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Membrane stack structure

A membrane stack and periodic structure technology, applied in optical components, optics, instruments, etc., can solve the problems of poor spectral filtering effect, decreased reflectivity of transmission spectrum characteristics, reflection band, etc.

Inactive Publication Date: 2009-12-30
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
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Problems solved by technology

[0008] In summary, the existing membrane stack structure 2 (HL) 18 Due to the large difference in the refractive index of high and low refractive index materials, the effect of spectral filtering is poor, the transmission spectral characteristics change significantly with the angle, and the reflectivity of the reflection band decreases when the incident angle is large.

Method used

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Embodiment Construction

[0020] see Figure 5 , which is a schematic diagram of the membrane stack structure 10 provided by the present invention. The membrane stack structure 10 includes a transparent substrate 102 and a periodic membrane stack 104 stacked thereon. The periodic structure of the periodic film stack 104 is a high refractive index film layer 106 and a middle refractive index layer 108 stacked alternately. The periodic structure of the periodic membrane stack 104 can be expressed as (HM) n , wherein, H represents a high refractive index film layer 106, M represents a middle refractive index film layer 104, the ratio of the coefficients in front of H and M represents the optical thickness ratio of each refractive index film layer, and the superscript n represents the periodicity The period number of the structure.

[0021] The periodic membrane stack 104(HM) n The high refractive index film layer 106 and the middle refractive index film layer 108 have the same optical thickness. The ...

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Abstract

The invention provides a membrane stack structure comprising a transparent substrate and a periodic membrane stack stacked on the transparent substrate. The periodic structure of the periodic membrane stack is formed by mutually stacking a membrane layer with high refractive index and a middle refractive index membrane layer in a refractive index range from 1.71 to 1.79 or from 1.81 to 1.86. The periodic membrane stack uses the middle refractive index membrane layer to lower refractive index difference values among different refractive index membrane layers, reduce the translation effect of parallel polarization spectrum lines and vertical polarization spectrum lines of the membrane stack and improve the color-splitting and wave-filtering effects of the membrane stack.

Description

technical field [0001] The invention relates to a membrane stack structure, in particular to a membrane stack structure applied to a beam splitting prism. Background technique [0002] At present, optical coatings have been widely used in projectors, traditional cameras, digital cameras, mobile phones, lens groups and filters used in astronomical telescopes, etc., to enable these optical components to achieve different optical functions, such as absorbing ultraviolet rays , anti-reflection, color filter, infrared cut-off, etc. [0003] Such as figure 1 As shown, the present invention relates to a membrane stack structure 2 applied in a dichroic prism 1 . The dichroic prism 1 is used in color separation systems of various optical instruments. After the external light enters the dichroic prism 1, it is incident on the surface 3 coated with the membrane stack structure 2 at an angle of 45 degrees. The light in the transmission wavelength range passes through the membrane sta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10
CPCG02B27/283
Inventor 詹博文
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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