WO2020153137A1

WO2020153137A1 - Structure, decorative film, method for manufacturing structure, and method for manufacturing decorative film

Info

Publication number: WO2020153137A1
Application number: PCT/JP2020/000461
Authority: WO
Inventors: 斉藤　揚訓
Original assignee: ソニー株式会社
Priority date: 2019-01-25
Filing date: 2020-01-09
Publication date: 2020-07-30
Also published as: JPWO2020153137A1

Abstract

A structure according to an embodiment of the present technology is provided with a decoration part and a member. The decoration part has a first surface, a second surface, a metal layer, and a light shielding portion. The second surface is a surface on the reverse side of the first surface. The metal layer has fine cracks. The light shielding portion is formed in at least one among a gap between the fine cracks or a region between the metal layer and the second surface. The member has a region to be decorated to which the decoration part is adhered so that the first surface serves as the front-surface side.

Description

Structure, decorative film, method of manufacturing structure, and method of manufacturing decorative film

The present technology relates to a structure, a decorative film, a method for manufacturing the structure, and a method for manufacturing the decorative film that can be applied to electronic devices, vehicles, and the like.

Conventionally, a member that has a metallic appearance and is capable of transmitting electromagnetic waves such as millimeter waves has been devised as a case component for electronic devices and the like. For example, Patent Document 1 discloses an exterior part for mounting an automobile radar on an emblem of an automobile. For example, indium is vapor-deposited on a resin film, and this film is attached to the surface layer of the emblem by the insert molding method. This makes it possible to manufacture an exterior part that has a decorative metallic luster and does not have an absorption band in the electromagnetic wave frequency band due to the island-shaped structure of indium (paragraph [0006] in the specification of Patent Document 1, etc.). ).

However, the method of forming the island-shaped structure of indium has a problem that it is difficult to form a uniform film thickness on the whole when the deposition area is large. There is also a problem that the island-shaped structure is easily destroyed by the temperature of the poured resin when molding the housing component (paragraphs [0007] [0008] in the specification of Patent Document 1).

In order to solve this problem, Patent Document 1 discloses the following technique. That is, a sea-island structure in which a metal region is an island and a metal-free region surrounding the island is the sea is artificially formed with regularity. The metal regions are insulated from each other by the non-metal regions, and the area of the metal regions and the space between the metal regions adjacent to each other are appropriately controlled. According to this, an electromagnetic wave transmitting material which is comparable to the film on which indium is vapor-deposited can be obtained (paragraph [0013] in the specification of Patent Document 1).

JP, 2010-251899, A

There is a demand for a technology for manufacturing components that have a metallic luster and can transmit radio waves, and that are highly aesthetic.

In view of the circumstances as described above, an object of the present technology is to provide a structure having a metallic appearance and a high design property capable of transmitting radio waves, a decorative film, a method for manufacturing the structure, and a decorative film. It is to provide a manufacturing method.

In order to achieve the above-mentioned object, a structure concerning one form of this art is provided with a decoration part and a member.
The decorating section has a first surface, a second surface, a metal layer, and a light shielding section.
The second surface is a surface opposite to the first surface.
The metal layer has fine cracks.
The light shielding portion is formed in at least one of the gap between the fine cracks or between the metal layer and the second surface.
The member has a decorated region to which the decorative portion is adhered so that the first surface is on the front surface side.

In this structure, a light shielding part is formed in at least one of the gap between the fine cracks or between the metal layer and the second surface. This makes it possible to suppress the light transmitted through the gaps of the minute cracks. As a result, it is possible to realize a highly-designed structure that can transmit radio waves while having a metallic appearance.

The light-shielding portion may include a gap light-shielding portion formed in the gap between the minute cracks.

The light shielding portion may include a light shielding layer formed between the metal layer and the second surface.

The light-shielding portion is a gap light-shielding portion formed in a gap of the minute crack, and a light-shielding layer located between the metal layer and the second surface and integrally formed with the gap light-shielding portion. May be included.

The decorating section may include a decorating function section having a decorating function that is configured in at least one of the gap between the fine cracks or between the metal layer and the second surface.

The decoration function section may have a decoration function using at least one of transmission and reflection of light.

The decorating function unit may include a gap decorating function unit configured in the gap of the fine crack.

The decorating functional section may include a decorating functional layer formed between the metal layer and the second surface.

The decorating functional section is located between the gap decorating functional section configured in the gap of the fine crack and the metal layer and the second surface, and is integrally formed with the gap decorating functional section. The decorative functional layer may be included.

The metal layer may be any one of aluminum, titanium, chromium, and an alloy containing at least one of these.

The metal layer may have a thickness of 30 nm or more and 300 nm or less.

The fine cracks may be included in a pitch range of 1 μm or more and 500 μm or less.

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

The decoration section may have a fixing layer for fixing the fine cracks.

A decorative film according to an aspect of the present technology includes a base film and the decorative portion formed on the base film.

A method for manufacturing a structure according to an aspect of the present technology includes forming a metal layer on a base film by vapor deposition.
By stretching the base film, fine cracks are formed in the metal layer.
A decorative film including a metal layer in which the fine cracks are formed, a gap between the fine cracks, or a light-shielding portion formed on at least one of the surface opposite to the metal layer and the design surface. It is formed.
A transfer film is formed by adhering a carrier film to the decorative film.
A molded component is formed by an in-mold molding method, a hot stamping method, or a vacuum molding method so that the decorative film is transferred from the transfer film.

In the method for manufacturing a structure according to another aspect of the present technology, the metal layer in which the fine cracks are formed, the gap between the fine cracks, or between the metal layer and the surface opposite to the design surface. A transfer film including at least one light-shielding portion is formed. In addition, a molded component is formed by an in-mold molding method, a hot stamping method, or a vacuum molding method so that the metal layer and the light shielding portion separated from the base film are transferred.

In a method of manufacturing a structure according to another aspect of the present technology, a molded part is integrally formed with the decorative film by an insert molding method.

In the step of forming the fine cracks, the base film may be biaxially stretched at a stretching ratio of 5% or less in each axial direction.

A method for manufacturing a decorative film according to an aspect of the present technology includes forming a metal layer on a base film by vapor deposition.
By stretching the base film, fine cracks are formed in the metal layer.
A light-shielding portion is formed in at least one of the gap between the fine cracks and the surface of the metal layer opposite to the design surface.

It is a schematic diagram showing an example of composition of a personal digital assistant as an electronic device concerning one embodiment. It is a typical sectional view showing an example of composition of a metal decoration part shown in Drawing 1. It is the photograph which expanded and photographed the surface state of a metal layer with a microscope. It is the photograph which expanded and photographed the surface state of a metal layer with a microscope. It is a schematic diagram which shows the structural example of a vacuum evaporation system. It is a schematic diagram which shows the structural example of a biaxial stretching apparatus. It is a schematic diagram which shows the other structural example of a light-shielding part. It is a schematic diagram which shows the other structural example of a light-shielding part. It is a typical sectional view showing other examples of composition of a metal decoration part. It is a schematic diagram which shows the other structural example of a decoration function part. It is a schematic diagram which shows the other structural example of a decoration function part. It is a schematic diagram which shows the structural example at the time of combining a light-shielding part and a decoration function part. It is a schematic diagram for explaining the in-mold forming method. It is a schematic diagram for explaining an insert molding method. It is a schematic diagram showing an example of composition of a transfer film containing a base film and a metal layer. It is sectional drawing which shows the structural example of the glossy film which concerns on other embodiment. It is a figure which shows the relationship between the thickness of the coating layer formed as a support layer, and the pitch of a microcrack.

Hereinafter, an embodiment according to the present technology will be described with reference to the drawings.

[Electronic equipment configuration]
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 technology. 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 has a housing 101 and electronic parts (not shown) housed in the housing 101. As shown in FIG. 1A, a telephone unit 103, a touch panel 104, and a face-to-face camera 105 are provided on the front surface portion 102, which is the front surface side of the housing portion 101. The call unit 103 is provided to talk with the other party of the call, and includes a speaker unit 106 and a voice input unit 107. The voice of the other party is output from the speaker unit 106, and the voice of the user is transmitted to the other party via the voice input unit 107.

Various images and GUI (Graphical User Interface) are displayed on the touch panel 104. The user can browse a still image or a moving image via the touch panel 104. The user also inputs various touch operations via the touch panel 104. The face-to-face camera 105 is used when photographing the user's face or the like. The specific configuration of each device is not limited.

As shown in FIG. 1B, the back surface portion 108, which is the back surface side of the housing portion 101, is provided with a metal decoration portion 10 that is decorated to have a metallic appearance. The metal decoration portion 10 has a metallic appearance and is capable of transmitting radio waves.

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

In the present embodiment, the decorative film 12 corresponds to the decorative portion. Further, the casing 101 in which the decorated region 11 is formed corresponds to a member. The housing 101 having the decorated area 11 and the decorative film 12 bonded to the decorated area 11 configure the structure according to the present technology as a housing component. Note that the structure according to the present technology may be used for a part of the housing component.

In the example shown in FIG. 1B, the metal decoration portion 10 is partially formed in the approximate center of the back surface portion 108. The position where the metal decoration portion 10 is formed is not limited and may be set appropriately. For example, the metal decoration portion 10 may be formed on the entire back surface portion 108. This allows the entire back surface 108 to have a uniform metallic appearance.

It is also possible to make the entire back surface portion 108 have a uniform metallic appearance by making the other portions around the metallic decoration portion 10 have an appearance that is substantially the same as that of the metallic decoration portion 10. In addition, it is possible to improve the design by making the parts other than the metal decorative part 10 have another appearance such as wood grain. The position and size of the metal decorative portion 10 and the appearance of other portions may be appropriately set so that the design desired by the user is exhibited.

The decorative film 12 bonded to the decorated region 11 has a design surface 12a. The design surface 12a is a surface that can be visually recognized by the user who uses the mobile terminal 100, and is a surface that is one of the elements that configure the appearance (design) of the housing unit 101. In the present embodiment, the surface on the front surface side of the back surface portion 108 becomes the design surface 12 a of the decorative film 12. That is, the surface opposite to the bonding surface 12b (see FIG. 2) bonded to the decorated region 11 becomes the design surface 12a.

In the present embodiment, the design surface 12a corresponds to the first surface of the decorative portion. Further, the adhesive surface 12b (see FIG. 2) on the side opposite to the design surface 12a corresponds to the second surface on the side opposite to the first surface. The decorative film 12 is adhered to the decorated region 11 such that the design surface 12a is on the front surface side.

In the present embodiment, as the electronic component housed in the housing unit 101, the antenna unit 15 (see FIG. 2) capable of communicating with an external reader/writer or the like 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. Have. The specific configuration of the antenna unit 15 is not limited. Note that the electronic components housed in the casing 101 are not limited, and various electronic components such as IC chips and capacitors may be housed.

FIG. 2 is a schematic cross-sectional view showing a configuration example of the metal decoration portion 10. As described above, the metal decoration portion 10 is composed of the decorated area 11 formed in the area corresponding to the position of the antenna portion 15 and the like, and the decoration film 12 adhered to the decorated area 11. ..

The decorative film 12 has a base film 19, a metal layer 20, a sealing resin 21, and an adhesive layer 18.

The base film 19 is made of a material having transparency and stretchability, and a resin film is typically used. As a material of the base film 19, for example, PET (polyethylene terephthalate), PC (polycarbonate), PMMA (polymethylmethacrylate), PP (polypropylene) or the like is used. Other materials may be used.

Since the base film 19 is a layer in contact with a metal, if a vinyl chloride-based material is used, for example, free chlorine may accelerate the corrosion of the metal. Therefore, by selecting a non-vinyl chloride material as the base film 19, it is possible to prevent metal corrosion. Of course, it is not limited to this.

The surface of the base film 19, that is, the surface of the base film 19 opposite to the surface on the housing 101 side is the design surface 12 a of the decorative film 12. A protective layer, a printed image, etc. may be formed on the base film 19. In this case, the surface of the protective layer, the printing layer, or the like becomes the design surface 12a of the decorative film 12. Of course, the base film 19 may have a function as a protective layer. The base film 19 may be provided with a decoration function by printing, coloring, or the like. This makes it possible to improve the design.

In the present disclosure, the decoration function includes an arbitrary function for realizing a predetermined design property.
For example, an arbitrary decorating function such as a decorating function of expressing a predetermined color or the like by utilizing transmission or reflection of light, a decorating function of visually recognizing a predetermined pattern or pattern by using printing or the like can be given. To be Of course, the decorating function of visually recognizing a predetermined pattern or the like by using printing or the like can be said to be a decorating function using light transmission or reflection.

The metal layer 20 is formed so that the decorated region 11 has a metallic appearance. The metal layer 20 is a layer formed on the base film 19 by vacuum vapor deposition, and has a large number of fine cracks (hereinafter referred to as fine cracks) 22 formed therein.

A plurality of discontinuous surfaces are formed on the metal layer 20 due to the fine cracks 22, and the surface resistance value is almost in an insulating state. Therefore, it is possible to sufficiently suppress the generation of the eddy current when the radio wave hits the casing 101. As a result, reduction of electromagnetic wave energy due to eddy current loss can be sufficiently suppressed, and high radio wave transparency is realized.

The film thickness of the metal layer 20 is set in the range of 30 nm or more and 300 nm or less, for example. If the film thickness is too small, the light is transmitted, so that the reflectance in the visible light region is lowered. If the film thickness is too large, the surface shape is apt to be roughened, and the reflectance is lowered. Further, the smaller the film thickness, the greater the amount of decrease in reflectance after the high temperature and high humidity test (for example, after 75° C. 90% RH48H). RH is relative humidity (Relative Humidity).

By setting the film thickness within the above range in consideration of these points, it was possible to realize a radio wave transmitting surface that maintains high reflectance. In particular, by setting the film thickness in the range of 30 nm or more and 150 nm or less, high reflectance was sufficiently maintained and high radio wave transmission was exhibited. Of course, the thickness is not limited to these ranges, and the film thickness of the metal layer 20 may be appropriately set so that desired characteristics can be exhibited. In addition, for example, within the range of 30 nm or more and 300 nm or less, the optimum numerical range may be set again.

The sealing resin 21 functions as a protective layer (hard coat layer) that protects the metal layer 20. The sealing resin 21 is formed by applying, for example, a UV curable resin, a thermosetting resin, a two-component curable resin, or the like. By forming the sealing resin 21, for example, smoothing, antifouling, peeling prevention, scratch prevention, etc. are realized. The protective layer may be coated with acrylic resin or the like. By selecting a non-vinyl chloride material as the sealing resin 21, it is advantageous in preventing metal corrosion.

Further, the sealing resin 21 also has a function of fixing the fine cracks 22 in the metal layer 20 and preventing re-adhesion. That is, the sealing resin 21 also functions as a fixed layer. As a result, it becomes possible to exhibit sufficient radio wave transparency, and it is possible to maintain the radio wave transparency for a long time. A layer that functions as a protective layer and a layer that functions as a fixed layer may be formed separately from each other and may be formed on the metal layer 20 as a cover layer having a two-layer structure.

The adhesive layer 18 is a layer for adhering the decorative film 12 to the decorated region 11. The adhesive layer 18 is formed by applying an adhesive material to the surface of the sealing resin 21 opposite to the side covering the metal layer 20 (the surface on the side of the housing 101). The type of adhesive material and the coating method are not limited. The surface of the pressure-sensitive adhesive layer 18 that is bonded to the decorated region 11 becomes the bonding surface 12b of the decorative film 12.

In this embodiment, when the decorative film 12 is formed, first, the gloss film 23 including the base film 19 and the metal layer 20 is formed. After that, the sealing resin 21 and the adhesive layer 18 are formed on the glossy film 23. The order in which each layer is formed is not limited to this.

3 and 4 are photographs taken by enlarging the surface state of the metal layer 20 of the glossy film 23 with a microscope. Note that the photograph M2 shown in FIG. 4 was taken with the scale (scale) included, but in order to make it easier to recognize the scale, lines are reinforced from the top of the photograph. Of course, the photographs in FIGS. 3 and 4 are examples of the glossy film 23 according to the present technology.

In the glossy film 23 shown in the photograph M1 of FIG. 3, an aluminum layer to which oxygen is added as a predetermined element is formed as the metal layer 20 on the base film 19. Then, the base film 19 is biaxially stretched under the conditions of a stretching ratio (stretching amount with respect to the original size) of 2% and substrate heating of 130° C., whereby the fine cracks 22 are formed.

As shown in Photo M1, fine cracks 22 are formed on the metal layer 20 in a mesh shape along the biaxial direction. That is, the fine cracks 22 are formed so as to intersect with each other along two directions that are substantially orthogonal to each other.

In the glossy film 23 shown in the photograph M2 of FIG. 4, a metal layer 20 in which a high hardness layer made of chromium and a high reflection layer made of aluminum are laminated is formed on the base film 19. Then, the base film 19 is biaxially stretched under the conditions of a stretching rate of 2% and a substrate heating temperature of 130° C., whereby fine cracks 22 are formed.

As shown in Photo M2, fine cracks 22 are irregularly formed in the metal layer 20. The irregular formation means that the formation mode of the fine cracks 22 has no regularity, and it can be said that the fine cracks 22 are randomly formed.

As shown in Photo M2, there is no regularity in the direction of the fine cracks 22 and countless cracks 22 are formed in random directions. It can be said that there is no regularity in the shape of the region surrounded by the fine cracks 22 and a myriad of randomly shaped regions are formed by the fine cracks 22.

The pitch (crack interval) of the fine cracks 22 is set in the range of 1 μm or more and 500 μm or less, for example. When the pitch is reduced, the area of the gap (void) of the microcracks 22 relatively increases. When the pitch is increased, the area of the gap between the fine cracks 22 is relatively reduced.

For example, if the pitch is too small, a large amount of light reflected by the surface of the metal layer 20 is generated, which has an effect on design. On the other hand, when the pitch was too large, the radio wave transmittance was found to decrease. By setting the pitch in the range of 1 μm or more and 500 μm or less, it was possible to achieve radio wave transparency while maintaining high designability. For example, it becomes possible to sufficiently transmit an electromagnetic wave (wavelength of about 12.2 cm) of 2.45 GHz of WiFi or Bluetooth (registered trademark).

Of course, the pitch of the fine cracks 22 is not limited to this range, and may be appropriately set so that desired characteristics are exhibited. For example, by setting the pitch in the range of 50 μm or more and 200 μm or less, high reflectance and high radio wave transparency were sufficiently exhibited. In addition, for example, an optimum numerical range may be newly set within the range of 1 μm or more and 500 μm or less.

When the surface resistance of the metal layers 20 in Photos M1 and M2 was evaluated with a 4-probe resistor, it showed insulation. The surface reflectance (average reflectance) in the visible light region (400 nm to 700 nm) was measured with a spectrophotometer (U-4100 "Hitachi, Ltd."), and the value was 70% or more. .. That is, it is possible to realize the metal layer 20 having a metal glossy surface having a high reflectance and having sufficient radio wave transmission.

When the base film 19 is formed on the surface side of the metal layer 20 or when a protective layer such as a sealing resin or a hard coat layer is formed, the surface reflectance of the design surface 12a decreases by about 5%. Can be. Even considering this, by using the decorative film 12 according to the present technology, the surface reflectance can be set to a high value of 65% or more.

Compare the case where the fine cracks 22 are regularly formed as shown in FIG. 3 and the case where the fine cracks 22 are irregularly formed as shown in FIG. Then, it has been found that the visibility (the degree of conspicuity) of the fine cracks 22 can be reduced when the irregular cracks are formed. It is considered that this is because the fine cracks 22 are conspicuous when the directions of the fine cracks 22 are aligned.

Therefore, for example, by forming the glossy film 23 so that the fine cracks 22 are irregularly formed, it is possible to improve the designability of the design surface 12a.

FIG. 5 is a schematic diagram showing a configuration example of a vacuum vapor deposition device. The vacuum vapor deposition apparatus 200 has a film transport mechanism 201, a partition wall 202, a mounting table 203, and a heating source (not shown) arranged in a vacuum chamber (not shown).

The film transport mechanism 201 has a first roll 205, a rotating drum 206, and a second roll 207. When the rotary drum 206 rotates to the right, the base film 19 is conveyed from the first roll 205 to the second roll 207 along the peripheral surface of the rotary drum 206. When the rotary drum 206 rotates counterclockwise, the base film 19 is conveyed from the second roll 207 to the first roll 205.

The mounting table 203 is arranged at a position facing the rotary drum 206. On the mounting table 203, a crucible 208 containing a metal material forming the metal layer 20 formed on the base film 19 is arranged. A region of the rotary drum 206 facing the crucible 208 is a film forming region 210. The partition wall 202 regulates the fine particles 91 of the film-forming material 90 that advance at an angle toward the area other than the film-forming area 210.

The base film 19 is conveyed with the rotary drum 206 sufficiently cooled. For example, the rotating drum 206 is rotated clockwise, and the base film 19 is conveyed from the first roll 205 toward the second roll 207.

The metal material in the crucible 208 is heated by a heating source (not shown) such as a heater, a laser, or an electron gun in accordance with the conveyance of the base film 19. As a result, vapor containing fine particles 91 is generated from the crucible 208. By depositing the fine particles 91 of the metal material contained in the vapor on the base film 19 which advances through the film formation region 210, the metal layer 20 is formed on the base film 19.

For example, aluminum is contained in the crucible 208 as a metal material. An oxygen introduction mechanism (not shown) is arranged on the upstream side of the film formation region 210 (on the unwinding roll 205 side). Oxygen is blown toward the base film 19 by the oxygen introduction mechanism in accordance with the conveyance of the base film 19 and the heating of the crucible 208 by the heating source. This makes it possible to easily form the metal layer 20 made of the oxygen-added aluminum layer illustrated in FIG.

As another example, first, the crucible 208 containing the chromium that constitutes the high hardness layer is placed on the placing table 203. Then, the rotary drum 206 is rotated clockwise, and the base film 19 is conveyed from the first roll 205 toward the second roll 207. The crucible 208 is heated in accordance with the conveyance of the base film 19, and a high hardness layer made of chromium is formed on the base film 19.

Next, the crucible 208 containing aluminum, which is a metal forming the high-reflection layer, is mounted on the mounting table 203. The rotary drum 206 is rotated counterclockwise, and the base film 19 having the high hardness layer formed thereon is conveyed from the second roll 207 to the first roll 205. By heating the aluminum in the crucible 208 in accordance with the transportation, the high reflection layer is formed on the high hardness layer. This makes it possible to easily form the metal layer 20 in which the high hardness layer made of chromium and the high reflection layer made of aluminum are laminated as illustrated in FIG.

In the example shown in FIG. 5, continuous vacuum deposition by the roll-to-roll method is possible, so it is possible to significantly reduce costs and improve productivity. Of course, the present technology can be applied even when a batch-type vacuum vapor deposition apparatus is used.

FIG. 6 is a schematic diagram showing a configuration example of a biaxial stretching device. The biaxial stretching device 250 includes a base member 251 and four stretching mechanisms 252 arranged on the base member 251 and having substantially the same configuration. The four stretching mechanisms 252 are arranged so that two of each of the two axes (x axis and y axis) orthogonal to each other are opposed to each other on each axis. Hereinafter, description will be given with reference to the stretching mechanism 252a that stretches the glossy film 23' in the direction opposite to the arrow in the y-axis direction.

The stretching mechanism 252a has a fixed block 253, a movable block 254, and a plurality of clips 255. The fixed block 253 is fixed to the base member 251. A stretching screw 256 extending in the stretching direction (y direction) penetrates through the fixed block 253.

The movable block 254 is movably arranged on the base member 251. The movable block 254 is connected to an extension screw 256 penetrating the fixed block 253. Therefore, by operating the extension screw 256, the movable block 254 can be moved in the y direction.

The plurality of clips 255 are arranged along the direction (x direction) orthogonal to the stretching direction. A slide shaft 257 extending in the x direction penetrates each of the plurality of clips 255. The position of each clip 255 can be changed along the slide shaft 257 in the x direction. Each of the plurality of clips 255 and the movable block 254 are connected by a connecting link 258 and a connecting pin 259.

Draw ratio is controlled by the operation amount of draw screw 256. The stretching ratio can also be controlled by appropriately setting the number and positions of the plurality of clips 255, the length of the connecting link 258, and the like. The configuration of the biaxial stretching device 250 is not limited. The biaxial stretching device 250 according to the present embodiment biaxially stretches a film by full-cut sheets, but it is also possible to continuously roll biaxially with a roll. For example, continuous biaxial stretching is possible by applying tension in the running direction between the rolls and a clip 255 provided between the rolls and moving in synchronization with the running to give tension perpendicular to the running direction.

The gloss film 23' after vacuum deposition is arranged on the base member 251, and a plurality of clips 255 of the stretching mechanism 252 are attached to each of the four sides. Biaxial stretching is performed by operating the four stretching screws 256 while the gloss film 23' is heated by a temperature-controlled heating lamp or a temperature-controlled hot air (not shown). In this embodiment, the base film 19 is biaxially stretched under the conditions of a stretching rate of 2% in each axial direction and substrate heating of 130°C. As a result, as shown in FIG. 3, mesh-like fine cracks 22 are formed along the direction (biaxial direction) orthogonal to the stretching direction. Alternatively, as shown in FIG. 4, fine cracks 22 are irregularly formed.

If the stretching ratio is too low, appropriate fine cracks 22 will not be formed, and the metal layer 20 will have conductivity. In this case, due to the influence of eddy current and the like, sufficient radio wave transmission cannot be exhibited. On the other hand, if the stretching ratio is too large, damage to the base film 19 after stretching becomes large. As a result, when the decorative film 12 is bonded to the decorated region 11, the yield may be deteriorated due to the trapping of air or the generation of wrinkles. Further, the design of the metal decorative portion 10 may be deteriorated due to the deformation of the base film 19 and the metal layer 20 itself. This problem can also occur when the metal layer 20 is peeled from the base film 19 and transferred.

In the glossy film 23 according to the present embodiment, the fine cracks 22 can be properly formed at a low stretch ratio of 2% or less in each axis direction. This makes it possible to sufficiently prevent damage to the base film 19 and improve the yield. In addition, the design of the metal decoration portion 10 to which the decoration film 12 is bonded can be maintained high. Of course, the stretching ratio can be appropriately set, and if the above-mentioned problems do not occur, a stretching ratio of 2% or more may be set. For example, if the stretching ratio is in the range of 5% or less, it is possible to properly form the fine cracks 22 with a high yield without causing the above problems. Of course, a value larger than 5% may be set.

[Gap of fine cracks and design]
Here, the inventor examined the gap between the fine cracks 22 and the designability of the design surface 12a. Specifically, the light transmittance of the gap between the fine cracks 22 and the designability of the design surface 12a were examined.

For example, in the decorative film 12 illustrated in FIG. 2, the sealing resin 21 is made of a transparent material having high light transmittance. As a result, the gap between the fine cracks 22 becomes a region having light transparency. In this case, when the design surface 12a is irradiated with light from the outside, the light is transmitted through the gaps of the fine cracks 22, so that the reflectance of the design surface 12a may decrease. As a result, it may be difficult to realize a metallic luster having a high design property.

Further, when the light generated inside the housing 101 is emitted to the outside, there is a possibility that the light may pass through the gaps of the fine cracks 22 and leak. In this case, there is a possibility that the designability may be deteriorated due to the influence of leaked light emitted from the gap of the fine crack 22.

From such a study, the inventor newly devised to realize the following points in order to improve the designability.
(A) Sufficiently suppressing the light that passes through the gaps of the microcracks 22 (B) Controlling the influence of the light incident on the gaps of the microcracks 22 on the designability (C) Combining these two points Hereinafter, these points (A) to (C) will be described.

[About point A]
In order to achieve the point A, the inventor configures a light shielding portion that shields light in at least one of the gap between the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). Was newly devised. In particular, a light blocking portion that blocks light in the visible light region is configured.

Note that the light blocking in the present disclosure is not limited to the case of completely blocking light as in the case of complete light blocking, and also includes the case of allowing light transmission within a range that does not impair the effects of the present technology. Further, the light shielding in the present disclosure is a concept including absorbing light and reflecting light. For example, the light shielding in the present disclosure can be expressed as the light transmittance being equal to or less than a predetermined threshold value (for example, 10%). Of course, it is not limited to this.

In the decorative film 12 illustrated in FIG. 2, the sealing resin 21 is formed of a light shielding material having a light shielding property. This makes it possible to fill the gaps between the fine cracks 22 with the light-shielding material. In addition, a layer made of a light shielding material can be realized between the metal layer 20 and the adhesive surface 12b.

As shown in FIG. 2, the light-shielding material formed in the gaps of the fine cracks 22 is hereinafter referred to as a gap light-shielding portion 31. A layer of light-shielding material formed between the metal layer 20 and the adhesive surface 12b is referred to as a light-shielding layer 32.

For example, the gloss film 23 is formed, and the fine cracks 22 are formed by stretching. After that, a resin made of a light shielding material is applied so as to cover the metal layer 20 to form the sealing resin 21. This makes it possible to easily form the gap light-shielding portion 31 and the light-shielding layer 32 integrally. In the example shown in FIG. 2, the light shielding portion 30 is configured by the sealing resin 21 that functions as the gap light shielding portion 31 and the light shielding layer 32.

By configuring the light-shielding portion 30, it is possible to sufficiently suppress the light that passes through the gaps between the fine cracks 22 and realize a metallic luster having a high reflectance. Further, it becomes possible to sufficiently suppress unnecessary leakage light from the inside of the casing 101. As a result, it is possible to realize extremely high designability.

As shown in FIG. 2, the state where the sealing resin 21 is formed on the metal layer 20 so as to fill the gaps of the fine cracks 22 is formed so that the sealing resin 21 is the same layer as the metal layer 20. It can also be said that it is in the state of being.

7 and 8 are schematic diagrams showing another configuration example of the light shielding unit. For example, as shown in FIG. 7A, the sealing resin 21 functioning as the light shielding portion 30 can be provided with an adhesive function. As a result, the adhesive layer 18 can be omitted, and the manufacturing process can be simplified.

As shown in FIG. 7B, only the gap light-shielding portion 31 may be configured as the light-shielding portion 30. For example, the gloss film 23 is formed, and the fine cracks 22 are formed by stretching. After that, by applying a light-shielding material so as to fill the gaps of the fine cracks 22, the gap light-shielding portions 31 are formed. Then, the sealing resin 21 is formed by applying a resin so as to cover the metal layer 20 and the gap light-shielding portion 31. The sealing resin 21 is formed of a material that does not have a light shielding property.

Even with such a configuration, the light-shielding portion 30 can sufficiently suppress the light that passes through the gaps of the fine cracks 22 and sufficiently suppress unnecessary leaked light from the inside. As a result, it is possible to realize extremely high designability. When the sealing resin 21 is formed of a light blocking material, it can function as the light blocking layer 32.

Note that, as shown in FIG. 7B, the state in which the gap light-shielding portion 31 is formed in the gap between the fine cracks 22 may be referred to as the state in which the gap light-shielding portion 31 is formed so as to be in the same layer as the metal layer 20. It is possible.

As shown in FIG. 7C, only the light shielding layer 32 may be configured as the light shielding unit 30. For example, after the fine cracks 22 are formed by stretching, the sealing resin 21 is formed so as to cover the metal layer 20. The light-shielding material 32 is applied to the surface of the sealing resin 21 opposite to the side covering the metal layer 20 to form the light-shielding layer 32. The adhesive layer 18 is formed on the light shielding layer 32.

When only the light shielding layer 32 is formed, it is difficult to suppress the light radiated from the outside to the design surface 12 a from passing through the gaps of the fine cracks 22. On the other hand, it is possible to sufficiently suppress unnecessary leaked light from the inside. That is, it is possible to sufficiently suppress the light transmitted from the inside through the gap of the fine crack 22. As a result, it is possible to improve the design.

As shown in FIG. 8A, as the light shielding unit 30, the gap light shielding unit 31 and the light shielding layer 32 may be separately configured. For example, after the fine cracks 22 are formed by stretching, the light-shielding material is applied so as to fill the gaps between the fine cracks 22 to form the gap light-shielding portions 31. Then, after the sealing resin 21 is formed, the light shielding layer 32 is formed by applying a light shielding material to the surface of the sealing resin 21 opposite to the side covering the metal layer 20. Even with such a configuration, high designability can be realized.

In the example shown in FIG. 8B, the adhesive layer 18 is formed on the surface of the base film 19 opposite to the surface on which the metal layer 20 is formed. Then, the base film 19 side of the decorative film 12 is bonded to the decorated region 11 of the housing 101. Therefore, the surface of the sealing resin 21 opposite to the side covering the metal layer 20 becomes the design surface 12 a of the decorative film 12.

In such a structure, the base film 19 is formed of a light shielding material. As a result, the light shielding layer 32 can be easily formed as the light shielding portion 30. As a result, unnecessary leakage of light from the inside can be sufficiently suppressed, and high designability can be realized.

Note that the adhesive layer 18 and the sealing resin 21 may be omitted depending on the molding conditions of the housing 101 and the like. In this case, the gloss film 23 is bonded to the decorated region 11 as a decorative film according to the present technology.

In FIG. 8B, the light shielding portion 30 is realized by the base film 19. Of course, the present invention is not limited to this, and as shown in FIG. 8C, the gap light-shielding portion 31 and the light-shielding layer 32 may be newly added.

The gap light-shielding portion 31 is formed by applying the light-shielding material so as to fill the gaps between the fine cracks 22 after the fine cracks 22 are formed by stretching, for example. The light-shielding material 32 is applied to the surface of the base film 19 opposite to the surface on which the metal layer 20 is formed, whereby the light-shielding layer 32 is formed. Even with such a configuration, high designability can be realized. Of course, only one of the gap light-shielding portion 31 and the light-shielding layer 32 may be formed.

Any material may be used as the light-shielding material used to realize the light-shielding portion 30 (the gap light-shielding portion 31, the light-shielding layer 32). Of course, when the light-shielding portion 30 is realized by an element having other functions such as the sealing resin 21 and the base film 19, the material may be appropriately selected so that the other functions are also exhibited.

As described with reference to FIG. 2, FIG. 7 and FIG. 8, the light shielding portion 30 is formed in at least one of the gaps of the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). To do. Specifically, the light-shielding portion 30 formed on at least one of the metal layer 20 in which the fine cracks 22 are formed and the gap between the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). The decorative film 12 including and is formed. This makes it possible to suppress the light transmitted through the gaps of the fine cracks 22. As a result, it is possible to realize the housing portion 101 having a metallic appearance and a high design property that allows transmission of radio waves.

[About point B]
In order to realize the point B, the inventor provides a decorating function portion having a decorating function in at least one of the gap between the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). Invented to make up anew. Specifically, a decoration function unit having a decoration function using at least one of transmission and reflection of light is configured.

As the decoration function unit having a decoration function using the transmission or reflection of light, the transmitted light transmitted through the decoration function unit or the reflected light reflected by the decoration function unit is used to realize a predetermined design property. It includes any configuration capable of functioning.

For example, a light-transmissive member or layer that is colored with a predetermined color can function as a decorative function unit that can express the color. Further, it has a laminated structure, and the light emitted from one layer by transmission or reflection causes interference by the other layer. By utilizing this light interference, it is possible to achieve a predetermined design property such as color adjustment. A member, layer, or the like having such a laminated structure can function as a decoration function unit. In addition, the print layer and the like can also function as the decoration function unit.

In the decorative film 12 illustrated in FIG. 9, the sealing resin 21 is formed as the decorative function part 40 having a decorative function. This makes it possible to fill the gaps between the fine cracks 22 with a material having a decorating function. In addition, a layer made of a material having a decorating function can be realized between the metal layer 20 and the adhesive surface 12b.

As shown in FIG. 9, hereinafter, a material having a decoration function part formed in the gap of the fine crack 22 is referred to as a gap decoration function part 41. A layer having a decorative function diagram formed between the metal layer 20 and the adhesive surface 12b is referred to as a decorative function layer 42. In the decorative film 12 illustrated in FIG. 2, the configuration illustrated in FIG. 9 includes the light-shielding portion 30 (the gap light-shielding portion 31, the light-shielding layer 32), the decoration function portion 40 (the gap decoration function portion 41, the decoration This corresponds to the one obtained by replacing the functional layer 42). Of course, the configuration is not limited to this.

For example, the gloss film 23 is formed, and the fine cracks 22 are formed by stretching. After that, a resin made of a material having a decorating function is applied so as to cover the metal layer 20 to form the sealing resin 21. This makes it possible to easily form the gap decoration function part 41 and the decoration function layer 42 integrally. In the example shown in FIG. 9, the sealing resin 21 that functions as the gap decoration function section 41 and the decoration function layer 42 configures the decoration function section 40.

By configuring the decoration function unit 40, light that enters the gap between the fine cracks 22 from the outside and light that enters the gap between the fine cracks 22 from the inside is positively used to improve the design. It becomes possible.

For example, it is possible to improve the designability of the design surface 12a by using the transmitted light that passes through the decoration function part 40 (the gap decoration function part 41 and the decoration function layer 42). Further, it is possible to improve the designability of the design surface 12a by using the reflected light reflected by the decoration function part 40 (the gap decoration function part 41, the decoration function layer 42). In addition, it is also possible to reflect the light transmitted through the gap decoration function unit 41 by the decoration function layer 42 and transmit the light through the gap decoration function unit 41 again.

Specifically, as a design example (design example), a design in which the fine cracks 22 are colored, or a design in which light decorated from the fine cracks 22 is transmitted is considered. Of course, it is not limited to such a design.

By configuring the decoration function section 40 in this way, it is possible to control the influence of the light incident on the gaps of the microcracks 22 on the design. As a result, it is possible to realize extremely high designability. Since the decorative function section 40 is formed in the same layer or a back layer (inner layer) with respect to the metal layer 20, it is easy to arrange the metal layer 20 on the front surface side (design surface side). Become. As a result, it is possible to realize a metallic luster having a high reflectance.

10 and 11 are schematic diagrams showing another configuration example of the decoration function unit. The configuration illustrated in FIGS. 10 and 11 corresponds to the decorative film 12 illustrated in FIGS. 7 and 8 in which the light shielding unit 30 is replaced with the decorative function unit 40. Hereinafter, these configurations will be described again.

For example, as shown in FIG. 10A, the sealing resin 21 functioning as the decoration function unit 40 can be provided with an adhesive function. As a result, the adhesive layer 18 can be omitted, and the manufacturing process can be simplified.

As shown in FIG. 10B, only the gap decoration function unit 41 may be configured as the decoration function unit 40. For example, the gloss film 23 is formed, and the fine cracks 22 are formed by stretching. Thereafter, a material having a decorating function is applied so as to fill the gaps between the fine cracks 22 to form the gap decorating function part 41. Then, the sealing resin 21 is formed by applying a resin so as to cover the metal layer 20 and the gap decoration function part 41. The sealing resin 21 is formed of a material having no decoration function.

Even with such a configuration, the decorative function unit 40 positively utilizes light that enters the gap between the fine cracks 22 from the outside and light that enters the gap between the fine cracks 22 from the inside to improve the design. It is possible to improve. When the sealing resin 21 is made of a material having a decoration function, it can function as the decoration function layer 42.

As shown in FIG. 10C, only the decorative function layer 42 may be configured as the decorative function unit 40. For example, after the fine cracks 22 are formed by stretching, the light-transmitting sealing resin 21 is formed so as to cover the metal layer 20. The decorative functional layer 42 is formed by applying a material having a decorative function to the surface of the sealing resin 21 opposite to the side covering the metal layer 20. The adhesive layer 18 is formed on the decorative functional layer 42.

Even with such a configuration, it is possible to improve the design by positively utilizing the light that enters the gap between the fine cracks 22 from the outside and the light that enters the gap between the fine cracks 22 from the inside. ..

As shown in FIG. 11A, as the decoration function section 40, the gap decoration function section 41 and the decoration function layer 42 may be separately configured. For example, after the fine cracks 22 are formed by stretching, a material having a decorating function is applied so as to fill the gaps between the fine cracks 22 to form the gap decorating function part 41. Then, after the sealing resin 21 is formed, a decorative function layer 42 is formed by applying a material having a decorative function to the surface of the sealing resin 21 opposite to the side covering the metal layer 20. Even with such a configuration, high designability can be realized.

In the example shown in FIG. 11B, the adhesive layer 18 is formed on the surface of the base film 19 opposite to the surface on which the metal layer 20 is formed. Then, the base film 19 side of the decorative film 12 is bonded to the decorated region 11 of the housing 101. Therefore, the surface of the sealing resin 21 opposite to the side covering the metal layer 20 becomes the design surface 12 a of the decorative film 12.

In such a structure, the base film 19 is formed of a material having a decorating function. As a result, the decorative function layer 42 can be easily formed as the decorative function section 40. As a result, it is possible to improve the design by positively utilizing the light that enters the gap between the fine cracks 22 from the outside and the light that enters the gap between the fine cracks 22 from the inside.

In FIG. 11B, the decorative function unit 40 is realized by the base film 19. Of course, the present invention is not limited to this, and as shown in FIG. 11C, the gap decoration function part 41 and the decoration function layer 42 may be newly added.

For example, after the fine cracks 22 are formed by stretching, a material having a decorating function is applied so as to fill the gaps between the fine cracks 22 to form the gap decorating function part 41. The decorative function layer 42 is formed by applying a material having a decorative function to the surface of the base film 19 opposite to the surface on which the metal layer 20 is formed. Even with such a configuration, high designability can be realized. Of course, only one of the gap decoration function part 41 and the decoration function layer 42 may be formed.

Any material may be used as a material having a decorating function used to realize the decorating functional unit 40 (the gap decorating functional unit 41, the decorating functional layer 42). Of course, when the decorative function section 40 is realized by an element having another function such as the sealing resin 21 and the base film 19, the material may be appropriately selected so that the other function is also exhibited.

As described with reference to FIG. 9, FIG. 10 and FIG. 11, the decoration function part 40 is provided in at least one of the gaps of the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). Make up. Specifically, the decorating function configured in at least one of the metal layer 20 in which the fine cracks 22 are formed and the gap between the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). The decorative film 12 including the part 40 is formed. This makes it possible to improve the design by positively utilizing the light that enters the gap between the fine cracks 22 from the outside and the light that enters the gap between the fine cracks 22 from the inside. As a result, it is possible to realize the housing portion 101 having a metallic appearance and a high design property that allows transmission of radio waves.

[About point C]
FIG. 12 is a schematic diagram showing a configuration example in which the light shielding unit 30 and the decoration function unit 40 are combined. In the example shown in FIG. 12A, after the fine cracks 22 are formed by stretching, for example, a material having a decorating function is applied so as to fill the gaps between the fine cracks 22 so that the gap decorating function part 41 decorates. It is formed as the functional unit 40. Then, after the sealing resin 21 is formed, a light shielding material is applied to the surface of the sealing resin 21 opposite to the side covering the metal layer 20, so that the light shielding layer 32 is formed as the light shielding portion 30.

By combining the light shielding unit 30 and the decoration function unit 40 in this manner, it becomes possible to sufficiently suppress unnecessary leakage light from the inside of the housing unit 101. Further, it becomes possible to control the influence of the light incident on the gap of the fine crack 22 from the outside on the design. As a result, high designability can be realized.

The sealing resin 21 may be formed of a material having a decorating function, and the light shielding layer 32 may be formed on the back layer (layer on the inner side) of the sealing resin 21. In this case, the gap decoration function part 41, the decoration function layer 42, and the light shielding layer 32 can be easily formed. Alternatively, the sealing resin 21 may be formed as the light shielding layer 32 of a light shielding material after forming the gap decoration function portion 41.

A combination of the decorative functional layer 42 and the light shielding layer 32 is also possible. For example, the decorative functional layer 42 is formed on the back layer (inner layer) of the sealing resin 21. Then, the light shielding layer 32 may be formed on the back layer (layer on the inner side) of the decorative function layer 42. Besides, any configuration may be adopted.

In the example shown in FIG. 12B, for example, after the fine cracks 22 are formed by stretching, a material having a decorating function is applied so as to fill the gaps between the fine cracks 22 so that the gap decorating function unit 41 decorates. It is formed as the functional unit 40. Further, the light-shielding material is applied to the surface of the base film 19 opposite to the surface on which the metal layer 20 is formed, whereby the light-shielding layer 32 is formed as the light-shielding portion 30. Even with such a configuration, high designability can be realized.

The base film 19 may be formed of a material having a decorating function, and the light shielding layer 32 may be formed on the back layer (layer on the inner side) of the base film 19. In this case, the gap decoration function part 41, the decoration function layer 42, and the light shielding layer 32 can be easily formed. Alternatively, the base film 19 may be formed of a light-shielding material, and the gap decoration function part 41 may be formed in the gap between the fine cracks 22.

A combination of the decorative functional layer 42 and the light shielding layer 32 is also possible. For example, the decorative functional layer 42 is formed on the back layer (inner layer) of the base film 19. Then, the light shielding layer 32 may be formed on the back layer (layer on the inner side) of the decorative function layer 42. Besides, any configuration may be adopted.

As described with reference to FIG. 12, the light shielding portion 30 is formed in at least one of the gaps between the fine cracks 22 or between the metal layer 20 and the adhesive surface 12b (second surface). Further, the decorating function part 40 is formed in at least one of the gap between the fine cracks 22 or between the metal layer 20 and the bonding surface 12b (second surface). That is, the light shielding unit 30 and the decoration function unit 40 are combined. As a result, it is possible to realize the housing portion 101 having a metallic appearance and a high design property that allows transmission of radio waves.

FIG. 13 is a schematic diagram for explaining the in-mold molding method. The in-mold molding is performed by a molding device 300 having a cavity mold 301 and a core mold 302 as shown in FIG. As shown in FIG. 13A, the cavity mold 301 is provided with a recess 303 corresponding to the shape of the casing 101. The transfer film 50 is arranged so as to cover the recess 303. The transfer film 50 is formed by adhering the decorative film 12 shown in FIG. The transfer film 50 is supplied from the outside of the molding apparatus 300 by, for example, a roll-to-roll method.

As shown in FIG. 13B, the cavity mold 301 and the core mold 302 are clamped, and the molding resin 55 is injected into the recess 303 through the gate portion 306 formed on the core mold 302. The cavity mold 301 is formed with a sprue portion 508 to which the molding resin 55 is supplied and a runner portion 509 connected to the sprue portion 508. When the cavity mold 301 and the core mold 302 are clamped, the runner portion 509 and the gate portion 306 are connected. As a result, the molding resin 55 supplied to the sprue portion 508 is injected into the recess 303. The structure for injecting the molding resin 55 is not limited.

As the molding resin 55, for example, a general-purpose resin such as ABS (acrylonitrile-butadiene-styrene) resin, a PC resin, an engineering plastic such as a mixed resin of ABS and PC, and the like are used. The material and color (transparency) of the molding resin may be appropriately selected so as to obtain a desired housing part (housing part) without being limited thereto.

The molding resin 55 is injected into the recess 303 while being melted at a high temperature. The molding resin 55 is injected so as to press the inner surface of the recess 303. At this time, the transfer film 50 disposed in the recess 303 is pressed by the molding resin 55 to be deformed. The adhesive layer 18 formed on the transfer film 50 is melted by the heat of the molding resin 55, and the decorative film 12 is bonded to the surface of the molding resin 55.

After the molding resin 55 is injected, the cavity mold 301 and the core mold 302 are cooled and the clamp is released. The molding resin 55 to which the decorative film 12 is transferred is attached to the core mold 302. By taking out the molding resin 55, the housing 101 in which the metal decorative portion 10 is formed in a predetermined region is manufactured. The carrier film 51 is peeled off when the clamp is released.

By using the in-mold molding method, the positioning of the decorative film 12 becomes easy, and the metal decorative portion 10 can be easily formed. Further, the degree of freedom in designing the shape of the casing 101 is high, and the casing 101 having various shapes can be manufactured.

The antenna unit 15 housed inside the housing unit 101 may be attached by an in-mold molding method when the housing unit 101 is molded. Alternatively, the antenna unit 15 may be attached to the inside of the housing unit 101 after the housing unit 101 is molded. In addition, the antenna unit 15 may be built in the housing.

FIG. 14 is a schematic diagram for explaining the insert molding method. In insert molding, the decorative film 12 is arranged as an insert film in the cavity mold 351 of the molding device 350. Then, as shown in FIG. 14B, the cavity mold 351 and the core mold 352 are clamped, and the molding resin 55 is injected into the cavity mold 351 via the gate portion 356. As a result, the casing 101 is formed integrally with the decorative film 12. The metal decoration portion 10 can be easily formed by using the insert molding method. In addition, the casing 101 having various shapes can be manufactured. The configuration of the molding device that performs in-mold molding and insert molding is not limited.

FIG. 15 is a schematic diagram showing a configuration example of a transfer film including a base film and a metal layer. The transfer film 450 includes a base film 419, a peeling layer 481, a hard coat layer 482, a metal layer 420, a sealing resin 421, and an adhesive layer 418. The peeling layer 481 and the hard coat layer 482 are formed on the base film 419 in this order.

Therefore, the metal layer 420 is formed on the base film 419 on which the peeling layer 481 and the hard coat layer 482 are formed. Then, by stretching the base film 419, fine cracks 422 are formed in the metal layer 420.

Note that, in the example shown in FIG. 15, the sealing resin 421 is configured as a light shielding portion or a decoration function portion. Of course, it is not limited to such a configuration.

As shown in FIG. 15B, when the housing 101 is formed by the in-mold molding method, the base film 419 and the peeling layer 481 are peeled off, and the metal layer 420 and the light shielding portion (or the decoration function portion) are included. The decorative portion 412 is bonded to the decorated region 411. Thus, the base film 419 may be used as a carrier film. The base film 419 on which the peeling layer 481 is formed can be regarded as the base film according to the present technology. The decorative portion 412 separated from the base film 419 can also be referred to as a decorative film.

In the example shown in FIG. 15, the vapor deposition start surface of the metal layer 420 is the design surface 412a side, and the vapor deposition end surface is the adhesion surface 412b side. Instead of this configuration, the transfer film may be formed so that the vapor deposition end surface becomes the design surface 412a side and the vapor deposition start surface becomes the adhesive surface 412b side surface.

A decorative film (decorative part) including the metal layer 20 and the light shielding part (or the decorative functional part) in the decorated region 11 by the hot stamping method using the

transfer films

50 and 450 shown in FIGS. 13 and 15. )12 may be transferred to form the casing 101. Alternatively, the decorative film 12 may be adhered to the housing 101 by an arbitrary method such as sticking. Further, vacuum forming, pressure forming and the like may be used.

The metal material to which the present technology can be applied is not limited to aluminum, and other metal materials such as silver (Ag) may be used. For example, by adding oxygen, the fine cracks 22 can be properly formed at a draw ratio of 2% or less, and the metal layer 20 having a reflectivity of 70% or more can be realized.

It is also possible to use aluminum, titanium, chromium, or an alloy containing at least one of these as the metal material. These metals are so-called valve metals, and it becomes possible to sufficiently exert the effect of preventing oxidation by the oxide film. As a result, high designability can be maintained for a long time.

The element to be added is not limited to oxygen, and nitrogen (N) may be added, for example. For example, instead of the oxygen introduction mechanism, a nitrogen introduction mechanism may be arranged and nitrogen may be blown as the introduction gas. For example, the supply amount may be appropriately set within a range from the addition amount at which the surface of the metal film becomes insulating after the stretching step to the nitriding of the metal layer. For example, high designability is exhibited by changing the addition concentration of nitrogen in the film thickness direction. Further, by setting the ratio of the metal that has not been combined with nitrogen in the vicinity of both surfaces of the metal layer to a predetermined threshold value or more, it becomes possible to prevent the progress of nitriding. Note that other elements may be added.

When a thin film having an island structure of In or Sn is used as a metal film that transmits radio waves, the reflectance is about 50% to 60%. This is due to the optical constants of the materials, and it is very difficult to realize a reflectance of 70% or more like the gloss film 23 according to this embodiment. Further, In is a rare metal, so that material cost is required.

Also, it is difficult to achieve a reflectance of 70% or higher even when cracking occurs in a metal film such as nickel or copper by performing after-baking using electroless plating. It is also conceivable to generate radio wave transparency by alloying silicon with a metal and increasing the surface resistivity, but in this case as well, it is difficult to achieve a reflectance of 70% or more.

Further, in the present embodiment, since a film of a metal material is formed by vacuum deposition, it is possible to use a material such as Al or Ti that is difficult to form on a resin by wet plating such as electroless plating. Therefore, the selection range of usable metal materials is very wide, and metal materials having high reflectance can be used. Further, since the fine cracks 22 are formed by biaxial stretching, it is possible to form the metal layer 20 with high adhesion in vacuum vapor deposition. As a result, during in-mold molding or insert molding, it is possible to properly mold the casing 101 without the metal layer 20 flowing down. Further, the durability of the metal decoration portion 10 itself can be improved.

In addition, in the present embodiment, since it is possible to use a simple vapor deposition process with a simple vapor deposition source configuration, it is possible to suppress equipment costs and the like. Note that the method for forming the metal layer to which oxygen or nitrogen is added is not limited to the case of blowing a gas toward the film transport mechanism 201. For example, the metal material in the crucible may contain oxygen or the like.

-This technology can be applied to almost all electronic devices that have a built-in antenna and the like housed inside. For example, such electronic devices include mobile phones, smartphones, personal computers, game machines, digital cameras, audio devices, TVs, projectors, car navigation systems, GPS terminals, wearable information devices (glasses type, wristband type), and other electronic devices. There are various types such as a remote controller for operating the vehicle by wireless communication or the like, an operating device such as a mouse or a touch pen, an electronic device provided in the vehicle such as an in-vehicle radar or an in-vehicle antenna. It is also applicable to IoT devices connected to the Internet or the like.

Also, the present technology is not limited to housing parts such as electronic devices, but can be applied to vehicles and buildings. That is, the structure including the decorative portion according to the present technology and the member having the decorated region to which the decorative portion is bonded may be used for all or part of a vehicle or a building. As a result, it is possible to realize a vehicle or a building having a wall surface or the like that can transmit radio waves while having a metallic appearance, and it is possible to exhibit extremely high designability. The vehicle includes any vehicle such as a car, a bus, and a train. The building includes any building such as a detached house, an apartment house, a facility, and a bridge.

<Other embodiments>
The present technology is not limited to the embodiments described above, and various other embodiments can be realized.

It is also possible to provide the casing 101 illustrated in FIG. 2 and the like with the functions of a light-shielding portion and a decoration function portion. Even in this case, high designability can be realized.

Regarding the application of the present technology, the method for forming the fine cracks 22 is not limited. For example, even when a thin film having an island structure of In or Sn is used, or when a crack is generated in a metal film such as nickel or copper by performing post-baking using electroless plating, the present technique The designability can be improved by configuring the light-shielding portion and the decoration function portion according to the above.

FIG. 16 is a sectional view showing a configuration example of a glossy film according to another embodiment. In the gloss film 523, the support layer 550 having a tensile breaking strength smaller than that of the metal layer 520 is provided as a layer that supports the metal layer 520. As a result, it became possible to reduce the stretching ratio required for forming the fine cracks 522. For example, it is possible to form the fine cracks 522 at a draw ratio smaller than the draw ratio required to break the metal layer 520 itself (mainly the high hardness layer etc.). It is considered that this is because, as shown in FIGS. 16A and 16B, the metal layer 520 ruptures following the rupture of the surface of the support layers 550A and 550 having low tensile rupture strength.

As shown in FIG. 16A, a base film having a small tensile breaking strength may be used as the supporting layer 550A. For example, the tensile breaking strength of biaxially stretched PET is about 200 to about 250 MPa, which is often higher than the tensile breaking strength of the metal layer 520.

On the other hand, the tensile breaking strengths of unstretched PET, PC, PMMA, and PP are as follows.
Unstretched PET: Approx. 70 MPa
PC: About 69 to about 72 MPa
PMMA: About 80 MPa
PP: about 30 to about 72 MPa
Therefore, by using the base film made of these materials as the support layer 550A, it becomes possible to properly form the fine cracks 522 with a low stretching rate. By selecting a non-vinyl chloride material as the support layer 550A, it is advantageous to prevent metal corrosion.

As shown in FIG. 16B, as the support layer 550B, a coating layer may be formed on the base film 519. For example, by coating an acrylic resin or the like to form the hard coat layer, the hard coat layer can be easily formed as the support layer 550B.

By forming a coating layer having a small tensile breaking strength between the base film 519 having a large tensile breaking strength and the metal layer 520, while maintaining the durability of the glossy film 523B at a high level, fine cracks 522 due to a low stretching ratio are formed. The formation can be realized. It is also effective when PET must be used in the manufacturing process. Note that the base film or the hard coat layer functioning as the supporting layers 550A and 550 shown in FIGS. 16A and 16B has a very small surface rupture such that the width of the microcracks 522 is very small. Therefore, it does not cause trapping of air or deterioration of design.

FIG. 17 is a diagram showing the relationship between the thickness of the coating layer formed as the support layer 550B and the pitch (crack interval) of the fine cracks 522 formed in the metal layer 520. FIG. 17 shows the relationship when an acrylic layer is formed as a coating layer.

As shown in FIG. 17, when the thickness of the acrylic layer was 1 μm or less, the pitch of the fine cracks 522 was 50 μm to 100 μm. On the other hand, when the thickness of the acrylic layer was set in the range of 1 μm to 5 μm, the pitch of the fine cracks 522 was 100 μm to 200 μm. As described above, it was found that the pitch of the fine cracks 522 increased as the thickness of the acrylic layer increased. Therefore, by appropriately controlling the thickness of the acrylic layer, the pitch of the fine cracks 522 can be adjusted. For example, by setting the thickness of the acrylic layer to be 0.1 μm or more and 10 μm or less, the thickness of the fine cracks 522 can be adjusted within a desired range. Of course, the range is not limited to this range, and for example, an optimum numerical range may be newly set within a range of 0.1 μm or more and 10 μm or less.

Note that, in the configuration described with reference to FIGS. 16 and 17, any configuration may be adopted in order to realize the light shielding unit and the decoration function unit.

Extending for forming fine cracks is not limited to biaxial stretching. Uniaxial stretching or triaxial or more stretching may be performed. Further, the base film 19 wound on the second roll 207 shown in FIG. 5 may be biaxially stretched by a roll-to-roll method. After further vacuum deposition, biaxial stretching may be performed before being wound on the second roll 207.

It is also possible to combine at least two characteristic parts among the characteristic parts according to the present technology described above. That is, the various characteristic portions described in each embodiment may be arbitrarily combined without distinguishing each embodiment. Further, the various effects described above are merely examples and are not limited, and other effects may be exhibited.

Note that the present technology can also take the following configurations.
(1)
The first side,
A second surface opposite the first surface;
A metal layer having fine cracks,
A decoration portion having a gap between the fine cracks or a light shielding portion formed on at least one of the metal layer and the second surface;
A member having a decorated region to which the decorative portion is bonded such that the first surface is on the front surface side.
(2) The structure according to claim 1, wherein
The light shielding part is a structure including a gap light shielding part formed in a gap of the fine crack.
(3) The structure according to (1) or (2),
The light shielding part includes a light shielding layer formed between the metal layer and the second surface.
(4) The structure according to any one of (1) to (3),
The light-shielding portion is a gap light-shielding portion formed in a gap of the minute crack, and a light-shielding layer located between the metal layer and the second surface and integrally formed with the gap light-shielding portion. A structure that contains.
(5) The structure according to (1),
The said decoration part is a structure containing the decoration function part which has a decoration function comprised in the clearance gap of the said minute crack, or at least one between the said metal layer and the said 2nd surface.
(6) The structure according to (5),
The decorating function section is a structure having a decorating function utilizing at least one of transmission and reflection of light.
(7) The structure according to (5) or (6),
The decorating functional unit is a structure including a gap decorating functional unit configured in a gap of the fine crack.
(8) The structure according to any one of (5) to (7),
The said decoration functional part is a structure containing the decoration functional layer comprised between the said metal layer and the said 2nd surface.
(9) The structure according to any one of (5) to (8),
The decorating functional section is located between the gap decorating functional section configured in the gap of the fine crack and the metal layer and the second surface, and is integrally formed with the gap decorating functional section. A structure including a decorative functional layer configured.
(10) The structure according to any one of (1) to (9),
The structure in which the metal layer is one of aluminum, titanium, chromium, and an alloy containing at least one of them.
(11) The structure according to any one of (1) to (10),
The metal layer is a structure having a thickness of 30 nm or more and 300 nm or less.
(12) The structure according to any one of (1) to (11),
The fine cracks are structures included in a pitch range of 1 μm to 500 μm.
(13) The structure according to any one of (1) to (12),
A structure that is configured as at least part of a housing part, vehicle, or building.
(14) The structure according to any one of (1) to (13),
The said decoration part is a structure body which has a fixed layer which fixes the said fine crack.
(15)
A base film,
Formed on the base film,
The first side,
A second surface opposite the first surface;
A metal layer having fine cracks,
A decorative portion having a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and the second surface.
(16)
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a decorative film including a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A transfer film is formed by adhering a carrier film to the decorative film,
A method for producing a structure, wherein a molded part is formed so that the decorative film is transferred from the transfer film by an in-mold forming method, a hot stamping method, or a vacuum forming method.
(17)
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a transfer film including a gap between the fine cracks, or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A method for manufacturing a structure, wherein a molded part is formed by an in-mold molding method, a hot stamping method, or a vacuum molding method so that the metal layer and the light-shielding portion separated from the base film are transferred.
(18)
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a decorative film including a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A method of manufacturing a structure, wherein a molded part is integrally formed with the decorative film by an insert molding method.
(19) The manufacturing method according to any one of (16) to (18),
The step of forming the fine cracks is a method of manufacturing a structure in which the base film is biaxially stretched at a stretching ratio of 5% or less in each axial direction.
(20)
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A method for producing a decorative film, wherein a light-shielding portion is formed in at least one of the gap between the fine cracks or the surface of the metal layer opposite to the design surface.
(21) The structure according to any one of (1) to (13),
The structure in which the fine cracks are irregularly formed.
(22) The structure according to any one of (1) to (13) and (21),
The above-mentioned decoration part is a structure which has a supporting layer which has a tensile breaking strength smaller than the above-mentioned metal layer and supports the above-mentioned metal layer.
(23) The structure according to (22),
The structure in which the support layer portion is a base film.
(24) The structure according to (26),
The structure in which the support layer is a coating layer formed on the base film.
(25) The manufacturing method according to any one of (16) to (19),
The step of forming the metal layer is a method for manufacturing a structure, in which vacuum deposition is performed on the base film conveyed along a peripheral surface of a rotary drum from a winding roll to a winding roll.

DESCRIPTION OF SYMBOLS 10...

Metal decoration part

11, 411... Decorated area 12...

Decorative film

12a, 412a... Design surface 12b...

Adhesive surface

19, 419, 519...

Base film

20, 420, 520...

Metal layer

21, 421...

Sealing Resin

22, 422, 522... Fine crack 30... Light-shielding part 31... Gap light-shielding part 32... Light-shielding layer 40... Decorative function part 41... Gap-decorating function part 42...

Decorative function layer

50, 450... Transfer film 100... Mobile terminal 101... Casing part 200... Vacuum deposition device 250...

Axial stretching device

300, 350... Molding device

Claims

The first side,
A second surface opposite the first surface;
A metal layer having fine cracks,
A decoration part having a gap between the fine cracks or a light shielding part formed on at least one of the metal layer and the second surface;
A member having a decorated region to which the decorative portion is bonded such that the first surface is on the front surface side.
The structure according to claim 1, wherein
The light shielding part is a structure including a gap light shielding part formed in a gap of the fine crack.
The structure according to claim 1, wherein
The light shielding part includes a light shielding layer formed between the metal layer and the second surface.
The structure according to claim 1, wherein
The light-shielding portion is a gap light-shielding portion formed in a gap of the minute crack, and a light-shielding layer located between the metal layer and the second surface and integrally formed with the gap light-shielding portion. A structure that contains.
The structure according to claim 1, wherein
The said decoration part is a structure containing the decoration function part which has a decoration function comprised in the clearance gap of the said minute crack, or at least one between the said metal layer and the said 2nd surface.
The structure according to claim 5, wherein
The decorating function section is a structure having a decorating function utilizing at least one of transmission and reflection of light.
The structure according to claim 5, wherein
The decorating functional unit is a structure including a gap decorating functional unit configured in a gap of the fine crack.
The structure according to claim 5, wherein
The said decoration functional part is a structure containing the decoration functional layer comprised between the said metal layer and the said 2nd surface.
The structure according to claim 5, wherein
The decorating functional section is located between the gap decorating functional section configured in the gap of the fine crack and the metal layer and the second surface, and is integrally formed with the gap decorating functional section. A structure including a decorative functional layer configured.
The structure according to claim 1, wherein
The structure in which the metal layer is one of aluminum, titanium, chromium, and an alloy containing at least one of them.
The structure according to claim 1, wherein
The metal layer is a structure having a thickness of 30 nm or more and 300 nm or less.
The structure according to claim 1, wherein
The fine cracks are structures included in a pitch range of 1 μm to 500 μm.
The structure according to claim 1, wherein
A structure that is configured as at least part of a housing part, vehicle, or building.
The structure according to claim 1, wherein
The said decoration part is a structure body which has a fixed layer which fixes the said fine crack.
A base film,
Formed on the base film,
The first side,
A second surface opposite the first surface;
A metal layer having fine cracks,
A decorative portion having a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and the second surface.
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a decorative film including a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A transfer film is formed by adhering a carrier film to the decorative film,
A method for manufacturing a structure, wherein a molded part is formed so that the decorative film is transferred from the transfer film by an in-mold forming method, a hot stamping method, or a vacuum forming method.
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a transfer film including a gap between the fine cracks, or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A method for manufacturing a structure, wherein a molded part is formed by an in-mold molding method, a hot stamping method, or a vacuum molding method so that the metal layer and the light-shielding portion separated from the base film are transferred.
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A metal layer on which the fine cracks are formed,
Forming a decorative film including a gap between the fine cracks or a light-shielding portion formed on at least one of the metal layer and a surface opposite to the design surface,
A method of manufacturing a structure, wherein a molded part is integrally formed with the decorative film by an insert molding method.
The manufacturing method according to claim 16, wherein
The step of forming fine cracks is a method of manufacturing a structure in which the base film is biaxially stretched at a stretching ratio of 5% or less in each axial direction.
Form a metal layer on the base film by vapor deposition,
Forming fine cracks in the metal layer by stretching the base film,
A method for producing a decorative film, wherein a light-shielding portion is formed in at least one of the gap between the fine cracks or the surface of the metal layer opposite to the design surface.