JP2018066705A - Vehicle decorative part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle decorative part that features snow-melting capability and minimizes attenuation of a millimeter wave transmitting through a heater section thereof.SOLUTION: An emblem (vehicle decorative part) 30 comprises a main decorative body 31 and a heater section 55. The main decorative body 31 is attached to a vehicle at a position in front of a millimeter wave radar device in a millimeter wave transmission direction to decorate the vehicle, and has a millimeter wave transmissivity. The heater section 55 has a heat generator 57 that generates heat when energized. At least a portion of the heat generator 57 is located in a millimeter wave irradiation area Z1 within the heater section 55. As a millimeter wave attenuation minimization aspect for minimizing attenuation of a millimeter wave transmitting through the heater section 55, an area ratio of the heat generator 57 in the irradiation area Z1 to the irradiation area Z1 is set to keep millimeter wave attenuation at a level no greater than a tolerance when incorporating the heat generator 57 in the heater section 55.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle decorative component that decorates a vehicle and has millimeter wave permeability from a millimeter wave radar device.

  In a vehicle, in order to measure a distance between vehicles and a distance from an obstacle using millimeter waves, a millimeter wave radar device may be installed on the rear side of a vehicle decorative part such as a front grill or an emblem. Conventionally, this millimeter-wave radar device has taken measures to temporarily stop measurement when snow is attached to a vehicle decorative part. However, with the widespread use of millimeter wave radar devices, it is desired to perform measurement even during snowfall.

  Therefore, it is considered to add a snow melting function to the vehicle decorative part. For example, in Patent Document 1, a main part of a decorative part for a vehicle is configured by a decorative body part, and a heater wire is formed on the front surface of the decorative body part as a heater part that generates heat by energization. In this formation, a plurality of linear portions are set on the heater wire, and these linear portions are arranged in parallel at regular intervals. Furthermore, on the front surface of the decorative main body portion, a groove portion extending in parallel with the linear portions is formed between adjacent linear portions of the heater wires. In this vehicular decorative part, snow adhering 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 part.

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

JP 2004-138572 A JP 2002-22821 A

  According to the conventional vehicle decorative parts described in Patent Document 1 and Patent Document 2 described above, although the snow attached to the vehicle decorative part can be melted by heating the heater part, There is a risk of attenuation during transmission.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a vehicle decorative part capable of suppressing attenuation when millimeter waves pass through a heater portion while exhibiting a snow melting function. Is to provide.

  A vehicle decorative part that solves the above problems is attached to the front of a millimeter wave transmission direction from a millimeter wave radar device in a vehicle to decorate the vehicle, and a decorative main body having millimeter wave permeability, A heater part having a heating element that generates heat by energization, and at least a part of the members constituting the heater part is a millimeter wave attenuation suppression mode that suppresses attenuation when the millimeter wave passes through the heater part. It is built in the heater part.

  According to said structure, the millimeter wave transmitted from the millimeter wave radar apparatus permeate | transmits the decoration main-body part and heater part in the vehicle decoration components located in the transmission direction front. Similarly, the millimeter wave reflected by an object such as a vehicle or an obstacle ahead in the transmission direction is transmitted through the decoration main body and the heater. Attenuation when the millimeter wave passes through the heater part is suppressed by the member constituting the heater part that is incorporated in the heater part in the millimeter wave attenuation suppression mode. For this reason, the amount of attenuation when the millimeter wave passes through the vehicle decorative component is smaller than any component of the heater portion that is not incorporated in the heater portion in the millimeter wave attenuation suppression mode.

  Further, when the heating element of the heater unit is energized, the heating element generates heat. Therefore, even if snow adheres to the decorative part for a vehicle, the heating element is energized to generate heat, so that the snow is melted by the heat transmitted from the heating element.

  In the decorative part for a vehicle, at least a part of the heating element is disposed in the millimeter wave irradiation region in the heater portion, and the heating element is disposed in the irradiation region as the millimeter wave attenuation suppression mode. It is preferable that the heating element is incorporated in the heater section in a state where the area ratio of the heating element in the irradiation region is set so that the attenuation amount of the millimeter wave is not more than an allowable value.

  Here, a portion of the heating element disposed in the irradiation area of the millimeter wave in the heater portion tries to prevent the transmission of the millimeter wave. As more heating elements are arranged in the irradiation region, the attenuation of millimeter waves increases. In this regard, according to the above configuration, paying attention to the area ratio of the heating element in the irradiation area in the irradiation area, the heating element sets the area ratio so that the attenuation of the millimeter wave is less than the allowable value. In this state, it is incorporated in the heater part. Therefore, even if the portion of the heating element arranged in the millimeter wave irradiation area of the heater part prevents the millimeter wave from passing through, the amount of attenuation when the millimeter wave passes through the heater part is less than the allowable value. Can be suppressed.

  In the vehicular decorative part, the heating element is configured such that, as the millimeter wave attenuation suppression mode, the area ratio is 10% or less when the allowable value of the attenuation amount of the millimeter wave is 2.5 dB. It is preferable that it is incorporated in the part.

According to the above configuration, since the heating element is incorporated in the heater section so that the area ratio is 10% or less, the attenuation amount of the millimeter wave is suppressed to the allowable value of 2.5 dB or less.
In the vehicular decorative part, the heater unit includes an electrode and a thermistor as a part of a constituent member, and at least one of the electrode and the thermistor serves as the millimeter wave attenuation suppression mode in the millimeter part of the heater unit. It is preferable that the heater unit is incorporated at a location outside the wave irradiation area.

  The electrode and the thermistor in the heater section can be a factor that prevents millimeter wave transmission. In this regard, according to the above-described configuration, at least one of the electrode and the thermistor is incorporated in the heater portion at a location outside the millimeter wave irradiation region in the heater portion. Therefore, compared to the case where both the electrode and the thermistor are arranged in the irradiation region, the transmission of the millimeter wave is less likely to be prevented, and the attenuation when the millimeter wave passes through the heater portion is reduced.

In the vehicle decorative part, it is preferable that at least one of the electrode and the thermistor is incorporated in the heater portion at a position higher than the irradiation region.
When the snow adhering to the front surface of the vehicle decorative part melts, it becomes water and flows down along the front surface. The same applies when rain, muddy water, or the like adheres to the front surface of the vehicle decorative part. In this regard, as described above, at least one of the electrode and the thermistor is disposed at a location higher than the millimeter wave irradiation region, thereby moving away from the water flowing down as described above. Therefore, the electrode and the thermistor are less likely to touch water compared to the case where the electrode and the thermistor are disposed at a position lower than the irradiation region.

Further, when the heating element generates heat by energization, the temperature of the heating element tends to be lower at the lower part of the heating element and higher at the upper side.
On the other hand, the thermistor is a resistor whose resistance value changes according to a change in temperature, and is generally used as a temperature detecting element. By controlling the energization of the heating element based on the detection value of the thermistor, the temperature of the heater part is adjusted, and deterioration of the decoration main body part due to the heat of the heating element is suppressed.

  In this regard, when the thermistor is arranged at a location higher than the millimeter wave irradiation region, the temperature of the location where the temperature of the heating element is high is detected by the thermistor. Therefore, compared with the case where the thermistor is disposed at a position lower than the millimeter wave irradiation region, the energization amount to the heating element is small, and the deterioration of the decoration main body due to the heat of the heating element is effectively suppressed.

  In the above vehicle decorative component, the heating element includes a plurality of linear portions extending in parallel with each other and a folded portion that connects ends of the adjacent linear portions, and the millimeter wave is a flat surface. The linear portion is preferably incorporated in the heater portion in an inclined state with respect to the polarization plane as the millimeter-wave attenuation suppression mode. .

  Here, if the linear part of the heating element is parallel to the polarization plane of the millimeter wave, the millimeter wave transmitted so as to vibrate on the plane of polarization is in surface contact with the linear part. There is. This surface contact prevents the millimeter wave from passing through the heater, and attenuates the millimeter wave.

  On the other hand, when the linear portion of the heating element is inclined with respect to the polarization plane as in the above configuration, the area where the millimeter wave contacts the linear portion is as described above. However, it is less than when parallel. The amount by which the transmission of millimeter waves is prevented by the straight line portion is reduced, and the attenuation amount of millimeter waves is reduced.

In the vehicle decorative part, it is preferable that the linear portion is incorporated in the heater portion in a state orthogonal to the polarization plane as the millimeter wave attenuation suppression mode.
As in the above configuration, when the linear part of the heating element is orthogonal to the plane of polarization, the area where the millimeter wave contacts the linear part is the case where the linear part is inclined with respect to the plane of polarization. The least. The amount by which the millimeter wave is prevented from being transmitted by the straight line portion is minimized, and the attenuation amount of the millimeter wave is minimized.

  In the vehicular decorative part, it is preferable that the folded portion is incorporated in the heater portion at a location deviating from the millimeter wave irradiation region in the heater portion as the millimeter wave attenuation suppression mode.

The folded portion connects adjacent straight portions extending in parallel with each other, and has a portion inclined with respect to the straight portion.
Therefore, even if the linear portion of the heating element is inclined with respect to the plane of polarization as described above, the millimeter wave may come into surface contact with the folded portion. In this case, although not as much as when the straight line portion is parallel to the plane of polarization, the millimeter wave is prevented from passing through the heater portion, and the millimeter wave is attenuated.

  In this regard, as described above, the folded portion is disposed at a location outside the millimeter wave irradiation region in the heater portion, so that transmission of millimeter waves is performed as compared with the case where the folded portion is disposed in the irradiation region. Is less disturbed, and the amount of attenuation when millimeter waves pass through the heater portion is reduced.

  In the decorative part for a vehicle, the decoration main body portion is attached to an attachment portion of the vehicle in an upright state, and the attachment portion is a lower attachment positioned below the decoration main body portion. The decorative main body portion has a front end in the transmission direction that is the same as the front end of the lower adherent portion, or is located on the adherend portion in a state of being positioned forward of the front end of the lower adherend portion. It is preferable that it is attached.

  Here, when the front end in the transmission direction of the decoration main body portion is located behind the front end of the lower adherend portion, a part of the lower adherend portion protrudes forward from the ornament main body portion. Therefore, when a part of the snow adhering to the front surface of the vehicular decorative part is melted by the heat from the heater part, there is a possibility that the part where the snow is not melted accumulates on the protruding part of the lower covering part.

  In this regard, as described above, when the front end of the decoration main body portion is the same as the front end of the lower adherend portion or is positioned in front of the front end of the lower adherend portion, the lower adherend portion is more than the ornament main body portion. Does not protrude forward. Therefore, when a part of the snow adhering to the front surface of the vehicle decorative part is melted by the heat of the heater part, the part where the snow is not melted flows down without being piled on the lower adherend part.

  In the decorative part for a vehicle, the decoration main body portion is attached to an attachment portion of the vehicle in an upright state, and the attachment portion is a lower attachment positioned below the decoration main body portion. The lower covering portion has an inclined surface that becomes lower toward the front side in the transmission direction, and the decorative main body portion has a front end in the transmission direction at the inclined surface of the lower covering portion. It is preferable that it is attached to the said adherend part in the state located above.

  Here, when the front end in the transmission direction of the decoration main body portion is located behind the front end of the lower adherend portion, a part of the lower adherend portion protrudes forward from the ornament main body portion. If the upper surface of the lower covering part is horizontal, when a part of the snow adhering to the front surface of the vehicle decorative part is melted by the heat from the heater part, the unmelted part of the snow is the lower covering part. There is a risk of accumulating on the protruding part.

  In this regard, as in the above configuration, the lower adherend portion has an inclined surface that becomes lower toward the front side in the transmission direction, and the front end in the transmission direction of the decoration main body portion is located above the inclined surface. When a part of the snow adhering to the front surface of the vehicle decorative part is melted by the heat from the heater part, the unmelted part of the snow flows down along the inclined surface and can accumulate on the lower adherend part. It is suppressed.

  According to the above vehicle decorative component, it is possible to suppress attenuation when the millimeter wave passes through the heater portion while exhibiting a snow melting function.

The front view which shows the emblem in one Embodiment which embodied the decorative component for vehicles in the emblem. The schematic front view which shows the heater part in the emblem of FIG. 1 with the irradiation area | region and polarization plane of a millimeter wave. The sectional side view which shows the state in which the emblem in one Embodiment was attached to the front grille with a millimeter wave radar apparatus. The perspective view explaining the relationship between the heat generating body and the polarization plane of millimeter wave in one Embodiment. FIG. 4 is a partial side cross-sectional view showing an enlarged portion A of FIG. 3. The sectional side view which shows the modification of an emblem. The fragmentary sectional side view which shows the modification of the attachment structure with respect to the front grill of an emblem.

  Hereinafter, an embodiment in which a vehicle decorative part is embodied in an emblem will be described with reference to FIGS. In addition, in each figure, in order to make each member into a recognizable size, the scale of each member is appropriately changed and shown.

  As shown in FIGS. 3 and 4, a front grill 11 is attached to the front part of the engine room of the vehicle 10 for introducing outside air such as traveling wind into the engine room to cool the radiator.

  Further, at the rear of the front grill 11 and on the front side of the radiator, A. C. C. A millimeter wave radar device 25 that functions as a sensor in (adaptive cruise control) is attached. The millimeter wave radar device 25 transmits the millimeter wave 26 and receives the millimeter wave 26 reflected by the object. The millimeter wave 26 is transmitted from the millimeter wave radar device 25 so as to vibrate on a plane of polarization 27 parallel to the vertical plane. The millimeter wave radar device 25 measures the inter-vehicle distance and relative speed between the preceding vehicle and the host vehicle (vehicle 10) from the difference between the transmitted millimeter wave 26 (transmitted wave) and the received millimeter wave 26 (received wave). The millimeter wave 26 is a radio wave 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 25 to accelerate and decelerate the own vehicle (vehicle 10), thereby controlling the inter-vehicle distance.

  The thickness of the front grill 11 is not constant like a general front guru. Further, in the front grill 11, a metal plating layer may be formed on the surface of the resin base material in the same manner as a general front guru. Accordingly, the front grill 11 interferes with the transmitted or reflected millimeter wave 26. For this reason, in the front grill 11, the window portion 12 is provided at a location that is a path of the millimeter wave 26 of the millimeter wave radar device 25, specifically, at a location that is forward in the transmission direction of the millimeter wave 26 from the millimeter wave radar device 25. Is provided.

  As shown in FIG. 1 and FIG. 3, the emblem 30 is attached to the front of the vehicle 10 in the transmission direction of the millimeter wave from the millimeter wave radar device 25 to decorate the vehicle 10 and provide millimeter wave permeability. And a heater body 55 having a heating element 57 that generates heat when energized.

  The decorative main body 31 includes a transparent member 32, a base material 35, a connecting portion 45, and a decorative layer 50, and has a substantially elliptical plate shape as a whole. Moreover, the decoration main body 31 is gently curved so as to swell forward.

  The transparent member 32 is a member that constitutes a front side portion of the emblem 30. The transparent member 32 is transparently formed of a resin material such as a PC (polycarbonate) resin which is a resin material having a small dielectric loss tangent (an index value representing the degree of electric energy loss in the dielectric). The dielectric loss tangent of PC resin is 0.006. If the dielectric loss tangent is small, it is difficult for the millimeter wave 26 to be converted into thermal energy, so that attenuation of the millimeter wave 26 can be suppressed.

  FIG. 5 is an enlarged view of part A of FIG. As shown in FIG. 5, the rear portion of the transparent member 32 is formed with a general portion 33 that is substantially orthogonal to the front-rear direction and a recess 34 that is recessed forward from the general portion 33. The general portion 33 corresponds to the background region 30 a of the emblem 30 in FIG. 1, and the concave portion 34 corresponds to the pattern region 30 b of the emblem 30. Here, the pattern region 30b is constituted by the character (A) and the surrounding annular portion. The transparent member 32 may be formed of a PMMA (polymethyl methacrylate) resin, which is a resin material having a small dielectric loss tangent, like the PC resin.

  A hard coat layer (not shown) is formed on the front surface of the transparent member 32 by applying a known surface treatment agent for resin. Examples of the surface treatment agent include acrylate-based, oxetane-based, silicone-based organic hard coat agents, inorganic hard coat agents, organic-inorganic hybrid hard coat agents, and the like. The hard coat layer formed of such a hard coat agent has a scratch-preventing action, a dirt-preventing action, a light resistance and weather resistance improving action by UV cut, an improvement in water repellency, etc. with respect to the front surface of the transparent member 32. It has a useful effect. Note that the hard coat layer may be colored within a range in which the millimeter wave 26 can be transmitted, if necessary.

  As shown in FIGS. 3 and 5, the base material 35 is a member constituting the rear portion of the emblem 30 and is a resin such as an AES (acrylonitrile-ethylene-styrene copolymer) resin, which is a resin material having a small dielectric loss tangent. Depending on the material, it is colored. The dielectric loss tangent of AES resin is 0.007, and the relative dielectric constant is almost the same as that of PC resin. Furthermore, the base material 35 is divided into a front base material 36 constituting the front portion and a rear base material 41 constituting the rear portion. The front part of the front substrate 36 is formed in a shape corresponding to the shape of the rear part of the transparent member 32. That is, a general portion 37 that is substantially orthogonal to the front-rear direction is formed at a front portion of the front substrate 36 and at the rear of the general portion 33 of the transparent member 32. A convex portion 38 that protrudes further forward than the general portion 37 is formed at the front portion of the front substrate 36 and at the rear of the concave portion 34 of the transparent member 32.

  Here, in the front base material 36 provided with the general part 37 and the convex part 38 as described above, the thickness of the part having the convex part 38 is larger than the thickness of the part having the general part 37. For this reason, when the front substrate 36 is formed of a resin material, the volume shrinkage when the molten material is cooled is greater in the portion having the convex portion 38 than in the portion having the general portion 37. For this reason, a recess 39 due to sink marks may occur at a location on the rear surface of the front substrate 36 and behind the convex portion 38. In this case, a gap portion G <b> 1 is generated between the recess 39 of the front base material 36 and a main portion 56 described later of the heater portion 55.

  At a plurality of locations on the rear surface of the rear base 41 and outside the millimeter wave irradiation area Z1 (see FIG. 2), attachment portions 42 for attaching the decorative main body 31 to the front grill 11 protrude rearward. It is formed to do.

  The base material 35 (the front base material 36 and the rear base material 41) is replaced with an AES resin, a resin having a dielectric constant close to that of the transparent member 32, such as an ASA (acrylonitrile-styrene-acrylate copolymer) resin, PC It may be formed of resin, PC / ABS (acrylonitrile-butadiene-styrene copolymer) resin, or the like.

  The connecting portion 45 is provided along the outer peripheral portion of the emblem 30 to form a substantially elliptical ring shape, and is located outside the irradiation region Z1 (see FIG. 2). The connecting portion 45 is formed in black by a mixed resin material of PC resin and carbon black, for example. The connecting portion 45 is welded to the transparent member 32 and the front base material 36 to connect the transparent member 32 and the front base material 36.

  The decoration layer 50 is for decorating the front portion of the vehicle 10 including the front grille 11 and is formed in a region between the transparent member 32 and the front base material 36 and surrounded by the connecting portion 45. It has millimeter-wave transparency. The decorative layer 50 is configured by a combination of a colored layer 51 such as black and a metal layer 52, for example. The colored layer 51 is formed on the general portion 33 of the transparent member 32 by a method such as printing. The metal layer 52 is formed by evaporating a metal material such as indium on the wall surface of the recess 34 of the transparent member 32 and the entire rear surface of the colored layer 51.

  As shown in FIG.2 and FIG.5, the heater part 55 is comprised by what is also called a planar heating element, a film heater, etc. FIG. The heater unit 55 includes a linear heating element 57, an electrode 61, a thermistor 62, a resin sheet 63, and a connector 65 as constituent members. The heating element 57, the electrode 61, and the thermistor 62 are covered by being sandwiched between the resin sheets 63 from the front and rear. The heating element 57, the electrode 61, the thermistor 62, and the resin sheet 63 constitute a main part 56 of the heater part 55.

  As the resin sheet 63, for example, a sheet formed of a polyimide resin is used. As the linear heating element 57, for example, a nichrome wire, a SUS etching heater, a carbon heating element, a silver paste, a transparent conductive film, or the like is used.

  As shown in FIGS. 2 and 4, the heating element 57 includes a plurality of linear portions 58 that extend in parallel to each other and an arcuate folded portion 59 that connects the ends of the adjacent linear portions 58. . As a mode for suppressing attenuation when the millimeter wave 26 passes through the heater unit 55 (hereinafter referred to as “millimeter wave attenuation suppression mode”), the straight line portion 58 is a heater in a state orthogonal to the polarization plane 27 of the millimeter wave 26. The unit 55 is incorporated. Since the polarization plane 27 is parallel to the vertical plane, each linear portion 58 is wired so as to extend in the horizontal direction (left-right direction).

  Some of the straight portions 58 among all the straight portions 58 are arranged in the irradiation region Z1 of the millimeter wave 26 in the heater portion 55. The heating element 57 is a state in which the area ratio of all the linear portions 58 in the irradiation region Z1 in the irradiation region Z1 is set to be equal to or less than the allowable value of the attenuation amount of the millimeter wave 26 as a millimeter wave attenuation suppression mode. It is incorporated in the heater part 55. In the present embodiment, the wiring pattern of the heating element 57, for example, the width of the straight portion 58, the adjacent straight line is set so that the allowable value of the attenuation amount of the millimeter wave 26 is 2.5 dB and the area ratio is 10% or less. An interval (pitch) or the like for 58 minutes is set.

  The electrode 61 is connected to both ends of the heat generating element 57. The thermistor 62 is a resistor whose resistance value changes in accordance with a change in temperature, and is used as a temperature detection element. The thermistor 62 is provided in the middle of one of the electrodes 61 and is connected to an electronic control device (not shown) provided at a location away from the emblem 30 in the vehicle 10. The electronic control device adjusts the temperature of the heater unit 55 by controlling the energization of the heating element 57 through the electrode 61 based on the detection value of the thermistor 62.

A connector 65 having a waterproof structure is used, and this is connected to the ends of both electrodes 61. The connector 65 protrudes rearward from the resin sheet 63.
The folded portion 59, the electrode 61, and the thermistor 62 in the heating element 57 are incorporated in the heater portion 55 at a location outside the irradiation region Z <b> 1 of the millimeter wave 26 in the heater portion 55 as a millimeter wave attenuation suppression mode. In particular, the electrode 61 and the thermistor 62 are incorporated in the heater portion 55 at a location higher than the irradiation region Z1.

  Further, as shown in FIGS. 3 and 5, there are uncovered portions that do not cover the heating element 57, the electrode 61, and the thermistor 62 at a plurality of locations of the resin sheet 63. A penetrating portion 64 penetrating in the front-rear direction is provided in at least a part of them. Each penetration part 64 is formed by punching out the resin sheet 63, for example. Some of the through portions 64 of the plurality of through portions 64 are connected to the recess 39 behind the convex portion 38 on the rear surface of the front base material 36.

  Of the heater portion 55, the main portion 56 is disposed between the front base material 36 and the rear base material 41, and the connector 65 is exposed on the rear surface of the rear base material 41. The front base material 36 and the rear base material 41 that sandwich the main portion 56 of the heater portion 55 from both front and rear sides are joined to each other by welding in a state where the main portion 56 is sealed. That is, the rear base material 41 is joined by welding to the rear surface of the front base material 36 around the main portion 56 of the heater portion 55.

  Further, the rear base material 41 has the same number of recess filling portions 43 as the recesses 39 and the same number of coupling portions 44 as the through portions 64. Each recess filling portion 43 is joined to the wall surface of the recess 39 in a state where the recess 39 is embedded. Each coupling portion 44 protrudes forward from a position on the front surface of the rear base 41 and behind the through portion 64, and fills the through portion 64.

  Of the plurality of through portions 64, the coupling portion 44 that fills a portion that is not connected to the depression 39 of the front substrate 36 is directly joined to a portion of the rear surface of the front substrate 36 that is different from the depression 39. In addition, the coupling portion 44 that fills the through-hole 64 that is connected to the recess 39 of the front substrate 36 is connected to the recess filling portion 43, and the front substrate is interposed via the recess filling portion 43. Of the rear surface of 36, it is indirectly joined to the recess 39.

  Furthermore, when the dimension of the emblem 30 in the front-rear direction of at least the irradiation region Z1 in the decoration main body portion 31 and the heater portion 55 is a thickness T, the thickness T is a value substantially equal to a value satisfying the following Expression 1. Is set uniformly. Here, “substantially equal thickness” means a thickness included within an error range of ± 0.2 mm.

T = {(λe / 2) / √ (εp)} n (Expression 1)
The meaning of each symbol in the above formula is as follows.
λe: millimeter wave wavelength εp: relative dielectric constant of transparent member 32 (or base material 35) n: integer As described above, the thickness T of the emblem 30 is an integer obtained by dividing the half wavelength by the square root of the relative dielectric constant. It is set to double.

  As shown in FIG. 3, the front grill 11 is provided with an adherent portion 13 around which the emblem 30 having the above-described configuration is attached. The adherend portion 13 includes an upper adherend portion 14 on the upper side of the window portion 12 and a lower adherend portion 17 on the lower side.

  As described above, the attachment portion 42 is formed on the rear surface of the rear base material 41, but the upper attaching portion 14 is provided with the insertion hole 15 into which the attachment portion 42 is inserted. Similar insertion holes 15 are provided at a plurality of locations around the window portion 12 in the adherend portion 13 in addition to the upper adherend portion 14. Further, the lower adherent portion 17 has a curved portion 18 having an arc cross section at the front end.

  Then, each attachment portion 42 is inserted into the corresponding insertion hole 15 from the front and locked, so that the emblem 30 is attached to the adherend portion 13 in a standing state so as to satisfy the following conditions. It has been. This standing state includes a vertical state and a state inclined with respect to the vertical state. In the present embodiment, a state where the upper portion of the emblem 30 is slightly inclined so that the upper portion is positioned slightly rearward of the lower portion is defined as the standing state.

  The condition is that the front end 30c of the emblem 30 (decorative main body portion 31) is the same as the front end 17a of the lower adherend portion 17 or is located in front of the front end 17a. The front end 30 c of the emblem 30 is a portion that is located at the foremost position on the front surface of the emblem 30. In the present embodiment in which the emblem 30 is slightly inclined so that the upper portion is positioned slightly rearward of the lower portion, the lower end of the front surface of the emblem 30 corresponds to the front end 30c. The front end 17 a of the lower adherent portion 17 is constituted by the front end of the bendable portion 18 in the present embodiment in which the lower adherend portion 17 has the bendable portion 18. In the present embodiment, the front end 30c of the emblem 30 (decorative main body 31) is located at a position away from the front end 17a of the lower adherend portion 17 by a distance D (> 0).

  Further, the connector 66 on the vehicle 10 side is coupled from the rear side to the connector 65 exposed on the rear surface of the rear base material 41, whereby the heater portion 55 is electrically connected to the electronic control device or the like. . The cable 67 connected to the connector 66 is passed through the insertion hole 16 provided in the upper adherend portion 14.

Next, the operation and effect of the emblem 30 of the present embodiment configured as described above will be described.
In the emblem 30, the decorative layer 50 formed between the base material 35 and the transparent member 32 exhibits a function of decorating the front portion of the vehicle 10. When the emblem 30 is viewed from the front, the light is reflected by the decorative layer 50 formed in an uneven shape. Therefore, through the hard coat layer and the transparent member 32, a pattern including characters having metallic luster on the back side thereof can be seen three-dimensionally.

  In addition, the decoration layer 50, the front base material 36, and the connection part 45 are arrange | positioned in the front side of the heater part 55, These exhibit the function which conceals the heater part 55. FIG. Therefore, the heater portion 55 is difficult to see from the front of the emblem 30 and the appearance is not easily impaired.

  When the millimeter wave 26 is transmitted forward from the millimeter wave radar device 25 in order to measure the inter-vehicle distance and relative speed between the preceding vehicle and the host vehicle (vehicle 10), the millimeter wave 26 is transmitted to the rear base in the emblem 30. The material 41, the heater portion 55, the front substrate 36, the decorative layer 50, the transparent member 32, and the hard coat layer are transmitted therethrough. Similarly to the above, the millimeter wave 26 reflected by an object such as a vehicle or an obstacle ahead in the transmission direction is transmitted through the decorative main body 31 and the heater 55.

  The attenuation when the millimeter wave 26 passes through the heater portion 55 is suppressed by the members constituting the heater portion 55 that are incorporated in the heater portion 55 in the millimeter wave attenuation suppression mode as follows.

  (1) As shown in FIG. 2, the portion of the heating element 57 disposed in the irradiation region Z <b> 1 of the millimeter wave 26 in the heater portion 55 tries to prevent the transmission of the millimeter wave 26. As more heating elements 57 are arranged in the irradiation region Z1, the attenuation amount of the millimeter wave 26 increases. In this regard, in the present embodiment, attention is paid to the area ratio of the heating element 57 in the irradiation area Z1 to the irradiation area Z1, and the heating element 57 reduces the area ratio and the attenuation amount of the millimeter wave 26 is less than the allowable value. The heater unit 55 is incorporated in such a state. That is, the wiring pattern (width, pitch, etc.) of the heating element 57 is set so that the allowable value is 2.5 dB and the area ratio is 10% or less.

  Therefore, even if a portion of the heating element 57 disposed in the irradiation region Z1 prevents the millimeter wave 26 from being transmitted, the amount of attenuation when the millimeter wave 26 passes through the heater portion 55 is an allowable value. It can be suppressed to a certain 2.5 dB or less.

  (2) The electrode 61 and the thermistor 62 in the heater portion 55 can be a factor that prevents the millimeter wave 26 from being transmitted. In this regard, in the present embodiment, as shown in FIG. 2, the electrode 61 and the thermistor 62 are incorporated in the heater portion 55 at a location outside the irradiation region Z1 of the millimeter wave 26 in the heater portion 55. Therefore, compared to the case where both the electrode 61 and the thermistor 62 are disposed in the irradiation region Z1, the transmission of the millimeter wave 26 is less likely to be prevented, and the attenuation when the millimeter wave 26 passes through the heater portion 55 is reduced.

  (3) If the linear portion 58 of the heating element 57 is parallel to the polarization plane 27 of the millimeter wave 26, the millimeter wave 26 transmitted to vibrate on the plane of polarization 27 is a straight line. There may be surface contact with the portion 58. This surface contact prevents the millimeter wave 26 from passing through the heater portion 55 and attenuates the millimeter wave 26.

  On the other hand, as shown in FIGS. 2 and 4, when the straight portion 58 is inclined with respect to the polarization plane 27, the area where the millimeter wave 26 contacts the straight portion 58 is equal to the straight portion as described above. 58 is smaller than when parallel to the polarization plane 27. The amount by which the transmission of the millimeter wave 26 is prevented by the straight line portion 58 is reduced, and the attenuation amount of the millimeter wave 26 is reduced.

  In particular, in the present embodiment, the linear portion 58 is incorporated in the heater portion 55 in a state orthogonal to the polarization plane 27. Therefore, the area where the millimeter wave 26 contacts with the straight portion 58 is the smallest in the case where the straight portion 58 is inclined with respect to the polarization plane 27. The amount of the millimeter wave 26 whose transmission is blocked by the straight line portion 58 is the smallest, and the attenuation amount of the millimeter wave 26 is the smallest.

(4) The folded portion 59 of the heating element 57 connects the adjacent straight portions 58 in a state of extending in parallel with each other, and has a portion inclined with respect to the straight portion 58.
Therefore, even if the straight portion 58 is inclined (orthogonal) with respect to the polarization plane 27 as described above, the millimeter wave 26 may come into surface contact with the folded portion 59. In this case, although not as much as when the straight portion 58 is parallel to the polarization plane 27, transmission of the millimeter wave 26 through the heater portion 55 is hindered and attenuated.

  In this regard, as shown in FIG. 2, when the folded portion 59 is disposed in the irradiation region Z <b> 1 by being disposed at a position outside the irradiation region Z <b> 1 of the millimeter wave 26 in the heater unit 55 as illustrated in FIG. 2. Compared to the above, the transmission of the millimeter wave 26 is less likely to be prevented, and the amount of attenuation when the millimeter wave 26 passes through the heater portion 55 is reduced.

  As a result, the amount of attenuation when the millimeter wave 26 passes through the heater portion 55 is reduced as compared with those in which any component of the heater portion 55 is not incorporated in the heater portion 55 in the various millimeter wave attenuation suppression modes.

  Here, the main portion 56 including the heating element 57 of the heater portion 55 is sandwiched from the front and rear by the front base material 36 and the rear base material 41 constituting the base material 35. In addition, the gap G1 in contact with the main portion 56 in the base 35 is filled with a part of the rear base 41, that is, the same resin material as the base 35, and the base 35 has a gap inside. There is no state. Therefore, when the gap G1 is not filled, the millimeter wave transmission performance may be reduced due to the air in the gap G1, but in this embodiment, such a reduction in millimeter wave transmission performance is suppressed. Is done.

  Further, in at least the irradiation region Z1 (see FIG. 2) of the decorative main body portion 31 and the heater portion 55, the thickness T in the front-rear direction of the emblem 30 is a value satisfying the above formula 1 and is uniform. For this reason, the amount of attenuation when the millimeter wave 26 is transmitted is smaller than that in which the thickness T is not uniform.

  Therefore, since the attenuation amount when the millimeter wave 26 passes through the emblem 30 is small as described above, the function of the millimeter wave radar device 25 that measures the inter-vehicle distance and the distance to the obstacle using the millimeter wave 26. Can be fully exhibited.

  By the way, when snow adheres to the front surface of the emblem 30, an electronic control device (not shown) controls energization of the heating element 57 through the electrode 61 based on the detection value of the thermistor 62. Due to this energization, the heating element 57 generates heat. Part of the heat generated by the heating element 57 is transmitted to the front surface of the emblem 30 and melts the snow attached to the front surface.

  It should be noted that, by controlling the temperature of the heater unit 55 by the energization control of the electronic control device, the temperature of the heater unit 55 is suppressed from being excessively high, and the decoration main body unit 31 is deteriorated due to the heat of the heating element 57. Is suppressed.

In addition, according to the present embodiment, the following operations and effects can be obtained.
In the present embodiment, the front base material 36 and the rear base material 41 that sandwich the main portion 56 of the heater portion 55 from both front and rear sides are mechanically joined to each other by welding. Therefore, the deterioration of the bonded portion with time is less likely to occur than when the front substrate 36 and the rear substrate 41 are chemically bonded with an adhesive. The state where the front substrate 36 and the rear substrate 41 are joined can be maintained for a long period of time.

  -The resin sheet 63 in the heater part 55 obstructs the transmission of the millimeter wave 26 as much as possible. In this regard, in the present embodiment, the through portion 64 is provided in the non-covered portion of the resin sheet 63 that does not cover the heating element 57, the electrode 61, and the thermistor 62. Therefore, the attenuation of the millimeter wave 26 when passing through the resin sheet 63 can be suppressed as compared with the case where the resin sheet 63 is not provided with the through portion 64.

  -If the hollow 39 by sink marks arises in the rear surface of the front base material 36, the thickness of the emblem 30 will become smaller than the circumference | surroundings in the location, and will deviate from the thickness T represented by the said Formula 1. In this regard, in the present embodiment, the depression 39 is filled with a depression filling portion 43 formed of the same resin material as the base material 35. Therefore, the thickness in the front-rear direction of the emblem 30 in the irradiation region Z1 (see FIG. 2) of the millimeter wave 26 can be made closer to the thickness T of Equation 1 as compared to the case where such a recessed portion 43 is not provided. The effect of the depression 39 due to sinking on the thickness T can be reduced, and also in this respect, attenuation when the millimeter wave 26 passes through the emblem 30 can be reduced.

  The front base material 36 and the rear base material 41 that sandwich the main portion 56 of the heater portion 55 from the front and rear are joined to each other with the heating element 57 sealed, and the base material 35 includes the front base material 36 and the rear base material. There is no gap between the materials 41. Therefore, it is possible to prevent water from entering between the front substrate 36 and the rear substrate 41 and touching the main portion 56 of the heater portion 55.

  Moreover, when the snow adhering to the front surface of the emblem 30 melts, it becomes water and flows down along the front surface. The same applies when rain, muddy water, or the like adheres to the front surface of the emblem 30. In this regard, in this embodiment, both the electrode 61 and the thermistor 62 are disposed at a location higher than the irradiation region Z1 of the millimeter wave 26 and are kept away from the water flowing down as described above. Therefore, it is possible to make the electrode 61 and the thermistor 62 difficult to touch water compared to the case where the electrode 61 and the thermistor 62 are disposed at a position lower than the irradiation region Z1.

As a result, adverse effects caused by contact with water, for example, corrosion of the electrode 61 and the thermistor 62 can be suppressed.
When the heating element 57 is heated by energization, the temperature of the heating element 57 tends to be lower at the lower part of the heating element 57 and higher at the upper side.

  On the other hand, based on the detected value of the thermistor 62, the electronic controller controls energization to the heating element 57, thereby adjusting the temperature of the heater unit 55 and suppressing the deterioration of the decoration main body 31 due to the heat of the heating element 57. The

  In this regard, in the present embodiment, as described above, the thermistor 62 is arranged at a location higher than the irradiation region Z1 of the millimeter wave 26, and therefore the temperature of the heating element 57 at the location where the temperature is high. It is detected by the thermistor 62. Therefore, compared with the case where the thermistor 62 is disposed at a position lower than the irradiation region Z1, the energization amount to the heating element 57 can be reduced, and the deterioration of the decoration main body 31 due to the heat of the heating element 57 can be effectively suppressed. Can do.

  -If the front end 30c of the emblem 30 (decoration main body part 31) is located behind the front end 17a of the lower adherence part 17, a part of the lower adherence part 17 (curved part 18) is a decoration main body. Projects forward from the portion 31. Therefore, when a part of the snow adhering to the front surface of the emblem 30 is melted by the heat of the heater portion 55, the portion where the snow is not melted may accumulate on the protruding portion of the lower adherend portion 17.

  In this regard, in this embodiment, as shown in FIG. 3, the front end 30 c of the emblem 30 (decoration main body portion 31) is located in front of the front end 17 a of the lower coating portion 17. The portion 17 (curved portion 18) does not protrude forward from the decorative main body portion 31. Therefore, when a part of the snow adhering to the front surface of the emblem 30 is melted by the heat of the heater portion 55, the portion where the snow is not melted flows down without accumulating on the lower adherend portion 17.

  In addition, the said embodiment can also be implemented as a modification which changed this as follows. In this modification, the same elements as those described in the above embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the above-described embodiment, the recess filling portion 43 is configured by a part of the rear base material 41, but may be formed separately from the base material 35 using the same resin material as the base material 35. In this case, the recess filling portion 43 may be formed by resin molding so that the recess 39 is filled after the formation of the front substrate 36. Moreover, the hollow filling part 43 which has the shape which fills the hollow 39 is created beforehand as another member, and after the shaping | molding of the front base material 36, the said hollow filling part 43 with respect to the hollow 39 by heat welding, ultrasonic welding, etc. You may make it join.

  In any of the above cases, the main portion 56 of the heater portion 55 is bonded to the rear surface of the front substrate 36 in which the recess 39 is filled with the recess filling portion 43. When the rear base material 41 is molded, since the recess 39 is already filled, the through portion 64 connected to the recess 39 may be omitted. Of course, the penetrating part 64 connected to the recess 39 and the penetrating part 64 not connected may be left without being omitted.

Also in this case, the rear substrate 41 is formed, so that the substrate 35 does not have a gap portion that contacts the main portion 56 of the heater portion 55.
The emblem 30 may be attached to the front grill 11 having the lower adherend portion 17 shown in FIG. The lower adherend portion 17 has an inclined surface 19 that becomes lower toward the front side. In this case, the emblem 30 (decoration main body portion 31) is attached to the adherend portion 13 with its front end 30c positioned above the inclined surface 19 of the lower adherend portion 17. The angle α formed by the inclined surface 19 with respect to the horizontal plane is set to a value larger than 0 ° and smaller than 90 °. A preferable range of the angle α is 10 to 20 °.

  In this way, when a part of the snow adhering to the front surface of the emblem 30 is melted by the heat of the heater section 55, the melted water and the remaining part of the snow that remains unmelted on the inclined surface 19. Flows down along. Therefore, it is possible to suppress snow from accumulating on the lower adherend portion 17.

  -As a millimeter wave attenuation | damping suppression aspect of said (2), only one of the electrode 61 and the thermistor 62 may be integrated in the heater part 55 in the location remove | deviated from the irradiation area Z1 of the millimeter wave 26 in the heater part 55. FIG.

  -As a millimeter wave attenuation suppression mode of (2) above, on the condition that at least one of the electrode 61 and the thermistor 62 is a location that is out of the irradiation region Z1 of the millimeter wave 26 in the heater section 55, the irradiation region Z1 It may be incorporated in the heater part 55 at a side or at a position lower than the irradiation area Z1.

  -As a millimeter wave attenuation | damping suppression aspect of said (3), the linear part 58 of the heat generating body 57 may be integrated in the heater part 55 in the state which inclined with respect to the polarization plane 27 different from the orthogonal state. Even in this case, the area where the millimeter wave 26 is in contact with the linear portion 58 is smaller than when the linear portion 58 is parallel to the polarization plane 27. The amount by which the transmission of the millimeter wave 26 is hindered by the straight portion 58 is reduced, and an effect of reducing the attenuation amount of the millimeter wave 26 can be obtained.

  -Unlike the said embodiment, the structural member of the heater part 55 is integrated in the heater part 55 by the millimeter wave attenuation | damping suppression aspect of only one of the millimeter wave attenuation | damping suppression aspects of said (1)-(4). Alternatively, the heater unit 55 may be incorporated in a millimeter-wave attenuation suppression mode in which two or more are combined.

  -As the main part 56 of the heater part 55, what formed the linear heating element which consists of a transparent conductive film on the transparent resin sheet 63 may be used. The heating element in the transparent conductive film is formed, for example, by using ITO (indium tin oxide) as a material and performing sputtering, vapor deposition, or the like.

  In this case, since it becomes difficult to see the heating element, the heater portion 55 is located in front of the decorative layer 50 and the base material 35 (front base material 36), for example, the front side of the transparent member 32 as shown in FIG. May be arranged. A decrease in the appearance of the emblem 30 due to the visible heating element can be suppressed. In this case, since the heater portion 55 does not have to be sandwiched between the front and rear sides by the base material 35, the base material 35 may not be divided.

  In this case, the heat generated by the heating element of the heater unit 55 is easily transmitted to the snow attached to the front surface of the emblem 30. There is an advantage that snow can be efficiently melted by the heat of the heater section 55. This effect is greatest when the heater portion 55 is disposed in front of the transparent member 32.

  In this case, a structure for hiding the electrode 61 and the thermistor 62 is required. For this, for example, as shown in FIG. 6, a portion having a colored vertical wall portion 21 is adopted as the adherent portion 13. And the emblem 30 is arrange | positioned so that the electrode 61 and the thermistor 62 may be located in the back side of this vertical wall part 21. FIG. If it does in this way, the vertical wall part 21 of the to-be-adhered part 13 will exhibit the function which conceals the electrode 61 and the thermistor 62 which are located in the back side. Therefore, when the emblem 30 is viewed from the front, the electrode 61 and the thermistor 62 are not visible, and the appearance can be prevented from being impaired by the electrode 61 and the thermistor 62.

The wiring pattern of the heating element 57 in the heater unit 55 may be changed to a wiring pattern different from that in the above embodiment.
-Water repellency may be imparted to the front surface of the member located at the forefront of the emblem 30. If it does in this way, it can suppress that the film | membrane of water forms on the front surface of the said member at the time of snow melting by repelling the water adhering to the front surface of the said member, and making the said member difficult to get wet.

  As a means for imparting water repellency, for example, a water repellent film made of an organic coating film, a silicone film, or the like may be formed on the front surface of the member. In addition, a texture may be formed on the molding surface of a mold used when molding the member, or nano-processing may be performed.

Moreover, what has a hard-coat function may be used as said water-repellent film.
The metal layer 52 in the decoration layer 50 may be covered with a corrosion prevention layer made of an acrylic or urethane resin material in order to suppress corrosion.

-The connection part 45 may be abbreviate | omitted.
The millimeter wave 26 may be transmitted along the polarization plane 27 parallel to the vertical plane as in the above embodiment, or transmitted along the polarization plane 27 inclined with respect to the vertical plane. It may be.

-The decoration main-body part 31 may be formed in the plate shape of a shape different from an ellipse.
The means for attaching the emblem 30 to the adherend portion 13 of the front grill 11 is not particularly limited. The emblem 30 may be attached to the adherend 13 by, for example, a clip, a screw, a claw engagement, or the like.

The emblem 30 may be attached to the vehicle body instead of the front grill 11.
The condition that the vehicle decorative component is attached to the front of the vehicle 10 in the transmission direction of the millimeter wave from the millimeter wave radar device 25 to decorate the vehicle 10 and has millimeter wave permeability. In addition, the present invention may be applied to a vehicle decorative part different from the emblem 30.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 13 ... Adhering part, 17 ... Lower adherence part, 17a ... Front end of lower adhering part, 19 ... Inclined surface, 25 ... Millimeter wave radar apparatus, 26 ... Millimeter wave, 27 ... Polarization surface, 30 ... Emblem (vehicle decorative part), 30c ... front end of emblem, 31 ... decorative body part, 55 ... heater part, 57 ... heating element, 58 ... straight part, 59 ... folding part, 61 ... electrode, 62 ... thermistor, Z1 ... Irradiation area.

Claims (10)

In a vehicle, attached in front of the millimeter wave transmission direction from the millimeter wave radar device, decorates the vehicle, and has a decoration main body having millimeter wave permeability, and a heater having a heating element that generates heat when energized. With
At least a part of the members constituting the heater part is a vehicle decorative part that is incorporated in the heater part in a millimeter wave attenuation suppressing mode that suppresses attenuation when the millimeter wave passes through the heater part. At least a part of the heating element is arranged in the irradiation area of the millimeter wave in the heater part,
The heating element, as the millimeter-wave attenuation suppression mode, the area ratio of the heating element in the irradiation region in the irradiation region is set so that the attenuation amount of the millimeter wave is equal to or less than an allowable value. The vehicle decorative component according to claim 1, which is incorporated in the heater portion.   The heating element is incorporated in the heater unit as the millimeter wave attenuation suppression mode so that the area ratio is 10% or less when the allowable value of the attenuation amount of the millimeter wave is 2.5 dB. Item 3. A vehicle decorative part according to Item 2. The heater part includes an electrode and a thermistor as a part of the constituent members,
4. The device according to claim 1, wherein at least one of the electrode and the thermistor is incorporated in the heater portion at a location outside the millimeter wave irradiation region in the heater portion as the millimeter wave attenuation suppression mode. The decorative part for a vehicle according to the item.   The vehicle decorative component according to claim 4, wherein at least one of the electrode and the thermistor is incorporated in the heater portion at a position higher than the irradiation region. The heating element includes a plurality of linear portions extending in parallel with each other, and a folded portion that connects ends of the adjacent linear portions,
The millimeter wave is transmitted so as to vibrate on a plane of polarization.
The vehicular decorative part according to any one of claims 1 to 5, wherein the linear portion is incorporated in the heater portion in an inclined state with respect to the polarization plane as the millimeter wave attenuation suppression mode.   The said linear part is a vehicle decorative component of Claim 6 incorporated in the said heater part in the state orthogonal to the said polarization plane as the said millimeter wave attenuation | damping suppression aspect.   The vehicular decorative part according to claim 6 or 7, wherein the folded portion is incorporated in the heater portion at a location deviating from the millimeter wave irradiation region in the heater portion as the millimeter wave attenuation suppression mode. The decorative main body portion is attached to the adherend portion of the vehicle in an upright state,
The adherent part has a lower adherent part located below the decorative body part,
The decoration main body is attached to the adherend in a state where the front end in the transmission direction is the same as the front end of the lower adherend or is positioned in front of the front end of the lower adherend. The decorative part for vehicles of any one of Claims 1-8. The decorative main body portion is attached to the adherend portion of the vehicle in an upright state,
The adherent part has a lower adherent part located below the decorative body part,
The lower adherend has an inclined surface that becomes lower toward the front side in the transmission direction,
The said decoration main-body part is attached to the said adherence part in the state which located the front end in the said transmission direction above the said inclined surface of the said lower adherence part. Vehicle decorative parts as described in 1.

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