Negative anomalous dispersion optical glass

A technology of dispersion optics and optical glass, applied in the field of optical glass, can solve problems such as poor acid resistance, achieve large negative anomalous dispersion, eliminate chromatic aberration and secondary spectrum, and low internal transmittance ratio

Inactive Publication Date: 2019-02-26
CHENGDU UNITE OPTOELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some introduced a large amount of Li 2 O, Na 2 O component, there are defects such as poor acid resistance

Method used

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  • Negative anomalous dispersion optical glass
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  • Negative anomalous dispersion optical glass

Examples

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Embodiment

[0116] Tables 2-4 present preferred examples of optical glasses with negative anomalous dispersion and comparative examples for comparison. The purpose of giving the following examples is only for illustration, and the present invention is not limited to the following examples.

[0117] Tables 2 to 4 show the glass composition of Examples No. 1 to No. 14 of the optical glass of the present invention and the compositions and index properties of Comparative Examples No. a to No. f of glasses having relatively the same properties as the glass of the present invention. The indicators in each of the following examples and comparative examples are determined by: -4.0 / h annealing rate and cooling the obtained optical glass. The test properties include: refractive index (nd), Abbe number (vd), relative partial dispersion (PgF), anomalous dispersion (△PgF), internal transparency ratio (τ80), acid resistance (DA) transition temperature (Tg), test The results are given in Tables 2-4.

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Abstract

The invention relates to an optical glass having negative anomalous dispersion. The optical glass has optical constants of a refractive index (nd) being above 1.70 and Abbe number (vd) being in a range of 29-35, and has large negative anomalous dispersion, low internal transmittance (10mm/tau80%) and excellent acid resistance (DA). The optical glass does not contain harmful components such as PbOand expensive components like GeO2 and Ta2O5. The above-mentioned negative anomalous dispersion optical glass is characterized in that the optical glass contains (mol%) the following components as necessary components: 10-40% of SiO2 and 10-30% of B2O3, wherein SiO2/B2O3 can be less than or equal to 3, 5-20% of Nb2O5, 1-10 % of ZrO2, and further contains 2-15% of BaO, 2-20% of MgO, 1-10% of Li2O,and 1-12% of Na2O.

Description

technical field [0001] The present invention relates to an optical glass having a large negative anomalous dispersion value, an optical constant whose refractive index (nd) is more than 1.70 and Abbe's number (vd) is more than 29 but less than 35. And does not contain harmful oxide PbO components, and expensive GeO 2 、 Ta 2 o 5 and other components. More specifically, in addition to optical constants, it has a low internal transparency ratio and excellent acid resistance. Background technique [0002] In the design of the optical system, for ordinary optical glass that does not have anomalous dispersion characteristics, a combination of two optical lenses with different Abbe numbers is usually used to eliminate the chromatic aberration of the two colors of light. However, there is still a difference in the second spectral region Residual chromatic aberration, the secondary spectrum. Especially in the design of high-end optical systems such as SLR cameras, video cameras,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/064C03C3/066C03C4/20
CPCC03C3/064C03C3/066C03C4/20
Inventor 王自力黄俊
Owner CHENGDU UNITE OPTOELECTRONICS TECH CO LTD
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