CN110370854A - Decorative membrance, housing unit and electronic equipment - Google Patents
Decorative membrance, housing unit and electronic equipment Download PDFInfo
- Publication number
- CN110370854A CN110370854A CN201910666903.6A CN201910666903A CN110370854A CN 110370854 A CN110370854 A CN 110370854A CN 201910666903 A CN201910666903 A CN 201910666903A CN 110370854 A CN110370854 A CN 110370854A
- Authority
- CN
- China
- Prior art keywords
- bearing bed
- color layers
- layer
- decorative membrance
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C5/00—Processes for producing special ornamental bodies
- B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44F—SPECIAL DESIGNS OR PICTURES
- B44F1/00—Designs or pictures characterised by special or unusual light effects
- B44F1/02—Designs or pictures characterised by special or unusual light effects produced by reflected light, e.g. matt surfaces, lustrous surfaces
- B44F1/04—Designs or pictures characterised by special or unusual light effects produced by reflected light, e.g. matt surfaces, lustrous surfaces after passage through surface layers, e.g. pictures with mirrors on the back
-
- 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
- H05K5/0243—Mechanical details of casings for decorative purposes
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a kind of decorative membrance, housing unit and electronic equipments.The decorative membrance includes bearing bed and color layers, and the material of bearing bed is thermoplastic polyurethane elastomer, and color layers are arranged on a side surface of bearing bed, and color layers are to have coloured OCA glue-line.Breakage problem when above-mentioned decorative membrance can effectively avoid diaphragm from being fitted in 3D glass.
Description
Technical field
The present invention relates to a kind of decorative membrance, housing unit and electronic equipments.
Background technique
With the arriving in 5G epoch, since the electromagnetic shielding of conventional housings influences, more and more shells use transparent material
Matter (such as glass, organic polymer etc.).Wherein, Unibody (cover board-center integration) structure is as a kind of great potential
Favor of the 3D structure by more and more manufacturer terminals.However, the appearance of shell will have a direct impact on the competition of terminal device
Power and differentiation usually fit to decorative membrance in 3D structure to improve the appearance of transparent shell, however at present
Decorative membrance when fitting in 3D structure, the decorative layer of diaphragm is easy to be broken, and seriously affects production efficiency.
Summary of the invention
Based on this, it is necessary to the decoration for the breakage problem for providing one kind when can effectively avoid diaphragm from being fitted in 3D structure
Diaphragm.
In addition, also providing a kind of housing unit and electronic equipment.
A kind of decorative membrance, including bearing bed and color layers, the material of the bearing bed are thermoplastic polyurethane elastomer,
The color layers are arranged on a side surface of the bearing bed, and the color layers are to have coloured OCA glue-line.
Through inventor the study found that since the decorative layer of current coloured PET decorative membrance is usually inorganic optical
Film, material are inorganic, metal oxide, for example, magnesium fluoride, titanium dioxide, zirconium oxide etc., are greater than 10% in stretcher strain amount
In the case where just will appear cracking phenomena substantially, and the ductility of PET and inorganic optical film is insufficient, PET decorative membrance and big
When the 3D structure fitting of angle bending, the stretcher strain amount of required carrying is 10%~30%, leads to current PET decorative membrance
The case where being broken when being bonded with the 3D structure of wide-angle bending it is easy to appear film layer, has seriously affected production efficiency.And
The material of the bearing bed of above-mentioned decorative membrance is thermoplastic polyurethane elastomer, and color layers are to have coloured OCA glue-line, thermoplastic
Property polyurethane elastomer and OCA glue-line all have preferable ductility, the energy when the 3D structure with wide-angle bending is bonded
Enough guarantee it is not broken, thus be effectively prevented from fitting during film layer fracture the problem of, therefore, above-mentioned decorative membrance can be very
It is used suitable for the 3D structural ornament of wide-angle bending well, is conducive to improve production efficiency.
A kind of housing unit, including shell and above-mentioned decorative membrance, the side far from the color layers of the bearing bed
It can be bonded with the surface of the shell.
Since the housing unit uses above-mentioned decorative membrance, so that housing unit production efficiency with higher.
A kind of electronic equipment, comprising:
Above-mentioned housing unit;
Display module is connect with the shell, and is enclosed jointly with the shell and be set as accommodating cavity;And
Circuit board is arranged in the accommodating cavity.
Due to the housing unit of above-mentioned electronic equipment production efficiency with higher so that the electronic equipment also have it is higher
Production efficiency.
Detailed description of the invention
Fig. 1 is the partial cutaway view of the decorative membrance of an embodiment;
Fig. 2 is the partial cutaway view of the decorative membrance for not having adhesive layer and release film of another embodiment;
Fig. 3 is the partial cutaway view of the decorative membrance without reflecting layer of another embodiment;
Fig. 4 is the partial cutaway view of the decorative membrance without light shield layer of another embodiment;
Fig. 5 is the partial cutaway view of the decorative membrance for not having reflecting layer and light shield layer of another embodiment;
Fig. 6 is the part of the decorative membrance for not having adhesive layer, release film, reflecting layer and light shield layer of another embodiment
Sectional view;
Fig. 7 is the structural schematic diagram of the shell of the housing unit of an embodiment;
Fig. 8 is that the partial cutaway view of the housing unit of an embodiment (draws bearing bed, the color of decorative membrance in Fig. 8
Layer and adhesive layer, for that can be considered as other layers and be omitted there are also other layers of decorative membrance);
Fig. 9 be another embodiment housing unit partial cutaway view (only drawn in Fig. 9 decorative membrance bearing bed and
Color layers, for that can be considered as other layers and be omitted there are also other layers of decorative membrance).
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more saturating
It is thorough comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
As shown in Figure 1, the decorative membrance 100 of an embodiment, which can be used in being adhered to gadget to be installed
It is above-mentioned, for decorating gadget to be installed, especially suitable for 3D structure.For example, gadget to be installed can be the shell of electronic equipment,
Wherein, electronic equipment is mobile phone, tablet computer etc., which can be adhered to shell, and (material of shell is, for example, glass
Glass, organic matter transparent substrate etc.) surface on, to have the function that decorative shell, particularly, which can be pasted
It closes on the shell for the 3D structure (such as Unibody structure) that wide-angle is bent, and will not be broken.The decorative membrance 100
Including bearing bed 110, color layers 120, adhesive layer 130, reflecting layer 140 and light shield layer 150.
The material of bearing bed 110 is thermoplastic polyurethane elastomer (TPU).TPU has preferable ductility, not easily broken
It splits.
Specifically, bearing bed 110 with a thickness of 30 microns~75 microns.If the thickness of bearing bed 110 is blocked up will lead to it is whole
The toughness of a decorative membrance 100 is insufficient, and when fitting is easy the defects of on the corner generating bubble, fold;If the thickness of bearing bed 110
Spend thin, the rigidity that will lead to bearing bed 110 is insufficient, is unfavorable for silk-screen printing and forms color layers 120 etc..
Specifically, the shore hardness of bearing bed 110 is 70A~100A.If the shore hardness of bearing bed 110 is excessive, can lead
Cause entire 100 toughness of decorative membrance insufficient, fitting process is easy the defects of on the corner generating bubble, fold;Shore hardness mistake
Low, the rigidity that will lead to bearing bed 110 is insufficient, is unfavorable for subsequent production (such as silk-screen printing) color layers on bearing bed 110
120 etc..
Color layers 120 are arranged on a side surface of bearing bed 110, and color layers 120 are to have coloured OCA
(Optically Clear Adhesive) glue-line.Color layers 120 pass through on bearing bed 110 in one of the embodiments,
The coloured OCA glue of silk-screen printing obtains.By successively printing the OCA glue containing different colours, to realize the face of color layers 120
Color change combination, or form the effect of color gradient.Usually OCA glue is transparent, and coloured OCA glue can be by OCA
Pigment is added in glue to obtain.
Since addition pigment can reduce the adhesion strength of OCA glue, the risk that falls off of color layers 120 will increase, in order to reduce face
The risk that falls off of chromatograph 120, further, the surface tension of a side surface of the close color layers 120 of bearing bed 110 reach for 38
Because more than.Wherein, surface tension herein is obtained by the way that this field is conventional up to the test of English pen.The close face of bearing bed 110
The surface tension of one side surface of chromatograph 120 can be by being controlled when making bearing bed 110 by control parameter, Huo Zhetong
It crosses and processing acquisition is modified to the surface of bearing bed 110.
In one of the embodiments, color layers 120 with a thickness of 15 microns~75 microns.It is appreciated that color layers 120
Thickness can according to need and be adjusted.
Adhesive layer 130 is arranged on the side of separate color layers 120 of bearing bed 110.Adhesive layer 130 can be by decorating film
Piece 100 is bonded together with gadget to be installed (such as shell).Wherein, adhesive layer 130 is transparent, to avoid decorative membrance is influenced
100 decorative effect.Further, adhesive layer 130 is colourless, to avoid the color effects for influencing color layers 120.
The material of adhesive layer 130 is OCA glue, hot melt adhesive, UV solidification glue etc. in one of the embodiments,.Hot melt adhesive example
It such as can be EVA resin.It should be noted that the material of adhesive layer 130 is not limited to above-mentioned material, the material of adhesive layer 130
Matter is that can be adhesively fixed with gadget to be installed and the sticking substance of the lesser tool of corrosivity, wherein due to OCA glue energy
It is enough adhered directly on gadget to be installed, without heating or action of ultraviolet light, operates more convenient.
In one of the embodiments, adhesive layer 130 with a thickness of 5 microns~20 microns, 130 energy of adhesive layer of the thickness
It is enough that more firmly decorative membrance 100 is adhered on gadget to be installed, and thinner thickness.It should be noted that adhesive layer 130
Thickness, which can according to need, to be set, as long as guaranteeing that decorative membrance 100 can be securely bonded on gadget to be installed.
Further, decorative membrance 100 further include be arranged in the separate bearing bed 110 of adhesive layer 130 side it is release
Film 160.Release film 160 can play the role of protecting adhesive layer 130, in use, directly removing release film 160.From
Type film 160 can be PET film piece etc..It is appreciated that release film 160 also can be omitted, it at this time can be raw by decorative membrance 100
It is adhered directly to after output on gadget to be installed.
The side of the separate bearing bed 110 of color layers 120 is arranged in reflecting layer 140.Since color layers 120 are with color
OCA glue-line, the more traditional PVD optical layer for having color effects of the glossiness of OCA glue-line is low, and reflecting layer 140 can play
The effect of blast is reflected, to increase the glossiness of color layers 120.
Wherein, the material in reflecting layer 140 is metal.Since the toughness of inorganic oxide layer is poor, it is disconnected to be easy to appear stretching
The problem of splitting just will appear cracking phenomena in the case where stretcher strain is greater than 10% substantially, and the material in above-mentioned reflecting layer 140
Tensile ductility for metal, metal is preferable, can be effectively prevented from cracking breakage problem.It is anti-in one of the embodiments,
Layer 140 is penetrated to obtain by PVD (physical vapour deposition (PVD)).
The material in reflecting layer 140 is indium or tin in one of the embodiments, and indium and tin hardly have shielding to electromagnetism
Effect, so that above-mentioned decorative membrance 100 can be used in decorating handset shell.It should be noted that if decorative membrance 100 is applied
In other communication fields, the material in reflecting layer 140 is not limited to indium and tin, as long as the metal that can play reflection blast is equal
It can.
In one of the embodiments, reflecting layer 140 with a thickness of 10 microns~50 microns.It is appreciated that reflecting layer 140
Thickness can be adjusted according to the variation of required glossiness.
The side of the separate color layers 120 in reflecting layer 140 is arranged in light shield layer 150, and light shield layer 150 can be used not only for preventing
Light penetrates, additionally it is possible to highlight the color effects of color layers 120, and light shield layer 150 can also play the work in protection reflecting layer 140
With.Light shield layer 150 and reflecting layer 140 collectively form functional layer.
Specifically, the material of light shield layer 150 is white ink or black ink.Black ink and white ink have preferable
Shaded effect.
In one of the embodiments, light shield layer 150 with a thickness of 5 microns~30 microns.It is appreciated that light shield layer 150
Thickness can be adjusted according to the variation of required glossiness.
Above-mentioned decorative membrance 100 at least has the advantage that
(1) through inventor the study found that since the decorative layer of current coloured PET decorative membrance is usually inorganic light
Film is learned, material is inorganic, metal oxide, for example, magnesium fluoride, titanium dioxide, zirconium oxide etc., are greater than in stretcher strain amount
It just will appear cracking phenomena in the case where 10% substantially, and the ductility of PET and inorganic optical film is insufficient, PET decorative membrance
When being bonded with the 3D structure of wide-angle bending, the stretcher strain amount of required carrying is 10%~30%, and current PET is caused to decorate
The case where being broken when diaphragm is bonded with the 3D structure of wide-angle bending it is easy to appear film layer has seriously affected production effect
Rate.And the material of the bearing bed 110 of above-mentioned decorative membrance 100 is thermoplastic polyurethane elastomer, color layers 120 are with color
OCA glue-line, thermoplastic polyurethane elastomer and OCA glue-line all have preferable ductility, with the 3D of wide-angle bending knot
Structure can guarantee when being bonded it is not broken, thus be effectively prevented from fitting during film layer fracture the problem of, it is therefore, above-mentioned
The 3D structural ornament that decorative membrance 100 can be perfectly suitable for wide-angle bending uses, and is conducive to improve production efficiency.
(2) by setting reflecting layer 140, the material in reflecting layer 140 uses metal, and also there is metal preferable stretch to extend
Property, i.e. setting reflecting layer 140 can not only play the effect of reflection blast, promote the glossiness of color layers 120, additionally it is possible to very well
The 3D structure that ground is suitable for wide-angle bending, which is bonded, to be used.
(3) above-mentioned decorative membrance 100 passes through the parameter for rationally controlling each layer, so that above-mentioned decorative membrance 100 has preferably
Toughness, can effectively avoid above-mentioned decorative membrance 100 3D structure fitting when on the corner generate bubble, fold the defects of
Problem;Meanwhile the parameter by the way that bearing bed 110 is rationally arranged, it can not only make decorative membrance 100 that there is preferable toughness, and
And it also can be realized the production and firm setting of color layers 120.
It should be noted that above-mentioned decorative membrance 100 is not limited to above structure, and in other embodiments, adhesive layer 130
Can be omitted, at this point, decorative membrance 100 is without release film 160, the structure of decorative membrance 100 at this time as shown in Fig. 2,
The side of the separate color layers 120 of the bearing bed 110 of decorating film and gadget to be installed are pasted in use, reusing transparent binder
Conjunction;Alternatively, at least one of reflecting layer 140 and light shield layer 150 also can be omitted, and when reflecting layer 140 is omitted, shading
The side of the separate bearing bed 110 of color layers 120 is arranged in layer 150, at this point, decorative membrance 100 does not have reflecting layer 140, function
Layer is light shield layer 150 (structure of decorative membrance 100 at this time is as shown in Figure 3);When light shield layer 150 omits, decorative membrance 100
Without shaded effect, reflecting layer 140 is functional layer (structure of decorative membrance 100 at this time is as shown in Figure 4);Work as reflecting layer
140 and light shield layer 150 omit, decorative membrance 100 do not have reflecting layer 140 and the (decorative membrance 100 at this time of light shield layer 150
Structure it is as shown in Figure 5).Alternatively, adhesive layer 130, release film 160, reflecting layer 140 and light shield layer 150 omit simultaneously, at this point,
The structure of decorative membrance 100 is as shown in Figure 6;Alternatively, adhesive layer 130 and release film 160 with reflecting layer 140 and light shield layer 150
In one omit simultaneously.
Also referring to shown in Fig. 1~8, the housing unit of an embodiment, including shell 200 and any of the above-described kind of decoration
Diaphragm 100.The side of the separate color layers 120 of bearing bed 110 can be bonded with the surface of shell 200.For with adhesive layer
130 decorative membrance 100, the adhesive layer 130 being arranged on bearing bed 110 can be bonded with shell 200.When decorative membrance 100
When with release film 160, release film 160 is torn off, then adhesive layer 130 and shell 200 are bonded.
Decorative membrance 100 for not having adhesive layer 130 makes when fitting to decorative membrance 100 on shell 200
Side and the bonding of shell 200 with adhesive glue 300 by bearing bed 110 far from color layers 120 can (at this time as shown in Figure 9).
Shell 200 is transparent substrate in one of the embodiments,.Specifically, shell 200 is glass substrate or organic matter
Substrate.Wherein, glass substrate can be for higher-strength and the preferable glass of translucency, such as alumina silicate glass;It is organic
Object substrate is, for example, pet substrate or PC/PMMA composite plate ("/" expression stratiform) etc..Transparent substrate can be tabular, can also be with
For 3D structure.
In one of the embodiments, shell 200 be 3D transparent panel, shell 200 have concave surface 210 and with indent table
The opposite convex surface 220 in face 210.It the side of the separate color layers 120 of bearing bed 110 can be with the concave surface of shell 200
210 fittings.I.e. adhesive layer 130 is bonded with the concave surface 210 of shell 200.
Since the housing unit uses above-mentioned decorative membrance 100, so that housing unit production efficiency with higher.
The electronic equipment of one embodiment, including housing unit, display module and circuit board.Wherein, housing unit is upper
State housing unit.Display module is connect with shell 200, and is enclosed jointly with shell 200 and be set as accommodating cavity.Circuit board setting is accommodating
It is intracavitary.Due to the housing unit of above-mentioned electronic equipment production efficiency with higher, so that the electronic equipment is also with higher
Production efficiency.
It should be noted that above-mentioned decorative membrance 100 is not limited to use in the shell of decoration electronic equipment, it may also be used for other
The field etc. for needing pad pasting to decorate.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of decorative membrance, which is characterized in that including bearing bed and color layers, the material of the bearing bed is thermoplastic poly ammonia
Ester elastomer, the color layers are arranged on a side surface of the bearing bed, and the color layers are to have coloured OCA glue
Layer.
2. decorative membrance according to claim 1, which is characterized in that the bearing bed it is micro- with a thickness of 30 microns~75
Rice;
And/or the hardness of the bearing bed is 70A~100A;
And/or the surface tension of the side surface close to the color layers of the bearing bed is 38 dynes or more.
3. decorative membrance according to claim 1, which is characterized in that further include the separate face that the bearing bed is arranged
The transparent adhesive layer of the side of chromatograph.
4. decorative membrance according to claim 3, which is characterized in that the material of the adhesive layer is OCA, hot melt adhesive or UV
Solidification glue.
5. decorative membrance according to any one of claims 1 to 4, which is characterized in that further include being arranged in the color layers
Far from the bearing bed side functional layer, the functional layer be selected from least one of reflecting layer and light shield layer, it is described
The material in reflecting layer is metal.
6. decorative membrance according to claim 5, which is characterized in that the functional layer includes reflecting layer and light shield layer, institute
The side far from the bearing bed that the color layers are arranged in reflecting layer is stated, the remote of the reflecting layer is arranged in the light shield layer
Side from institute's color layers.
7. decorative membrance according to claim 5, which is characterized in that the material in the reflecting layer is indium or tin.
8. a kind of housing unit, which is characterized in that described including shell and the described in any item decorative membrances of claim 1~7
The side far from the color layers of bearing bed can be bonded with the surface of the shell.
9. housing unit according to claim 8, which is characterized in that the shell is 3D transparent panel, and the shell has interior
The side far from the color layers of concave surface, the bearing bed can be bonded with the concave surface.
10. a kind of electronic equipment characterized by comprising
The described in any item housing units of claim 8~9;
Display module is connect with the shell, and is enclosed jointly with the shell and be set as accommodating cavity;And
Circuit board is arranged in the accommodating cavity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201910666903.6A CN110370854A (en) | 2019-07-23 | 2019-07-23 | Decorative membrance, housing unit and electronic equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201910666903.6A CN110370854A (en) | 2019-07-23 | 2019-07-23 | Decorative membrance, housing unit and electronic equipment |
Publications (1)
Publication Number | Publication Date |
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CN110370854A true CN110370854A (en) | 2019-10-25 |
Family
ID=68255099
Family Applications (1)
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CN201910666903.6A Pending CN110370854A (en) | 2019-07-23 | 2019-07-23 | Decorative membrance, housing unit and electronic equipment |
Country Status (1)
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Citations (6)
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CN102069674A (en) * | 2009-11-25 | 2011-05-25 | 锣洋科技股份有限公司 | Decorative film, manufacture method for decorative film and manufacture method for additional decorative forming subject |
US20110177295A1 (en) * | 2010-01-20 | 2011-07-21 | Wang Ching-Tu | Finished product structure formed by in-mold decoration process |
EP3243652A1 (en) * | 2016-05-11 | 2017-11-15 | Covestro Deutschland AG | Thermoplastic carrier/glass composite |
CN207099468U (en) * | 2017-02-28 | 2018-03-13 | 比亚迪股份有限公司 | A kind of otpical leaf and casting of electronic device |
CN109927471A (en) * | 2019-04-04 | 2019-06-25 | Oppo广东移动通信有限公司 | Casting of electronic device and preparation method thereof and electronic equipment |
CN109996409A (en) * | 2019-04-04 | 2019-07-09 | Oppo广东移动通信有限公司 | The manufacturing method of the shell of electronic device, electronic device and shell |
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2019
- 2019-07-23 CN CN201910666903.6A patent/CN110370854A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102069674A (en) * | 2009-11-25 | 2011-05-25 | 锣洋科技股份有限公司 | Decorative film, manufacture method for decorative film and manufacture method for additional decorative forming subject |
US20110177295A1 (en) * | 2010-01-20 | 2011-07-21 | Wang Ching-Tu | Finished product structure formed by in-mold decoration process |
EP3243652A1 (en) * | 2016-05-11 | 2017-11-15 | Covestro Deutschland AG | Thermoplastic carrier/glass composite |
CN207099468U (en) * | 2017-02-28 | 2018-03-13 | 比亚迪股份有限公司 | A kind of otpical leaf and casting of electronic device |
CN109927471A (en) * | 2019-04-04 | 2019-06-25 | Oppo广东移动通信有限公司 | Casting of electronic device and preparation method thereof and electronic equipment |
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Application publication date: 20191025 |