Optical glass used for precision mould pressing, glass prefab, optical element and optical instrument

A technology of glass prefabrication and optical glass, which is applied in the direction of optical components, glass pressing, glass manufacturing equipment, etc. It can solve the problems of high glass transition temperature and unsuitability for molding, so as to improve the quality level, improve the uniformity and The effect of uniform, low-dispersion performance

Active Publication Date: 2014-03-12
CDGM OPTICAL GLASS
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  • Application Information

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Problems solved by technology

[0005] Japanese Patent Application Laid-Open No. 2002-128539 discloses a high-refraction, low-dispersion optical glass. Since the glass does not contain or only contains a small amoun

Method used

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  • Optical glass used for precision mould pressing, glass prefab, optical element and optical instrument
  • Optical glass used for precision mould pressing, glass prefab, optical element and optical instrument
  • Optical glass used for precision mould pressing, glass prefab, optical element and optical instrument

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Example Embodiment

[0062] Example

[0063] Hereinafter, embodiments of the precision molded optical glass of the present invention will be described. It should be emphasized that these embodiments do not limit the protection scope of the present invention.

[0064] The optical glasses shown in Table 1 to Table 3 (Examples 1 to 30) were prepared by weighing and mixing common raw materials for optical glasses according to the ratios of the respective examples shown in Tables 1 to 3, such as oxides, hydrogen Oxides, carbonates, nitrates and fluorides, the mixed raw materials are placed in a platinum crucible and melted at a temperature of 1100-1300°C for 2-5 hours, and after clarification and stirring for homogenization, the The melt is cast in the mold and annealed.

[0065] The composition and refractive index (nd), Abbe number (vd), glass transition temperature (Tg), density (ρ), water resistance stability (D) of the embodiments of the present invention (1-30) W ) And the degree of shading (λ 80 / λ 5...

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Abstract

The invention provides high-refraction low-dispersion optical glass used for precision mould pressing, a glass prefab formed by the optical glass, an optical element formed by the optical glass, and an optical instrument formed by the optical glass. The optical glass comprises following components by weight: 1-10% of SiO2, 10-25% of B2O3, 15-35% of La2O3, 10-35% of Gd2O3, 1-20% of ZnO, and at least one selected from LaF3, GdF3 and YF3. The refractive index of the optical glass is 1.75-1.82 and the Abbe number of the optical glass is 45-52. F<-> is introduced by utilization of a manner of combining with rare earth elements, and therefore the low dispersion performances required of the optical glass can be achieved and the uniformity and consistency of the glass can be increased. By a reasonable design of the combination ratio of the Li2O, the ZnO and the F, stability of the glass can be improved effectively, the quality level of the glass can be increased and the transistion temperature of the glass can be reduced, thus facilitating compression molding.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass for precision molding with a refractive index of 1.75-1.82 and an Abbe number of 45-52, as well as preforms, optical elements and optical instruments made of the optical glass. Background technique [0002] In recent years, all kinds of optoelectronic products are increasingly pursuing miniaturization, high performance and multi-functionality, which requires optical components such as lenses used in optical systems to also be miniaturized and lightweight. Since the use of aspheric elements can eliminate spherical aberration and reduce the number of optical elements, the use of aspheric elements has become the mainstream in optical design. [0003] In aspheric molding, the commonly used method is precision molding. The so-called precision compression molding is to mold a glass preform with a high-precision mold with a predetermined product shape under a certain temperature and...

Claims

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Application Information

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IPC IPC(8): C03C3/068C03B11/08G02B1/00
CPCY02P40/57
Inventor 匡波
Owner CDGM OPTICAL GLASS
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