Optical glass

A kind of optical glass and glass technology, which is applied in the field of glass prefabricated parts and optical components, can solve the problems such as the drop or sudden decrease of the transmitted light amount of the optical system, the generation of texture, the increase of the change of the glass refractive index, etc., and achieve the effect of excellent transmittance

Inactive Publication Date: 2017-03-01
CDGM OPTICAL GLASS
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Problems solved by technology

At the same time, the optical elements of optical systems such as camera or projection have high requirements on the transmittance of optical glass. If the amount of transmitted light through the lens formed by high-refraction and low-dispersion optical glass is insufficient, the amount of transmitted light of the optical system will be greatly red

Method used

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[0083] Example

[0084] The following examples are used to explain the present invention, but the present invention should not be limited to these examples.

[0085] [Optical Glass Example]

[0086] First, in order to obtain glass No. 1-35 with the composition shown in Table 1 to Table 4, carbonate, nitrate, sulfate, hydroxide, oxide, boric acid, etc. are used as raw materials, and the optical glass composition Corresponding raw materials are weighed in proportion and mixed thoroughly to become a blended raw material. Put the blended raw material into a platinum crucible, heat to 1380-1450°C, and clarify and stir for 3 to 5 hours before becoming a uniform melt. Then, the molten glass was poured into a preheated mold and kept at 650 to 700°C for 2 to 4 hours, and then slowly cooled to obtain each optical glass of glass No. 1-35.

[0087] In addition, the characteristics of each glass were measured by the method shown below, and the measurement results are shown in Tables 1 to 4.

[008...

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Abstract

The invention provides optical glass with high refraction power and low chromatic dispersion. The optical glass comprises, by weight, 1 to 30% of B2O3, 0.1 to 15% of SiO2, 25 to 52% of La2O3, 1 to 30% of Gd2O3, more than 0 and no more than 12% of Y2O3, 1 to 10% of ZrO2, 1 to 30% of Nb2O5, 0 to 10% of Ta2O5, 0 to 5% of TiO2, 0 to 5% of WO3, 0 to 10% of ZnO, 0 to 10% of Al2O3 and 0 to 10% of GeO2. The glass does not contain PbO and F and has a refractive index in a range of 1.86 to 1.92 and an Abbe number in a range of 37 to 42. The environment-friendly optical glass with excellent transmittance, high refraction power and low chromatic dispersion is obtained by introducing a proper amount of rare earth oxide components with high refraction power and low chromatic dispersion.

Description

technical field [0001] The invention relates to an optical glass with high refractive index and low dispersion characteristics, as well as a glass preform and an optical element formed from the optical glass. Background technique [0002] Combining lenses made of high refractive index and low dispersion optical glass with lenses made of high refractive index and high dispersion optical glass can correct chromatic aberration and miniaturize the optical system, especially when the refractive index nd is 1.86-1.92 and the Abbe number νd is 36-42 environmental protection optical glass with high refractive index and low dispersion, the market demand is increasing day by day. [0003] Japanese Patent Application No. 2001-348244, Patent Application No. 2007-269584, and Chinese CN101386469A all disclose this type of high-refraction and low-dispersion optical glass. In the examples of the description, optical glass components with a refractive index of 1.86 or more contain a large am...

Claims

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Application Information

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IPC IPC(8): C03C3/068C03C4/00
Inventor 孙伟
Owner CDGM OPTICAL GLASS
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