JP2017007944A - Optical glass and optical element - Google Patents
Optical glass and optical element Download PDFInfo
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- JP2017007944A JP2017007944A JP2016194370A JP2016194370A JP2017007944A JP 2017007944 A JP2017007944 A JP 2017007944A JP 2016194370 A JP2016194370 A JP 2016194370A JP 2016194370 A JP2016194370 A JP 2016194370A JP 2017007944 A JP2017007944 A JP 2017007944A
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- 239000005304 optical glass Substances 0.000 title claims abstract description 108
- 230000003287 optical effect Effects 0.000 title claims description 38
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 15
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 14
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 10
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 10
- 229910005793 GeO 2 Inorganic materials 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 8
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 claims description 8
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 4
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 229910052792 caesium Inorganic materials 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 3
- 239000011521 glass Substances 0.000 abstract description 129
- 238000004031 devitrification Methods 0.000 abstract description 43
- 239000000203 mixture Substances 0.000 abstract description 16
- 239000002994 raw material Substances 0.000 description 35
- 239000006185 dispersion Substances 0.000 description 23
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 19
- 238000002834 transmittance Methods 0.000 description 19
- 238000000465 moulding Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 12
- 230000005484 gravity Effects 0.000 description 12
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 239000006060 molten glass Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910052697 platinum Inorganic materials 0.000 description 9
- 238000004040 coloring Methods 0.000 description 8
- 230000009477 glass transition Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000005498 polishing Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 206010040925 Skin striae Diseases 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- -1 Al (OH) 3 Inorganic materials 0.000 description 1
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229910005690 GdF 3 Inorganic materials 0.000 description 1
- 229910013553 LiNO Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910004844 Na2B4O7.10H2O Inorganic materials 0.000 description 1
- 229910008449 SnF 2 Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 150000001495 arsenic compounds Chemical class 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 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
- 239000013530 defoamer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 229940093920 gynecological arsenic compound Drugs 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
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 125000005341 metaphosphate group Chemical group 0.000 description 1
- 238000002156 mixing Methods 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
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(II) oxide Inorganic materials [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 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
- 239000013585 weight reducing agent Substances 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
本発明は、光学ガラス及び光学素子に関する。 The present invention relates to an optical glass and an optical element.
近年、光学系を使用する機器のデジタル化や高精細化が急速に進んでおり、デジタルカメラやビデオカメラ等の撮影機器や、プロジェクタやプロジェクションテレビ等の画像再生（投影）機器等の各種光学機器の分野では、光学系で用いられるレンズやプリズム等の光学素子の枚数を削減し、光学系全体を軽量化及び小型化する要求が強まっている。 In recent years, digitization and high definition of devices using optical systems have been rapidly progressing, and various optical devices such as photographing devices such as digital cameras and video cameras, and image reproduction (projection) devices such as projectors and projection televisions. In this field, there is an increasing demand to reduce the number of optical elements such as lenses and prisms used in the optical system, and to reduce the weight and size of the entire optical system.
光学素子を作製する光学ガラスの中でも特に、光学系全体の軽量化及び小型化を図ることが可能な、１．７５以上の屈折率（ｎｄ）を有し、３５以上５０以下のアッベ数（νｄ）を有する高屈折率低分散ガラスの需要が非常に高まっている。このような高屈折率低分散ガラスとしては、特許文献１〜３に代表されるようなガラス組成物が知られている。 Among optical glasses for producing optical elements, in particular, it has a refractive index (n d ) of 1.75 or more and an Abbe number of 35 or more and 50 or less (which can reduce the weight and size of the entire optical system). There is a great demand for high refractive index, low dispersion glass with ν d ). As such a high refractive index and low dispersion glass, glass compositions represented by Patent Documents 1 to 3 are known.
光学ガラスから光学素子を作製する方法としては、例えば、光学ガラスから形成されたゴブ又はガラスブロックに対して研削及び研磨を行って光学素子の形状を得る方法、光学ガラスから形成されたゴブ又はガラスブロックを再加熱して成形（リヒートプレス成形）して得られたガラス成形体を研削及び研磨する方法、及び、ゴブ又はガラスブロックから得られたプリフォーム材を超精密加工された金型で成形（精密モールドプレス成形）して光学素子の形状を得る方法が知られている。いずれの方法であっても、熔融したガラス原料からゴブ又はガラスブロックを形成する際に、安定なガラスが得られることが求められる。ここで、得られるゴブ又はガラスブロックを構成するガラスの失透に対する安定性（耐失透性）が低下してガラスの内部に結晶が発生した場合、もはや光学素子として好適なガラスを得ることができない。 As a method for producing an optical element from optical glass, for example, a gob or glass block formed from optical glass is ground and polished to obtain the shape of the optical element, or a gob or glass formed from optical glass. A method of grinding and polishing a glass molded product obtained by reheating and molding a block (reheat press molding), and molding a preform material obtained from a gob or glass block with an ultra-precision machined mold A method of obtaining the shape of an optical element by (precise mold press molding) is known. Any method is required to obtain a stable glass when a gob or glass block is formed from a molten glass raw material. Here, when the stability (devitrification resistance) with respect to devitrification of the glass which comprises the gob or glass block obtained falls and a crystal | crystallization generate | occur | produces inside glass, it can no longer obtain glass suitable as an optical element Can not.
また、光学ガラスの材料コストを低減するために、光学ガラスを構成する諸成分の原料費は、なるべく安価であることが望まれる。また、光学ガラスの製造コストを低減するため、原料の熔解性が高く、より低温で熔解することが望まれる。ところが、特許文献１〜４に記載されたガラスは、これらの諸要求に十分応えるものとは言い難い。 In addition, in order to reduce the material cost of the optical glass, it is desirable that the raw material costs of the components constituting the optical glass be as low as possible. Moreover, in order to reduce the manufacturing cost of optical glass, it is desired that the raw material has high meltability and is melted at a lower temperature. However, it is difficult to say that the glasses described in Patent Documents 1 to 4 sufficiently satisfy these various requirements.
本発明は、上記問題点に鑑みてなされたものであって、その目的とするところは、屈折率（ｎｄ）及びアッベ数（νｄ）が所望の範囲内にありながら、耐失透性が高いガラスを、より安価に得ることにある。 The present invention has been made in view of the above problems, and its object is to provide resistance to devitrification while the refractive index (n d ) and Abbe number (ν d ) are within the desired ranges. It is to obtain a glass having a high price at a lower cost.
本発明者らは、上記課題を解決するために、鋭意試験研究を重ねた結果、Ｂ２Ｏ３成分及びＬａ２Ｏ３成分を含有し、３５以上のアッベ数（νｄ）を有するガラスに対してＴａ２Ｏ５成分の含有量を低減することにより、所望の屈折率及びアッベ数を有しながらもガラスの材料コストが低減され、且つガラスの液相温度が低くなることを見出し、本発明を完成するに至った。具体的には、本発明は以下のようなものを提供する。 In order to solve the above-mentioned problems, the present inventors have conducted extensive test studies. As a result, the present inventors have developed a glass containing B 2 O 3 component and La 2 O 3 component and having an Abbe number (ν d ) of 35 or more. On the other hand, by reducing the content of Ta 2 O 5 component, it has been found that the material cost of glass is reduced while having the desired refractive index and Abbe number, and the liquidus temperature of the glass is lowered. The invention has been completed. Specifically, the present invention provides the following.
（１） 質量％でＢ２Ｏ３成分を１．０〜３０．０％及びＬａ２Ｏ３成分を１０．０〜６０．０％含有し、３５以上のアッベ数（νｄ）を有し、Ｔａ２Ｏ５成分の含有量が１５．０％未満である光学ガラス。 (1) Containing 1.0 to 30.0% of B 2 O 3 component and 10.0 to 60.0% of La 2 O 3 component by mass%, and having an Abbe number (ν d ) of 35 or more An optical glass having a Ta 2 O 5 content of less than 15.0%.
（２） 質量％で
Ｌｉ２Ｏ成分 ０〜１０．０％
ＺｎＯ成分 ０〜２５．０％
である（１）記載の光学ガラス。
(2) Li 2 O component in mass% 0 to 10.0%
ZnO component 0 to 25.0%
The optical glass according to (1).
（３） 質量％で
Ｇｄ２Ｏ３成分 ０〜４０．０％
Ｙ２Ｏ３成分 ０〜３０．０％
Ｙｂ２Ｏ３成分 ０〜２０．０％
である（１）又は（２）記載の光学ガラス。
(3) Gd 2 O 3 component by mass% 0 to 40.0%
Y 2 O 3 component 0 to 30.0%
Yb 2 O 3 component 0 to 20.0%
The optical glass according to (1) or (2).
（４） Ｌｎ２Ｏ３成分（式中、ＬｎはＬａ、Ｇｄ、Ｙ、Ｙｂからなる群より選択される１種以上）の質量和が３５．０％以上７５．０％以下である（１）から（３）のいずれか記載の光学ガラス。 (4) The mass sum of the Ln 2 O 3 component (wherein Ln is one or more selected from the group consisting of La, Gd, Y, and Yb) is 35.0% to 75.0% (1 ) To (3).
（５） Ｇｄ２Ｏ３成分、Ｙｂ２Ｏ３成分及びＴａ２Ｏ５成分の含有量の和が３０．０％以下である（１）から（４）のいずれかに記載の光学ガラス。 (5) The optical glass according to any one of (1) to (4), wherein the sum of the contents of the Gd 2 O 3 component, the Yb 2 O 3 component, and the Ta 2 O 5 component is 30.0% or less.
（６） 質量％で
ＴｉＯ２成分 ０〜１５．０％
Ｎｂ２Ｏ５成分 ０〜２０．０％
ＷＯ３成分 ０〜２０．０％
である（１）から（５）のいずれかに記載の光学ガラス。
(6) TiO 2 component by mass% 0 to 15.0%
Nb 2 O 5 component 0 to 20.0%
WO 3 component 0-20.0%
The optical glass according to any one of (1) to (5).
（７） ＴｉＯ２成分、Ｎｂ２Ｏ５成分及びＷＯ３成分の含有量の和が３０．０％以下である（１）から（６）のいずれかに記載の光学ガラス。 (7) The optical glass according to any one of (1) to (6), wherein the sum of the contents of the TiO 2 component, the Nb 2 O 5 component, and the WO 3 component is 30.0% or less.
（８） ＳｉＯ２成分の含有量が３０．０％以下である（１）から（７）のいずれかに記載の光学ガラス。 (8) The optical glass according to any one of the content of SiO 2 component is less than 30.0% from (1) (7).
（９） Ｂ２Ｏ３成分及びＳｉＯ２成分の含有量の和が１．０％以上３０．０％以下である（１）から（８）のいずれかに記載の光学ガラス。 (9) The optical glass according to any one of (1) to (8), wherein the sum of the contents of the B 2 O 3 component and the SiO 2 component is 1.0% or more and 30.0% or less.
（１０） 質量％で
Ｎａ２Ｏ成分 ０〜１０．０％
Ｋ２Ｏ成分 ０〜１０．０％
Ｃｓ２Ｏ成分 ０〜１０．０％
である（１）から（９）のいずれかに記載の光学ガラス。
(10) Na 2 O component in mass% 0 to 10.0%
K 2 O component 0 to 10.0%
Cs 2 O component 0 to 10.0%
The optical glass according to any one of (1) to (9).
（１１） Ｒｎ２Ｏ成分（式中、ＲｎはＬｉ、Ｎａ、Ｋ、Ｃｓからなる群より選択される１種以上）の質量和が１５．０％以下である（１）から（１０）のいずれかに記載の光学ガラス。 (11) The mass sum of the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is 15.0% or less, from (1) to (10) Optical glass in any one.
（１２） 質量％で
ＭｇＯ成分 ０〜１０．０％
ＣａＯ成分 ０〜１０．０％
ＳｒＯ成分 ０〜１０．０％
ＢａＯ成分 ０〜２５．０％
である（１）から（１１）のいずれかに記載の光学ガラス。
(12) MgO component in mass% 0 to 10.0%
CaO component 0 to 10.0%
SrO component 0 to 10.0%
BaO component 0 to 25.0%
The optical glass according to any one of (1) to (11).
（１３） ＲＯ成分（式中、ＲはＭｇ、Ｃａ、Ｓｒ、Ｂａからなる群より選択される１種以上）の質量和が２５．０％以下である（１）から（１２）のいずれかに記載の光学ガラス。 (13) The RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, and Ba) has a mass sum of 25.0% or less, and any one of (1) to (12) The optical glass described in 1.
（１４） 質量％で
Ｐ２Ｏ５成分 ０〜１０．０％
ＧｅＯ２成分 ０〜１０．０％
ＺｒＯ２成分 ０〜１５．０％
Ａｌ２Ｏ３成分 ０〜１０．０％
Ｇａ２Ｏ３成分 ０〜１０．０％
Ｂｉ２Ｏ３成分 ０〜１０．０％
ＴｅＯ２成分 ０〜２０．０％
ＳｎＯ２成分 ０〜１．０％
Ｓｂ２Ｏ３成分 ０〜１．０％
である（１）から（１３）のいずれか記載の光学ガラス。
(14)% by weight P 2 O 5 component from 0 to 10.0%
GeO 2 component 0-10.0%
ZrO 2 component 0 to 15.0%
Al 2 O 3 component 0 to 10.0%
Ga 2 O 3 component from 0 to 10.0%
Bi 2 O 3 component 0 to 10.0%
TeO 2 component 0-20.0%
SnO 2 component 0-1.0%
Sb 2 O 3 component 0-1.0%
The optical glass according to any one of (1) to (13).
（１５） １．７５以上の屈折率（ｎｄ）を有し、３５以上５０以下のアッベ数（νｄ）を有する（１）から（１４）のいずれか記載の光学ガラス。 (15) The optical glass according to any one of (1) to (14), having a refractive index (n d ) of 1.75 or more and an Abbe number (ν d ) of 35 to 50.
（１６） １３００℃以下の液相温度を有する（１）から（１５）のいずれか記載の光学ガラス。 (16) The optical glass according to any one of (1) to (15), which has a liquidus temperature of 1300 ° C. or lower.
（１７） （１）から（１６）のいずれか記載の光学ガラスを母材とする光学素子。 (17) An optical element having the optical glass according to any one of (1) to (16) as a base material.
（１８） （１７）記載の光学素子を備える光学機器。 (18) An optical apparatus comprising the optical element according to (17).
本発明によれば、屈折率（ｎｄ）及びアッベ数（νｄ）が所望の範囲内にありながら、耐失透性が高いガラスを、より安価に得ることができる。 According to the present invention, a glass having high devitrification resistance can be obtained at a lower cost while the refractive index (n d ) and Abbe number (ν d ) are within the desired ranges.
本発明の光学ガラスは、質量％でＢ２Ｏ３成分を１．０〜３０．０％及びＬａ２Ｏ３成分を１０．０〜６０．０％含有し、３５以上のアッベ数（νｄ）を有し、Ｔａ２Ｏ５成分の含有量が１５．０％未満である。Ｔａ２Ｏ５成分の含有量を低減することによって、高価であり且つ高温での熔解を要するＴａ２Ｏ５成分の使用量が減少するため、光学ガラスの原料コスト及び製造コストが低減される。それとともに、Ｂ２Ｏ３成分及びＬａ２Ｏ３成分をベースとすることにより、３５以上のアッベ数（νｄ）を有しながらも、液相温度が低くなり易くなる。このため、屈折率（ｎｄ）及びアッベ数（νｄ）が所望の範囲内にありながら、耐失透性が高い光学ガラスと、これを用いた光学素子をより安価に得ることができる。 The optical glass of the present invention contains 1.0 to 30.0% of B 2 O 3 component and 10.0 to 60.0% of La 2 O 3 component by mass%, and has an Abbe number of 35 or more (ν d And the content of the Ta 2 O 5 component is less than 15.0%. By reducing the content of Ta 2 O 5 component, the amount of Ta 2 O 5 component requiring melting for expensive and high temperature to reduce the raw material cost and manufacturing cost of the optical glass is reduced. At the same time, by using the B 2 O 3 component and the La 2 O 3 component as a base, the liquidus temperature tends to be low while having an Abbe number (ν d ) of 35 or more. Therefore, an optical glass having high devitrification resistance and an optical element using the same can be obtained at a lower cost while the refractive index (n d ) and Abbe number (ν d ) are within the desired ranges.
以下、本発明の光学ガラスの実施形態について詳細に説明するが、本発明は、以下の実施形態に何ら限定されるものではなく、本発明の目的の範囲内において、適宜変更を加えて実施することができる。なお、説明が重複する箇所については、適宜説明を省略する場合があるが、発明の趣旨を限定するものではない。 Hereinafter, embodiments of the optical glass of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications within the scope of the object of the present invention. be able to. In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited.
［ガラス成分］
本発明の光学ガラスを構成する各成分の組成範囲を以下に述べる。本明細書中で特に断りがない場合、各成分の含有量は、全て酸化物換算組成のガラス全質量に対する質量％で表示されるものとする。ここで、「酸化物換算組成」とは、本発明のガラス構成成分の原料として使用される酸化物、複合塩、金属弗化物等が熔融時に全て分解され酸化物へ変化すると仮定した場合に、当該生成酸化物の総質量を１００質量％として、ガラス中に含有される各成分を表記した組成である。
[Glass component]
The composition range of each component constituting the optical glass of the present invention is described below. Unless otherwise specified in the present specification, the contents of the respective components are all expressed in mass% with respect to the total mass of the glass in terms of oxide. Here, the “oxide equivalent composition” means that the oxide, composite salt, metal fluoride, etc. used as a raw material of the glass component of the present invention are all decomposed and changed into an oxide when melted. It is the composition which described each component contained in glass by making the total mass of the said production | generation oxide into 100 mass%.
＜必須成分、任意成分について＞
Ｂ２Ｏ３成分は、ガラス形成酸化物として欠かすことの出来ない必須成分である。
特に、Ｂ２Ｏ３成分を１．０％以上含有することで、ガラスの耐失透性を高められ、且つガラスの分散を小さくできる。従って、Ｂ２Ｏ３成分の含有量は、好ましくは１．０％、より好ましくは５．０％、さらに好ましくは８．５％、さらに好ましくは１０．５％を下限とする。
一方、Ｂ２Ｏ３成分の含有量を３０．０％以下にすることで、より大きな屈折率を得易くでき、化学的耐久性の悪化を抑えられる。従って、Ｂ２Ｏ３成分の含有量は、好ましくは３０．０％、より好ましくは２５．０％、さらに好ましくは２０．０％、さらに好ましくは１８．０％、さらに好ましくは１６．４％を上限とする。
Ｂ２Ｏ３成分は、原料としてＨ３ＢＯ３、Ｎａ２Ｂ４Ｏ７、Ｎａ２Ｂ４Ｏ７・１０Ｈ２Ｏ、ＢＰＯ４等を用いることができる。
<About essential and optional components>
The B 2 O 3 component is an essential component that is indispensable as a glass-forming oxide.
In particular, by containing 1.0% or more of the B 2 O 3 component, the devitrification resistance of the glass can be enhanced and the dispersion of the glass can be reduced. Therefore, the content of the B 2 O 3 component is preferably 1.0%, more preferably 5.0%, further preferably 8.5%, and further preferably 10.5%.
On the other hand, by making the content of the B 2 O 3 component 30.0% or less, a larger refractive index can be easily obtained, and deterioration of chemical durability can be suppressed. Therefore, the content of the B 2 O 3 component is preferably 30.0%, more preferably 25.0%, even more preferably 20.0%, still more preferably 18.0%, still more preferably 16.4%. Is the upper limit.
As the B 2 O 3 component, H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 .10H 2 O, BPO 4 or the like can be used as a raw material.
Ｌａ２Ｏ３成分は、ガラスの屈折率を高め、分散を小さく（アッベ数を大きく）する成分である。特に、Ｌａ２Ｏ３成分を１０．０％以上含有することで、所望の高屈折率を得ることができる。従って、Ｌａ２Ｏ３成分の含有量は、好ましくは１０．０％、より好ましくは２０．０％、さらに好ましくは２５．０％、さらに好ましくは３０．０％、さらに好ましくは３５．０％を下限とする。
一方、Ｌａ２Ｏ３成分の含有量を６０．０％以下にすることで、ガラスの耐失透性を高められる。従って、Ｌａ２Ｏ３成分の含有量は、好ましくは６０．０％、より好ましくは５５．０％、さらに好ましくは５０．０％を上限とする。
Ｌａ２Ｏ３成分は、原料としてＬａ２Ｏ３、Ｌａ（ＮＯ３）３・ＸＨ２Ｏ（Ｘは任意の整数）等を用いることができる。
The La 2 O 3 component is a component that increases the refractive index of the glass and decreases the dispersion (increases the Abbe number). In particular, a desired high refractive index can be obtained by containing 10.0% or more of the La 2 O 3 component. Accordingly, the content of the La 2 O 3 component is preferably 10.0%, more preferably 20.0%, still more preferably 25.0%, still more preferably 30.0%, and even more preferably 35.0%. Is the lower limit.
On the other hand, the devitrification resistance of the glass can be increased by setting the content of the La 2 O 3 component to 60.0% or less. Accordingly, the content of the La 2 O 3 component is preferably 60.0%, more preferably 55.0%, and still more preferably 50.0%.
As the La 2 O 3 component, La 2 O 3 , La (NO 3 ) 3 .XH 2 O (X is an arbitrary integer) or the like can be used as a raw material.
Ｔａ２Ｏ５成分は、０％超含有する場合に、ガラスの屈折率を高め、耐失透性を高め、且つ熔融ガラスの粘性を高められる任意成分である。
一方で、高価なＴａ２Ｏ５成分を１５．０％未満に低減することで、ガラスの材料コストが低減されるため、より安価な光学ガラスを作製できる。また、これにより、原料の熔解温度が低くなり、原料の熔解に要するエネルギーが低減されるため、光学ガラスの製造コストをも低減できる。従って、Ｔａ２Ｏ５成分の含有量は、好ましくは１５．０％未満、より好ましくは１３．０％未満、さらに好ましくは７．０％未満、さらに好ましくは５．０％未満、さらに好ましくは３．０％未満、さらに好ましくは２．０％未満、さらに好ましくは１．０％未満とする。
Ｔａ２Ｏ５成分は、原料としてＴａ２Ｏ５等を用いることができる。
The Ta 2 O 5 component is an optional component that can increase the refractive index of the glass, increase the devitrification resistance, and increase the viscosity of the molten glass when it contains more than 0%.
On the other hand, by reducing the expensive Ta 2 O 5 component to less than 15.0%, the material cost of the glass is reduced, so that a cheaper optical glass can be produced. Moreover, since the melting temperature of a raw material becomes low by this and the energy required for melting of a raw material is reduced, the manufacturing cost of optical glass can also be reduced. Accordingly, the content of the Ta 2 O 5 component is preferably less than 15.0%, more preferably less than 13.0%, even more preferably less than 7.0%, still more preferably less than 5.0%, and still more preferably. It is less than 3.0%, more preferably less than 2.0%, more preferably less than 1.0%.
As the Ta 2 O 5 component, Ta 2 O 5 or the like can be used as a raw material.
本発明の光学ガラスでは、上述のようにＴａ２Ｏ５成分の含有量を１５．０％未満にしながらも、Ｂ２Ｏ３成分を３０．０％以下にすることが好ましい。これにより、屈折率を高める反面で高価なＴａ２Ｏ５成分及びＧｄ２Ｏ３成分が低減される一方で、屈折率を下げるＢ２Ｏ３成分が低減されることで、Ｔａ２Ｏ５成分及びＧｄ２Ｏ３成分の低減による屈折率の低下を抑えられる。そのため、所望の高屈折率を有しながらも、より安価な光学ガラスを得られる。より好ましくは、Ｔａ２Ｏ５成分の含有量を３．０％未満にし、Ｇｄ２Ｏ３成分の含有量を１０．０％未満にし、且つＢ２Ｏ３成分を１６．４％以下にしてもよい。 In the optical glass of the present invention, the content of the Ta 2 O 5 component is preferably less than 15.0% as described above, but the B 2 O 3 component is preferably 30.0% or less. Thereby, while increasing the refractive index, the expensive Ta 2 O 5 component and the Gd 2 O 3 component are reduced, while the B 2 O 3 component that lowers the refractive index is reduced, thereby reducing the Ta 2 O 5 component. and suppressing a decrease in the refractive index due to the reduction of Gd 2 O 3 component. Therefore, a cheaper optical glass can be obtained while having a desired high refractive index. More preferably, the content of the Ta 2 O 5 component is less than 3.0%, the content of the Gd 2 O 3 component is less than 10.0%, and the B 2 O 3 component is 16.4% or less. Also good.
本発明の光学ガラスでは、上述のようにＴａ２Ｏ５成分の含有量を１５．０％未満にしながらも、Ｌａ２Ｏ３成分を１０．０％以上含有することが好ましい。これにより、屈折率を高める反面で高価なＴａ２Ｏ５成分が低減される一方で、屈折率を上げる成分の中でも比較的安価であり、且つ高アッベ数を維持できるＬａ２Ｏ３成分が所定以上含まれる。そのため、高い屈折率及びアッベ数を有しながらも材料コストの抑えられた光学ガラスを得ることができる。より好ましくは、Ｔａ２Ｏ５成分の含有量を５．０％未満にし、且つＬａ２Ｏ３成分を４０．０％以上含有してもよい。 In the optical glass of the present invention, the La 2 O 3 component is preferably contained in an amount of 10.0% or more while the content of the Ta 2 O 5 component is less than 15.0% as described above. As a result, while the refractive index is increased, the expensive Ta 2 O 5 component is reduced. On the other hand, a La 2 O 3 component that is relatively inexpensive among components that increase the refractive index and can maintain a high Abbe number is predetermined. Included. Therefore, it is possible to obtain an optical glass with a low material cost while having a high refractive index and Abbe number. More preferably, the content of the Ta 2 O 5 component may be less than 5.0% and the La 2 O 3 component may be contained at 40.0% or more.
Ｌｉ２Ｏ成分は、０％超含有する場合に、ガラスの熔融性を改善し、且つガラス転移点を低くできる任意成分である。
一方で、Ｌｉ２Ｏ成分の含有量を１０．０％以下にすることで、ガラスの粘性が高められるため、ガラスの脈理を低減できる。また、これによりガラスの屈折率を低下し難くでき、ガラスの化学的耐久性を高めることができ、且つ、耐失透性を高められる。従って、Ｌｉ２Ｏ成分の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とし、さらに好ましくは１．０％未満、さらに好ましくは０．３％未満とする。
Ｌｉ２Ｏ成分は、原料としてＬｉ２ＣＯ３、ＬｉＮＯ３、Ｌｉ２ＣＯ３等を用いることができる。
The Li 2 O component is an optional component that can improve the meltability of the glass and lower the glass transition point when it contains more than 0%.
On the other hand, by the content of Li 2 O component to 10.0% or less, since the viscosity of the glass is increased, thereby reducing the striae of the glass. Moreover, this can make it difficult to lower the refractive index of the glass, increase the chemical durability of the glass, and improve the devitrification resistance. Accordingly, the content of the Li 2 O component is preferably 10.0%, more preferably 5.0%, still more preferably 3.0%, more preferably less than 1.0%, still more preferably 0%. Less than 3%.
As the Li 2 O component, Li 2 CO 3 , LiNO 3 , Li 2 CO 3 or the like can be used as a raw material.
本発明の光学ガラスでは、上述のようにＴａ２Ｏ５成分の含有量を１５．０％未満にしながらも、Ｂ２Ｏ３成分を３０．０％以下に低減し、且つＬｉ２Ｏ成分の含有量を１０．０％以下にすることが好ましい。これにより、屈折率を高める反面で高価なＴａ２Ｏ５成分が低減される一方で、屈折率を下げるＢ２Ｏ３成分やＬｉ２Ｏ成分が低減されることで、Ｔａ２Ｏ５成分の低減による屈折率の低下を抑えられる。そのため、高い屈折率を有しながらも材料コストの抑えられた光学ガラスを得ることができる。より好ましくは、Ｔａ２Ｏ５成分の含有量を５．０％未満にし、Ｂ２Ｏ３成分を１８．０％以下に低減し、且つＬｉ２Ｏ成分の含有量を１．０％未満にしてもよい。 In the optical glass of the present invention, as described above, the content of the Ta 2 O 5 component is less than 15.0%, but the B 2 O 3 component is reduced to 30.0% or less, and the Li 2 O component The content is preferably 10.0% or less. As a result, while the refractive index is increased, the expensive Ta 2 O 5 component is reduced, while the B 2 O 3 component and the Li 2 O component that lower the refractive index are reduced, thereby reducing the Ta 2 O 5 component. A decrease in refractive index due to the reduction can be suppressed. Therefore, an optical glass having a high refractive index and a reduced material cost can be obtained. More preferably, the content of the Ta 2 O 5 component is less than 5.0%, the B 2 O 3 component is reduced to 18.0% or less, and the content of the Li 2 O component is less than 1.0%. May be.
ＺｎＯ成分は、０％超含有する場合に、ガラス転移点を低くでき、且つ化学的耐久性を高められる任意成分である。そのため、ＺｎＯ成分の含有量は、好ましくは０％超、より好ましくは１．０％、さらに好ましくは３．０％を下限としてもよい。
一方で、ＺｎＯ成分の含有量を２５．０％以下にすることで、ガラスの屈折率の低下や、耐失透性の低下を抑えられる。また、これにより熔融ガラスの粘性が高められるため、ガラスへの脈理の発生を低減できる。従って、ＺｎＯ成分の含有量は、好ましくは２５．０％、より好ましくは２２．０％、さらに好ましくは２０．０％を上限とする。
ＺｎＯ成分は、原料としてＺｎＯ、ＺｎＦ２等を用いることができる。
The ZnO component is an optional component that can lower the glass transition point and increase chemical durability when it is contained in excess of 0%. Therefore, the content of the ZnO component is preferably more than 0%, more preferably 1.0%, and even more preferably 3.0%.
On the other hand, by setting the content of the ZnO component to 25.0% or less, a decrease in the refractive index of glass and a decrease in devitrification resistance can be suppressed. Moreover, since the viscosity of molten glass is raised by this, generation | occurrence | production of the striae to glass can be reduced. Therefore, the content of the ZnO component is preferably 25.0%, more preferably 22.0%, and further preferably 20.0%.
As the ZnO component, ZnO, ZnF 2 or the like can be used as a raw material.
本発明の光学ガラスでは、上述のようにＴａ２Ｏ５成分の含有量を１５．０％未満にしながらも、ＺｎＯ成分を２５．０％以下に低減することが好ましい。これにより、熔融ガラスの粘性や耐失透性を上げる反面で高価なＴａ２Ｏ５成分が低減される一方で、熔融ガラスの粘性を下げるＺｎＯ成分が低減される。そのため、脈理が低減されながらも材料コストが抑えられており、なお且つ耐失透性が高い点で、量産性に優れたガラスを作製することができる。より好ましくは、Ｔａ２Ｏ５成分の含有量を５．０％未満にし、ＺｎＯ成分を２５．０％以下にしてもよい。 In the optical glass of the present invention, the ZnO component is preferably reduced to 25.0% or less while the content of the Ta 2 O 5 component is less than 15.0% as described above. Thereby, while increasing the viscosity and devitrification resistance of the molten glass, the expensive Ta 2 O 5 component is reduced, while the ZnO component lowering the viscosity of the molten glass is reduced. Therefore, the material cost can be suppressed while the striae is reduced, and a glass excellent in mass productivity can be manufactured in terms of high devitrification resistance. More preferably, the content of the Ta 2 O 5 component may be less than 5.0% and the ZnO component may be 25.0% or less.
Ｇｄ２Ｏ３成分は、０％超含有する場合に、ガラスの屈折率を高め、且つアッベ数を高められる任意成分である。
一方で、希土類元素の中でも特に高価なＧｄ２Ｏ３成分を４０．０％以下に低減することで、ガラスの材料コストが低減されるため、より安価な光学ガラスを作製できる。また、これによりガラスのアッベ数の必要以上の上昇を抑えられる。従って、Ｇｄ２Ｏ３成分の含有量は、それぞれ好ましくは４０．０％、より好ましくは３０．０％、さらに好ましくは２０．０％、さらに好ましくは１０．０％を上限とする。
Ｇｄ２Ｏ３成分は、原料としてＧｄ２Ｏ３、ＧｄＦ３等を用いることができる。
The Gd 2 O 3 component is an optional component that can increase the refractive index of the glass and increase the Abbe number when it exceeds 0%.
On the other hand, by reducing the particularly expensive Gd 2 O 3 component among rare earth elements to 40.0% or less, the material cost of the glass is reduced, so that a cheaper optical glass can be produced. Moreover, this can suppress the increase of the Abbe number of the glass more than necessary. Accordingly, the upper limit of the content of the Gd 2 O 3 component is preferably 40.0%, more preferably 30.0%, still more preferably 20.0%, and even more preferably 10.0%.
As the Gd 2 O 3 component, Gd 2 O 3 , GdF 3 or the like can be used as a raw material.
Ｙ２Ｏ３成分は、０％超含有する場合に、高屈折率及び高アッベ数を維持しながらも、ガラスの材料コストを抑えられ、且つ比重を低減できる任意成分である。
一方で、Ｙ２Ｏ３成分の含有量を３０．０％以下にすることで、ガラスの屈折率の低下を抑えられ、且つガラスの耐失透性を高められる。従って、Ｙ２Ｏ３成分の含有量は、好ましくは３０．０％、より好ましくは２５．０％、さらに好ましくは２０．０％を上限とする。
Ｙ２Ｏ３成分は、原料としてＹ２Ｏ３、ＹＦ３等を用いることができる。
The Y 2 O 3 component is an optional component that can suppress the material cost of the glass and reduce the specific gravity while maintaining a high refractive index and a high Abbe number when it contains more than 0%.
On the other hand, by setting the content of the Y 2 O 3 component to 30.0% or less, a decrease in the refractive index of the glass can be suppressed and the devitrification resistance of the glass can be enhanced. Therefore, the content of the Y 2 O 3 component is preferably 30.0%, more preferably 25.0%, and still more preferably 20.0%.
As the Y 2 O 3 component, Y 2 O 3 , YF 3 or the like can be used as a raw material.
Ｙｂ２Ｏ３成分は、０％超含有する場合に、ガラスの屈折率を高め、且つ分散を小さくできる任意成分である。
一方で、Ｙｂ２Ｏ３成分の含有量を２０．０％以下にすることで、ガラスの材料コストが低減されるため、より安価な光学ガラスを作製できる。また、これによりガラスの耐失透性を高められる。従って、Ｙｂ２Ｏ３成分の含有量は、好ましくは２０．０％、より好ましくは１０．０％、さらに好ましくは５．０％を上限とする。
Ｙｂ２Ｏ３成分は、原料としてＹｂ２Ｏ３等を用いることができる。
The Yb 2 O 3 component is an optional component that can increase the refractive index of the glass and reduce the dispersion when it exceeds 0%.
On the other hand, since the material cost of glass is reduced by making the content of the Yb 2 O 3 component 20.0% or less, a cheaper optical glass can be produced. This also increases the devitrification resistance of the glass. Therefore, the content of the Yb 2 O 3 component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
As the Yb 2 O 3 component, Yb 2 O 3 or the like can be used as a raw material.
Ｌｎ２Ｏ３成分（式中、ＬｎはＬａ、Ｇｄ、Ｙ、Ｙｂからなる群より選択される１種以上）の含有量の和（質量和）は、３５．０％以上７５．０％以下が好ましい。
特に、この和を３５．０％以上にすることで、ガラスの分散を小さくできる。従って、Ｌｎ２Ｏ３成分の質量和は、好ましくは３５．０％、より好ましくは４０．０％、さらに好ましくは４５．０％、さらに好ましくは４８．０％を下限とする。
一方で、この和を７５．０％以下にすることで、ガラスの液相温度が低くなるため、耐失透性を高められる。従って、Ｌｎ２Ｏ３成分の質量和は、好ましくは７５．０％、より好ましくは６５．０％、さらに好ましくは６０．０％を上限とする。
Sum (mass sum) of contents of Ln 2 O 3 components (wherein Ln is one or more selected from the group consisting of La, Gd, Y, Yb) is 35.0% or more and 75.0% or less Is preferred.
In particular, the dispersion of the glass can be reduced by setting this sum to 35.0% or more. Therefore, the lower limit of the mass sum of the Ln 2 O 3 component is preferably 35.0%, more preferably 40.0%, still more preferably 45.0%, and even more preferably 48.0%.
On the other hand, by setting the sum to 75.0% or less, the liquidus temperature of the glass is lowered, so that the devitrification resistance can be improved. Therefore, the upper limit of the mass sum of the Ln 2 O 3 component is preferably 75.0%, more preferably 65.0%, and still more preferably 60.0%.
本発明の光学ガラスでは、上述のようにＴａ２Ｏ５成分の含有量を１５．０％未満にしながらも、Ｌｎ２Ｏ３成分の含有量の和を３５．０％以上にすることが好ましい。これにより、アッベ数を下げるＴａ２Ｏ５成分が低減される一方で、アッベ数を高めるＬｎ２Ｏ３成分が所定以上含有されることで、所望の高いアッベ数を得易くできる。より好ましくは、Ｔａ２Ｏ５成分の含有量を５．０％未満にし、且つＬｎ２Ｏ３成分の含有量の和を４０．０％以上にしてもよい。 In the optical glass of the present invention, it is preferable that the sum of the contents of the Ln 2 O 3 component is 35.0% or more while the content of the Ta 2 O 5 component is less than 15.0% as described above. . Thereby, while the Ta 2 O 5 component that lowers the Abbe number is reduced, the Ln 2 O 3 component that increases the Abbe number is contained in a predetermined amount or more, so that a desired high Abbe number can be easily obtained. More preferably, the content of the Ta 2 O 5 component may be less than 5.0%, and the sum of the contents of the Ln 2 O 3 component may be 40.0% or more.
本発明の光学ガラスでは、Ｇｄ２Ｏ３成分、Ｙｂ２Ｏ３成分及びＴａ２Ｏ５成分の含有量の和（質量和）は、３０．０％以下が好ましい。これにより、これら高価な成分の含有量が低減されるため、ガラスの材料コストを抑えられる。従って、質量和（Ｇｄ２Ｏ３＋Ｙｂ２Ｏ３＋Ｔａ２Ｏ５）は、好ましくは３０．０％、より好ましくは２０．０％、さらに好ましくは１５．０％、さらに好ましくは１０．０％を上限とする。 In the optical glass of the present invention, the sum (mass sum) of the contents of the Gd 2 O 3 component, the Yb 2 O 3 component, and the Ta 2 O 5 component is preferably 30.0% or less. Thereby, since content of these expensive components is reduced, the material cost of glass can be held down. Accordingly, the mass sum (Gd 2 O 3 + Yb 2 O 3 + Ta 2 O 5 ) is preferably 30.0%, more preferably 20.0%, still more preferably 15.0%, and even more preferably 10.0%. Is the upper limit.
ＴｉＯ２成分は、０％超含有する場合に、ガラスの屈折率を高め、アッベ数を低く調整し、且つ耐失透性を高められる任意成分である。
一方で、ＴｉＯ２の含有量を１５．０％以下にすることで、ガラスの着色を低減して可視光透過率を高め、且つ、アッベ数の必要以上の低下を抑えられる。また、ＴｉＯ２成分の過剰な含有による失透を抑えられる。従って、ＴｉＯ２成分の含有量は、好ましくは１５．０％、より好ましくは１０．０％、さらに好ましくは５．０％、さらに好ましくは３．０％を上限とする。
ＴｉＯ２成分は、原料としてＴｉＯ２等を用いることができる。
The TiO 2 component is an optional component that can increase the refractive index of the glass, adjust the Abbe number to a low level, and increase the resistance to devitrification when it contains more than 0%.
On the other hand, by making the content of TiO 2 15.0% or less, the coloring of the glass is reduced, the visible light transmittance is increased, and the Abbe number is reduced more than necessary. Further, devitrification due to excessive inclusion of the TiO 2 component can be suppressed. Therefore, the upper limit of the content of the TiO 2 component is preferably 15.0%, more preferably 10.0%, still more preferably 5.0%, and still more preferably 3.0%.
As the TiO 2 component, TiO 2 or the like can be used as a raw material.
Ｎｂ２Ｏ５成分は、０％超含有する場合に、ガラスの屈折率を高められ、且つ耐失透性を高められる任意成分である。そのため、Ｎｂ２Ｏ５成分の含有量は、好ましくは０％超、より好ましくは１．０％超、さらに好ましくは１．５％超、さらに好ましくは２．０％超にしてもよい。
一方で、Ｎｂ２Ｏ５成分の含有量を２０．０％以下にすることで、Ｎｂ２Ｏ５成分の過剰な含有によるガラスの耐失透性の低下や、可視光の透過率の低下を抑えることができる。従って、Ｎｂ２Ｏ５成分の含有量は、好ましくは２０．０％、より好ましくは１５．０％、さらに好ましくは１０．０％を上限とする。
Ｎｂ２Ｏ５成分は、原料としてＮｂ２Ｏ５等を用いることができる。
The Nb 2 O 5 component is an optional component that can increase the refractive index of the glass and increase the devitrification resistance when it exceeds 0%. Therefore, the content of the Nb 2 O 5 component is preferably more than 0%, more preferably more than 1.0%, still more preferably more than 1.5%, and even more preferably more than 2.0%.
On the other hand, by reducing the content of the Nb 2 O 5 component to 20.0% or less, it is possible to reduce the devitrification resistance of the glass due to the excessive content of the Nb 2 O 5 component and the transmittance of visible light. Can be suppressed. Therefore, the content of the Nb 2 O 5 component is preferably 20.0%, more preferably 15.0%, and still more preferably 10.0%.
As the Nb 2 O 5 component, Nb 2 O 5 or the like can be used as a raw material.
ＷＯ３成分は、０％超含有する場合に、他の高屈折率成分によるガラスの着色を低減しながら屈折率を高め、且つガラスの耐失透性を高められる任意成分である。また、ＷＯ３成分は、ガラス転移点を低くできる成分でもある。
一方で、ＷＯ３成分の含有量を２０．０％以下にすることで、ＷＯ３成分によるガラスの着色を低減して可視光透過率を高めることができる。従って、ＷＯ３成分の含有量は、好ましくは２０．０％、より好ましくは１５．０％、さらに好ましくは１０．０％、さらに好ましくは７．０％を上限とする。
ＷＯ３成分は、原料としてＷＯ３等を用いることができる。
The WO 3 component is an optional component that can increase the refractive index and increase the devitrification resistance of the glass while reducing the coloring of the glass due to other high refractive index components when it contains more than 0%. Further, WO 3 components, it is also a component can be lowered glass transition temperature.
On the other hand, by making the content of the WO 3 component 20.0% or less, the coloring of the glass by the WO 3 component can be reduced and the visible light transmittance can be increased. Accordingly, the upper limit of the content of the WO 3 component is preferably 20.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 7.0%.
As the WO 3 component, WO 3 or the like can be used as a raw material.
ここで、ＴｉＯ２成分、Ｎｂ２Ｏ５成分及びＷＯ３成分の含有量の和（質量和）は、３０．０％以下が好ましい。これにより、アッベ数の低下が抑えられるため、所望のアッベ数を得易くできる。また、これら成分の過剰な含有による着色を低減でき、耐失透性を高められる。従って、質量和（ＴｉＯ２＋Ｎｂ２Ｏ５＋ＷＯ３）は、好ましくは３０．０％、より好ましくは２５．０％、さらに好ましくは１９．０％、さらに好ましくは１６．０％、さらに好ましくは１４．０％を上限とする。
一方で、この和は、１．０％以上にしてもよい。これにより、ガラスの材料コストを低減するためにＴａ２Ｏ５成分等を低減しても、ガラスの屈折率を高められ、且つ耐失透性を高められる。従って、質量和（ＴｉＯ２＋Ｎｂ２Ｏ５＋ＷＯ３）は、好ましくは１．０％を下限とし、より好ましくは２．０％超、さらに好ましくは４．０％超としてもよい。
Here, the sum (mass sum) of the contents of the TiO 2 component, the Nb 2 O 5 component, and the WO 3 component is preferably 30.0% or less. Thereby, since the fall of Abbe number is suppressed, it can be easy to obtain a desired Abbe number. Further, coloring due to excessive inclusion of these components can be reduced, and devitrification resistance can be enhanced. Accordingly, the mass sum (TiO 2 + Nb 2 O 5 + WO 3 ) is preferably 30.0%, more preferably 25.0%, even more preferably 19.0%, still more preferably 16.0%, and even more preferably. The upper limit is 14.0%.
On the other hand, this sum may be 1.0% or more. Accordingly, even when reducing the Ta 2 O 5 component or the like in order to reduce the material cost of the glass, an elevated refractive index of the glass, and enhance resistance to devitrification. Therefore, the mass sum (TiO 2 + Nb 2 O 5 + WO 3 ) is preferably 1.0% as a lower limit, more preferably more than 2.0%, and even more preferably more than 4.0%.
ＳｉＯ２成分は、０％超含有する場合に、熔融ガラスの粘度を高め、ガラスの着色を低減でき、且つ耐失透性を高められる任意成分である。従って、ＳｉＯ２成分の含有量は、好ましくは０％超、より好ましくは１．０％、さらに好ましくは３．０％、さらに好ましくは５．０％を下限としてもよく、さらに好ましくは６．０％超としてもよい。
一方で、ＳｉＯ２成分の含有量を３０．０％以下にすることで、ガラス転移点の上昇を抑え、且つ屈折率の低下を抑えることができる。従って、ＳｉＯ２成分の含有量は、好ましくは３０．０％、より好ましくは２０．０％、さらに好ましくは１５．０％、さらに好ましくは１０．０％を上限とする。
ＳｉＯ２成分は、原料としてＳｉＯ２、Ｋ２ＳｉＦ６、Ｎａ２ＳｉＦ６等を用いることができる。
The SiO 2 component is an optional component that, when contained over 0%, can increase the viscosity of the molten glass, reduce the coloration of the glass, and increase the devitrification resistance. Therefore, the content of the SiO 2 component is preferably more than 0%, more preferably 1.0%, even more preferably 3.0%, still more preferably 5.0%, and even more preferably 6.%. It may be more than 0%.
On the other hand, when the content of the SiO 2 component is 30.0% or less, an increase in the glass transition point can be suppressed and a decrease in the refractive index can be suppressed. Therefore, the content of the SiO 2 component is preferably 30.0%, more preferably 20.0%, further preferably 15.0%, and further preferably 10.0%.
As the SiO 2 component, SiO 2 , K 2 SiF 6 , Na 2 SiF 6 or the like can be used as a raw material.
ここで、Ｂ２Ｏ３成分及びＳｉＯ２成分の含有量の和（質量和）は、１．０％以上３０．０％以下が好ましい。
特に、この和を１．０％以上にすることで、Ｂ２Ｏ３成分やＳｉＯ２成分の欠乏による耐失透性の低下を抑えられる。従って、質量和（Ｂ２Ｏ３＋ＳｉＯ２）は、好ましくは１．０％、より好ましくは５．０％、さらに好ましくは１０．０％、さらに好ましくは１５．０％、さらに好ましくは１８．０％を下限とする。
一方で、この和を３０．０％以下にすることで、これらの成分の過剰な含有による屈折率の低下が抑えられるので、所望の高屈折率を得易くできる。従って、質量和（Ｂ２Ｏ３＋ＳｉＯ２）は、好ましくは３０．０％、より好ましくは２７．０％、さらに好ましくは２４．０％を上限とする。
Here, the sum (mass sum) of the contents of the B 2 O 3 component and the SiO 2 component is preferably 1.0% or more and 30.0% or less.
In particular, by making this sum 1.0% or more, it is possible to suppress a decrease in devitrification resistance due to the lack of the B 2 O 3 component or the SiO 2 component. Accordingly, the mass sum (B 2 O 3 + SiO 2 ) is preferably 1.0%, more preferably 5.0%, still more preferably 10.0%, still more preferably 15.0%, and even more preferably 18. 0% is the lower limit.
On the other hand, by making this sum 30.0% or less, a decrease in the refractive index due to excessive inclusion of these components can be suppressed, so that a desired high refractive index can be easily obtained. Accordingly, the upper limit of the mass sum (B 2 O 3 + SiO 2 ) is preferably 30.0%, more preferably 27.0%, and still more preferably 24.0%.
Ｎａ２Ｏ成分、Ｋ２Ｏ成分及びＣｓ２Ｏ成分は、０％超含有する場合に、ガラスの熔融性を改善し、ガラスの耐失透性を高め、且つガラス転移点を低くできる任意成分である。ここで、Ｎａ２Ｏ成分、Ｋ２Ｏ成分及びＣｓ２Ｏ成分の各々の含有量を１０．０％以下にすることで、ガラスの屈折率を低下し難くし、且つ、耐失透性を高められる。従って、Ｎａ２Ｏ成分、Ｋ２Ｏ成分及びＣｓ２Ｏ成分の各々の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とする。
Ｎａ２Ｏ成分、Ｋ２Ｏ成分及びＣｓ２Ｏ成分は、原料としてＮａＮＯ３、ＮａＦ、Ｎａ２ＳｉＦ６、Ｋ２ＣＯ３、ＫＮＯ３、ＫＦ、ＫＨＦ２、Ｋ２ＳｉＦ６、Ｃｓ２ＣＯ３、ＣｓＮＯ３等を用いることができる。
Na 2 O component, K 2 O component, and Cs 2 O component are optional components that can improve the meltability of glass, increase the devitrification resistance of glass, and lower the glass transition point when contained in excess of 0%. It is. Here, by making each content of the Na 2 O component, the K 2 O component and the Cs 2 O component 10.0% or less, it is difficult to lower the refractive index of the glass, and the devitrification resistance is improved. Enhanced. Therefore, the content of each of the Na 2 O component, the K 2 O component, and the Cs 2 O component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
Na 2 O component, K 2 O component and Cs 2 O component, NaNO 3 as a raw material, NaF, Na 2 SiF 6, K 2 CO 3, KNO 3, KF, KHF 2, K 2 SiF 6, Cs 2 CO 3 , CsNO 3 or the like can be used.
Ｒｎ２Ｏ成分（式中、ＲｎはＬｉ、Ｎａ、Ｋ、Ｃｓからなる群より選択される１種以上）の合計量は、１５．０％以下が好ましい。これにより、ガラスの屈折率の低下を抑え、且つ耐失透性を高められる。従って、Ｒｎ２Ｏ成分の質量和は、好ましくは１５．０％、より好ましくは１０．０％、さらに好ましくは５．０％を上限とする。 The total amount of Rn 2 O components (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is preferably 15.0% or less. Thereby, the fall of the refractive index of glass can be suppressed and devitrification resistance can be improved. Therefore, the upper limit of the mass sum of the Rn 2 O component is preferably 15.0%, more preferably 10.0%, and still more preferably 5.0%.
ＭｇＯ成分、ＣａＯ成分、ＳｒＯ成分及びＢａＯ成分は、０％超含有する場合に、ガラス原料の熔融性やガラスの耐失透性を高められる任意成分である。
一方で、ＭｇＯ成分、ＣａＯ成分及びＳｒＯ成分の各々の含有量を１０．０％以下にすること、及び／又は、ＢａＯ成分の含有量を２５．０％以下にすることで、これらの成分の過剰な含有による、屈折率の低下や耐失透性の低下を抑えられる。従って、ＭｇＯ成分、ＣａＯ成分及びＳｒＯ成分の各々の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とする。また、ＢａＯ成分の含有量は、好ましくは２５．０％、より好ましくは１５．０％、さらに好ましくは１０．０％、さらに好ましくは８．０％を上限とする。
ＭｇＯ成分、ＣａＯ成分、ＳｒＯ成分及びＢａＯ成分は、原料としてＭｇＣＯ３、ＭｇＦ２、ＣａＣＯ３、ＣａＦ２、Ｓｒ（ＮＯ３）２、ＳｒＦ２、ＢａＣＯ３、Ｂａ（ＮＯ３）２、ＢａＦ２等を用いることができる。
The MgO component, CaO component, SrO component, and BaO component are optional components that can enhance the meltability of the glass raw material and the devitrification resistance of the glass when the content exceeds 0%.
On the other hand, the content of each of the MgO component, the CaO component and the SrO component is set to 10.0% or less, and / or the content of the BaO component is set to 25.0% or less. Reduction of refractive index and devitrification resistance due to excessive inclusion can be suppressed. Therefore, the content of each of the MgO component, CaO component and SrO component is preferably 10.0%, more preferably 5.0%, and even more preferably 3.0%. Further, the content of the BaO component is preferably 25.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 8.0%.
MgO component, CaO component, SrO component and BaO component are MgCO 3 , MgF 2 , CaCO 3 , CaF 2 , Sr (NO 3 ) 2 , SrF 2 , BaCO 3 , Ba (NO 3 ) 2 , BaF 2 and the like as raw materials. Can be used.
ＲＯ成分（式中、ＲはＭｇ、Ｃａ、Ｓｒ、Ｂａからなる群より選択される１種以上）の含有量の合計（質量和）は、２５．０％以下が好ましい。これにより、ＲＯ成分の過剰な含有による、ガラスの屈折率の低下や耐失透性の低下を抑えられる。従って、ＲＯ成分の質量和は、好ましくは２５．０％、より好ましくは１５．０％、さらに好ましくは１０．０％、さらに好ましくは５．０％を上限とする。 The total content (mass sum) of RO components (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, and Ba) is preferably 25.0% or less. Thereby, the fall of the refractive index of glass and the fall of devitrification resistance by containing excessive RO component can be suppressed. Accordingly, the upper limit of the mass sum of the RO component is preferably 25.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 5.0%.
Ｐ２Ｏ５成分は、０％超含有する場合に、ガラスの耐失透性を高められる任意成分である。特に、Ｐ２Ｏ５成分の含有量を１０．０％以下にすることで、ガラスの化学的耐久性、特に耐水性の低下を抑えられる。従って、Ｐ２Ｏ５成分の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とする。
Ｐ２Ｏ５成分は、原料としてＡｌ（ＰＯ３）３、Ｃａ（ＰＯ３）２、Ｂａ（ＰＯ３）２、ＢＰＯ４、Ｈ３ＰＯ４等を用いることができる。
P 2 O 5 component, when ultra containing 0%, which is an optional component that enhances devitrification resistance of the glass. In particular, by making the content of the P 2 O 5 component 10.0% or less, it is possible to suppress a decrease in chemical durability, particularly water resistance, of the glass. Therefore, the content of the P 2 O 5 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the P 2 O 5 component, Al (PO 3 ) 3 , Ca (PO 3 ) 2 , Ba (PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like can be used as a raw material.
ＧｅＯ２成分は、０％超含有する場合に、ガラスの屈折率を高め、且つ耐失透性を向上できる任意成分である。しかしながら、ＧｅＯ２は原料価格が高いため、その量が多いと材料コストが高くなることで、Ｔａ２Ｏ５成分等を低減することによるコスト低減の効果が減殺される。従って、ＧｅＯ２成分の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは１．０％を上限とし、最も好ましくは含有しない。
ＧｅＯ２成分は、原料としてＧｅＯ２等を用いることができる。
The GeO 2 component is an optional component that can increase the refractive index of the glass and improve the devitrification resistance when it contains more than 0%. However, since the raw material price of GeO 2 is high, the material cost increases when the amount of GeO 2 is large, thereby reducing the cost reduction effect by reducing the Ta 2 O 5 component and the like. Accordingly, the content of the GeO 2 component is preferably 10.0%, more preferably 5.0%, still more preferably 1.0%, and most preferably not contained.
As the GeO 2 component, GeO 2 or the like can be used as a raw material.
ＺｒＯ２成分は、０％超含有する場合に、ガラスの高屈折率化及び低分散化に寄与でき、且つガラスの耐失透性を高められる。そのため、ＺｒＯ２成分の含有量は、好ましくは０％超、より好ましくは１．０％、さらに好ましくは３．０％を下限としてもよい。
一方で、ＺｒＯ２成分を１５．０％以下にすることで、ＺｒＯ２成分の過剰な含有によるガラスの耐失透性の低下を抑えられる。従って、ＺｒＯ２成分の含有量は、好ましくは１５．０％、より好ましくは１０．０％、さらに好ましくは８．０％を上限とする。
ＺｒＯ２成分は、原料としてＺｒＯ２、ＺｒＦ４等を用いることができる。
When the ZrO 2 component is contained in an amount of more than 0%, it can contribute to a higher refractive index and a lower dispersion of the glass, and the devitrification resistance of the glass can be improved. Therefore, the content of the ZrO 2 component is preferably more than 0%, more preferably 1.0%, and even more preferably 3.0%.
On the other hand, by making the ZrO 2 component 15.0% or less, it is possible to suppress a decrease in the devitrification resistance of the glass due to the excessive inclusion of the ZrO 2 component. Therefore, the upper limit of the content of the ZrO 2 component is preferably 15.0%, more preferably 10.0%, and still more preferably 8.0%.
As the ZrO 2 component, ZrO 2 , ZrF 4 or the like can be used as a raw material.
Ａｌ２Ｏ３成分及びＧａ２Ｏ３成分は、０％超含有する場合に、ガラスの化学的耐久性を高め、且つガラスの耐失透性を高められる任意成分である。
一方で、Ａｌ２Ｏ３成分及びＧａ２Ｏ３成分の各々の含有量を１０．０％以下にすることで、これらの過剰な含有によるガラスの耐失透性の低下を抑えられる。従って、Ａｌ２Ｏ３成分及びＧａ２Ｏ３成分の各々の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とする。
Ａｌ２Ｏ３成分及びＧａ２Ｏ３成分は、原料としてＡｌ２Ｏ３、Ａｌ（ＯＨ）３、ＡｌＦ３、Ｇａ２Ｏ３、Ｇａ（ＯＨ）３等を用いることができる。
The Al 2 O 3 component and the Ga 2 O 3 component are optional components that can increase the chemical durability of the glass and increase the devitrification resistance of the glass when contained in excess of 0%.
On the other hand, by making each content of the Al 2 O 3 component and the Ga 2 O 3 component 10.0% or less, a decrease in the devitrification resistance of the glass due to the excessive content thereof can be suppressed. Therefore, the content of each of the Al 2 O 3 component and the Ga 2 O 3 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
For the Al 2 O 3 component and the Ga 2 O 3 component, Al 2 O 3 , Al (OH) 3 , AlF 3 , Ga 2 O 3 , Ga (OH) 3 or the like can be used as a raw material.
Ｂｉ２Ｏ３成分は、０％超含有する場合に、屈折率を高め、且つガラス転移点を下げられる任意成分である。
一方で、Ｂｉ２Ｏ３成分の含有量を１０．０％以下にすることで、ガラスの耐失透性を高められ、且つ、ガラスの着色を低減して可視光透過率を高められる。従って、Ｂｉ２Ｏ３成分の含有量は、好ましくは１０．０％、より好ましくは５．０％、さらに好ましくは３．０％を上限とする。
Ｂｉ２Ｏ３成分は、原料としてＢｉ２Ｏ３等を用いることができる。
A Bi 2 O 3 component is an optional component that can increase the refractive index and lower the glass transition point when it exceeds 0%.
On the other hand, by setting the content of the Bi 2 O 3 component to 10.0% or less, the devitrification resistance of the glass can be increased, and the coloring of the glass can be reduced to increase the visible light transmittance. Therefore, the content of the Bi 2 O 3 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the Bi 2 O 3 component, Bi 2 O 3 or the like can be used as a raw material.
ＴｅＯ２成分は、０％超含有する場合に、屈折率を高め、且つガラス転移点を下げられる任意成分である。
しかしながら、ＴｅＯ２は白金製の坩堝や、溶融ガラスと接する部分が白金で形成されている溶融槽でガラス原料を熔融する際、白金と合金化しうる問題がある。従って、ＴｅＯ２成分の含有量は、好ましくは２０．０％、より好ましくは１０．０％、さらに好ましくは５．０％を上限とし、さらに好ましくは含有しない。
ＴｅＯ２成分は、原料としてＴｅＯ２等を用いることができる。
The TeO 2 component is an optional component that can increase the refractive index and lower the glass transition point when it is contained in excess of 0%.
However, TeO 2 has a problem that it can be alloyed with platinum when a glass raw material is melted in a crucible made of platinum or a melting tank in which a portion in contact with molten glass is formed of platinum. Accordingly, the content of the TeO 2 component is preferably 20.0%, more preferably 10.0%, still more preferably 5.0%, and even more preferably not contained.
TeO 2 component can use TeO 2 or the like as a raw material.
ＳｎＯ２成分は、０％超含有する場合に、熔融ガラスの酸化を低減して清澄し、且つガラスの可視光透過率を高められる任意成分である。
一方で、ＳｎＯ２成分の含有量を１．０％以下にすることで、熔融ガラスの還元によるガラスの着色や、ガラスの失透を低減できる。また、ＳｎＯ２成分と熔解設備（特にＰｔ等の貴金属）の合金化が低減されるため、熔解設備の長寿命化を図れる。従って、ＳｎＯ２成分の含有量は、好ましくは１．０％、より好ましくは０．７％、さらに好ましくは０．５％を上限とする。
ＳｎＯ２成分は、原料としてＳｎＯ、ＳｎＯ２、ＳｎＦ２、ＳｎＦ４等を用いることができる。
When the SnO 2 component is contained in an amount of more than 0%, the SnO 2 component is an optional component that can be refined by reducing the oxidation of the molten glass and can increase the visible light transmittance of the glass.
On the other hand, by setting the content of the SnO 2 component to 1.0% or less, it is possible to reduce the coloring of the glass due to the reduction of the molten glass and the devitrification of the glass. Further, since the alloying of the SnO 2 component and the melting equipment (especially a noble metal such as Pt) is reduced, the life of the melting equipment can be extended. Therefore, the content of the SnO 2 component is preferably 1.0%, more preferably 0.7%, and still more preferably 0.5%.
For the SnO 2 component, SnO, SnO 2 , SnF 2 , SnF 4 or the like can be used as a raw material.
Ｓｂ２Ｏ３成分は、０％超含有する場合に、熔融ガラスを脱泡できる任意成分である。
一方で、Ｓｂ２Ｏ３量が多すぎると、可視光領域の短波長領域における透過率が悪くなる。従って、Ｓｂ２Ｏ３成分の含有量は、好ましくは１．０％、より好ましくは０．７％、さらに好ましくは０．５％を上限とする。
Ｓｂ２Ｏ３成分は、原料としてＳｂ２Ｏ３、Ｓｂ２Ｏ５、Ｎａ２Ｈ２Ｓｂ２Ｏ７・５Ｈ２Ｏ等を用いることができる。
The Sb 2 O 3 component is an optional component that can degas the molten glass when it contains more than 0%.
On the other hand, when the amount of Sb 2 O 3 is too large, the transmittance in the short wavelength region of the visible light region is deteriorated. Therefore, the content of the Sb 2 O 3 component is preferably 1.0%, more preferably 0.7%, and still more preferably 0.5%.
As the Sb 2 O 3 component, Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 .5H 2 O, or the like can be used as a raw material.
なお、ガラスを清澄し脱泡する成分は、上記のＳｂ２Ｏ３成分に限定されるものではなく、ガラス製造の分野における公知の清澄剤、脱泡剤或いはそれらの組み合わせを用いることができる。 Incidentally, components defoamed fining glass is not limited to the above Sb 2 O 3 component, a known refining agents in the field of glass production, it is possible to use a defoamer or a combination thereof.
＜含有すべきでない成分について＞
次に、本発明の光学ガラスに含有すべきでない成分、及び含有することが好ましくない成分について説明する。
<About ingredients that should not be included>
Next, components that should not be contained in the optical glass of the present invention and components that are not preferably contained will be described.
他の成分を本願発明のガラスの特性を損なわない範囲で必要に応じ、添加することができる。ただし、Ｔｉ、Ｚｒ、Ｎｂ、Ｗ、Ｌａ、Ｇｄ、Ｙ、Ｙｂ、Ｌｕを除く、Ｖ、Ｃｒ、Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ、Ａｇ及びＭｏ等の各遷移金属成分は、それぞれを単独又は複合して少量含有した場合でもガラスが着色し、可視域の特定の波長に吸収を生じる性質があるため、特に可視領域の波長を使用する光学ガラスにおいては、実質的に含まないことが好ましい。 Other components can be added as necessary within the range not impairing the properties of the glass of the present invention. However, each transition metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, excluding Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, is independent of each other. Or, even when it is contained in a small amount in combination, the glass is colored and has the property of causing absorption at a specific wavelength in the visible range. .
また、ＰｂＯ等の鉛化合物及びＡｓ２Ｏ３等の砒素化合物は、環境負荷が高い成分であるため、実質的に含有しないこと、すなわち、不可避な混入を除いて一切含有しないことが望ましい。 Moreover, since lead compounds such as PbO and arsenic compounds such as As 2 O 3 are components with high environmental loads, it is desirable that they are not substantially contained, that is, not contained at all except for inevitable mixing.
さらに、Ｔｈ、Ｃｄ、Ｔｌ、Ｏｓ、Ｂｅ、及びＳｅの各成分は、近年有害な化学物資として使用を控える傾向にあり、ガラスの製造工程のみならず、加工工程、及び製品化後の処分に至るまで環境対策上の措置が必要とされる。従って、環境上の影響を重視する場合には、これらを実質的に含有しないことが好ましい。 Furthermore, each component of Th, Cd, Tl, Os, Be, and Se has tended to be refrained from being used as a harmful chemical material in recent years, and not only in the glass manufacturing process, but also in the processing process and disposal after commercialization. Until then, environmental measures are required. Therefore, when importance is placed on the environmental impact, it is preferable that these are not substantially contained.
本発明のガラス組成物は、その組成が酸化物換算組成のガラス全質量に対する質量％で表されているため直接的にモル％の記載に表せるものではないが、本発明において要求される諸特性を満たすガラス組成物中に存在する各成分のモル％表示による組成は、酸化物換算組成で概ね以下の値をとる。
Ｂ２Ｏ３成分 ２．０〜５５．０モル％、及び
Ｌａ２Ｏ３成分 ５．０〜３０．０モル％、
並びに
Ｌｉ２Ｏ成分 ０〜３０．０モル％、
ＺｎＯ成分 ０〜６０．０モル％、
Ｇｄ２Ｏ３成分 ０〜２０．０モル％、
Ｙ２Ｏ３成分 ０〜２０．０モル％、
Ｙｂ２Ｏ３成分 ０〜１０．０モル％、
ＴｉＯ２成分 ０〜３０．０モル％、
Ｎｂ２Ｏ５成分 ０〜１５．０モル％、
ＷＯ３成分 ０〜１５．０モル％、
Ｔａ２Ｏ５成分 ０〜５．０モル％、
ＳｉＯ２成分 ０〜６０．０モル％、
Ｎａ２Ｏ成分 ０〜２５．０モル％、
Ｋ２Ｏ成分 ０〜２０．０モル％、
Ｃｓ２Ｏ成分 ０〜１０．０モル％、
ＭｇＯ成分 ０〜２５．０モル％、
ＣａＯ成分 ０〜２０．０モル％、
ＳｒＯ成分 ０〜１５．０モル％、
ＢａＯ成分 ０〜３５．０モル％、
Ｐ２Ｏ５成分 ０〜１５．０モル％、
ＧｅＯ２成分 ０〜１０．０モル％、
ＺｒＯ２成分 ０〜２０．０モル％、
Ａｌ２Ｏ３成分 ０〜２０．０モル％、
Ｇａ２Ｏ３成分 ０〜５．０モル％、
Ｂｉ２Ｏ３成分 ０〜５．０モル％、
ＴｅＯ２成分 ０〜２０．０モル％、
ＳｎＯ２成分 ０〜０．３モル％、又は
Ｓｂ２Ｏ３成分 ０〜０．５モル％
The glass composition of the present invention cannot be expressed directly in the description of mol% because the composition is expressed by mass% with respect to the total mass of the glass of oxide conversion composition, but various properties required in the present invention. The composition expressed by mol% of each component present in the glass composition satisfying the above conditions generally takes the following values in terms of oxide conversion.
B 2 O 3 component from 2.0 to 55.0 mol%, and La 2 O 3 component from 5.0 to 30.0 mol%,
Li 2 O component 0 to 30.0 mol%,
ZnO component 0-60.0 mol%,
Gd 2 O 3 component 0 to 20.0 mol%,
Y 2 O 3 component 0 to 20.0 mol%,
Yb 2 O 3 component 0 to 10.0 mol%,
TiO 2 component 0 to 30.0 mol%,
Nb 2 O 5 component 0 to 15.0 mol%,
WO 3 components 0 to 15.0 mol%,
Ta 2 O 5 component 0-5.0 mol%,
SiO 2 component 0 to 60.0 mol%,
Na 2 O component from 0 to 25.0 mol%,
K 2 O component 0 to 20.0 mol%,
Cs 2 O component 0 to 10.0 mol%,
MgO component 0 to 25.0 mol%,
CaO component 0 to 20.0 mol%,
SrO component 0 to 15.0 mol%,
BaO component 0 to 35.0 mol%,
P 2 O 5 component from 0 to 15.0 mol%,
GeO 2 component 0 to 10.0 mol%,
ZrO 2 component 0 to 20.0 mol%,
Al 2 O 3 component 0 to 20.0 mol%,
Ga 2 O 3 component 0-5.0 mol%,
Bi 2 O 3 component 0-5.0 mol%,
TeO 2 component 0-20.0 mol%,
SnO 2 component 0 to 0.3 mol%, or Sb 2 O 3 component 0 to 0.5 mol%
［製造方法］
本発明の光学ガラスは、例えば以下のように作製される。すなわち、上記原料を各成分が所定の含有量の範囲内になるように均一に混合し、作製した混合物を白金坩堝に投入し、ガラス組成の熔融難易度に応じて電気炉で１１００〜１５００℃の温度範囲で２〜５時間熔融し、攪拌均質化した後、適当な温度に下げてから金型に鋳込み、徐冷することにより作製される。
[Production method]
The optical glass of the present invention is produced, for example, as follows. That is, the above 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 1100-1500 ° C. in an electric furnace depending on the difficulty of melting the glass composition. It is produced by melting in the temperature range of 2 to 5 hours, stirring and homogenizing, lowering to an appropriate temperature, casting into a mold, and slow cooling.
［物性］
本発明の光学ガラスは、高屈折率及び高アッベ数（低分散）を有することが好ましい。特に、本発明の光学ガラスの屈折率（ｎｄ）は、好ましくは１．７５、より好ましくは１．８０、さらに好ましくは１．８３を下限とする。この屈折率の上限は、好ましくは２．２０、より好ましくは２．１５、さらに好ましくは２．１０であってもよい。また、本発明の光学ガラスのアッベ数（νｄ）は、好ましくは３５、より好ましくは３７、さらに好ましくは３９を下限とし、好ましくは５０、より好ましくは４７、さらに好ましくは４５を上限とする。
このような高屈折率を有することで、光学素子の薄型化を図っても大きな光の屈折量を得ることができる。また、このような低分散を有することで、単レンズであっても光の波長による焦点のずれ（色収差）が小さくなる。加えて、このような低分散を有することで、例えば高分散（低いアッベ数）を有する光学素子と組み合わせた場合に、高い結像特性等を図ることができる。
従って、本発明の光学ガラスは、光学設計上有用であり、特に高い結像特性等を図りながらも、光学系の小型化を図ることができ、光学設計の自由度を広げることができる。
[Physical properties]
The optical glass of the present invention preferably has a high refractive index and a high Abbe number (low dispersion). In particular, the refractive index (n d ) of the optical glass of the present invention is preferably 1.75, more preferably 1.80, and still more preferably 1.83. The upper limit of this refractive index is preferably 2.20, more preferably 2.15, and even more preferably 2.10. Further, the Abbe number (ν d ) of the optical glass of the present invention is preferably 35, more preferably 37, still more preferably 39, and a lower limit, preferably 50, more preferably 47, and still more preferably 45. .
By having such a high refractive index, a large amount of light can be obtained even if the optical element is thinned. In addition, by having such low dispersion, even with a single lens, focus shift (chromatic aberration) due to the wavelength of light is reduced. In addition, by having such low dispersion, for example, when combined with an optical element having high dispersion (low Abbe number), high imaging characteristics and the like can be achieved.
Therefore, the optical glass of the present invention is useful in optical design, and the optical system can be miniaturized and the degree of freedom in optical design can be expanded while achieving particularly high imaging characteristics.
本発明の光学ガラスは、耐失透性が高いこと、より具体的には、低い液相温度を有することが好ましい。すなわち、本発明の光学ガラスの液相温度は、好ましくは１３００℃、より好ましくは１２９０℃、さらに好ましくは１２８０℃を上限とする。これにより、より低い温度で熔融ガラスを流出しても、作製されたガラスの結晶化が低減されるため、特に熔融状態からガラスを形成したときの失透を低減でき、ガラスを用いた光学素子の光学特性への影響を低減できる。また、ガラスの熔解温度を低くしてもガラスを成形できるため、ガラスの成形時に消費するエネルギーを抑えることで、ガラスの製造コストを低減できる。一方、本発明の光学ガラスの液相温度の下限は特に限定しないが、本発明によって得られるガラスの液相温度は、好ましくは５００℃、より好ましくは６００℃、さらに好ましくは７００℃を下限としてもよい。なお、本明細書中における「液相温度」は、５０ｍｌの容量の白金製坩堝に３０ｃｃのカレット状のガラス試料を白金坩堝に入れて１３５０℃で完全に熔融状態にし、所定の温度まで降温して１２時間保持し、炉外に取り出して冷却した後直ちにガラス表面及びガラス中の結晶の有無を観察し、結晶が認められない一番低い温度を表す。ここで降温する際の所定の温度は、１３００℃までの１０℃刻みの温度である。 The optical glass of the present invention preferably has high devitrification resistance, more specifically, a low liquidus temperature. That is, the upper limit of the liquidus temperature of the optical glass of the present invention is preferably 1300 ° C, more preferably 1290 ° C, and still more preferably 1280 ° C. As a result, even if the molten glass flows out at a lower temperature, crystallization of the produced glass is reduced, and thus devitrification when the glass is formed from a molten state can be reduced, and an optical element using glass The influence on the optical characteristics can be reduced. Moreover, since glass can be shape | molded even if the melting temperature of glass is lowered | hung, the manufacturing cost of glass can be reduced by suppressing the energy consumed at the time of shaping | molding glass. On the other hand, the lower limit of the liquidus temperature of the optical glass of the present invention is not particularly limited, but the liquidus temperature of the glass obtained by the present invention is preferably 500 ° C, more preferably 600 ° C, and even more preferably 700 ° C. Also good. In this specification, “liquid phase temperature” refers to a 30 ml cullet-shaped glass sample placed in a platinum crucible in a 50 ml capacity platinum crucible, completely melted at 1350 ° C., and cooled to a predetermined temperature. The glass surface and the presence or absence of crystals in the glass are observed immediately after taking out of the furnace and cooling, and indicates the lowest temperature at which no crystals are observed. The predetermined temperature when the temperature is lowered is a temperature in increments of 10 ° C. up to 1300 ° C.
本発明の光学ガラスは、可視光透過率、特に可視光のうち短波長側の光の透過率が高く、それにより着色が少ないことが好ましい。
特に、本発明の光学ガラスは、ガラスの透過率で表すと、厚み１０ｍｍのサンプルで分光透過率７０％を示す波長（λ７０）は、好ましくは５００ｎｍ、より好ましくは４５０ｎｍ、さらに好ましくは４００ｎｍを上限とする。
また、本発明の光学ガラスにおける、厚み１０ｍｍのサンプルで分光透過率５％を示す最も短い波長（λ５）は、好ましくは４００ｎｍ、より好ましくは３８０ｎｍ、さらに好ましくは３６０ｎｍを上限とする。
これらにより、ガラスの吸収端が紫外領域の近傍になり、可視光に対するガラスの透明性が高められるため、この光学ガラスを、レンズ等の光を透過させる光学素子に好ましく用いることができる。
It is preferable that the optical glass of the present invention has high visible light transmittance, in particular, high transmittance of light on the short wavelength side of visible light, and thereby less coloring.
In particular, when the optical glass of the present invention is expressed by the transmittance of the glass, the wavelength (λ 70 ) showing a spectral transmittance of 70% in a sample having a thickness of 10 mm is preferably 500 nm, more preferably 450 nm, and still more preferably 400 nm. The upper limit.
In the optical glass of the present invention, the shortest wavelength (λ 5 ) having a spectral transmittance of 5% in a sample having a thickness of 10 mm is preferably 400 nm, more preferably 380 nm, and still more preferably 360 nm.
As a result, the absorption edge of the glass is in the vicinity of the ultraviolet region, and the transparency of the glass with respect to visible light is enhanced. Therefore, this optical glass can be preferably used for an optical element that transmits light such as a lens.
本発明の光学ガラスは、低い部分分散比（θｇ，Ｆ）を有することが好ましい。より具体的には、本発明の光学ガラスの部分分散比（θｇ，Ｆ）は、アッベ数（νｄ）との間で、（−２．５０×１０−３×νｄ＋０．６５７１）≦（θｇ，Ｆ）≦（−２．５０×１０−３×νｄ＋０．６９７１）の関係を満たすことが好ましい。これにより、部分分散比（θｇ，Ｆ）の小さい光学ガラスが得られるため、光学ガラスを光学素子の色収差の低減等に役立てられる。
従って、本発明の光学ガラスの部分分散比（θｇ，Ｆ）は、好ましくは（−２．５０×１０−３×νｄ＋０．６５７１）、より好ましくは（−２．５０×１０−３×νｄ＋０．６５９１）、さらに好ましくは（−２．５０×１０−３×νｄ＋０．６６１１）を下限とする。
一方で、本発明の光学ガラスの部分分散比（θｇ，Ｆ）は、好ましくは（−２．５０×１０−３×νｄ＋０．６９７１）、より好ましくは（−２．５０×１０−３×νｄ＋０．６９２１）、さらに好ましくは（−２．５０×１０−３×νｄ＋０．６８７１）を上限とする。
The optical glass of the present invention preferably has a low partial dispersion ratio (θg, F). More specifically, the partial dispersion ratio (θg, F) of the optical glass of the present invention is (−2.50 × 10 −3 × ν d +0.6571) ≦ with respect to the Abbe number (ν d ) ≦ It is preferable to satisfy the relationship (θg, F) ≦ (−2.50 × 10 −3 × ν d +0.6971). Thereby, since an optical glass having a small partial dispersion ratio (θg, F) is obtained, the optical glass is useful for reducing chromatic aberration of an optical element.
Therefore, the partial dispersion ratio (θg, F) of the optical glass of the present invention is preferably (−2.50 × 10 −3 × ν d +0.6571), more preferably (−2.50 × 10 −3 ×). (ν d +0.6591), more preferably (−2.50 × 10 −3 × ν d +0.6611) is set as the lower limit.
On the other hand, the partial dispersion ratio (θg, F) of the optical glass of the present invention is preferably (−2.50 × 10 −3 × ν d +0.6971), more preferably (−2.50 × 10 −3). × ν d +0.6921), more preferably (−2.50 × 10 −3 × ν d +0.6871) as the upper limit.
本発明の光学ガラスは、比重が小さいことが好ましい。より具体的には、本発明の光学ガラスの比重は５．５０［ｇ／ｃｍ３］以下であることが好ましい。これにより、光学素子やそれを用いた光学機器の質量が低減されるため、光学機器の軽量化に寄与できる。従って、本発明の光学ガラスの比重は、好ましくは５．５０、より好ましくは５．３０、好ましくは５．１０を上限とする。なお、本発明の光学ガラスの比重は、概ね３．００以上、より詳細には３．５０以上、さらに詳細には４．００以上であることが多い。
本発明の光学ガラスの比重は、日本光学硝子工業会規格ＪＯＧＩＳ０５−１９７５「光学ガラスの比重の測定方法」に基づいて測定する。
The optical glass of the present invention preferably has a small specific gravity. More specifically, the specific gravity of the optical glass of the present invention is preferably 5.50 [g / cm 3 ] or less. Thereby, since the mass of an optical element and an optical apparatus using the same is reduced, it can contribute to the weight reduction of an optical apparatus. Accordingly, the specific gravity of the optical glass of the present invention is preferably 5.50, more preferably 5.30, and preferably 5.10. The specific gravity of the optical glass of the present invention is generally about 3.00 or more, more specifically 3.50 or more, and more specifically 4.00 or more in many cases.
The specific gravity of the optical glass of the present invention is measured based on Japan Optical Glass Industry Association Standard JOGIS05-1975 “Measurement Method of Specific Gravity of Optical Glass”.
［ガラス成形体及び光学素子］
作製された光学ガラスから、例えば研磨加工の手段、又は、リヒートプレス成形や精密プレス成形等のモールドプレス成形の手段を用いて、ガラス成形体を作製することができる。すなわち、光学ガラスに対して研削及び研磨等の機械加工を行ってガラス成形体を作製したり、光学ガラスから作製したプリフォームに対してリヒートプレス成形を行った後で研磨加工を行ってガラス成形体を作製したり、研磨加工を行って作製したプリフォームや、公知の浮上成形等により成形されたプリフォームに対して精密プレス成形を行ってガラス成形体を作製したりすることができる。なお、ガラス成形体を作製する手段は、これらの手段に限定されない。
[Glass molding and optical element]
A glass molded body can be produced from the produced optical glass by means of, for example, polishing or molding press molding such as reheat press molding or precision press molding. That is, a glass molded body is manufactured by performing mechanical processing such as grinding and polishing on optical glass, or glass molding is performed by performing a polishing process after performing reheat press molding on a preform manufactured from optical glass. A glass molded body can be produced by producing a body, or by performing precision press molding on a preform produced by polishing or a preform formed by known float forming or the like. In addition, the means for producing the glass molded body is not limited to these means.
このように、本発明の光学ガラスから形成したガラス成形体は、様々な光学素子及び光学設計に有用であるが、その中でも特に、レンズやプリズム等の光学素子に用いることが好ましい。これにより、径の大きなガラス成形体の形成が可能になるため、光学素子の大型化を図りながらも、カメラやプロジェクタ等の光学機器に用いたときに高精細で高精度な結像特性及び投影特性を実現できる。 As described above, the glass molded body formed from the optical glass of the present invention is useful for various optical elements and optical designs, and among them, it is particularly preferable to use them for optical elements such as lenses and prisms. This makes it possible to form a glass molded body with a large diameter, so that the optical elements can be enlarged, but with high definition and high precision imaging characteristics and projection when used in optical equipment such as cameras and projectors. The characteristics can be realized.
本発明の実施例（Ｎｏ．１〜Ｎｏ．１１６）及び比較例（Ｎｏ．Ａ）の組成、並びに、これらのガラスの屈折率（ｎｄ）、アッベ数（νｄ）、部分分散比（θｇ，Ｆ）、液相温度、分光透過率が５％及び７０％を示す波長（λ５及びλ７０）並びに比重の結果を表１〜表１６に示す。なお、以下の実施例はあくまで例示の目的であり、これらの実施例のみ限定されるものではない。 Composition of Examples (No. 1 to No. 116) and Comparative Example (No. A) of the present invention, and the refractive index (n d ), Abbe number (ν d ), and partial dispersion ratio (θg) of these glasses F), liquid phase temperature, wavelengths (λ 5 and λ 70 ) at which the spectral transmittance is 5% and 70%, and specific gravity results are shown in Tables 1 to 16. The following examples are merely for illustrative purposes, and are not limited to these examples.
本発明の実施例及び比較例のガラスは、いずれも各成分の原料として各々相当する酸化物、水酸化物、炭酸塩、硝酸塩、弗化物、水酸化物、メタ燐酸化合物等の通常の光学ガラスに使用される高純度原料を選定し、表に示した各実施例の組成の割合になるように秤量して均一に混合した後、白金坩堝に投入し、ガラス組成の熔融難易度に応じて電気炉で１１００〜１５００℃の温度範囲で２〜５時間熔融した後、攪拌均質化してから金型等に鋳込み、徐冷してガラスを作製した。 The glasses of the examples and comparative examples of the present invention are ordinary optical glasses such as oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, and metaphosphate compounds corresponding to the raw materials of the respective components. The high-purity raw materials used in the above are selected, weighed so as to have the composition ratios of the respective examples shown in the table and mixed uniformly, and then put into a platinum crucible, depending on the melting difficulty of the glass composition. After melting in a temperature range of 1100 to 1500 ° C. for 2 to 5 hours in an electric furnace, the mixture was homogenized with stirring, cast into a mold or the like, and slowly cooled to produce glass.
ここで、実施例及び比較例のガラスの屈折率、アッベ数、及び部分分散比（θｇ，Ｆ）は、日本光学硝子工業会規格ＪＯＧＩＳ０１―２００３に基づいて測定した。そして、求められたアッベ数及び部分分散比の値について、関係式（θｇ，Ｆ）＝−ａ×νｄ＋ｂにおける、傾きａが０．００２５のときの切片ｂを求めた。ここで、屈折率、アッベ数、及び部分分散比は、徐冷降温速度を−２５℃／ｈｒにして得られたガラスについて測定を行うことで求めた。 Here, the refractive index, Abbe number, and partial dispersion ratio (θg, F) of the glasses of the examples and comparative examples were measured based on Japan Optical Glass Industry Association Standard JOGIS01-2003. And about the calculated | required Abbe number and the value of partial dispersion ratio, the intercept b in case the inclination a is 0.0025 in relational expression ((theta) g, F) =-a * (nu) d + b was calculated | required. Here, the refractive index, the Abbe number, and the partial dispersion ratio were determined by measuring the glass obtained at a slow cooling rate of -25 ° C / hr.
また、実施例及び比較例のガラスの透過率は、日本光学硝子工業会規格ＪＯＧＩＳ０２に準じて測定した。なお、本発明においては、ガラスの透過率を測定することで、ガラスの着色の有無と程度を求めた。具体的には、厚さ１０±０．１ｍｍの対面平行研磨品をＪＩＳＺ８７２２に準じ、２００〜８００ｎｍの分光透過率を測定し、λ５（透過率５％時の波長）及びλ７０（透過率７０％時の波長）を求めた。 Moreover, the transmittance | permeability of the glass of an Example and a comparative example was measured according to Japan Optical Glass Industry Association standard JOGIS02. In the present invention, the presence / absence and degree of coloration of the glass were determined by measuring the transmittance of the glass. More specifically, a face parallel polished product having a thickness of 10 ± 0.1 mm is measured for a spectral transmittance of 200 to 800 nm in accordance with JISZ8722, and λ 5 (wavelength when the transmittance is 5%) and λ 70 (transmittance). Wavelength at 70%).
また、実施例及び比較例のガラスの液相温度は、５０ｍｌの容量の白金製坩堝に３０ｃｃのカレット状のガラス試料を白金坩堝に入れて１３５０℃で完全に熔融状態にし、１３００℃〜１１６０℃まで１０℃刻みで設定したいずれかの温度まで降温して１２時間保持し、炉外に取り出して冷却した後直ちにガラス表面及びガラス中の結晶の有無を観察し、結晶が認められない一番低い温度を求めた。 The liquid phase temperature of the glass of the examples and comparative examples is as follows. A 30 cc cullet-shaped glass sample was put in a platinum crucible in a platinum crucible having a capacity of 50 ml and completely melted at 1350 ° C. 1300 ° C. to 1160 ° C. The temperature is lowered to any temperature set in increments of 10 ° C. and held for 12 hours. After taking out of the furnace and cooling, the glass surface and the presence or absence of crystals in the glass are observed immediately, and the lowest crystal is not observed. The temperature was determined.
また、実施例及び比較例のガラスの比重は、日本光学硝子工業会規格ＪＯＧＩＳ０５−１９７５「光学ガラスの比重の測定方法」に基づいて測定した。 Moreover, specific gravity of the glass of an Example and a comparative example was measured based on Japan Optical Glass Industry Association standard JOGIS05-1975 "measurement method of specific gravity of optical glass".
本発明の実施例の光学ガラスは、いずれも液相温度が１３００℃以下、より詳細には１２２０℃以下であり、所望の範囲内であった。このため、本発明の実施例の光学ガラスは、液相温度が低く、耐失透性が高いことが明らかになった。 All of the optical glasses of the examples of the present invention had a liquidus temperature of 1300 ° C. or lower, more specifically 1220 ° C. or lower, and were within a desired range. For this reason, it became clear that the optical glass of the Example of this invention has low liquidus temperature, and high devitrification resistance.
また、本発明の実施例の光学ガラスは、λ７０（透過率７０％時の波長）がいずれも５００ｎｍ以下、より詳細には３９１ｎｍ以下であった。また、本発明の実施例の光学ガラスは、λ５（透過率５％時の波長）がいずれも４００ｎｍ以下、より詳細には３４１ｎｍ以下であった。 The optical glasses of the examples of the present invention each had a λ 70 (wavelength at a transmittance of 70%) of 500 nm or less, more specifically 391 nm or less. In addition, in the optical glasses of the examples of the present invention, λ 5 (wavelength at 5% transmittance) was 400 nm or less, more specifically 341 nm or less.
また、本発明の実施例の光学ガラスは、いずれも屈折率（ｎｄ）が１．７５以上、より詳細には１．８５以上であるとともに、この屈折率は２．２０以下、より詳細には１．９５以下であり、所望の範囲内であった。 The optical glasses of the examples of the present invention all have a refractive index (n d ) of 1.75 or more, more specifically 1.85 or more, and this refractive index is 2.20 or less, more specifically. Was 1.95 or less, which was within the desired range.
また、本発明の実施例の光学ガラスは、いずれもアッベ数（νｄ）が３５以上、より詳細には３９以上であるとともに、このアッベ数は５０以下、より詳細には４２以下であり、所望の範囲内であった。 The optical glasses of the examples of the present invention all have an Abbe number (ν d ) of 35 or more, more specifically 39 or more, and this Abbe number is 50 or less, more specifically 42 or less. It was within the desired range.
また、本発明の実施例の光学ガラスは、いずれも部分分散比（θｇ，Ｆ）が（−２．５０×１０−３×νｄ＋０．６５７１）以上、より詳細には（−２．５０×１０−３×νｄ＋０．６６９１）以上であった。その反面で、本発明の実施例の光学ガラスの部分分散比（−２．５０×１０−３×νｄ＋０．６９７１）以下、より詳細には（−２．５０×１０−３×νｄ＋０．６７６１）以下であった。そのため、これらの部分分散比（θｇ，Ｆ）が所望の範囲内にあることがわかった。 Further, the optical glasses of the examples of the present invention all have a partial dispersion ratio (θg, F) of (−2.50 × 10 −3 × ν d +0.6571) or more, more specifically (−2.50). × 10 −3 × ν d +0.6691) or more. On the other hand, the partial dispersion ratio (-2.50 × 10 −3 × ν d +0.6971) or less of the optical glass of the embodiment of the present invention, more specifically (−2.50 × 10 −3 × ν d). +0.6761) or less. Therefore, it was found that these partial dispersion ratios (θg, F) are within a desired range.
また、本発明の実施例の光学ガラスは、いずれも比重が５．５０以下、より詳細には４．９６以下であり、所望の範囲内であった。 The optical glasses of the examples of the present invention all had a specific gravity of 5.50 or less, more specifically 4.96 or less, and were within a desired range.
従って、本発明の実施例の光学ガラスは、屈折率及びアッベ数が所望の範囲内にありながらも安価に作製でき、耐失透性が高く、着色が少なく、且つ比重が小さいことが明らかになった。 Therefore, it is clear that the optical glass of the embodiment of the present invention can be manufactured at a low cost while having a refractive index and an Abbe number within a desired range, has high resistance to devitrification, little coloring, and low specific gravity. became.
さらに、本発明の実施例の光学ガラスを用いて、ガラスブロックを形成し、このガラスブロックに対して研削及び研磨を行い、レンズ及びプリズムの形状に加工した。その結果、安定に様々なレンズ及びプリズムの形状に加工することができた。 Furthermore, a glass block was formed using the optical glass of the example of the present invention, and this glass block was ground and polished to be processed into the shape of a lens and a prism. As a result, it was possible to stably process into various lens and prism shapes.
以上、本発明を例示の目的で詳細に説明したが、本実施例はあくまで例示の目的のみであって、本発明の思想及び範囲を逸脱することなく多くの改変を当業者により成し得ることが理解されよう。 Although the present invention has been described in detail 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 (18)
Ｌｉ２Ｏ成分 ０〜１０．０％
ＺｎＯ成分 ０〜２５．０％
である請求項１記載の光学ガラス。 Li 2 O component in mass% 0 to 10.0%
ZnO component 0 to 25.0%
The optical glass according to claim 1.
Ｇｄ２Ｏ３成分 ０〜４０．０％
Ｙ２Ｏ３成分 ０〜３０．０％
Ｙｂ２Ｏ３成分 ０〜２０．０％
である請求項１又は２記載の光学ガラス。 Gd 2 O 3 component by mass% 0-40.0%
Y 2 O 3 component 0 to 30.0%
Yb 2 O 3 component 0 to 20.0%
The optical glass according to claim 1 or 2.
ＴｉＯ２成分 ０〜１５．０％
Ｎｂ２Ｏ５成分 ０〜２０．０％
ＷＯ３成分 ０〜２０．０％
である請求項１から５のいずれかに記載の光学ガラス。 TiO 2 component in mass% 0 to 15.0%
Nb 2 O 5 component 0 to 20.0%
WO 3 component 0-20.0%
The optical glass according to any one of claims 1 to 5.
Ｎａ２Ｏ成分 ０〜１０．０％
Ｋ２Ｏ成分 ０〜１０．０％
Ｃｓ２Ｏ成分 ０〜１０．０％
である請求項１から９のいずれかに記載の光学ガラス。 Na 2 O component in mass% 0 to 10.0%
K 2 O component 0 to 10.0%
Cs 2 O component 0 to 10.0%
The optical glass according to any one of claims 1 to 9.
ＭｇＯ成分 ０〜１０．０％
ＣａＯ成分 ０〜１０．０％
ＳｒＯ成分 ０〜１０．０％
ＢａＯ成分 ０〜２５．０％
である請求項１から１１のいずれかに記載の光学ガラス。 MgO component in mass% 0 to 10.0%
CaO component 0 to 10.0%
SrO component 0 to 10.0%
BaO component 0 to 25.0%
The optical glass according to any one of claims 1 to 11.
Ｐ２Ｏ５成分 ０〜１０．０％
ＧｅＯ２成分 ０〜１０．０％
ＺｒＯ２成分 ０〜１５．０％
Ａｌ２Ｏ３成分 ０〜１０．０％
Ｇａ２Ｏ３成分 ０〜１０．０％
Ｂｉ２Ｏ３成分 ０〜１０．０％
ＴｅＯ２成分 ０〜２０．０％
ＳｎＯ２成分 ０〜１．０％
Ｓｂ２Ｏ３成分 ０〜１．０％
である請求項１から１３のいずれか記載の光学ガラス。 P 2 O 5 component from 0 to 10.0% by mass%
GeO 2 component 0-10.0%
ZrO 2 component 0 to 15.0%
Al 2 O 3 component 0 to 10.0%
Ga 2 O 3 component from 0 to 10.0%
Bi 2 O 3 component 0 to 10.0%
TeO 2 component 0-20.0%
SnO 2 component 0-1.0%
Sb 2 O 3 component 0-1.0%
The optical glass according to any one of claims 1 to 13.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6501054B2 (en) * | 2014-06-30 | 2019-04-17 | 日本電気硝子株式会社 | Optical glass |
| JP6693726B2 (en) * | 2014-11-07 | 2020-05-13 | Hoya株式会社 | Glass, glass material for press molding, optical element blank, and optical element |
| JP6587286B2 (en) * | 2014-11-07 | 2019-10-09 | Hoya株式会社 | Glass, glass material for press molding, optical element blank, and optical element |
| JP6576657B2 (en) * | 2015-03-17 | 2019-09-18 | Hoya株式会社 | Optical glass and optical element |
| JP6626298B2 (en) * | 2015-09-18 | 2019-12-25 | 株式会社オハラ | Optical glass, preform and optical element |
| JP6910702B2 (en) * | 2016-07-14 | 2021-07-28 | 株式会社オハラ | Optical glass, preform materials and optical elements |
| JP6864731B2 (en) * | 2019-12-03 | 2021-04-28 | 光ガラス株式会社 | Optical glass, optical elements using optical glass, optical devices |
| CN111018343B (en) * | 2019-12-30 | 2023-02-03 | 湖北新华光信息材料有限公司 | Optical glass, preparation method thereof and optical component |
| CN115286238A (en) * | 2022-08-26 | 2022-11-04 | 成都光明光电股份有限公司 | Optical glass |
| CN115321814A (en) * | 2022-08-26 | 2022-11-11 | 成都光明光电股份有限公司 | Optical glass |
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| JP6560651B2 (en) | 2019-08-14 |
| JP2014062026A (en) | 2014-04-10 |
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