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Low Reflection Neutral Density Filters

A neutral density, filter technology, applied in the direction of filters, optics, optical components, etc., can solve the problems of color cast, inability to meet instruments and equipment, poor neutrality, etc., to achieve the effect of taking into account performance

Active Publication Date: 2017-01-18
SHENYANG ACAD OF INSTR SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is a low-reflection neutral density filter on the market, but it is based on a resin sheet and obtained through a chemical reaction. Good (color cast) and other shortcomings, unable to meet the needs of high-end instruments and equipment

Method used

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example 1

[0039] Example 1: Single-sided coating structure

[0040] Substrate: B270 glass

[0041] Dielectric material: TiO 2 , SiO 2

[0042] Metal material: Ni-Cr.

[0043] The following film system is plated on one side of the substrate.

[0044]

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Abstract

The invention belongs to the field of optical elements for optical energy attenuation, and particularly relates to a low-reflection and neutral-density filter. The low-reflection and neutral-density filter comprises a substrate and a membrane system layer arranged on the substrate in a plated mode. The membrane system layer is of a G|AMB structure or a BM|G|MB structure, wherein M is a metal layer for achieving transmission attenuation and neutral transmission, G is the substrate, A and B are membrane stacks working cooperatively to achieve wide-spectrum metal antireflection and are each formed by dielectric layers and the metal layers M in an alternately plated mode, the metal layers M are made of Ni-Cr or Ni-Cr-Fe, and the dielectric layers are made of TiO2 or SiO2 or Al2O3 or HfO2 or Ta2O5 or Nb2O5. The low-reflection and neutral-density filter has both low reflection and transmission spectrum neutrality in a wide spectral range.

Description

technical field [0001] The invention belongs to the field of light energy attenuation optical elements, in particular to a low-reflection neutral density filter. Background technique [0002] Neutral density filters can uniformly attenuate light in the same proportion in a wide range of wavelengths, and have no selectivity for wavelengths. They are widely used in various instruments and equipment that require attenuation of light energy. The traditional preparation method of the neutral density filter is to coat a solid metal film on the surface of the substrate, and use the light absorption and reflection function of the metal to attenuate the light energy. However, this type of neutral density filter often has a strong reflection effect on light, and the reflectivity is generally above 50%, which makes it unable to be used in the imaging field. [0003] The neutral density filter used in the imaging field has two basic technical requirements: ① Spectral neutrality - the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/20G02B1/115
CPCG02B1/115G02B5/205
Inventor 阴晓俊高鹏张勇喜金秀马敬赵珑现
Owner SHENYANG ACAD OF INSTR SCI
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