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Infrared cut-off filter with low-angle effect

A technology of infrared cut-off and optical filter, which is applied in the field of optical filter, can solve the problems of complex processing technology and high cost of raw materials, and achieve the effect of less center wavelength shift and simple structure

Inactive Publication Date: 2012-10-17
MODERN PHOTOELECTRIC TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to realize the angle effect of the central wavelength and cut-off bandwidth on the imaging system when the incident angle is large, blue glass substrates have been used in the high-end field to improve the angle effect of the light source, but the high cost of raw materials and complicated processing technology are not conducive to Massive popularity in low-end products

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  • Infrared cut-off filter with low-angle effect
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  • Infrared cut-off filter with low-angle effect

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing, the present invention will be further described as follows:

[0013] as attached figure 1 As shown, the present invention includes a base layer 1, the two sides of the base layer 1 are respectively coated with composite film layers 2, and the composite film layers are alternately composed of high refractive index material film layers 3 and low refractive index material film layers 4 form. The high refractive index material film layer 3 is composed of one or more of titanium dioxide, trititanium pentoxide, zirconium oxide, tantalum pentoxide, niobium pentoxide, and zinc sulfide, and the low refractive index material film layer 4 is composed of one or more of silicon dioxide, magnesium fluoride, and aluminum oxide. The thickness of the composite film layer on both sides of the base layer is 100-10000nm.

[0014] The production process of the present invention: first, clean the surface of the base layer 1, and then alterna...

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Abstract

The invention relates to a technical field of a filter, and more specifically relates to an infrared cut-off filter with a low-angle effect. The filter comprises a basement layer, and composite membrane layers are respectively coated on both side surfaces of the basement layer. High-index material films and low-index material films are alternatively formed the composite membrane layers. Compared with the filter in the prior art, the filter provided in the invention has the advantages of novelty and simple structure. According to the invention, using effects of blue glass basement is realized or approached by film coating. With the filter, production cost can be effectively reduced and using effect of the present ordinary infrared cut-off filter can be substantially improved. When the filter is used for light source inclination incidence or big cone angle incidence, not only center wavelength moves less but also spectrum curve can maintain good characteristics. With the filter, restriction is broken through, wherein the restriction is that the present infrared cut-off filter can not satisfy wide angle inclination incidence.

Description

[technical field] [0001] The invention relates to the technical field of optical filters, in particular to a low-angle effect infrared cut-off filter. [Background technique] [0002] Infrared cut-off filter is an optical filter with high and low refractive index alternately coated on the optical substrate by using precision optical coating technology to achieve high transparency in the visible light region (400-630nm) and cut-off in the near-infrared (700-1100nm) , mainly used in digital imaging fields such as mobile phone cameras, computer built-in cameras, car cameras, etc., to eliminate the influence of infrared light on CCD / CMOS imaging. By adding an infrared cut filter to the imaging system to block the part of the infrared light that interferes with the imaging quality, the resulting image can be more in line with the best perception of the human eye. In order to realize the angle effect of the central wavelength and cut-off bandwidth on the imaging system when the in...

Claims

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Application Information

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IPC IPC(8): G02B5/20B32B9/04B32B33/00
Inventor 陈晓团
Owner MODERN PHOTOELECTRIC TECH SHANGHAI
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