 JP 7429622B2
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- 239000005304 optical glass Substances 0.000 title claims description 59
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 239000011521 glass Substances 0.000 claims description 166
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 57
- 229910052697 platinum Inorganic materials 0.000 claims description 29
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 21
- 239000000460 chlorine Substances 0.000 claims description 21
- 229910052801 chlorine Inorganic materials 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 8
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 description 31
- 238000004031 devitrification Methods 0.000 description 28
- 238000002834 transmittance Methods 0.000 description 21
- 230000003287 optical effect Effects 0.000 description 18
- 238000004040 coloring Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000126 substance Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 5
- 229910018068 Li 2 O Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000010309 melting process Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000006060 molten glass Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 platinum ions Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 1
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical class OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 150000001495 arsenic compounds Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 229940093920 gynecological arsenic compound Drugs 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
-
- 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
-
- 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
- C03C1/004—Refining agents
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)
- Glass Melting And Manufacturing (AREA)
Description
ę¬ēŗęćÆćå å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć«é¢ććć The present invention relates to a method for manufacturing optical glass.
čæ幓ćå å¦ē³»ćä½æēØććę©åØć®ććøćæć«åćé«ē²¾ē“°åćę„éć«é²ćć§ćććććøćæć«ć«ć”ć©ććććŖć«ć”ć©ēć®ę®å½±ę©åØćććććøć§ćÆćæććććøć§ćÆć·ć§ć³ćć¬ćēć®ē»ååēļ¼ęå½±ļ¼ę©åØēć®åēØ®å å¦ę©åØć®åéć§ćÆćå å¦ē³»ć§ēØććććć¬ć³ćŗćććŖćŗć ēć®å å¦ē“ åć®ęę°ćåęøććå å¦ē³»å Øä½ćč»½éååć³å°ååććč¦ę±ćå¼·ć¾ć£ć¦ććć In recent years, the digitalization and high definition of devices that use optical systems have progressed rapidly, and various optical devices such as photographic devices such as digital cameras and video cameras, and image reproduction (projection) devices such as projectors and projection televisions, etc. In the field of optical systems, there is an increasing demand to reduce the number of optical elements such as lenses and prisms used in optical systems, and to reduce the weight and size of the entire optical system.
å å¦ć¬ć©ć¹ćč£½é ććäøć§å©å ćŖć©ć«ććēØććććē½éćÆćčē¹ćļ¼ļ¼ļ¼ļ¼āč¶ ćØé«ćć¬ć©ć¹ć®ēč§£ć«é©ćć¦ććåé¢ćé øē“ ćØååæćć¦å£åććććććé øåćććē½éćē½éć¤ćŖć³ćć¬ć©ć¹äøć«ęŗ¶ćåŗćć¦ćć¾ććć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éćÆåÆč¦å ćåøåćććććęēµč£½åć§ććå å¦ć¬ć©ć¹ć®ēč²ćęćć Platinum, which is often used in crucibles in the production of optical glass, has a high melting point of over 1,700Ā°C and is suitable for melting glass, but on the other hand, it easily reacts with oxygen and deteriorates, so oxidized platinum and platinum ions are used in glass production. It melts inside. The platinum that dissolves into the glass absorbs visible light, resulting in coloring of the final product, optical glass.
ć¾ććå å¦ć¬ć©ć¹ć®ęēµč£½åć«ććć¦ćÆę³”ć®ę··å „ćå°ćŖćććØćęć¾ćććä¾ćć°ćę³”ćę··å „ććå å¦ć¬ć©ć¹ćć¬ć³ćŗć«ććå “åćęå½±ććē»åć«ę³”ćę ćč¾¼ćć ććę³”ć«ććę£ä¹±å ć®å½±éæć§ę åć®ä¹±ććęćć Furthermore, it is desired that the final optical glass product contains fewer bubbles. For example, if a lens is made of optical glass that has bubbles mixed in, the bubbles will be reflected in the projected image, and the image will be distorted due to the effects of light scattered by the bubbles.
å
å¦ć¬ć©ć¹ć«ć©ć®ēØåŗ¦ć®ę³”ćå«ęćć¦ććććč”ØćęęØćØćć¦ćÆćę„ę¬å
å¦ē”åå·„ę„ä¼č¦ę ¼ļ¼Ŗļ¼Æļ¼§ļ¼©ļ¼³ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ćå
å¦ć¬ć©ć¹ć®ę³”ć®ęø¬å®ę¹ę³ććēØćććć¦ććć
ę„ę¬å
å¦ē”åå·„ę„ä¼č¦ę ¼ļ¼Ŗļ¼Æļ¼§ļ¼©ļ¼³ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ćå
å¦ć¬ć©ć¹ć®ę³”ć®ęø¬å®ę¹ę³ćć§ćÆćå
å¦ć¬ć©ć¹äøć«ååØććę°ę³”ć§ē“å¾ćļ¼ļ¼Ī¼ļ½ä»„äøć®ćć®ćę³”ćØćć¦ććć
The Japan Optical Glass Industry Association standard JOGIS 12-2012 "Method for Measuring Bubbles in Optical Glass" is used as an indicator of how many bubbles are contained in optical glass.
According to the Japan Optical Glass Industry Association standard JOGIS 12-2012 "Method for measuring bubbles in optical glass," bubbles that exist in optical glass and have a diameter of 30 Ī¼m or more are considered bubbles.
ććććč¦ę ¼äøåé”ć«ćŖććŖććććŖē“å¾ćļ¼ļ¼Ī¼ļ½ęŖęŗć®å¾®ē“°ćŖę³”ć§ćććć®ę°ćå¤ććØå
éØåč³ŖćęŖåććē“å¾ćļ¼ļ¼Ī¼ļ½ä»„äøć®ę³”ćØåēć¾ććÆćć仄äøć«ęēµč£½åćøå½±éæćäøććććØćććć
ä»ę¹ć§ćå
å¦ć¬ć©ć¹ć®ē½éē±ę„ć®ēč²ćä½ęøćććć¬ć©ć¹äøć®ę³”ćęøććććć«ć仄äøć«čØč¼ćććććŖę¹ę³ćęčØććć¦ććć
However, even if there are many microscopic bubbles with a diameter of less than 30 Ī¼m, which do not pose a problem in terms of standards, the internal quality may deteriorate, and they may affect the final product as much as or more than bubbles with a diameter of 30 Ī¼m or more. be.
On the other hand, in order to reduce platinum-derived coloring of optical glass and reduce bubbles in the glass, the following methods have been proposed.
ē¹čرęē®ļ¼ć§ćÆćēč§£å·„ēØć«ććć¦ę°“åéćé«ććććØć§ē½éē±ę„ć®ēč²ćä½ęøćććć¬ć©ć¹ćå¾ćććććØćč¦åŗćć¦ććć
ē¹čرęē®ļ¼ć§ćÆćć¬ć©ć¹ćēčććéć«ē”«é»ęåćé
øåå¤ćØćć¦ēØććććØć§ćč±ę³”å¹ęć®é«ćć¬ć©ć¹ćå¾ćććććØćč¦åŗćć¦ććć
Patent Document 1 has discovered that glass with reduced platinum-derived coloration can be obtained by increasing the water content in the melting process.
Patent Document 2 has discovered that glass with a high defoaming effect can be obtained by using a sulfur component as an oxidizing agent when melting glass.
å
å¦ć¬ć©ć¹ćēč§£ććéćÆćć¬ć©ć¹ć®ēč§£éćä½æēØććåęćēē£čØåćēčę”件ćŖć©ć§ē½éē±ę„ć®ć¬ć©ć¹ćøć®ēč²ćć¬ć©ć¹äøć®ę³”ć®ēŗēćęå¶ććććć®ęé©ćŖę¹ę³ćē°ćŖććććå½ę„č
ćÆę§ć
ćŖę¹ę³ćé©å®éøęć§ććććØćę±ćććć¦ććć
ć¾ććč¦ę ¼äøåé”ć«ćŖććŖććććŖå¾®ē“°ćŖę³”ćä½ęøćććę¹ę³ć«ć¤ćć¦ćÆćå¾ę„ć®ēŗęć§ćÆč¦åŗććć¦ććŖćć£ćć
When melting optical glass, the optimal method for suppressing platinum-derived coloring of the glass and generation of bubbles in the glass varies depending on the amount of glass melted, the raw materials used, production equipment, melting conditions, etc. Those skilled in the art are required to be able to select various methods as appropriate.
Furthermore, no conventional invention has found a method for reducing fine bubbles that do not pose a problem in terms of standards.
ę¬ēŗęćÆäøčØå®ē¶ć«éćæć¦ćŖććććć®ć§ćć£ć¦ććć®ē®ēćØćććØćććÆćēč§£éēØć§é øåćć¦ć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éć«ććć¬ć©ć¹ć®ēč²ćęå¶ććŖćććå¾®ē“°ćŖę³”ć®ēŗēćä½ęøćććå å¦ć¬ć©ć¹ćå¾ćććØć«ććć The present invention was made in view of the above-mentioned circumstances, and its purpose is to prevent the formation of fine bubbles while suppressing the coloring of the glass due to platinum that oxidizes and dissolves into the glass during the melting process. The objective is to obtain a reduced optical glass.
ę¬ēŗęč ćÆäøčØčŖ²é”ćč§£ę±ŗććććć«éę試éØē ē©¶ćéććēµęćļ¼¢ļ¼ļ¼Æļ¼ęååć³ļ¼¬ļ½ļ¼ļ¼Æļ¼ęåćå«ćåęć«ćéå å¤åć³å”©ē“ ćę·»å ććććØć«ćć£ć¦ćć¬ć©ć¹ćēč§£ććéēØć§é øåćć¦ć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éć«ććć¬ć©ć¹ć®ēč²ćęå¶ććŖćććå¾®ē“°ćŖę³”ć®ēŗēćä½ęøćććå å¦ć¬ć©ć¹ć®č£½é ę¹ę³ćč¦åŗććć As a result of extensive testing and research to solve the above problems, the present inventor has developed a process for melting glass by adding a reducing agent and chlorine to a raw material containing 3 B 2 O components and 3 La 2 O components. We have discovered a method for producing optical glass that suppresses the formation of fine bubbles while suppressing the coloring of the glass due to platinum oxidized and dissolved into the glass.
å ·ä½ēć«ćÆćę¬ēŗęćÆ仄äøć®ćććŖćć®ćęä¾ććć Specifically, the present invention provides the following.
ļ¼ļ¼ļ¼ć¬ć©ć¹åęćēčććå
å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć§ćć£ć¦ć
åčØć¬ć©ć¹åęćÆćé
øåē©ęē®ć®č³Ŗéļ¼
ć§ć
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ć
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ć
å«ęćć
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å¤åć³å”©ē“ ćę·»å ććććØćē¹å¾“ćØćććå
å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć
(1) A method for producing optical glass by melting glass raw materials,
The glass raw material is mass % in terms of oxide,
La 2 O 3 components 30.0 to 65.0%,
3.0 to 25.0% of B 2 O 3 components,
Contains
A method for producing optical glass, characterized by adding a reducing agent and chlorine.
ļ¼ļ¼ļ¼åčØć¬ć©ć¹åęćÆćé
øåē©ęē®ć®č³Ŗéļ¼
ć§ć
ļ¼³ļ½ļ¼Æļ¼ęåćļ¼ļ¼ļ¼ļ¼ļ¼
仄äøć§ććć
ļ¼“ļ½ļ¼Æļ¼ęåćļ¼®ļ½ļ¼ļ¼Æļ¼ęåćļ¼·ļ¼Æļ¼ęåćå°ćŖććØćäøć¤ä»„äø
å«ęććć
ļ¼ļ¼ļ¼ć«čØč¼ć®å
å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć
(2) The glass raw material is mass% in terms of oxide,
SiO2 component is 20.0% or less,
Containing at least one or more of 2 TiO components, 5 Nb 2 O components, and 3 WO components,
The method for producing optical glass according to (1).
ļ¼ļ¼ļ¼å”©ē“ ćļ¼ļ¼ļ¼ļ¼ļ¼
仄äøę·»å ććććØćē¹å¾“ćØććć
ļ¼ļ¼ļ¼åćÆļ¼ļ¼ļ¼ć«čØč¼ć®å
å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć
(3) characterized by adding 0.01% or more of chlorine;
The method for producing optical glass according to (1) or (2).
ļ¼ļ¼ļ¼åčØå
å¦ć¬ć©ć¹ćÆćē½éć®å«ęéćļ¼ļ½ļ½ļ½ä»„äøć§ććć
ļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ć«čØč¼ć®å
å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć
(4) The optical glass has a platinum content of 8 ppm or less,
The method for producing optical glass according to (1) to (3).
ę¬ēŗęćÆäøčØåé”ē¹ć«éćæć¦ćŖććććć®ć§ćć£ć¦ććć®ē®ēćØćććØćććÆćļ¼¬ļ½ļ¼ļ¼Æļ¼ęååć³ļ¼¢ļ¼ļ¼Æļ¼ęåćå«ćåęć«ćéå å¤åć³å”©ē“ ćę·»å ććććØć«ćć£ć¦ćć¬ć©ć¹ćēč§£ććéēØć§é øåćć¦ć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éć«ććć¬ć©ć¹ć®ēč²ćęå¶ććŖćććå¾®ē“°ćŖę³”ć®ēŗēćä½ęøćććå å¦ć¬ć©ć¹ć®č£½é ę¹ę³ćęä¾ććććØć§ććć The present invention has been made in view of the above-mentioned problems, and its purpose is to add a reducing agent and chlorine to a raw material containing three La 2 O components and three B 2 O components, thereby producing glass. An object of the present invention is to provide a method for producing optical glass that suppresses the formation of fine bubbles while suppressing the coloring of the glass due to platinum oxidized and dissolved into the glass during the process of melting the glass.
ę¬ēŗęć®å å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć«ććć°ćé øåē©ęē®ć®č³Ŗéļ¼ ć§ćļ¼¬ļ½ļ¼ļ¼Æļ¼ęåćļ¼ļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ¼ļ¼ ćļ¼¢ļ¼ļ¼Æļ¼ęåćļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ¼ļ¼ å«ęććć¬ć©ć¹ć®åęć«éå å¤åć³å”©ē“ ćę·»å ććććØć§ćć¬ć©ć¹ćēč§£ććéēØć§é øåćć¦ć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éć«ććć¬ć©ć¹ć®ēč²ćęå¶ććŖćććå¾®ē“°ćŖę³”ć®ēŗēćęå¶ććå å¦ć¬ć©ć¹ćå¾ćććØćć§ććć According to the method for producing optical glass of the present invention, it contains 30.0 to 65.0% of the 3 components of La 2 O and 3.0 to 25.0% of the 3 components of B 2 O in terms of mass % in terms of oxides. By adding a reducing agent and chlorine to the glass raw materials, we have created an optical system that suppresses the coloring of the glass due to platinum that oxidizes and dissolves into the glass during the melting process, and also suppresses the formation of microscopic bubbles. You can get glass.
仄äøćę¬ēŗęć®å å¦ć¬ć©ć¹åć³å å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć®å®ę½å½¢ę ć«ć¤ćć¦č©³ē“°ć«čŖ¬ęćććę¬ēŗęćÆ仄äøć®å®ę½å½¢ę ć«ä½ćéå®ććććć®ć§ćÆćŖććę¬ēŗęć®ē®ēć®ēÆå²å ć«ććć¦é©å®å¤ę“ćå ćć¦å®ę½ććććØćć§ććććŖććčŖ¬ęćéč¤ććē®ęć«ć¤ćć¦é©å®čŖ¬ęćēē„ććå “åćććććēŗęć®č¶£ęØćéå®ćććć®ć§ćÆćŖćć EMBODIMENT OF THE INVENTION Hereinafter, the embodiment of the optical glass and the manufacturing method of the optical glass of this invention is described in detail. The present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present invention. Note that the description may be omitted as appropriate for parts where the description overlaps, but this does not limit the gist of the invention.
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[Glass component]
In this specification, unless otherwise specified, the content of each component is expressed in mass % based on the total mass of the composition in terms of oxides. Here, the "composition equivalent to oxide" refers to the composition when it is assumed that the oxides, composite salts, metal fluorides, etc. used as raw materials for the glass components of the present invention are all decomposed and converted into oxides when melted. The composition shows each component contained in the glass, with the total mass of the produced oxides being 100% by mass.
ļ¼¬ļ½ļ¼ļ¼Æļ¼ęåćÆćć¬ć©ć¹ć®å±ęēćé«ćććØćØćć«ćć¬ć©ć¹ć®åå¦ēčä¹ ę§ćåäøććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®åæ é ęåć§ćććē¹ć«ćļ¼¬ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®č失éę§ćé«ćć¤ć¤ć¢ććę°ć大ććććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¬ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¬ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The La 2 O 3 component is a component that increases the refractive index of the glass and improves the chemical durability of the glass, and is an essential component in the glass of the present invention. In particular, by setting the content of the La 2 O 3 component to 65.0% or less, the Abbe number can be increased while improving the devitrification resistance of the glass. Therefore, the upper limit of the content of the La 2 O 3 components relative to the total mass of the glass in terms of oxide composition is preferably 65.0% or less, more preferably 62.0% or less, and most preferably 59.0% or less. Upper limit. On the other hand, the lower limit of the content of the three La 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 30.0% or more, more preferably 35.0% or more, and most preferably 40.0% or more. .
ļ¼¢ļ¼ļ¼Æļ¼ęåćÆćå®å®ćŖć¬ć©ć¹ć®å½¢ęćäæćććØć§č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®åæ é ęåć§ćććē¹ć«ćļ¼¢ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćļ¼¢ļ¼ļ¼Æļ¼ęåć«ććå±ęēć®ä½äøćęćććććććé«å±ęēćå¾ęćććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¢ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¢ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The B 2 O 3 component is a component that enhances devitrification resistance by promoting the formation of a stable glass, and is an essential component in the glass of the present invention. In particular, by setting the content of the B 2 O 3 components to 25.0% or less, a decrease in the refractive index due to the B 2 O 3 components can be suppressed, making it easier to obtain a high refractive index. Therefore, the upper limit of the content of the three B 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 25.0% or less, more preferably 20.0% or less, and even more preferably 15.0% or less. . On the other hand, the lower limit of the content of the three B 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 3.0% or more, more preferably 4.0% or more, and most preferably 5.0% or more. .
ļ¼®ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēåć³ć¢ććę°ćé«ććęåć§ćććäøę¹ćļ¼®ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®å®å®ę§ćé«ććč失éę§ćé«ććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼®ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Nb 2 O 5 component is a component that increases the refractive index and Abbe number of the glass when it is contained in an amount exceeding 0%.On the other hand, by reducing the content of the Nb 2 O 5 component to 15.0% or less, the glass It is possible to improve the stability and devitrification resistance. Therefore, the upper limit of the content of the five Nb 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 15.0% or less, more preferably 13.0% or less, and most preferably 11.0% or less. .
ļ¼³ļ½ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ēč²ćä½ęøććććØć§ēę³¢é·ć®åÆč¦å ć«åƾććééēćé«ćććØćØćć«ćå®å®ćŖć¬ć©ć¹å½¢ęćäæćććØć§ć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼³ļ½ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćļ¼³ļ½ļ¼Æļ¼ęåć«ććå±ęēć®ä½äøćęćććććććé«å±ęēćå¾ęćććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼³ļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼³ļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ č¶ ććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć When the SiO2 component is contained in an amount exceeding 0%, it is a component that increases the transmittance of short-wavelength visible light by reducing the coloring of the glass, and also increases the devitrification resistance of the glass by promoting stable glass formation. and is an optional component in the glass of the present invention. In particular, by setting the content of the SiO 2 component to 20.0% or less, a decrease in the refractive index due to the SiO 2 component can be suppressed, making it easier to obtain a high refractive index. Therefore, the content of the two SiO components relative to the total mass of the glass in terms of oxide composition is preferably 20.0% or less, more preferably 15.0% or less, more preferably 12.0% or less, and most preferably 9.0% or less. The upper limit is 0% or less. On the other hand, the lower limit of the content of the two SiO 2 components relative to the total mass of the glass in terms of oxide composition is preferably more than 0%, more preferably 1.0% or more, and most preferably 2.0% or more.
ļ¼“ļ½ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēćé«ććäøć¤ć¬ć©ć¹ć®åå¦ēčä¹ ę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹ć®ä»»ęęåć§ćććē¹ć«ćļ¼“ļ½ļ¼Æļ¼ęåćå«ćććØć§ćé«å±ęēćå¾ćććØćć§ćććäøę¹ćļ¼“ļ½ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćéå°ćŖå«ęć«ćć失éćęå¶ćććć¤ééēć®å£åćęććććØćć§ćććé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼“ļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ č¶ ććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼“ļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The TiO 2 component is a component that increases the refractive index of the glass and the chemical durability of the glass when it is contained in an amount exceeding 0%, and is an optional component of the glass of the present invention. In particular, by including two components of TiO, a high refractive index can be obtained. On the other hand, by controlling the content of the two TiO 2 components to 25.0% or less, devitrification due to excessive content can be suppressed, and deterioration of transmittance can be suppressed. The lower limit of the content of the two TiO components relative to the total mass of the glass in terms of oxide composition is preferably more than 0%, more preferably 3.0% or more, and most preferably 6.0% or more. On the other hand, the upper limit of the content of the two TiO components relative to the total mass of the glass in terms of oxide composition is preferably 25.0% or less, more preferably 20.0% or less, and most preferably 15.0% or less.
ļ¼”ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®åå¦ēčä¹ ę§ćåäøćć¤ć¤ćć¬ć©ć¹ēčęć®ē²åŗ¦ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼”ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®ēčę§ćé«ćć¤ć¤ćć¬ć©ć¹ć®å¤±éå¾åćå¼±ććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼”ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Al 2 O 3 component is a component that, when contained in an amount exceeding 0%, improves the chemical durability of the glass and increases the viscosity when the glass is melted, and is an optional component in the glass of the present invention. In particular, by controlling the content of the three Al 2 O components to 10.0% or less, it is possible to increase the meltability of the glass and weaken the tendency of the glass to devitrify. Therefore, the upper limit of the content of the three Al 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and most preferably 3.0% or less. .
ļ¼¹ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēćé«ććć¢ććę°ć大ććććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼¹ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®č失éę§ćé«ćć¤ć¤ęęć®å å¦ę°ćå¾ćććØćåÆč½ć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¹ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¹ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ č¶ ććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Y 2 O 3 component is a component that increases the refractive index of the glass and increases the Abbe number when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the three Y 2 O components to 15.0% or less, it is possible to obtain a desired optical number while increasing the devitrification resistance of the glass. Therefore, the upper limit of the content of the three Y 2 O components relative to the total mass of the glass in terms of oxide composition is preferably 15.0% or less, more preferably 12.0% or less, and most preferably 11.0% or less. . On the other hand, the lower limit of the content of the three Y 2 O components relative to the total mass of the glass in terms of oxide composition is preferably more than 0%, more preferably 3.0% or more, and most preferably 5.0% or more.
ļ¼§ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēćé«ććć¢ććę°ć大ććććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼§ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®č失éę§ćé«ćć¤ć¤ęęć®å å¦ę°ćå¾ćććØćåÆč½ć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼§ļ½ļ¼ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Gd 2 O 3 component is a component that increases the refractive index of the glass and increases the Abbe number when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the Gd 2 O 3 component to 20.0% or less, it is possible to obtain a desired optical number while increasing the devitrification resistance of the glass. Therefore, the content of the Gd 2 O 3 components relative to the total mass of the glass in terms of oxide composition is preferably 20.0% or less, more preferably 15.0% or less, more preferably 10.0% or less, and more preferably The upper limit is 5.0% or less, most preferably 3.0% or less.
ļ¼ŗļ½ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ēč²ćä½ęøćć¦ēę³¢é·ć®åÆč¦å ć«åƾććééēćé«ćććØćØćć«ćå®å®ćŖć¬ć©ć¹å½¢ęćäæćć¦ć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććäøę¹ć§ćļ¼ŗļ½ļ¼Æļ¼ęåć®å«ęéćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćļ¼ŗļ½ļ¼Æļ¼ęåć®éå°ćŖå«ęć«ćć失éćä½ęøć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼ŗļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼ŗļ½ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ č¶ ććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć When the ZrO2 component is contained in an amount exceeding 0%, it is a component that reduces the coloring of the glass and increases the transmittance of short wavelength visible light, and also promotes stable glass formation and increases the devitrification resistance of the glass. , is an optional component in the glass of the present invention. On the other hand, by controlling the content of the ZrO 2 components to 15.0% or less, devitrification due to excessive content of the ZrO 2 components can be reduced. Therefore, the upper limit of the content of the two ZrO components relative to the total mass of the glass in terms of oxide composition is preferably 15.0% or less, more preferably 12.0% or less, and most preferably 9.0% or less. do. On the other hand, the lower limit of the content of the two ZrO components relative to the total mass of the glass in terms of oxide composition is preferably more than 0%, more preferably 1.0% or more, and most preferably 3.0% or more.
ļ¼·ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēćäøććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼·ļ¼Æļ¼ęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćć¬ć©ć¹ć®č失éę§ćé«ćććØćØćć«ćēę³¢é·ć®åÆč¦å ć«åƾććć¬ć©ć¹ć®ééēć®ä½äøćęććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼·ļ¼Æļ¼ęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The WO 3 component is a component that increases the refractive index of the glass when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the three WO components to 15.0% or less, it is possible to improve the devitrification resistance of the glass and to suppress a decrease in the transmittance of the glass to short-wavelength visible light. Therefore, the upper limit of the content of the three WO components relative to the total mass of the glass in terms of oxide composition is preferably 15.0% or less, more preferably 10.0% or less, and most preferably 5.0% or less.
ļ¼ŗļ½ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ę¶²ēøęø©åŗ¦ćäøććäøć¤ć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼ŗļ½ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēåć³ä½åę£ćå¾ęćććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼ŗļ½ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The ZnO component is a component that lowers the liquidus temperature of the glass and increases the devitrification resistance of the glass when it is contained in an amount of more than 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the ZnO component to 15.0% or less, it is possible to easily obtain a high refractive index and low dispersion. Therefore, the upper limit of the content of the ZnO component with respect to the total mass of the glass in terms of oxide composition is preferably 15.0% or less, more preferably 12.0% or less, and most preferably 9.0% or less.
ļ¼ļ½ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ę¶²ēøęø©åŗ¦ćäøććć¬ć©ć¹ć®č失éę§ćé«ććä»»ęęåć§ćććäøć¤ćåÆč¦å ć«åƾććééēćä½äøćé£ćććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼ļ½ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēåć³ä½åę£ćå¾ęćććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼ļ½ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The MgO component is an optional component that lowers the liquidus temperature of the glass and increases the devitrification resistance of the glass when it is contained in an amount exceeding 0%, and is a component that makes it difficult to reduce the transmittance of visible light. It is an optional component in the glass of the invention. In particular, by controlling the content of the MgO component to 10.0% or less, it is possible to easily obtain a high refractive index and low dispersion. Therefore, the upper limit of the content of the MgO component relative to the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and most preferably 3.0% or less.
ļ¼£ļ½ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ę¶²ēøęø©åŗ¦ćäøććć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼£ļ½ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēåć³ä½åę£ćå¾ęćććććØćć§ććäøć¤ć¬ć©ć¹ć®č失éę§åć³åå¦ēčä¹ ę§ć®ä½äøćęććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼£ļ½ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The CaO component is a component that lowers the liquidus temperature of the glass and increases the devitrification resistance of the glass when it is contained in an amount of more than 0%, and is an optional component in the glass of the present invention. In particular, by setting the content of CaO component to 20.0% or less, it is possible to easily obtain a high refractive index and low dispersion, and it is possible to suppress a decrease in the devitrification resistance and chemical durability of the glass. can. Therefore, the upper limit of the content of the CaO component with respect to the total mass of the glass in terms of oxide composition is preferably 20.0% or less, more preferably 15.0% or less, and most preferably 10.0% or less.
ļ¼³ļ½ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ę¶²ēøęø©åŗ¦ćäøććć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼³ļ½ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēåć³ä½åę£ćå¾ęćććććØćć§ććäøć¤ć¬ć©ć¹ć®č失éę§åć³åå¦ēčä¹ ę§ć®ä½äøćęććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼³ļ½ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The SrO component is a component that lowers the liquidus temperature of the glass and increases the devitrification resistance of the glass when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the SrO component to 10.0% or less, it is possible to easily obtain a high refractive index and low dispersion, and it is possible to suppress a decrease in the devitrification resistance and chemical durability of the glass. can. Therefore, the upper limit of the content of the SrO component relative to the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and most preferably 3.0% or less.
ļ¼¢ļ½ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®å±ęēćé«ććć¬ć©ć¹ć®č失éę§ćé«ććęåć§ćććäøć¤ćåÆč¦å ć«åƾććééēćä½äøćé£ćććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼¢ļ½ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēåć³ä½åę£ćå¾ęćććććØćć§ććäøć¤č失éę§åć³åå¦ēčä¹ ę§ć®ä½äøćęććććØćć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¢ļ½ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The BaO component is a component that increases the refractive index of the glass and increases the devitrification resistance of the glass when it is contained in an amount of more than 0%, and is a component that makes it difficult to reduce the transmittance of visible light. It is an optional component in glass. In particular, by controlling the content of the BaO component to 20.0% or less, it is possible to easily obtain a high refractive index and low dispersion, and it is possible to suppress a decrease in devitrification resistance and chemical durability. Therefore, the upper limit of the content of the BaO component with respect to the total mass of the glass in terms of oxide composition is preferably 20.0% or less, more preferably 15.0% or less, and most preferably 10.0% or less.
ļ¼¬ļ½ļ¼ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ēč§£ęø©åŗ¦ćäøććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼¬ļ½ļ¼ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēćå¾ęćććććØćć§ććäøć¤ć¬ć©ć¹ć®å®å®ę§ćé«ćć¦å¤±éēć®ēŗēćä½ęøć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼¬ļ½ļ¼ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Li 2 O component is a component that lowers the melting temperature of the glass when contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the Li 2 O component to 10.0% or less, a high refractive index can be easily obtained, and the stability of the glass can be increased to reduce the occurrence of devitrification and the like. Therefore, the upper limit of the content of the Li 2 O component with respect to the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and most preferably 3.0% or less.
ļ¼®ļ½ļ¼ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ēč§£ęø©åŗ¦ćäøććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼®ļ½ļ¼ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēćå¾ęćććććØćć§ććäøć¤ć¬ć©ć¹ć®å®å®ę§ćé«ćć¦å¤±éēć®ēŗēćä½ęøć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼®ļ½ļ¼ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Na 2 O component is a component that lowers the melting temperature of the glass when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the Na 2 O component to 10.0% or less, it is possible to easily obtain a high refractive index, and also to improve the stability of the glass and reduce the occurrence of devitrification and the like. Therefore, the upper limit of the content of the Na 2 O component relative to the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and most preferably 3.0% or less.
ļ¼«ļ¼ļ¼ÆęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ćć¬ć©ć¹ć®ēč§£ęø©åŗ¦ćäøććęåć§ćććę¬ēŗęć®ć¬ć©ć¹äøć®ä»»ęęåć§ćććē¹ć«ćļ¼«ļ¼ļ¼Æęåć®å«ęēćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć«ććććØć§ćé«å±ęēćå¾ęćććććØćć§ććäøć¤ć¬ć©ć¹ć®å®å®ę§ćé«ćć¦å¤±éēć®ēŗēćä½ęøć§ćććå¾ć£ć¦ćé øåē©ęē®ēµęć®ć¬ć©ć¹å Øč³Ŗéć«åƾććļ¼«ļ¼ļ¼Æęåć®å«ęēćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The K 2 O component is a component that lowers the melting temperature of the glass when it is contained in an amount exceeding 0%, and is an optional component in the glass of the present invention. In particular, by controlling the content of the K 2 O component to 10.0% or less, it is possible to easily obtain a high refractive index, and also to improve the stability of the glass and reduce the occurrence of devitrification and the like. Therefore, the upper limit of the content of the K 2 O component based on the total mass of the glass in terms of oxide composition is preferably 10.0% or less, more preferably 5.0% or less, and even more preferably 3.0% or less.
ļ¼“ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ć¬ć©ć¹ć®å±ęēćé«ććććäøć¤č失éę§ćé«ććććęåć§ćććļ¼“ļ½ļ¼ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Ta 2 O 5 component is a component that, when contained in an amount exceeding 0%, can increase the refractive index of the glass and improve the devitrification resistance. The upper limit of the content of the five Ta 2 O components is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and even more preferably 0.5% or less.
ļ¼°ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ć¬ć©ć¹ć®ę¶²ēøęø©åŗ¦ćäøćć¦č失éę§ćé«ććććęåć§ćććļ¼°ļ¼ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The P 2 O 5 component is a component that lowers the liquidus temperature of the glass and improves the devitrification resistance when it is contained in an amount exceeding 0%. The upper limit of the content of the P 2 O 5 component is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and still more preferably 0.5% or less.
ļ¼§ļ½ ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ć¬ć©ć¹ć®å±ęēćé«ććććäøć¤č失éę§ćåäøć§ććęåć§ćććļ¼§ļ½ ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The GeO 2 component is a component that can increase the refractive index of the glass and improve the devitrification resistance when it is contained in an amount exceeding 0%. The upper limit of the content of the two GeO components is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and still more preferably 0.5% or less.
ļ¼§ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ć¬ć©ć¹ć®åå¦ēčä¹ ę§ćåäøć§ććäøć¤ēčć¬ć©ć¹ć®č失éę§ćåäøć§ććęåć§ćććļ¼§ļ½ļ¼ļ¼Æļ¼ęåć®å«ęéćÆćļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Ga 2 O 3 component is a component that can improve the chemical durability of glass and improve the devitrification resistance of molten glass when it is contained in an amount exceeding 0%. The upper limit of the content of the three Ga 2 O components is 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and even more preferably 0.5% or less.
ļ¼¢ļ½ļ¼ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«å±ęēćé«ććććäøć¤ć¬ć©ć¹č»¢ē§»ē¹ćäøććććęåć§ćććļ¼¢ļ½ļ¼ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The Bi 2 O 3 component is a component that can increase the refractive index and lower the glass transition point when contained in an amount exceeding 0%. The upper limit of the content of the three Bi 2 O components is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and even more preferably 0.5% or less.
ļ¼“ļ½ ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«å±ęēćé«ććććäøć¤ć¬ć©ć¹č»¢ē§»ē¹ćäøććććęåć§ćććļ¼“ļ½ ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The TeO 2 component is a component that can increase the refractive index and lower the glass transition point when contained in an amount exceeding 0%. The upper limit of the content of the two TeO components is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and even more preferably 0.5% or less.
ļ¼³ļ½ļ¼Æļ¼ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ēčć¬ć©ć¹ć®é øåćä½ęøćć¦ęø ę¾ććäøć¤ć¬ć©ć¹ć®åÆč¦å ééēćé«ććććęåć§ćććļ¼³ļ½ļ¼Æļ¼ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The SnO 2 component is a component that, when contained in an amount exceeding 0%, reduces oxidation of the molten glass to clarify it, and increases the visible light transmittance of the glass. The upper limit of the content of the two SnO components is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and still more preferably 0.5% or less.
ļ¼¦ęåćÆćļ¼ļ¼ č¶ å«ęććå “åć«ć¬ć©ć¹ć®ēčę§ćé«ććććØćć§ććęåć§ććććäøę¹ć§å«ęéćå¤ććØļ¼¦ęåć®ę®ēŗć«ćć失éćęćć¦ćć¾ććļ¼¦ęåć®å«ęéćÆć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØććć The F component is a component that can improve the meltability of glass when contained in an amount exceeding 0%, but on the other hand, when the content is too large, devitrification due to volatilization of the F component is caused. The upper limit of the content of the F component is preferably 5.0% or less, more preferably 3.0% or less, more preferably 1.0% or less, and still more preferably 0.5% or less.
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The Sb 2 O 3 component is a component capable of defoaming the molten glass when it is contained in an amount exceeding 0%.
On the other hand, if the content of the three Sb 2 O components is too large, the transmittance in the short wavelength region of the visible light region will deteriorate. Therefore, the upper limit of the content of the three Sb 2 O components is preferably 1.0% or less, more preferably 0.5% or less, and even more preferably 0.3% or less.
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The sum of the contents (sum of mass) of the three Ln 2 O components (in the formula, Ln is one or more selected from the group consisting of La, Y, Gd, and Yb) is 30.0% or more and 65.0%. The devitrification resistance can be improved in the following cases.
Therefore, the sum of the three Ln 2 O components is preferably 30.0% or more, more preferably 32.0% or more, more preferably 35.0% or more, more preferably 38.0% or more, and even more preferably 42.0% or more. The lower limit is .0% or more, more preferably 45.0% or more, even more preferably 47.5% or more.
On the other hand, the upper limit of the sum of the contents (sum of mass) of the three Ln 2 O components is preferably 65.0% or less, more preferably 62.0% or less, and even more preferably 60.0% or less.
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The total content of SiO 2 components, B 2 O 3 components, and Al 2 O 3 components, the mass sum SiO 2 +B 2 O 3 +Al 2 O 3 , is set to 8.0% or more and 28.0% or less. , can increase the stability of the glass.
Therefore, the mass sum SiO 2 +B 2 O 3 +Al 2 O 3 is preferably 8.0% or more, more preferably 9.0% or more, more preferably 10.0% or more, and even more preferably 11.5% or more. The lower limit is more preferably 13.0% or more.
On the other hand, the upper limit of the mass sum SiO 2 +B 2 O 3 +Al 2 O 3 is preferably 28.0% or less, more preferably 26.0% or less, even more preferably 24.0% or less.
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The mass ratio Ln 2 O 3 / (SiO 2 + B 2 O 3 + Al 2 By setting O 3 ) to 6.0 or less, devitrification resistance can be improved.
Therefore, the mass ratio Ln 2 O 3 /(SiO 2 +B 2 O 3 +Al 2 O 3 ) is preferably 6.0 or less, more preferably 5.5 or less, still more preferably 5.0 or less, even more preferably 4 The upper limit is .5 or less.
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By setting the mass sum TiO 2 +Nb 2 O 5 +WO 3 , which is the total content of 2 TiO components, 5 Nb 2 O components, and 3 WO components, to 5.0% or more and 35.0% or less, the refractive index ( It is possible to reduce the reduced color derived from the high refractive index component while increasing n d ).
Therefore, the mass sum TiO 2 +Nb 2 O 5 +WO 3 is preferably 5.0% or more, more preferably 7.0% or more, more preferably 12.0% or more, more preferably 15.5% or more, and The lower limit is preferably 20.0% or more.
On the other hand, the upper limit of the mass sum TiO 2 +Nb 2 O 5 +WO 3 is preferably 35.0% or less, more preferably 30.0% or less, and still more preferably 27.0% or less.
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ļ¼¬ļ½ļ¼ļ¼Æļ¼ęåćļ¼¹ļ¼ļ¼Æļ¼ęåćļ¼§ļ½ļ¼ļ¼Æļ¼ęåćļ¼¹ļ½ļ¼ļ¼Æļ¼ęåćļ¼³ļ½ļ¼Æļ¼ęåćļ¼¢ļ¼ļ¼Æļ¼ęåćļ¼”ļ½ļ¼ļ¼Æļ¼ęåćļ¼“ļ½ļ¼Æļ¼ęåćļ¼®ļ½ļ¼ļ¼Æļ¼ęåćļ¼·ļ¼Æļ¼ęåćļ¼¢ļ½ļ¼ļ¼Æļ¼ęåćļ¼ŗļ½ļ¼Æęåćļ¼ŗļ½ļ¼Æļ¼ęåćļ¼ļ½ļ¼Æęåćļ¼£ļ½ļ¼Æęåćļ¼³ļ½ļ¼Æęåćļ¼¢ļ½ļ¼Æęåćļ¼¬ļ½ļ¼ļ¼Æęåćļ¼®ļ½ļ¼ļ¼Æęåćļ¼«ļ¼ļ¼Æęåćļ¼“ļ½ļ¼ļ¼Æļ¼ęåć
In the present invention, the total content of the following components is preferably 95.0% or more, 97.0% or more, and 98.0% or more in this order.
La 2 O 3 components, Y 2 O 3 components, Gd 2 O 3 components, Yb 2 O 3 components, SiO 2 components, B 2 O 3 components, Al 2 O 3 components, TiO 2 components, Nb 2 O 5 components, WO 3 components, Bi 2 O 3 components, ZnO component, ZrO 2 components, MgO component, CaO component, SrO component, BaO component, Li 2 O component, Na 2 O component, K 2 O component, Ta 2 O 5 components.
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<About ingredients that should not be included>
Next, components that should not be included in the optical glass of the present invention and components that are not preferably included will be explained.
ä»ć®ęåćę¬é”ēŗęć®ć¬ć©ć¹ć®ē¹ę§ćęćŖććŖćēÆå²ć§åæ č¦ć«åæććę·»å ććććØćć§ććććć ććļ¼“ļ½ćļ¼ŗļ½ćļ¼®ļ½ćļ¼·ćļ¼¬ļ½ćļ¼§ļ½ćļ¼¹ćļ¼¹ļ½ćļ¼¬ļ½ćé¤ććļ¼®ļ½ćļ¼¶ćļ¼£ļ½ćļ¼ļ½ćļ¼¦ļ½ ćļ¼£ļ½ćļ¼®ļ½ćļ¼£ļ½ćļ¼”ļ½åć³ļ¼ļ½ēć®åé·ē§»éå±ęåćÆććććććåē¬åćÆč¤åćć¦å°éå«ęććå “åć§ćć¬ć©ć¹ćēč²ććåÆč¦åć®ē¹å®ć®ę³¢é·ć«åøåćēććę§č³Ŗććććććē¹ć«åÆč¦é åć®ę³¢é·ćä½æēØććå å¦ć¬ć©ć¹ć«ććć¦ćÆćå®č³Ŗēć«å«ć¾ćŖćććØć儽ć¾ććć Other components may be added as necessary within a range that does not impair the properties of the glass of the present invention. However, each transition metal component such as Nd, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo, excluding Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, is Even if a small amount of these substances is contained singly or in combination, the glass will be colored and have the property of absorbing specific wavelengths in the visible range. is preferred.
ć¾ććļ¼°ļ½ļ¼Æēć®éååē©åć³ļ¼”ļ½ļ¼ļ¼Æļ¼ēć®ē ē“ ååē©ćÆćē°å¢č² č·ćé«ćęåć§ćććććå®č³Ŗēć«å«ęććŖćććØćććŖćć”ćäøåÆéæćŖę··å „ćé¤ćć¦äøåå«ęććŖćććØćęć¾ććć Further, since lead compounds such as PbO and arsenic compounds such as As 2 O 3 are components with a high environmental load, it is desirable that they are substantially not contained, that is, not contained at all except for unavoidable contamination.
ććć«ćļ¼“ļ½ćļ¼£ļ½ćļ¼“ļ½ćļ¼Æļ½ćļ¼¢ļ½ ćåć³ļ¼³ļ½ ć®åęåćÆćčæ幓ę害ćŖåå¦ē©č³ŖćØćć¦ä½æēØćę§ććå¾åć«ćććć¬ć©ć¹ć®č£½é å·„ēØć®ćæćŖćććå å·„å·„ēØćåć³č£½ååå¾ć®å¦åć«č³ćć¾ć§ē°å¢åƾēäøć®ęŖē½®ćåæ č¦ćØććććå¾ć£ć¦ćē°å¢äøć®å½±éæćéč¦ććå “åć«ćÆćććććå®č³Ŗēć«å«ęććŖćććØć儽ć¾ććć Furthermore, the use of Th, Cd, Tl, Os, Be, and Se as harmful chemical substances has tended to be avoided in recent years, and they are used not only in the glass manufacturing process but also in the processing process and disposal after product production. Environmental measures are required throughout. Therefore, when placing importance on the environmental impact, it is preferable not to substantially contain these.
ę¬ēŗęć®å å¦ć¬ć©ć¹ćÆćéå å¤ćę·»å ććććØćē¹å¾“ćØćććéå å¤ćę·»å ććććØć«ćććć¬ć©ć¹äøćøć®ē½éę··å „ćęććééēćåäøćććććØćć§ćććéå å¤ć®å«ęéćÆå¤å²ćć§ć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćććć«å„½ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććäøę¹ćéå å¤ć®å«ęéćÆå¤å²ćć§ć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøććć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćęć儽ć¾ćććÆļ¼ļ¼ļ¼ļ¼ 仄äøćäøéćØćććéå å¤ćØćć¦ćÆćä¾ćć°ćć«ć¼ćć³ćļ¼³ēć®åå ē“ ćć¹ćÆćć¼ć¹ēć®ęę©ååē©ćć¾ććē”«é øć¢ć³ć¢ćć¦ć ēć®ē±åč§£ęć«éå ę§ć¬ć¹ćēŗēćććåęćęććććć The optical glass of the present invention is characterized by adding a reducing agent. By adding a reducing agent, platinum incorporation into the glass can be suppressed and transmittance can be improved. The upper limit of the content of the reducing agent is preferably 3.0% or less, more preferably 2.0% or less, still more preferably 1.0% or less, and most preferably 0.8% or less. On the other hand, the content of the reducing agent is preferably 0.01% or more, more preferably 0.05% or more, more preferably 0.1% or more, even more preferably 0.2% or more, and most preferably The lower limit is 0.3% or more. Examples of the reducing agent include single elements such as carbon and S, organic compounds such as sucrose, and raw materials that generate reducing gas upon thermal decomposition such as ammonium sulfate.
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The optical glass of the present invention is characterized by adding chlorine. In optical glasses that often use platinum crucibles, chlorine reacts with platinum to form platinum chloride, which is a component that actually increases the amount of platinum.
In the present invention, by adding chlorine together with a reducing agent, it is possible to suppress the generation of fine bubbles while suppressing the contamination of platinum. The content of chlorine is preferably 2.0% or less, more preferably 1.0% or less, still more preferably 0.5% or less, still more preferably 0.4% or less, and most preferably 0.3%. The upper limit is % or less. On the other hand, the content of chlorine is preferably 0.01% or more, more preferably 0.03% or more, more preferably 0.05% or more, more preferably 0.08% or more, and most preferably 0. .1% or more is the lower limit. By adjusting the chlorine content, fine bubbles can be reduced without affecting the optical properties or transmittance Ī»70 . Chlorine is not particularly limited, but examples include chloride raw materials and chloride gas.
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[Production method]
The optical glass of the present invention is produced, for example, as follows. That is, the above-mentioned raw materials are uniformly mixed so that each component is within a predetermined content range, the prepared mixture is put into a platinum crucible, and a known glass material is mixed according to the difficulty of melting the glass raw materials and the melting scale. What is necessary is just to produce it according to a manufacturing method. The timing of adding the reducing agent and chlorine includes a method of adding them as raw materials, and a method of creating a reducing atmosphere or chlorine bubbling during the melting process of glass raw materials.
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[Physical properties]
The optical glass of the present invention preferably has a refractive index (n d ) of 1.75000 or more. The lower limit of the refractive index (n d ) of the glass of the present invention is preferably 1.75000 or more, more preferably 1.80000 or more, still more preferably 1.85000 or more. The upper limit of this refractive index (n d ) is preferably 2.10000 or less, more preferably 2.07000 or less, still more preferably 2.05000 or less. Further, the lower limit of the Abbe number (v d ) of the glass of the present invention is preferably 20.00 or more, more preferably 23.00 or more, and still more preferably 25.00 or more. The upper limit of this Abbe number (v d ) is preferably 45.00 or less, more preferably 40.00 or less, and even more preferably 37.00 or less.
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It is preferable that the optical glass of the present invention has a high visible light transmittance, particularly a high transmittance of light on the short wavelength side of visible light, and thereby has little coloring.
The shortest wavelength (Ī» 70 ) at which a 10 mm thick sample of the glass of the present invention exhibits spectral transmittance is preferably 470 nm or less, more preferably 450 nm or less, still more preferably 430 nm or less, and even more preferably 420 nm or less. shall be.
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It is preferable that the optical glass of the present invention has a small amount of platinum and therefore has little coloring.
In particular, the upper limit of the amount of platinum in the optical glass of the present invention is preferably 8 ppm or less, more preferably 7 ppm or less, and still more preferably 6 ppm or less. This suppresses coloring due to platinum and increases the transparency of the glass to visible light, so that this optical glass can be preferably used for optical elements such as lenses that transmit light.
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The optical glass of the present invention is characterized by having few microbubbles. In the present invention, fine bubbles refer to bubbles less than 30 Ī¼m in diameter.
In particular, the number of fine bubbles in the optical glass of the present invention is preferably 53.5 or less, more preferably 45.0 or less, even more preferably 35.0 or less, and even more preferably 25.0 or less. . The number of fine bubbles is calculated using a glass measuring 1.4 cm long x 2.4 cm wide x 1.0 cm thick. This makes it possible to suppress deterioration of internal quality, so that this optical glass can be preferably used for optical elements that transmit light, such as lenses.
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[Preform and optical element]
A glass molded body can be produced from the produced optical glass using, for example, a polishing method or a mold press forming method such as reheat press molding or precision press molding. That is, mechanical processing such as grinding and polishing is performed on optical glass to produce a glass molded body, or a preform for mold press molding is produced from optical glass, and this preform is subjected to reheat press molding. After that, a glass molded body is produced by polishing, or a glass molded body is produced by performing precision press molding on a preform produced by polishing, or a preform molded by known levitation molding, etc. can be created. Note that the means for producing the glass molded body are not limited to these means.
ćć®ććć«ćę¬ēŗęć®å å¦ć¬ć©ć¹ćÆćę§ć ćŖå å¦ē“ ååć³å å¦čØčØć«ęēØć§ććććć®äøć§ćē¹ć«ćę¬ēŗęć®å å¦ć¬ć©ć¹ććććŖćć©ć¼ć ćå½¢ęćććć®ććŖćć©ć¼ć ćēØćć¦ćŖćć¼ććć¬ć¹ęå½¢ćē²¾åÆćć¬ć¹ęå½¢ēćč”ććć¬ć³ćŗćććŖćŗć ēć®å å¦ē“ åćä½č£½ććććØć儽ć¾ćććććć«ćććå¾ć®å¤§ććŖććŖćć©ć¼ć ć®å½¢ęćåÆč½ć«ćŖććććå å¦ē“ åć®å¤§ååćå³ććŖććććć«ć”ć©ććććøć§ćÆćæēć®å å¦ę©åØć«ēØćććØćć«é«ē²¾ē“°ć§é«ē²¾åŗ¦ćŖēµåē¹ę§åć³ęå½±ē¹ę§ćå®ē¾ć§ććć Thus, the optical glass of the present invention is useful for various optical elements and optical designs. Among these, it is particularly preferable to form a preform from the optical glass of the present invention and perform reheat press molding, precision press molding, etc. using this preform to produce optical elements such as lenses and prisms. This makes it possible to form preforms with large diameters, so even though the optical elements are larger, they still have high-definition and high-precision imaging and projection characteristics when used in optical equipment such as cameras and projectors. can be realized.
ę¬ēŗęć®ć¬ć©ć¹ć®å®ę½ä¾åć³ęÆč¼ä¾ć®ēµęćäø¦ć³ć«ććććć®ć¬ć©ć¹ć®å±ęēļ¼ļ½ļ½ļ¼ćć¢ććę°ļ¼Ī½ļ½ļ¼ćåå ééēćļ¼ļ¼ļ¼ åć³ļ¼ļ¼ ćē¤ŗćę³¢é·ļ¼Ī»ļ¼ļ¼ćĪ»ļ¼ļ¼ć®ēµęćć¬ć©ć¹äøć®ē½ééļ¼ļ½ļ½ļ½ļ¼ćåć³ćć¬ć©ć¹äøć®ę³”ļ¼ę°ę³”ļ¼ć®ęø¬å®å¤ćč”Øć«ē¤ŗćć仄äøć®å®ę½ä¾ćÆććć¾ć§ä¾ē¤ŗć®ē®ēć§ććććććć®å®ę½ä¾ć«ć®ćæéå®ććććć®ć§ćÆćŖćć Compositions of Examples and Comparative Examples of glasses of the present invention, refractive index (n d ), Abbe number (Ī½ d ), and wavelengths (Ī» 70 , Ī» As a result of 5 ), the amount of platinum (ppm) in the glass and the measured values of bubbles (bubbles) in the glass are shown in the table. The following examples are for illustrative purposes only and are not intended to be limiting.
ę¬ēŗęć®å®ę½ä¾åć³ęÆč¼ä¾ć®ć¬ć©ć¹ćÆćććććåęåć®åęćØćć¦åć ēøå½ććé øåē©ćę°“é øåē©ćēé ø唩ćē”é ø唩ćå¼åē©ćć”ćæēé øååē©ēć®éåøøć®å å¦ć¬ć©ć¹ć«ä½æēØćććé«ē“åŗ¦åęćéå å¤ććć³å”©åē©åęćéøå®ććč”Øć«ē¤ŗććåå®ę½ä¾ć®ēµęććć³éå å¤ć唩ē“ ć®å²åć«ćŖćććć«ē§¤éćć¦ćåäøć«ę··åććå¾ćē½éå©å ć«ęå „ććć¬ć©ć¹åęć®ēč§£é£ęåŗ¦ć«åæćć¦é»ę°ēć§ļ¼ļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ¼āć®ęø©åŗ¦ēÆå²ć§ļ¼ļ¼åļ½ļ¼ęéēč§£ćććå¾ćęŖęåč³Ŗåćć¦ććéåēć«é³č¾¼ćæćå¾å·ćć¦ä½č£½ććć The glasses of Examples and Comparative Examples of the present invention are both used in ordinary optical glasses containing corresponding oxides, hydroxides, carbonates, nitrates, fluorides, metaphosphoric acid compounds, etc. as raw materials for each component. High-purity raw materials, reducing agents, and chloride raw materials were selected, weighed so as to have the composition, reducing agent, and chlorine proportions of each example shown in the table, mixed uniformly, and then placed in a platinum crucible. Depending on the difficulty of melting the glass raw material, it was melted in an electric furnace at a temperature range of 1100 to 1500Ā°C for 30 minutes to 2 hours, stirred to homogenize, poured into a mold, etc., and slowly cooled.
ę¬ēŗęć®ć¬ć©ć¹ć®å®ę½ä¾åć³ęÆč¼ä¾ć«ćÆćéå å¤ć唩ē“ ćē”«é øćč”Øć«ē¤ŗććéćę·»å ćć¦ćććććć§ćÆćē”«é øćÆč±ę³”å¤ćØćć¦ć®å½¹å²ćę ć£ć¦ććć In the Examples and Comparative Examples of the glasses of the present invention, reducing agents, chlorine, and sulfuric acid were added in the amounts shown in the table. Here, sulfuric acid plays the role of a defoaming agent.
å®ę½ä¾åć³ęÆč¼ä¾ć®ć¬ć©ć¹ć®å±ęēļ¼ļ½ļ½ļ¼ćÆćļ¼Ŗļ¼©ļ¼³ ļ¼¢ ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ć«č¦å®ćććļ¼¶ććććÆę³ć«ęŗćć¦ćććŖć¦ć ć©ć³ćć®ļ½ē·ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ½ļ½ļ¼ć«åƾććęø¬å®å¤ć§ē¤ŗćććć¾ććć¢ććę°ļ¼Ī½ļ½ļ¼ćÆćäøčØļ½ē·ć®å±ęēćØćę°“ē“ ć©ć³ćć®ļ¼¦ē·ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ½ļ½ļ¼ć«åƾććå±ęēļ¼ļ½ļ¼¦ļ¼ćļ¼£ē·ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ½ļ½ļ¼ć«åƾććå±ęēļ¼ļ½ļ¼£ļ¼ć®å¤ćēØćć¦ćć¢ććę°ļ¼Ī½ļ½ļ¼ļ¼[ļ¼ļ½ļ½ļ¼ļ¼ļ¼ļ¼ļ¼ļ½ļ¼¦ļ¼ļ½ļ¼£ļ¼]ć®å¼ććē®åŗćććććć¦ćę±ććććå±ęēļ¼ļ½ļ½ļ¼åć³ć¢ććę°ļ¼Ī½ļ½ļ¼ć®å¤ćććé¢äæå¼ļ½ļ½ļ¼ļ¼ļ½ĆĪ½ļ½ļ¼ļ½ć«ććććå¾ćļ½ćļ¼ļ¼ļ¼ļ¼ć®ćØćć®åēļ½ćę±ććć The refractive index (n d ) of the glasses of Examples and Comparative Examples was shown as a value measured against the d-line (587.56 nm) of a helium lamp in accordance with the V block method specified in JIS B 7071-2:2018. . In addition, the Abbe number (Ī½ d ) is the refractive index of the above d-line, the refractive index (n F ) for the F-line (486.13 nm) of the hydrogen lamp, and the refractive index (n C ) for the C-line (656.27 nm). It was calculated from the formula of Abbe number (Ī½ d )=[( nd ā1)/(n F ān C )] using the value of . Then, from the values of the determined refractive index (n d ) and Abbe number (Ī½ d ), the intercept b in the relational expression nd = āaĆĪ½ d +b when the slope a is 0.01 was determined.
å®ę½ä¾åć³ęÆč¼ä¾ć®ć¬ć©ć¹ć®ééēćÆćę„ę¬å å¦ē”åå·„ę„ä¼č¦ę ¼ļ¼Ŗļ¼Æļ¼§ļ¼©ļ¼³ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ć«ęŗćć¦ęø¬å®ććććŖććę¬ēŗęć«ććć¦ćÆćć¬ć©ć¹ć®ééēćęø¬å®ććććØć§ćć¬ć©ć¹ć®ēč²ć®ęē”ćØēØåŗ¦ćę±ćććå ·ä½ēć«ćÆćåćļ¼ļ¼Ā±ļ¼ļ¼ļ¼ļ½ļ½ć®åƾé¢å¹³č”ē ē£Øåćļ¼Ŗļ¼©ļ¼³ļ¼ŗļ¼ļ¼ļ¼ļ¼ć«ęŗććļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ½ļ½ć®åå ééēćęø¬å®ććå ē·ééēļ¼åå ééēļ¼ćĪ»ļ¼ļ¼ļ¼ééēļ¼ļ¼ļ¼ ęć®ę³¢é·ļ¼ćę±ććć The transmittance of the glasses of Examples and Comparative Examples was measured according to the Japan Optical Glass Industry Association standard JOGIS02-2003. In the present invention, the presence or absence and degree of coloring of the glass was determined by measuring the transmittance of the glass. Specifically, according to JIS Z8722, the spectral transmittance of 200 to 800 nm was measured for a parallel-polished product with a thickness of 10 Ā± 0.1 mm, and the light transmittance (spectral transmittance), Ī» 70 (when transmittance was 70%) was measured. wavelength) was determined.
å®ę½ä¾åć³ęÆč¼ä¾ć®ć¬ć©ć¹äøć®ē½ééļ¼ļ½ļ½ļ½ļ¼ćÆćļ¼©ļ¼£ļ¼°ļ¼ļ¼ļ¼³ļ¼čŖå°ēµåćć©ćŗćč³ŖéåęčØļ¼ćä½æēØććęø¬å®ćč”ć£ćć The amount of platinum (ppm) in the glasses of Examples and Comparative Examples was measured using an ICP-MS (inductively coupled plasma mass spectrometer).
å®ę½ä¾åć³ęÆč¼ä¾ć®ć¬ć©ć¹äøć®ę³”ć®ęø¬å®ćÆćę„ę¬å å¦ē”åå·„ę„ä¼č¦ę ¼ļ¼Ŗļ¼Æļ¼§ļ¼©ļ¼³ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ļ¼ćå å¦ć¬ć©ć¹ć®ę³”ć®ęø¬å®ę¹ę³ćć«åŗć„ćć¦č”ć£ćć The measurement of bubbles in the glass in Examples and Comparative Examples was performed based on the Japan Optical Glass Industry Association standard JOGIS 12-2012 "Method for measuring bubbles in optical glass."
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ē“å¾ćļ¼ļ¼Ī¼ļ½ęŖęŗć®å¾®ē“°ćŖę³”ć®ę°ćļ¼ļ¼ļ¼ļ¼å仄äøć®ć¬ć©ć¹ćµć³ćć«ćÆććććå¾®ē“°ćŖę³”ć®ę°ćļ¼ļ¼ļ¼ļ¼åćč¶
ććć¬ć©ć¹ćµć³ćć«ćÆćĆććØćć¦ććć
The number of fine bubbles in the glass of Examples and Comparative Examples was determined using a stereomicroscope SZ61 manufactured by Olympus Corporation using a glass sample measuring 1.4 cm long x 2.4 cm wide x 1.0 cm thick. I did the calculations.
A glass sample in which the number of fine bubbles with a diameter of less than 30 Ī¼m is 53.5 or less is marked as āāā, and a glass sample in which the number of fine bubbles exceeds 53.5 is marked as āĆā.
ę¬ēŗęć®å®ę½ä¾ć®ę¬ēŗęć®ć¬ć©ć¹ćÆćććććĪ»ļ¼ļ¼ļ¼ééēļ¼ļ¼ļ¼ ęć®ę³¢é·ļ¼ćļ¼ļ¼ļ¼ļ½ļ½ä»„äøć§ćć£ććććč©³ē“°ć«ćÆćę¬ēŗęć®å®ę½ä¾ć®ę¬ēŗęć®ć¬ć©ć¹ćÆćććććĪ»ļ¼ļ¼ļ¼ééēļ¼ļ¼ļ¼ ęć®ę³¢é·ļ¼ćļ¼ļ¼ļ¼ļ½ļ½ä»„äøć ć£ććäøę¹ć§ć唩ē“ ć®ćæćå«ęćć¦ććęÆč¼ä¾ļ¼¢ć®ć¬ć©ć¹ćÆćĪ»ļ¼ļ¼ćļ¼ļ¼ļ¼ļ½ļ½ćć大ććć£ćććć®ćććę¬ēŗęć®å®ę½ä¾ć®å å¦ć¬ć©ć¹ćÆćęÆč¼ä¾ć®ć¬ć©ć¹ć«ęÆć¹ć¦ēč²ćé£ćććØćęććć«ćŖć£ćć All of the glasses of the present invention in Examples of the present invention had a Ī» 70 (wavelength at 70% transmittance) of 450 nm or less. More specifically, all of the glasses of the present invention in Examples of the present invention had a Ī» 70 (wavelength at 70% transmittance) of 420 nm or less. On the other hand, the glass of Comparative Example B containing only chlorine had a Ī» 70 greater than 450 nm. Therefore, it became clear that the optical glass of the example of the present invention was less likely to be colored than the glass of the comparative example.
ę¬ēŗęć®å®ę½ä¾ć®å å¦ć¬ć©ć¹ćÆćććććē½ééćļ¼ļ½ļ½ļ½ä»„äøć ć£ććäøę¹ć§ć唩ē“ ć®ćæćå«ęćć¦ććęÆč¼ä¾ļ¼¢ć®ć¬ć©ć¹ćÆćē½ééćļ¼ļ½ļ½ļ½ćč¶ ćććć®ć ć£ćććć®ćććę¬ēŗęć®å®ę½ä¾ć®ć¬ć©ć¹ćÆęÆč¼ä¾ć®ć¬ć©ć¹ć«ęÆć¹ć¦ē½ééćå°ćŖćććØćęććć«ćŖć£ćć The optical glasses of Examples of the present invention all had a platinum content of 8 ppm or less. On the other hand, the glass of Comparative Example B containing only chlorine had a platinum content exceeding 8 ppm. Therefore, it became clear that the glasses of Examples of the present invention contained less platinum than the glasses of Comparative Examples.
ę¬ēŗęć®å®ę½ä¾ć®å å¦ć¬ć©ć¹ćÆćććććę³”č©ä¾”ćļ¼ē“ć§ććććę¬ēŗęć®å®ę½ä¾ć®å å¦ć¬ć©ć¹ćÆćęÆč¼ä¾ć®ć¬ć©ć¹ć«ęÆć¹ć¦å¾®ē“°ćŖę³”ćå°ćŖććććå éØåč³ŖćčÆćć¬ć©ć¹ć§ććććØćęććć«ćŖć£ćć The optical glasses of the examples of the present invention all have a bubble evaluation of grade 1, but the optical glasses of the examples of the present invention have fewer fine bubbles than the glasses of the comparative examples, so they have good internal quality. It became clear that.
å¾ć£ć¦ćę¬ēŗęć®å®ę½ä¾ć®å å¦ć¬ć©ć¹ćÆćéå å¤åć³å”©ē“ ćę·»å ććććØć«ćć£ć¦ćć¬ć©ć¹ćēč§£ććéēØć§é øåćć¦ć¬ć©ć¹äøć«ęŗ¶ćåŗććē½éć«ććć¬ć©ć¹ć®ēč²ćęå¶ććŖćććå¾®ē“°ćŖę³”ć®ēŗēćęå¶ćććććØćęććć«ćŖć£ćć Therefore, by adding a reducing agent and chlorine to the optical glass of the embodiment of the present invention, the coloring of the glass due to platinum oxidized and dissolved into the glass during the process of melting the glass can be suppressed, and fine bubbles can be suppressed. It was revealed that the occurrence of was suppressed.
仄äøćę¬ēŗęćä¾ē¤ŗć®ē®ēć§č©³ē“°ć«čŖ¬ęććććę¬å®ę½ä¾ćÆććć¾ć§ä¾ē¤ŗć®ē®ēć®ćæć§ćć£ć¦ćę¬ēŗęć®ęę³åć³ēÆå²ćéøč±ććććØćŖćå¤ćć®ę¹å¤ćå½ę„č ć«ććęćå¾ćććØćēč§£ććććć Although the present invention has been described in detail above for the purpose of illustration, this embodiment is only for the purpose of illustration, and many modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention. will be understood.
Claims (4)
åčØć¬ć©ć¹åęćÆćé øåē©ęē®ć®č³Ŗéļ¼ ć§ć
ļ¼¬ļ½2ļ¼Æ3ęåćļ¼ļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ¼ļ¼ ć
ļ¼¢2ļ¼Æ3ęåćļ¼ļ¼ļ¼ļ½ļ¼ļ¼ļ¼ļ¼ļ¼
å«ęćć
ļ¼“ļ½ļ¼Æ 2 ęåćļ¼®ļ½ 2 ļ¼Æ 5 ęåćļ¼·ļ¼Æ 3 ęåćå°ćŖććØćäøć¤ä»„äøå«ęććč³Ŗéåļ¼“ļ½ļ¼Æ 2 ļ¼ļ¼®ļ½ 2 ļ¼Æ 5 ļ¼ļ¼·ļ¼Æ 3 ćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć§ććć
éå å¤åć³å”©ē“ ćę·»å ććććØćē¹å¾“ćØćććå å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć A method for producing optical glass by melting glass raw materials, the method comprising:
The glass raw material is mass % in terms of oxide,
La 2 O 3 component 30.0 to 65.0%,
B 2 O 3 component 3.0 to 15.0 %
Contains
Contains at least one of TiO 2 component, Nb 2 O 5 component, and WO 3 component, and the mass sum TiO 2 +Nb 2 O 5 +WO 3 is 15.5% or more and 35.0% or less,
A method for producing optical glass, characterized by adding a reducing agent and chlorine.
ļ¼³ļ½ļ¼Æ2ęåćļ¼ļ¼ļ¼ļ¼ļ¼ 仄äøć§ććć
č«ę±é ļ¼ć«čØč¼ć®å å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć The glass raw material is mass % in terms of oxide,
The SiO 2 component is 20.0% or less,
The method for manufacturing optical glass according to claim 1.
č«ę±é ļ¼åćÆļ¼ć«čØč¼ć®å å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć characterized in that the chlorine is added in an amount of 0.01% or more,
The method for manufacturing optical glass according to claim 1 or 2.
č«ę±é ļ¼ļ½ļ¼ć«čØč¼ć®å å¦ć¬ć©ć¹ć®č£½é ę¹ę³ć The optical glass has a platinum content of 8 ppm or less,
A method for producing optical glass according to claims 1 to 3.
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| WO2007058185A1 (en) | 2005-11-15 | 2007-05-24 | Isuzu Glass Co., Ltd. | Blue-violet light blocking glass |
| JP2007153734A (en) | 2005-12-07 | 2007-06-21 | Schott Ag | Optical glass |
| JP2008532910A (en) | 2005-03-18 | 2008-08-21 | ćøć„ć¼ćāćć§ćć¼ ć¢ćÆćć§ć³ć²ć¼ć«ć·ć£ćć | Circulation method for producing lithium metal phosphate by wet chemical method |
| JP2009263190A (en) | 2008-04-29 | 2009-11-12 | Ohara Inc | Infrared absorption glass |
| JP2011088897A (en) | 1999-06-28 | 2011-05-06 | Genentech Inc | Method for making apo-2 ligand using divalent metal ion |
| JP2016074558A (en) | 2014-10-06 | 2016-05-12 | ę Ŗå¼ä¼ē¤¾ćŖćć© | Optical glass and optical element |
| WO2019142936A1 (en) | 2018-01-22 | 2019-07-25 | ļ¼”ļ½ļ½ę Ŗå¼ä¼ē¤¾ | Ultraviolet ray-transmitting glass and molded article |
-
2020
- 2020-08-26 JP JP2020142987A patent/JP7429622B2/en active Active
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2021
- 2021-08-25 CN CN202110979983.8A patent/CN114105470A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011088897A (en) | 1999-06-28 | 2011-05-06 | Genentech Inc | Method for making apo-2 ligand using divalent metal ion |
| JP2008532910A (en) | 2005-03-18 | 2008-08-21 | ćøć„ć¼ćāćć§ćć¼ ć¢ćÆćć§ć³ć²ć¼ć«ć·ć£ćć | Circulation method for producing lithium metal phosphate by wet chemical method |
| WO2007058185A1 (en) | 2005-11-15 | 2007-05-24 | Isuzu Glass Co., Ltd. | Blue-violet light blocking glass |
| JP2007153734A (en) | 2005-12-07 | 2007-06-21 | Schott Ag | Optical glass |
| JP2009263190A (en) | 2008-04-29 | 2009-11-12 | Ohara Inc | Infrared absorption glass |
| JP2016074558A (en) | 2014-10-06 | 2016-05-12 | ę Ŗå¼ä¼ē¤¾ćŖćć© | Optical glass and optical element |
| WO2019142936A1 (en) | 2018-01-22 | 2019-07-25 | ļ¼”ļ½ļ½ę Ŗå¼ä¼ē¤¾ | Ultraviolet ray-transmitting glass and molded article |
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| JP2022038465A (en) | 2022-03-10 |
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