Light-transmitting panels for vehicles

Abstract

To provide a light-transmitting panel for vehicles that can minimize damage to the vehicle's appearance. [Solution] The luminescent emblem 13 is positioned outside the light source 12 and constitutes a part of the vehicle's design surface, and transmits light L1 emitted from the light source 12 through a plurality of holes 50 formed by laser processing. The luminescent emblem 13 comprises a resin base material 20 that is transparent to visible light and a decorative layer 40 positioned on the design surface 13a side of the base material 20. The plurality of holes 50 penetrate the decorative layer 40 in the front-rear direction. In the front-rear direction, a protective layer 30 is provided between the base material 20 and the decorative layer 40, which is transparent to visible light and protects the base material 20 from laser light.

Description

[Technical Field]

[0001] This invention relates to a light-transmitting panel for vehicles. [Background technology]

[0002] Conventionally, in a light-transmitting panel for vehicles in which a decorative layer is laminated on the surface of a substrate that has visible light transmittance, it has been proposed to form a plurality of holes in the decorative layer that can transmit light in order to transmit light from a light source located on the back side of the substrate toward the outside of the light-transmitting panel for vehicles. An example of such a light-transmitting panel for vehicles is the display device described in Patent Document 1. This display device has a display as a light source, a smoked plate as a substrate, and a screen as a decorative layer. The screen also has a plurality of micro-holes that can transmit light emitted from the display. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2001-331132 [Overview of the project] [Problems that the invention aims to solve]

[0004] Incidentally, in such vehicle-mounted transparent panels, it is conceivable to form multiple holes by laser processing. However, in this case, the following problem arises. That is, when forming multiple holes, if the decorative layer is not sufficiently removed by the laser beam, the light will be obstructed by the remaining decorative layer. Therefore, it is conceivable to form multiple holes such that some of them reach the interior of the substrate. However, in this case, the surface of the substrate is roughened by the laser beam, creating fine irregularities on the surface. As a result, the irregularities of the substrate may be visible from the outside, potentially impairing the appearance of the vehicle-mounted light-transmitting panel. [Means for solving the problem]

[0005] This document describes various embodiments of light-transmitting panels for vehicles that address the above-mentioned problems. [Aspect 1] A light-transmitting panel for a vehicle, which is positioned outward from a light source and constitutes a part of the design surface of the vehicle, and transmits visible light emitted from the light source through a plurality of holes formed by laser processing, comprising a resin substrate having visible light transmittance and a decorative layer positioned on the design surface side of the substrate, wherein the plurality of holes penetrate the decorative layer in the thickness direction, and in the thickness direction, a protective layer is provided between the substrate and the decorative layer that has visible light transmittance and protects the substrate from laser light.

[0006] According to the above configuration, when forming multiple holes by laser processing, the laser beam is irradiated from the decorative layer side onto the laminate, which is stacked in the order of base material, protective layer, and decorative layer. As a result, the areas of the decorative layer where the laser beam is absorbed are removed first. On the other hand, since the base material is protected by the protective layer, the surface of the base material is less likely to absorb the laser beam. Therefore, the formation of fine irregularities on the surface of the base material by roughening it with laser beam is suppressed. Consequently, the appearance of the vehicle light-transmitting panel can be prevented from being damaged by these irregularities being visible from the outside.

[0007] [Aspect 2] The light-transmitting panel for a vehicle according to [Aspect 1], wherein the protective layer comprises a base resin having visible light transmittance and a filler dispersed in the base resin that reflects the laser light.

[0008] With the above configuration, the laser light is reflected by the filler in the base resin, making it less likely for the laser light to be absorbed by the base resin. As a result, the protective layer is less likely to be removed by the laser light, and the surface of the protective layer is less likely to be roughened by the laser light. In addition, as a result, the laser light is less likely to reach the surface of the substrate. Therefore, roughening of the substrate surface by the laser light is suppressed. In other words, the substrate is protected by the protective layer.

[0009] Thus, with the above configuration, a protective layer can be easily realized by dispersing a laser-reflecting filler in the base resin. [Aspect 3] The protective layer comprises a base resin having visible light transmittance and a filler dispersed in the base resin that absorbs the laser light, wherein the filler has higher heat resistance than the substrate, as described in [Aspect 1].

[0010] When multiple holes are formed by thermal processing using laser light, the area of ​​the protective layer where the laser light is absorbed is heated, and the area surrounding that area is also heated by heat conduction. In this configuration, a filler with higher heat resistance than the substrate is dispersed in the base resin. Therefore, even if laser light is absorbed by the base resin, the efficiency of heat conduction in the area of ​​the base resin where the laser light is absorbed is reduced by the filler. As a result, the protective layer is less likely to be removed by laser light, and the surface of the protective layer is less likely to be roughened by laser light. In addition, laser light is less likely to reach the surface of the substrate. Consequently, roughening of the substrate surface by laser light is suppressed. In other words, the substrate is protected by the protective layer.

[0011] Thus, with the above configuration, a protective layer can be easily realized by dispersing a filler with higher heat resistance than the substrate in the base resin. [Aspect 4] The decorative layer comprises a colored layer containing a coloring agent and an opacity layer laminated on the side opposite to the design surface of the colored layer, and containing a coloring agent with higher opacity than the coloring agent contained in the colored layer, as described in any one of [Aspect 1] to [Aspect 3].

[0012] According to the above configuration, visible light incident on the vehicle light-transmitting panel from the outside is reflected by the colored layer, so that the design surface of the vehicle light-transmitting panel is visible from the outside in a color corresponding to the color of the colored layer.

[0013] Further, according to the above configuration, among the light incident on the light transmissive panel for vehicle from the outside, the light transmitted through the coloring layer is reflected or absorbed in the shielding layer. Therefore, components such as a light source disposed inside the vehicle light transmissive panel are less likely to be visually recognized from the outside.

[0014] Therefore, the appearance of the light transmissive panel for vehicle when the light source is not lit can be improved. [Aspect 5] The light transmissive panel for vehicle forms a part of the design surface of the outer shell of the vehicle, and the Martens hardness of the shielding layer is 30 N / mm 2 The light transmissive panel for vehicle according to [Aspect 4], which is as follows.

[0015] When the light transmissive panel for vehicle forms a part of the design surface of the outer shell of the vehicle, the light transmissive panel for vehicle is likely to be damaged by flying stones or the like during vehicle travel. If damage occurs in the light transmissive panel for vehicle and reaches, for example, the shielding layer, when the light source is lit, the light from the light source may leak from the damaged portion of the light transmissive panel for vehicle, which may damage the appearance of the light transmissive panel for vehicle.

[0016] In this regard, according to the above configuration, the Martens hardness of the shielding layer is 30 N / mm 2 or less. Therefore, the impact acting on the light transmissive panel for vehicle by flying stones or the like is alleviated in the shielding layer. As a result, damage is less likely to occur in the shielding layer. Consequently, leakage of light from the damaged portion is suppressed when the light source is lit. Therefore, it is possible to suppress the appearance of the light transmissive panel for vehicle from being damaged when the light source is lit due to damage caused by flying stones or the like.

[0017] [Aspect 6] The light transmissive panel for vehicle forms a part of the design surface of the outer shell of the vehicle. When the protective layer is the first protective layer, a second protective layer for protecting the shielding layer is provided on the design surface side of the shielding layer, and the Martens hardness of the second protective layer is 30 N / mm 2 or less. The light transmissive panel for vehicle according to [Aspect 4], which is as follows.

[0018] When the light-transmitting panel for a vehicle forms part of the design surface of the outer shell of the vehicle, the light-transmitting panel for the vehicle is likely to be damaged by flying stones or the like during vehicle travel. And if the damage thus caused reaches, for example, the concealment layer, when the light source is lit, light from the light source may leak out from the damaged portion of the light-transmitting panel for the vehicle, which may impair the appearance of the light-transmitting panel for the vehicle.

[0019] In this regard, according to the above configuration, due to the provision of the second protective layer, it becomes more difficult for damage caused by flying stones or the like to reach the concealment layer. By the way, in such a protective layer, the smaller the martensite hardness is set, the easier it is for the impact acting on the light-transmitting panel for the vehicle by flying stones or the like to be alleviated by the protective layer. In this regard, according to the above configuration, the martensite hardness of the second protective layer is 30 N / mm 2 or less. Therefore, the impact acting on the light-transmitting panel for the vehicle by flying stones or the like is alleviated by the second protective layer. As a result, it becomes less likely for damage to occur in the second protective layer and, consequently, in the concealment layer. As a result, leakage of light from the damaged portion during lighting of the light source is suppressed. Therefore, it is possible to suppress the impairment of the appearance of the light-transmitting panel for the vehicle during lighting of the light source due to damage caused by flying stones or the like.

[0020] [Aspect 7] On the side opposite to the base material with the decorative layer interposed therebetween in the thickness direction, a filling layer that is filled in the plurality of hole portions and has visible light transmittance is provided, and the filling layer is the second protective layer, the light-transmitting panel for a vehicle according to [Aspect 6].

[0021] According to the same configuration, due to the provision of the filling layer, it is possible to suppress damage occurring in the light-transmitting panel for the vehicle by flying stones or the like from reaching the concealment layer. Thereby, it is possible to further suppress the impairment of the appearance of the light-transmitting panel for the vehicle during lighting of the light source due to damage caused by flying stones or the like.

[0022] Furthermore, with the above configuration, the filling layer functions as a second protective layer. Therefore, the number of layers in the vehicle's light-transmitting panel can be reduced compared to the case where a separate second protective layer is provided. Thus, it is possible to suppress the complexity of the layer structure of the vehicle's light-transmitting panel while suppressing any deterioration in appearance. [Effects of the Invention]

[0023] According to the present invention, it is possible to suppress damage to the appearance of a vehicle light-transmitting panel. [Brief explanation of the drawing]

[0024] [Figure 1] Figure 1 is a front view showing a light-emitting emblem as one embodiment of a light-transmitting panel for vehicles. [Figure 2] Figure 2 is a cross-sectional view showing a magnified view of one of the multiple holes in the luminous emblem shown in Figure 1. [Figure 3] Figure 3 is a photograph showing the state of light leakage for each test specimen in light leakage test 1 for the examples and comparative examples. [Figure 4] Figure 4 is a photograph showing the state of light leakage for each test specimen in light leakage test 2 for the examples and comparative examples. [Modes for carrying out the invention]

[0025] Hereinafter, an embodiment of a light-transmitting panel for vehicles will be described with reference to Figures 1 and 2. In this embodiment, the present invention is embodied as a light-emitting emblem for vehicles. In the following description, the longitudinal direction of a vehicle will be simply referred to as the longitudinal direction, and the front and rear in the longitudinal direction will be simply referred to as the front and rear.

[0026] As shown in Figures 1 and 2, a light source 12 and a light-emitting emblem 13 positioned in front of the light source 12 are attached to the front part 11 of the vehicle. The light source 12 is composed of a light-emitting element such as a light-emitting diode (LED). The light source 12 is mounted on the vehicle so as to emit visible light forward. In other words, in this embodiment, the front-rear direction of the vehicle corresponds to the direction of emission of visible light from the light source 12. Hereafter, the visible light emitted from the light source 12 may be simply referred to as light L1 to distinguish it from visible light irradiated from the outside.

[0027] The luminous emblem 13 constitutes part of the exterior panel of the vehicle's outer shell. When attached to the vehicle, the luminous emblem 13 is plate-shaped with thickness in the front-to-rear direction (see Figure 2). The outer edge shape of the luminous emblem 13 is circular when viewed from the front (see Figure 1).

[0028] As shown in Figure 1, the design surface 13a of the luminous emblem 13 is composed of a display area 14 that displays a mark facing outwards from the vehicle, and a background area 15 that serves as the background other than the display area 14. Here, "mark" refers to, for example, designed letters (logotype) that indicate the vehicle manufacturer's name, model name, grade name, etc., a figure (symbol mark) that symbolizes the vehicle manufacturer, etc., or a logo mark that is a combination of letters and figures. In this embodiment, the display area 14 is composed of a letter portion 14a that shows the English letter "A" and an annular portion 14b that extends along the outer edge of the luminous emblem 13 and surrounds the letter portion 14a.

[0029] As shown in Figure 2, the luminescent emblem 13 comprises a base material 20, a protective layer 30, a decorative layer 40, and a filling layer 60. (Base material 20) The base material 20 is formed from a transparent resin material that transmits visible light. For example, transparent resins such as polypropylene (PP) and polycarbonate (PC) can be used as the resin material forming the base material 20. In this embodiment, the base material 20 is made of PP. The base material 20 is positioned on the side of the luminescent emblem 13 opposite to the design surface 13a (in this embodiment, the rear). More specifically, the base material 20 is positioned at the very rear of the luminescent emblem 13 and mainly constitutes the rear surface of the luminescent emblem 13. The rear surface 20b of the base material 20 faces the light source 12 in the front-to-back direction.

[0030] (Protective layer 30) As shown in Figure 2, the protective layer 30 is a resin layer that protects the substrate 20 from laser light and is laminated on the front surface 20a of the substrate 20. The "laser light" referred to here is laser light of a wavelength emitted from well-known lasers used for stripping processes, such as YAG lasers and carbon dioxide lasers, for example, light with wavelengths of 1064 nm (NIR laser), 532 nm (green laser), 355 nm (UV laser), or approximately 9.2 μm to 10.8 μm (FIR laser).

[0031] In this embodiment, a primer layer (not shown) is provided on the front surface 20a of the substrate 20, from the viewpoint of improving adhesion between the protective layer 30 and the substrate 20. The protective layer 30 is a coating film formed by applying a coating, in which a filler 32 is dispersed in a base resin 31 that is transparent to visible light, onto the primer layer. As the base resin 31, well-known resin materials included in synthetic resin coatings such as acrylic resin, urethane resin, epoxy resin, silicone resin, polyester resin, and melamine resin can be used.

[0032] As the filler 32, for example, a filler that reflects laser light can be used. Examples of laser light reflecting fillers include metallic conductive fillers such as aluminum flakes. In this embodiment, the filler 32 is aluminum flakes (average particle size: 52 μm). The mass concentration of the filler 32 in the protective layer 30 is, for example, 5% to 30%. It is preferable that the mass concentration of the filler 32 in the protective layer 30 is such that it does not impair the transmittance of light L1 in the protective layer 30. Specifically, it is preferable that it is 5% to 20%.

[0033] (Decorative layer 40) As shown in Figure 2, the decorative layer 40 is used to decorate the luminescent emblem 13 and is positioned on the design surface 13a side (in this embodiment, the front) of the base material 20. The decorative layer 40 has an opacity layer 41 and a colored layer 42 that is colored with a coloring agent such as a pigment or dye.

[0034] The opacity layer 41 is a resin layer containing a colorant with higher opacity than the colorant contained in the coloring layer 42. Specifically, the opacity layer 41 is formed from a resin material in which a white pigment that reflects visible light, such as titanium dioxide, or a black pigment that absorbs visible light, such as carbon black, is dispersed. In this embodiment, the opacity layer 41 is a black coating film formed by applying a paint in which carbon black is dispersed onto the front surface 30a of the protective layer 30. The Martens hardness of the opacity layer 41 is 30 N / mm². 2 The following applies. Furthermore, from the viewpoint of improving chipping resistance, the Martens hardness of the concealing layer 41 is 10 N / mm². 2 Preferably, the following, and especially 5 N / mm 2 The following is even more preferable. The method for measuring Martens hardness is as described in the examples below.

[0035] The colored layer 42 is a resin layer containing a coloring agent. In this embodiment, the colored layer 42 is a colored coating film formed by applying a paint in which pigments of any color are dispersed onto the front surface 41a of the opacity layer 41.

[0036] The luminescent emblem 13 has multiple holes 50 that penetrate the decorative layer 40 in the front-to-back direction, which is the thickness direction of the decorative layer 40. The display area 14 is formed by the multiple holes 50. Each hole 50 penetrates the decorative layer 40, and a part of it (hereinafter referred to as the bottom portion 51) extends to the protective layer 30. That is, the bottom portion 51 of each hole 50 is made up of the protective layer 30. The bottom portion 51 has a bottom surface 51a that constitutes a part of the front surface 30a of the protective layer 30. The bottom surface 51a is provided with an uneven shape formed by laser light.

[0037] (filled bed 60) As shown in Figure 2, the filling layer 60 is provided on the side opposite to the base material 20, with the decorative layer 40 in between in the front-to-back direction. The filling layer 60 has a base layer 61 and a plurality of filling portions 62. The base layer 61 is laminated and bonded to the front surface 42a of the colored layer 42. The filling portions 62 are the parts of the filling layer 60 that are filled into a plurality of holes 50. Each filling portion 62 protrudes rearward from the rear surface 61b of the base layer 61.

[0038] The filling layer 60 is formed from a transparent resin material that transmits visible light. Examples of the resin material used to form the filling layer 60 include transparent resins such as acrylic resin. In this embodiment, the filling layer 60 is formed from PMMA with a coloring agent and is colored and transparent. Any coloring agent can be used, but in this embodiment, the filling layer 60 is formulated with a pigment of a color that is complementary to the color of light L1 from the light source 12 (e.g., blue) (e.g., yellow). This makes it possible to make the color of the light L2 emitted forward from the luminescent emblem 13 achromatic (white) color, which is a mixture of the color of the filling layer 60 and the color of light L1.

[0039] <Operation of this embodiment> When forming multiple holes 50 by laser processing, the laser beam is irradiated from the decorative layer 40 side onto the laminate, which is stacked in the order of base material 20, protective layer 30, and decorative layer 40. As a result, the areas of the decorative layer 40 that absorb the laser beam are removed first. On the other hand, since the base material 20 is protected by the protective layer 30, the laser beam is less likely to be absorbed by the surface of the base material 20 (in this embodiment, the front surface 20a). Therefore, the formation of fine irregularities on the front surface 20a of the base material 20 by roughening with the laser beam is suppressed.

[0040] <Effects of this embodiment> (1) The luminescent emblem 13 is positioned in front of the light source 12 and constitutes part of the vehicle's design surface, and transmits light L1 emitted from the light source 12 through a plurality of holes 50 formed by laser processing. The luminescent emblem 13 comprises a resin base material 20 that is transparent to visible light and a decorative layer 40 positioned on the design surface 13a side of the base material 20. The plurality of holes 50 penetrate the decorative layer 40 in the front-rear direction. In the front-rear direction, a protective layer 30 is provided between the base material 20 and the decorative layer 40 that is transparent to visible light and protects the base material 20 from laser light.

[0041] This configuration produces the effects described above. Therefore, the appearance of the luminous emblem 13 is not impaired by the fact that the above-mentioned irregularities are visible from the outside. (2) The protective layer 30 has a base resin 31 and a filler 32 which is dispersed in the base resin 31 and reflects laser light.

[0042] With this configuration, the laser light is reflected by the filler 32 in the base resin 31, making it difficult for the base resin 31 to absorb the laser light. As a result, the protective layer 30 is less likely to be removed by the laser light, and the surface of the protective layer 30 is less likely to be roughened by the laser light. In addition, as a result, it becomes difficult for the laser light to reach the front surface 20a of the substrate 20. Therefore, roughening of the front surface 20a of the substrate 20 by the laser light is suppressed. In other words, the substrate 20 is protected by the protective layer 30.

[0043] Thus, with the above configuration, the protective layer 30 can be easily realized by dispersing the laser light-reflecting filler 32 in the base resin 31. (3) The decorative layer 40 comprises a colored layer 42 containing a coloring agent and an opacity layer 41 which is laminated on the side of the colored layer 42 opposite to the design surface 13a side (front surface 42a) and contains a coloring agent with higher opacity than the coloring agent contained in the colored layer 42.

[0044] With this configuration, visible light (light L3 in Figure 2) incident on the luminous emblem 13 from the front is reflected by the colored layer 42 (light L4 in Figure 2), causing the design surface 13a of the luminous emblem 13 to be visible from the front in a color corresponding to the color of the colored layer 42.

[0045] Furthermore, with the above configuration, the light L5 that passes through the colored layer 42 of the light L3 incident on the luminous emblem 13 from the front is absorbed by the concealing layer 41. As a result, components such as the light source 12, which are positioned behind the luminous emblem 13, become less visible from the front.

[0046] Therefore, the appearance of the luminous emblem 13 can be improved when the light source 12 is not illuminated. (4) The luminous emblem 13 constitutes part of the design surface of the vehicle's outer shell. The Martens hardness of the concealing layer 41 is 30 N / mm². 2 The following applies:

[0047] When the light-emitting emblem 13 forms part of the design surface of the vehicle's outer shell, the light-emitting emblem 13 is likely to be damaged by flying stones or the like during vehicle travel. If the damage to the light-emitting emblem 13 reaches, for example, the concealment layer 41, when the light source 12 is lit, the light L1 from the light source 12 may leak out from the damaged part of the light-emitting emblem 13, which may impair the appearance of the light-emitting emblem 13.

[0048] In this regard, according to the above configuration, the martensite hardness of the concealment layer 41 is 30 N / mm 2 or less. Therefore, the impact acting on the light-emitting emblem 13 by flying stones or the like is alleviated by the concealment layer 41. As a result, it becomes difficult for the concealment layer 41 to be damaged. Consequently, leakage of the light L1 from the damaged part is suppressed when the light source 12 is lit. Therefore, it is possible to prevent the appearance of the light-emitting emblem 13 from being impaired when the light source 12 is lit due to damage caused by flying stones or the like.

[0049] (5) On the side opposite to the base material 20 with the decorative layer 40 interposed therebetween in the front-rear direction, a filling layer 60 that is filled in a plurality of hole portions 50 and has visible light transmittance is provided. According to such a configuration, the damage caused to the light-emitting emblem 13 by flying stones or the like is suppressed from reaching the concealment layer 41 by the amount of the filling layer 60 provided. As a result, it is possible to further prevent the appearance of the light-emitting emblem 13 from being impaired when the light source 12 is lit due to damage caused by flying stones or the like.

[0050] <Modification Example> This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non-conflicting range.

[0051] · The light-emitting emblem 13 is not limited to the one in which the martensite hardness of the concealment layer 41 is 30 N / mm 2 or less as exemplified in this embodiment, and the martensite hardness of the concealment layer 41 is 30 N / mm 2It may be larger. In this case, for example, forward of the concealing layer 41, the Martens hardness is 30 N / mm². 2 The following settings should be configured, and a second protective layer should be newly provided to protect the concealing layer 41. In this case, the protective layer 30 corresponds to the first protective layer described in the [Means for Solving the Problem] section.

[0052] With this configuration, the presence of the second protective layer makes it less likely for damage from flying stones, etc., to reach the concealment layer 41. Incidentally, in such protective layers, the lower the Martens hardness is set, the easier it is for the protective layer to mitigate the impact acting on the vehicle's light-transmitting panel due to flying stones, etc. In this regard, according to the above configuration, the Martens hardness of the second protective layer is 30 N / mm². 2 The following is the result. As a result, the impact on the luminous emblem 13 caused by flying stones, etc., is mitigated by the second protective layer. This makes it less likely for the second protective layer, and consequently the concealing layer 41, to be damaged. As a result, leakage of light L1 from damaged areas when the light source 12 is lit is suppressed. Therefore, damage caused by flying stones, etc., can be prevented from impairing the appearance of the luminous emblem 13 when the light source 12 is lit.

[0053] The packing layer 60 may also function as a second protective layer according to the above modification example. That is, the Martens hardness of the packing layer 60 may be set to 30 N / mm². 2 You may also set it as follows: With this configuration, the filling layer 60 functions as a second protective layer, thus reducing the number of layers in the luminous emblem 13 compared to when a separate second protective layer is provided. Therefore, it is possible to suppress the complexity of the layer structure of the luminous emblem 13 while suppressing any deterioration in appearance.

[0054] The filler according to the present invention is not limited to those that reflect laser light, such as the filler 32 exemplified in this embodiment. For example, the filler may absorb laser light while having higher heat resistance than the resin material forming the substrate 20. Examples of such fillers include glass flakes such as silica glass (heat resistance temperature: 800°C).

[0055] When multiple holes 50 are formed by thermal processing using laser light, the area of ​​the protective layer 30 where the laser light is absorbed is heated, and the area surrounding that area is heated by heat conduction.

[0056] In this configuration, the base resin 31 contains a filler with higher heat resistance than the substrate 20. Therefore, even when laser light is absorbed by the base resin 31, the efficiency of heat conduction at the point where the laser light is absorbed is reduced by the filler. As a result, the protective layer 30 is less likely to be removed by the laser light, and the surface of the protective layer is less likely to be roughened by the laser light. Consequently, the laser light is less likely to reach the surface (front surface 20a) of the substrate 20. Therefore, roughening of the front surface 20a of the substrate 20 by the laser light is suppressed. In other words, the substrate 20 is protected by the protective layer 30.

[0057] Thus, with the above configuration, the protective layer 30 can be easily realized by dispersing a filler with higher heat resistance than the substrate 20 in the base resin 31. Regarding the luminescent emblem 13, in this embodiment, a configuration in which a protective layer 30 is laminated on a primer layer (not shown) is illustrated. However, the protective layer 30 may be omitted, and a primer layer in which filler 32 is dispersed may be placed between the substrate 20 and the concealing layer 41. In this case, the primer layer corresponds to the protective layer according to the present invention.

[0058] The luminous emblem 13 is not limited to transmitting light L1 directly irradiated from the light source 12, as illustrated in this embodiment. For example, it may transmit visible light indirectly irradiated from the light source 12. In other words, the light source 12 does not have to be mounted on the vehicle so as to emit visible light forward. For example, it may be mounted so as to emit visible light backward, or it may be arranged so as to emit visible light along the vertical or vehicle width direction. In this case, a separately arranged light guide or the like can be used to guide the visible light toward the luminous emblem 13.

[0059] The luminous emblem 13 is not limited to being positioned on the front 11 of the vehicle as illustrated in this embodiment. The luminous emblem 13 may be positioned on the rear or side of the vehicle as long as it is positioned outward from the light source. When positioned on the rear, outward from the light source corresponds to the rear in the front-to-back direction, and when positioned on the side, outward from the light source corresponds to the right or left side in the vehicle width direction.

[0060] The light-transmitting panel for vehicles according to the present invention is not limited to the light-emitting emblem 13 that constitutes a part of the exterior panel as exemplified in this embodiment, but can also be embodied as the exterior panel itself. [Examples]

[0061] The above embodiments will be described in more detail below with reference to examples and comparative examples. [Preparation of test specimens] The test specimens for the examples and comparative examples were prepared as follows.

[0062] (Example 1) A flat sheet of PP (70mm x 150mm x 3mm) was molded as the base material. Kansai Paint's PP primer (product name: SFX3650) was applied to the surface of the molded base material to a dry film thickness (hereinafter simply referred to as film thickness) of 10 μm. Then, Origin's primer (product name: U-03) was applied to a film thickness of 10 μm, and cured by drying at 80°C for 30 minutes. As a result, a test piece was obtained in which the primer layer and the opacity layer were laminated in that order on the surface of the base material.

[0063] (Example 2) A test specimen was obtained in the same manner as in Example 1, except that a primer manufactured by Origin (product name: U-03) was applied to a film thickness of 20 μm.

[0064] (Example 3) A test specimen was obtained in the same manner as in Example 1, except that a primer manufactured by Origin (product name: U-03) was applied to a film thickness of 50 μm.

[0065] (Comparative Example 1) A PP primer manufactured by Kansai Paint Co., Ltd. (product name: SFX3650) was applied to the surface of a substrate prepared in the same manner as in Example 1 to a thickness of 10 μm, and dried at 80°C for 30 minutes. This resulted in a test specimen in which only the primer layer was laminated on the surface of the substrate.

[0066] (Comparative Example 2) Test specimens were obtained in the same manner as in Example 2, except that a primer manufactured by Nippon Paint Co., Ltd. (product name: R241) was used instead of the primer manufactured by Origin Co., Ltd.

[0067] (Comparative Example 3) Test specimens were obtained in the same manner as in Example 3, except that a primer manufactured by Nippon Paint Co., Ltd. (product name: R241) was used instead of the primer manufactured by Origin Co., Ltd.

[0068] [Measurement method] <film thickness> The film thickness of each test specimen in the examples and comparative examples was measured as follows.

[0069] A portion of the test specimen was carved using a carving tool, and a section with a vertical cross-section was obtained using a scalpel. This section was observed with a microscope, and the film thickness of the primer layer and the opacity layer was measured. <Martens hardness> For each test specimen in the examples and comparative examples, the indentation depth and Martens hardness were measured under the following conditions, in accordance with the method for measuring Martens hardness in ISO 14577-1 "Instrumented indentation hardness and material parameters Part 1: Test methods".

[0070] • Measuring device: Fischer Instruments microhardness tester (Fischerscope HM2000 S) • Indenter: Berkovich indenter (triangular pyramid) • Maximum test force: 300mN • Test speed: 300 mN / 20 sec [Chipping resistance evaluation] Each test specimen in the examples and comparative examples was tested and evaluated as follows.

[0071] <Light Leakage Test 1> Gravelo testing was performed in accordance with JASO M104 "Brake Tube Testing Method" or SAE J400 "TEST FOR CHIP RESISTANCE OF SURFACE COATINGS" under the following conditions.

[0072] • Equipment: Suga Test Machinery Co., Ltd. stone chip tester (JA400LAZ) • Test temperature: -30℃ Shot pressure: 0.4 MPa • Distance to the test specimen: 250 mm Shot angle (angle of mounting the test specimen): 90 degrees • Shot material: No. 6 crushed stone as specified in JIS A 5001 "Crushed stone for roads" • Weight of shot material: 300g After the Gravelo test, coating debris was removed from each test specimen, and the specimens were placed on a surface-emitting panel to observe for light leakage (see (a) Comparative Example 1, (b) Comparative Example 2, (c) Comparative Example 3, (d) Example 1, (e) Example 2, and (f) Example 3 in Figure 3). The degree of light leakage was visually evaluated for each test specimen by comparing it with a predetermined appearance standard. Furthermore, by observing sections cut from each test specimen using a microtome under a microscope, it was confirmed that the coating was indented and peeled from the substrate at the damaged areas where light leakage occurred in each test specimen.

[0073] The chipping resistance of each test specimen was evaluated based on a visual assessment of light leakage. The evaluation criteria are as follows: "1": No or very few light-leakage damage areas. Indicates very high chipping resistance.

[0074] "2": Partially damaged areas show light leakage. This indicates high chipping resistance. "3": Light leaks through the damaged areas overall. Although chipping resistance is not high, it is still at a usable level.

[0075] "4": Overall, light leakage occurs in the damaged areas, and the proportion of light leakage is high. This indicates low chipping resistance, which is below the practical lower limit. "5": Overall, light leakage occurs in the damaged areas, and the proportion of light leakage is very high. This indicates very low chipping resistance and makes the product unsuitable for practical use.

[0076] Table 1 shows the evaluation results for chipping resistance for each test specimen, along with the measured film thickness, indentation depth, and Martens hardness.

[0077] [Table 1]

[0078] <Light Leakage Test 2> Except for using No. 7 crushed stone specified in JIS A 5001 "Crushed Stone for Roads" as the shot material, the tests and evaluations were conducted under the same conditions as in light leakage test 1 (see (a) Comparative Example 1, (b) Comparative Example 2, (c) Comparative Example 3, (d) Example 1, (e) Example 2, and (f) Example 3 in Figure 4). Based on the visual evaluation of light leakage, the chipping resistance of each test piece was evaluated. The evaluation results of the chipping resistance evaluation for each test piece, along with the measured film thickness, are shown in Table 2.

[0079] [Table 2]

[0080] [result] As shown in Table 1, the test specimens used in Test 1 showed higher chipping resistance ratings in all three Examples (1 to 3) compared to Comparative Examples (1 to 3).

[0081] Furthermore, as shown in Table 2, in the test specimens used in Test 2, Examples 2 and 3 received higher evaluations for chipping resistance than Comparative Examples 1 to 3, while Example 1 received the same evaluation as Comparative Example 3. This is thought to be due to the fact that the No. 7 crushed stone is lighter in weight than the No. 6 crushed stone, resulting in a greater number of shot blasting materials being used in Test 2 than in Test 1.

[0082] Furthermore, as shown in Tables 1 and 2, in all three Examples 1 to 3, the chipping resistance was evaluated as the thickness of the opacity layer increased. Based on these results, the Martens hardness of the surface of the concealing layer, measured at a test rate of 300 mN / 20 sec, was determined to be 30 N / mm². 2 It was confirmed that excellent chipping resistance can be obtained by setting the following parameters. Additionally, the Martens hardness was set to 30 N / mm². 2 It was confirmed that by setting the following parameters and increasing the film thickness, superior chipping resistance can be obtained. [Explanation of Symbols]

[0083] L1, L2, L3, L4, L5... Light 11...Front part 12...Light source 13…Illuminated Emblem 13a…Design surface 14...Display area 14a... Text section 14b... Ring section 15...Background area 20...Base material 20a...Front 20b…Rear side 30...Protective layer 30a...Front 31…Base resin 32… Filler 40… Decorative layer 41... Concealing layer 41a...Front 42...Colored layer 42a...Front 50...Hole 51...bottom 51a…Bottom surface 60…Filled bed 61…Base layer 61b…Rear side 62... Filling section

Claims

1. A light-transmitting panel for vehicles, positioned outside the light source and forming part of the vehicle's design surface, which transmits visible light emitted from the light source through a plurality of holes formed by laser processing, A resin substrate that is transparent to visible light, The system comprises a decorative layer positioned on the design surface side of the substrate, The multiple holes penetrate the decorative layer in the thickness direction. In the thickness direction, a protective layer is provided between the substrate and the decorative layer, which is transparent to visible light and protects the substrate from laser light. Light-transmitting panels for vehicles.

2. The protective layer comprises a base resin that is transparent to visible light, and a filler dispersed in the base resin that reflects the laser light. A light-transmitting panel for a vehicle according to claim 1.

3. The protective layer comprises a base resin that is transparent to visible light, and a filler dispersed in the base resin that absorbs the laser light. The filler has higher heat resistance than the base material. A light-transmitting panel for a vehicle according to claim 1.

4. The decorative layer comprises a colored layer containing a coloring agent, and an opacity layer laminated on the side opposite to the design surface of the colored layer, and containing a coloring agent with higher opacity than the coloring agent contained in the colored layer. A light-transmitting panel for a vehicle according to any one of claims 1 to 3.

5. The aforementioned light-transmitting panel for the vehicle constitutes a part of the design surface of the outer shell of the vehicle, The Martens hardness of the concealing layer is 30 N / mm². ２ The following is: The vehicle light-transmitting panel according to claim 4.

6. The aforementioned light-transmitting panel for the vehicle constitutes a part of the design surface of the outer shell of the vehicle, When the aforementioned protective layer is referred to as the first protective layer, A second protective layer is provided on the design surface side of the aforementioned concealing layer to protect the concealing layer. The Martens hardness of the second protective layer is 30 N / mm². ２ The following is: The vehicle light-transmitting panel according to claim 4.

7. In the thickness direction, on the side opposite to the substrate with respect to the decorative layer, a filling layer is provided that fills the multiple holes and is transparent to visible light. The filling layer is the second protective layer. The vehicle light-transmitting panel according to claim 6.

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