JP2013028532A5

JP2013028532A5 -

Info

Publication number: JP2013028532A5
Application number: JP2012233297A
Authority: JP
Filing date: 2012-10-22
Publication date: 2013-03-21
Anticipated expiration: 2028-01-31

Description

本発明者は、上記課題を解決するために、鋭意試験研究を重ねた結果、特定量のＳｉＯ_２、Ｎｂ_２Ｏ_５及びＺｒＯ _２を含有し、且つ、ＴｉＯ _２／（ＺｒＯ _２＋Ｎｂ _２Ｏ _５）の比率と、ＳｉＯ _２、Ｂ _２Ｏ _３、ＴｉＯ _２、ＺｒＯ _２、Ｎｂ _２Ｏ _５、ＷＯ _３、ＺｎＯ、ＳｒＯ、Ｌｉ _２Ｏ、Ｎａ _２Ｏの合計含有量を所定の範囲内にすることにより、前記の光学定数を有し、部分分散比が小さい光学ガラスが得られた。 In order to solve the above-described problems, the present inventor has conducted intensive studies and researches. As a result, the inventor contains specific amounts of SiO ₂ , Nb ₂ O ₅ and ZrO ₂ , and TiO ₂ / (ZrO ₂ + Nb ₂ O ₅ ) Ratio and the total content of SiO ₂ , B ₂ O ₃ , TiO ₂ , ZrO ₂ , Nb ₂ O ₅ , WO ₃ , ZnO, SrO, Li ₂ O, Na ₂ O within a predetermined range. Thus, an optical glass having the above optical constant and a small partial dispersion ratio was obtained.

本発明のガラスの実施例（Ｎｏ．１〜Ｎｏ．６６）の組成を、これらのガラスの屈折率（ｎｄ）、アッベ数（νｄ）、部分分散比（θｇ，Ｆ）、ガラス転移温度（Ｔｇ）、屈伏点（Ａｔ）および失透試験と共に表１〜表９に示した。このうち、実施例（Ｎｏ．１〜Ｎｏ．７、Ｎｏ．１０〜Ｎｏ．２０、Ｎｏ．２２、Ｎｏ．２３、Ｎｏ．４２、Ｎｏ．４３、Ｎｏ．４６、Ｎｏ．４７、Ｎｏ．５８、Ｎｏ．５９）は、本発明の参考例である。表中、各成分の組成は質量％で表示するものとする。 The composition of Examples (No. 1 to No. 66) of the glass of the present invention was changed to the refractive index (nd), Abbe number (νd), partial dispersion ratio (θg, F), and glass transition temperature (Tg) of these glasses. ), The yield point (At) and the devitrification test are shown in Tables 1 to 9. Among these, Examples (No. 1 to No. 7, No. 10 to No. 20, No. 22, No. 23, No. 42, No. 43, No. 46, No. 47, No. 58, No. 59) is a reference example of the present invention. In the table, the composition of each component is expressed in mass%.

Claims

Refractive index _{(n d)} of 1.78 or more, an Abbe's number ([nu _d) is 28 or less, the partial dispersion ratio ([theta] g, F) has an optical constant in the range of 0.620 or less, SiO in a ratio of mass% ₂ to 10% to 40% , Nb ₂ O ₅ to more than 40% to 65% or less, ZrO ₂ to 0.1% to 15% , and TiO ₂ / (ZrO ₂ + Nb ₂ O ₅ ) is 0.20 The total content of SiO ₂ , B ₂ O ₃ , TiO ₂ , ZrO ₂ , Nb ₂ O ₅ , WO ₃ , ZnO, SrO, Li ₂ O, Na ₂ O is more than 90%. And an optical glass ( excluding those having an Abbe number (ν _d ) of 28 or more) .

The optical glass according to claim 1, characterized in that K _{2 O} in weight percent ratio of oxide basis is less than 2%.

TiO2 by mass% based on oxide _２2 The optical glass according to claim 1, wherein the content of the glass is 0 to 15%.

The optical glass according to any one of claims 1 to 3, wherein the content of BaO is 0 to 15% by mass% based on oxide.

% By mass based on oxide,
Li _２2 O 0-15% and / or
Na _２2 O 0-20%
These optical components are contained, The optical glass of Claims 1-4 characterized by the above-mentioned.

% By mass based on oxide ,
B ₂ O ₃ 0~20% and / or _GeO 2 0% and / or _Al 2 _O 3 0~10% and / or
W O ₃ 0 to 15% and / or 0 to 15% ZnO and / or SrO 0 to 15% and / or
S b ₂ O ₃ 0~1%
These optical components are contained, The optical glass of Claims 1-5 characterized by the above-mentioned.

% By mass based on oxide,
Gd ₂ O ₃ 0~10% and / or _Y 2 _O 3 _0~10% and / or 0 to 15% MgO and / or CaO 0 to 15% and / or
G a ₂ O ₃ _0~10% and / or _CeO 2 0% and / or _TeO 2 0% and / or _Bi 2 _O 3 0~10%
The optical glass according to claim 1-6, characterized in that it contains the components of.

The optical glass according to claim 1 to 7 having a glass transition point (Tg), characterized in that at 650 ° C. or less.

Lens preform formed of the optical glass of any one of claims 1-8.

The lens preform material for mold press molding which consists of an optical glass in any one of Claims 1-8 .

An optical element formed of the optical glass of any one of claims 1-8.