Far-infrared short-wave cut-off film for mould pressing of aspheric lens

An aspheric lens and far-infrared technology, applied in optics, instruments, optical components, etc., can solve the problems of easy film release, low melting point, and difficulty in realizing a large far-infrared short-wave cut-off film, and achieve high cut-off rate and high transmission rate effect

CN111474617AInactive Publication Date: 2020-07-31莱特巴斯光学仪器(镇江)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-07-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a far-infrared short-wave cut-off film for mould pressing of an aspheric lens. The far-infrared short-wave cut-off film comprises a first optical surface and a second opticalsurface, wherein the first optical surface comprises, by weight, 1-3 parts of yttrium oxide, 65-75 parts of ytterbium fluoride, 5-15 parts of zinc sulfide and 15-25 parts of germanium; and the secondoptical surface comprises, by weight, 1-3 parts of yttrium oxide, 50-60 parts of ytterbium fluoride, 30-40 parts of zinc sulfide and 10-20 parts of germanium. The high transmittance (7.5-14 [mu]m) andthe high cut-off rate (1-6.5 [mu]m) are achieved.
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Description

technical field

[0001] The invention relates to the field of lens technology, in particular to a far-infrared short-wave cut-off film for molding an aspherical lens. Background technique

[0002] Infrared lenses are mainly used in surveillance lenses, temperature measurement products, night vision products and other products and are mainly used in the far-infrared wavelength range, and the surface of the lens is coated for better performance. Generally, the main processing methods of infrared lenses are cold processing and molding. For smaller lenses, it is more advantageous to use chalcogenide glass for molding. Usually, an optical anti-reflection film is coated on the surface of the lens to meet the requirements of use. However, some products need to cut off wavelengths other than the used wavelength due to higher or special requirements. For lenses with wavelengths in the far infrared, thicker coatings are required to meet this requirement.

[0003] However, compared w...

Examples

Embodiment 1

[0053] A far-infrared short-wave cut-off film for molding an aspheric lens, comprising a first optical surface and a second optical surface;

[0054] The first optical surface includes the following components by weight:

[0055] 1 part of yttrium oxide;

[0056] 65 parts of ytterbium fluoride;

[0057] 15 parts of zinc sulfide;

[0058] Germanium 25 parts;

[0059] The second optical surface includes the following components by weight:

[0060] 3 parts of yttrium oxide;

[0061] 60 parts of ytterbium fluoride;

[0062] 30 parts of zinc sulfide;

[0063] Germanium 10 parts.

[0064] A production process for a far-infrared short-wave cut-off film for a molded aspheric lens, comprising the following steps: S1, coating the first optical surface and the second optical surface of the lens with different properties and different thicknesses of the film layers, Use an infrared optical coating machine to coat the thin film by vacuum evaporation; S2, complete the thin film prep...

Embodiment 2

[0066] A far-infrared short-wave cut-off film for molding an aspheric lens, comprising a first optical surface and a second optical surface;

[0067] The first optical surface includes the following components by weight:

[0068] 2 parts of yttrium oxide;

[0069] 70 parts of ytterbium fluoride;

[0070] 10 parts of zinc sulfide;

[0071] Germanium 20 parts;

[0072] The second optical surface includes the following components by weight:

[0073] 2 parts of yttrium oxide;

[0074] 55 parts of ytterbium fluoride;

[0075] 35 parts of zinc sulfide;

[0076] Germanium 15 parts.

[0077] A production process for a far-infrared short-wave cut-off film for a molded aspheric lens, comprising the following steps: S1, coating the first optical surface and the second optical surface of the lens with different properties and different thicknesses of the film layers, Use an infrared optical coating machine to coat the thin film by vacuum evaporation; S2, complete the thin film pre...

Embodiment 3

[0079] A far-infrared short-wave cut-off film for molding an aspheric lens, comprising a first optical surface and a second optical surface;

[0080] The first optical surface includes the following components by weight:

[0081] 3 parts of yttrium oxide;

[0082] 75 parts of ytterbium fluoride;

[0083] 5 parts of zinc sulfide;

[0084] Germanium 15 parts;

[0085] The second optical surface includes the following components by weight:

[0086] 1 part of yttrium oxide;

[0087] 50 parts of ytterbium fluoride;

[0088] 40 parts of zinc sulfide;

[0089] Germanium 20 parts.

[0090] A production process for a far-infrared short-wave cut-off film for a molded aspheric lens, comprising the following steps: S1, coating the first optical surface and the second optical surface of the lens with different properties and different thicknesses of the film layers, Use an infrared optical coating machine to coat the thin film by vacuum evaporation; S2, complete the thin film prepa...