Exterior structure, exterior structure for vehicle, and method for controlling exterior structure

Abstract

The invention provides an exterior structure, an exterior structure of a vehicle, and a control method of the exterior structure. The exterior structure is provided with: a non-translucent part configured so as not to transmit light from the outside; and a light-transmitting part that is disposed around the non-light-transmitting part and that reflects and transmits light. The light emitted to the outside from the non-translucent part includes light reflected by the non-translucent part, and the light emitted to the outside from the translucent part includes light obtained by combining the light reflected by the translucent part and light irradiated from the inside to the translucent part and transmitted through the translucent part. The color difference [Delta] E between light emitted to the outside from the non-light-transmitting part and light emitted to the outside from the light-transmitting part is within 5.

Description

Technical Field

[0001] The present disclosure relates to an exterior structure, an exterior structure of a vehicle, and a control method of the exterior structure. Background Art

[0002] For example, Japanese Patent Publication No. 2022-35593 discloses a light-emitting grille used as a front grille constituting an exterior structure of a vehicle. Such a light-emitting grille has a light-transmitting outer cover and a light-emitting element arranged inside the outer cover. The light-emitting grille emits light at night through the light of the light-emitting element passing through the outer cover.

[0003] The light-emitting grille usually does not emit light during the day. If light from the outside, such as sunlight, is irradiated to the light-emitting grille when the light-emitting element is not emitting light, part of the irradiated light passes through the outer cover and the rest is reflected by the outer cover. On the other hand, in a vehicle, there is a case where a hood is provided adjacent to the light-emitting grille. If light from the outside is irradiated to the hood, the hood reflects most of the irradiated light. Therefore, the appearance of the light-emitting grille is significantly different from the appearance of the hood, and thus there is a problem that the appearance of the vehicle is deteriorated.

[0004] Such a problem is not limited to vehicle exterior structures, but is also generally common to exterior structures other than vehicles that have a non-light-transmitting portion that does not transmit light and a light-transmitting portion that is disposed around the non-light-transmitting portion and reflects and transmits light. Summary of the invention

[0005] The exterior structure involved in one embodiment of the present disclosure includes: a non-light-transmitting portion configured not to allow light from the outside to pass through; and a light-transmitting portion configured to be arranged around the non-light-transmitting portion and to reflect and transmit light from the outside. The light emitted to the outside from the non-light-transmitting portion includes light reflected by the non-light-transmitting portion, and the light emitted to the outside from the light-transmitting portion includes light synthesized by light reflected by the light-transmitting portion and light irradiated from the inside to the light-transmitting portion and transmitted through the light-transmitting portion. The color difference ΔE between the light emitted to the outside from the non-light-transmitting portion and the light emitted to the outside from the light-transmitting portion is within 5.

[0006] The exterior structure of a vehicle according to another embodiment of the present disclosure includes: a non-translucent portion configured not to transmit light from the outside; a translucent portion configured to be arranged around the non-translucent portion and to reflect and transmit light from the outside; and a display light source, which is a display light source arranged inside the translucent portion and configured to illuminate the translucent portion to display. The translucent portion generates a color due to the light emitted by the display light source when the exterior color of the translucent portion is close to the exterior color of the non-translucent portion or when the exterior color of the translucent portion is the same as the exterior color of the non-translucent portion.

[0007] According to another embodiment of the present disclosure, a control method for an exterior structure is provided. The exterior structure includes: a non-light-transmitting portion configured not to allow light from the outside to pass through; a light-transmitting portion configured to be arranged around the non-light-transmitting portion and to reflect and transmit light from the outside; and a light-emitting diode arranged on the inner side of the light-transmitting portion and irradiating visible light. The light emitted from the non-light-transmitting portion to the outside includes light reflected by the non-light-transmitting portion, and the light emitted from the light-transmitting portion to the outside includes light synthesized by light reflected by the light-transmitting portion and light irradiating the light-transmitting portion from the inside and passing through the light-transmitting portion. The control method includes the following steps: causing the light-emitting diode to emit light in such a manner that the color difference ΔE between the light emitted from the non-light-transmitting portion to the outside and the light emitted from the light-transmitting portion to the outside is within 5. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic cross-sectional view showing an exterior structure of a vehicle according to an embodiment.

[0009] Figure 2 yes Figure 1 An enlarged view of a main portion of an exterior structure of a vehicle shown.

[0010] Figure 3 yes Figure 1 The illustrated diagram is an enlarged view of a main part of a second color developing layer included in the vehicle exterior structure. DETAILED DESCRIPTION

[0011] Hereinafter, an embodiment in which the exterior structure is embodied as an exterior structure of a vehicle will be described with reference to the drawings.

[0012] <Structure of vehicle 11>

[0013] like Figure 1As shown, the exterior structure of a vehicle 11 as an example of an exterior structure includes a non-light-transmitting portion 12, a light-transmitting portion 13, a display light source 14, and a housing 15. The non-light-transmitting portion 12 is in a plate shape. As an example, the non-light-transmitting portion 12 constitutes an engine hood 16 located at the front of the vehicle 11. As an example, the light-transmitting portion 13, the display light source 14, and the housing 15 constitute a light-emitting grille 17. The light-transmitting portion 13 is in a plate shape. As an example, the light-transmitting portion 13 constitutes the exterior of the light-emitting grille 17 located at the front of the vehicle 11.

[0014] In the following description, Figure 1 The left side in is defined as the front side, and Figure 1 The right side in the figure is defined as the rear side. In addition, directions represented by terms such as "front", "rear", "up", "down", "left", and "right" are defined based on the vehicle.

[0015] The light-transmitting portion 13 is arranged around the non-light-transmitting portion 12. As an example, the light-transmitting portion 13 is arranged adjacent to the lower side of the non-light-transmitting portion 12. The exterior color of the non-light-transmitting portion 12 and the exterior color of the light-transmitting portion 13 are the same series of colors. At a position behind the light-emitting grille 17 of the vehicle 11, an infrared sensor 18 and a millimeter wave sensor 19 are arranged in a vertical arrangement.

[0016] The infrared sensor 18 transmits infrared rays (near infrared rays) toward the front of the vehicle 11, and receives infrared rays reflected by objects outside the vehicle including the vehicle in front and pedestrians. The infrared rays transmitted by the infrared sensor 18 have a wavelength of 900 nm or more and 2000 nm or less. The infrared sensor 18 identifies the above-mentioned objects based on the infrared rays received and transmitted, and detects the distance and relative speed between the vehicle 11 and the above-mentioned objects. The infrared sensor 18 has the characteristic of being able to detect objects smaller than those that the millimeter wave sensor 19 can detect.

[0017] The millimeter wave sensor 19 transmits millimeter waves toward the front of the vehicle 11, and receives millimeter waves reflected by objects outside the vehicle, including the vehicle in front and pedestrians. The millimeter wave sensor 19 identifies the above objects based on the received millimeter waves, and detects the distance and relative speed between the vehicle 11 and the above objects. Millimeter waves refer to electromagnetic waves with a wavelength of 1mm to 10mm and a frequency of 30GHz to 300GHz. The millimeter wave sensor 19 has the following characteristics: it is strong against bad weather such as rain, fog, and snow, and has a longer detectable distance than the infrared sensor 18.

[0018] <Non-light-transmitting portion 12>

[0019] like Figure 1As shown, the non-light-transmitting portion 12 does not transmit light from the outside, such as sunlight. That is, the non-light-transmitting portion 12 reflects almost 100% of the light from the outside having a wavelength that is not absorbed by the non-light-transmitting portion 12.

[0020] <Light-transmitting portion 13>

[0021] like Figure 1 and Figure 2 As shown, the light-transmitting portion 13 reflects and transmits light from the outside, such as sunlight. That is, the light-transmitting portion 13 reflects a portion of the light of wavelengths not absorbed by the light-transmitting portion 13 among the light from the outside, and transmits the remaining portion. For example, the light-transmitting portion 13 reflects 80% of the light of wavelengths not absorbed by the light-transmitting portion 13 among the light from the outside, and transmits the remaining 20%. As described above, the outer color of the non-light-transmitting portion 12 and the outer color of the light-transmitting portion 13 are of the same series of colors, so the wavelength of the light not absorbed by the non-light-transmitting portion 12 and the wavelength of the light not absorbed by the light-transmitting portion 13 are almost the same.

[0022] The light-transmitting portion 13 includes a plate-shaped transparent resin substrate 20 and a decorative layer 21 laminated on the rear surface of the transparent resin substrate 20. The decorative layer 21 includes a first color-forming layer 22 laminated on the rear surface of the transparent resin substrate 20 and a second color-forming layer 23 laminated on the rear surface of the first color-forming layer 22. The transparent resin substrate 20 is composed of, for example, a polycarbonate (PC) resin, etc. The first color-forming layer 22 is a layer in which a dye or a pigment is contained in a first base resin 24.

[0023] like Figure 2 and Figure 3 As shown, the second color developing layer 23 is a layer in which a filler 26 composed of a cold light mirror film is contained in a second base resin 25. The cold light mirror film has the characteristics of reflecting visible light and transmitting infrared light.

[0024] like Figure 1 and Figure 2 As shown, for the light-transmitting portion 13, it is preferable that the transmittance of visible light having a wavelength of 380 nm to 800 nm is 5% to 20%. If the transmittance of visible light at the light-transmitting portion 13 is less than 5%, the amount of light transmitted through the light-transmitting portion 13 by the display light source 14 may be insufficient. If the transmittance of visible light at the light-transmitting portion 13 exceeds 20%, the reflectance of visible light at the light-transmitting portion 13 becomes too small compared to the reflectance of visible light at the non-light-transmitting portion 12, and thus the difference in appearance between the non-light-transmitting portion 12 and the light-transmitting portion 13 may become greater.

[0025] The light-transmitting portion 13 preferably has a maximum transmittance of infrared light having a wavelength of 900 nm or more and 2000 nm or less of 60% or more. If the maximum transmittance of infrared light at the light-transmitting portion 13 is less than 60%, the detection accuracy of the infrared sensor 18 may be insufficient. The light-transmitting portion 13 preferably has an attenuation rate of a round trip of a millimeter wave of 3.0 dB or less. If the attenuation rate of a millimeter wave during a round trip at the light-transmitting portion 13 exceeds 3.0 dB, the detection accuracy of the millimeter wave sensor 19 may be insufficient.

[0026] <Casing 15>

[0027] like Figure 1 As shown, the housing 15 is in a rectangular box shape having an opening 27 at the front end. The opening 27 of the housing 15 is closed by the transparent resin substrate 20 of the light-transmitting portion 13. The housing 15 has a facing surface 28 facing the light-transmitting portion 13. The decorative layer 21 of the light-transmitting portion 13 is located inside the housing 15.

[0028] The housing 15 is made of, for example, polycarbonate (PC) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, acrylonitrile / ethylene-propylene-diene / styrene (AES) resin, acrylonitrile-styrene-acrylate copolymer (ASA) resin, or the like.

[0029] The upper and lower ends of the facing surface 28 facing the light-transmitting portion 13 in the housing 15 are provided with display light sources 14. That is, the housing 15 accommodates two display light sources 14 inside. Therefore, each display light source 14 is arranged at a position behind (inside) the light-transmitting portion 13. The display light source 14 includes an LED (Light Emitting Diode) 14a for emitting visible light and a control circuit 14b for controlling the LED 14a. The display light source 14 irradiates visible light to the light-transmitting portion 13, thereby utilizing the visible light that passes through the light-transmitting portion 13 to cause text, patterns, etc. to emit light for display.

[0030] The control circuit 14b as a processing circuit can be composed of (1) one or more processors that operate according to a computer program (software), (2) one or more dedicated hardware circuits such as a specific-purpose integrated circuit (ASIC) that performs at least a portion of various processes, or (3) a combination thereof. The processor includes a CPU and a memory such as a RAM and a ROM, and the memory stores program codes or instructions configured to enable the CPU to perform processing. The memory, i.e., a non-temporary computer-readable medium, includes all available media that can be accessed by a general-purpose or special-purpose computer. Various controls based on the control circuit 14b are executed by the CPU executing a program stored in the memory at each predetermined operation cycle.

[0031] <Effects of implementation methods>

[0032] The vehicle 11 usually emits light from the display light source 14 while traveling at night. In this way, the light from the display light source 14 is irradiated to the light-transmitting portion 13, so that characters, patterns, etc. are displayed by light transmitted through the light-transmitting portion 13.

[0033] On the other hand, the vehicle 11 is usually not caused to emit light from the light-transmitting portion 13 to display characters, patterns, etc. during daytime driving, and therefore, the display light source 14 is not caused to emit light. In this way, the light-transmitting portion 13 reflects a portion of the light of wavelengths not absorbed by the light-transmitting portion 13 in the sunlight irradiated from the outside as an example, but transmits the rest of the light. At this time, the non-light-transmitting portion 12 adjacent to the light-transmitting portion 13 reflects almost all of the light of wavelengths not absorbed by the non-light-transmitting portion 12 in the sunlight irradiated. Therefore, the reflectivity of sunlight at the light-transmitting portion 13 is lower than the reflectivity of sunlight at the non-light-transmitting portion 12.

[0034] Therefore, the amount of sunlight reflected by the light-transmitting portion 13 is less than the amount of sunlight reflected by the non-light-transmitting portion 12. That is, there is a difference between the amount of sunlight reflected by the light-transmitting portion 13 and the amount of sunlight reflected by the non-light-transmitting portion 12. If this difference becomes large, even if the exterior color of the light-transmitting portion 13 and the exterior color of the non-light-transmitting portion 12 are of the same series of colors, a significant difference in color is generated between the light-transmitting portion 13 and the non-light-transmitting portion 12. As a result, the boundary between the light-transmitting portion 13 and the non-light-transmitting portion 12 tends to become noticeable, thereby causing the appearance of the vehicle 11 to deteriorate.

[0035] In this regard, in the present embodiment, the display light source 14 is made to emit light during daytime driving of the vehicle 11. Thus, the light emitted to the outside from the light-transmitting portion 13 is light synthesized by the sunlight reflected by the light-transmitting portion 13 and the light irradiated from the display light source 14 arranged on the rear side (inner side) of the light-transmitting portion 13 and transmitted through the light-transmitting portion 13. The light emitted to the outside from the non-light-transmitting portion 12 is the sunlight reflected by the non-light-transmitting portion 12. The control circuit 14b makes the display light source 14 emit light in such a manner that the color difference ΔE between the light emitted to the outside from the non-light-transmitting portion 12 and the light emitted to the outside from the light-transmitting portion 13 is within 5.

[0036] Thus, the light-transmitting portion 13 generates a color when the outer color of the light-transmitting portion 13 is close to the outer color of the non-light-transmitting portion 12 or when the outer color of the light-transmitting portion 13 is the same as the outer color of the non-light-transmitting portion 12. This is because the smaller the color difference ΔE between the light emitted to the outside from the light-transmitting portion 13 and the light emitted to the outside from the non-light-transmitting portion 12, the closer the appearance of the outer color of the non-light-transmitting portion 12 and the outer color of the light-transmitting portion 13 become.

[0037] As a result, the appearance of the light-transmitting portion 13 is very close to the appearance of the non-light-transmitting portion 12 , so the boundary between the light-transmitting portion 13 and the non-light-transmitting portion 12 is less likely to be noticeable. Therefore, the appearance of the vehicle 11 is improved.

[0038] As an example, Figure 2 As shown by the arrows, it is assumed that the amount of incident sunlight 29 incident on each of the light-transmitting portion 13 and the non-light-transmitting portion 12 is made "100" for the wavelengths of light that are not absorbed by the light-transmitting portion 13 and the non-light-transmitting portion 12. In this case, the light-transmitting portion 13 reflects "80" of the incident sunlight 29 as reflected light 30 and transmits the remaining "20" of the incident sunlight 29 as transmitted light 31. On the other hand, the non-light-transmitting portion 12 reflects "100" of the incident sunlight 29 as reflected light 30. In this state, the amount of light emitted to the outside from the light-transmitting portion 13 is "80", and the amount of light emitted to the outside from the non-light-transmitting portion 12 is "100".

[0039] In this case, the light 32 is irradiated from the display light source 14 to the light-transmitting portion 13 so that the amount of light emitted to the outside from the display light source 14 through the light-transmitting portion 13 becomes "20". In this way, the amount of light emitted to the outside from the light-transmitting portion 13 becomes "80+20=100", and therefore the amount of light emitted to the outside from the light-transmitting portion 13 is the same as the amount of light emitted to the outside from the non-light-transmitting portion 12.

[0040] That is, the color difference ΔE between the light emitted to the outside from the light-transmitting portion 13 and the light emitted to the outside from the non-light-transmitting portion 12 becomes 0. Therefore, the exterior color of the light-transmitting portion 13 is the same as the exterior color of the non-light-transmitting portion 12. Therefore, the boundary between the light-transmitting portion 13 and the non-light-transmitting portion 12 becomes inconspicuous, and thus the appearance of the vehicle 11 is improved.

[0041] In addition, the incident light amount of the incident sunlight 29 incident on each of the light-transmitting portion 13 and the non-light-transmitting portion 12 varies depending on the weather. Therefore, a light sensor 41 for detecting the incident light amount of the incident sunlight 29 is provided on the vehicle 11. The control circuit 14b preferably adjusts the light amount of the irradiation light 32 irradiated from the display light source 14 to the light-transmitting portion 13 based on the detection result of the light sensor 41.

[0042] In addition, since the maximum transmittance of infrared rays having a wavelength of 900 nm to 2000 nm is 60% or more, the detection accuracy of the infrared sensor 18 is ensured. Furthermore, since the attenuation rate of the round trip of the millimeter wave is 3.0 dB or less, the detection accuracy of the millimeter wave sensor 19 is ensured. Therefore, the light-transmitting portion 13 also functions as an electromagnetic wave transmission cover.

[0043] <Effects of implementation>

[0044] According to the above-described detailed embodiments, the following effects are achieved.

[0045] (1) The exterior structure of the vehicle 11 includes: a non-translucent portion 12 that does not allow light from the outside to pass through, a translucent portion 13 disposed around the non-translucent portion 12, and a display light source 14 disposed inside the translucent portion 13. The translucent portion 13 reflects a portion of the light of a wavelength not absorbed by the translucent portion 13 among the light from the outside, and transmits the remaining portion. The display light source 14 irradiates light to the translucent portion 13 to cause the translucent portion 13 to emit light for display. The translucent portion 13 generates a color due to the light emitted by the display light source 14 when the exterior color of the translucent portion 13 is close to the exterior color of the non-translucent portion 12 or when the exterior color of the translucent portion 13 is the same as the exterior color of the non-translucent portion 12.

[0046] According to the above configuration, the difference in appearance between the non-light-transmitting portion 12 and the light-transmitting portion 13 is reduced or eliminated, and thus the boundary between the non-light-transmitting portion 12 and the light-transmitting portion 13 becomes less noticeable. Therefore, the appearance of the vehicle 11 can be improved.

[0047] (2) In the exterior structure of the vehicle 11, the light-transmitting portion 13 includes a transparent resin substrate 20, a first color-developing layer 22 containing a dye or a pigment, and a second color-developing layer 23 containing a filler 26 composed of a cold mirror film that reflects visible light and transmits infrared light. The light-transmitting portion 13 has a transmittance of visible light having a wavelength of 380 nm to 800 nm inclusive of 5% to 20% inclusive, a maximum transmittance of infrared light having a wavelength of 900 nm to 2000 nm inclusive of 60% or more, and an attenuation rate of millimeter waves of 3.0 dB or less.

[0048] According to the above structure, the light-transmitting portion 13 does not hinder the transmission of infrared rays and millimeter waves. Therefore, when electromagnetic wave sensors such as infrared sensors 18 and millimeter wave sensors 19 are arranged inside the light-transmitting portion 13, the light-transmitting portion 13 can function as an electromagnetic wave transmission cover for covering the infrared sensors 18 and millimeter wave sensors 19.

[0049] <Change Example>

[0050] The above-mentioned embodiment can be implemented with modifications as follows. In addition, the above-mentioned embodiment and the following modifications can be implemented in combination with each other within the range that there is no technical contradiction.

[0051] The light-transmitting portion 13 does not necessarily need to have a transmittance of visible light having a wavelength of 380 nm to 800 nm of 5% to 20%.

[0052] The light-transmitting portion 13 does not necessarily need to have a maximum transmittance of 60% or more for infrared light having a wavelength of 900 nm to 2000 nm.

[0053] The light-transmitting portion 13 does not necessarily need to set the attenuation rate of the millimeter wave to 3.0 dB or less.

[0054] The light from outside is not limited to sunlight, and may be light from a lighting device installed outdoors or indoors, for example.

[0055] The decorative layer 21 may include at least one of a smoked layer for controlling reflected light and a complementary color layer for controlling generated color.

[0056] The exterior structure of the above-described embodiment may be applied to an exterior structure other than the vehicle 11 , for example, an exterior structure of a building having a non-light-transmitting portion 12 and a light-transmitting portion 13 on an outer wall.

[0057] The outer structure does not necessarily need to have a light source. The light that irradiates the light-transmitting portion 13 from the inside and passes through the light-transmitting portion 13 may be, for example, light from a light source inside the outer structure, or light from outside the outer structure. In the case where the light is light from outside the outer structure, the light is reflected at a position behind (inside) the light-transmitting portion 13, and then irradiates the light-transmitting portion 13 from the inside and passes through the light-transmitting portion 13. Thus, the light emitted from the light-transmitting portion 13 to the outside is a combination of the light from the outside reflected by the light-transmitting portion 13 and the light that irradiates the light-transmitting portion 13 from the inside and passes through the light-transmitting portion 13. Furthermore, the outer structure is configured so that the color difference ΔE between the light emitted from the non-light-transmitting portion 12 to the outside and the light emitted from the light-transmitting portion 13 to the outside is within 5. In this way, the difference in appearance between the non-light-transmitting portion 12 and the light-transmitting portion 13 becomes smaller, so that the boundary between the non-light-transmitting portion 12 and the light-transmitting portion 13 is not easy to become noticeable. Therefore, the appearance of the exterior structure can be improved.

[0058] The exterior structure of the vehicle 11 may be such that a non-light-transmitting portion and a light-transmitting portion are provided adjacent to each other in the light-emitting grille 17 .

Claims

1. An exterior structure, comprising: a non-light-transmitting portion configured to prevent light from outside from passing through; and a light-transmitting portion arranged around the non-light-transmitting portion and configured to reflect and transmit light from the outside, The exterior structure is characterized in that: The light emitted to the outside from the non-light-transmitting portion includes light reflected by the non-light-transmitting portion. The light emitted from the light-transmitting portion to the outside includes light obtained by synthesizing light reflected by the light-transmitting portion and light irradiated from the inside to the light-transmitting portion and transmitted through the light-transmitting portion. A color difference ΔE between the light emitted to the outside from the non-light-transmitting portion and the light emitted to the outside from the light-transmitting portion is within 5.

2. The exterior structure according to claim 1, characterized in that: A display light source is further provided, the display light source being arranged inside the light-transmitting portion and configured to illuminate the light-transmitting portion to cause the light-transmitting portion to emit light and display. The display light source further comprises: a light emitting diode for emitting visible light; and a control circuit configured to control the light emission of the light emitting diode. The control circuit is configured to cause the light emitting diode to emit light so that a color difference ΔE between the light emitted from the non-light-transmitting portion to the outside and the light emitted from the light-transmitting portion to the outside is within 5.

3. An exterior structure of a vehicle, comprising: a non-light-transmitting portion configured to prevent light from the outside from passing through; a light-transmitting portion disposed around the non-light-transmitting portion and configured to reflect and transmit light from the outside; and a display light source disposed inside the light-transmitting portion and configured to illuminate the light-transmitting portion to display the light; The vehicle exterior structure is characterized in that: The light-transmitting portion generates a color due to the light emission of the display light source when the outer color of the light-transmitting portion is close to the outer color of the non-light-transmitting portion or when the outer color of the light-transmitting portion is the same as the outer color of the non-light-transmitting portion.

4. The vehicle exterior structure according to claim 3, characterized in that: The light-transmitting portion comprises: Transparent resin substrate; A first chromogenic layer containing a dye or a pigment; The second color-forming layer contains a filler, wherein the filler is composed of a cold light mirror film that reflects visible light and transmits infrared light. The light-transmitting portion has a transmittance of visible light with a wavelength of 380 nm to 800 nm of 5% to 20% and a maximum transmittance of infrared light with a wavelength of 900 nm to 2000 nm of 60% or more, and a millimeter wave attenuation rate of 3.0 dB or less.

5. The vehicle exterior structure according to claim 3 or 4, characterized in that: The display light source comprises: a light emitting diode that radiates visible light; and a control circuit configured to control the light emission of the light emitting diode. The control circuit is configured to cause the light emitting diode to emit light so that the light transmissive portion generates a color when the exterior color of the light transmissive portion is close to the exterior color of the non-light transmissive portion or when the exterior color of the light transmissive portion is the same as the exterior color of the non-light transmissive portion.

6. A method for controlling an exterior structure, characterized in that: The exterior structure comprises: a non-light-transmitting portion configured to prevent light from outside from passing through; a light-transmitting portion arranged around the non-light-transmitting portion and configured to reflect and transmit light from the outside; as well as a light emitting diode disposed inside the light-transmitting portion and emitting visible light, The light emitted to the outside from the non-light-transmitting portion includes light reflected by the non-light-transmitting portion. The light emitted from the light-transmitting portion to the outside includes light obtained by synthesizing light reflected by the light-transmitting portion and light irradiated from the inside to the light-transmitting portion and transmitted through the light-transmitting portion. The control method includes the step of causing the light emitting diode to emit light so that a color difference ΔE between the light emitted from the non-light-transmitting portion to the outside and the light emitted from the light-transmitting portion to the outside is within 5.

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