TW201226355A - Optical glass, optical element and perform - Google Patents

Abstract

The present invention provides an optical glass, an optical element and a perform, which can correct the aberration of glass lenses more precisely due to having higher abnormal dispersivity, thereby providing the high reflectivity and the low dispersivity (the high Abbe number), as well as the wear and tear lower than or equal to those of prior arts to allow its grinding process more easily. The optical glass of the present invention contains, as the cation content, at least one selected from the group consisting of P5+, Al3+, Ca2+, Ln3+ (Ln3+ is at least one selected from the group consisting of Y3+, La3+, Gd3+, Yb3+ and Lu3+), Mg2+, Sr2+, and Ba2+, wherein the total content percentage of Ln3+ is greater than 1.1% and less than 10.0% based on the cation percentage, and F- as the anion, and has a reflectivity (nd) greater than or equal to 1.55 and an Abbe number (vd) greater than or equal to 55.

Description

201226355 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical glass, an optical element, and a preform. [Prior Art] An optical lens system is usually designed by combining a plurality of glass lenses having different optical properties. In recent years, the characteristics required for the lens system of an optical device are diversifying, and the degree of freedom in design has been expanded in two steps. Therefore, an optical glass having an optical characteristic that has not been previously noticed has been developed. Among them, an optical glass which is characterized by anomalous dispersion (,, F) has been attracting attention as a color correction effect for aberrations. For example, in Patent Literatures 1 to 3, an optical glass having high refractive index and low dispersibility and excellent workability, and having high dispersibility, is proposed to contain, for example, p' A13+, soil-suppressed metal. An optical glass containing an ion or the like as a cationic component and containing F and 〇2- as an anion component. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. 2007-55883 (Patent Document 2) Japanese Patent Laid-Open Publication No. Hei. No. Hei. [Problems to be Solved by the Invention] However, in the prior optical glass described in Patent Documents 1 to 3, the degree of abnormal dispersion is not sufficient, and the industry is expected to develop a higher anomalous dispersion property. Optical glass.

15308l.doc , S 201226355 The object of the present invention is to solve the problems as described above. That is, an object of the present invention is to provide an optical glass, an optical element, and a preform which can correct the chromatic aberration of the glass lens with high precision due to higher anomalous dispersion, and further have a high refractive index and a low dispersion (high Abbey). In addition, the degree of wear is low and equals or exceeds the former, so that the grinding process is easy. [Means for Solving the Problem] The present inventors have actively studied the present invention to solve the above problems, and have completed the present invention. The present invention is the following (1) to (11). (1) An optical glass comprising, as a cationic component, a substance selected from the group consisting of p5+, Al3+'Ca2+, Ln3+ (Ln3+ is selected from at least one of Y3+, La3+, Gd3+, Yb3+, and Lu3+) and Mg2+, At least one of a group consisting of heart 2+ and Ba 2+ ;

The total content of Ln3+ is expressed as a percentage of cations greater than u% and 1 〇·〇% or less; as an anionic component, F-; refractive index (nd) 2 1.55, Abbe number (vd) 55. (2) The optical glass according to (1) above, wherein the cationic component is expressed as a percentage of cations, and contains: p5+ : 25-50%

Al3+ * 5-15%

Ca2+: Bu 8〇/〇r2+ : 30-70% (R2+ means Ca2++Mg2++Sr2++Ba2+); 153081.doc 201226355 G(j3: greater than 0% and 10.0% or less; as an anionic component, The percentage of anion is expressed as: F · 15 to 40%. (3) The optical glass of (1) or (2) above, wherein Y3+, u3+,

The content ratio of each cation component of Yb and Lu3+ satisfies the following relationship: Gd3+/(Y3 + + La3 + + Gd3+ + Yb3 + + Lu3, > 〇 74. (4) Any of the above (1) to (3) And the optical glass of any one of the above (1) to (4), wherein the optical glass is not included. The optical glass according to any one of the above (1) to (5), wherein the optical glass of any one of the above (1) to (6), wherein the degree of wear is 5 1 〇 or less (8) An optical element comprising the optical glass according to any one of the above (1) to (7). (9) A preform for polishing processing and/or precision press molding, comprising the above ( The optical glass of any one of (1) to (7). (10) An optical element which is obtained by grinding a preform of the above (9). (11) An optical element which is precisely pressed as described above (9) Preforms of the invention. [Effects of the Invention] According to the present invention, an optical glass, an optical element, and a preform can be provided, which are highly accurate due to higher anomalous dispersion. Correcting the chromatic aberration of the glass lens and further having a high refractive index and a low dispersion (high Abbe number), in addition, the wear of 153081.doc 201226355 is lower than or equal to the previous one's, so that the polishing process is easy [Embodiment] The present invention is directed to an optical glass comprising, as a cationic component, a substance selected from the group consisting of P5+, Al3+, Ca2+, and Ln3+ (Ln3+ is selected from the group consisting of Y3+, La3+, Gd3+,

At least one of the group consisting of Yb3 and Lu3+ and at least one of the groups consisting of Mg2+, sp+, and By+, the total content of Ln3+ is expressed as a ratio of cations to 1/3, and is represented as an anion component. ; 7, and the refractive index (nd) g 1.55, Abbe number (Vd) g 55. Hereinafter, such an optical glass is also referred to as "the optical glass of the present invention". <Glass component> The respective components constituting the optical glass of the present invention will be described. In the present specification, the content of each component is expressed by a percentage of a cation or an anion based on a molar ratio, unless otherwise specified. Here, the "percentage of cation" and "percentage of anion means that the glass constituent component of the optical glass of the present invention is separated into a cation" component and an anionic component', and the total ratio of each is set to (10) mol%, and represents a glass order. The composition of each component contained. Furthermore, the ion valence of each D is used for convenience, and the representative value is not different from other ion valences. The value of the ion of each component present in the optical glass may be a value other than the representative value, usually in the form of an ion valence: state exists in the glass 'so it is expressed as /" in the present specification but it is possible to use other ions The state of the price exists. As a result, strictly speaking, even if it exists in the state of other ion valence, it is treated as a representative value of the ion value in the optical glass in the case of the above-mentioned specification 15308I.doc 201226355. [Regarding the cation component] <p5+> The optical glass of the present invention contains a ρ5 lanthanum-based glass forming component, and has a property of suppressing devitrification of the glass, increasing the refractive index, and suppressing the decrease in the Abbe number. Since the above properties are strong, the content of Ρ5+ is preferably 0_0/. Further, it is more preferably 26.0 〇 / 〇 or more, and still more preferably 28 〇 % or more. Further, it is more preferably 48.0% or less, and still more preferably 47% or less. P5+ can be used as a raw material, for example, ai(p〇3)3, Ca(P〇3)2, Ba(p〇3)2, Zn(p〇3)2, BP〇4, H3P〇4, etc. Inside. <ai3+> The optical glass of the present invention contains barium, 3, and 3*, which has improved resistance to devitrification, refractive index, and Abbe number of the glass, and reduces the degree of wear, thereby improving the workability. Therefore, the content of Al3+ is preferably 5.0 to 15.0%. Further, it is more preferably 6.0% or more, and still more preferably 7 % by weight or more. Further, it is more preferably 13.0% or less, still more preferably 12.0% or less.

Al3 + can be contained in the glass using, for example, Al(P〇3)3, AIF3, Al2〇3 or the like as a raw material. <Soil Testing Metal> In the present invention, the soil-measuring metal means Ca2+, Mg2+, Sr2+, and Ba2+, and is sometimes referred to as R2+. Further, the total content of r2+ refers to the total content of the four ions (Ca2++Mg2++Sr2++Ba2+). 153081.doc 201226355 The optical glass of the present invention contains one of R2 + (physical soil), and further contains at least one selected from the group consisting of Mg2+, Sr2+, and Ba2+. Further, the total content of R2+ is preferably from 30.0 to 70.0%, more preferably from 33.0 to 70.0%. The reason for this is that if the content ratio is within this range, a more stable glass can be obtained. The total content of R2+ is more preferably 35.0% or more, and still more preferably 38.0% or more. Further, it is more preferably 65.0% or less, and still more preferably 60.0% or less. <Ca2+> The optical glass of the present invention must contain Ca2 and Ca2+ to improve the resistance to devitrification, suppress the decrease in the refractive index, and lower the wear of the glass. Since the above properties are strong, the content of Ca2+ is preferably from 1.0% to 8.0%. Further, it is more preferably 2.0% or more, and still more preferably 3% by weight or more. Further, it is more preferably 7.0% or less, and still more preferably 6.0% or less. Further, when Ca2+ is mixed with other alkaline earth metals, that is, at least one selected from the group consisting of Mg2+, 2+ and Ba2+, the devitrification resistance of the glass is improved, and the decrease in the refractive index is suppressed and the reduction is suppressed. The nature of the degree of wear, especially the property of increasing the resistance to devitrification of the glass, is strong. The optical glass of the present invention contains Ca as an essential component and further contains at least one selected from the group consisting of Mg2+, Sr2+, and Ba2+. Since the above properties are strong, the content of Ca2+ is 1.0 to 8.0%' and the total content of R2+ is preferably 30.0 to 70%, more preferably 33.0 to 70.0%.

Ca2+ can be contained in the glass using, for example, Ca(P〇3)2, CaC〇3, CaF2 or the like as a raw material. Further, in order to particularly improve the resistance to devitrification of the optical glass of the present invention, the lower limit of the ratio of Ca 2+ 153081.doc 201226355 to the total amount (total content) of all alkaline earth metals (Ca 2+ / R 2+ ) is preferred. It is better to be 〇〇〇5, and the best is 〇〇1. Further, the upper limit is preferably 〇_9〇, more preferably 0.70, and most preferably 〇5〇. <Mg2+> The optical glass of the present invention sometimes contains Mg2+ as one of r2+ (counter soil). Mg2+ has the property of improving the resistance to devitrification of glass and reducing the degree of wear. Since the above properties are strong, the content of Mg2+ is preferably 1.0 to 20% by weight. Further, it is more preferably 3% or more, and still more preferably 5% or more. Further, it is more preferably 17.0% or less, and still more preferably 15.0% or less.

Mg2+ can be contained in the glass using, for example, MgO, MgF2, or the like as a raw material. <Sr2+> The optical glass of the present invention sometimes contains one of Sr2+ as an alkaline earth metal. Sr has the property of improving the resistance to devitrification of the glass and suppressing the decrease in the refractive index. Since the above properties are strong, the content of Sr2+ is preferably from 0% to 20.0%. Further, it is more preferably 10.0% or less, and still more preferably 5% by weight or less.

Sr2 can be contained in the glass using, for example, Sr(N〇3)2, SrF2 or the like as a raw material. <Ba2+> The optical glass of the present invention sometimes contains Ba2+ as one of R2+ (counter soil). Ba has a property of increasing the resistance to devitrification of the glass when it contains a specific amount. Moreover, it has the property of maintaining low dispersion and increasing the refractive index. Since the above properties are strong, the content of Ba2+ is preferably from 15.0% to 40.0%. Further, it is more preferably 16.0% or more, and still more preferably 17% by weight or more. Further, it is more preferably 38.0% or less, and still more preferably 37% or less. Ba2+ can be used, for example, as Ba(P〇3)2' BaC〇3, Ba(N〇3)2, BaF2, etc.

S I53081.doc .〇. 201226355 is contained in glass as raw material. &lt;Ln3+&gt; In the present invention, Ln3 + means at least one selected from the group consisting of Y3+, La3+, Gd3+, Yb3+, and Lu3+. Further, the total content of Ln3 + refers to the total content of the five kinds of ions (Y3++La3++(}d3++Yb3++Lu3+). The optical glass of the present invention is greater than 1.1% and 10 0 Ln3+ is contained in the total content of less than %. That is, the optical glass of the present invention contains at least one selected from the group consisting of γ3+, La3, Gd3+, Yb3+, and Lu3+, γ3+, La3, Gd3+, Yb3+, and Lu3+ The total content of each component is more than 丨1% and 10.0% or less. The optical glass of the present invention contains Ln3+ in a specific amount, so that the refractive index is higher and the properties of low dispersion are remarkable. Since the above properties are strong, Ln3+ The total content is preferably 15% or more, more preferably 2.0% or more, further preferably 9.0% or less, more preferably 8 or less and further preferably 7.0% or less. Further, relative to the total of Ln3 + The content of the content of Gd3 + is preferably greater than 〇·74. That is, the content ratio of each of the cation components of 'Y3+, La3+, Gd3+, bamboo 3+, and Lu3+ is preferably satisfied to satisfy Gd3+/(Y3++La3+). +Gd3++Yb3++Lu3+) &gt; 0.74. In addition, 'Gd3+/(Y3++La3++Gd3++Yb3++Lu3+) on the left is better than 0.80, and more preferably 〇 9 In addition, it is more preferably 1.00. The reason is that if the above relationship is satisfied, the devitrification resistance of the glass is further improved and the refractive index tends to increase. <Y3+> The optical glass of the present invention may contain Γ3+β γ3 + can increase the refractive index of glass, and it is not easy to reduce the abnormal dispersion of glass, and inhibit the increase of the shift point (Tg) of glass transition 15308l.doc •10· 201226355. If it contains γ3+ in excess, it will increase the glass. The nature of the devitrification resistance is improved. However, the stability is likely to be deteriorated, so that it is preferably 9% or less, more preferably 8.0% or less, and still more preferably 7% or less. Further, even if Υ3+ is not contained, In this respect, the glass of the present invention may be contained in the glass, and may be contained in the glass as a raw material, for example, γ2〇3, YF3, etc. &lt;La3+&gt; The optical glass of the present invention sometimes contains La3+eLa3+ has a property of increasing the refractive index of the glass and making the anomalous dispersion less difficult. Since the above properties are strong, the content of La3+ is preferably 1.5 Å/〇 or more, and more preferably 2.0% or more. More preferably 9% , Still more or less good as 8.0%, and further more preferably 7 further 〇0 / below.

La3+ can be contained in the glass using, for example, La2〇3, (4), or the like as a raw material. &lt;Gd3+&gt; The optical glass of the present invention preferably contains (10), more preferably contains more than 〇% and (%)% or less, and contains Gd3+eGd3+ to increase the refractive index of the glass and to make the anomalous dispersion difficult. Reduced, thereby improving the properties of devitrification resistance. Such a property sometimes has other components (e.g., γ3+, La3+, Yy+, and Lu3+), but the inventors have found that Gd3+ has a stronger tendency than other components. Since the above properties are strong, the content of Gd3+ is more preferably 15% or more and further preferably 2.0. /. the above. Further, it is preferably 9% or less, more preferably 8.0% or less, and still more preferably 7% by weight or less.

Gd3+ can be contained in the glass using, for example, GIO3, Gdh, or the like as a raw material. 153081.doc -11-201226355 &lt;Yb3+&gt; The optical glass of the present invention sometimes contains Yb3 and Yb3+, which has the property of increasing the refractive index of the glass, making it difficult to reduce the anomalous dispersion, and further improving the devitrification resistance. Since the above properties are strong, the content of Yb3+ is more preferably 5% or more, and still more preferably 2.0% or more. Further, it is preferably 9% or less, more preferably 8.0% or less, and still more preferably 7% or less.

Yb3 + can be contained in the glass using, for example, Yb2〇3 or the like as a raw material. &lt;Lu3+&gt; The optical glass of the present invention sometimes contains Lu3+&lt;jLu3+, which has a property of increasing the refractive index of the glass, making it difficult to reduce the anomalous dispersion, and further improving the devitrification resistance. Since the above properties are strong, the content of Lu3+ is more preferably 15% or more, and still more preferably 2.0% or more. Further, it is preferably 9% or less, more preferably 8.0% or less, and still more preferably 7% or less.

Lu3 can be contained in the glass using, for example, Lu2〇3 or the like as a raw material. &lt;Zn2+&gt; The optical glass of the present invention may contain Zn2+ as an optional component. ^2+ has the property of suppressing the degree of wear and increasing the refractive index. However, if Zn2+ is excessively contained, the stability of the glass is liable to deteriorate, so it is preferably 65% or less, more preferably 6.0%. The following is further preferably 5.5% or less. Further, even if π is not contained, the glass of the present invention can be obtained. Therefore, in this respect, Ζη2+ββΖ2+ can be contained, and, for example, Zn(P〇3)2, ZnQ, ZnF2 or the like can be used as a raw material and contained in the glass. 0 153081.doc -12- 201226355 &lt;Si4+&gt; The optical rupture of the present invention may also have S 丨 as an arbitrary component. When Si4+ contains a specific amount, it improves the resistance to devitrification of the glass n8 nr, increases the refractive index, and lowers the degree of wear to improve the processability. Since the above properties are enhanced, the content of Sl is preferably 10.0% or less, more preferably 8. G% or less, and even more preferably 5 G% or less.

Si4+ can be contained in the glass by using, for example, Si〇2, μc.r., K2SiF6 Na2SiF6, or the like as a raw material. '&lt;Β3+&gt; The optical glass of the present invention may contain Β3 + as an optional component. When β3+ is contained in a specific amount, the devitrification resistance of the glass is increased, the refractive index is increased, the degree of wear is lowered, the workability is improved, and the chemical durability is not easily deteriorated, and the formation of the texture on the glass is reduced. "Because of the above properties, the content of Β3+ is preferably 1% or less, more preferably 8.0°/D or less, and still more preferably 5 〇0/. Below. B3 + can be used, for example, H3B〇 3. Na^4.7, BP〇4, etc. are contained in the glass as a raw material. &lt;Li+&gt; The optical glass of the present invention may contain Lr as an optional component eLi+ to maintain the devitrification property when the glass is formed. Further, the properties of the glass transition point (Tg) are lowered. Since the above properties are strong, the content of Li+ is preferably 2% by mole or less, more preferably 15.0% or less, and still more preferably 100% or less.

Li + can be used as a raw material, for example, LhCO3, UNO3, LiF, etc.

S 153081.doc ^ 201226355 Inside the glass. &lt;Na+&gt; The optical glass of the present invention may further contain Na+ as an optional component. Na+ has a property of maintaining devitrification resistance at the time of glass formation and lowering a glass transition point (Tg). Since the above properties are strong, the content of Na+ is preferably 10% or less, more preferably 8.0% or less, still more preferably 5.0% or less.

Na+ can be contained in the glass using, for example, Na2C03, NaN03, NaF, Na2SiF6 or the like as a raw material. &lt;K+&gt; The optical glass of the present invention may contain Κ+ as an optional component. κ+ has resistance to devitrification upon glass formation and reduces the properties of the glass transition point (Tg). Since the above properties are strong, the content of K+ is preferably 1% or less, more preferably 8.0% or less, and even more preferably 5 〇0/. the following. K+ can be contained in the glass using, for example, K2c〇3, KN〇3, Kf, Khf2, K2SiF6 or the like as a raw material. &lt;Rn+&gt; In the optical glass of the present invention, the total content of Rn + (Rn+ is at least one selected from the group consisting of u+, Na+ & K+) is preferably 20.0% or less, more preferably It is 〖5.0% or less, and more preferably 1% or less. &lt;Nb5+&gt; The optical glass of the present invention may further contain Nb5+ as an optional component. Nb5+ has the property of increasing the refractive index of the glass, improving the chemical durability, suppressing the decrease in the Abbe number, and suppressing the increase in the melting temperature. 15308 丨.doc 201226355 Since the above properties are strong, the content of Nb^ is preferably less than 1%, more preferably 8.0% or less, and still more preferably 5.0% or less.

Nb can be contained in the glass using, for example, Nt&gt;2〇5 or the like as a raw material. &lt;Ti4+&gt; The optical glass of the present invention may contain Ti4+ as an optional component. Dingshao 4+ has the property of increasing the refractive index of the glass and reducing the coloration. Since the above properties are strong, the content of Ti 目 is preferably 1 〇 〇 % or less, more preferably 8 _0 % or less, and still more preferably 5 or less. Τι4 can be contained in the glass using, for example, Ti〇2 or the like as a raw material. &lt;Zr4+&gt; The optical glass of the present invention may contain Zr4+ as an optional component. &amp; 4+ has the property of improving the mechanical strength of glass by increasing the glass's refractive index. Since the above properties are strong, the content of Zr4+ is preferably 3,000 or less, more preferably 8.0% or less, still more preferably 5 or less.

Zr4+ can be contained in the glass by using, for example, Zr〇2, ZrF4, or the like as a raw material. &lt;Ta5+&gt; The optical glass of the present invention may contain Ta5+ as an optional component. η" has a property of improving the refractive index of the glass. Since the above properties are strong, the content of Ta5+ is preferably at most 1% by weight, more preferably 8.0% by weight or less, still more preferably 5% by weight or less.

Ta5+ can be contained in the glass using, for example, Ta2〇5 or the like as a raw material. &lt;W6+&gt; The optical glass of the present invention may contain W6 + as an optional component. w" has the refractive index of the glass, and thus inhibits the degradation of the Abbe number. 201226355 Because of the above properties, the content of W6+ is preferably less than 1%, more preferably less than 8.0%, and thus more preferably It is 5 〇% or less. It can be contained in the glass using, for example, w〇3 or the like. <Ge4+> The optical glass of the present invention may further contain Ge4+ as an optional component ^&amp;4+ having an improved refractive index of glass Further, since the above properties are remarkable, the content of Ge4+ is preferably 10,000% or less, more preferably 8.0% or less, still more preferably 5% by weight or less.

Ge4+ can be contained in the glass using, for example, Ge〇2 or the like as a raw material. &lt;Bi3+&gt; The optical glass of the present invention may contain Bi3 + as an optional component. Bi3+ has the refractive index of the glass, which reduces the nature of the glass transition point. Since the above properties are strong, the content of Biw is preferably 10,000% or less, more preferably 8.0% or less, and still more preferably 5% by weight or less.

Bi3+ can be contained in the glass using, for example, 2〇3 or the like as a raw material. &lt;Te4+&gt; The optical glass of the present invention may contain Te4+ as an optional component. Ding+ has the property of increasing the refractive index of the glass, preventing devitrification, and suppressing coloration. Since the above properties are strong, the content of Te4+ is preferably 15% or less, more preferably 10.0%. Hereinafter, it is more preferably 8 % by weight or less, and still more preferably 5 ? ° / 〇 or less.

Te4+ can be contained in the glass using, for example, Te〇2 or the like as a raw material. [About anionic component] &lt;F&gt; 15308l.doc 201226355 The optical glass of the present invention contains F and F· and has the property of improving the abnormal dispersion property of the glass and the Abbe number, and further preventing the glass from devitrifying. Since the above properties are strong, the content of F- is represented by the percentage of anions, preferably from 15.0 to 40.0%. Further, it is more preferably 18.0% or more, and still more preferably 20.0% or more. Further, it is more preferably 35.0% or less, and still more preferably 33% or less. F· can be contained in the glass using, for example, a fluoride of various cationic components such as AIF3, MgF2, or BaF2 as a raw material. &lt;〇2&gt; The optical glass of the present invention contains 02·. 〇2· has the property of suppressing the degree of wear of the glass and is a component necessary for forming a mesh structure. The total content of 〇2_ and the content of F- is expressed as a percentage of anion, preferably 98.0% or more, more preferably 99·0°/. More preferably, the above is ι00%. Because of the availability of stable glass. 〇2_ can be used as a raw material of various cationic components such as oxides such as Al2〇3, MgO, and BaO, such as oxides such as Al(PO)3, Mg(PO)2, and Ba(PO)2. It is contained in the glass. In the optical glass of the present invention, other components may be added as needed within the range which does not impair the characteristics of the glass of the present invention. [Regarding ingredients that should not be contained] Next, the components which should not be contained in the optical glass of the present invention and the components which are not suitable are described. In addition to Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, cations of transition metals such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo have singly, individually or in combination, respectively. When there is a small amount of glass, the glass will also

S 153081.doc -17- 201226355 color, so as to absorb the specific wavelength in the visible light region, so it is not particularly suitable for optical glass using the wavelength of the visible light region. Further, cations of Pb, Th, Cd, T1, Os, Be, and Se have been in a controlled use as harmful chemicals in recent years, and are required not only for the production steps of the glass but also for the processing steps and even after the product is processed. Take environmental protection measures. Therefore, in the case of paying attention to the influence of the environment, it is preferable to contain substantially no such substance except for inevitable mixing, and the optical glass substantially does not contain a substance which pollutes the environment. Therefore, even if special environmental protection measures are not taken, the optical glass β can be manufactured, processed, and discarded. Although sb can be effectively used as a defoaming agent, in recent years, sb has been adversely affected by the environment. However, there is a dichroism that is not contained in the optical glass, and in this respect, 'Sb is not preferable. In summary, the preferred aspect of the optical glass of the present invention is disclosed. The optical glass of the present invention is preferably as follows: as a cationic component, expressed as a percentage of cations: P5+ : 25 to 50 〇 / 〇 Al3 + : 5 to 15%

Ca2+ : 1 ~ 8% R2+ : 30~70%

Gd3+: greater than 0〇/〇 and 1〇, 〇% or less Ln3+: greater than 1.1% and 1〇.〇〇/0 or less; as an anionic component, expressed as a percentage of anion, containing: 15308l.doc 201226355 F' : 15~40 % ; refractive index (nd) g 1·55, Abbe number (vd) g 55. Further, it is more preferable that the content of each of the cation components of Y3+, La3+, Gd3+, Yb3+, and Lu3+ satisfy the relationship of Gd3+/(Y3++La3++Gd3++Yb3++Lu3+)&gt;0.74. [Production Method] The method for producing the optical glass of the present invention is not particularly limited. For example, it can be produced by uniformly mixing the above-mentioned raw materials in such a manner that the respective components are within a specific content ratio, and putting the prepared mixture into quartz crucible or alumina crucible or platinum crucible for coarse melting. , placed in a platinum crucible, a platinum alloy crucible or a crucible in a temperature range of 900 to 1200 ° C for 2 to 1 hour. After being homogenized by stirring and defoaming treatment, the temperature is lowered to below 850 C, followed by Fine-grained to remove the texture and poured into the mold to slow down. [Physical Properties] The optical glass of the present invention is characterized by a local dispersion ratio (eg, F). Therefore, it is easy to obtain an optical glass which can correct chromatic aberration with high precision. The partial dispersion ratio (0g, F) is preferably 0.535 or more, more preferably 〇 538 or more, still more preferably 0.540 or more, and still more preferably 〇 542 or more. Further, the partial dispersion ratio (eg, F) means a value measured in accordance with the Japanese Optical Glass Industry Association standard JOGIS01-2003. Further, the term "local dispersion ratio" as used in the present invention means a local dispersion ratio in a short wavelength region. In the optical glass of the present invention, the anomalous dispersion property (, F) is high. Therefore, % 153081.doc •19· 201226355 It is easy to obtain a lens that can correct chromatic aberration with high precision. The anomalous dispersion (structure, F) is preferably at least the above, more preferably (four) 8 or more, still more preferably 0.010 or more, still more preferably 〇〇11 or more, still more preferably 0.012 or more, and still more preferably 〇〇13. the above. Here, the local dispersion ratio (eg, F) and the anomalous dispersion (Δ", F) will be described, and then the characteristics of the physical properties of the optical glass of the present invention will be described in more detail. First, the local dispersion ratio will be described ( Eg, f) The local dispersion ratio (eg, f) is the ratio of the difference in refractive index between two wavelength regions in the wavelength dependence of the refractive index, and can be expressed by the following formula (1). 9g » F =(ng-nF)/(nF-nc) (1) where 'ng refers to the refractive index of the g-line (435.83 nm), and ηρ refers to the refractive index of the ρ line (486.13 nm)' nc Refers to the refractive index of the c-line (656.27 nm) and 'when the relationship between the local dispersion ratio (6g 'F) and the Abbe number (Vd) is plotted on the XY chart, in the case of general optical glass , roughly drawn on a line called a regular line. The so-called regular line refers to the 色 γ chart with the local dispersion ratio (0g ' F) as the vertical axis and the Abbe number (vd) as the horizontal axis ( Orthogonal coordinates) 'Through the local dispersion ratio of NSL7 and PBM2 and the Abbe number plot, the two points are connected to the upper right line (refer to Figure 1}. The base glass (n〇rmal glass) will vary for each optical glass manufacturer', but each company is defined by roughly equal slopes and intercepts (NSL7 and PBM2 are optical glass manufactured by Ohara Co., Ltd.) The Abbe's number (vd) of NSL7 is 60.5', the local dispersion ratio (eg, F) is 0.5436, the Abbe's number (vd) of PBM2 is 3 6.3, and the local dispersion ratio (eg, F) is 0.5828). 153081.doc - 20· 201226355 Relative to the local dispersion ratio (eg, f) as described above, the so-called anomalous dispersion (Δeg, f) ' indicates the local dispersion ratio, F) and the Abbe number (vd) from the regular line The degree of separation along the longitudinal axis. The optical element made of glass with a large anomalous dispersion (Δeg ' f) has a wavelength range near blue, which corrects the chromatic aberration caused by other lenses. In the middle-low dispersion region (the area where the Abbe number is about 55 or more), the larger the Abbe number (vd), the greater the tendency of the anomalous dispersion (^eg, F). The wear degree is 510 or less, and the abnormal dispersion is maintained at a high degree. The present inventors have actively studied 'optical glass having a higher anomalous dispersion (Aeg, F) relative to the Abbe number (vd) than the previous one has been successfully developed. For example, if it is disclosed later as an example In the case of the optical glass of the preferred aspect, when the Abbe number (vd) is about 66 to 68, the local dispersion ratio (0g, F) is 0.545 or more, and the anomalous dispersion (A0g ρ) is also 〇.光学13 or more optical glass. The values of such partial dispersion ratio (0g, F) and anomalous dispersion (?9g, F) are clearly higher than those of the former with the same degree of Abbe number (vd). The optical glass of the present invention has a high refractive index (nd) and low dispersibility (high Abbe number). The refractive index (nd) is 1.55 or more', preferably ι·56 or more, and more preferably 1.57 or more. The Abbe number (vd) is 55 or more, preferably 5 or more, more preferably 60 or more, and still more preferably 66 or more. Since the optical glass of the present invention has the refractive index (nd) and the Abbe number (vd) as described above, the degree of freedom in optical design is increased, and even if the element type 153081.doc 201226355 is thinned, it is possible to obtain a larger size. The amount of light refraction. Further, the refractive index (nd) and the Abbe number (vd) refer to values measured according to the Japanese Optical Glass Industrial Standard JOGIS01-2003. The optical glass of the present invention has a low degree of wear. Therefore, it is possible to reduce the wear or damage of the optical glass beyond the required abrasion, making it easy to handle the polishing process of the optical glass, thereby facilitating the grinding process. The degree of wear is preferably 510 or less, more preferably 500 or less, still more preferably 490 or less, and still more preferably 480 or less, still more preferably 47 Å or less, still more preferably 460 or less, and still more preferably 450 or less. Further, it is more preferably 44 Å or less, still more preferably 430 or less, and still more preferably 42 Å or less. On the other hand, if the degree of wear is too low, there is a tendency that the polishing process is difficult. Therefore, the degree of wear is preferably 80 or more, more preferably 1 Torr or more, and still more preferably 120 or more. Further, the term "wearing degree" means a value measured in accordance with "JOGIS 10-1994 Method for Measuring the Degree of Wear of Optical Glass". [Preform and Optical Element] The optical glass of the present invention is suitable for various optical elements and optical designs, and it is particularly preferable to form a preform from the optical glass of the present invention, and the preform is produced by a method such as grinding or precision press forming. Optical components such as lenses, cymbals, and flat mirrors. Thereby, when used for an optical device such as a camera or a projector that transmits visible light to an optical element, high-definition and high-precision imaging characteristics can be realized, and the optical system in such an optical device can be miniaturized. Here, the method of manufacturing the prefabricated material is not particularly limited, and the forming method described in, for example, the glass 153081.doc • 22·201226355 described in Japanese Patent Laid-Open No. Hei No. Hei 8- 319-124, or Japanese Patent Laid-Open No. Hei 8-73229 In the method for producing an optical glass and the method for producing the optical glass, the method for directly producing a preform from molten glass, or a method for cold working such as grinding and polishing a strip material formed of optical glass . [Examples] Table 1 shows the composition, refractive index (nd), Abbe number (vd), local dispersion ratio (3) g, F), and anomalous dispersion (Δθ) of the glass of Examples 1 to 5 which are optical glasses of the present invention. § 'F), degree of wear and specific gravity (g/cm3). The optical glasses of Examples 1 to 5 of the present invention are each selected from high-purity raw materials used in ordinary fluorophosphate glasses such as oxides, carbonates, nitrates, fluorides, and phosphorous oxides. The raw materials of the components were weighed and uniformly mixed so as to have a composition ratio of the respective examples shown in Table 1, and then charged into a platinum crucible, and the melting difficulty of the glass composition was in the electric furnace at 900 to 1200. (The temperature range is melted for 2 to 1 hour, and after defoaming by homogenization by stirring, the temperature is lowered to 85 〇 &lt;&gt; or less, and then cast into a mold to be slowly cooled to prepare glass. The refractive index (nd), the Abbe number (vd), and the partial dispersion ratio (eg, F) of the optical glasses of Examples 1 to 5 were measured according to the Japan Optical Glass Industry Association standard JOGIS01-2003. As the glass used in the measurement, the annealing condition was set to a slow cooling rate of 2 Γ (: / hr, which was processed by a slow cooling furnace, and was based on the measured Abbe number (vd). The difference between the value of the local dispersion ratio (0g, F) on the normal line of i and the measured value of the local dispersion ratio (0g, F) is used to obtain the anomalous dispersion (Δ", F). "jOGIS1〇_1994 Optical glass wear degree 153081.doc •23· 201226355 Determination method". That is, a sample of a glass square plate of 30 χ 3 Ο χ 10 mm is placed at a level Cast iron flat plate (250 ηηηιφ) rotated 60 times per minute, center distance 80 mm In a fixed position, a load of 9.8 N (1 kgf) is applied vertically on one side, and 10 g of #800 (average particle size 20 μm) of abrasive material is added to 20 mL of water at a constant rate for 5 minutes (oxidized 铭 Α grinding) The polishing liquid was rubbed, and the mass of the sample before and after the polishing was measured to determine the wear quality. In the same manner, the wear quality of the standard sample specified by the Japan Optical Glass Industry Association was determined and calculated according to the following formula. According to the degree of wear = {(wear quality / specific gravity of the sample) / (wear quality / specific gravity of the standard sample)} χ 1 〇〇, the specific gravity is expressed relative to the value of pure water at +4 ° C, by It was determined by the Archimedes method. [Table 1] Example 1 2 3 4 5 Both m Ρ5+ 38.96% 38.96% 38.96% 38.96% 38.77% Al3+ 12.01% 12.01% 10.22% 12.01% 11.95% Mg2+ 10.20% 10.20% 10.20 % 5.41% 10.15% Ca2+ 2.39% 4.79% 1.80% 4.79% 2.39% Ba2+ 34.04% 31.65% 36.44% 36.44% 33.81% Gd3+ 2.40% 2.40% 2.40% 2.40% 2.94% Total cations 100.0% 100.0% 100.0% 100.0% 100.0% Ο2* 75.52% 75.52% 75.53% 73.98% 74.0% F_ 24.48% 24.48% 24.47% 26.02% 26 .0% anion total 100.0% 100.0% 100.0% 100.0% 100.0% r2+ 46.6% 46.6% 48.4% 46.6% 46.4% ιϋ nd 1.59754 1.59595 1.59847 1.59550 1.59754 vd 67.8 67.3 66.9 67.4 67.8 0g ' F 0.546 0.550 0.548 0.545 0.546 △0g, F 0.014 0.017 0.015 0.013 0.014 Wear degree 416 416 508 502 416 Specific gravity 4.17 4.11 4.22 4.21 4.17 153081.doc • 24-201226355 As shown in Table 1, the optical glass of the embodiment of the present invention has a refractive index (nd) of 1.55 or more. The Abbe number is more than 55. Further, specifically, in all of the examples, the refractive index (nd) was 丨59 or more, and the Abbe number (vd) was 66 or more. Further, the partial dispersion ratio (3)g, F) is 〇.545 or more, and the abnormal dispersion property (Mg, F) is 0.013 or more. Such values of partial dispersion ratio (eg, F) and anomalous dispersion (ΔΘ§, F) are significantly higher values than those of the former with the same degree of Abbe number (vd). Further, the wear of all the examples was 510 or less. In addition, the specific gravity is 4.22 or less. Further, the optical glass of the embodiment of the present invention is used to form a preform for polishing, followed by grinding and polishing to form a lens and a crucible. Further, the optical glass of the embodiment of the present invention is used to form a preform for precision press molding, and the preform for precision press molding is subjected to precision press forming processing to be processed into a shape of a lens and a crucible. All cases can be processed into a variety of lenses and shapes. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a regular line indicated by an orthogonal coordinate with a local dispersion ratio (eg, F) as a vertical axis and an Abbe number (vd) as a horizontal axis. s 153081.doc -25-

Claims (1)

201226355 VII. Patent application scope: 1. One or three kinds of optical glass, wherein as a cationic component, it is composed of p5+, Al3+, Ca2+, Ln3+ (Ln3+ is selected from γ3+, La3+, Gd3+, γΐ)3 + and Lu3 + At least one of the group and at least one of the groups consisting of 峋2+, V+, and 仏2+; the total content of Ln3+ is expressed as a percentage of cations greater than i ι % and less than 1 〇.〇%; The anion component contains F·; a refractive index (nd) g of 1.55 and an Abbe number (vd) of g55. 2. The optical glass of the request, wherein the cationic component is expressed as a percentage of the cation, and contains: p5+ : 25-50% Al3+ : 5 to 15% Ca2+ : 1 to 8% R2+ : 30 to 70% (R2+ means Ca2+ +Mg2++Sr2++Ba2+); Gd3+: greater than 〇% and 1〇.0. /0 or less; as an anionic component, expressed as a percentage of an anion, containing: F· : 15 to 40%. 3. The optical glass of claim 1 or 2, wherein the content ratio of each of the cation components of Y3+, U3+'0 (13+, Yb3+, and Lu satisfies the following relationship: Gd3+/(Y3++La3++Gd3++Yb3 ++Lu3+)&gt;〇74. 4. If the optical glass of item 丨 or 2 is requested, the total content rate is not 33~70% by the percentage of cations. 1530Bl.doc 1 ^ 201226355 5. As requested in item 1 or Optical glass of 2, which does not contain St. 6. The optical glass of claim 1 or 2, which does not contain γ. 7. The optical glass of claim 1 or 2, wherein the degree of wear is 51 〇 or less. An optical element comprising the optical glass according to any one of claims 1 to 7. A preform for grinding and/or precision press forming, comprising the optical according to any one of claims 1 to 7. Glass 10. An optical component that is precisely pressed as a preform of claim 9 0 153081.doc -2-