Outdoor unit

Abstract

An outdoor unit of an air conditioning device (1) includes a housing (30) on which an opening (35) for maintenance is formed, and a substrate (42) disposed within the housing (30) and having a first surface (42a) on which an electrical component (41) is disposed and a second surface (42b) opposite to the opening (35). The substrate (42) has a light-transmitting region (60) and a first light source (46), when the second surface (42b) is viewed from the front side, light passes through the light-transmitting region (60) from the first surface (42a) to the second surface (42b), the first light source (46) is provided on the first surface (42a), and the first light source (46) is a surface mount type LED that emits light to the light-transmitting region (60).

Description

Technical Field

[0001] The present disclosure relates to an outdoor unit. Background Art

[0002] The outdoor unit of the air conditioner described in Patent Document 1 includes: a base plate having an LED for fault diagnosis provided on a mounting surface; and a reflector for reflecting the light of the LED. The reflector is provided to reflect the light of the LED toward the inspection port.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Publication No. 2005-195209 Summary of the invention

[0006] -Technical problem to be solved by the invention-

[0007] As a method for visually confirming the light of the LED on the substrate, there is a method of transmitting the light of the lead-type LED along the thickness direction of the substrate toward the back side of the mounting surface on which the LED is mounted, that is, the soldering surface. In this method, a groove is sometimes provided on the mounting surface to make a part of the substrate thinner. By emitting light toward the groove, it is easy to visually confirm the light of the LED that has passed through the substrate.

[0008] However, for example, in order to mount a lead-type LED, soldering needs to be performed on the soldering surface. Furthermore, when a groove is provided on the mounting surface to make the substrate thinner, this portion cannot be effectively utilized. As a result, when an LED is provided on the substrate, the design freedom of the substrate cannot be said to be sufficient.

[0009] An object of the present disclosure is to increase the degree of freedom in designing a substrate on which LEDs are provided.

[0010] -Technical solutions to solve technical problems-

[0011] The first aspect relates to an outdoor unit of an air-conditioning device 1, which includes a shell 30 and a substrate 42, wherein the shell 30 is formed with an opening 35 for maintenance, the substrate 42 is arranged in the shell 30, and has a first surface 42a on which a specified electrical component 41 is arranged and a second surface 42b opposite to the opening 35, the substrate 42 has a light-transmitting area 60 and a first light source 46, when the second surface 42b is observed from the front, light passes through the light-transmitting area 60 from the first surface 42a to the second surface 42b, the first light source 46 is arranged on the first surface 42a, and the first light source 46 is a surface-mounted LED that emits light to the light-transmitting area 60.

[0012] In the first aspect, since the first light source 46 is a surface-mounted LED, soldering of the second surface 42 b is not required, and there is no need to provide a thin-walled portion as in the case of mounting a lead-type LED. As a result, the board surface of the substrate 42 can be effectively utilized.

[0013] According to a second aspect, in addition to the first aspect, the light-transmitting region 60 is a region where light-transmitting suppressing materials 50 a and 50 b for suppressing light transmission between the first surface 42 a and the second surface 42 b are not provided.

[0014] In the second aspect, the area where the light-transmitting suppressing materials 50a and 50b are not provided can be used as the light-transmitting area. Thus, the light of the first light source 46 emitting light toward the area where the light-transmitting suppressing materials 50a and 50b are not provided passes through the substrate 42, so the light of the first light source 46 can be visually confirmed when observing the second surface 42b from the front.

[0015] In the third aspect, based on the first or second aspect, the first light source 46 includes a light-emitting portion 46a and a light-emitting substrate 46b, the light-emitting portion 46a has an LED element, the light-emitting substrate 46b is arranged on the first surface 42a and controls the light emission of the light-emitting portion 46a, and the light-emitting portion 46a is arranged adjacent to the light-emitting substrate 46b in the direction along the first surface 42a.

[0016] In the third aspect, as the first light source 46 , a side-view chip LED can be used.

[0017] In the fourth aspect, based on the first or second aspect, the first light source 46 includes a light-emitting portion 46a and a light-emitting substrate 46b, the light-emitting portion 46a has an LED element, the light-emitting substrate 46b controls the light emission of the light-emitting portion 46a, and the light-emitting portion 46a is arranged between the first surface 42a and the light-emitting substrate 46b.

[0018] In the fourth aspect, as the first light source 46 , a back-emitting chip LED can be used.

[0019] The fifth aspect, based on any one of the first to fourth aspects, further includes a second light source 47 and a light-transmitting inhibition material, wherein the second light source 47 is arranged on the first surface 42a to be separated from the first light source 46 by a specified distance and emits light toward the first surface 42a, and the light-transmitting inhibition material inhibits light transmission between the first surface 42a and the second surface 42b, and the light-transmitting inhibition materials 50a, 50b inhibit the light emitted from the second light source 47 from transmitting between the first surface 42a and the second surface 42b.

[0020] In the fifth aspect, even if the first light source 46 and the second light source 47 are mounted on the first surface 42a, the light of the second light source 47 will not pass through the substrate 42 due to the light-transmitting inhibition materials 50a and 50b, so when the second surface 42b is observed from the front, only the light of the first light source 46 can be visually confirmed. This can prevent, for example, maintenance personnel from mistaking the first light source 46 and the second light source 47. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A piping system diagram of the air conditioning device involved in this embodiment;

[0022] Figure 2 A top cross-sectional view showing the structure of an outdoor unit;

[0023] Figure 3 A front cross-sectional view showing the structure of the outdoor unit;

[0024] Figure 4 A longitudinal sectional view showing the structure of an electrical component unit;

[0025] Figure 5 This is a partial enlarged view of the substrate observed from the pattern surface;

[0026] Figure 6 A side view of a surface-mount LED mounted on a substrate;

[0027] Figure 7 A diagram showing two surface-mount LEDs mounted on a substrate according to a modification example as viewed from the side;

[0028] Figure 8 It is a diagram showing a state where a surface-mount LED according to another embodiment is mounted on a substrate. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the following embodiments are merely examples that are preferred in nature and are not intended to limit the scope of the present invention, its application objects or its use. Each structure of each embodiment, modification, other example, etc. described below can be combined or partially replaced within the scope of the present invention. In the following figures, arrows are used to indicate the up and down, front and back, and left and right directions. Unless otherwise specified, the up and down directions will be described in the directions indicated by these arrows.

[0030] (1) Structure of air conditioning unit

[0031] like Figure 1As shown, the air conditioning device 1 has a refrigerant circuit 5 for circulating a refrigerant to perform a refrigeration cycle. The air conditioning device 1 has an indoor unit 10 and an outdoor unit 20. The indoor unit 10 is arranged indoors. The outdoor unit 20 is arranged outdoors. The indoor unit 10 and the outdoor unit 20 are connected to each other through a gas pipe 6 and a liquid pipe 7. A gas stop valve 8 is connected to the gas pipe 6. A liquid stop valve 9 is connected to the liquid pipe 7.

[0032] (2) Indoor unit

[0033] The indoor unit 10 includes an indoor heat exchanger 11 and an indoor fan 12. The indoor heat exchanger 11 is formed of, for example, a transverse fin-tube heat exchanger. In the indoor heat exchanger 11, the refrigerant flowing through the heat transfer tubes thereof exchanges heat with the air sent by the indoor fan 12.

[0034] (3) Outdoor unit

[0035] like Figures 1 to 3 As shown, the outdoor unit 20 includes an outdoor heat exchanger 21, an outdoor fan 22, an outdoor expansion valve 23, a compressor 24, a four-way reversing valve 25 and an electrical component unit 40. The outdoor heat exchanger 21, the outdoor expansion valve 23, the compressor 24 and the four-way reversing valve 25 are connected by a refrigerant pipe 26.

[0036] The outdoor heat exchanger 21 is composed of, for example, a transverse fin-tube type fin-tube heat exchanger. The outdoor heat exchanger 21 has a plurality of fins 21a and a heat transfer tube 21b. The plurality of fins 21a are arranged at intervals in a direction orthogonal to the air flow direction. The heat transfer tube 21b extends through the fin 21a in the thickness direction. The heat transfer tube 21b is arranged in multiple layers in the vertical direction.

[0037] In the outdoor heat exchanger 21, the refrigerant flowing through the heat transfer tube 21b exchanges heat with the air sent by the outdoor fan 22. The outdoor expansion valve 23 is constituted by, for example, an electronic expansion valve.

[0038] The compressor 24 is composed of a rotary compressor such as a scroll compressor. The four-way reversing valve 25 is a reversing valve for switching between cooling operation and heating operation. During cooling operation, the first valve port P1 of the four-way reversing valve 25 is connected to the second valve port P2, and the third valve port P3 is connected to the fourth valve port P4 ( Figure 1 In the heating operation, the first valve port P1 and the third valve port P3 of the four-way reversing valve 25 are connected, and the second valve port P2 and the fourth valve port P4 are connected ( Figure 1 The state shown by the dotted line in .

[0039] The outdoor unit 20 has a housing 30. The housing 30 has a main housing 30a and a top plate 30b. The main housing 30a is formed in a box shape with an open top surface. In other words, the top surface of the main housing 30a has an opening 35. The top plate 30b is mounted on the main housing 30a to seal the opening 35 of the main housing 30a. The top plate 30b can be mounted and removed relative to the main housing 30a. The opening 35 of the main housing 30a is an example of an opening 35 for maintenance of the outdoor unit 20.

[0040] A partition member 31 extending in the front-rear direction and the up-down direction is arranged inside the main body casing 30a. The partition member 31 partitions the inside of the main body casing 30a into a machine room 32 and a blower room 33.

[0041] The machine room 32 is a space inside the main body casing 30a on the right side of the partition member 31. In the machine room 32, the compressor 24, the four-way switching valve 25, the refrigerant pipe 26, and the electric component unit 40 are arranged.

[0042] The blower chamber 33 is a space inside the main body casing 30a on the left side of the partition member 31. In the blower chamber 33, the outdoor fan 22 and the outdoor heat exchanger 21 are arranged.

[0043] On the rear side wall and the left side wall of the main body case 30a, there are formed an inlet 30c connected to the blower chamber 33. When the outdoor fan 22 is running, the outside air is sucked into the blower chamber 33 from the inlet 30c. On the front side wall of the main body case 30a, there is formed an outlet 30d connected to the blower chamber 33. When the outdoor fan 22 is running, the air in the blower chamber 33 is blown out to the outside from the outlet 30d.

[0044] (4) Electrical component unit

[0045] The electric component unit 40 constitutes a power conversion device for supplying power to the motor of the compressor 24. Figures 2 to 4 As shown, the electric component unit 40 includes a substrate case 43, predetermined electric components 41, a substrate 42, and a surface-mounted LED 46. The electric component unit 40 is arranged near the ceiling plate 30b on the machine room 32 side.

[0046] The substrate case 43 is a box-shaped member having an opening at the top. The substrate case 43 accommodates various electrical components 41 including the substrate 42. The substrate 42 arranged in the substrate case 43 of this embodiment is one sheet. The upper opening of the substrate case 43 faces the lower surface of the top plate 30b.

[0047] The electric components 41 are mounted on the substrate 42. The electric components 41 are control circuit components such as a power transistor, a microcomputer chip for controlling the device, and a memory storing a control program.

[0048] A heat sink (not shown) is provided as a member for suppressing a temperature rise of the electrical component 41 that generates a large amount of heat, such as a power transistor. The heat sink is made of a metal member.

[0049] (4-1)Substrate

[0050] like Figure 4 As shown, the substrate 42 has a mounting surface 42a and a pattern surface 42b. The mounting surface 42a is an example of the first surface 42a. The pattern surface 42b is an example of the second surface 42b. The substrate 42 is arranged so that the pattern surface 42b is opposite to the opening 35 of the main body shell 30a. In other words, the substrate 42 is arranged so that the pattern surface 42b faces upward and the mounting surface 42a faces downward. The substrate 42 of this embodiment is a single layer.

[0051] The mounting surface 42a is provided with electrical components 41 and surface mounted LEDs 46. The details of the surface mounted LEDs 46 are described below. Various connectors 44 are also mounted on the mounting surface 42a. The connectors 44 are used, for example, to connect the output (AC) of an inverter circuit (not shown) to a load (motor).

[0052] A plurality of through holes (hereinafter referred to as through holes 42 c ) are formed in the substrate 42 . The through holes 42 c are formed for the purpose of providing electrical connection between the mounting surface 42 a and the pattern surface 42 b . The terminals of the electric component 41 are soldered to the wiring pattern of the substrate 42 .

[0053] like Figure 5 As shown, a wiring pattern 50a is formed on the pattern surface 42b. By making various electrical components 41 conductive with the wiring pattern 50a, a prescribed circuit is formed. A silk screen paint 50b is applied on the pattern surface 42b. The silk screen paint 50b is a paint used to mark information (prescribed information) such as part number, manufacturer's logo, and manufacturing date on the pattern surface 42b. The wiring pattern 50a and the silk screen paint 50b are examples of light transmission suppression materials 50a and 50b. The light transmission suppression materials 50a and 50b suppress the light transmission between the mounting surface 42a and the pattern surface 42b.

[0054] like Figure 5 and Figure 6 As shown, the substrate 42 has a light-transmitting area 60. The light-transmitting area 60 is an area for light to be transmitted from the mounting surface 42a to the pattern surface 42b when the pattern surface 42b is observed from the front. In other words, the light-transmitting area 60 is an area where pattern wiring or silk-screen paint as light-transmitting suppression materials 50a, 50b is not provided.

[0055] (4-2) Surface-mount LED

[0056] The surface-mounted LED 46 is a light source for notifying maintenance personnel of the operation, communication status, or abnormality of the microcomputer of the substrate 42. The surface-mounted LED 46 is a chip LED provided on the mounting surface 42a. In the present embodiment, when the air conditioner 1 is operating normally, the surface-mounted LED 46 flashes. The surface-mounted LED 46 is an example of the first light source 46.

[0057] like Figure 6 As shown in FIG. 1 , the surface-mount LED 46 of the present embodiment is a side-emitting chip LED. Specifically, the surface-mount LED 46 includes a light-emitting portion 46a and a light-emitting substrate 46b.

[0058] The light-emitting portion 46a is a component for LED to emit light. Specifically, the light-emitting portion 46a has an LED element and a sealing resin. The LED element is sealed in the sealing resin. The sealing resin is a transparent or translucent resin (silicon or epoxy resin, etc.). The sealing resin is formed into a substantially rectangular parallelepiped. The light-emitting substrate 46b controls the light emission of the LED element of the light-emitting portion 46a. The light-emitting substrate 46b is mounted on the mounting surface 42a.

[0059] The light emitting portion 46a is provided adjacent to the light emitting substrate 46b in the direction along the mounting surface 42a. Figure 6 As shown by the arrow in , the light emitting portion 46a emits light toward the mounting surface 42a and also emits light in a direction along the mounting surface 42a.

[0060] The light-emitting portion 46a is arranged so as not to overlap with the wiring pattern 50a or the silk-screen paint 50b when the pattern surface 42b is observed from the front. In other words, the surface-mounted LED 46 emits light toward the light-transmitting area 60. Therefore, a portion of the light of the LED emitted from the light-emitting portion 46a is transmitted from the mounting surface 42a to the pattern surface 42b, and the light of the surface-mounted LED can be visually confirmed from the pattern surface.

[0061] (5) Features

[0062] (5-1) Feature 1

[0063] In the outdoor unit 20 of the present embodiment, the substrate 42 has: a light-transmitting area 60 for transmitting light from the mounting surface 42a (first surface) to the pattern surface 42b (second surface) when the pattern surface 42b (second surface) is observed from the front; and a surface-mounted LED 46 arranged on the mounting surface 42a to emit light to the light-transmitting area 60.

[0064] According to the present embodiment, by setting the light source mounted on the mounting surface 42a as a surface-mounted LED, the design freedom of the substrate 42 can be improved compared to the case of mounting a lead-type LED. Specifically, in the lead-type LED, the two leads connected to the LED need to be welded to the pattern surface 42b via the through hole 42c. In order to make it easy for the light of the LED to transmit, a slit (recess) is formed at a position on the mounting surface 42a opposite to the LED (specifically, between the two leads), thereby locally thinning the substrate 42. When such a lead-type LED is used as a light source, the available area of ​​the mounting surface 42a and the pattern surface 42b becomes narrower, and the design freedom is reduced. However, by using a surface-mounted LED 46, welding of the pattern surface 42b is not required, and a slit does not need to be provided, so the board surface of the substrate 42 can be effectively utilized.

[0065] Furthermore, since the light of the surface-mounted LED 46 emitted to the light-transmitting area 60 passes through the substrate 42 in the thickness direction, the light of the surface-mounted LED 46 can be visually confirmed by observing from the pattern surface 42b. Therefore, the state of the light of the surface-mounted LED 46 can be confirmed simply by opening the top plate 30b of the outdoor unit 20. As a result, the maintenance personnel can easily confirm the operation, communication state, or abnormality occurrence state of the microcomputer of the substrate 42.

[0066] (5-2) Feature 2

[0067] In the outdoor unit ( 20 ) of the present embodiment, the light-transmitting region ( 60 ) is a region where the wiring pattern ( 50 a ) and the silk-screen paint ( 50 b ) (light-transmitting suppressing material) for suppressing light transmission between the mounting surface ( 42 a ) and the pattern surface ( 42 b ) are not provided.

[0068] According to the present embodiment, since the wiring pattern 50 a and the silk screen paint are not provided in the light-transmitting region 60 , the light of the surface-mounted LED 46 is emitted to such a region, so that the light can be visually confirmed from the pattern surface 42 b .

[0069] (5-3) Feature 3

[0070] In the outdoor unit 20 of the present embodiment, the surface-mounted LED 46 is a side-emitting chip LED. Light emitted from the light-emitting portion 46a of the side-emitting LED to the mounting surface 42a can be transmitted along the thickness direction of the substrate 42. In addition, since the LEDs used in the outdoor unit 20 can be unified into side-emitting chip LEDs, it is not necessary to set only the LEDs provided on the substrate 42 to other types of LEDs, thereby reducing the manufacturing cost and the complexity of component management.

[0071] (6) Modification

[0072] A modified example of the outdoor unit (20) of the present disclosure will be described. Hereinafter, a configuration different from that of the above-described embodiment will be described.

[0073] like Figure 7 As shown, two surface-mounted LEDs 46 and 47 are mounted on the mounting surface 42a of the substrate 42 in this example. One surface-mounted LED is referred to as a first surface-mounted LED 46, and the other surface-mounted LED is referred to as a second surface-mounted LED 47. The first surface-mounted LED 46 and the second surface-mounted LED 47 are arranged to be spaced apart from each other by a predetermined distance. The first surface-mounted LED 46 is an example of the first light source 46. The second surface-mounted LED 47 is an example of the second light source 47. The first surface-mounted LED 46 and the second surface-mounted LED 47 have the same structure as the side-emitting LED of the above-mentioned embodiment. The second surface-mounted LED 47 has a light-emitting portion 47a and a light-emitting substrate 47b.

[0074] The first surface-mounted LED 46 is a light source for notifying maintenance personnel of the operation, communication status, or abnormality occurrence status of the microcomputer of the substrate 42. The second surface-mounted LED 47 is, for example, a light source used by the manufacturer to check the quality of the substrate 42 during the manufacturing process of the substrate 42. In other words, the second surface-mounted LED 47 is a light source that maintenance personnel do not need to confirm.

[0075] In the substrate 42 of this example, light transmission suppression materials 50a and 50b are provided to suppress light transmission toward the mounting surface 42a of the second surface-mounted LED 47. Specifically, the light transmission suppression material is a silk-screen paint 50b applied on the pattern surface 42b. The silk-screen paint 50b is applied to the pattern surface 42b at a position corresponding to the portion where the second surface-mounted LED 47 is arranged.

[0076] Thus, even if the second surface-mounted LED 47 emits light, the screen-printed paint 50b can suppress the light from penetrating the substrate 42 toward the mounting surface 42a (see Figure 7 As a result, the maintenance personnel can visually check only the first surface-mount LED 46, thereby preventing the light of the first surface-mount LED 46 from being mistaken for the light of the second surface-mount LED 47.

[0077] (7) Other Implementation Methods

[0078] The above-described embodiment and the above-described modified examples may also adopt the following structures.

[0079] like Figure 8As shown, the surface-mounted LED 46 may also be a back-emitting chip LED. In the back-emitting LED, the light-emitting portion 46a is arranged to be sandwiched between the light-emitting substrate 46b and the mounting surface 42a. The light-emitting substrate 46b is electrically connected to the substrate 42. Light is emitted from the light-emitting portion 46a in the direction toward the mounting surface 42a and along the mounting surface 42a (see Figure 8 ). A portion of the light directed toward the mounting surface 42a passes through the light-transmitting region. That is, even in the case of a back-emitting chip LED, the light transmitted through the substrate 42 can be visually confirmed from the pattern surface 42b.

[0080] The substrate 42 may also be formed by stacking a plurality of substrates 42. In this case, the light-transmitting region 60 is a region for light to be transmitted between the layers. In other words, the light-transmitting region 60 is a region where the wiring pattern 50a and the silk-screen coating 50b are not provided between the layers. Therefore, even if it is a multi-layer substrate 42, by arranging the surface-mounted LED 46 at a position corresponding to the light-transmitting region 60 on the mounting surface 42a, the light of the LED can be visually confirmed from the back side (pattern surface 42b) of the mounting surface 42a.

[0081] In the above-mentioned modification, the light transmission suppression materials 50a, 50b may also be the wiring pattern 50a. Specifically, the second surface-mounted LED 47 may also be arranged on the back side (mounting surface 42a) of the wiring pattern 50a. Thus, the wiring pattern 50a is used to suppress the light from the second surface-mounted LED 47 toward the substrate 42 from passing through the substrate 42.

[0082] The above describes the implementation and variations, but it is known that various changes can be made to the scheme and specific circumstances without departing from the subject matter and scope of the claims. As long as the functions of the objects of the present disclosure are not affected, the above implementation and variations can also be appropriately combined and replaced. The words "first", "second"... mentioned above are used to distinguish the sentences using these words, and do not limit the number and order of the sentences.

[0083] - Industrial Applicability -

[0084] In summary, the present disclosure is useful for an outdoor unit.

[0085] - Explanation of symbols -

[0086] 1 Air conditioning unit

[0087] 20Outdoor unit

[0088] 30 Shell

[0089] 35 Opening

[0090] 41Electrical components

[0091] 42 substrate

[0092] 42a Mounting surface (first surface)

[0093] 42b Pattern side (second side)

[0094] 46 surface-mounted LEDs, first surface-mounted LEDs (first light source)

[0095] 46a Light emitting part

[0096] 46b Luminous substrate

[0097] 47 Second surface mounted LED (second light source)

[0098] 50a, 50b light transmission suppression material

[0099] 60 light transmission area

Claims

1. An outdoor unit, which is an outdoor unit of an air conditioning device (1), characterized in that: The outdoor unit comprises a housing (30) and a base plate (42). The housing (30) is formed with an opening (35) for maintenance. The substrate (42) is arranged in the housing (30) and has a first surface (42a) on which the electrical component (41) is arranged and a second surface (42b) opposite to the opening (35). The substrate (42) has a light-transmitting area (60) and a first light source (46). When the second surface (42b) is observed from the front, light passes through the light-transmitting area (60) from the first surface (42a) to the second surface (42b). The first light source (46) is disposed on the first surface (42a), The first light source (46) is a surface-mounted LED that emits light toward the light-transmitting area (60).

2. The outdoor unit according to claim 1, characterized in that: The light-transmitting region (60) is a region where no light-transmitting suppressing material (50a, 50b) for suppressing light transmission between the first surface (42a) and the second surface (42b) is provided.

3. The outdoor unit according to claim 1 or 2, characterized in that: The first light source (46) comprises a light emitting portion (46a) and a light emitting substrate (46b). The light emitting portion (46a) has an LED element. The light emitting substrate (46b) is disposed on the first surface (42a) and controls the light emission of the LED element. The light emitting portion (46a) is provided adjacent to the light emitting substrate (46b) in a direction along the first surface (42a).

4. The outdoor unit according to claim 1 or 2, characterized in that: The first light source (46) comprises a light emitting portion (46a) and a light emitting substrate (46b). The light emitting portion (46a) has an LED element. The light emitting substrate (46b) is disposed on the first surface (42a) and controls the light emission of the LED element. The light emitting portion (46a) is arranged between the first surface (42a) and the light emitting substrate (46b).

5. The outdoor unit according to any one of claims 1 to 4, characterized in that: The outdoor unit further comprises a second light source (47) and light transmission suppression materials (50a, 50b). The second light source (47) is arranged on the first surface (42a) at a predetermined distance from the first light source (46) and emits light toward the first surface (42a). The light transmission suppressing material (50a, 50b) suppresses light transmission between the first surface (42a) and the second surface (42b), The light transmission suppressing material (50a, 50b) suppresses light emitted from the second light source (47) from transmitting between the first surface (42a) and the second surface (42b).

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