TW201941940A - Structure, decorative film, and decorative film manufacturing method - Google Patents

Abstract

To provide: a structure that has a metallic appearance, has excellent design properties, and is capable of transmitting electric waves; a decorative film; and a decorative film manufacturing method. The present technology pertains to a structure provided with a decorative part and a member. The decorative part includes an insulating metal layer and a hue adjustment layer which is adjacent to a design surface side of the insulating metal layer, has light transmissivity in the visible light region, and causes interference in the reflected light from the insulating metal layer. The member has a decorated region to which the decorative part is adhered.

Description

Structure, decorative film and manufacturing method of decorative film

The present invention relates to a structure, a decorative film, and a method for manufacturing a decorative film that can be applied to electronic equipment or vehicles.

Previously, as a housing part of an electronic device, a member having a metallic appearance but capable of transmitting electric waves was created. For example, Patent Document 1 discloses an optical multilayer film that alternately laminates a high-refractive index film containing an inorganic material and a low-refractive index film, and has specific filter characteristics. Since no metal is used in the optical multilayer film, radio waves can be transmitted.

Further, Patent Documents 2 and 3 disclose films in which a plurality of resin layers having different refractive indices are laminated alternately to selectively reflect light of a specific wavelength. Since no metal is used in this film, radio waves are transmitted.

Further, Patent Document 4 discloses a molded article in which a transparent aluminum nitride layer having an interference color is laminated on a titanium nitride layer having a metallic color. May have the appearance of metallic and rainbow interference colors.

In addition, Patent Document 5 discloses a molded article including a bright decorative layer containing tin and / or a tin alloy. By constructing the bright decorative layer in multiple layers, it can have the appearance of interference colors that are metallic and iridescent.

Further, Patent Document 6 discloses a coating composition for forming a coating film. When a metal deposited film such as tin or indium is formed on the coating film, an iris pattern can be developed.

Further, Patent Document 7 discloses a door opening and closing device in which a metal thin film layer is laminated on an inorganic thin film layer. The metal particles forming the metal thin film layer form separate island-shaped aggregates on the inorganic thin film layer, which can achieve the beauty and insulation of metallic luster.
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2005-126813
[Patent Document 2] Japanese Unexamined Patent Publication No. 3-14041
[Patent Document 3] Japanese Patent Laid-Open No. 2009-262466
[Patent Document 4] Japanese Patent Laid-Open No. 2005-55329
[Patent Document 5] Japanese Patent Laid-Open No. 2005-212745
[Patent Document 6] Japanese Patent Laid-Open No. 2013-241583
[Patent Document 7] Japanese Patent Laid-Open No. 2012-225041

[Problems to be solved by the invention]

However, in the optical multilayer film described in Reference 1, it is necessary to laminate 20 or more layers in order to obtain desired optical characteristics, and there is a problem in production efficiency. Further, in the films described in Patent Documents 2 and 3, it is necessary to laminate 50 or more layers in order to obtain gloss of metallic texture, and there is a problem in production efficiency. In addition, the resin layer may be deteriorated due to the influence of ultraviolet rays, and the resin layer may be locally deformed during molding, and the color unevenness may be caused due to a change in film thickness.

Moreover, in the molded article described in the cited reference 4, after the metal is vapor-deposited, the metal is nitrided, oxidized, or carbonized, but is not completely nitrided, oxidized, or carbonized, and a part remains as a metal, so It becomes a complete insulating film. Therefore, compared with the case where there is no vapor-deposited film, radio wave transmittance is reduced.

Moreover, in the molded article described in the reference 5, since the bright decorative layer contains tin and / or a tin alloy, the reflectance is lower than that of aluminum, and the brightness is lacking. In addition, if the bright decorative layer is thickened, insulation properties are lost, and radio wave transmittance is reduced.

Moreover, in the coating composition described in the cited reference 6, since a metal vapor-deposited film is not limited to tin or indium, it has a lower reflectance than aluminum and lacks gloss.

In view of the foregoing, an object of the present invention is to provide a structure, a decorative film, a method of manufacturing a structure, and a method of manufacturing a decorative film that have a metallic appearance but have high designability for transmitting radio waves.
[Technical means to solve the problem]

To achieve the above object, a structure according to an aspect of the present invention includes a decorative portion and a member.
The decorative portion includes: an insulating metal layer; and a color adjustment layer, which is adjacent to the design surface side of the insulating metal layer, and has translucency in a visible light region, and generates reflected light generated by the insulating metal layer. put one's oar in.
The member has a decorated area to which the decorative portion is attached.

According to this configuration, light incident from the design surface side is reflected by the insulating metal layer, and the color is adjusted by interference caused by the color adjustment layer. In addition, since the insulating metal layer does not shield the radio waves, it is possible to realize a structure having a high design property that allows radio waves to pass though it has a metallic appearance.

The insulating metal layer may be one having fine cracks.

By providing fine cracks, the surface resistance value of the insulating metal layer is substantially insulated, preventing eddy currents from occurring when radio waves pass through the insulating metal layer. Thereby, the reduction of the energy of the electromagnetic wave due to the eddy current loss is sufficiently suppressed, and the radio wave transmits through the insulating metal layer with a high transmittance.

The insulating metal layer may include any one of aluminum, titanium, chromium, silver, and an alloy containing at least one of them.

Metal films of aluminum, titanium, chromium, silver, and alloys containing them have higher light reflectivity but shield radio waves. Therefore, by providing fine cracks in the metal film to form an insulating metal layer, it is possible to form a layer that transmits radio waves while having a high light reflectance.

The insulating metal layer may be a discontinuous film of metal.

A specific metal is formed into a film having a thickness equal to or less than a predetermined film thickness to form a metal discontinuous film, thereby forming an insulating metal layer. In this case, instead of providing fine cracks, a layer that transmits radio waves may be used.

The insulating metal layer may include any one of indium, tin, and an alloy containing at least one of them.

Since a metal discontinuous film is formed by forming a film with a thickness of a predetermined film thickness or less by using indium, tin, and an alloy thereof, it can be used as an insulating metal layer.

The color adjustment layer may include silicon, silicon oxide, silicon nitride, metal oxide, or metal nitride.

Silicon, silicon oxide, silicon nitride, metal oxide, or metal nitride can be used as a color adjustment layer because it interferes with the reflected light generated by the insulating metal layer.

The color adjustment layer may have a Mohs hardness higher than that of the insulating metal layer.

By making the Mohs hardness of the color adjustment layer higher than the Mohs hardness of the insulating metal layer, even if the breaking strength of the color adjustment layer is smaller than that of the insulating metal layer, the color adjustment layer is broken first, which can be used as induced insulation. The crack-inducing layer of the crack of the flexible metal layer functions.

The thickness of the color adjustment layer may be 10 nm to 300 nm.

If the thickness of the color adjustment layer is less than 10 nm, interference due to the color adjustment layer is unlikely to occur, and if it exceeds 300 nm, the light transmittance becomes small. Therefore, the thickness of the color adjustment layer is preferably 10 nm to 300 nm.

The thickness of the insulating metal layer may be 10 nm to 300 nm.

If the thickness of the insulating metal layer is less than 10 nm, incident light is transmitted, so the light reflectance is reduced. If it exceeds 300 nm, the surface is rough, and the light reflectance is reduced. Therefore, the thickness of the insulating metal layer is preferably 10 nm to 300 nm.

The long side of the cracked sheet of the insulating metal layer may be 1 μm or more and 500 μm or less.

If the long side of the cracked sheet is less than 1 μm, the area ratio of the cracked sheet to the fine cracks will be reduced, and the light reflectance will be reduced. If the long side of the cracked sheet exceeds 500 μm, the radio wave transmission will be reduced, so the insulating metal layer The long side of the cracked sheet is preferably 1 μm to 500 μm.

The structure may further include an adhesive layer for fixing the crack sheet of the insulating metal layer.

The adhesive sheet is used to fix the cracked sheet of the insulating metal layer, thereby preventing the cracked sheet from peeling.

The structure may be at least a part of a housing part, a vehicle, or a building.

By applying the present invention, it is possible to realize housing parts, vehicles, and buildings that have a metallic appearance but have high designability for transmitting radio waves.

To achieve the above object, a decorative film according to an aspect of the present invention includes a base film, an insulating metal layer, and a color adjustment layer.
The color adjustment layer is adjacent to a design surface side of the insulating metal layer, and has a light transmitting property in a visible light region, and interferes with reflected light generated by the insulating metal layer.

The insulating metal layer may be one having fine cracks.

In order to achieve the above object, a method for manufacturing a decorative film according to one aspect of the present invention forms a laminated film including: a base film; a metal layer; and a color adjustment layer having a Mohs hardness higher than that of the metal layer, and The metal layers are adjacent to each other and have translucency in the visible light region, which interferes with the reflected light generated by the insulating metal layer; and extends the laminated film to cause fine cracks in the metal layer and the color adjustment layer, and The above-mentioned metal layer is an insulating metal layer.
[Effect of the invention]

As described above, according to the present invention, it is possible to provide a structure, a decorative film, a method of manufacturing a structure, and a method of manufacturing a decorative film that have a metallic appearance but have high designability for transmitting radio waves. It is not necessarily limited to the effects described here, and any of the effects described in the present invention may be the effects of the present invention.

(First Embodiment)
A first embodiment of the present invention will be described.

[Composition of electronic equipment]
FIG. 1 is a schematic diagram showing a configuration example of a mobile terminal as an electronic device according to an embodiment of the present invention. FIG. 1A is a front view showing the front side of the mobile terminal 100, and FIG. 1B is a perspective view showing the back side of the mobile terminal 100.

The mobile terminal 100 includes a casing portion 101 and electronic components (not shown) housed in the casing portion 101. As shown in FIG. 1A, on the front surface side, that is, the front surface portion 102, of the housing portion 101 are provided: a talking portion 103, a touch panel 104, and an opposite camera 105. The communication unit 103 is provided for communicating with a telephone partner, and includes a speaker unit 106 and a voice input unit 107. The speaker's voice is output from the speaker unit 106, and the user's voice is transmitted to the counterpart via the voice input unit 107.

Various images or a GUI (Graphical User Interface) are displayed on the touch panel 104. The user can view still pictures or animations through the touch panel 104. And, the user inputs various touch operations via the touch panel 104. The opposite camera 105 is used when photographing a user's face or the like. The specific configuration of each device is not limited.

As shown in FIG. 1B, a metal decorative portion 10 that is decorated so as to have a metallic appearance is provided on the rear surface side 108 of the housing portion 101. Although the metallic decorative portion 10 has a metallic appearance, it can transmit radio waves.

As will be described in detail later, a to-be-decorated region 11 is formed in a predetermined region of the back surface portion 108. A metal decorative portion 10 is formed by adhering a decorative film 12 to the decorated region 11. Therefore, the to-be-decorated region 11 corresponds to a region where the metal decorative portion 10 is formed.

In this embodiment, the decorative film 12 corresponds to a decorative portion. The housing portion 101 for forming the decorated area 11 corresponds to a member. The structure body of the present invention is constituted as a housing part by the case portion 101 having the decorated area 11 and the decoration film 12 attached to the decorated area 11. In addition, the structure of the present invention may be used in a part of a housing part.

In the example shown in FIG. 1B, the metal decorative portion 10 is partially formed in the approximate center of the back surface portion 108. The position for forming the metal decorative portion 10 is not limited, and can be appropriately set. For example, the metal decorative portion 10 may be formed on the entire back surface portion 108. Thereby, the entire back surface portion 108 can have a metallic appearance uniformly.

By making the other parts around the metallic decorative portion 10 substantially the same appearance as the metallic decorative portion 10, the entire back surface portion 108 can be made uniform in the metallic appearance. In addition, by designing other parts such as the wood grain texture other than the metal decorative portion 10, the design can be improved. It is only necessary to appropriately set the position or size of the metal decorative portion 10, and the appearance of other parts so as to exert the design desired by the user.

Next, the decorative film 12 on the decorated area 11 has a design surface 12a. The design surface 12 a is a surface that is visually recognized by a user using the mobile terminal 100, and is a surface that becomes one of the elements constituting the appearance (design) of the housing portion 101. In this embodiment, the surface facing the front side of the back surface portion 108 is the design surface 12 a of the decorative film 12. That is, the surface opposite to the adhering surface 12b (see FIG. 2) adjoining the decorated area 11 is the design surface 12a.

As the electronic component housed in the housing portion 101, in this embodiment, an antenna portion 15 (see FIG. 2) which can communicate with an external reader / writer via radio waves is housed. The antenna unit 15 includes, for example, a base substrate (not shown), an antenna coil 16 (see FIG. 2) formed on the base substrate, and a signal processing circuit unit (not shown) electrically connected to the antenna coil 16. The specific configuration of the antenna section 15 is not limited. In addition, as the electronic components accommodated in the housing portion 101, various electronic components such as an IC chip and a capacitor are accommodated.

[Composition of Metal Decoration Department]
FIG. 2 is a schematic cross-sectional view showing the configuration of the metal decorative portion 10. As described above, the metallic decorative portion 10 is composed of the decorated area 11 formed in an area corresponding to the position of the antenna portion 15 and the like, and the decorative film 12 next to the decorated area 11.

The decorative film 12 includes an adhesive layer 121, an insulating metal layer 122, a color adjustment layer 123, an easy-adhesion layer 124, and a protective layer 125.

The adhering layer 121 attaches the decorative film 12 to the decorated area 11. The material of the adhesion layer 121 is not particularly limited, and for example, a thermoplastic resin can be used. In addition, as described later, a crack is provided in the insulating metal layer 122 and the color adjustment layer 123, and then the layer 121 enters the inside of the crack, and also functions as a fixed layer for fixing the crack sheet of the insulating metal layer 122 and the color adjustment layer 123. Features.

The insulating metal layer 122 is a layer for setting the metallic decorative portion 10 to have a metallic appearance. A plurality of fine cracks (hereinafter referred to as fine cracks) 122 a are formed in the insulating metal layer 122. FIG. 3 is a view in which the insulating metal layer 122 is viewed from a direction perpendicular to the layer direction.

As shown in the figure, the insulating metal layer 122 is divided into a plurality of crack pieces 122 b by the fine cracks 122 a. Thereby, the surface resistance value of the insulating metal layer 122 is substantially insulated, and eddy current is prevented from being generated in the insulating metal layer 122 when radio waves pass through the decorative film 12. As a result, the reduction in the energy of the electromagnetic wave due to the eddy current loss is sufficiently suppressed, and the radio wave is transmitted through the decorative film 12 with a high transmittance.

In addition, the shape of the crack piece 122b is not limited to the shape shown in FIG. 3, and may be a shape with higher randomness.

The material of the insulating metal layer 122 is a material having a high light reflectance, and any one of aluminum, titanium, chromium, and silver, or an alloy including at least one of aluminum, titanium, chromium, and silver may be used.

The thickness of the insulating metal layer 122 is preferably 10 nm to 300 nm. This is because if the thickness of the insulating metal layer 122 is less than 10 nm, incident light passes through the insulating metal layer 122 and the light reflectance decreases. If the thickness of the insulating metal layer 122 exceeds 300 nm, the surface of the insulating metal layer 122 Roughness and reduced light reflectivity.

The color adjustment layer 123 is adjacent to the design surface 12a side of the insulating metal layer 122, and has transparency in the visible light region, and interferes with the reflected light generated by the insulating metal layer 122. Thereby, the color of the metal decorative portion 10 can be adjusted by the structural color formed by the interference.

The color adjustment layer 123 can be a single-layer film. If the insulating metal layer 122 is not provided, in order to provide the metallic decoration portion 10 with a metallic texture, it is necessary to set the color adjustment layer 123 to have a plurality of layers to increase the reflectance. On the other hand, since the decorative film 12 includes the insulating metal layer 122, even if the color adjustment layer 123 is a single-layer film, high reflectance and color can be taken into consideration.

The material of the color adjustment layer 123 is only required to be transparent in the visible light region and to interfere with the reflected light generated by the insulating metal layer 122. Silicon, silicon oxide, silicon nitride, and metal oxide may be used. Or metal nitrides.

As the metal oxide, cobalt oxide (Co ₃ O ₄ ), aluminum oxide (Al ₂ O ₃ ), iron oxide (Fe ₂ O ₃ ), chromium oxide (Cr ₂ O ₃ ), and cerium oxide (CeO _{2) can be used.} ), Zirconia (ZrO ₂ ), titanium oxide (TiO ₂ ), or magnesium oxide (MgO).

Examples of the metal nitride include boron nitride (BN) and titanium nitride (TiN).

In addition, fine cracks (hereinafter referred to as fine cracks) 123 a are formed in the color adjustment layer 123. As shown in FIG. 2, the micro-crack 123 a is a crack connected to the micro-crack 122 a provided in the insulating metal layer 122.

By setting the color adjustment layer 123 to be a layer having a tensile fracture strength lower than that of the insulating metal layer 122, fine cracks 123a are generated in the color adjustment layer 123 in the manufacturing process of the decorative film 12. Using this fine crack 123a as a starting point, the fine crack 122a can be induced in the insulating metal layer 122. That is, the color adjustment layer 123 can also function as a crack-inducing layer.

In order to make the tensile fracture strength of the color adjustment layer 123 smaller than that of the insulating metal layer 122, the Mohs hardness of the color adjustment layer 123 may be higher than that of the insulating metal layer 122. The Mohs hardness of various materials is shown below.

Aluminum (Al): Mohs hardness is about 2.5
Chromium (Cr): Mohs hardness is about 9
Silicon (Si): Mohs hardness of about 7
Titanium (Ti): Mohs hardness is about 6
Cobalt (Co): Mohs hardness is about 5.5
Iron (Fe): Mohs hardness is about 4.5
Nickel (Ni): Mohs hardness is about 3.5
Alumina (Al ₂ O ₃ ): Mohs hardness about 9
Iron oxide (Fe ₂ O ₃ ): Mohs hardness is about 6
Chromium oxide (Cr ₂ O ₃ ): Mohs hardness is about 6
Cerium oxide (CeO ₂ ): Mohs hardness of about 6
Zirconia (ZrO ₂ ): Mohs hardness is about 6
Titanium oxide (TiO ₂ ): Mohs hardness is about 5.5
Silicon oxide (SiO ₂ ): Mohs hardness is about 7
Magnesium oxide (MgO): Mohs hardness is about 6.5
Boron nitride (BN): Mohs hardness about 9
Titanium nitride (TiN): Mohs hardness about 9
Silicon Carbide (SiC): Mohs hardness of about 9.5
Boron carbide (B ₄ C): Mohs hardness is about 9

Based on the Mohs hardness, for example, when the insulating metal layer 122 includes aluminum, the color adjustment layer 123 may include aluminum oxide, iron oxide, chromium oxide, cerium oxide, zirconia, titanium oxide, silicon oxide, magnesium oxide, Boron nitride, titanium nitride, silicon carbide, or boron carbide.

When the insulating metal layer 122 includes titanium, for example, the color adjustment layer 123 may include aluminum oxide, silicon oxide, magnesium oxide, boron nitride, titanium nitride, silicon carbide, or boron carbide.

When the insulating metal layer 122 includes chromium, for example, the color adjustment layer 123 may include silicon carbide.

In addition, the color adjustment layer 123 may not be used as a crack-inducing layer, and the color adjustment layer 123 may be one without micro-cracks 123a. At this time, the Mohs hardness of the color adjustment layer 123 may be smaller than the Mohs hardness of the insulating metal layer 122.

The thickness of the color adjustment layer 123 is preferably 10 nm to 300 nm. This is because interference is less likely to occur when the thickness of the color adjustment layer 123 is less than 10 nm, and light transmittance of the color adjustment layer 123 becomes small when the thickness of the color adjustment layer 123 exceeds 300 nm. In addition, the color adjustment layer 123 can achieve color adjustment of each color at a thickness of 300 nm or less, without having to set a thickness exceeding 300 nm.

In addition, the thickness and material composition (oxidation degree, etc.) of the color adjustment layer 123 may be non-uniform in the surface of the color adjustment layer 123, and may also be set to show a rainbow color by adjusting the thickness or material composition distribution in the surface By.

The easy-adhesion layer 124 is a layer in which the protective layer 125 is adhered to the color adjustment layer 123. The easily-adhesive layer 124 only needs to have adhesiveness and translucency.

The protective layer 125 is a layer (hard coat layer) that protects each layer of the decorative film 12. The protective layer 125 is only required to have a light-transmitting property, and a material including a UV-curable resin, a thermosetting resin, or a two-liquid-solid resin can be used. The protective layer 125 realizes smoothing, antifouling, peeling prevention, and damage prevention. The protective layer 125 may be coated with an acrylic resin or the like. In addition, by selecting a non-vinyl chloride-based material as the protective layer 125, it is helpful to prevent metal corrosion.

The surface of the protective layer 125, that is, the surface opposite to the easy-adhesion layer 124 is the design surface 12 a of the decorative film 12. Further, a printed layer or the like may be formed on the design surface 12a or the lower surface of the protective layer 125.

The metal decorative portion 10 has the structure described above. As described above, as the metal decorative portion 10, a decorative film may be transferred to the decorative portion 11 of the case portion 101. The following describes the decorative film for transfer.

[Configuration of decorative film for transfer]
FIG. 4 is a schematic cross-sectional view showing the structure of the decorative film 150 for transfer. In the structure of the decoration film 150, the same code | symbol is attached | subjected to the structure similar to the said decoration film 12, and the description is abbreviate | omitted.

As shown in the figure, the decorative film 150 includes an adhesive layer 121, an insulating metal layer 122, a color adjustment layer 123, an easy-adhesion layer 124, a protective layer 125, a release layer 151, and a base film 152.

The release layer 151 is a layer laminated on the protective layer 125, and then the protective layer 125 and the base film 152. The release layer 151 includes an adhesive material having a relatively small adhesive force.

The base film 152 is a layer that becomes a support for each layer of the decorative film 150. The base film 152 typically uses a resin film. As the material of the base film 152, for example, PET (polyethylene terephthalate), PC (polycarbonate), PMMA (poly (methyl methacrylate)), or PP (polypropylene) is used. Other materials available.

The decoration film 150 has the structure described above. The decorative film 150 is attached to the area to be decorated 11 through the adhesive layer 121. When the release layer 151 and the base film 152 are peeled off, the metal decorative portion 10 shown in FIG. 2 is formed.

[About the effect of the metal decoration department]
In the metal decorative portion 10, as described above, incident light is reflected by the insulating metal layer 122, and the reflected light is adjusted in color by interference caused by the color adjustment layer 123.

The insulating metal layer 122 is insulated in the layer direction by the micro-cracks 122a to prevent transmission of radio waves. Therefore, as the material of the insulating metal layer 122, generally, a material having conductivity can be used, and a metal having a high light reflectance such as aluminum can be used.

Figure 5 is a graph showing the reflectance wavelength dispersion of aluminum (60 nm thickness) and tin (60 nm thickness). As shown in the figure, aluminum has a high light reflectance in a wide wavelength band.

For the color adjustment performed by the color adjustment layer 123, FIG. 6 is a diagram showing a single layer of silicon and the reflectance wavelength dispersion, and FIG. 7 is a table showing the color of reflected light. As shown in the figure, the reflectance of silicon varies for each wavelength depending on the thickness, and the color of the reflected light changes to each color. On the other hand, the maximum light reflectivity of silicon is 60% or less.

FIG. 8 is a graph showing the reflectance wavelength dispersion of a laminated body in which a single layer of silicon is laminated on aluminum having a thickness of 60 nm, and FIG. 9 is a table showing the color of reflected light. As shown in the figure, if silicon is laminated on aluminum, the light reflectance is increased by the higher light reflectance of aluminum. In addition, a change in the color of the reflected light due to the thickness of the silicon also occurs.

FIG. 10 is a graph showing the reflectance wavelength dispersion of a laminated body having a single layer of SiO _x (oxidation degree 0.2) laminated on aluminum having a thickness of 60 nm, and FIG. 11 is a table showing the color of reflected light. FIG. 12 is a graph showing the reflectance wavelength dispersion of a laminated body having a single layer of SiO _x (degree of oxidation 0.5) laminated on aluminum having a thickness of 60 nm, and FIG. 13 is a table showing the color of reflected light.

As shown in FIGS. 10 to 13, the reflectance wavelength dispersion also changes due to the oxidation degree of SiO _x , and the color can be adjusted while achieving a higher light reflectance.

In this way, in the metal decorative portion 10, the high light reflectance formed by the insulating metal layer 122 and the color adjustment by the color adjustment layer 123 can be realized, and the appearance of having a metallic texture while having radio wave transmission can be achieved. The design is a high structure.

[Manufacturing method of decorative film]
The manufacturing method of the decoration film 150 is demonstrated. In the manufacturing method of the decorative film 150, first, a laminated film is prepared. FIG. 14 is a schematic diagram showing the constitution of the laminated film 160. As shown in the figure, a laminated film 160 is formed by laminating the adhesive layer 121, the metal layer 161, the color adjustment layer 162, the easy-adhesive layer 124, the protective layer 125, the release layer 151, and the base film 152.

The manufacturing method of the laminated film 160 is not particularly limited, and the color adjustment layer 162 and the metal layer 161 can be formed by a roll-to-roll or batch-type evaporation process.

Then, the laminated film 160 is extended, and tension is applied to the laminated film 160. FIG. 15 is a schematic diagram showing the structure of the laminated film 160 after being stretched. If the Mohs hardness of the material of the color adjustment layer 162 is higher than that of the metal layer 161, even if the tensile fracture strength of the color adjustment layer 162 is smaller than that of the metal layer 161, the color adjustment layer 162 is more metallic than The layer 161 is broken first, and fine cracks 162 a are formed in the color adjustment layer 162.

If so, cracking of the metal layer 161 is induced by the cracking of the color adjustment layer 162, and fine cracks 161a are also formed in the metal layer 161. Accordingly, even when the metal layer 161 includes a material having a high breaking strength, fine cracks 161a can be formed in the metal layer 161 with a smaller tension.

In this way, the color adjustment layer 123 is formed from the color adjustment layer 162, and the insulating metal layer 122 is formed from the metal layer 161 (see FIG. 4). Then, the layer 121 flows into the micro-cracks 122a and the micro-cracks 123a by heating or the like, and fixes the crack pieces of the color adjustment layer 123 and the insulating metal layer 122. The decoration film 150 can be manufactured as described above.

The stretching of the laminated film 160 can be performed using, for example, a biaxial stretching device shown below. Fig. 16 is a schematic diagram showing the configuration of a biaxial extension device. The biaxial extension device 500 includes a base member 501 and four extension mechanisms 502 arranged on the base member 501 and having substantially the same configuration as each other.

The four extension mechanisms 502 are arranged in each of two axes (x-axis and y-axis) orthogonal to each other, and are arranged to face each other in each axis. Hereinafter, description will be made with reference to the extending mechanism 502a that extends the laminated film 160 in the opposite direction of the arrow in the y-axis direction.

The extension mechanism 502a includes a fixed block 503, a movable block 504, and a plurality of clips 505. The fixing block 503 is fixed to the base member 501. An extension screw 506 extending in the extension direction (y direction) penetrates the fixing block 503.

The movable block 504 is movably arranged on the base member 501. The movable block 504 is connected to an extension screw 506 penetrating the fixed block 503. Therefore, by operating the extension screw 506, the movable block 504 is movable in the y direction.

The plurality of clips 505 are juxtaposed in a direction (x direction) orthogonal to the extending direction. The slide shaft 507 extending in the x direction penetrates each of the plurality of clips 505.

The position of each clip 505 along the sliding axis 2507 can be changed in the x direction. Each of the plurality of clips 505 and the movable block 504 are connected by a link 508 and a connecting pin 509.

The elongation is controlled by the operation amount of the extension screw 506. The elongation can also be controlled by appropriately setting the number or position of the plurality of clips 505 and the length of the link 508. The configuration of the biaxial extension device 500 is not limited.

The biaxial stretching device 500 of this embodiment is a biaxial stretching device that uses a sheet that has been completely cut off to perform a biaxial stretching. However, the biaxial stretching may be continuously performed by a roller. Continuous biaxial extension can be achieved by, for example, tension in the direction of travel between the rollers, and tension provided at right angles to the direction of travel by the clip 505 provided in the room that moves synchronously with the travel.

A laminated film 160 is disposed on the base member 501, and a plurality of clips 505 of the extension mechanism 502 are attached to each of the four sides. In a state where the laminated film 160 is heated using a temperature-adjusted heating lamp or temperature-adjusted hot air, the four extension screws 506 are operated for biaxial extension.

For example, it is possible to set conditions such that the elongation in each axial direction is 2% and the substrate heating temperature is 130 ° C. If the elongation is too low, appropriate fine cracks are not formed, and the metal layer 161 has conductivity. At this time, due to the influence of the eddy current and the like, sufficient radio wave permeability is not exhibited. On the other hand, if the elongation is too large, damage to the base film 152 becomes large.

As a result, when the decorative film 12 is adhered to the area to be decorated 11, the yield may be deteriorated due to air entrapment or wrinkles. In addition, the design of the metal decorative portion 10 may be reduced due to the deformation of the base film 152 or the metal layer 161 itself.

In the multilayer film 160 of this embodiment, fine cracks can be formed appropriately at a relatively low elongation of 2% or less in the direction of each axis. Thereby, damage to the base film 152 can be sufficiently prevented, and the yield can be improved.

In addition, the designability of the metal decorative portion 10 to which the decorative film 12 is adhered can be maintained high. Needless to say, the elongation can be appropriately set, and if the above-mentioned bad condition does not occur, an elongation of 2% or more can be set.

[Manufacturing method of structure]
A manufacturing method of the case portion 101 including the metal decorative portion 10 will be described. The case portion 101 including the metal decorative portion 10 can be manufactured by an in-mold molding method.

FIG. 17 is a schematic diagram for explaining an in-mold forming method. In-mold forming is performed by a forming apparatus 600 having a cavity mold 601 and a core mold 602 as shown in FIG. 17. As shown in FIG. 17A, a concave portion 603 corresponding to the shape of the housing portion 101 is formed in the cavity mold 601.

The decoration film 150 is arranged such that the base film 152 is on the side of the recessed portion 603 and covers the recessed portion 603. The decorative film 150 may be supplied from the outside of the forming apparatus 600 by, for example, a roll-to-roll method.

As shown in FIG. 17B, the cavity mold 601 and the core mold 602 are locked, and the molding resin R is injected toward the recessed portion 603 through a gate portion 606 formed in the core mold 602. The molding resin R is a resin that becomes a material of the case portion 101.

The cavity mold 601 is formed with a feeder portion 608 for supplying the molding resin R, and a runner portion 609 connected thereto. When the cavity mold 601 and the core mold 602 are locked, the runner portion 609 and the gate portion 606 are connected.

Thereby, the molding resin R supplied to the riser portion 608 is ejected toward the recessed portion 603. In addition, the configuration for the injection molding resin R is not limited.

As the molding resin R, engineering resins such as general-purpose resins such as ABS (acrylonitrile-butadiene-styrene copolymer) resins, PC resins, and mixed resins of ABS and PC are used. Without being limited thereto, the material or color (transparency) of the molding resin R can be appropriately selected to obtain the desired case portion 101.

The molding resin R is ejected toward the recessed portion 603 in a molten state at a high temperature. The molding resin R is injected so as to press the inner surface of the recessed portion 603. At this time, the decorative film 150 disposed in the recessed portion 603 is deformed by being pressed by the molding resin R.

Due to the heat of the molding resin R, the bonding layer 121 formed on the decorative film 150 is melted, and the decorative film 12 is bonded to the surface of the molding resin R.

After the molding resin R is injected, the cavity mold 601 and the core mold 602 are cooled, and the clamping is released. At this time, the base film 152 is peeled together with the release layer 151. A molding resin R to which the decorative film 12 is transferred is attached to the core mold 602.

By taking out the molding resin R, a case portion 101 having a metal decorative portion 10 formed in a specific region is manufactured. By using the in-mold forming method, positioning of the decorative film 12 is easy, and the metal decorative portion 10 can be easily formed. Moreover, the degree of freedom in designing the shape of the case portion 101 is increased, and the case portion 101 having various shapes can be manufactured.

In addition, the antenna portion 15 housed inside the case portion 101 can be mounted by an in-mold molding method when the case portion 101 is formed. Alternatively, the antenna portion 15 may be attached to the inside of the casing portion 101 after the casing portion 101 is formed. In addition, the antenna unit 15 may be built in the carcass.

In addition, the manufacturing method of the case portion 101 provided with the metal decorative portion 10 is not limited to the method shown here, and the case portion 101 provided with the metal decorative portion 10 may be manufactured by other manufacturing methods.

[About the size of the crack sheet]
The size of the crack piece 122b of the insulating metal layer 122 will be described. FIG. 18 is a schematic diagram of the insulating metal layer 122 and an enlarged view of FIG. 3. If the length of the longest side of each cracked piece 122b is set as the cracked piece size T as shown in this figure, the cracked piece size T is preferably 1 μm or more and 500 μm or less.

When the size T of the crack pieces is less than 1 μm, the area of the crack pieces 122 b with respect to the fine cracks 122 a is too small, and no metallic luster is generated in the metal decorative portion 10. When the size T of the crack sheet exceeds 500 μm, an eddy current is generated when the radio wave passes through the insulating metal layer 122, and the transmittance of the radio wave is reduced. Therefore, the crack sheet size T is preferably 1 μm to 500 μm.

(Second Embodiment)
A second embodiment of the present invention will be described. In this embodiment, the same reference numerals are given to the same configurations as those in the first embodiment, and descriptions thereof are omitted.

The decorative film 22 (refer to FIG. 19) of this embodiment is the same as the first embodiment, and the metal decorative portion 20 is formed next to the decorated area 11 provided in the housing portion 101 of the mobile terminal 100 (see FIG. 1).

That is, the structure body of the present invention is constituted as a housing part by the housing portion 101 having the decorated area 11 and the decoration film 22 subsequent to the decorated area 11. In addition, the structure of the present invention may be used in a part of a housing part.

[Composition of Metal Decoration Department]
FIG. 19 is a schematic cross-sectional view showing the configuration of the metal decorative portion 20 of this embodiment. As shown in the figure, the metal decorative portion 20 is composed of a decorative region 11 formed in a region corresponding to a position of the antenna portion 15 and the like, and a decorative film 22 subsequent to the decorative region 11. In the decoration film 22, the surface adjoining the to-be-decorated area 11 is made into the adhesion surface 22a.

In this embodiment, the case portion 101 is a light-transmitting member such as glass or synthetic resin, and the surface of the case portion 101 opposite to the decorative film 22 is the design surface 101 a. The design surface 101 a is a surface that is visually recognized by a user using the mobile terminal 100, and is a surface that becomes one of the elements constituting the appearance of the housing portion 101.

The decorative film 22 side of the case portion 101 is inside the mobile terminal 100, and the antenna portion 15 is disposed on the back side of the decorative film 22 (the opposite side from the case portion 101).

As shown in FIG. 19, the decorative film 22 includes an adhesive layer 221, a color adjustment layer 222, an insulating metal layer 223, an easy-adhesion layer 224, and a protective layer 225. Unlike the first embodiment, the color adjustment layer 222 and the insulating metal layer 223 are laminated so that the color adjustment layer 222 becomes the housing portion 101 side.

The adhering layer 221 attaches the decorative film 22 to the decorated area 11. The material of the adhesive layer 221 is only required to be transparent, and for example, a thermoplastic resin can be used. Further, as described later, a crack is provided in the color adjustment layer 222 and the insulating metal layer 223, and then the layer 221 enters the inside of the crack, and also functions as a fixed layer for fixing the crack sheet of the color adjustment layer 222 and the insulating metal layer 223 Features.

The color adjustment layer 222 is adjacent to the design surface 101a side of the insulating metal layer 223, and has translucency in the visible light region, and interferes with the reflected light generated by the insulating metal layer 223. Thereby, the color of the metal decorative portion 20 can be adjusted by the structural color formed by the interference. Since the color adjustment layer 222 is provided with an insulating metal layer 223 on the lower layer, a single-layer film can be used.

The color adjustment layer 222 is the same as the color adjustment layer 123 of the first embodiment, and includes a material that has light transmittance in the visible light region and interferes with the reflected light generated by the insulating metal layer 223. Silicon, silicon Oxides, silicon nitrides, metal oxides or metal nitrides. As the metal oxide and metal nitride, those listed in the first embodiment can be used.

In the color adjustment layer 222, fine cracks (hereinafter referred to as fine cracks) 222a are formed. The fine crack 222a is a crack connected to the fine crack 223a provided in the insulating metal layer 223 as shown in FIG.

As in the first embodiment, by making the Mohs hardness of the color adjustment layer 222 higher than the Mohs hardness of the insulating metal layer 223, the color adjustment layer 222 can function as a crack inducing layer.

In addition, the color adjustment layer 222 may not be used as a crack-inducing layer, and the color adjustment layer 222 may be one without micro-cracks 222a.

The thickness of the color adjustment layer 222 is preferably 10 nm or more and 300 nm or less as in the color adjustment layer 123 of the first embodiment. In addition, the thickness and material composition (oxidation degree, etc.) of the color adjustment layer 222 may be non-uniform within the surface of the color adjustment layer 222, or it may be set to show rainbow colors by adjusting the thickness or material composition distribution within the surface .

The insulating metal layer 223 is a layer for setting the metallic decorative portion 20 to have a metallic appearance. A plurality of fine cracks (hereinafter referred to as fine cracks) 223 a are formed in the insulating metal layer 223. The shape of the fine cracks 223a is the same as that of the fine cracks 122a of the first embodiment (see FIG. 3).

The material of the insulating metal layer 223 is a material having a high light reflectance, and any of aluminum, titanium, chromium, and silver, or an alloy including at least one of aluminum, titanium, chromium, and silver may be used.

The thickness of the insulating metal layer 223 is preferably 10 nm or more and 300 nm or less as in the insulating metal layer 122 of the first embodiment.

The easy-adhesion layer 224 is a layer in which the protective layer 225 is adhered to the insulating metal layer 223. The easy-adhesion layer 224 may be one having adhesiveness, or one having no light-transmitting property.

The protective layer 225 is a layer (hard coat layer) that protects each layer of the decorative film 22. The protective layer 225 may include a UV curable resin, a thermosetting resin, or a two-liquid curable resin. The protective layer 225 realizes smoothing, antifouling, peeling prevention, and damage prevention. In addition, as the protective layer 225, an acrylic resin or the like can be applied. In addition, by selecting a non-vinyl chloride-based material as the protective layer 225, it is advantageous to prevent corrosion of metals.

The metal decorative portion 20 has the structure described above. As described above, the metal decorative portion 20 may be one in which a decorative film is transferred to the decorative region 11 of the case portion 101. The following describes the decorative film for transfer.

[Configuration of decorative film for transfer]
FIG. 20 is a schematic cross-sectional view showing the structure of the decorative film 250 for transfer. In the structure of the decoration film 250, the same code | symbol is attached | subjected to the structure similar to the said decoration film 22, and description is abbreviate | omitted.

As shown in the figure, the decoration film 250 includes an adhesive layer 221, a color adjustment layer 222, an insulating metal layer 223, an easy-adhesion layer 224, a protective layer 225, a release layer 251, and a base film 252.

The release layer 251 is a layer laminated on the protective layer 225 and adhering the protective layer 225 and the base film 252. The release layer 251 includes an adhesive material having a relatively small adhesive force.

The base film 252 is a layer that becomes a support for each layer of the decorative film 250. The base film 252 is typically a resin film. As the material of the base film 252, for example, PET, PC, PMMA, or PP is used. Other materials can also be used.

The decoration film 250 has the structure described above. The decorative film 250 is attached to the area to be decorated 11 through the adhesive layer 221. When the release layer 251 and the base film 252 are peeled off, the metal decorative portion 20 shown in FIG. 19 is formed.

[About the effect of the metal decoration department]
Similar to the first embodiment, the metal decorative portion 20 can achieve high light reflectivity generated by the insulating metal layer 223 and adjustment of color by the color adjustment layer 222. On the one hand, it has radio wave permeability and has Highly designed structure with metallic appearance.

[Manufacturing method of decorative film]
The decorative film 250 can be manufactured by the same method as the first embodiment. That is, a multilayer film is prepared, and a tension is applied to the multilayer film by stretching it to form fine cracks in the color adjustment layer 222 and the insulating metal layer 223. For stretching the laminated film, the stretching mechanism described in the first embodiment can be used.

The Mohs hardness of the color adjustment layer 222 is set to be greater than the Mohs hardness of the insulating metal layer 223, and the color adjustment layer 222 can be used as a crack-inducing layer. The decoration film 250 may be manufactured in the above manner.

[Manufacturing method of structure]
As with the first embodiment, the case portion 101 including the metal decorative portion 20 can be manufactured by transferring the decorative film 250 to the case portion 101 by in-mold molding. In addition, the case portion 101 including the metal decorative portion 20 may be manufactured by another manufacturing method.

[About the size of the crack sheet]
The size of the crack pieces 223b of the insulating metal layer 223 is the same as that of the first embodiment (see FIG. 18). If the length of the longest side of each crack piece 223b is set to the size of the crack pieces, the size of the crack pieces is preferably 1 μm Above 500 μm.

If the size T of the crack pieces is less than 1 μm, the area of the crack pieces 223b with respect to the fine cracks 223a is too small, and the metallic decorative portion 20 does not generate metallic luster. When the size of the crack sheet exceeds 500 μm, an eddy current is generated when a radio wave passes through the insulating metal layer 223, and the transmittance of the radio wave is reduced. Therefore, the crack sheet size is preferably 1 μm to 500 μm.

(Third Embodiment)
A third embodiment of the present invention will be described. In this embodiment, the same reference numerals are given to the same configurations as those in the first embodiment, and descriptions thereof are omitted.

The decorative film 32 (refer to FIG. 21) of the present embodiment is the same as the first embodiment, and is followed by the to-be-decorated region 11 included in the housing portion 101 of the mobile terminal 100 (refer to FIG. 1) to form a metal decorative portion 30.

That is, the structure body of the present invention is constituted as a housing part by the case portion 101 having the decorated region 11 and the decoration film 32 subsequent to the decorated region 11. In addition, the structure of the present invention may be used in a part of a housing part.

The decorative film 32 has a design surface 32a. The design surface 32a is a surface that is visible to a user using the mobile terminal 100, and is a surface that becomes one of the elements constituting the appearance (design) of the housing portion 101. In this embodiment, the surface facing the front side of the back surface portion 108 is the design surface 32a.

[Composition of Metal Decoration Department]
FIG. 21 is a schematic cross-sectional view showing the configuration of the metal decorative portion 30 according to this embodiment. As shown in the figure, the metal decorative portion 30 is composed of a decorative region 11 formed in a region corresponding to the position of the antenna portion 15 and the like, and a decorative film 32 subsequent to the decorative region 11. In the decoration film 32, the surface adjoining the to-be-decorated area 11 is made into the adhesion surface 32b.

As shown in FIG. 21, the decorative film 32 includes an adhesive layer 321, an insulating metal layer 322, a color adjustment layer 323, an easy-adhesion layer 324, a base film 325, and a protective layer 326. The insulating metal layer 322 and the color adjustment layer 323 are laminated so that the insulating metal layer 322 becomes the case portion 101 side, as in the first embodiment.

The adhering layer 321 attaches the decorative film 32 to the decorated area 11. The material of the adhesion layer 321 may be, for example, a thermoplastic resin. In addition, a crack is provided in the insulating metal layer 322 and the color adjustment layer 323 as described later, and then the layer 321 enters the inside of the crack, and also functions as a fixed layer for fixing the crack sheet of the insulating metal layer 322 and the color adjustment layer 323 Features.

The insulating metal layer 322 is a layer for setting the metallic decorative portion 30 to have a metallic appearance. A plurality of fine cracks (hereinafter referred to as fine cracks) 322 a are formed in the insulating metal layer 322. The shape of the fine cracks 322a is the same as that of the fine cracks 122a of the first embodiment (see FIG. 3).

The material of the insulating metal layer 322 is a material having a high light reflectance, and any of aluminum, titanium, chromium, and silver, or an alloy including at least one of aluminum, titanium, chromium, and silver may be used.

The thickness of the insulating metal layer 322 is preferably 10 nm or more and 300 nm or less as in the insulating metal layer 122 of the first embodiment.

The color adjustment layer 323 is adjacent to the design surface 32a side of the insulating metal layer 322, and has translucency in the visible light region, and interferes with the reflected light generated by the insulating metal layer 322. Thereby, the color of the metal decorative portion 30 can be adjusted by the structural color formed by the interference. Since the color adjustment layer 323 is provided with an insulating metal layer 322 on the lower layer, a single-layer film can be used.

The color adjustment layer 323 is the same as the color adjustment layer 123 of the first embodiment. The color adjustment layer 323 includes a material that is transparent in the visible light region and interferes with the reflected light generated by the insulating metal layer 322. Silicon, silicon Oxides, silicon nitrides, metal oxides or metal nitrides. As the metal oxide and metal nitride, those listed in the first embodiment can be used.

Fine color cracks (hereinafter referred to as fine cracks) 323 a are formed in the color adjustment layer 323. The fine cracks 323a are connected to the fine cracks 322a provided in the insulating metal layer 322 as shown in FIG. 21.

As in the first embodiment, by making the Mohs hardness of the color adjustment layer 323 higher than that of the insulating metal layer 322, the color adjustment layer 323 can function as a crack-inducing layer.

In addition, the color adjustment layer 323 may not be used as a crack-inducing layer, and the color adjustment layer 323 may be one without micro-cracks 323a.

The thickness of the color adjustment layer 323 is preferably 10 nm or more and 300 nm or less as in the color adjustment layer 123 of the first embodiment. In addition, the thickness and material composition (oxidation degree, etc.) of the color adjustment layer 323 may be non-uniform within the surface of the color adjustment layer 323, or may be set to show a rainbow color by adjusting the thickness or material composition distribution within the surface By.

The easy-adhesion layer 324 is a layer that adheres the base film 325 to the color adjustment layer 323. The easily-adhesive layer 324 only needs to have adhesiveness and translucency.

The base film 325 is a layer which becomes a support body of each layer of the decoration film 32, and has translucency. The base film 325 typically uses a resin film. As the material of the base film 325, for example, PET, PC, PMMA, or PP is used. Other materials available.

The protective layer 326 is a layer (hard coat layer) that protects each layer of the decorative film 32, and has a light-transmitting property. The protective layer 326 may include a UV curable resin, a thermosetting resin, or a two-liquid curable resin. The protective layer 326 realizes smoothing, antifouling, peeling prevention, and damage prevention. The protective layer 326 may be coated with an acrylic resin or the like. In addition, by selecting a non-vinyl chloride-based material as the protective layer 326, it is advantageous to prevent corrosion of metals.

The metal decorative portion 30 has the structure described above. As described above, the metal decorative portion 30 may be one in which a decorative film is embedded or adhered to the decorated area 11 of the case portion 101. The following describes the decorative film for transfer.

[Construction of Embedding Film or Adhesive Film]
FIG. 22 is a schematic cross-sectional view showing the constitution of the decoration film 350 embedded or subsequently used. In the structure of the decoration film 350, the same code | symbol is attached | subjected to the structure similar to the said decoration film 32, and description is abbreviate | omitted.

As shown in this figure, the decoration film 350 has the same configuration as the decoration film 32 described above, and includes an adhesive layer 321, an insulating metal layer 322, a color adjustment layer 323, an easy-adhesion layer 324, a base film 325, and a protective layer 326.

[About the effect of the metal decoration department]
As in the first embodiment, in the metal decorative portion 30, the high light reflectance formed by the insulating metal layer 322 and the color adjustment by the color adjustment layer 323 can be achieved, and radio wave permeability can be achieved on one side. The design with a metallic appearance on one side is a high-quality structure.

[Manufacturing method of decorative film]
The decorative film 350 can be manufactured in the same manner as in the first embodiment. That is, a multilayer film is prepared, and by stretching the multilayer film and applying tension, fine cracks are formed in the color adjustment layer 323 and the insulating metal layer 322. The stretch mechanism of the laminated film can be used as described in the first embodiment.

By making the Mohs hardness of the color adjustment layer 323 greater than that of the insulating metal layer 322, the color adjustment layer 323 can be used as a crack-inducing layer. The decoration film 350 can be manufactured as described above.

[Manufacturing method of structure]
A method of manufacturing the case portion 101 including the metal decorative portion 30 will be described. The case portion 101 including the metal decorative portion 30 can be manufactured by an insert molding method.

FIG. 23 is a schematic diagram for explaining an insert molding method. In the insert molding, as shown in FIG. 23A, in the cavity mold 651 of the molding device 650, the decorative film 350 is arranged with the protective layer 326 as the cavity mold 651 side.

As shown in FIG. 23B, the cavity mold 651 and the core mold 652 are locked, and the molding resin R is injected into the cavity mold 651 through the gate portion 656.

Thereby, the case portion 101 is formed integrally with the decorative film 350. By using the insert molding method, the metal decorative portion 30 can be easily formed. In addition, the housing portion 101 having various shapes can be manufactured.

[About the size of the crack sheet]
The size of the crack pieces 322b of the insulating metal layer 322 is the same as that of the first embodiment (see FIG. 18). If the length of the longest side of each crack piece 322b is set to the size of the crack pieces, the size of the crack pieces is preferably 1 μm to 500 μm.

When the size T of the crack pieces is less than 1 μm, the area of the crack pieces 322 b with respect to the fine cracks 322 a is too small, and no metallic luster is generated in the metal decorative portion 20. When the size of the crack sheet exceeds 500 μm, an eddy current is generated when a radio wave passes through the insulating metal layer 322, and the transmittance of the radio wave is reduced. Therefore, the crack sheet size is preferably 1 μm to 500 μm.

(Modification)
In each of the embodiments described above, the insulating metal layer is divided into a plurality of crack pieces by the micro-cracks to have insulation properties, but the invention is not limited thereto. .

When tin and indium are vapor-deposited at a film thickness of 10 nm to 50 nm, a sea-island structure is obtained, which becomes a discontinuous film and exhibits insulation properties. Therefore, in each of the above embodiments, the insulating metal layer may be made of tin or indium having a thickness of 10 nm to 50 nm and having no fine cracks. In addition, if it has an insulating property when the film thickness is 10 nm to 50 nm, the insulating metal layer may be formed using an alloy containing at least one of tin and indium.

FIG. 24 is a schematic diagram showing a modification example of the decorative film 150 according to the first embodiment. As shown in the figure, the insulating metal layer 122 may be a layer containing tin, indium, or an alloy thereof having a thickness of 10 nm to 50 nm and not having fine cracks.

In addition, the insulating metal layer 223 of the second embodiment and the insulating metal layer 322 of the third embodiment can be similarly made of an alloy including tin, indium, or the like having a thickness of 10 nm to 50 nm and not having Layer of fine cracks.

(Application example)
The present invention can be applied to almost all electronic devices in which a built-in antenna or the like is housed. Examples of such electronic devices include mobile phones, smartphones, computers, game consoles, digital cameras, audio equipment, TVs, projectors, car navigation, GPS terminals, wearable information equipment (glasses, wristbands) Type), electronic devices such as wireless remote control, remote control devices such as a mouse, stylus, etc., and various electronic devices such as a vehicle-mounted radar or a vehicle-mounted antenna. It can also be applied to IoT devices connected to the Internet.

In addition, the present invention is not limited to housing parts such as electronic equipment, and can be applied to vehicles and buildings. That is, the structure provided with the decoration part and the member which has a to-be-decorated area | region adhering the decoration part of this invention can be used for the whole or a part of a vehicle or a building. This makes it possible to realize a vehicle or a building that has a metallic appearance but allows radio waves to pass therethrough, and can exhibit a very high design. The vehicle includes an arbitrary vehicle such as a car, a bus, and a tram. Buildings include arbitrary buildings such as single houses, collective houses, facilities, and bridges.

In addition, the present invention can also adopt the following configuration.
(1)
A structure having:
The decorative portion includes: an insulating metal layer; and a color adjustment layer, which is adjacent to the design surface side of the above-mentioned insulating metal layer, and has translucency in the visible light region, and reflects light generated by the above-mentioned insulating metal layer. Generating interference; and a member having a decorated area for adhering to the aforementioned decorative portion.

(2)
The structure as described in (1) above, wherein the insulating metal layer has fine cracks.

(3)
The structure according to the above (2), wherein the insulating metal layer includes any one of aluminum, titanium, chromium, silver, and an alloy containing at least one of them.

(4)
The structure as described in (1) above, wherein the insulating metal layer is a discontinuous film of a metal.

(5)
The structure according to the above (4), wherein the insulating metal layer contains any one of indium, tin, and an alloy containing at least one of them.

(6)
The structure according to any one of (1) to (5) above, wherein the color adjustment layer includes silicon, silicon oxide, silicon nitride, metal oxide, or metal nitride.

(7)
The structure according to any one of the above (1) to (6), wherein the color adjustment layer has a Mohs hardness higher than that of the insulating metal layer.

(8)
The structure according to any one of (1) to (7) above, wherein the thickness of the color adjustment layer is 10 nm to 300 nm.

(9)
The structure according to any one of (1) to (8), wherein the thickness of the insulating metal layer is 10 nm to 300 nm.

(10)
The structure as described in (2) above, wherein the long side of the cracked piece of the insulating metal layer is 1 μm or more and 500 μm or less.

(11)
The structural body according to any one of the above (1) to (10), further comprising an adhesive layer for fixing the crack sheet of the insulating metal layer.

(12)
The structure according to any one of (1) to (11) above, which is at least a part of a housing part, a vehicle, or a building.

(13)
A decorative film having:
Basement membrane
An insulating metal layer; and a color adjustment layer which is in contact with the design surface side of the above-mentioned insulating metal layer, and has translucency in the visible light region, and interferes with reflected light generated by the above-mentioned insulating metal layer.

(14)
The decorative film according to the above (13), wherein the insulating metal layer has fine cracks.

(15)
A method for manufacturing a decorative film, which forms a laminated film comprising: a base film; a metal layer; and a color adjustment layer having a Mohs hardness higher than that of the metal layer, adjacent to the metal layer, and visible light. The region is translucent and interferes with the reflected light generated by the insulating metal layer; the laminated film is extended, and fine cracks are generated in the metal layer and the color adjustment layer, so that the metal layer is insulated Sexual metal layer.

10‧‧‧Metal Decoration Department

11‧‧‧ Decorated area

12‧‧‧ decorative film

12a‧‧‧Design surface

12b‧‧‧ continue

15‧‧‧ Antenna Department

16‧‧‧antenna coil

20‧‧‧Metal Decoration Department

22‧‧‧decorative film

22a‧‧‧continued

30‧‧‧Metal Decoration Department

32‧‧‧decorative film

32a‧‧‧Design surface

32b‧‧‧continued

100‧‧‧ mobile terminal

101‧‧‧shell

101a‧‧‧Design surface

102‧‧‧Front

103‧‧‧Call Department

104‧‧‧Touch Panel

105‧‧‧ Opposite Camera

106‧‧‧Speaker Department

107‧‧‧Voice input section

108‧‧‧ back

121‧‧‧ Adjacent layer

122‧‧‧ Insulating metal layer

122a‧‧‧Crack / fine crack

122b‧‧‧Crack

123‧‧‧Color Adjustment Layer

123a‧‧‧Crack / fine crack

124‧‧‧ Easy to attach

125‧‧‧ protective layer

150‧‧‧decorative film

151‧‧‧Release layer

152‧‧‧ basement membrane

160‧‧‧ laminated film

161‧‧‧metal layer

161a‧‧‧fine crack

162‧‧‧Color Adjustment Layer

162a‧‧‧fine crack

221‧‧‧ Adjacent Layer

222‧‧‧Color Adjustment Layer

222a‧‧‧Crack / fine crack

223‧‧‧ insulating metal layer

223a‧‧‧Crack / fine crack

223b‧‧‧Crack

224‧‧‧ Easy Adhesive Layer

225‧‧‧protective layer

250‧‧‧ decorative film

251‧‧‧Release layer

252‧‧‧ basement membrane

321‧‧‧adjacent layer

322‧‧‧ insulating metal layer

322a‧‧‧Crack / fine crack

322b‧‧‧Crack

323‧‧‧Color Adjustment Layer

323a‧‧‧Crack / fine crack

324‧‧‧ Easy to attach

325‧‧‧ basement membrane

326‧‧‧protective layer

350‧‧‧decorative film

500‧‧‧biaxial extension device

501‧‧‧ base member

502‧‧‧Extended Agency

502a‧‧‧Extended institution

503‧‧‧Fixed block

504‧‧‧movable block

505‧‧‧clip

506‧‧‧ extension screw

507‧‧‧sliding shaft

508‧‧‧ connecting rod

509‧‧‧link pin

600‧‧‧forming device

601‧‧‧cavity mold

602‧‧‧ core mold

603‧‧‧ recess

606‧‧‧Gate Department

608‧‧‧Riser

609‧‧‧Gate Department

650‧‧‧forming device

651‧‧‧cavity mold

652‧‧‧ core mold

656‧‧‧Gate Department

R‧‧‧forming resin

T‧‧‧Crack Sheet Size

x‧‧‧ axis / direction

y‧‧‧axis / direction

1A and 1B are perspective views of a mobile terminal according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a metal decorative portion provided in the mobile terminal.

FIG. 3 is a plan view of an insulating metal layer provided in the metal decorative portion.

FIG. 4 is a cross-sectional view of a decorative film for forming the metal decorative portion.

Fig. 5 is a graph showing the reflectance wavelength dispersion of aluminum and tin.

Fig. 6 is a graph showing the single-layer silicon and reflectance wavelength dispersion.

Figure 7 is a table showing the color of reflected light from a single layer of silicon.

Fig. 8 is a graph showing the wavelength dispersion of the reflectance of a laminated body in which a single layer of silicon is laminated on aluminum having a thickness of 60 nm.

FIG. 9 is a table showing the color of the reflected light of the laminated body.

FIG. 10 is a graph showing the wavelength dispersion of the reflectance of a laminated body having a single layer of SiO _x (oxidation degree 0.2) laminated on aluminum having a thickness of 60 nm.

FIG. 11 is a table showing the color of the reflected light of the laminated body.

FIG. 12 is a graph showing the wavelength dispersion of the reflectance of a laminated body having a single layer of SiO _x (oxidation degree 0.5) laminated on aluminum having a thickness of 60 nm.

FIG. 13 is a table showing the color of the reflected light of the laminated body.

FIG. 14 is a schematic diagram of a laminated film as a decorative film according to the first embodiment of the present invention.

FIG. 15 is a schematic diagram showing a state where fine cracks are formed in the metal layer of the laminated film.

FIG. 16 is a schematic diagram of a biaxial stretching device used for stretching of the laminated film.

17A and 17B are schematic views showing an in-mold forming method for forming a metal decorative portion according to the first embodiment of the present invention.

FIG. 18 is a schematic diagram showing the size of fine cracks of the insulating metal layer provided in the metal decorative portion.

Fig. 19 is a schematic diagram of a metal decorative portion according to a second embodiment of the present invention.

FIG. 20 is a cross-sectional view of a decorative film for forming the metal decorative portion.

Fig. 21 is a cross-sectional view showing a metal decorative portion according to a third embodiment of the present invention.

22 is a cross-sectional view of a decorative film for forming a metal decorative portion.

23A and 23B are schematic diagrams showing an insert molding method for forming the metal decorative portion.

Fig. 24 is a sectional view of a decorative film according to a modification of the present invention.

Claims (15)

A structure having: The decorative portion includes: an insulating metal layer; and a color adjustment layer, which is adjacent to the design surface side of the aforementioned insulating metal layer, has a light transmitting property in a visible light region, and reflects light generated by the aforementioned insulating metal layer. Cause interference; and A member having a decorated area for adhering to the aforementioned decorative portion. As the structure of claim 1, where The insulating metal layer has fine cracks. As the structure of claim 2, where The insulating metal layer includes any one of aluminum, titanium, chromium, silver, and an alloy containing at least one of them. As the structure of claim 1, where The insulating metal layer is a discontinuous film of a metal. As the structure of claim 4, wherein The insulating metal layer includes any one of indium, tin, and an alloy containing at least one of them. As the structure of claim 1, where The color adjustment layer includes silicon, silicon oxide, silicon nitride, metal oxide, or metal nitride. As the structure of claim 1, where The color adjustment layer has a Mohs hardness higher than that of the insulating metal layer. For example, the structure of claim 1, wherein the thickness of the color adjustment layer is greater than or equal to 10 nm and less than or equal to 300 nm. As the structure of claim 1, where The thickness of the insulating metal layer is 10 nm to 300 nm. As the structure of claim 2, where The long side of the cracked piece of the insulating metal layer is 1 μm or more and 500 μm or less. As the structure of claim 2, it is more equipped An adhesive layer for fixing the crack sheet of the insulating metal layer. The structure of claim 1 is at least a part of a housing part, a vehicle or a building. A decorative film having: Basement membrane Insulating metal layer; and The color adjustment layer is adjacent to the design surface side of the insulating metal layer, has a light transmitting property in a visible light region, and interferes with reflected light generated by the insulating metal layer. The decorative film as claimed in item 13, wherein The insulating metal layer has fine cracks. A method for manufacturing a decorative film, which forms a laminated film comprising: a base film; a metal layer; and a color adjustment layer having a Mohs hardness higher than that of the aforementioned metal layer, adjacent to the aforementioned metal layer, and visible light The region is translucent and interferes with the reflected light generated by the aforementioned insulating metal layer; and The laminated film is extended to cause fine cracks in the metal layer and the color adjustment layer, and the metal layer is an insulating metal layer.