Patent Publication Number: US-2023152421-A1

Title: Decorative molded article and manufacturing method for same

Description:
TECHNICAL FIELD 
     The present invention relates to a decorative molded article and a method for manufacturing the decorative molded article, and particularly relates to a decorative molded article that allows transmitting a radio wave and illuminating a specific portion and a method for manufacturing the same. 
     BACKGROUND ART 
     Conventionally, as described in Patent Document 1 (JP 5132656 B), for example, a decorative member referred to as an emblem is attached to a vehicle. As such a decorative member, there is a decorative molded article manufactured by injection-molding a thermoplastic member. When the emblem attached to a front portion of the vehicle is attached in front of a radar device, a radio wave with a wavelength of from 1 mm to 10 mm, which is referred to as a millimeter wave, is required to pass through the emblem. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Document 1: JP 5132656 B 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     The decorative member of Patent Document 1 is formed of a material through which the millimeter wave transmitted and received by the radar device and visible light for decoration are allowed to pass. 
     However, the decorative member itself does not have a function of guiding light so as to illuminate a specific portion of the decorative member. Therefore, in Patent Document 1, a configuration in which a light emitting device of the decorative member includes a light guide plate that guides light to a specific portion and a case body having a reflecting surface, independently of the light emitting device, is employed. To provide the light guide plate and the reflecting surface, the light emitting device becomes a large scale and the decorative member and the light emitting device are expensive, and thus a space required for the decorative member and the light emitting device increases. To change a color of the transmission light, it is necessary to change a color of a light source or color a transmission portion. It is difficult to adjust a subtle tint by the light guide plate and the reflecting surface. 
     An object of the present invention is to provide a decorative molded article that allows easily adjusting a tint of light that illuminates a specific portion and illuminating the specific portion of the decorative molded article with a simple system. 
     Solution to Problem 
     Some aspects will be described below as means to solve the problems. These aspects can be combined randomly as necessary. 
     A decorative molded article according to one aspect of the present invention is a decorative molded article that transmits a radio wave handled by a wireless device that performs at least one of transmission and reception of a radio wave. The decorative molded article illuminates a specific portion by a light irradiated from a light emitting device. The decorative molded article includes a molded body, a decorative sheet, a first reflective layer, and a first coloring unit. The molded body is formed into a predetermined shape. The molded body contains a translucent polymer that allows transmitting a radio wave and transmitting the light from the light emitting device. The decorative sheet is bonded to a front surface of the molded body simultaneously with molding. The first reflective layer is formed so as to have a first opening portion in a back surface of the molded body. The first reflective layer reflects a light incident from the first opening portion and transmits a radio wave. The first coloring unit transmits a radio wave and colors the light incident from the first opening portion to generate a first colored light. The decorative sheet includes a translucent film and a shielding layer. The translucent film transmits a radio wave and a light. The shielding layer is fixedly secured to the translucent film, transmits a radio wave, and shields the first colored light. The shielding layer has a second opening portion. The second opening portion is arranged in the specific portion of the translucent film to take out the first colored light from the molded body to a front of the front surface. 
     Here, the radio wave refers to an electromagnetic wave generated by inverting a current in a conductor at 10 kHz to 3000 GHz. 
     In the decorative molded article configured in this manner, for example, the light from the light emitting device is incident from the first opening portion in the back surface of the molded body that has been molded, the light advances into the translucent polymer of the molded body, and the light is taken out from the second opening portion in the shielding layer of the decorative sheet bonded to the front surface of the molded body to the front of the front surface of the molded body. The specific portion of the decorative molded article can be illuminated by the light taken out from the second opening portion. In addition, the light reflected by the first reflective layers provided on the back surface of the molded body such that the light advances into the translucent polymer is colored by the first coloring unit and becomes the first colored light. Thus, a light guide path can be formed by the translucent polymer of the molded body, the decorative sheet, and the first reflective layers, for example, this eliminates the need for providing the light guide plate and the reflective layer separately from the decorative molded article, and the system that illuminates the decorative molded article by the light emitting device can be simplified. 
     In the decorative molded article described above, the decorative sheet may include a second reflective layer formed between the molded body and the shielding layer. The second reflective layer may transmit a radio wave and reflect the first colored light reflected by the first reflective layer to the first reflective layer. In the decorative molded article configured in this manner, the first colored light is reflected by the second reflective layer to the first reflective layer, and thus an amount of light of the first colored light taken out from the second opening portion can be increased. 
     In the decorative molded article described above, the first coloring unit is preferably provided on a front surface of the molded body. The first coloring unit is preferably a first coloring layer of the decorative sheet that is fixedly secured to the translucent film, transmits a radio wave, and colors the light incident from the first opening portion to generate the first colored light. The decorative molded article configured in this manner allows the light to be colored by the first coloring layer of the decorative sheet, and therefore the configuration of the decorative molded article can be simplified. 
     The decorative molded article described above may include a second coloring unit. The second coloring unit may generate a second colored light. The first reflective layer may have a third opening portion different from the first opening portion at a position where a light is guided to the second coloring unit. In the decorative sheet, the shielding layer may be arranged such that the second colored light reflected by the first reflective layer is allowed to be taken out from the second opening portion to the front of the front surface. The decorative molded article configured in this manner can selectively illuminate the specific portion with the first colored light and the second colored light and can improve designability. 
     In the decorative molded article described above, a smoke portion that transmits a radio wave and has a transmittance lower than a transmittance of the molded body may be arranged on the second opening portion. The decorative molded article configured in this manner can make a boundary between the second opening portion and the shielding layer be less noticeable, and can improve the appearance. 
     In the decorative molded article described above, the decorative sheet may include a second reflective layer formed between the molded body and the shielding layer. The second reflective layer may transmit a radio wave and reflect the first colored light reflected by the first reflective layer to the first reflective layer. The decorative sheet may be provided such that the second reflective layer blocks the second opening portion and the second reflective layer may function as a smoke portion. In the decorative molded article configured in this manner, the second reflective layer can also function as the smoke portion of the second opening portion, and the structure of the decorative molded article in which the smoke portion is arranged on the second opening portion can be simplified. 
     A decorative molded article according to another aspect of the present invention is a decorative molded article that illuminates a specific portion by a light irradiated from a light emitting device and includes a molded body, a decorative sheet, a first reflective layer, and a first coloring unit. The molded body is formed into a predetermined shape. The molded body contains a translucent polymer that allows transmitting the light from the light emitting device. The decorative sheet is bonded to a front surface of the molded body simultaneously with molding. The first reflective layer is formed so as to have a first opening portion in a back surface of the molded body. The first reflective layer reflects a light incident from the first opening portion. The first coloring unit colors the light incident from the first opening portion to generate a first colored light. The decorative sheet includes a translucent film and a shielding layer. The translucent film transmits a light. The shielding layer is fixedly secured to the translucent film and shields the first colored light. The shielding layer has a second opening portion. The second opening portion is arranged in the specific portion of the translucent film to take out the first colored light from the molded body to a front of the front surface. 
     In the decorative molded article configured in this manner, for example, the light from the light emitting device is incident from the first opening portion in the back surface of the molded body that has been molded, the light advances into the translucent polymer of the molded body, and the light is taken out from the second opening portion in the shielding layer of the decorative sheet bonded to the front surface of the molded body to the front of the front surface of the molded body. The specific portion of the decorative molded article can be illuminated by the light taken out from the second opening portion. In addition, the light reflected by the first reflective layers provided on the back surface of the molded body such that the light advances into the translucent polymer is colored by the first coloring unit and becomes the first colored light. Thus, a light guide path can be formed by the translucent polymer of the molded body, the decorative sheet, and the first reflective layers, for example, this eliminates the need for providing the light guide plate and the reflective layer separately from the decorative molded article, and the system that illuminates the decorative molded article by the light emitting device can be simplified. 
     A method for manufacturing a decorative molded article according to one aspect of the present invention is a method for manufacturing a decorative molded article that transmits a radio wave handled by a wireless device that performs at least one of transmission and a reception wireless device of a radio wave and illuminates a specific portion by a light emitting device. A method for manufacturing a decorative molded article includes: setting a decorative sheet in a mold and performs clamping; injecting a molten material into a cavity of the mold to mold a molded body made of a translucent polymer that allows transmitting a radio wave and transmitting a light from the light emitting device and bonding the decorative sheet on a front surface of the molded body; and forming a first reflective layer having a first opening portion in a back surface of the molded body and transmitting a radio wave. The decorative sheet includes: a translucent film, a first coloring layer, a shielding layer, and a second reflective layer. The translucent film transmits a radio wave and a light. The first coloring layer is fixedly secured to the translucent film, transmits a radio wave, and colors a light incident from the first opening portion to generate a first colored light. The shielding layer is fixedly secured to the translucent film, transmits a radio wave, and shields the first colored light. The second reflective layer is formed between the molded body and the shielding layer, transmits a radio wave, and reflects the first colored light reflected by the first reflective layer to the first reflective layer. The shielding layer has a second opening portion. The second opening portion is arranged in the specific portion of the translucent film to take out the first colored light from the molded body to a front of the front surface. In the method for manufacturing the decorative molded article described above, for example, the configuration in which the light from the light emitting device is incident from the first opening portion in the back surface of the molded body, the light advances into the translucent polymer of the molded body, and the light is taken out from the second opening portion in the shielding layer to the front of the front surface of the molded body can be manufactured by decoration simultaneously with molding using the decorative sheet bonded to the front surface of the molded body. Furthermore, the decorative molded article in which the light reflected by the first reflective layer and the second reflective layer provided on the back surface and the front surface of the molded body such that the light advances into the translucent polymer is colored by the first coloring layer and becomes the first colored light can be easily manufactured using the decorative sheet. 
     In the method for manufacturing the decorative molded article described above, the first reflective layer may have a third opening portion different from the first opening portion. The decorative sheet may include a second coloring layer. The second coloring layer may color a light incident from the third opening portion to generate a second colored light. The second reflective layer may be arranged such that the second colored light is reflected to the first reflective layer. The shielding layer may be configured to take out the second colored light to a front of the front surface. In the method for manufacturing the decorative molded article configured in this manner, the decorative molded article with improved designability that allows selectively illuminating the specific portion with the first colored light and the second colored light can be easily manufactured using the decorative sheet. 
     Advantageous Effects of Invention 
     The decorative molded article according to the present invention allows easily adjusting a tint of the light that illuminates the specific portion of the decorative molded article and illuminating the specific portion of the decorative molded article with a simple system. In addition, according to the method for manufacturing the decorative molded article according to the present invention, the decorative molded article according to the present invention can be easily manufactured. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic plan view of a vehicle in which a decorative molded article according to an embodiment is used. 
         FIG.  2    is a schematic side view of a vehicle in which the decorative molded article according to an embodiment is used. 
         FIG.  3    is a cross-sectional view for describing an arrangement example of the decorative molded article, a radar device, and a light emitting device. 
         FIG.  4    is a schematic view illustrating an overview of the radar device and the light emitting device arranged on the back side of the decorative molded article. 
         FIG.  5    is a schematic view illustrating an example of the decorative molded article according to an embodiment. 
         FIG.  6    is a schematic cross-sectional view illustrating a configuration of the decorative molded article according to an embodiment. 
         FIG.  7    is a schematic cross-sectional view for describing clamping of a manufacturing process of the decorative molded article. 
         FIG.  8    is a schematic cross-sectional view for describing injection of a molten material of the manufacturing process of the decorative molded article. 
         FIG.  9    is a schematic cross-sectional view for describing formation of a first reflective layer on a molded body. 
         FIG.  10    is a schematic cross-sectional view illustrating an example of a configuration of a decorative molded article according to Modified Example C. 
         FIG.  11    is a schematic cross-sectional view illustrating an example of a configuration of a decorative molded article according to Modified Example D. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     (1) Overall Configuration 
       FIG.  1    and  FIG.  2    schematically illustrate a vehicle  1 .  FIG.  1    illustrates the vehicle  1  as viewed from above, and  FIG.  2    illustrates the vehicle  1  as viewed from a side surface. A radar device  2  is attached to a front portion of the vehicle  1 . The radar device  2  on the front portion of the vehicle  1  irradiates the front of the vehicle  1  with a beam  3  in a millimeter wave. The millimeter wave transmitted from the radar device  2  contacts and is reflected by a detection target in a case where there is the detection target, such as an obstacle, in front of the vehicle  1 . The radar device  2  receives the millimeter wave contacting and reflected by the detection target. By transmitting and receiving the millimeter wave, the radar device  2  detects the detection target. To accurately detect the detection target, the transmission/reception of the millimeter wave by the radar device  2  is important. 
     As illustrated in  FIG.  3   , the decorative molded article  10  is attached to the front portion of the vehicle  1  in front of the radar device  2 . The decorative molded article  10  is, for example, an emblem of the vehicle  1 . The radar device  2  illustrated in  FIG.  3    transmits and receives the millimeter wave passing through the decorative molded article  10 . In other words, the decorative molded article  10  transmits both of the transmission wave and the reception wave of the radar device  2 . Here, the case where the decorative molded article  10  transmits both of the transmission wave and the reception wave is described, but the decorative molded article may transmit only one of the transmission wave or the reception wave of the millimeter wave. The decorative molded article  10  thus, for example, covers at least a portion of the radar device  2  that detects the detection target by transmission and reception of the millimeter wave and decorates the vehicle  1 . The millimeter wave described in this embodiment is an example of the radio wave passing through the decorative molded article  10 . The radar device  2  is an example of a wireless device that handles radio waves passing through the decorative molded article  10 . 
     In addition, light is incident on the decorative molded article  10  from a light emitting device  5 .  FIG.  4    illustrates a positional relationship between the radar device  2 , the light emitting device  5 , and the decorative molded article  10  as viewed from the front of the vehicle  1 . As illustrated in  FIG.  4   , the light emitting device  5  includes, for example, four LEDs  5   a ,  5   b ,  5   c , and  5   d . The LED is an abbreviation for Light Emitting Diode. The LEDs  5   a ,  5   b ,  5   c , and  5   d  are arranged on the upper edge portion, the lower edge portion, the right edge portion, and the left edge portion on the back side of the decorative molded article  10 . The outermost elliptical shape corresponds to the outer periphery of the decorative molded article  10 .  FIG.  5    illustrates an example of the shape of the decorative molded article  10  as viewed from the front of the vehicle  1 . The decorative molded article  10  is drawn in an elliptical frame  11  in which the characters “ni” are illustrated. The cross-section of the decorative molded article  10  illustrated in  FIG.  3    corresponds to a cross-section taken along the line I-I in  FIG.  5   . In the decorative molded article  10 , the elliptical frame  11  and a character portion  12  “ni” are embossed in the projection shape. The decorative molded article  10  shapes the projected “ni” character shape by the predetermined shape that the molded body  20  has (see  FIG.  6   ). 
     Since the vehicle  1  is also used at night, the decorative molded article  10  has a configuration in which a specific portion  15  is illuminated by the light emitting device  5 . The specific portions  15  are locations indicated by hatchings of dots in  FIG.  5   . 
     (2) Detailed Configuration 
     As illustrated in  FIG.  6   , the decorative molded article  10  includes the molded body  20 , a decorative sheet  30 , a first reflective layer  40 , and a first coloring unit  50 . In  FIG.  6   , an arrow Ar 1  indicates the transmission wave of the millimeter wave, an arrow Ar 2  indicates the reception wave of the millimeter wave, and the arrow Ar 3  indicates the light irradiated from the light emitting device  5 . An arrow Ar 4  indicates light reflected by a second reflective layer  33 , and an arrow Ar 5  indicates light reflected by the first reflective layer  40 . 
     The molded body  20  is mainly a member that determines the outer shape of the decorative molded article  10 . Therefore, the molded body  20  is molded into the predetermined shape so as to provide the shape required for the decorative molded article  10 . The molded body  20  is required to function to transmit the millimeter wave and function to transmit a light. The molded body  20  is a member manufactured by injection molding and is manufactured using a thermoplastic material made of a translucent polymer. 
     The decorative sheet  30  is bonded to a front surface  21  of the molded body  20  simultaneously with molding. The decorative sheet  30  is formed of a material that allows transmitting the millimeter wave. 
     The first reflective layer  40  is formed on a back surface  22  of the molded body  20 . The first reflective layer  40  reflects light and transmits the millimeter wave. This first reflective layer  40  has a first opening portion  41 . The first opening portion  41  is a portion where the first reflective layer  40  is not formed or when the first reflective layer  40  transmits a light due to the incident direction of the light, a portion where the light passes through the first reflective layer  40  and is guided to the molded body  20  can be regarded as the first opening portion. The case where the portion being able to be regarded as the first opening portion is a case where, for example, the first reflective layer  40  is formed by a film that reflects obliquely incident light and transmits vertically incident light. 
     The first coloring unit  50  transmits the millimeter wave and colors the light incident from the first opening portion  41  to generate the first colored light. The first colored light generated by the first coloring unit  50  is reflected by the first reflective layer  40  and advances into the molded body  20 . The first colored light that has advanced into the molded body  20  goes through a second opening portion  32   a  and a fourth opening portion  33   a  and exits a shielding layer  32  to illuminate the specific portion  15 . 
     The decorative sheet  30  includes a translucent film  31  that transmits a millimeter wave and a light and the shielding layer  32  that is fixedly secured to the translucent film  31 , transmits the millimeter wave, and shields the first colored light. The shielding layer  32  has the second opening portion  32   a  arranged in the specific portion  15  of the translucent film  31 . The second opening portion  32   a  is an opening portion for taking out the first colored light from the molded body  20  to the front of the front surface  21  of the molded body  20 . For example, the second opening portions  32   a  are arranged at the positions of the specific portion  15  around the “ni” characters and the circular specific portion  15  illustrated in  FIG.  5   . 
     (2-1) Molded Body  20   
     The molded body  20  is molded by injection-molding a thermoplastic material made of a translucent polymer. The thermoplastic material constituting the molded body  20  includes, for example, a thermoplastic resin and a thermoplastic elastomer. Examples of the thermoplastic resin used for the molded body  20  include polycarbonate resin, acrylic resin, and ABS resin. When the specific portion  15  is arranged at the thermoplastic material to be illuminated, the thermoplastic material is required to transmit the millimeter wave and have translucency. Since the millimeter wave passes through the polycarbonate resin, the acrylic resin, and the ABS resin, the radar device  2  can transmit and receive the millimeter wave through the decorative molded article  10  including the molded body  20  made of these thermoplastic resins. Here, the case where the molded body  20  is made of only the translucent polymer is described. However, the molded body  20  may contain a material other than the thermoplastic material. For example, a ceramic or a glass that can transmit the millimeter wave can be insert-molded together with a translucent thermoplastic resin. 
     As illustrated in  FIG.  6   , a permeable polymer of the molded body  20  forms a light guide path that is the passage of light. The thickness of the molded body  20  of the portion to be the light guide path is preferably 1 mm or more, for example. 
     (2-2) Decorative Sheet  30   
     The decorative sheet  30  includes the second reflective layer  33 . The second reflective layer  33  is formed between the molded body  20  and the shielding layer  32  and reflects the first colored light passing through the millimeter wave and reflected by the first reflective layer  40  to the first reflective layer  40 . The fourth opening portion  33   a  is formed in the second reflective layer  33 . The fourth opening portion  33   a  is arranged at a position overlapping with the second opening portion  32   a . The first colored light reflected by the first reflective layer  40  is radiated to the front of the molded body  20  through the second opening portion  32   a  and the fourth opening portion  33   a.    
     The thickness of the translucent film  31  is generally selected from a range of, for example, from 10 μm to 500 μm. The thickness of the translucent film  31  is preferably from 15 μm to 100 μm to facilitate following the three-dimensional shape of the molded body  20 . 
     For example, resin or elastomer is used for the translucent film  31 . The translucent film  31  made of resin is selected from, for example, a resin film made of a polyester resin, a polyethylene terephthalate (PET) resin, an acrylic resin, a polycarbonate resin, a polybutylene terephthalate (PBT) resin, a triacetyl cellulose resin, a styrene resin, or an ABS resin, a multilayer film made of an acrylic resin and an ABS resin, or a multilayer film made of an acrylic resin and a polycarbonate resin. As the elastomer used for the translucent film  31 , for example, a thermoplastic elastomer (TPE) can be used. The thermoplastic elastomer includes, for example, amide-based TPE (TPA), ester-based TPE (TPC), olefin-based TPE (TPO), styrene-based TPE (TPS), and urethane-based TPE (TPU). 
     The shielding layer  32  is a layer for shielding light. The shielding layer  32  may be configured to cover the entire circumference of the decorative molded article  10 . For example, in a case where the side surface of the decorative molded article  10  is covered with the shielding layer  32 , the decorative sheet  30  is molded by pre-forming such that the side surface of the decorative molded article  10  is covered with the decorative sheet  30 . The shielding layer  32  is formed by, for example, performing gravure printing or screen printing on the translucent film  31 . The materials forming the shielding layer  32  include, for example, resin, such as an acrylic resin, a vinyl chloride vinyl acetate copolymer resin, a thermoplastic urethane resin, or a polyester resin, and a pigment or dye that is added to the resin. The pigment and the dye that do not attenuate the millimeter wave are selected. 
     The second reflective layer  33  is made of, for example, white ink, indium vapor deposition, tin vapor deposition, retroreflective ink, or metal ink having millimeter wave permeability. With the use of white ink, retroreflective ink, or metal ink having the millimeter wave permeability, the second reflective layer  33  is formed by, for example, gravure printing or screen printing. The indium vapor deposition and the tin vapor deposition are performed using a vacuum vapor deposition method, for example. 
     Although not illustrated, an adhesive layer may be provided between the second reflective layer  33  and the molded body  20 , and the second reflective layer  33  may function as an adhesive layer. For example, a thermoplastic resin can be used for the adhesive layer. The thermoplastic resin used for the adhesive layer includes a urethane resin, a polyester resin, a polyamide resin, an acrylic resin, and a vinyl chloride vinyl acetate copolymer resin. The adhesive layer exhibits adhesiveness by heat of a molten resin and improves the adhesion force with the molded body  20 . The thickness of the adhesive layer is, for example, from 2 μm to 20 μm in the film thickness after drying. 
     (2-3) First Reflective Layer  40   
     The first reflective layer  40  is constituted of, for example, white ink, indium vapor deposition, tin vapor deposition, retroreflective ink, a metallic film, or another ink having millimeter wave permeability. With the use of white ink, retroreflective ink, or ink having millimeter wave permeability, the first reflective layer  40  is formed by, for example, gravure printing or screen printing. The indium vapor deposition and the tin vapor deposition are performed using a vacuum vapor deposition method, for example. The metallic film includes, for example, PICASUS (registered trademark) manufactured by TORAY INDUSTRIES, INC. In the case of the metallic film, the metallic film is bonded to the molded body  20  by insert molding during molding of the molded body  20 . 
     (2-4) First Coloring Unit  50   
     In the first embodiment, the first coloring unit  50  is a first coloring layer  34  of the decorative sheet  30  provided on the front surface  21  of the molded body  20 . The first coloring layer  34  is fixedly secured to the translucent film  31 , transmits the millimeter wave, and colors the light incident from the first opening portion  41  to generate the first colored light. It is formed on the second reflective layer  33  of the decorative sheet  30  by, for example, gravure printing or screen printing. The materials constituting the first coloring layer  34  include, for example, a resin, such as an acrylic resin, a vinyl chloride vinyl acetate copolymer resin, a thermoplastic urethane resin, or a polyester resin, and a pigment or dye that is added to the resin. The pigment and the dye that do not attenuate the millimeter wave are selected. 
     (3) Method for Manufacturing Decorative Molded Article  10   
     The method for manufacturing the decorative molded article  10  is described using  FIG.  7   ,  FIG.  8   , and  FIG.  9   . First, as illustrated in  FIG.  7   , the above-described decorative sheet  30  is set in a mold  100 , and the mold  100  is clamped. The decorative sheet  30  includes the translucent film  31 , the shielding layer  32 , the second reflective layer  33 , and the first coloring layer  34 . For example, in a case where the side surface of the decorative molded article  10  is covered with the shielding layer  32 , the decorative sheet  30  is molded by pre-forming before setting the decorative sheet  30  in the mold  100 . A first mold  101  and a second mold  102  of the mold  100  form a cavity  103  therein in the clamped state. 
     As illustrated in  FIG.  8   , a molten material  200  is injected into the cavity  103  of the mold  100 . The molten material  200  is cooled and solidified, and the molded body  20  made of a translucent polymer that can transmit the millimeter wave and transmit the light from the light emitting device  5  is formed. At this time, the decorative sheet  30  is bonded to the front surface of the molded body  20  at the same time. 
     As illustrated in  FIG.  9   , the first reflective layer  40  having the first opening portion  41  and transmitting the millimeter wave is formed on the back surface  22  of the molded body  20 . The first reflective layer  40  is formed by applying white ink to the back surface  22  of the molded body  20  excluding the region of the first opening portion  41 , for example, by a printing technique. 
     Note that when the first reflective layer  40  is formed by a metallic film, the metallic film may be set in the mold  100  before clamping, and the first reflective layer  40  may be formed by insert molding. 
     (4) Features 
     (4-1) 
     In the decorative molded article  10  of the embodiment described above, light is incident from the first opening portion  41  in the back surface  22  of the molded body  20  that has been molded, and the light from the light emitting device  5  advances into the translucent polymer of the molded body  20 . The light from the light emitting device  5  is taken out from the second opening portion  32   a  in the shielding layer  32  of the decorative sheet  30  bonded to the front surface  21  of the molded body  20  to the front of the front surface  21  of the molded body  20 . The specific portion  15  of the decorative molded article  10  can be illuminated by the light from the light emitting device  5  taken out from the second opening portion. 
     Furthermore, the light reflected by the first reflective layer  40  and the second reflective layer  33  provided on the back surface  22  and the front surface  21  of the molded body  20  such that the light advances into the translucent polymer are colored by the first coloring unit  50  to be the first colored light. Thus, a light guide path can be formed by the translucent polymer of the molded body  20 , the decorative sheet  30 , and the first reflective layer  40 , for example, this eliminates the need for providing the light guide plate and the reflective layer separately from the decorative molded article, and the system that illuminates the decorative molded article  10  by the light emitting device  5  can be simplified. 
     (4-2) 
     In the decorative molded article  10  of the embodiment described above, the decorative sheet  30  includes the second reflective layer  33  that is formed between the molded body  20  and the shielding layer  32 , transmits the millimeter wave, and reflects the first colored light reflected by the first reflective layer  40  to the first reflective layer  40 . In the decorative molded article  10 , the first colored light is reflected by the second reflective layer  33  to the first reflective layer  40 , and thus an amount of light of the first colored light taken out from the second opening portion  32   a  can be increased. 
     (4-3) 
     In the decorative molded article  10  of the embodiment described above, the first coloring layer  34  of the decorative sheet  30  is provided on the front surface  21  of the molded body  20 , is fixedly secured to the translucent film  31 , transmits the millimeter wave, and colors the light incident from the first opening portion  41  to generate the first colored light. In this manner, the decorative molded article  10  is simplified such that the light can be colored by the first coloring layer  34  of the decorative sheet  30 . 
     (4-4) 
     In the method for manufacturing the decorative molded article  10  of the embodiment described above, the configuration of the decorative molded article  10  can be achieved by decoration simultaneously with molding using the decorative sheet  30  bonded to the front surface  21  of the molded body  20 . 
     (5) Modified Examples 
     (5-1) Modified Example A 
     As illustrated in  FIG.  9   , in the decorative molded article  10  of the embodiment described above, a smoke portion  33   b  may be arranged for the second opening portion  32   a . The smoke portion  33   b  transmits the millimeter wave and has a lower transmittance than that of the molded body  20 . The decorative molded article  10  of Modified Example A can make a boundary between the second opening portion  32   a  and the shielding layer  32  be less noticeable with the smoke portion  33   b  and can improve the appearance. 
     (5-2) Modified Example B 
     In the decorative sheet  30  of the decorative molded article  10  of Modified Example A, the second reflective layer  33  may be provided so as to block the second opening portion  32   a , and the second reflective layer  33  may function as a smoke portion. In the decorative molded article  10  of Modified Example B, the second reflective layer  33  can also function as the smoke portion of the second opening portion  32   a , and the structure of the decorative molded article  10  in which the smoke portion is arranged on the second opening portion  32   a  can be simplified. 
     (5-3) Modified Example C 
     In the embodiment described above, the case where only the first colored light is guided to the same specific portion  15  has been described. However, lights having a plurality of different colors may be guided to the same specific portion  15 . As in the decorative molded article  10  of Modified Example C illustrated in  FIG.  10   , the first colored light and a second colored light may be guided to the same specific portion  15 . 
     Similarly to the decorative molded article  10  of the embodiment described above, the decorative molded article  10  in  FIG.  10    includes the molded body  20 , the decorative sheet  30 , and the first reflective layer  40 . The decorative molded article  10  of Modified Example C includes a second coloring unit  51  that generates the second colored light. The first coloring unit  50  is the first coloring layer  34  configured by a smoke layer arranged between the second reflective layer  33  of the decorative sheet  30  and the molded body  20 . In the first reflective layer  40 , the first opening portion  41  is arranged at a position where a light is guided to the first coloring layer  34 . The second coloring unit  51  is a second coloring layer  35  configured by a smoke layer arranged between the second reflective layer  33  of the decorative sheet  30  and the molded body  20 . In the first reflective layer  40 , a third opening portion  42  is arranged at a position where a light is guided to the second coloring layer  35 . In the decorative sheet  30 , the shielding layer  32  is arranged such that the second colored light reflected by the first reflective layer  40  can be taken out from the second opening portion  32   a  to the front of the front surface  21  of the molded body  20 . 
     Note that in  FIG.  10   , the first opening portion  41  and the third opening portion  42  are provided with a shielding layer  43  in the first reflective layer  40  of a half mirror. 
     Here, a case where the first opening portion  41  and the third opening portion  42  are covered with the first reflective layer  40  of the half mirror is described, but the region of the first reflective layer  40  overlapping with the portions of the first opening portion  41  and the third opening portion  42  may be removed. 
     For example, when light emitting devices  5   m  and  5   n  are alternately turned on, the specific portions  15  of the decorative molded article  10  can be alternately illuminated with the first colored light and the second colored light different from one another. 
     (5-4) Modified Example D 
     In the above-described modified example C, the case where the second reflective layer  33  is constituted by the half mirror has been described. However, the second reflective layer  33  may have another configuration. For example, in the decorative molded article  10  illustrated in  FIG.  11   , the second reflective layer  33  is formed by a smoke layer. 
     (5-5) Modified Example E 
     The case in which the first coloring unit  50  and the second coloring unit  51  of the embodiments and modified examples described above are the first coloring layer  34  and the second coloring layer  35  provided in the decorative sheet  30  has been described. However, the first coloring unit  50  or the second coloring unit  51  are not limited to the first coloring layer  34  or the second coloring layer  35 . For example, they may be provided on the first opening portion  41  of the first reflective layer  40  or between the first reflective layer  40  and the molded body  20 . 
     (5-6) Modified Example F 
     The embodiment described above has been described with an example of the millimeter wave as the radio wave that passes through the decorative molded article  10 . However, the radio wave that passes through the decorative molded article is not limited to the millimeter wave. The decorative molded article according to the present invention may, for example, transmit a radio wave having a lower frequency than the millimeter wave. The decorative molded article may, for example, transmit the radio wave used when a distance between vehicles is measured using the radio wave having a frequency lower than the millimeter wave. Alternatively, the decorative molded article according to the present invention may be, for example, a radio wave in a frequency band of a submillimeter wave. 
     (5-7) Modified Example G 
     In the embodiment described above, the radar device  2  having the transmission/reception function has been described as an example of a wireless device that handles radio waves passing through the decorative molded article of the present invention. However, the wireless device that handles the radio waves passing through the decorative molded article of the present invention is not limited to the radar device having the transmission/reception function. The wireless device may have only the transmission function or only the reception function. The wireless device may be, for example, an onboard unit of an ETC system (automatic toll collection system) and a receiver having a reception antenna of a radio wave beacon. 
     (5-8) Modified Example H 
     In the embodiment described above, the case where the decorative molded article  10  covers a portion of the radar device  2  has been described. However, the decorative molded article  10  of the present invention may be installed so as not to cover a portion of the radar device  2 . For example, the radar device  2  may be covered with another member, and the decorative molded article  10  may simply be arranged at the passage position of the radio wave of the radar device  2  without covering the radar device  2 . 
     (5-9) Modified Example I 
     In the embodiment described above, the case where the decorative molded article  10  is arranged at the passage position of the radio wave handled by a wireless device, such as the radar device  2 , and the decorative molded article  10  has the function of causing the radio wave to pass through has been described. However, the decorative molded article according to the present invention need not have the function of causing the radio wave to pass through. In the decorative molded article, the molded body  20  described above may be replaced by a molded body that does not transmit a radio wave but is molded into a predetermined shape and contains a translucent polymer that allows transmitting the light from the light emitting device  5 . In the decorative molded article, the first reflective layer  40  described above may be replaced by a first reflective layer that does not transmit a radio wave but is formed so as to have the first opening portion  41  in the back surface of the molded body and reflects the light incident from the first opening portion  41 . In the decorative molded article, the first coloring layer  34  may be replaced by a first coloring layer that does not transmit a radio wave, but colors the light incident from the first opening portion  41  to generate the first colored light. In the decorative molded article, the translucent film  31  of the decorative sheet  30  may be replaced by a translucent film that does not transmit a radio wave but transmits a light. Additionally, in the decorative molded article, the shielding layer  32  of the decorative sheet  30  may be replaced by a shielding layer that does not transmit a radio wave, but is fixedly secured to the translucent film and shields the first colored light. 
     Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention. In particular, the plurality of embodiments and modified examples described herein can be combined randomly with one another as necessary. 
     REFERENCE SIGNS LIST 
     
         
           10  Decorative molded article 
           15  Specific portion 
           20  Molded body 
           30  Decorative sheet 
           31  Translucent film 
           32  Shielding layer 
           32   a  Second opening portion 
           33  Second reflective layer 
           33   b  Smoke portion 
           34  First coloring layer 
           35  Second coloring layer 
           40  First reflective layer 
           41  First opening portion 
           42  Third opening portion