JP6665691B2 - Decorative parts for vehicles - Google Patents

Description

  The present invention relates to a decorative component for a vehicle, which decorates a vehicle and has a transparency of a millimeter wave from a millimeter wave radar device.

  2. Description of the Related Art In a vehicle, a millimeter-wave radar device may be installed behind a decorative component for a vehicle such as a front grill or an emblem in order to measure a distance between vehicles or a distance to an obstacle by using a millimeter wave. Conventionally, this millimeter-wave radar device employs a measure to temporarily stop measurement when snow adheres to a decorative component for a vehicle. However, with the widespread use of millimeter wave radar devices, there is a demand for measurement even during snowfall.

  Therefore, it has been considered to add a snow melting function to a vehicle decorative component. For example, in Patent Literature 1, a main part of a vehicle decorative component is configured by a decorative main body, and a heater wire is formed on a front surface of the decorative main body. In this formation, a plurality of linear portions are set in the heater wire, and these linear portions are arranged in parallel at regular intervals. Further, on the front surface of the decoration main body portion, a groove extending parallel to the linear portions is formed between the linear portions adjacent to the heater wires. In this vehicle decorative component, snow attached to the front surface is melted by the heat of the heater wire to become water. This water flows down along the groove and is drained from the vehicle decorative component.

  In Patent Document 2, a main part of a vehicle decorative component is constituted by a decorative main body, and a metal layer is provided on the decorative main body. In this vehicle decorative component, the metal layer generates heat when energized, and the snow attached to the vehicle decorative component is melted.

JP-A-2004-138572 JP 2002-22821 A

  By the way, decorative parts for vehicles are required to have little attenuation when millimeter waves pass therethrough. On the other hand, it has been found that there is a certain relationship between the amount of attenuation of millimeter waves and the thickness of the decorative component for a vehicle, and more specifically, that the amount of attenuation decreases with a plurality of thicknesses that satisfy certain conditions. . However, in the vehicle decorative component described in Patent Literature 1, since the groove is formed on the front surface of the decorative body, the decorative body has an uneven shape. As a result, it is difficult to reduce the attenuation of the millimeter wave.

Further, in the vehicle decorative component described in Patent Document 2, there is a possibility that the millimeter wave transmitted from the millimeter wave radar device is reflected by the metal layer.
As described above, in each of Patent Literature 1 and Patent Literature 2, the attached snow can be melted, but there is room for improvement in appropriately transmitting the millimeter wave.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle decorative component that can improve the transmission performance of millimeter waves while exhibiting a snow melting function. is there.

  A vehicle decorative component that solves the above-mentioned problem is provided in a vehicle with a decorative main body attached to the front of a millimeter wave radar device in a transmission direction of a millimeter wave to decorate the vehicle and to have a millimeter wave transmittance. At least a main portion of a heating sheet in which a linear heater is formed on a resin sheet is provided integrally with the decoration main body portion, and at least the millimeter wave transmitting region of the decoration main body portion and the heating sheet is The thickness in the front-back direction is set uniformly.

  According to the above configuration, the millimeter wave transmitted from the millimeter wave radar device passes through the decoration main body portion of the vehicle decoration component positioned forward in the transmission direction, and includes a linear heater in the heating sheet. Penetrate the parts that are not covered. Millimeter waves reflected on an object such as a vehicle or an obstacle ahead in the transmission direction also transmit through the decoration body and the heating sheet. Therefore, the millimeter wave is more likely to penetrate the vehicle decorative component than the decorative main body in which the metal layer is provided.

  In addition, in at least the millimeter-wave transmission region of the decoration body and the heating sheet, since the thickness of the vehicle decoration component in the front-rear direction is uniform, irregularities are formed on the front surface of the decoration body, and the thickness in the front-rear direction is reduced. It is possible to reduce the amount of attenuation when a millimeter wave is transmitted as compared with a non-uniform one.

Further, even if snow adheres to the vehicle decorative component, the snow is melted by heat transmitted from the linear heater in the heating sheet.
In the vehicle decorative component, the decorative body portion includes a base member formed of a resin material, a transparent member formed of a resin material, and disposed on a front side of the base member in the transmission direction. And a decorating layer formed between the transparent members and having a millimeter wave transmittance, and at least a main portion of the heating sheet is one of the base material, the transparent member, and the decorating layer. Alternatively, it is preferable to arrange the two adjacent ones so as to overlap each other.

According to the above configuration, in the vehicle decorative component, the decorative layer formed between the base member and the transparent member exhibits a decorative function.
The millimeter wave transmitted from the millimeter wave radar device and the millimeter wave reflected on the object pass through the base material, the decoration layer, and the transparent member in the decoration body. In addition, the millimeter wave is disposed in a state of being superimposed on one or two adjacent ones of the base material, the transparent member, and the decorative layer, and is formed into a linear shape in the heating sheet integrated with the decoration main body. Through the portion where no heater is provided.

  In the vehicle decorative component, the transparent member is divided into a front transparent member and a rear transparent member behind the front transparent member, and at least a main portion of the heating sheet includes the front transparent member and the front transparent member. It is preferable to arrange between the rear transparent members so as to overlap the front transparent member and the rear transparent member.

  According to the above configuration, the heating sheet is located at the location near the front surface of the decoration main body by being arranged at the location. Therefore, the heat of the heater is easily transmitted to the snow attached to the front surface of the vehicle decorative component. Snow is efficiently melted by the heat of the heater.

In the vehicle decorative component, it is preferable that at least a main portion of the heating sheet is disposed so as to overlap the base material from a rear side.
According to the above configuration, the heating sheet is provided outside the decoration main body, and the manufacturing becomes easier as compared with the case where the heating sheet is provided inside.

  In addition, the decoration layer is located forward of the heating sheet, and has a function of hiding the heating sheet. Therefore, when the vehicle decorative component is viewed from the front, the heating sheet is hidden by the decorating layer and is difficult to see.

  In the vehicle decorative component, it is preferable that at least a main portion of the heating sheet is disposed between the decorative layer and the base material so as to overlap with the decorative layer and the base material.

  According to the above configuration, the decorative layer is located forward of the heating sheet, and has a function of hiding the heating sheet. Therefore, when the vehicle decorative component is viewed from the front, the heating sheet is hidden by the decorating layer and is difficult to see.

In the vehicle decorative component, it is preferable that a hard coat layer having higher hardness than the transparent member is formed on a front surface of the transparent member.
According to the above configuration, the transparent member is protected from the front by the hard coat layer, and the transparent member is prevented from being damaged.

In the vehicle decorative component, it is preferable that at least a main portion of the heating sheet is disposed so as to overlap the transparent member from the front side.
By arranging at least the main portion of the heating sheet at the above-described location, the heating sheet is located at the forefront of the decoration main body. Therefore, the heat of the heater is easily transmitted to snow attached to the front surface of the vehicle decorative component. Snow is efficiently melted by the heat of the heater.

In the vehicle decorative component, it is preferable that a hard coat layer having a higher hardness than the heating sheet is formed on at least a front surface of the heating sheet.
According to the above configuration, at least a main portion of the heating sheet is protected from the front by the hard coat layer, and the heating sheet is prevented from being damaged.

In the vehicle decorative component, it is preferable that a water-repellent film is formed on a front surface of the hard coat layer.
The water-repellent film repels water and makes it hard to wet. Therefore, since the water-repellent film is formed on the front surface of the hard coat layer as in the above configuration, the formation of a water film on the front surface of the hard coat layer during snow melting is suppressed by the water-repellent film.

  In the vehicle decorative component, it is preferable that a heat transfer suppressing layer made of a material having a higher load deflection temperature than the base material is formed between at least the main part of the heating sheet and the base material.

  According to the above configuration, transmission of the heat generated by the heater of the heating sheet to the base material is suppressed by the heat transfer suppression layer formed between at least the main part of the heating sheet and the base material. Therefore, the deformation of the base material due to the heat of the heater is suppressed. In addition, as the heat is less likely to be transmitted to the base material, more heat is transmitted to the snow, and the snow melting function is improved.

  In the vehicle decorative component, the heating sheet is provided integrally with the decoration main body only at a main portion thereof, and the heating sheet extends from the main portion to the outside of the decoration main body, and both ends of the heater. It is preferable to provide a connection portion having a connection terminal of the portion.

  According to the above configuration, since the heating sheet is provided integrally with the decoration main body only in the main portion, the connection portion of the heating sheet is located outside the decoration main body. This connection portion has connection terminals at both ends of the heater. Therefore, both connection terminals of the heater are located outside the decoration main body. Therefore, if a connection terminal for power supply is provided in a portion corresponding to the connection terminal in the vehicle, the vehicle decorative component is attached to the vehicle, and the connection terminal for power reception in the heater and the connection for power supply in the vehicle are provided. Terminals can be electrically connected.

  According to the vehicle decorative component, it is possible to improve the transmission performance of the millimeter wave while exhibiting the snow melting function.

FIG. 2 is a front view of the emblem in the first embodiment. FIG. 2 is an explanatory diagram showing a cross-sectional structure of the emblem along line 2-2 in FIG. 1 together with a millimeter wave radar device. FIG. 2 is a front view showing the heating sheet taken out from the emblem in the first embodiment. FIG. 3 is a partial side sectional view showing part A in FIG. 2 in an enlarged manner. FIG. 3 is a partial side sectional view showing a portion B in FIG. 2 in an enlarged manner. 4A and 4B are partial cross-sectional views each showing a part of a manufacturing process of the emblem in the first embodiment. 3A to 3E are partial cross-sectional views each showing a part of a manufacturing process of the emblem in the first embodiment. 4A and 4B are partial cross-sectional views each showing a part of a manufacturing process of the emblem in the first embodiment. The front view which takes out and shows a heating sheet from the emblem in 2nd Embodiment. It is a figure which shows 3rd Embodiment, (a) is a sectional side view of an emblem, (b) is a partial sectional side view which expands and shows a part of FIG.10 (a). It is a figure which shows 4th Embodiment, (a) is a side sectional view of an emblem, (b) is a partial side sectional view which expands and shows a part of FIG.11 (a). It is a figure which shows 5th Embodiment, (a) is a sectional side view of an emblem, (b) is a partial sectional side view which expands and shows a part of FIG.12 (a). It is a figure corresponding to Drawing 5, and a partial side sectional view showing a modification of a connection part of a heating sheet in a 3rd embodiment. FIG. 6 is a diagram corresponding to FIG. 5 and is a partial side sectional view illustrating a sealing structure of an outer peripheral portion of a main portion of the heating sheet.

(1st Embodiment)
Hereinafter, a first embodiment in which a vehicle decorative component is embodied in an emblem will be described with reference to FIGS. In each drawing, the scale of each member is appropriately changed in order to make each member a recognizable size.

  At the front of the engine room of the vehicle is mounted a front grill for introducing outside air such as running wind into the engine room to cool the radiator. In FIG. 5, a part of the front grill 11 is shown by a two-dot chain line.

  As shown in FIG. 2, the rear of the front grill 11 and the front side of the radiator are provided with A.I. C. C. A millimeter wave radar device 15 functioning as a sensor in (adaptive cruise control) is mounted. The millimeter-wave radar device 15 transmits the millimeter wave and receives the millimeter wave reflected on the object, and obtains the distance between the preceding vehicle and the host vehicle (vehicle 10) based on the difference between the transmitted wave and the received wave. Measure distance and relative speed. Millimeter waves are radio waves having a wavelength of 1 to 10 mm and a frequency of 30 to 300 GHz. A. C. C. Controls the throttle and brake of the engine based on the measurement result by the millimeter wave radar device 15 to accelerate / decelerate the own vehicle (vehicle 10) and control the inter-vehicle distance.

  The thickness of the front grill 11 is not constant, as in a general front grill. Further, in the front grill 11, a metal plating layer is formed on the surface of a resin base material as in a general front grill. Therefore, the front grill 11 interferes with the transmitted or reflected millimeter waves. For this reason, in the front grill 11, two points in FIG. 5 are provided at a location on the path of the millimeter wave of the millimeter wave radar device 15, specifically, at a location forward of the millimeter wave transmission direction from the millimeter wave radar device. A window 12 is provided as shown by a chain line. The window portion 12 is a portion of the front grill 11 into which an emblem 20 described later is fitted. A pair of power supply connection terminals 13 are provided at the bottom of the inner wall surface of the window portion 12. These connection terminals 13 have a planar shape extending in the front-rear direction.

  As shown in FIGS. 1 and 2, the emblem 20 includes a decorative main body 21 which is a main part thereof, and a heating sheet 33. The decoration main body 21 includes a base material 22, a transparent member 25, and a decoration layer 32, and has an elliptical plate shape as a whole. The decoration main body 21 is gently curved so as to expand forward.

  The base material 22 is formed of a resin material such as AES (acrylonitrile-ethylene-styrene copolymer) resin, which is a resin material having a small dielectric loss tangent (an index value indicating the degree of electric energy loss in the dielectric), and is formed in a color. . The dielectric loss tangent of the AES resin is 0.007. If the dielectric loss tangent is small, it is difficult to convert the millimeter wave into heat energy, so that the attenuation of the millimeter wave can be suppressed.

  FIG. 4 is an enlarged view of part A of FIG. As shown in FIG. 4, a general portion 23 substantially orthogonal to the front-rear direction and a convex portion 24 protruding forward from the general portion 23 are formed at a front portion of the base member 22. The general part 23 corresponds to the background area 20a of the emblem 20 in FIG. 1, and the convex part 24 corresponds to the character area 20b of the emblem 20. In addition, instead of the AES resin, the base material 22 is a resin having a relative dielectric constant close to that of the transparent member 25, for example, ASA (acrylonitrile-styrene-acrylate copolymer) resin, PC (polycarbonate) resin, PC / ABS (acrylonitrile- (Butadiene-styrene copolymer) resin or the like.

  As shown in FIGS. 2 and 4, the transparent member 25 is formed of a resin material such as a PC resin, which is a resin material having a small dielectric loss tangent, so as to be transparent. The dielectric loss tangent of the PC resin is 0.006, and the relative dielectric constant is almost the same as that of the AES resin. The transparent member 25 is arranged on the front side of the substrate 22. Further, the transparent member 25 is divided into a front transparent member 26 constituting a front part thereof and a rear transparent member 27 constituting a rear part thereof. The rear part of the rear transparent member 27 is formed in a shape corresponding to the shape of the front part of the base material 22. That is, a general portion 28 that is substantially perpendicular to the front-rear direction is formed at a position behind the rear transparent member 27 and in front of the general portion 23 of the base material 22. A concave portion 29 that is recessed forward from the general portion 28 is formed at a position behind the rear transparent member 27 and in front of the convex portion 24 of the base member 22.

The transparent member 25 may be formed of PMMA (polymethyl methacrylate) resin, which is a resin material having a small dielectric loss tangent, similarly to the PC resin.
A hard coat layer 31 is formed on the front surface of the front transparent member 26 by applying a known surface treatment agent to the resin. Examples of the surface treatment agent include organic hard coat agents such as acrylate, oxetane, and silicone, inorganic hard coat agents, and organic-inorganic hybrid hard coat agents. The hard coat layer 31 formed by such a hard coat agent has a scratch preventing action, a stain preventing action, a light resistance and weather resistance improving action by ultraviolet cut, and a water repellent action on the front surface of the front transparent member 26. It brings useful effects such as improvement. In addition, the hard coat layer 31 may be colored as needed within a range in which a millimeter wave can be transmitted.

  The decorative layer 32 is for decorating the front portion of the vehicle 10 including the front grill 11, and is formed between the base material 22 and the rear transparent member 27, and has a millimeter wave transmittance. I have. The decorative layer 32 is configured by, for example, a combination of a colored layer such as black and a metal layer. The colored layer is formed on the general portion 28 of the rear transparent member 27 by a method such as printing. The metal layer is formed by depositing a metal material such as indium on the rear surface of the concave portion 29 of the rear transparent member 27 and the entire rear surface of the colored layer. In addition, in order to suppress corrosion of the metal layer, the decoration layer 32 may be covered with a corrosion prevention layer made of an acrylic or urethane resin material.

  As shown in FIGS. 2 and 3, the heating sheet 33 is also called a sheet heating element, a film heater, or the like, and includes a resin sheet 34 and a linear heater 35 formed on the resin sheet 34. ing. As the resin sheet 34, for example, a sheet formed of PC resin is used. Further, as the linear heater 35, for example, a heater formed by printing a nichrome wire, a transparent conductive film, a carbon heating element, a silver paste, or the like is used. The heater 35 may be further covered with a resin material from the front side.

  The main portion 33a of the heating sheet 33 is disposed between the front transparent member 26 and the rear transparent member 27 so as to overlap the front transparent member 26 and the rear transparent member 27. The main portion 33a is in close contact with the front transparent member 26 and the rear transparent member 27, and is integral therewith. The main portion 33a is gently curved so as to swell forward, similarly to the decorative main body 21 described above. In substantially the entire region of the main portion 33a, the heater 35 is formed in a state of being repeatedly bent in a wave shape. More specifically, the heater 35 has straight portions extending in the up-down direction at a plurality of locations separated from each other in the left-right direction. Assuming that the interval between adjacent linear portions is a pitch P, the pitch P is preferably 3 to 20 mm in order to secure the heat generation required for snow melting and to suppress the attenuation of millimeter waves to 2 dB or less. More preferably, the pitch P is 5 to 15 mm.

  FIG. 5 is an enlarged view of part B of FIG. As shown in FIGS. 3 and 5, the heating sheet 33 includes, in addition to the main portion 33 a, a connection portion 33 b extending from the lower end of the main portion 33 a to the outside of the decoration body 21. Here, the connection portion 33b is bent rearward at a boundary portion with the main portion 33a, and extends rearward from a lower end portion of the main portion 33a. FIG. 3 shows the connection portion 33b in a state where it is not bent. The connection terminals 36 for receiving power at both ends of the heater 35 are formed in the connection portion 33b. These connection terminals 36 have a planar shape extending in the front-rear direction.

  Further, as shown in FIG. 4, a heat transfer suppressing layer 37 made of a material having a higher deflection temperature (thermal deformation temperature) than the base material 22 is formed between the decorative layer 32 and the base material 22. ing. In the first embodiment, the heat transfer suppressing layer 37 is formed of an ultraviolet (UV) curable paint.

  Furthermore, in at least the transmission region Z1 (see FIG. 1) of the decoration main body portion 21 and the heating sheet 33 through which the millimeter wave is transmitted, the thickness T in the front-rear direction of the emblem 20 is substantially equal to a value satisfying the following expression 1. The values are set uniformly. Here, “substantially equal thickness” means a thickness included within an error range of ± 0.2 mm.

T = ｛(λe / 2) / √ (εp)｝ n (Equation 1)
However, the meaning of each symbol in the above formula is as follows.
λe: wavelength of the millimeter wave εp: relative dielectric constant of the transparent member 25 (or the base material 22) n: integer As described above, the thickness T of the emblem 20 is an integer of a value obtained by dividing a half wavelength by the square root of the relative dielectric constant. It is set to double. In the first embodiment, the total thickness T1 of the front transparent member 26 and the hard coat layer 31 in the front-rear direction is set to 1.2 mm. The total thickness T2 (the distance between the front surface of the rear transparent member 27 and the rear surface of the substrate 22) in the front-rear direction of the rear transparent member 27, the decorative layer 32, the heat transfer suppressing layer 37, and the substrate 22 is set to 6.0 mm. Have been. With such a setting, the thickness T of the emblem 20 in the front-rear direction is about 7.2 mm.

Next, the operation and effect of the emblem 20 of the first embodiment configured as described above will be described together with the manufacturing method.
First, a method of manufacturing the emblem 20 will be briefly described with reference to FIGS. 6 to 8, the left side of the drawing corresponds to the front of the emblem 20, and the right side of the drawing corresponds to the rear of the emblem 20.

As shown in FIGS. 6A and 6B, a sheet material 41 in which a heater is formed on a resin sheet is preformed. In the preforming, as shown in FIG. 6A, a sheet material 41 is arranged between a heating sheet forming die 42 and a heater 44. The sheet material 41 is softened by heating the heater 44. The softened sheet material 41 is pressed against the mold 42 as shown in FIG. 6B, and the air between the sheet material 41 and the mold 42 is sucked out to create a state close to a vacuum. . Due to this vacuum state, the sheet material 41 is brought into close contact with the wall surface of the molding recess 43 in the mold 42, and is shaped into a shape corresponding to the heating sheet 33. Thereafter, the unnecessary portion is trimmed (cut off) from the sheet material 41 preformed as described above, so that the main portion 33a that curves gently so as to expand forward and the boundary portion between the main portion 33a are formed. The heating sheet 33 including the connection portion 33b bent rearward is obtained. (See FIG. 7B)
Further, separately from the heating sheet 33, the front transparent member 26 is formed by injection molding. That is, as shown in FIG. 7A, the fixed mold 46 and the movable mold 48 constituting the injection mold 45 are clamped. A cavity 49 (molding space) formed between the fixed mold 46 and the movable mold 48 is filled with molten resin by injection. The front transparent member 26 is formed by curing the molten resin. The mold 45 is opened with the front transparent member 26 remaining in the fixed mold 46.

  As shown in FIG. 7 (b), the heating sheet 33 is arranged as an insert and fixed to the fixed mold 46. With this arrangement, the main portion 33a of the heating sheet 33 is overlaid on the front transparent member 26, and the connection portion 33b is overlaid on the bottom wall of the molding recess 47 of the fixed die 46.

  As shown in FIG. 7C, a movable mold 51 for molding a transparent member different from the movable mold 48 is used to clamp the mold. At this time, not only the main portion 33a of the heating sheet 33 but also the connecting portion 33b are located in the molding recess 47 of the fixed die 46. Therefore, a part of the heating sheet 33, particularly the connection part 33b, is hardly damaged by being pinched by the fixed die 46 and the movable die 51 and receiving an excessive force during the mold clamping.

  The cavity 52 formed between the fixed mold 46 and the movable mold 51 is filled with molten resin by injection. By curing the molten resin, the rear transparent member 27 having the general portion 28 and the concave portion 29 is formed on the rear side of the heating sheet 33 as shown in FIG. In the thus obtained intermediate molded body 53, the main portion 33a of the heating sheet 33 is sandwiched between the front transparent member 26 and the rear transparent member 27, and the connecting portion 33b contacts the lower surface of the rear transparent member 27. The heating sheet 33 is integrated with the front transparent member 26 and the rear transparent member 27 only in the main portion 33a. The connecting portion 33b is located outside the front transparent member 26 and the rear transparent member 27.

  The intermediate molded body 53 is taken out of the mold, and as shown in FIG. 7E, printing and vapor deposition are performed on the general portion 28 and the concave portion 29 of the rear transparent member 27, so that the intermediate molded body 54 is formed. can get. In the intermediate molded body 54, the decorative layer 32 having a constant thickness is laminated on the general portion 28 and the concave portion 29.

  Further, an ultraviolet curable ink is applied on the decorative layer 32, and ultraviolet light is irradiated from a known ultraviolet curing device including a light source lamp such as a high pressure mercury lamp and a metal halide lamp and an irradiator (lamp house). You. By curing the applied ink, an intermediate molded body 55 in which the heat transfer suppressing layer 37 is formed on the decorative layer 32 is obtained as shown in FIG.

  As shown in FIG. 8B, the intermediate molded body 55 is set in a cavity 59 between a fixed mold 57 and a movable mold 58 constituting a mold 56 for injection molding. In the cavity 59, the space behind the heat transfer suppressing layer 37 is filled with a molten resin by injection. By curing the molten resin, the base material 22 having the general portion 23 and the convex portion 24 is formed behind the heat transfer suppressing layer 37 (see FIG. 4).

  The intermediate molded body 55 in which the substrate 22 is molded as described above is taken out of the mold 56. Then, by applying a surface treatment agent to the front surface of the front transparent member 26 in the intermediate molded body 55, the hard coat layer 31 is formed, and the intended emblem 20 is obtained (see FIG. 4). In this emblem 20, as shown in FIG. 2, the main portion 33a of the heating sheet 33 is located inside the decoration main body portion 21, but the connection portion 33b is located below the rear transparent member 27 outside the decoration main body portion 21. To position. The connection portion 33b has connection terminals 36 at both ends of the heater 35.

  This emblem 20 is fitted into the window 12 of the front grill 11 from the front. At the time of this fitting, as shown in FIG. 5, the connection terminal 36 for power reception below the heating sheet 33 in the emblem 20 contacts the connection terminal 13 for power supply at the bottom of the inner wall surface of the window 12, and the electrical connection is made. Connected to.

  In the emblem 20, the decorative layer 32 formed between the base member 22 and the transparent member 25 has a function of decorating the front part of the vehicle. When the emblem 20 is viewed from the front, light is reflected by the decorative layer 32 formed in an uneven shape. Therefore, through the front transparent member 26, the heating sheet 33, and the rear transparent member 27, the characters having metallic luster can be seen three-dimensionally behind them.

  As shown in FIGS. 1 and 2, when a millimeter wave is transmitted forward from the millimeter wave radar device 15 in order to measure the inter-vehicle distance or the relative speed between the vehicle ahead and the vehicle (vehicle 10), the millimeter is transmitted. The wave transmits through the base material 22, the heat transfer suppressing layer 37, the decorative layer 32, the rear transparent member 27, the front transparent member 26, and the hard coat layer 31 in the emblem 20. In the decorative layer 32, the millimeter waves pass through gaps between the deposited metal particles. Further, the millimeter wave transmits through a portion of the main portion 33a of the heating sheet 33 disposed between the rear transparent member 27 and the front transparent member 26, where the heater 35 is not provided. Millimeter waves reflected on an object such as a vehicle or an obstacle ahead in the transmission direction also transmit through the decoration body 21 and the heating sheet 33 in the same manner. Therefore, the millimeter wave is more easily transmitted through the emblem 20 than the one in which a metal layer is provided on the decoration main body (Patent Document 2).

  Further, in at least the transmissive region Z1 (see FIG. 1) of the decoration body 21 and the heating sheet 33, the thickness T of the emblem 20 in the front-rear direction is a value that satisfies the above formula 1, and is uniform. The amount of attenuation when the millimeter wave is transmitted is smaller than that in which the unevenness is formed on the front surface and the thickness in the front-rear direction is not uniform (Patent Document 1).

  Further, when snow adheres to the front surface of the emblem 20, from the vehicle side through the power supply connection terminal 13 and the power reception connection terminal 36 which are electrically connected to each other in the window 12 of the front grill 11. Power is supplied to the heater 35 in the emblem 20. This power supply causes the heater 35 to generate heat. Part of the heat generated by the heater 35 is transmitted to the front surface of the emblem 20 through the front transparent member 26 and the hard coat layer 31, and the snow attached to the front surface is melted.

  Here, the heating sheet 33 is disposed on the transparent member 25 (between the front transparent member 26 and the rear transparent member 27) constituting the front part of the decoration main body 21, so that the heating sheet 33 is provided on the front surface of the decoration main body 21. It is located near. Therefore, the heat of the heater 35 is easily transmitted to snow attached to the front surface of the emblem 20. The snow is efficiently melted by the heat of the heater 35.

  Incidentally, the weight deflection temperature of the AES resin constituting the base material 22 is 78 ° C., which is not so high. However, transmission of the heat generated by the heater 35 to the base member 22 is suppressed by the heat transfer suppressing layer 37 formed between the main portion 33a of the heating sheet 33 and the base member 22. Therefore, deformation of the base material 22 due to heat from the heater 35 is suppressed. If the base material 22 is deformed by heat, the thickness of the decoration body 21 in the front-rear direction may not be uniform, and the attenuation of the millimeter wave may increase. However, in the first embodiment, the attenuation of the millimeter wave is reduced. It is kept low. Further, as the heat is less likely to be transmitted to the base material 22, more heat is transmitted to the snow, and the snow melting function is improved.

  Further, the front transparent member 26 is protected from the front by the hard coat layer 31, and it is possible to prevent the front transparent member 26 from being damaged, and from being deteriorated or deteriorated due to sunlight, wind, rain, temperature change, and the like. .

(2nd Embodiment)
Next, a second embodiment of the vehicle decorative component will be described with reference to FIG.
The second embodiment is different from the first embodiment in that the heating sheet 33 is composed of a main part 33a and a connection part 33b, and that a connection terminal 36 for receiving power of the heater 35 is formed in the connection part 33b. And in common. However, the second embodiment differs from the first embodiment in the wiring pattern of the heater 35 at the main portion 33a of the heating sheet 33. The heater 35 is wired in an elliptical shape along the outer peripheral edge of the resin sheet 34 in the main portion 33a.

The configuration other than the above is the same as that of the first embodiment. Therefore, the same elements as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.
Therefore, according to the emblem 20 of the second embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, when the heater 35 generates heat, a part of the heat is transmitted from all directions toward the center of the area (transmission area Z1) of the decoration main body 21 surrounded by the heater 35. Even if snow adheres to the front surface of the emblem 20, the snow can be uniformly melted by the heat from the heater 35 regardless of the location where the snow adheres.

  In addition, since the heater 35 in the main portion 33a of the heating sheet 33 is located at a position close to the outer peripheral edge of the emblem 20, the heater 35 is less noticeable and has an effect of improving appearance. Further, the portion where the heater 35 is provided is a portion of the decoration main body 21 outside the millimeter wave transmission region Z1. Therefore, the heater 35 is unlikely to hinder the transmission of millimeter waves. Therefore, it is possible to improve the transmission performance of the millimeter wave while exhibiting the snow melting function.

(Third embodiment)
Next, a third embodiment of the vehicle decorative component will be described with reference to FIGS.

  In the third embodiment, unlike the first embodiment in which the transparent member 25 is divided into a front transparent member 26 and a rear transparent member 27, the transparent member 25 is formed by a single member. In the third embodiment, the main portion 33a of the heating sheet 33 is disposed on the transparent member 25 so as to be overlapped from the front side. The main portion 33a is in close contact with the front surface of the transparent member 25 and is integrated with the transparent member 25. The hard coat layer 31 is formed on the front surface of the transparent member 25.

Although the connecting portion 33b of the heating sheet 33 is not shown in FIG. 10A, the connecting portion 33b may be bent backward at the boundary with the main portion 33a as in the first embodiment.
Further, on the front surface of the hard coat layer 31, a water-repellent film 61 made of an organic coating film, a silicone film, or the like is formed.

The configuration other than the above is the same as that of the first embodiment. Therefore, the same elements as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.
Therefore, according to the third embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, by arranging the main portion 33a of the heating sheet 33 at the above-described location, the main portion 33a is located at the forefront of the decoration main body 21. Therefore, the heat of the heater 35 is easily transmitted to snow attached to the front surface of the emblem 20. Snow can be more efficiently melted by the heat of the heater 35.

Further, by protecting the main portion 33a of the heating sheet 33 from the front with the hard coat layer 31, the weather resistance and the scratch resistance of the main portion 33a can be improved.
Furthermore, the water-repellent film 61 formed on the forefront of the emblem 20 repels water and makes it hard to wet. Therefore, formation of a water film on the front surface of the hard coat layer 31 during snow melting can be suppressed.

(Fourth embodiment)
Next, a fourth embodiment of the vehicle decorative component will be described with reference to FIGS. 11 (a) and 11 (b).

  The fourth embodiment is common to the third embodiment in that the transparent member 25 is configured by a single member. However, the third embodiment is different from the third embodiment in that at least the main portion 33a of the heating sheet 33 is disposed on the base member 22 in a state of being placed on the base member 22 from the rear side instead of the front surface of the transparent member 25. In the fourth embodiment, the heat transfer suppressing layer 37 is not formed.

The configuration other than the above is the same as that of the third embodiment. Therefore, the same elements as those described in the third embodiment are denoted by the same reference numerals, and redundant description will be omitted.
Therefore, according to the fourth embodiment, basically, the same operation and effect as those of the third embodiment can be obtained except that the effect of the heat transfer suppressing layer 37 cannot be obtained. However, by disposing the main part 33a of the heating sheet 33 at the above-described location, the main part 33a is located at the rearmost part of the decoration main body 21. Therefore, the heat generated by the heater 35 is less likely to be transmitted to the front surface of the emblem 20 than in the third embodiment.

  On the other hand, the decorating layer 32 is located forward of the heating sheet 33 and has a function of hiding the heating sheet 33. Therefore, when the emblem 20 is viewed from the front, the heating sheet 33 is hidden by the decorative layer 32 and becomes difficult to see.

  In addition, since the heating sheet 33 is located outside the decoration main body 21, the manufacturing is easier than when the main part 33 a of the heating sheet 33 is provided inside the decoration main body 21. For example, the heating sheet 33 may be fixed to the rear surface of the decoration main body 21 by bonding. In this case, since the injection molding does not have to be performed using the heating sheet 33 as an insert, the heating sheet 33 is not pinched by the fixed mold and the movable mold when the mold is clamped. Therefore, the power receiving connection terminal 36 of the heater 35 may be extended or bent to the outside of the decoration main body 21 as in the first embodiment or the like, but need not be. Further, the connection terminal 36 can be replaced with a lead wire.

(Fifth embodiment)
Next, a fifth embodiment of the vehicle decorative component will be described with reference to FIGS.

  The fifth embodiment is common to the third embodiment in that the transparent member 25 is constituted by a single member. However, at least the main portion 33 a of the heating sheet 33 is provided between the decorative layer 32 and the base material 22 instead of the front surface of the transparent member 25, and between the decorative layer 32 and the base surface of the base material 22. The third embodiment is different from the third embodiment in that they are arranged in an overlapping state. The heat transfer suppressing layer 37 is formed between the main portion 33a and the base material 22.

The configuration other than the above is the same as that of the third embodiment. Therefore, the same elements as those described in the third embodiment are denoted by the same reference numerals, and redundant description will be omitted.
Therefore, according to the fifth embodiment, basically, the same operations and effects as those of the third embodiment can be obtained. However, by arranging the main portion 33a of the heating sheet 33 at the above-described location, the heating sheet 33 is located behind the third embodiment, though not as much as in the fourth embodiment. Therefore, the heat generated by the heater 35 is less likely to be transmitted to the front of the emblem 20.

Further, it is necessary to shape the heating sheet 33 into an uneven shape corresponding to the uneven shape of the decorative layer 32.
On the other hand, the decorating layer 32 is located forward of the heating sheet 33 and has a function of hiding the heating sheet 33. Therefore, when the emblem 20 is viewed from the front, similarly to the fourth embodiment, the heating sheet 33 is hidden by the decorative layer 32 and becomes difficult to see.

Each of the above embodiments can be implemented as a modified example in which this is changed as follows.
In each of the above embodiments, a heating sheet in which a linear heater made of a transparent conductive film is formed on a transparent resin sheet may be used. The transparent conductive film is formed by, for example, using ITO (indium tin oxide) as a material and sputtering or depositing the material. In this case, the heater becomes difficult to see, so the appearance of the vehicle decorative component improves.

-In each above-mentioned embodiment, the shape of connection part 33b of heating sheet 33 may be changed. FIG. 13 shows an example in which the above change is made in the third embodiment.
In this modification, a protruding portion 30 that protrudes below the base member 22 is formed below the transparent member 25. A step is formed between the lower surface of the protrusion 30 and the lower surface of the substrate 22. The connecting portion 33b of the heating sheet 33 arranged on the front surface of the transparent member 25 is bent at two places of the front corner and the rear corner of the protrusion 30 of the transparent member 25. Due to the bending at these two places, the connecting portion 33b has a horizontal bent portion 33c extending in the front-rear direction along the lower surface of the projecting portion 30, and a vertical bent portion 33d extending in the vertical direction along the rear surface of the projecting portion 30. Are formed. A connection terminal 36 for receiving electric power in the linear heater 35 is formed in at least the vertical bent portion 33d of the horizontal bent portion 33c and the vertical bent portion 33d.

On the other hand, in the window portion 12 of the front grill 11, a power supply connection terminal 13 extending vertically is provided at a position behind the connection terminal 36.
In this modification, when the emblem 20 is fitted into the window 12 of the front grill 11 from the front, the power receiving connection terminal 36 on the lower rear surface of the heating sheet 33 comes into contact with the power supply connection terminal 13 in the window 12. , And become electrically connected.

  Therefore, when snow adheres to the front surface of the emblem 20, power is supplied from the vehicle side to the heater 35 of the emblem 20 through the power supply connection terminal 13 and the power reception connection terminal 36 to heat the heater 35. Can melt the snow.

  In the first embodiment, depending on the combination of the resin material forming each of the front transparent member 26 and the rear transparent member 27, light is emitted with a refractive index that makes the heating sheet 33 located at the boundary between them difficult to see. It can be incident and reflected.

The wiring pattern of the heater 35 in the main portion 33a of the heating sheet 33 may be changed to a wiring pattern different from those of the first and second embodiments.
For example, the heater 35 may be a straight line. Even in the case where the heater 35 having this shape is used, in order to make it difficult to prevent the transmission of the millimeter wave, the heater 35 is disposed in a portion of the decorative main body 21 outside the transmission region Z1 of the millimeter wave. Is desirable.

  For example, when a heater that extends linearly in the left-right direction is used as the heater 35, the heater 35 may be arranged on at least one of the upper portion and the lower portion of the heating sheet 33. When a heater that extends linearly in the vertical direction is used as the heater 35, the heater 35 may be arranged on at least one of the left side and the right side of the heating sheet 33.

-At least the main portion 33a of the heating sheet 33 may be disposed between the decorative layer 32 and the transparent member 25 so as to overlap with the decorative layer 32 and the transparent member 25.
-Also in the first embodiment, the water-repellent film 61 may be formed on the front surface of the hard coat layer 31.

In each of the above embodiments, the water-repellent film 61 of the plurality of members constituting the decoration main body 21 can be omitted as appropriate.
As a means for imparting water repellency, instead of the water repellent film 61, even if a mold is formed on a molding surface of a mold used for molding a decorative component for a vehicle, or a nano-process is performed. Good.

A material having a hard coat function may be used as the water-repellent film 61. In this case, the hard coat layer 31 may be omitted.
-Of the main part 33a of the heating sheet 33, the outer peripheral part shown by the dashed line in FIG. 14 may be sealed by hot melt or potting (filling with resin). In this way, it is possible to restrict the water generated by the snow melting from entering between the outer peripheral portion and the members (the front transparent member 26 and the rear transparent member 27) adjacent thereto, thereby improving the water resistance.

In the above embodiments, the decoration main body 21 may be formed in a plate shape having a shape different from an ellipse.
In the above embodiments, the emblem 20 may be attached to the vehicle body instead of the front grill 11.

  In the above embodiments, the means for attaching the emblem 20 to the window 12 of the front grill 11 is not particularly limited. The emblem 20 may be attached to the window 12 by, for example, a clip, a screw, a pawl engagement, or the like.

In the above embodiments, the heat transfer suppressing layer 37 can be omitted according to the position of the heating sheet 33.
The vehicle decorative component is attached to the front of the vehicle 10 in the direction of transmitting the millimeter wave from the millimeter wave radar device 15 to decorate the vehicle 10 and to have the millimeter wave transparency. Alternatively, the present invention may be applied to a decorative component for a vehicle different from the emblem 20.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 15 ... Millimeter wave radar apparatus, 20 ... Emblem (decoration part for vehicles), 21 ... Decoration main body part, 22 ... Base material, 25 ... Transparent member, 26 ... Front transparent member, 27 ... Rear transparent member, 31 ... Hard coat layer, 32 ... Decorative layer, 33 ... Heating sheet, 33a ... Main part, 33b ... Connection part, 34 ... Resin sheet, 35 ... Heater, 36 ... Connection terminal, 37 ... Heat transfer suppression layer, 61 ... Repellency Water film, T, T1, T2 ... thickness, Z1 ... transmission area.

Claims (11)

In the vehicle, the vehicle is attached to the front in the transmission direction of the millimeter wave from the millimeter wave radar device, decorates the vehicle, and includes a decoration body having millimeter wave transparency,
At least a main portion of a heating sheet in which a linear heater is formed on a resin sheet is provided integrally with the decorative main body portion,
The decoration main body,
A substrate formed of a resin material,
A transparent member formed of a resin material, and disposed on the front side of the base in the transmission direction,
In at least the millimeter-wave transmission region of the decoration body and the heating sheet, the thickness in the front-rear direction is set to be uniform ,
The thickness (mm) in the front-rear direction in the transmission region is defined as an integer multiple of a value obtained by dividing a half wavelength of the millimeter wave by a square root of a relative dielectric constant of the transparent member or the base material as a thickness T. A decorative part for a vehicle having a value within a range of T ± 0.2 mm . The decoration main body,
Is formed between the front Kimoto material and the transparent member, and further comprising a decorative layer having a millimeter wave transparency,
2. The vehicle decoration according to claim 1, wherein at least a main portion of the heating sheet is arranged so as to overlap one or two adjacent ones of the base material, the transparent member, and the decorative layer. 3. parts. The transparent member is divided into a front transparent member and a rear transparent member on the rear side of the front transparent member,
The vehicle decoration according to claim 2, wherein at least a main portion of the heating sheet is disposed between the front transparent member and the rear transparent member so as to overlap the front transparent member and the rear transparent member. parts.   The vehicle decorative component according to claim 2, wherein at least a main portion of the heating sheet is disposed so as to overlap with the base material from a rear side.   The vehicle decorative component according to claim 2, wherein at least a main portion of the heating sheet is disposed between the decorative layer and the base material so as to overlap the decorative layer and the base material.   The vehicle decorative part according to any one of claims 3 to 5, wherein a hard coat layer having a higher hardness than the transparent member is formed on a front surface of the transparent member.   The vehicle decorative component according to claim 2, wherein at least a main portion of the heating sheet is arranged so as to overlap the transparent member from a front side.   The vehicle decorative component according to claim 7, wherein a hard coat layer having a higher hardness than the heating sheet is formed on at least a front surface of the heating sheet.   The vehicle decorative component according to claim 6, wherein a water-repellent film is formed on a front surface of the hard coat layer.   9. The heat transfer suppressing layer made of a material having a higher deflection temperature under load than at least the main part of the heating sheet and the base material. 2. The decorative component for vehicles according to claim 1. The heating sheet is provided integrally with the decoration main body only at its main part,
The vehicle heating device according to any one of claims 1 to 10, wherein the heating sheet includes a connection portion extending from the main portion to the outside of the decoration main body portion and having connection terminals at both ends of the heater. Decoration parts.

Images