TWI820491B - Operation device - Google Patents

Abstract

An object of the invention is to provide technology that can improve the operability of a structure to which a cosmetic cover is attached. A main body 100 has a front panel 120. A revolving shaft 200 projects forward from the front panel 120. An operation knob cover 300 is a cylindrical cover which covers the revolving shaft 200 from the front. An internal cover 400 into which the operation knob cover 300 is inserted has an inner through hole 410 which restricts forward movement of the operation knob cover 300, covers the front panel 120 from the front, and is attached to the main body. A cosmetic cover 500 has an outer through hole 510 into which the operation knob cover 300 is inserted, covers the internal cover 400 from the front, and is attached to the main body 100.

Description

operating device

The present invention relates to an operating device, and in particular to an operating device operated by an operator.

Dimmers adjust the dimming level of lighting fixtures. Furthermore, the dimmer is required to turn on/off the lighting while changing the dimming level. Therefore, a rotary variable resistor is provided, the dimming level of the lighting is controlled according to the resistance value of the variable resistor, and the switch is turned on/off by pressing the switch panel (for example, refer to Patent Document 1) .

[Process technical documentation first]

〔Patent documents〕

[Patent Document 1] Utility Model Registration No. 3205170

Although it is usually inoperable, if an operable button is provided as needed, a decorative cover is used to cover the surface of the dimmer. If the decorative cover is installed, the buttons cannot be operated, but if the decorative cover is removed, the buttons can be operated. There is a need to improve the operability of such a dimmer.

The present invention was made in view of the above-described situation, and an object thereof is to provide a technology for improving operability in a structure in which a decorative cover is installed.

In order to solve the above problems, an operating device according to one aspect of the present invention includes: a main body having a front panel; a rotating shaft protruding from the front panel to the front side; and an operating knob cover that is cylindrical and covers the rotating shaft from the front side. ; The inner cover is installed on the main body while covering the front panel from the front side, and has an inner through hole that prevents the operation knob cover from moving forward while the operation knob cover is inserted; and the decorative cover is It is installed on the main body while covering the inner cover from the front side, and has an outer through hole for inserting the operating knob cover. The front panel is provided with a button area that can be pressed from the front side, and the inner cover has a through area for the purpose of pressing the button area with the decorative cover removed from the main body. The decorative cover system covers the button area and the through area.

According to the present invention, the operability in a structure equipped with a decorative cover can be improved.

100:Ontology

110: Front body

112:Rear body

120: Front panel

130:Button area

140: Upper side wall

142: Left side wall

144: Lower side wall

146: Right side wall

150: Upper side hole

154: Lower side hole

170: First through hole

180:First mounting hole

182: Second mounting hole

184:Third mounting hole

200: Rotating shaft (operating knob)

202: Fixed components

210: Electronic circuit substrate

210a: First electronic circuit substrate

210b: Second electronic circuit substrate

220: Setting button

230:Light source

300: Operating knob cover

400:Inner cover

410:Inside through hole

420: Through area

470: First protrusion

472:Second protrusion

474: Groove part

480: First mounting claw

484:Third mounting claw

500: Decorative cover

510:Outside through hole

540: Upper side protruding piece

542: Left protruding piece

544: Lower side protruding piece

546:Protruding piece on the right side

550: Upper claw

554: Lower claw

560:Removal groove

570: Second through hole

600:Frame

650:Tools

1000: Operating device

1(a)-(c) are exploded perspective views showing the structure of the operating device according to the embodiment of the present invention.

2(a)-(c) are diagrams showing the structure of the operating device of FIGS. 1(a)-(c) when viewed from the front side.

Figures 3(a)-(c) are diagrams showing the structure of the inner cover of Figures 1(a)-(c).

Figure 4 is a diagram showing the light guide through the inner cover of Figures 3(a)-(c).

5(a)-(b) are diagrams showing another structure of the operating device of FIG. 1(a)-(c).

Before describing the embodiment of the present invention in detail, an outline of the embodiment will be described first. This embodiment relates to an operating device such as a dimmer. The operating device includes a rotatable, non-insulated operating knob and a pressable button. In order to ensure the insulation of the operating knob, the operating knob is covered with an insulating operating knob cover. In addition, in order to prevent the button from being pressed when the operating knob cover falls off from the operating knob, a decorative cover is installed to prevent the operating knob cover from falling off and cover the button.

When the decorative cover is removed, the button can be pressed. However, in this state, the operating knob cover may easily come off, and there is a concern that the operating knob may be exposed. In the operating device according to this embodiment, an inner cover is installed that prevents the operating knob cover from falling off from the operating knob and allows the button to be pressed, and a decorative cover is installed to cover the inner cover. A decorative cover system covers the buttons. In such a structure, when the decorative cover is removed, the button can be pressed, but the operating knob cover will not fall off.

In order to enable status notification in the operating device, a light source is provided in the operating device. However, in the case of the dual structure of the inner cover and the decorative cover, it is difficult for the light from the light source to be transmitted to the outside of the operating device. Although it is sufficient to provide a dedicated light guide plate in order to guide the light from the light source, in an operating device that requires miniaturization, it is difficult to install a dedicated light guide plate. In the operating device according to this embodiment, a through hole is provided in the decorative cover, and the inner cover is formed of a transmissive material. from light source Light will be transmitted through the inner cover and output to the outside from the through hole of the decorative cover. In the following explanation, "parallel" and "perpendicular" include not only completely parallel and perpendicular, but also include deviations from parallel or perpendicular within the error range. Also, "roughly" means the same within a rough range.

1(a)-(c) are exploded perspective views showing the structure of the operating device 1000. 1(a)-(b) are exploded perspective views in different directions, and FIG. 1(c) is an exploded perspective view of the body 100 in FIGS. 1(a)-(b) further exploded. 2(a)-(c) show the structure of the operating device 1000 when viewed from the front side. Figure 2(a) shows the structure of the operating device 1000 equipped with the decorative cover 500. Figure 2(b) shows the operating device 1000 with the decorative cover 500 removed but equipped with the inner cover 400. Figure 2 ( c) shows the operating device 1000 after the decorative cover 500 and the inner cover 400 are removed. 3(a)-(c) show the structure of the inner cover 400. In particular, Figure 3(a) is a perspective view of the inner cover 400, Figure 3(b) schematically shows the surface structure of the inner cover 400 when viewed from the front side, and Figure 3(c) is the view of Figure 3(b). Sectional view of line A-A'. The operating device 1000 is a dimmer for controlling a lighting load to a lighting state, a lighting-off state, or a dimming state. The operating device 1000 is not limited to a dimmer, and may also be a switch that controls the load of the ventilation fan.

As shown in Figure 1(a)-(c), they define an orthogonal coordinate system composed of an x-axis, a y-axis, and a z-axis. The x-axis and y-axis systems are orthogonal to each other. The z-axis is perpendicular to the x-axis and the y-axis, and extends in the height direction of the operating device 1000 . In addition, the positive directions of the x-axis, y-axis, and z-axis are defined as the directions of the arrows in Figure 1(a)-(c), and the negative directions are defined as the directions opposite to the arrows. The positive direction of the z-axis is called "upper", sometimes also called "upper side", and the negative direction of z-axis is called "lower", sometimes also called "lower side". The positive direction of the x-axis is called "front", sometimes also called "front side", and the negative direction of x-axis is called "rear side", sometimes also called "rear side". The positive direction of the y-axis is called "right", sometimes also called "right side", and the negative direction of y-axis is called "left", sometimes also called "left side". Therefore, the z-axis is an axis extending in the up-down direction, the x-axis is an axis extending in the front-rear direction, and the y-axis is an axis extending in the left-right direction.

The operating device 1000 includes: a main body 100, a rotating shaft 200, an operating knob cover 300, an inner cover 400 and a decorative cover 500. The body 100 has a box-shaped shape in which the front body 110 arranged on the front side and the rear body 112 arranged on the rear side are combined. The internal structure of the body 100 will be described later. On the front side of the body 100, a rectangular front panel 120 is developed in the y-z plane. The outer peripheral edge portion of the front panel 120 is surrounded by the upper side wall portion 140 , the left side wall portion 142 , the lower side wall portion 144 , and the right side wall portion 146 . The upper side wall portion 140 , the left side wall portion 142 , the lower side wall portion 144 and the right side wall portion 146 all protrude forward from the front panel 120 and are sometimes collectively referred to as wall portions. The upper side wall portion 140 is disposed on the upper side portion of the front panel 120 and extends in the left-right direction. The left side wall portion 142 is disposed on the left portion of the front panel 120 and extends in the up-and-down direction. The lower side wall portion 144 is disposed on the lower side portion of the front panel 120 and extends in the left-right direction. The right side wall portion 146 is disposed on the right portion of the front panel 120 and extends in the up-and-down direction.

In the center part of the front panel 120, a rod-shaped rotation shaft 200 protruding forward is arranged. The rotating shaft 200 is a shaft that can rotate in the y-z plane and is formed of a non-insulating member such as brass. By rotating the rotating shaft 200, for example, dimming control of a lighting load is performed. The rotation shaft 200 is covered by the operating knob cover 300 from the front side. The operation knob cover 300 has a cylindrical shape that expands toward the rear side, and has a cylindrical shape that is closed at the front side. The operation knob cover 300 is formed of an insulating member such as resin. The user rotates the rotating shaft 200 by twisting the operating knob cover 300 and rotating it.

The inner cover 400 has a plate shape developed in the y-z plane, and is installed on the front body 110 of the body 100 while covering the front panel 120 from the front side. The installation of the inner cover 400 to the front body 110 will be described later. In the central portion of the inner cover 400, an inner through hole 410 with a circular opening is arranged. The inner through hole 410 is for the operation knob cover 300 installed on the rotating shaft 200 to be inserted. In addition, since the radius of the opening of the inner through hole 410 is smaller than the radius of the rear side end of the operating knob cover 300, it can suppress The operation knob cover 300 moves forward. That is, as long as the inner cover 400 is installed on the main body 100 , the operation knob cover 300 can be prevented from falling off from the rotating shaft 200 .

The decorative cover 500 has a plate shape expanded in the y-z plane, and is installed on the front body 110 of the body 100 while covering the inner cover 400 from the front side. The installation of the decorative cover 500 on the front body 110 will be described later. The decorative cover 500 is installed on the main body 100 while sandwiching the inner cover 400 . In the central part of the decorative cover 500, an outer through hole 510 with a circular opening is arranged. The outer through hole 510 is for the operation knob cover 300 installed on the rotating shaft 200 to be inserted.

An upper protruding piece 540 , a left protruding piece 542 , a lower protruding piece 544 and a right protruding piece 546 are arranged on the outer peripheral edge of the decorative cover 500 . The upper protruding piece 540 , the left protruding piece 542 , the lower protruding piece 544 and the right protruding piece 546 all protrude to the rear side, and are sometimes collectively referred to as protruding pieces. The upper protruding piece 540 is arranged on the upper part of the decorative cover 500 and extends in the left-right direction. The left protruding piece 542 is arranged on the left part of the decorative cover 500 and extends in the up-down direction. The lower protruding piece 544 is arranged on the lower side part of the decorative cover 500 and extends in the left-right direction. The right protruding piece 546 is arranged on the right part of the decorative cover 500 and extends in the up-down direction. When the decorative cover 500 is installed on the body 100, the upper protruding piece 540 covers the upper side wall 140, the left protruding piece 542 covers the left side wall 142, and the lower protruding piece 544 covers the lower side wall 144. , the right protruding piece 546 covers the right side wall 146 .

The inside of the body 100 includes a first electronic circuit substrate 210a and a second electronic circuit substrate 210b, collectively referred to as the electronic circuit substrate 210. The first electronic circuit substrate 210a is disposed above the second electronic circuit substrate 210b. The first electronic circuit board 210 a and the second electronic circuit board 210 b have a plate shape developed in the x-y plane, and are arranged in the direction toward the rear side from the front panel 120 . The first electronic circuit substrate 210a and the second electronic circuit substrate 210b sandwich the rotation shaft 200 and are connected.

The rotating shaft 200 is fixed to the front body 110 through the fixing member 202 . The fixing member 202 is a nut and is disposed between the front panel 120 and the inner cover 400 . Since the fixing member 202 will receive the stress when the rotation shaft 200 is rotated, the stress will not be transmitted to the electronic circuit substrate 210 . As a result, the connection between the rotation shaft 200 and the electronic circuit board 210 can be maintained even if the electronic circuit board 210 is not arranged in the direction in which the y-z plane develops.

The setting button 220 is arranged on the second electronic circuit board 210b. In front of the setting button 220, the button area 130 of the front panel 120 is arranged. The button area 130 is an area that can be pressed from the front side, and can be said to be a cover for the setting button 220 . The inner cover 400 has a penetration area 420 at a position corresponding to the button area 130 . The through area 420 is, for example, a notch, but may also be a through hole. When the decorative cover 500 is removed from the main body 100 , the user can press the button area 130 through the through area 420 . In addition, when the decorative cover 500 is installed on the main body 100, it covers the button area 130 and the through area 420.

Inside the body 100, a light source 230 is arranged on the first electronic circuit substrate 210a. The light source 230 is, for example, an LED (Light Emitting Diode). In the front panel 120 , the first through hole 170 is arranged at a position corresponding to the light source 230 , and in the decorative cover 500 , the second through hole 570 is arranged at a position corresponding to the light source 230 . Furthermore, in the inner cover 400 , the first protruding portion 470 and the second protruding portion 472 are arranged at positions corresponding to the light source 230 . The first protruding part 470 has a rod shape and extends toward the rear side, and the second protruding part 472 has a rod shape and extends toward the front side. When the inner cover 400 and the decorative cover 500 are installed on the body 100, the first protruding part 470 is inserted into the first through hole 170, and the second protruding part 472 is inserted into the second through hole 570.

Here, since the inner cover 400 is made of a transmissive material, the inner cover 400 guides the light emitted from the light source 230 to the outside through the first protruding portion 470 and the second protruding portion 472 . . Furthermore, the inner cover 400 has a groove portion 474 around the second protruding portion 472 . Figure 4 shows light guidance through the inner cover 400. As shown in the figure, the light emitted from the light source 230 is guided to the front side by the first protruding portion 470 and the second protruding portion 472 . The groove portion 474 suppresses light incident from the first protruding portion 470 from diffusing in directions other than the second protruding portion 472 .

5(a)-(b) show another structure of the operating device 1000. Figure 5(a) is a cross-sectional view when the inner cover 400 and the decorative cover 500 are installed on the main body 100. As shown in FIG. 3(a) , the inner cover 400 includes a first mounting claw 480 , a second mounting claw (not shown), and a third mounting claw 484 extending rearward. Furthermore, as shown in FIG. 2(c) , the front panel 120 includes a first mounting hole 180 , a second mounting hole 182 and a third mounting hole 184 . Here, the first mounting claw 480 and the first mounting hole 180 , the second mounting claw and the second mounting hole 182 , the third mounting claw 484 and the third mounting hole 184 are arranged at corresponding positions. As shown in FIG. 5(a) , the third mounting claw 484 is inserted into the third mounting hole 184 . Furthermore, the second mounting claw is inserted into the second mounting hole 182 . Thereby, the inner cover 400 is installed on the main body 100 .

The upper protruding piece 540 has an upper claw portion 550 on a surface on the upper wall portion 140 side, and the lower protruding piece 544 has a lower claw portion 554 on a surface on the lower wall portion 144 side. The upper wall part 140 is connected to the surface of the upper protruding piece 540 side and has an upper hole part 150 for mounting the upper claw part 550. The lower side wall part 144 is connected to the surface of the lower protruding piece 544 side and has an upper hole part 150 for mounting the lower claw part 550. The lower hole portion 154 of the claw portion 554. The decorative cover 500 is installed on the main body 100 by inserting the upper claw portion 550 into the upper hole portion 150 and inserting the lower claw portion 554 into the lower hole portion 154 . Under such a situation, even if the decorative cover 500 is pulled forward, the decorative cover 500 will not be removed from the main body 100 .

FIG. 5( b ) shows the structure when the operating device 1000 is installed in the frame 600 . A detachment groove 560 is provided in the right protruding piece 546 of the decorative cover 500 . The disassembly groove 560 is a long opening in the up and down direction. The tool 650 can be inserted into the disassembly groove 560. By inserting the tool 650 into the disassembly groove 560 and rotating the tool 650 in a clockwise direction, the upper protruding piece 540 in Figure 5(a) will deform upward and the lower side will protrude. The piece 544 deforms downward, causing the upper claw portion 550 to detach from the upper hole portion 150 and the lower claw portion 554 to detach from the lower hole portion 154 . In this state, if the decorative cover 500 is moved forward, the decorative cover 500 will be removed from the main body 100 .

According to the embodiment of the present invention, even if the decorative cover 500 is removed, the inner cover 400 is still disposed, so the operation knob cover 300 can be prevented from falling off. Furthermore, when the decorative cover 500 is removed, the button area 130 is exposed through the through area 420 of the inner cover 400, so the button area 130 can be pressed. Furthermore, when the decorative cover 500 is removed, since the inner cover 400 having the penetration area 420 is disposed, the button area 130 can be pressed while preventing the operating knob cover 300 from falling off. In addition, since the button area 130 can be pressed while preventing the operating knob cover 300 from falling off, operability in a structure in which the decorative cover 500 is installed can be improved.

In addition, since the operating knob cover 300 of the insulating member covers the rotation shaft 200 of the non-insulating member, contact with the non-insulating member can be prevented. In addition, since the rotating shaft 200 receives rotational stress, pressing stress, and tensile stress applied to the operating knob cover 300 from the outside, it is not necessary to firmly fix the electronic circuit board 210 inside the body 100 . In addition, since the electronic circuit board 210 is arranged in the direction from the front panel 120 to the rear side, the area of the electronic circuit board 210 can be enlarged relative to the size of the main body 100 . In addition, since the area of the electronic circuit substrate 210 is enlarged, more electronic components can be mounted.

In addition, even if the decorative cover 500 is grasped from the outside with fingers, the claw portion will not fall off, so the decorative cover can be prevented from being removed with fingers. Furthermore, since the decorative cover can be prevented from being removed with fingers, meaningless operations on the button area 130 can be prevented. In addition, since the removal groove 560 into which the tool 650 can be inserted is provided, the "decorative cover 500 that cannot be removed by pinching with fingers" can be removed by pushing from bottom to top.

In addition, since the transparent inner cover 400 includes the first protruding portion 470 and the second protruding portion 472, the light emitted from the light source 230 can be guided to the outside. In addition, even if it is covered by the decorative cover 500 and the inner cover 400, light can be guided to the outside, so the operability in the structure in which the decorative cover 500 is installed can be improved. Since the inner cover 400 has a light-guiding function, components can be arranged in a smaller space, thereby saving space. Since the inner cover 400 has the groove portion 474 around the second protruding portion 472, light can be effectively guided.

An outline of one aspect of the present invention is as follows. An operating device (1000) of one aspect of the present invention includes: a body (100) with a front panel (120); a rotating shaft (200) protruding from the front panel (120) toward the front; and an operating knob cover (300 ), is cylindrical, and covers the rotating shaft (200) from the front side; the inner cover (400) covers the front panel (120) from the front side and is installed on the body (100) at the same time, and has an inner through hole ( 410), which suppresses the movement of the operating knob cover (300) to the front side while inserting the operating knob cover (300); and a decorative cover (500), which covers the internal cover (400) from the front side. At the same time, it is installed on the body (100) and has an outer through hole (510) for the operating knob cover (300) to be inserted. The front panel (120) is provided with a button area (130) that can be pressed from the front side, and the inner cover (400) has a through area (420) for the purpose of removing the decorative cover (500) from the main body (100). ) is removed and press the button area (130). The decorative cover (500) covers the button area (130) and the through area (420).

The rotating shaft (200) is a non-insulating member, and the operating knob cover (300) is an insulating member.

The operating device (1000) may further include a fixing member (202) to fix the rotating shaft (200) and the body (100). The fixing member (202) may also be disposed between the front panel (120) and the inner cover (400).

The operating device (1000) may further include an electronic circuit substrate (210) disposed inside the body (100). The electronic circuit substrate (210) is connected to the rotation shaft (200), and the electronic circuit substrate (210) can also be arranged in the direction from the front panel (120) to the rear side.

The outer peripheral edge portion of the front panel (120) may also be provided with wall portions (140, 144) protruding toward the front side, and the outer peripheral portion of the decorative cover (500) may also be provided with wall portions (140, 144) protruding toward the rear side. The protruding pieces (540, 544) covering the wall portions (140, 144) can also be provided with claw portions (550, 550, 544) on the walls (140, 144) side of the protruding pieces (540, 544). 554), the surface of the wall portion (140, 144) on the protruding piece (540, 544) side may also be provided with a hole portion (150, 154) for mounting the claw portion (550, 554).

When the protruding pieces (540, 544) are called first protruding pieces (540, 544), the outer peripheral edge of the decorative cover (500) may also be provided with a rearward protruding piece, which is different from The second protruding piece (546) of the first protruding piece (540, 544) may also be equipped with a disassembly groove (560) into which a tool (650) can be inserted.

Another aspect of the invention is also an operating device (1000). This device includes: a main body (100) with a front panel (120); a rotating shaft (200) protruding from the front panel (120) to the front side; an operating knob cover (300), which is cylindrical and covered from the front side The rotating shaft (200); the inner cover (400) is installed on the body (100) while covering the front panel (120) from the front side, and has an inner through hole (410) for operating the knob cover (300). ) is inserted while suppressing the movement of the operating knob cover (300) to the front side; and a decorative cover (500), which is installed on the main body (100) while covering the internal cover (400) from the front side, and has The outer through hole (510) is used for operating the screw The button cover body (300) is inserted. A light source (230) is arranged inside the body (100). A first through hole (170) is arranged in the front panel (120) at a position corresponding to the light source (230). The decorative cover (500) , a second through hole (570) is disposed at a position corresponding to the light source (230), and the inner cover (400) is disposed with a first protruding portion (170) inserted into the first through hole (170). 470), and the second protruding part (472) inserted into the second through hole (570), the inner cover (400) passes through the first protruding part (470) and the second protruding part (472). Light emitted from the light source (230) is directed to the outside.

The inner cover (400) may also have a groove portion (474) around the second protruding portion (472).

As above, the present invention has been described based on the Examples. Those with ordinary knowledge in the technical field should understand that this embodiment is only an example, and various modifications can be made in the combination of each component or each processing process, and such modifications also belong to the scope of the present invention. .

100:Ontology

110: Front body

112:Rear body

120: Front panel

130:Button area

140: Upper side wall

142: Left side wall

144: Lower side wall

146: Right side wall

170: First through hole

200:Rotation axis

202: Fixed components

210a: First electronic circuit substrate

210b: Second electronic circuit substrate

220: Setting button

230:Light source

300: Operating knob cover

400:Inner cover

410:Inside through hole

420: Through area

500: Decorative cover

510:Outside through hole

540: Upper side protruding piece

542: Left protruding piece

544: Lower side protruding piece

546:Protruding piece on the right side

570: Second through hole

1000: Operating device

Claims (7)

An operating device containing: Body, with front panel; A rotating shaft protrudes forward from the front panel; The operating knob cover is cylindrical and covers the rotating shaft from the front side; The inner cover is installed on the body while covering the front panel from the front side, and has an inner through hole. The inner through hole prevents the operation knob cover from moving forward while allowing the operation knob cover to be inserted. movement; and The decorative cover is installed on the main body while covering the inner cover from the front side, and has an outer through hole for the operating knob cover to be inserted; The front panel is provided with a button area that can be pressed from the front side; The inner cover includes a through area, the purpose of which is to press the button area when the decorative cover is removed from the body; The decorative cover system covers the button area and the through area. The operating device as described in claim 1, wherein, The rotating shaft is a non-insulated component; The operating knob cover is an insulating component. The operating device as described in claim 1 or 2 further includes: A fixing component to fix the rotating shaft and the body; The fixing component is disposed between the front panel and the inner cover. The operating device as described in claim 1 further includes: An electronic circuit substrate is arranged inside the body; The electronic circuit substrate is connected to the rotation shaft; The electronic circuit board is arranged along the direction from the front panel to the rear side. The operating device as described in claim 1, wherein, A wall portion protruding forward is arranged on the outer peripheral edge of the front panel; A protruding piece protruding toward the rear side and covering the wall is disposed on the outer peripheral edge of the decorative cover; A claw is arranged on the surface of the wall side of the protruding piece; A hole portion for mounting the claw portion is disposed on the surface of the wall portion on the side of the protruding piece. The operating device according to claim 5, wherein, When the protruding piece is called a first protruding piece, a second protruding piece that protrudes rearward and is different from the first protruding piece is arranged on the outer peripheral edge of the decorative cover; The second protruding piece is provided with a disassembly groove into which a tool can be inserted. The operating device as described in claim 1, wherein, A light source is arranged inside the body; In the front panel, a first through hole is arranged at a position corresponding to the light source; In the decorative cover, a second through hole is arranged at a position corresponding to the light source; In the inner cover, a first protruding portion inserted into the first through-hole and a second protruding portion inserted into the second through-hole are arranged; The inner cover system guides the light emitted from the light source to the outside via the first protruding part and the second protruding part.

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