JP2875709B2 - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JP2875709B2 JP2875709B2 JP5119132A JP11913293A JP2875709B2 JP 2875709 B2 JP2875709 B2 JP 2875709B2 JP 5119132 A JP5119132 A JP 5119132A JP 11913293 A JP11913293 A JP 11913293A JP 2875709 B2 JP2875709 B2 JP 2875709B2
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- Prior art keywords
- glass
- component
- optical
- chemical durability
- range
- Prior art date
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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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基本的にＳｉＯ2−Ｂ2
Ｏ3−Ｌａ2Ｏ3−Ｔａ2Ｏ5−ＺｎＯ−ＺｒＯ 2 −Ｎｂ 2 Ｏ 5
−ＷＯ 3 −Ｌｉ2Ｏ系からなり、屈折率（Ｎｄ）が１．７
５≦Ｎｄ＜１．８４、アッベ数（νｄ）が３８＜νｄ≦
５０の範囲の光学恒数を有し、かつ低転移温度特性を付
与してモールドプレス成形性を改善しつつ、化学的耐久
性に優れた新規な光学ガラスに関する。BACKGROUND OF THE INVENTION This invention is, basically SiO 2 -B 2
O 3 -La 2 O 3 -Ta 2 O 5 -ZnO -ZrO 2 -Nb 2 O 5
-WO 3 -Li made 2 O system, the refractive index (Nd) of 1.7
5 ≦ Nd <1.84, Abbe number (νd) is 38 <νd ≦
The present invention relates to a novel optical glass having an optical constant in the range of 50 , imparting a low transition temperature characteristic to improve mold press moldability, and having excellent chemical durability.
【０００２】[0002]
【従来の技術】従来、前記光学恒数を示すガラスは、硼
酸ランタン系組成のものが代表的であり、例えば特開昭
５０−１４７１２号および特開昭５５−１１６６４１号
等の公報にみられるように種々のガラスが開示されてい
る。しかしこれらのガラスは一般に転移温度（以下Ｔｇ
という）が高く６００℃を越えるため、近年要望されて
いる光学素子直接成形用のモールドプレス性に優れたガ
ラスとしては不適である。一般にＴｇの値は、ガラス熱
間成形性の難易度を左右する大きな要因となっている
が、軟化ガラスをプレス成形する場合、プレス金型はそ
のガラスのＴｇ近傍にさらされるため、ガラスのＴｇが
高いほど金型表面が酸化したり、金属組織に変化を生じ
急速に劣化して金型寿命が短くなりやすい。そこで前記
光学恒数を維持させながら、低Ｔｇ特性を与える目的で
種々のガラスが開発されている。例えば特開昭６０−２
２１３３８号公報には、Ｂ2Ｏ3−Ｌａ2Ｏ3−Ｙ2Ｏ3−Ｌ
ｉ2Ｏ−Ｒ″Ｏ（Ｒ″は２価のアルカリ土類酸化物及び
／又は２価の金属酸化物）系ガラスが開示されている
が、このガラスは、耐失透性は改善されているものの化
学的耐久性が十分でない。2. Description of the Related Art Heretofore, glass having the above-mentioned optical constant has a lanthanum borate-based composition, for example, as disclosed in Japanese Patent Application Laid-Open Nos. 50-14712 and 55-116641. Thus, various glasses have been disclosed. However, these glasses generally have a transition temperature (hereinafter, Tg).
Is high and exceeds 600 ° C., which is unsuitable as a glass which has been recently required and has excellent mold pressability for direct molding of optical elements. In general, the value of Tg is a major factor that determines the degree of difficulty in hot forming of glass. However, when press-forming softened glass, the pressing mold is exposed to the vicinity of Tg of the glass. The higher the value, the more easily the mold surface is oxidized and the metal structure is changed, and the mold is rapidly deteriorated to shorten the mold life. Therefore, various glasses have been developed for the purpose of providing low Tg characteristics while maintaining the optical constant. For example, JP-A-60-2
No. 21338 discloses that B 2 O 3 —La 2 O 3 —Y 2 O 3 —L
i 2 O-R "O ( R" is a divalent alkaline earth oxides and / or divalent metal oxides) but based glass is disclosed, the glass, the devitrification resistance is improved But the chemical durability is not sufficient.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、前記従来の
ガラスにみられる諸欠点を改善し、屈折率（Ｎｄ）が
１．７５≦Ｎｄ＜１．８４、アッベ数（νｄ）が３８＜
νｄ≦５０の範囲の光学恒数とモールドプレスに適合す
る低Ｔｇ特性を維持させつつ、一段と優れた化学的耐久
性を有する光学ガラスを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional glass, and has an improved refractive index (Nd).
1.75 ≦ Nd <1.84, Abbe number (νd) is 38 <
An object of the present invention is to provide an optical glass having further excellent chemical durability while maintaining an optical constant in the range of νd ≦ 50 and a low Tg characteristic suitable for a mold press.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、本発明者等は鋭意試験研究を重ねた結果、従来には
具体的に開示されていない特定組成範囲のＳｉＯ2−Ｂ2
Ｏ3−Ｌａ2Ｏ3−Ｔａ2Ｏ5−ＺｎＯ−ＺｒＯ 2 −Ｎｂ 2 Ｏ 5
−ＷＯ 3 −Ｌｉ2Ｏ系ガラスにおいて、前記所定の光学恒
数とモールドプレスに適した低Ｔｇ特性を維持しつつ、
ガラスの化学的耐久性を一段と改善した所望のガラスが
得られることをみいだし、本発明をなすに至った。Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies and studied and found that SiO 2 -B 2 having a specific composition range which has not been specifically disclosed hitherto.
O 3 -La 2 O 3 -Ta 2 O 5 -ZnO -ZrO 2 -Nb 2 O 5
In -WO 3 -Li 2 O-based glass, while maintaining a low Tg characteristics suitable for the desired optical constants and the mold press,
It has been found that a desired glass having further improved chemical durability of the glass can be obtained, and the present invention has been accomplished.
【０００５】本発明にかかる光学ガラスの特徴は、重量
％で、ＳｉＯ2 ６〜１５％、Ｂ2Ｏ3 １５．５〜２４
％、 ただしＳｉＯ2＋Ｂ2Ｏ3 ２１．５〜３５％、Ｌａ
2Ｏ3２５〜５０％、Ｇｄ2Ｏ3 ０〜３０％、ただしＬａ
2Ｏ3＋Ｇｄ2Ｏ3 ２７〜６０％、Ｔａ2Ｏ5 ０．１〜１
０％、ＺｎＯ １４．５〜２５％、ＺｒＯ2 １．５〜
１０％、Ｎｂ2Ｏ5 ０．５〜１５％、ＷＯ3 ０．５〜
５％、Ｌｉ2Ｏ ０． ６〜５％、Ａｌ2Ｏ3 ０〜１０
％、ＴｉＯ2 ０〜３％、Ｙｂ 2 Ｏ 3 ０〜１０％、Ｆ 2
０〜５％の範囲の各成分からなり、かつ屈折率（Ｎｄ）
が１．７５≦Ｎｄ＜１．８４、アッベ数（νｄ）が３８
＜νｄ≦５０の範囲の光学恒数と、５８０℃以下の転移
温度（Ｔｇ）を有するところにある。The optical glass according to the present invention is characterized in that, by weight%, SiO 2 is 6 to 15% and B 2 O 3 is 15.5 to 24.
%, But SiO 2 + B 2 O 3 21.5 to 35%, La
2 O 3 25~50%, Gd 2 O 3 0~30%, provided that La
2 O 3 + Gd 2 O 3 27~60%, Ta 2 O 5 0.1~1
0%, ZnO 14.5 ~25%, ZrO 2 1.5 ~
10%, Nb 2 O 5 0.5 to 15%, WO 3 0.5 to
5%, Li 2 O 0. 6 ~5%, Al 2 O 3 0~10
%, TiO 2 0~3%, Yb 2 O 3 0~10%, F 2
Consist each component of 0-5% range and a refractive index (Nd)
1.75 ≦ Nd <1.84, Abbe number (νd) is 38
<Νd ≦ 50 and a transition temperature (Tg) of 580 ° C. or less.
【０００６】つぎに各成分の含有量を上記のとおり限定
した理由について述べる。すなわち、ＳｉＯ2成分は、
その量が６％未満であるとガラスの化学的耐久性が低下
し、またその量が１５％を超えると低Ｔｇ特性を維持し
得なくなる。Ｂ2Ｏ3成分はガラスに低Ｔｇを与えるのに
有利なガラス形成成分であるが、その量はガラスの耐失
透性と化学的耐久性維持のため、１５．５〜２４％とす
べきである。ただし、ＳｉＯ2とＢ2Ｏ3成分の合計量
は、ガラスの耐失透性と目標の光学恒数維持のため２
１．５〜３５％、好ましくは２１．５〜３０％の範囲と
する。Next, the reasons for limiting the content of each component as described above will be described. That is, the SiO 2 component is
If the amount is less than 6%, the chemical durability of the glass decreases, and if the amount exceeds 15%, low Tg characteristics cannot be maintained. While B 2 O 3 component is an advantageous glass-forming components to provide a low Tg in the glass, the amount is for maintaining devitrification resistance and chemical durability of the glass, it should be 15.5 to 24% It is. However, the total amount of the SiO 2 and B 2 O 3 components is 2 to maintain the devitrification resistance of the glass and to maintain the target optical constant.
The range is 1.5 to 35%, preferably 21.5 to 30%.
【０００７】Ｌａ2Ｏ3成分はガラスの屈折率を目標の値
にするため２５％以上含有させる必要があるが、その量
が５０％を超えるとガラスは失透しやすくなる。Ｇｄ2
Ｏ3成分はＬａ2Ｏ3成分と同様の光学特性をガラスに与
えるので添加し得るが、その量が３０％を超えるとガラ
スは失透しやすくなる。ただし、Ｌａ2Ｏ3とＧｄ2Ｏ3成
分の合計量は、目標の光学恒数と耐失透性維持のため２
７〜６０％、好ましくは３２〜６０％の範囲とする。The La 2 O 3 component must be contained in an amount of at least 25% in order to bring the refractive index of the glass to a target value. However, if the amount exceeds 50%, the glass tends to be devitrified. Gd 2
The O 3 component can be added because it gives the glass the same optical properties as the La 2 O 3 component. However, if the amount exceeds 30%, the glass tends to be devitrified. However, the total amount of the La 2 O 3 and Gd 2 O 3 components is 2 to maintain the target optical constant and devitrification resistance.
The range is 7 to 60%, preferably 32 to 60%.
【０００８】本発明において、Ｔａ2Ｏ5成分は後述のＺ
ｎＯ成分とともにガラスに含有させることによって、所
定のＴｇを維持させつつ大幅に化学的耐久性を改善させ
る効果がみいだされた重要成分である。その量が０．１
％未満ではその効果が十分でなく、またその量が１０％
を超えるとガラスは耐失透性が悪化する。上記効果を得
るためには０．５％以上含有させることが好ましい。[0008] In the present invention, the Ta 2 O 5 component is Z
This is an important component that has been found to have an effect of significantly improving the chemical durability while maintaining a predetermined Tg by being contained in the glass together with the nO component. The amount is 0.1
%, The effect is not sufficient, and the amount is 10%.
If it exceeds 50, the glass will have poor devitrification resistance. In order to obtain the above-mentioned effects, it is preferable to contain 0.5% or more.
【０００９】ＺｎＯ成分はガラスの耐失透性、溶融性の
改善の点で有利な重要な成分であり、上記のとおり、Ｔ
ａ2Ｏ5成分と共に含有させて化学的耐久性向上を著しく
するが、その量は１４．５〜２５％の範囲が有効であ
る。さらに、請求項２に記載の発明のように、Ｔａ 2 Ｏ 5
／ＺｎＯの比率を０．１〜０．７の範囲に限定すること
により、一段と化学的耐久性に優れたガラスが得られ
る。 The ZnO component is an important component which is advantageous in improving the devitrification resistance and melting property of the glass.
a 2 O 5 is contained together with the component significantly chemical durability improved, but the amount is effective in the range of 14.5 to 25%. Furthermore, as in the invention according to claim 2, Ta 2 O 5
/ ZnO ratio is limited to the range of 0.1 to 0.7
Provides a glass with even higher chemical durability
You.
【００１０】ＺｒＯ2成分はガラスの光学恒数の調整、
化学的耐久性の改善のため添加するが１０％までで十分
である。また、その量が１．５％未満では上記効果が十
分でない。Ｎｂ2Ｏ5成分はガラスの屈折率を高め、化学
的耐久性を改善するのに有効であるが、１５％を超える
とガラスは失透しやすくなる。上記効果を得るためには
Ｎｂ 2 Ｏ 5 成分を０．５％以上含有させる必要がある。Ｗ
Ｏ3成分はガラスの屈折率を高め失透傾向を抑制し、溶
融ガラスの粘性を小さくする効果があるが、５％を超え
るとガラスの着色傾向が増大する。上記効果を得るため
には、ＷＯ 3 成分を０．５％以上含有させる必要があ
る。The ZrO 2 component controls the optical constant of the glass,
It is added to improve chemical durability, but up to 10% is sufficient. If the amount is less than 1.5%, the above effect is not sufficient.
Not a minute. The Nb 2 O 5 component is effective for increasing the refractive index of the glass and improving the chemical durability, but when the content exceeds 15%, the glass is apt to be devitrified. To get the above effect
It is necessary to contain 0.5% or more of Nb 2 O 5 component . W
The O 3 component has the effect of increasing the refractive index of the glass, suppressing the tendency of devitrification, and reducing the viscosity of the molten glass. To obtain the above effects, it must be contained WO 3 ingredient 0.5% or more
You .
【００１１】Ｌｉ2Ｏ成分はガラスに低Ｔｇ特性を与え
る効果が特に大きいので重要な成分であるが、ガラスの
耐失透性を維持しつつその効果を発揮させるためには、
その量は０．６〜５％の範囲にすべきである。Ａｌ2Ｏ3
成分は化学的耐久性向上に有効な成分であるので、１０
％まで含有させることができる。しかし、その量が多く
なると溶融ガラスの粘性が大きくなり過ぎるので５％以
下が好ましい。The Li 2 O component is an important component because it has a particularly large effect of imparting low Tg characteristics to glass, but in order to maintain the devitrification resistance of the glass and exert its effect,
The amount should be in the range 0.6 5%. Al 2 O 3
Since the components are effective for improving the chemical durability, 10
%. However, if the amount increases, the viscosity of the molten glass becomes too large, so that the content is preferably 5% or less.
【００１２】ＴiＯ2成分はガラスの化学的耐久性を向上
させるのに有効であり、３％まで含有させることができ
る。なお、本発明の光学ガラスに所望の特性を損なわな
い範囲で、Ｙｂ2Ｏ3 成分を１０％まで、Ｆ2 成分を５％
まで添加し得る。また脱泡清澄剤として、Ｓｂ2Ｏ3、Ａ
ｓ2Ｏ3等の成分を適量添加し得る。The TiO 2 component is effective for improving the chemical durability of glass, and can be contained up to 3%. The Yb 2 O 3 component is up to 10% and the F 2 component is 5%, as long as the desired properties of the optical glass of the present invention are not impaired.
Can be added . As defoaming fining agents, Sb 2 O 3 , A
Components such as s 2 O 3 can be added in appropriate amounts.
【００１３】[0013]
【実施例】つぎに、本発明の光学ガラスにかかる実施組
成例（Ｎｏ．１〜Ｎｏ．３）および前記従来の光学ガラ
スの比較組成例（Ｎｏ．ＡおよびＮｏ．Ｂ）をこれらの
ガラスの光学恒数（Ｎｄ、νｄ）および耐酸性（ＳＲ）
数値とともに表１に示した。 なお、上記ＳＲ値は、国
際標準化機構ＩＳＯ８４２４；１９８７（Ｅ）の測定方
法に準拠し、測定して得た結果を表したものである。こ
こで、ＳＲ値は所定の酸処理液中におけるガラス試料が
０．１μｍの浸食を受けるのに要した時間（ｈ）によっ
て等級付けしたものである。ＳＲ値＝４および５の場合
はＰＨ０．３の硝酸溶液を用い、それぞれ０．１〜１ｈ
および０．１ｈ以下を要したことを示す。また、ＳＲ値
＝５、５１、５２および５３の場合はいずれもＰＨ４．
６の酢酸緩衝液を用い、それぞれ１０ｈ以上、１〜１０
ｈ、０．１〜１ｈおよび０．１ｈ以下を要したことを示
している。EXAMPLES Next, Examples (No. 1 to No. 3 ) of the optical glass of the present invention and Comparative Examples (No. A and No. B) of the above-mentioned conventional optical glass will be described. Optical constant (Nd, νd) and acid resistance (SR)
The results are shown in Table 1 together with the numerical values. In addition, the said SR value represents the result obtained by measuring based on the measuring method of International Organization for Standardization ISO8424; 1987 (E). Here, the SR value is graded according to the time (h) required for a glass sample in a predetermined acid treatment liquid to undergo erosion of 0.1 μm. In the case of SR values = 4 and 5, use a nitric acid solution with a pH of 0.3 for 0.1 to 1 hour, respectively.
And 0.1 h or less. When SR value = 5, 51, 52 and 53, PH4.
6 for 10 h or more, 1-10
h, 0.1 to 1 h and 0.1 h or less were required.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１にみられるとおり、本発明の実施組成
例のガラスは、比較組成例のガラス、Ｎｏ．ＡおよびＮ
ｏ．Ｂと比較するといずれもＳＲ値が向上し、一段と優
れた化学的耐久性を示している。また、これらの本発明
の実施組成例のガラスはいずれも耐失透性に優れ、また
均質化し易く、５４０〜５６５℃の範囲の転移温度（Ｔ
ｇ）を有している。このため、上記実施組成例のガラス
は製造が容易であり、モールドプレスに適しているう
え、優れた化学的耐久性を有している。なお、本発明の
上記実施組成例のガラスは、いずれも硝酸塩、炭酸塩、
酸化物等の通常の光学ガラス原料を用いて秤量・混合
し、これを白金坩堝を用いて約１１００〜１３５０℃、
約２〜５時間で溶融脱泡し、攪拌均質化した後、金型に
鋳込み徐冷することにより得ることができる。As can be seen from Table 1, the glass of the working composition of the present invention is the same as the glass of the comparative composition . A and N
o. In each case, the SR value was improved as compared with B, indicating even more excellent chemical durability. In addition , these inventions
Any of the exemplary glass composition example is excellent in devitrification resistance, also rather easily homogenized, transition temperature in the range of five hundred forty to five hundred sixty-five ° C. (T
g). For this reason, the glass of the above-mentioned composition example is easy to manufacture, is suitable for a mold press, and has excellent chemical durability. Incidentally, the glasses of the above-mentioned composition examples of the present invention are all nitrate, carbonate,
Weighing and mixing using ordinary optical glass materials such as oxides, and then using a platinum crucible at about 1100 to 1350 ° C,
It can be obtained by melting and defoaming in about 2 to 5 hours, stirring and homogenizing, then casting into a mold and gradually cooling.
【００１６】[0016]
【発明の効果】以上に述べたとおり、本発明の光学ガラ
スは、ＳｉＯ2−Ｂ2Ｏ3−Ｌａ2Ｏ3−Ｔａ2Ｏ5−ＺｎＯ
−ＺｒＯ 2 −Ｎｂ 2 Ｏ 5 −ＷＯ 3 −Ｌｉ2Ｏ系成分系の特定
組成範囲を有するものであるから、屈折率（Ｎｄ）１．
７５≦Ｎｄ＜１．８４、アッベ数（νｄ）３８＜νｄ≦
５０の範囲の光学恒数と５８０℃以下の転移温度（Ｔ
ｇ）とを有し、かつ、国際標準化機構ＩＳＯ８４２４；
１９８７（Ｅ）の測定方法に準拠して測定した、ＰＨ
４．６の酢酸緩衝液を用いて０．１μｍの浸食を受ける
のに要する時間（ｈ）が、１時間（ｈ）以上であって化
学的耐久性に一段と優れている。また耐失透性に優れ、
製造が容易であり均質化し易く、モールドプレスに適し
ている。As described above, the optical glass of the present invention has a composition of SiO 2 —B 2 O 3 —La 2 O 3 —Ta 2 O 5 —ZnO.
Since those having a -ZrO 2 -Nb 2 O 5 -WO 3 -Li 2 O system specific composition range of component systems, the refractive index (Nd) 1.
75 ≦ Nd <1.84, Abbe number (νd) 38 <νd ≦
An optical constant in the range of 50 and a transition temperature ( T
g ) and the International Organization for Standardization ISO 8424;
PH measured according to the measurement method of 1987 (E)
Subject to 0.1 μm erosion using 4.6 acetate buffer
(H) is 1 hour (h) or more, and the chemical durability is further improved. Also has excellent devitrification resistance,
It is easy to manufacture and easy to homogenize and suitable for mold press.
フロントページの続き (56)参考文献 特開 昭60−221338（ＪＰ，Ａ) 特開 昭60−21828（ＪＰ，Ａ) 特開 昭58−125636（ＪＰ，Ａ) 特開 昭52−103412（ＪＰ，Ａ) 特開 平５−58669（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C03C 3/068 Continuation of the front page (56) References JP-A-60-221338 (JP, A) JP-A-60-21828 (JP, A) JP-A-58-125636 (JP, A) JP-A-52-103412 (JP, A) , A) JP-A-5-58669 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C03C 3/068
Claims (2)
3 １５．５〜２４％、 ただしＳｉＯ2＋Ｂ2Ｏ3 ２
１．５〜３５％、Ｌａ2Ｏ3 ２５〜５０％、Ｇｄ2Ｏ3
０〜３０％、ただしＬａ2Ｏ3＋Ｇｄ2Ｏ3 ２７〜６０
％、Ｔａ2Ｏ5 ０．１〜１０％、ＺｎＯ １４．５〜２
５％、ＺｒＯ2 １．５〜１０％、Ｎｂ2Ｏ5 ０．５〜
１５％、ＷＯ3 ０．５〜５％、Ｌｉ2Ｏ ０．６〜５
％、Ａｌ2Ｏ3０〜１０％、ＴｉＯ2 ０〜３％、Ｙｂ 2 Ｏ
3 ０〜１０％、Ｆ 2 ０〜５％の範囲の各成分からな
り、かつ屈折率（Ｎｄ）が１．７５≦Ｎｄ＜１．８４、
アッベ数（νｄ）が３８＜νｄ≦５０の範囲の光学恒数
と、５８０℃以下の転移温度（Ｔｇ）を有することを特
徴とする光学ガラス。1% by weight of SiO 2 6-15%, B 2 O
3 15.5 to 24%, provided that SiO 2 + B 2 O 3 2
1.5 ~35%, La 2 O 3 25~50%, Gd 2 O 3
0% to 30%, with the proviso that La 2 O 3 + Gd 2 O 3 27~60
%, Ta 2 O 5 0.1~10% , ZnO 14.5 ~2
5%, ZrO 2 1.5 to 10%, Nb 2 O 5 0.5 to
15%, WO 3 0.5 ~5% , Li 2 O 0.6 ~5
%, Al 2 O 3 0~10% , TiO 2 0~3%, Yb 2 O
3 0 to 10%, each component of the F 2 0 to 5% of the range Tona
And the refractive index (Nd) is 1.75 ≦ Nd <1.84;
An optical glass having an optical constant in the range of 38 <νd ≦ 50 with an Abbe number (νd) and a transition temperature (Tg) of 580 ° C. or less.
７であることを特徴とする請求項１に記載の光学ガラ
ス。2. The method according to claim 1, wherein the ratio of Ta 2 O 5 / ZnO is 0.1 to 0.1.
The optical glass according to claim 1, characterized in that the 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5119132A JP2875709B2 (en) | 1993-04-22 | 1993-04-22 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5119132A JP2875709B2 (en) | 1993-04-22 | 1993-04-22 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06305769A JPH06305769A (en) | 1994-11-01 |
| JP2875709B2 true JP2875709B2 (en) | 1999-03-31 |
Family
ID=14753736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5119132A Expired - Lifetime JP2875709B2 (en) | 1993-04-22 | 1993-04-22 | Optical glass |
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| Country | Link |
|---|---|
| JP (1) | JP2875709B2 (en) |
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| JPH11271513A (en) * | 1998-03-23 | 1999-10-08 | Minolta Co Ltd | Diffracting optical element |
| JP3750984B2 (en) * | 2000-05-31 | 2006-03-01 | Ｈｏｙａ株式会社 | Optical glass and optical product manufacturing method |
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| JP4003874B2 (en) * | 2001-10-24 | 2007-11-07 | Ｈｏｙａ株式会社 | Optical glass, press-molding preforms and optical components |
| JP3912774B2 (en) * | 2002-03-18 | 2007-05-09 | Ｈｏｙａ株式会社 | Optical glass for precision press molding, preform for precision press molding and manufacturing method thereof |
| US7232779B2 (en) | 2002-08-20 | 2007-06-19 | Hoya Corporation | Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same |
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| JP4739721B2 (en) * | 2003-11-17 | 2011-08-03 | 株式会社オハラ | Optical glass |
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| TW200813467A (en) * | 2006-06-13 | 2008-03-16 | Asahi Glass Co Ltd | Optical glass and lens using the same |
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| JP2011246337A (en) * | 2010-04-30 | 2011-12-08 | Ohara Inc | Optical glass, optical element and method for manufacturing molded glass article |
| TWI594966B (en) * | 2010-10-08 | 2017-08-11 | Ohara Kk | Optical glass, preform and optical element |
| JP2012041268A (en) * | 2011-11-14 | 2012-03-01 | Ohara Inc | Optical glass |
| JP6618692B2 (en) | 2015-03-17 | 2019-12-11 | Hoya株式会社 | Optical glass and optical element |
| JP6903373B2 (en) * | 2015-11-06 | 2021-07-14 | 株式会社オハラ | Optical glass, preform materials and optical elements |
| JP6866012B2 (en) * | 2015-11-06 | 2021-04-28 | 株式会社オハラ | Optical glass, preform materials and optical elements |
| JP6910702B2 (en) * | 2016-07-14 | 2021-07-28 | 株式会社オハラ | Optical glass, preform materials and optical elements |
| CN107879620B (en) * | 2016-09-29 | 2020-12-29 | 成都光明光电股份有限公司 | Optical glass, glass preform and optical element |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52103412A (en) * | 1976-02-26 | 1977-08-30 | Obara Optical Glass | Optical glass |
| DE3201346C2 (en) * | 1982-01-18 | 1986-03-13 | Schott Glaswerke, 6500 Mainz | Highly refractive optical glasses with refractive indices of 1.84 - 1.87 and Abbe numbers of 30 - 33 in the system SiO 2 -B 2 O 3 -Alkalioxid-Erdalkalioxid / ZnO-PbO-La 2 O 3 ; -ZrO 2 -TiO 2 -Nb 2 O 5 |
| JPS6021828A (en) * | 1983-07-14 | 1985-02-04 | Hoya Corp | Glass for spectacle lens |
| JPS60221338A (en) * | 1984-04-12 | 1985-11-06 | Ohara Inc | Optical glass |
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1993
- 1993-04-22 JP JP5119132A patent/JP2875709B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH06305769A (en) | 1994-11-01 |
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