CN114509835A - Reflective film, preparation method thereof, shell assembly and electronic equipment - Google Patents

Reflective film, preparation method thereof, shell assembly and electronic equipment Download PDF

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Publication number
CN114509835A
CN114509835A CN202210140763.0A CN202210140763A CN114509835A CN 114509835 A CN114509835 A CN 114509835A CN 202210140763 A CN202210140763 A CN 202210140763A CN 114509835 A CN114509835 A CN 114509835A
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China
Prior art keywords
reflective
reflective film
film
film layers
reflecting
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Pending
Application number
CN202210140763.0A
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Chinese (zh)
Inventor
赵荣琦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to CN202210140763.0A priority Critical patent/CN114509835A/en
Publication of CN114509835A publication Critical patent/CN114509835A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • G02B5/0825—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only
    • G02B5/0841—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only comprising organic materials, e.g. polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0217—Mechanical details of casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The application discloses a reflective film, a method of manufacturing the same, a housing assembly, and an electronic device. The reflective film comprises a plurality of first reflective film layers and a plurality of second reflective film layers, wherein the first reflective film layers and the second reflective film layers are alternately stacked, the first reflective film layers are formed by first reflective polymer raw materials, the second reflective film layers are formed by second reflective polymer raw materials, and the refractive index of the first reflective film layers is different from that of the second reflective film layers. Therefore, the reflecting film has high reflectivity, the stress in the reflecting film formed by the high polymer material is small, the reflecting film is attached to the shell of the electronic equipment, the appearance effect of the electronic equipment can be well improved, and the reflecting film is not easy to crack, fall off or wrinkle.

Description

Reflective film, preparation method thereof, shell assembly and electronic equipment
Technical Field
The present application relates to the field of electronics, and in particular, to a reflective film, a method of manufacturing the same, a housing assembly, and an electronic device.
Background
With the increasing living standard, users pay more and more attention to the appearance of electronic devices such as mobile phones, and many users desire that the housing (for example, the rear cover of the mobile phone) of the electronic devices such as the mobile phones have higher brightness and appearance effect. At present, a reflection film layer is usually arranged in a technical scheme for improving the brightness of a shell, but the existing reflection film layers all have obvious defects, for example, the reflectivity of an indium oxide film layer is relatively low, only about 60% of reflectivity can be realized, and the brightness of the shell cannot be well improved; the silver film layer can realize the reflectivity of about 95 percent, but the silver film layer is conductive and has an electromagnetic shielding effect, and the signal transmission of electronic equipment can be influenced when the silver film layer is used for a shell of the electronic equipment such as a mobile phone and the like; the reflectivity of the oxide optical film is positively correlated with the film thickness, the oxide optical film can achieve high reflectivity only by laminating thick thicknesses, the oxide optical film with the thickness of more than 1000nm can achieve about 90% reflectivity, but the oxide optical film with the thickness of more than 1000nm has high internal stress, and is easy to cause defects such as cracking, falling, wrinkling and the like.
Therefore, the current reflective film, the method for preparing the same, the housing assembly, and the electronic device still need to be further improved.
Disclosure of Invention
The present application aims to mitigate or solve at least to some extent at least one of the above mentioned problems.
In view of this, in one aspect of the present disclosure, a reflective film is provided, where the reflective film includes a plurality of first reflective film layers and a plurality of second reflective film layers, the plurality of first reflective film layers and the plurality of second reflective film layers are alternately stacked, the first reflective film layers are formed by a first reflective polymer material, the second reflective film layers are formed by a second reflective polymer material, and a refractive index of the first reflective film layers is different from a refractive index of the second reflective film layers. Therefore, the reflecting film has high reflectivity, the stress in the reflecting film formed by the high polymer material is small, the reflecting film is attached to the shell of the electronic equipment, the appearance effect of the electronic equipment can be well improved, and the reflecting film is not easy to crack, fall off or wrinkle.
In another aspect of the present application, a method of making a reflective film is presented, the method comprising: providing a first reflective polymer raw material and a second reflective polymer raw material; placing the first reflective polymeric feedstock and the second reflective polymeric feedstock in a plurality of dies; co-extruding to obtain a reflecting film; the reflective film comprises a plurality of first reflective film layers and a plurality of second reflective film layers, wherein the first reflective film layers and the second reflective film layers are alternately stacked, the first reflective film layers are formed by first reflective polymer raw materials, the second reflective film layers are formed by second reflective polymer raw materials, and the refractive index of the first reflective film layers is different from that of the second reflective film layers. Therefore, the reflection film with excellent performance can be formed by a co-extrusion method, a multi-layer film structure is formed at one time, the production efficiency can be obviously improved, and the product yield is high.
In yet another aspect of the present application, the present application provides a housing assembly comprising: a substrate; a reflective film disposed on one side of the substrate, the reflective film being as recited in the preceding claim. Thus, the housing assembly has all the features and advantages of the reflective film described above, and will not be described herein. Overall, the housing assembly has good appearance properties; moreover, the reflecting film in the shell assembly is well attached to the base body, and the reflecting film is not easy to crack, wrinkle or fall off, so that the shell assembly has better overall stability.
In yet another aspect of the present application, the present application proposes an electronic device comprising: the housing assembly described above; the display screen assembly is connected with the shell assembly, an installation space is defined between the display screen assembly and the shell assembly, and the reflecting film in the shell assembly is arranged close to the installation space; and the mainboard is arranged in the installation space and is electrically connected with the display screen assembly. Thus, the electronic device has all the features and advantages of the housing assembly described above, and thus, the description thereof is omitted.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural view of a reflective film according to one example of the present application;
FIG. 2 shows a schematic structural view of a housing assembly according to one example of the present application;
FIG. 3 shows a schematic structural view of a housing assembly according to another example of the present application;
fig. 4 shows a schematic structural diagram of an electronic device according to an example of the application.
Description of reference numerals:
100: a reflective film; 110: a first reflective film layer; 120: a second reflective film layer; 200: a substrate; 300: a texture layer; 400: coating a film layer; 500: an ink layer; 1000: an electronic device.
Detailed Description
Examples of the present application are described in detail below and are illustrated in the accompanying drawings. The examples described below with reference to the drawings are only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
According to an example of the present application, referring to fig. 1, a reflective film 100 includes a plurality of first reflective film layers 110 and a plurality of second reflective film layers 120, wherein the plurality of first reflective film layers 110 and the plurality of second reflective film layers 120 are alternately stacked, the first reflective film layers 110 are formed of a first reflective polymer material, the second reflective film layers 120 are formed of a second reflective polymer material, and a refractive index of the first reflective film layers 110 is different from a refractive index of the second reflective film layers 120. Therefore, the reflecting film is formed by alternately laminating a first reflecting film layer and a second reflecting film layer with refractive indexes, so that the reflecting film has high reflectivity; and the first reflecting film layer and the second reflecting film layer in the reflecting film are both formed by high polymer materials, so that the internal stress of the reflecting film is small, and cracking, falling or wrinkling is not easy to occur.
According to an example of the present application, the first reflective polymer material may include PET (polyethylene terephthalate) and the second reflective polymer material may include PEN (polyethylene naphthalate). This is advantageous in further improving the reflectance of the reflective film.
According to some specific examples of the present application, the first reflective polymer material may be composed of only PET, the second reflective polymer material may be composed of only PEN, the refractive index of PET is 1.65, which is relatively low, and the refractive index of PEN is 1.8, which is relatively high, and the reflectivity of the reflective film may be significantly improved by alternately laminating PET film layers and PEN film layers.
According to an example of the present application, referring to fig. 1, the thickness of the first reflective film layer 110 is denoted as d1, and the thickness of the second reflective film layer 120 is denoted as d2, wherein the thicknesses d1 of the plurality of first reflective film layers 110 are not identical, and the thicknesses d2 of the plurality of second reflective film layers 120 are not identical.
In the present application, the reflected light is intensified according to the formula 2nd ═ K +1/2 × λ by using the principle of optical interference intensification, so that high reflectance can be realized. Where n is a refractive index of a single film layer (the first reflective film layer or the second reflective film layer), d is a thickness of the first reflective film layer or the second reflective film layer, K is a positive integer, for example, 1, 2, 3 … …, λ is a wavelength of a light to be reflected, the thickness of the single-layer first reflective film layer or the thickness of the single-layer second reflective film layer can be calculated by the formula, and since the light to be reflected has different wavelengths and K can take different values, the thicknesses d1 of the plurality of first reflective film layers 110 are not completely the same, and the thicknesses d2 of the plurality of second reflective film layers 120 are not completely the same. According to an example of the present application, the thicknesses of the two or more first reflective film layers 110 reflecting the same wavelength band may be the same, and the thicknesses of the two or more second reflective film layers 120 reflecting the same wavelength band may also be the same.
According to some specific examples of the present application, in the reflective film, the first reflective film layers 110 and the second reflective film layers 120 partially alternately stacked may be for reflecting light in a wavelength range of 380 to 400 nm, the first reflective film layers 110 and the second reflective film layers 120 partially alternately stacked may be for reflecting light in a wavelength range of 400 to 420 nm, … …, and the first reflective film layers 110 and the second reflective film layers 120 partially alternately stacked may be for reflecting light in a wavelength range of 760 to 780 nm. The thickness of the corresponding film layer can be calculated correspondingly by the formula 2nd ═ K +1/2 × λ, so that the reflectivity of the reflective film 100 to the light with the wavelength of 380-780 nm is greater than or equal to 95%.
According to the present disclosure, the thickness d1 of the first reflective film layer 110 is 100 to 200 nm, such as 100 nm, 110 nm, 120 nm, 150 nm, 180 nm, 200 nm, etc., and the thickness d2 of the second reflective film layer 120 is 100 to 200 nm, such as 100 nm, 130 nm, 150 nm, 180 nm, 200 nm, etc. Therefore, the first reflecting film layer and the second reflecting film layer are both provided with proper thicknesses, and the reflectivity of the reflecting film is improved.
According to an example of the present application, referring to fig. 2, the thickness D of the reflective film 100 is 30 to 100 micrometers, for example, the thickness D of the reflective film 100 may be 30 micrometers, 40 micrometers, 50 micrometers, 70 micrometers, 90 micrometers, 100 micrometers, and the like. Accordingly, the thickness of the reflective film 100 is set within the above range, the quality of the electronic device case or the electronic device is not significantly increased, and the appearance effect of the electronic device or the electronic device case can be improved. It should be noted that, when an indium oxide film layer, a silver film layer, or an oxide optical film layer is adopted, the film layers need to be formed on a substrate, and usually, a PET film material with a thickness of several tens to hundreds of micrometers is also adopted as the substrate.
According to an example of the present application, the total number of the first reflective film layer 110 and the second reflective film layer 120 may be 100 to 500, for example, 100, 200, 300, 400, 500, and the like, and the reflectivity of the reflective film in a certain wavelength range may be improved by alternately stacking the first reflective film layer and the second reflective film layer.
Generally speaking, the reflective film that this application provided has high reflectivity, and the reflective film is difficult for fracture, fold, sets up it in electronic equipment's such as cell-phone casing, and this reflective film is also difficult for fracture, fold or drop, can make the casing have good outward appearance effect and overall stability.
In another aspect of the present application, a method of making a reflective film is presented, the method comprising the steps of:
s100: a first reflective polymeric material and a second reflective polymeric material are provided.
In this step, a first reflective polymeric material and a second reflective polymeric material are provided, wherein the refractive index of the first reflective polymeric material is different from the refractive index of the second reflective polymeric material.
The first reflective polymer raw material and the second reflective polymer raw material can be granular or powdery, and can be extruded to form a sheet through a die with a slit after being melted and plasticized.
S200: the first reflective polymeric feedstock and the second reflective polymeric feedstock are placed in a plurality of dies.
In this step, the first reflective polymer raw material and the second reflective polymer raw material are respectively placed in a plurality of dies, so that after the raw materials are co-extruded from the plurality of dies, the film layer formed by the first reflective polymer raw material and the film layer formed by the second reflective polymer raw material are alternately stacked.
S300: and co-extruding to obtain the reflecting film.
After the first reflective high polymer raw material and the second reflective high polymer raw material are placed in a plurality of die heads, the reflective film is obtained through co-extrusion. As shown in fig. 1, the reflective film 100 includes a plurality of first reflective film layers 110 and a plurality of second reflective film layers 120, the plurality of first reflective film layers 110 and the plurality of second reflective film layers 120 are alternately stacked, the first reflective film layers 110 are formed by a first reflective polymer material, the second reflective film layers 120 are formed by a second reflective polymer material, and a refractive index of the first reflective film layers 110 is different from a refractive index of the second reflective film layers 120.
According to an example of the present application, the step of co-extruding to obtain the reflective film comprises:
s310: the first reflective polymeric raw material and the second reflective polymeric raw material are extruded from a plurality of dies to form an initial reflective film.
The first reflective high polymer raw material and the second reflective high polymer raw material are extruded from the die heads to form an initial reflective film, wherein the first reflective high polymer raw material forms a first reflective raw material layer, the second reflective high polymer raw material forms a second reflective raw material layer, the first reflective raw material layer and the second reflective raw material layer are alternately stacked, at the moment, the overall thickness of the initial reflective film is about 5-10 mm, and a thin film layer can be formed through subsequent stretching.
The specific materials of the first reflective polymer material and the second reflective polymer material have been described in detail above, and are not described in detail herein.
S320: and longitudinally stretching and transversely stretching the initial reflecting film to form the reflecting film.
After the initial reflection film is obtained, the initial reflection film is longitudinally stretched and transversely stretched to form a reflection film. According to the example of this application, can carry out longitudinal stretching to initial reflecting film earlier for the whole thickness attenuate of rete reaches 200 ~ 500 microns, later carries out horizontal stretching to the rete again, makes the whole thickness attenuate of rete reach 30 ~ 100 microns. Therefore, the reflecting film has proper thickness, and the first reflecting film layer and the second reflecting film layer in the reflecting film have proper thickness, so that the reflectivity of the reflecting film can be improved.
According to the examples of the present application, the longitudinal stretching and the transverse stretching of the initial reflective film may be performed under a heating condition, and as for a specific temperature condition, the present application is not particularly limited, and those skilled in the art can set the conditions according to actual needs.
By the method, a plurality of layers of reflective films can be processed at one time as long as enough die heads are designed for the die, so that hundreds of layers of reflective films with the first reflective films and the second reflective films alternately stacked can be prepared in one production process, compared with a layer-by-layer accumulation manufacturing process of optical coating, the production efficiency and the yield are greatly improved, the reflective films prepared by the multilayer co-extrusion method are not easy to wrinkle, crack or fall off, and the stability is better; meanwhile, the multilayer interference is enhanced, the higher reflectivity can be easily realized, and through testing, the reflectivity of the reflecting film prepared by the method provided by the application to the light with the wavelength of 380-780 nanometers is greater than or equal to 95%.
In yet another aspect of the present application, the present application proposes a case assembly, and referring to fig. 2 and 3, the case assembly 1000 includes a base 200 and a reflective film 100, wherein the reflective film 100 is disposed on one side of the base 200, and the reflective film 100 is the aforementioned reflective film. Therefore, the housing assembly has all the features and advantages of the reflective film described above, and will not be described herein again. Generally speaking, this casing subassembly has good outward appearance performance, and the reflectance coating among the casing subassembly is good with the base member laminating, and the reflectance coating is difficult for fracture, drops or fold, and then makes the casing subassembly have good overall stability.
According to some examples of the present application, referring to fig. 3, the housing assembly 1000 may further include a texture layer 300, a coating layer 400, and an ink layer 500, wherein the texture layer 300 is disposed on a side of the substrate 200 close to the reflective film 100, the coating layer 400 is disposed between the texture layer 300 and the reflective film 100, and the ink layer 500 is disposed on a side of the reflective film 100 away from the substrate 200. From this, when being applied to electronic equipment with casing assembly, the printing ink layer can shelter from inside component, the circuit of electronic equipment etc. and when light among the external environment shines casing assembly, the reflectance coating can be fine, can enrich the colour effect on coating film layer, also can improve the pattern texture effect on texture layer, and then improves casing assembly's external effect such as luminance and colour and pattern, makes the user experience preferred.
In another aspect of the present application, referring to fig. 4, an electronic device 2000 includes the housing assembly 1000, a display screen assembly (not shown) and a main board (not shown), the display screen assembly is connected to the housing assembly 1000, a mounting space is defined between the display screen assembly and the housing assembly 1000, and the main board is disposed in the mounting space and electrically connected to the display screen assembly. The reflective film in the housing assembly 1000 is disposed close to the installation space, and it should be noted that the reflective film disposed close to the installation space means that the reflective film in the housing assembly 1000 is disposed on a side close to the installation space with respect to the substrate 200. Thus, the electronic device has all the features and advantages of the housing assembly described above, and thus, the description thereof is omitted. Generally speaking, the shell of the electronic equipment has high reflectivity and high brightness, so that the electronic equipment has a good appearance effect.
The specific type of the electronic device 2000 described herein is not particularly limited, and may be, for example, a mobile phone, a smart watch, a palm-top computer, or a notebook computer. The electronic device may be any of various types of computer system devices that are mobile or portable and perform wireless communication. In particular, the electronic device may be a mobile or smart phone (e.g., an iPhone (TM) based phone), a Portable gaming device (e.g., Nintendo DS (TM), PlayStation Portable (TM), Gameboy Advance (TM), iPhone (TM)), a laptop, a PDA, a Portable internet device, a music player, and a data storage device, other handheld devices, and a head-mounted device such as a watch, an in-ear headphone, a pendant, a headset, etc., and other wearable devices (e.g., a head-mounted device (HMD) such as an electronic necklace, an electronic garment, an electronic bracelet, an electronic tattoo, or a smart watch).
The electronic device 2000 may also be any of a number of electronic devices including, but not limited to, cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transportation equipment, calculators, programmable remote controllers, pagers, laptop computers, desktop computers, printers, netbook computers, Personal Digital Assistants (PDAs), Portable Multimedia Players (PMPs), moving Picture experts group (MPEG-1 or MPEG-2) Audio layer 3(MP3) players, portable medical devices, and digital cameras, and combinations thereof.
In some cases, the electronic device may perform a variety of functions (e.g., playing music, displaying videos, storing pictures, and receiving and sending telephone calls). If desired, the electronic device may be a portable device such as a cellular telephone, media player, other handheld device, wristwatch device, pendant device, earpiece device, or other compact portable device.
In the description herein, references to the description of the terms "one example," "another example," "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the example is included in at least one example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more examples. Moreover, various examples and features of different examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of indicated technical features is high.
Although examples of the present application have been shown and described above, it should be understood that the above examples are not to be construed as limiting the present application and that those of ordinary skill in the art may effect alterations, modifications, substitutions and variations to the above examples without departing from the scope of the present application.

Claims (11)

1. A reflecting film is characterized by comprising a plurality of first reflecting film layers and a plurality of second reflecting film layers, wherein the first reflecting film layers and the second reflecting film layers are alternately stacked, the first reflecting film layers are formed by first reflecting high polymer raw materials, the second reflecting film layers are formed by second reflecting high polymer raw materials, and the refractive index of the first reflecting film layers is different from that of the second reflecting film layers.
2. The reflective film according to claim 1, wherein the reflective film has a reflectance of 95% or more with respect to light having a wavelength of 380 to 780 nm.
3. The film of claim 1 or 2, wherein the first plurality of reflective film layers are not all of the same thickness and the second plurality of reflective film layers are not all of the same thickness.
4. The reflective film of claim 3, wherein the first reflective film layer has a thickness of 100 to 200 nm, and the second reflective film layer has a thickness of 100 to 200 nm.
5. The reflective film according to claim 4, wherein the reflective film has a thickness of 30 to 100 μm.
6. The reflection film according to claim 5, wherein the total number of the first reflection film layer and the second reflection film layer is 100 to 500.
7. The reflective film of claim 1 or 2, wherein the first reflective polymer material comprises PET and the second reflective polymer material comprises PEN.
8. A method of making a reflective film, comprising:
providing a first reflective polymer raw material and a second reflective polymer raw material;
placing the first reflective polymeric feedstock and the second reflective polymeric feedstock in a plurality of dies;
co-extruding to obtain a reflecting film;
the reflective film comprises a plurality of first reflective film layers and a plurality of second reflective film layers, wherein the first reflective film layers and the second reflective film layers are alternately stacked, the first reflective film layers are formed by first reflective polymer raw materials, the second reflective film layers are formed by second reflective polymer raw materials, and the refractive index of the first reflective film layers is different from that of the second reflective film layers.
9. The method of claim 8, wherein the step of co-extruding the reflective film comprises:
extruding the first reflective polymer raw material and the second reflective polymer raw material from a plurality of die heads to form an initial reflective film, wherein the first reflective polymer raw material forms a first reflective raw material layer, the second reflective polymer raw material forms a second reflective raw material layer, and the first reflective raw material layer and the second reflective raw material layer are alternately stacked;
and longitudinally stretching and transversely stretching the initial reflecting film to form the reflecting film.
10. A housing assembly, comprising:
a substrate;
a reflective film provided on one side of the substrate, the reflective film being the reflective film according to any one of claims 1 to 7.
11. An electronic device, comprising:
the housing assembly of claim 10;
the display screen assembly is connected with the shell assembly, and an installation space is defined between the display screen assembly and the shell assembly, wherein a reflecting film in the shell assembly is arranged close to the installation space; and
the mainboard is arranged in the installation space and electrically connected with the display screen assembly.
CN202210140763.0A 2022-02-16 2022-02-16 Reflective film, preparation method thereof, shell assembly and electronic equipment Pending CN114509835A (en)

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