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Optical filter

A technology of optical filters and concave gratings, which is applied in the field of optical filters, can solve problems affecting the anti-reflection performance of anti-reflection coatings, restrictions on the refractive index of anti-reflection coatings, and limitations on the range of refractive index values ​​​​of films, and achieve anti-reflection wavelength range Wide, overcoming material limitations, high penetration rate effect

Inactive Publication Date: 2009-04-01
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the anti-reflection coating layer is made of multiple layers of dielectric layers with different reflectivity materials, which are deposited on the light-transmitting substrate, so there are problems such as the range of the refractive index of the film is limited, that is, the refractive index of the anti-reflection film is limited. limit
In addition, under conditions such as high temperature, unsatisfactory thickness and uniformity of the anti-reflection film, the anti-reflection performance of the anti-reflection film will be affected.

Method used

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Embodiment Construction

[0015] see Figure 2 to Figure 5 , is the first preferred embodiment of the optical filter of the present invention, and the optical filter 200 includes a light-transmitting substrate 210 , a light-filtering coating layer 220 , and an anti-reflection structure 230 .

[0016] The transparent substrate 210 is made of transparent resin material or glass material and has a first surface 2101 and a second surface 2102 opposite to the first surface 2101 .

[0017] The filter coating layer 220 is a dielectric layer with multiple layers of materials with different reflectivity alternated, and is deposited on the first surface 2101 of the light-transmitting substrate 210 . The deposition process adopts physical vapor deposition, such as thermal evaporation, plasma sputtering and ion beam sputtering, or chemical vapor deposition and other thin film growth methods.

[0018] The anti-reflection structure 230 is a periodic concave grating. In this embodiment, the periodic concave grating...

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Abstract

The invention provides a filter, comprising a filter substrate, a light transmission coating layer, and an anti-reflection structure; the filter coating layer structure is arranged on the first surface of the light transmission substrate; the anti-reflection structure is arranged on the second surface of the light transmission substrate corresponding to the first surface; the anti-reflection structure is provided with a periodic concave grid structure, has the advantages of wide anti-reflection wavelength range, high penetration rate and the like and is extremely suitable for precise optical application.

Description

technical field [0001] The invention relates to an optical filter, in particular to an optical filter with an anti-reflection structure, which is suitable for an optical system in which the optical filter is applied. Background technique [0002] As an optical filter, the optical filter can pass light of a specific wavelength. Its main structure is that one surface of the light-transmitting substrate is coated with multiple layers of dielectric layers with different reflectivity materials to achieve the effect of filtering. It is traditionally called It is the filter coating layer; however, in order to increase the transmittance of the light that needs to pass through the filter coating layer, an anti-reflection film is usually coated on the other surface of the light-transmitting substrate opposite to the filter coating layer. [0003] see figure 1 , is a schematic diagram of an existing optical filter structure. The optical filter 100 includes a transparent substrate 110...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02B1/11
CPCG02B5/20G02B1/118G02B5/1814
Inventor 何侑伦简义本
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD