CN116990895A - All-dielectric structural color film with small-angle color shift effect - Google Patents
All-dielectric structural color film with small-angle color shift effect Download PDFInfo
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- CN116990895A CN116990895A CN202311097060.5A CN202311097060A CN116990895A CN 116990895 A CN116990895 A CN 116990895A CN 202311097060 A CN202311097060 A CN 202311097060A CN 116990895 A CN116990895 A CN 116990895A
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- layer
- film
- refractive index
- diffraction
- light
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- 230000000694 effects Effects 0.000 title claims abstract description 45
- 239000010410 layer Substances 0.000 claims abstract description 130
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001887 tin oxide Inorganic materials 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract description 6
- 239000003086 colorant Substances 0.000 description 5
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/285—Interference filters comprising deposited thin solid films
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1814—Diffraction gratings structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
Abstract
The invention relates to the technical field of structural color films, in particular to a full-medium structural color film with a small-angle color shift effect. The light interference structure comprises a bottom layer with a picture and a transparent surface layer; the optical interference structure comprises an interference filter, a diffraction layer and an effect layer, wherein the diffraction layer and the effect layer are positioned between the two interference filters; the diffraction layer comprises a transmission grating and a scattering film layer arranged on the transmission grating; the effect layer comprises a plurality of high refractive index film layers and a plurality of low refractive index film layers, and the high refractive index film layers and the low refractive index film layers are alternately stacked. In the invention, when light is reflected back to the high-density transmission grating, the diffraction angle of the high-density grating is larger, the purity of the diffracted color is higher, a wider diffraction spectrum can be observed under a low deflection angle, and when the light passes through the scattering film layer and the effect layer after being diffracted, reflection and refraction occur, so that the reflection and transmission of the light are coherently overlapped, and the color of the light corresponding to the wavelength is displayed.
Description
Technical Field
The invention relates to the technical field of structural color films, in particular to a full-medium structural color film with a small-angle color shift effect.
Background
The structural color film is structural color development realized in a physical layer by a film interlayer light interference effect, and mainly uses colors generated by optical phenomena such as refraction, reflection and the like generated when light propagates between film layers.
The structural color film is based on the premise that the structural color film works at a specific incidence angle of light, when the incidence angle of the light changes, the tone of the structural color of the film changes, the existing structural color film is generally formed by alternately stacking a plurality of layers of high-low refractive index light interference filter film layers, under the condition of changing the incidence angle of the light, the reflected or transmitted spectrum is shifted due to the fact that the equivalent optical path length of a film stack sequence changes along with the angle, so that the film presents different structural colors, but when the existing structural color film is observed, a quite large angle is required to deflect to see different structural colors which can be presented by the structural color film, the dependence on the angle is too large, the structural color display effect is poor when the structural color film is applied to a large-sized plane plate such as an advertisement plate, but the other extreme condition is that the structural color which can be presented by the structural color film under the condition of low deflection angle causes visual pollution, and thus the observation of pattern content is influenced.
In order to observe different structural colors of the structural color film and avoid visual pollution under the premise of low deflection angle, an all-medium structural color film with a small-angle color shift effect is provided.
Disclosure of Invention
The invention aims to provide an all-dielectric structural color film with a small-angle color shift effect so as to solve the problems in the background art.
In order to achieve the above object, the present invention provides an all-dielectric structural color film with a small-angle color shift effect, which comprises a bottom layer with a pattern, a transparent surface layer, and an optical interference structure arranged between the bottom layer and the transparent surface layer;
the optical interference structure comprises interference filters at two ends, and a diffraction layer and an effect layer which are positioned between the two interference filters, wherein the diffraction layer is close to the bottom layer with the pattern, and the effect layer is close to the transparent surface layer;
the diffraction layer comprises a transmission grating close to the bottom layer with the pattern and a scattering film layer which is arranged on the transmission grating and is in contact with the effect layer;
the effect layer includes a plurality of high refractive index film layers and a plurality of low refractive index film layers, and the high refractive index film layers and the low refractive index film layers are alternately stacked.
As a further improvement of the technical scheme, the transmission grating is a volume holographic grating, and the grating length of the transmission grating is in the range of 0.35-0.50 mu m.
As a further improvement of the technical scheme, the scattering film layer is a composite transparent film prepared from tin oxide nano-particles and titanium dioxide particles or silicon dioxide particles.
As a further improvement of the technical scheme, the thickness of the scattering film layer is in the range of 40-120 mu m.
As a further improvement of the technical scheme, the interference filter is a short-wave pass filter with the passing wave band range of 400-480 nm.
As a further improvement of the technical scheme, the refractive index range of the high refractive index film layer is 2.2-2.6, the refractive index range of the low refractive index film layer is 1.2-2.2, and the total layer number range of the high refractive index film layer and the low refractive index film layer is 12-30.
As a further improvement of the technical scheme, the bottom layer with the pattern comprises an aluminum substrate total reflection film layer and an adhesion layer arranged at the bottom of the aluminum substrate reflection film layer.
As a further improvement of the technical scheme, the transparent surface layer is an amorphous magnesium fluoride film.
Compared with the prior art, the invention has the beneficial effects that:
1. in the full-medium structural color film with the small-angle color shift effect, the aluminum substrate full-reflection film layer with the pattern bottom layer is used for reflection, when light is reflected back to the high-density transmission grating, the diffraction angle of the high-density grating is larger, the diffraction color purity of the high-density grating is higher, a wider diffraction spectrum can be observed under the low deflection angle, and when the light passes through the scattering film layer and the effect layer after being diffracted, reflection and refraction are carried out, so that the reflection and transmission of the light are coherently overlapped, and the color of the light corresponding to the wavelength is displayed.
2. In the all-dielectric structural color film with the small-angle color shift effect, the interference filter adopts the short-wave pass filter, can provide transition from transmission to reflection and excellent contrast, improves the resolution capability of patterns, and ensures that the features to be observed are clearer.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the light propagation path of the effect layer according to the present invention.
The meaning of each reference sign in the figure is:
1. a bottom layer with a picture; 2. a transparent surface layer; 31. an interference filter; 32. a diffraction layer; 33. an effect layer; 331. a high refractive index film layer; 332. a low refractive index film layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Referring to fig. 1, the present embodiment is directed to providing an all-dielectric structural color film with a small-angle color shift effect, which includes a patterned bottom layer 1 for adhering to the surface of an object and providing a pattern, a transparent surface layer 2 for transmitting light and protecting the film, and an optical interference structure disposed therebetween;
the optical interference structure comprises interference filters 31 at two ends, and a diffraction layer 32 and an effect layer 33 which are positioned between the two interference filters 31, wherein the diffraction layer 32 is close to the bottom layer 1 with the pattern, and the effect layer 33 is close to the transparent surface layer 2;
the diffraction layer 32 comprises a transmission grating proximate the patterned bottom layer 1, and a scattering film layer disposed on the transmission grating in contact with the effect layer 33;
the effect layer 33 includes a plurality of high refractive index film layers 331 and a plurality of low refractive index film layers 332, and the high refractive index film layers 331 and the low refractive index film layers 332 are alternately stacked.
Principle of: the light is incident through the transparent surface layer 2, after passing through the interference filter 31, the light with a specific spectrum range enters the light interference structure, and the light can generate multiple reflection and refraction phenomena when passing through the effect layer 33 and the diffraction layer 32 in sequence, wherein the refraction light passes through the diffraction layer 32 and the effect layer 33 through total reflection of the bottom layer 1 with the pattern, and exits the structural color film after passing through the interference filter 31 and the transparent surface layer 1, and the focus is that when the light passes through the transmission grating of the diffraction layer 32, the reflection and transmission of the light are coherently overlapped due to the diffraction effect of the transmission grating, and the color of the light corresponding to the wavelength is displayed.
Further, the transmission grating is a volume holographic grating, the grating length range of the transmission grating, namely the interval length of the grooves or the bulges on the grating surface is 0.35-0.50 mu m,
from d (sin β±sin θ) =mλ (m=0, ±1, ±2 … …), where: d is the grating period, namely the grating length, beta is the light incidence angle, theta is the exit angle of the diffraction direction and the normal, m is the diffraction order, lambda is the diffraction wavelength, the formula shows that the diffraction angle of the high-density grating is larger, the purity of the diffracted color is higher, and a wider diffraction spectrum can be observed under the condition of low deflection angle.
Furthermore, the scattering film layer is a composite transparent film prepared from tin oxide nano particles and titanium dioxide particles or silicon dioxide particles, the thickness range of the scattering film layer is 40-120 mu m, the scattering film layer has good spectral characteristics, the transmittance during light scattering is good, and the optical loss during light scattering can be effectively reduced.
Still further, the interference filter 31 is a short-wave pass filter with a band ranging from 400 nm to 480nm, which can provide transition from transmission to reflection and provide excellent contrast, and enhance resolution of patterns, so that the features to be observed are clearer.
Further, the refractive index of the high refractive index layer 331 ranges from 2.2 to 2.6, the refractive index of the low refractive index layer 332 ranges from 1.2 to 2.2, the total layer number of the high refractive index layer 331 and the low refractive index layer 332 ranges from 12 to 30, and when light propagates in the effect layer 33, due to the difference of refractive indexes, as shown in fig. 2, the light can generate reflection, refraction and other light phenomena at the interface between the high refractive index layer 331 and the low refractive index layer 332, and the light is coherently superimposed through reflection and transmission, so that the light is reinforced in a part of the wavelength interval, and the color of the wavelength can be displayed.
In addition, the patterned bottom layer 1 includes an aluminum-based total reflection film layer in which a pattern is engraved by photolithography and an adhesion layer provided at the bottom of the aluminum-based reflection film layer, through which a film can be fixed to the surface of an object, and the aluminum-based total reflection film layer can reflect light rays, exhibit the pattern engraved on the film layer, and the transparent surface layer 2 is an amorphous magnesium fluoride film having an extinction coefficient of 0, and can avoid loss of light rays when passing through the transparent surface layer by using the amorphous magnesium fluoride film as a protective film of the film.
In specific use, light rays enter the structural color film through the transparent surface layer 2, when the light rays pass through the interference filter 31, reflection interference can limit light in a specific spectral range to enter the light interference structure, the light rays sequentially pass through the effect layer 33 and the diffraction layer 32, when the light rays pass through the effect layer 33, due to different refractive indexes, light rays such as reflection and refraction occur on the interface between the high refractive index film layer 331 and the low refractive index film layer 332, the refraction light enters the diffraction layer 32 and passes through the transmission grating to the belt chart bottom layer 1, the refraction light rays are reflected by the aluminum substrate total reflection film layer of the belt chart bottom layer 1, when the light rays are reflected back through the high-density transmission grating, due to the fact that the diffraction angle of the high-density grating is larger, the diffraction spectrum of the diffraction light rays can be observed under the low deflection angle, and when the light rays pass through the scattering film layer 33 after diffraction, reflection and refraction occur again, so that reflection transmission of the light rays are coherently overlapped, and colors with corresponding wavelengths are displayed.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a full medium structure look film with little angle colour shift effect which characterized in that: comprises a bottom layer (1) with a picture and a transparent surface layer (2) and an optical interference structure arranged between the bottom layer and the transparent surface layer;
the optical interference structure comprises interference filters (31) at two ends, and a diffraction layer (32) and an effect layer (33) which are arranged between the two interference filters (31), wherein the diffraction layer (32) is close to the bottom layer (1) with the pattern, and the effect layer (33) is close to the transparent surface layer (2);
the diffraction layer (32) comprises a transmission grating close to the bottom layer (1) with the pattern and a scattering film layer which is arranged on the transmission grating and is in contact with the effect layer (33);
the effect layer (33) includes a plurality of high refractive index film layers (331) and a plurality of low refractive index film layers (332), and the high refractive index film layers (331) and the low refractive index film layers (332) are alternately stacked.
2. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the transmission grating is a volume holographic grating, and the grating length of the transmission grating ranges from 0.35 mu m to 0.50 mu m.
3. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the scattering film layer is a composite transparent film prepared from tin oxide nano particles and titanium dioxide particles or silicon dioxide particles.
4. A full-media structured color film having a small angle color shift effect as defined in claim 3, wherein: the thickness of the scattering film layer ranges from 40 to 120 mu m.
5. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the interference filter (31) is a short-wave pass filter with the passing wave band range of 400-480 nm.
6. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the refractive index range of the high refractive index film layer (331) is 2.2-2.6, the refractive index range of the low refractive index film layer (332) is 1.2-2.2, and the total layer number range of the high refractive index film layer (331) and the low refractive index film layer (332) is 12-30.
7. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the bottom layer (1) with the pattern comprises an aluminum substrate total reflection film layer and an adhesion layer arranged at the bottom of the aluminum substrate reflection film layer.
8. The all-dielectric structured color film with small angle color shift effect according to claim 1, wherein: the transparent surface layer (2) is an amorphous magnesium fluoride film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311097060.5A CN116990895B (en) | 2023-08-29 | 2023-08-29 | All-dielectric structural color film with small-angle color shift effect |
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| CN202311097060.5A CN116990895B (en) | 2023-08-29 | 2023-08-29 | All-dielectric structural color film with small-angle color shift effect |
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| CN116990895A true CN116990895A (en) | 2023-11-03 |
| CN116990895B CN116990895B (en) | 2024-02-23 |
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| CN115576045A (en) * | 2022-11-09 | 2023-01-06 | 厦门大学 | Colored nano film structure with protection function, preparation method and application |
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| CN1440039A (en) * | 2002-02-20 | 2003-09-03 | 富士胶片株式会社 | Radioactive ray image forming materials and method thereof |
| US20030224164A1 (en) * | 2002-05-31 | 2003-12-04 | Flex Products, Inc., A Jds Uniphase Company | All-dielectric optical diffractive pigments |
| JP2004138938A (en) * | 2002-10-21 | 2004-05-13 | Sony Corp | Screen and its manufacturing method |
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| CN116990895B (en) | 2024-02-23 |
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