Phosphorus crown optical glass with medium refractive index and high Abbe number

Abstract

The invention is phosphorus crown optical glass with a medium refractive index and a high Abbe number. The invention belongs to the technical field of optical glass. The invention mainly solves the problems of poor heat stability and increased production difficulties of current phosphate system glass. The invention is mainly characterized in that the glass comprises, by weight: 60-83% of Ba(PO3)2; 3-15% of Al(PO3)3; 0.5-5% of Al2O3; 3-10% of B2O3; 2-10% of La2O3; 0-5% of Gd2O3; 0-5% of Y2O3; 2.5-10% of Sigma (La2O3+Y2O3+Gd2O3); 0-2% of ZrO2; 3-10% of BaO; 0-10% of CaO; 0-10% of SrO; 3-10% of Sigma (CaO+SrO+BaO); 0-0.5% of Sb2O3. The invention has a refractive index of 1.59-1.62, an Abbe number of 63-69, a transition temperature of less than 610 DEG C, a specific gravity of 3.50-3.80 g / cm3, and a glass Dw of grade 1 determined according to 'GB / T17129-1997 determination method of optical glass chemical stability', also has the characteristics of low tinting strength, good stability, excellent process performance, and suitability for batch production, and is mainly used for removing chromatic aberration in lens groups so as to reach the purpose of chromatic aberration correction.

Description

technical field [0001] The invention belongs to the technical field of optical glass, in particular to a phosphorus crown optical glass with medium refractive index and high Abbe number. Its refractive index (nd) is between 1.59 and 1.62 and Abbe's number (υ d ) in the range of 63 to 69, suitable for optical glass used in digital products or projectors. Background technique [0002] With the development of the optoelectronic industry, digital cameras, video cameras and camera phones are constantly developing towards better image quality and higher definition, which has a direct impact on image definition and image quality improvement imaging system-lens products. higher requirements. In order to meet the development trend of lens products, on the one hand, lens products are developed from ordinary lenses to aspheric lenses, reducing aberrations, pursuing high image quality, and realizing miniaturized designs; on the other hand, through special optical design technology, us...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (CN 100371277) discloses a kind of refractive index (nd) in 1.52~1.72 and Abbe number (υd) in The glass between 57~70 belongs to the phosphate system, but it contains the total of Li2O, Na2O and K2O The amount of ZnO exceeding 3% mol causes the glass to have a large expansion coefficient, the thermal stability of the glass is poor, and the composition contains more than 0 and less than 15% mol of ZnO, which increases the difficulty of the production of this glass

[0004] Chinese patent (CN 101360691A) discloses a kind of refractive index (nd) between 1.50~1.65 and Abbe number (υd ) The glass at 50~65 belongs to the phosphate system, but its components contain ZnO, the glass lacks thermal stability and is prone to devitrification

[0005] Chinese patent application (publication number CN 1304315C) discloses a kind of refractive index (nd) between 1.54~1.65 and A multiple (υd sub>) glass between 57~69 belongs to the phosphate system, but the glass composition contains 3~14wt% ZnO, the glass lacks thermal stability and is prone to devitrification

[0006] Chinese patent application (publication number CN 1313405C) discloses a refractive index (nd) between 1.57~1.67 and a multiple (υd) glass between 55~65, but the glass composition is B2O3-SiO2-R 2O-RO-R2O3 is a glass composition system, and the hardness of the glass is relatively high, which is not conducive to processing

[0007] Chinese patent application (publication numbers CN100374386C and CN101134640A) discloses a refractive index (nd) between 1.52~1.70 and a multiple (υd) between 42 and 70, belongs to the phosphate system, but the glass composition is Li2O, Na2O and K2O is 10~40mol% and the ZnO content is 5~40mol%, which causes the glass to have a large expansion coefficient and the thermal stability of the glass becomes poor

[0008] Chinese patent application (publication number CN1754851A) discloses a phosphate glass with a multiple (υd) exceeding 59 but less than 70 , the range of the refractive index is not specified, and its components contain Li2O, which is easy to cause a large expansion coefficient, at 0~20wt% and excluding 0 and refractory MgO at 0~25wt% And does not include 0, resulting in poor thermal stability of the glass, and difficult to produce

[0009] Chinese patent application (publication number CN1303024C) discloses a kind of refractive index (nd) between 1.60~1.68 and A multiple (υd) The glass between 40~65 belongs to the phosphate system, but the content of F in the glass composition is 15~35mol%, and the volatilization of F in the glass production process affects the environment

[0010] Chinese patent application (publication number CN101172774A) discloses a kind of refractive index (nd) between 1.60~1.64 and A multiple (υd) The glass between 56~64 belongs to the phosphate system, and its glass composition contains 3~10wt% ZnO. The glass lacks thermal stability and is prone to devitrification