Light pipe illumination system capable of adjusting illumination brightness

Abstract

The invention discloses a light guide pipe illumination system capable of adjusting illumination brightness, comprising: a concrete pier base which is bent in an L shape and is arranged in a building main body, and the lower end of the concrete pier base is connected with the outer wall of an indoor side wall; the embedded steel sleeve is arranged in the concrete pier base; the light guide pipe is arranged in the embedded steel sleeve, and the two ends of the light guide pipe extend out of the embedded steel sleeve; the diffuser is arranged at the lower end of the light guide pipe; the lighting cover covers the upper end of the light guide pipe, and the lower end face of the lighting cover abuts against the upper end face of the light guide pipe; the adjusting mechanism is used for adjusting the covering area of the pipe opening position of the light guide pipe. Compared with the prior art, the lighting device has the following advantages and effects that the adjusting structure is arranged on the lighting cover, the shielding area of the pipe opening position of the light guide pipe is adjusted, the intensity of light passing through the light guide pipe is limited, the illumination brightness of the diffuser position is adjusted, and free switching of the fully-opened state, the partially-opened state and the fully-closed state can be achieved; different lighting requirements are met, and the practicability of the lighting system is improved.

Description

Technical Field

[0001] The invention relates to the field of light pipe lighting, and in particular to a light pipe lighting system capable of adjusting light brightness. Background Art

[0002] As a non-electric lighting system, light pipes can use sunlight for indoor lighting in buildings during the day. Compared with traditional lighting systems, light pipes can completely replace daytime electric lighting, without energy consumption and maintenance. The system's lighting source is taken from outdoor natural light, which is soft, uniform, full-spectrum, flicker-free, and glare-free. The anti-ultraviolet coating on the surface of the light cover filters out harmful radiation, making it a truly energy-saving, environmentally friendly, and green lighting method.

[0003] When the traditional light pipe lighting system is in use, sunlight passes through the light cover and is projected along the diffuser into the main body of the building to achieve lighting. However, when used in some special places such as conference rooms, offices or bedrooms, the demand for light during the day is not particularly strong, and the traditional light pipe lighting system does not have the brightness adjustment function, which affects the practicality of the entire system and needs to be improved. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a light pipe lighting system capable of adjusting light brightness, which has the effect of being able to adjust light brightness.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A light guide lighting system capable of adjusting light brightness, comprising: The concrete pier is bent in an L shape and arranged inside the main body of the building, and the lower end is connected to the outer wall of the indoor side wall; The embedded steel sleeve is arranged in the concrete pier, and the lower end of the sleeve extends to the inner wall of the indoor side wall; A light guide tube is arranged in the embedded steel sleeve, and both ends of the light guide tube extend to the outside of the embedded steel sleeve; a diffuser, disposed at the lower end of the light guide tube; A light cover is arranged to cover the upper end of the light guide tube, and the lower end surface of the light cover abuts against the upper end surface of the light guide tube; An adjustment mechanism, used for adjusting the covering area of ​​the light guide tube opening; The adjustment mechanism includes a fixed disk, an adjustment plate and a rotating disk. The fixed disk is arranged in a circular ring shape at the outer edge of the light cover. The fixed disk is provided with a regular hexagonal limiting groove, and the two ends of the limiting groove extend horizontally along the straight direction thereof. There are six adjustment plates, which are arranged in a triangular shape. The tip positions of the adjustment plates are gathered together and are used to cover the light guide tube. A limiting block slidably connected to the limiting groove is provided on the adjustment plate, and the length direction of the limiting block is flush with the length direction of the bottom edge of the adjustment plate. The rotating disk is rotatably connected to the fixed disk and is buckled on the adjustment plate. The rotating disk is provided with a guide groove arranged along its tangent direction, and a guide rod matching the guide groove is provided at the center position of the outer edge of the adjustment plate.

[0006] In a preferred example, the present invention can be further configured as follows: a remote-controlled motor is provided on the skylight, a gear is provided on the remote-controlled motor, and a gear ring meshing with the gear is provided on the outer wall of the rotating disk.

[0007] In a preferred example, the present invention can be further configured as follows: A resin pier seat is arranged in an annular shape on the upper end surface of the concrete pier seat, a mounting ring is arranged on the outer wall of the lower end of the resin pier seat, an anchor bolt is arranged between the mounting ring and the concrete pier seat, and a clamp ring surrounding the outer wall of the skylight hood is arranged on the resin pier seat; A fixing member, disposed at the upper end of the light guide tube and connected to the inner wall of the resin pedestal; A sealing member is arranged between the light cover and the clamping ring.

[0008] In a preferred example, the present invention can be further configured as follows: the fixing part includes a fixing tube, a fixing ring, a hook and a locking ring, the fixing tube is sleeved on the outer wall of the upper end of the light guide tube, the fixing ring is arranged on the outer wall of the fixing tube, the inner wall of the resin pedestal is provided with a supporting seat for supporting the fixing ring, the hook is arranged at the outer edge position of the fixing ring, the supporting seat is provided with a slot for the hook to hook, the locking ring is arranged on the inner wall of the fixing tube, and the light guide tube is provided with a locking hole for the locking ring to be embedded.

[0009] In a preferred example, the present invention can be further configured as follows: an aluminum foil tape is wound between the lower end of the fixed tube and the outer wall of the light guide tube, and a rubber ring is provided on the outer wall of the upper end of the fixed tube to abut against the lower end surface of the light cover.

[0010] In a preferred example, the present invention can be further configured as follows: the sealing member includes a foam rod and a structural rubber ring, the foam rod is annularly arranged between the light hood and the clamping ring, and the structural rubber ring is arranged on the foam rod and located between the light hood and the clamping ring.

[0011] In a preferred example, the present invention can be further configured as follows: a sealing ring is embedded in the lower end surface of the resin pier and contacts the upper end surface of the concrete pier.

[0012] In a preferred example, the present invention can be further configured as follows: an inner waterproof layer is arranged between the outer wall and the upper end surface of the resin pier seat, an outer waterproof layer surrounding the inner waterproof layer is arranged on the outer wall of the resin pier seat, and the upper end of the outer waterproof layer wraps the mounting ring and the clamping ring.

[0013] In a preferred example, the present invention can be further configured as follows: a thermal insulation cotton layer is provided between the lower end outer wall of the light guide tube and the embedded steel sleeve, and a sealing cover surrounding the thermal insulation cotton layer is provided between the lower end outer wall of the light guide tube and the inner wall of the indoor side wall.

[0014] In a preferred example, the present invention can be further configured as follows: a sealing ring is provided between the diffuser and the end face of the light guide tube, a decorative ring is provided on the outer wall of the light guide tube, the end of the decorative ring is bent and pressed against the outer edge position of the diffuser, a buckle is provided on the inner wall of the decorative ring, and a buckle hole for the buckle to be embedded is provided on the light guide tube.

[0015] In summary, the present invention has the following beneficial effects: 1. By setting an adjustment structure on the light cover, the shielding area of ​​the light pipe opening position can be adjusted, thereby limiting the light intensity passing through the light pipe and adjusting the light brightness at the diffuser position. It can realize free switching between fully open, partially open and fully closed states, meet different lighting needs, and improve the practicality of the lighting system; 2. By setting the light guide tube and the resin pier seat connected and fixed by the card connection, the whole light guide tube can be quickly installed and fixed, and the construction efficiency is improved. At the same time, a resin pier seat connected to the concrete pier seat is set, and a space for the skylight hood to be embedded is formed on the resin pier seat, and a sealing member is added between the skylight hood and the resin pier seat to increase the sealing and waterproof properties of the surrounding areas of the skylight hood; 3. By setting up the double coordination of the inner waterproof layer and the outer waterproof layer, the sealing and waterproofness of the surrounding areas of the concrete pier and the resin pier are increased to prevent water seepage and leakage; 4. By providing a decorative collar for clamping and fixing, the diffuser can be pressed and fixed, thereby improving the installation convenience and efficiency of the diffuser. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of Example 1; Figure 2 is a schematic structural diagram of a fixing member and a sealing member of Example 1; Figure 3 is a schematic structural diagram of a light guide and a diffuser in Example 1; Figure 4 is a schematic structural diagram of Example 2; Figure 5 is a schematic structural diagram of the adjustment mechanism of Example 2; Figure 6 It is a schematic diagram of the connection relationship of the adjustment mechanism of Example 2.

[0017] Figure numerals: 1, concrete pier; 2, embedded steel sleeve; 3, light guide; 31, thermal insulation cotton layer; 32, sealing cover; 33, sealing rubber ring; 34, decorative ring; 35, buckle; 36, buckle hole; 4, diffuser; 5, resin pier; 51, mounting ring; 52, anchor bolt; 53, sealing ring; 54, supporting seat; 55, slot; 56, snap ring; 57, inner waterproof layer; 58, outer waterproof layer; 6, fixing piece; 61, Fixed tube; 62, fixed ring; 63, hook; 64, locking ring; 65, locking hole; 66, aluminum foil tape; 67, rubber ring; 7, light cover; 8, seal; 81, foam rod; 82, structural rubber ring; 9, adjustment mechanism; 91, fixed disk; 92, adjustment plate; 93, rotating disk; 931, gear ring; 94, limit groove; 95, limit block; 96, guide groove; 97, guide rod; 98, remote control motor; 981, gear. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0019] Embodiment 1: like Figure 1 , Figure 2 As shown, a light pipe lighting system with adjustable light brightness includes a concrete pier 1, an embedded steel sleeve 2, a light pipe 3, a diffuser 4, a resin pier 5, a fixing part 6, a lighting cover 7 and a sealing part 8.

[0020] like Figure 1 , Figure 2 As shown, the concrete pier 1 is bent in an L shape and arranged in the main body of the building, and the lower end is connected to the outer wall of the indoor side wall, and an installation space is formed inside. The embedded steel sleeve 2 is arranged in the concrete pier 1 and is arranged in an L shape. The lower end of the embedded steel sleeve 2 extends to the inner wall position of the indoor side wall and is flush with the inner wall of the indoor side wall.

[0021] like Figure 1 , Figure 2 As shown, the light guide tube 3 is arranged in the embedded steel sleeve 2, the upper end of the light guide tube 3 extends to the top of the embedded steel sleeve 2, and the lower end extends to the outside of the embedded steel sleeve 2, and the diffuser 4 is arranged at the lower end of the light guide tube 3.

[0022] like Figure 1 , Figure 2 As shown, the resin pier seat 5 is annularly arranged on the upper end surface of the concrete pier seat 1, and a mounting ring 51 is arranged on the lower end outer wall of the resin pier seat 5. An anchor bolt 52 is arranged between the mounting ring 51 and the concrete pier seat 1 to achieve the fixation between the concrete pier seat 1 and the resin pier seat 5. A sealing ring 53 is embedded in the lower end surface of the resin pier seat 5 to abut against the upper end surface of the concrete pier seat 1 to increase the sealing between the two.

[0023] like Figure 1 , Figure 2 As shown, the fixing member 6 is disposed at the upper end of the light guide 3 and connected to the inner wall of the resin pier 5. The fixing member 6 includes a fixing tube 61, a fixing ring 62, a hook 63 and a locking ring 64. The fixing tube 61 is sleeved on the outer wall of the upper end of the light guide 3, the fixing ring 62 is disposed on the outer wall of the fixing tube 61, and the inner wall of the resin pier 5 is provided with a supporting seat 54 for supporting the fixing ring 62.

[0024] like Figure 1 , Figure 2 As shown, the hook 63 is arranged at the outer edge of the fixing ring 62, and the support seat 54 is provided with a slot 55 for the hook 63 to hook. The locking ring 64 is arranged on the inner wall of the fixing tube 61, and the light guide tube 3 is provided with a locking hole 65 for the locking ring 64 to be embedded.

[0025] Therefore, when installing the light guide tube 3, the fixing tube 61 can be sleeved on the outer wall of the light guide tube 3, and the locking ring 64 in the fixing tube 61 can be inserted into the locking hole 65 on the light guide tube 3 to achieve the tie and fixation between the fixing tube 61 and the light guide tube 3. Because the upper surface of the locking ring 64 is a plane and the side wall is an inclined surface, the light guide tube 3 can be hooked tighter under the action of gravity, thereby increasing stability.

[0026] Then the fixing ring 62 is embedded in the supporting seat 54, and the hook 63 is embedded in the slot 55 to achieve the clamping fixation between the fixing tube 61 and the resin pier 5, so that the light guide 3 can be quickly installed and the installation efficiency of the light guide 3 is improved.

[0027] At the same time, after installation, a resin pier 5 that can be connected to the concrete pier 1 is used, and a space for the skylight 7 to be embedded is formed on the resin pier 5, and a sealing member 8 is added between the skylight 7 and the resin pier 5 to increase the sealing and waterproof properties of the skylight 7 around the skylight 7.

[0028] like Figure 1 , Figure 2As shown, an aluminum foil tape 66 is wound between the lower end of the fixing tube 61 and the outer wall of the light guide tube 3 to achieve the connection and fixation between the two, and also to increase the sealing and waterproof properties between the two. The upper end outer wall of the fixing tube 61 is provided with a rubber ring 67 that abuts against the lower end surface of the lighting cover 7 to increase the sealing and waterproof properties of the connection position.

[0029] like Figure 1 , Figure 2 As shown, the skylight 7 is buckled on the resin pier 5, and the lower end face is against the upper end face of the light guide 3. The skylight 7 is a double-layer ultra-white tempered glass, and there is glue between the two layers of glass to ensure the light transmittance of the skylight 7 and the structural strength of the skylight 7. At the same time, a clamping ring 56 surrounding the outer wall of the skylight 7 is provided on the resin pier 5.

[0030] like Figure 1 , Figure 2 As shown, the seal 8 is arranged between the light cover 7 and the clamp ring 56, and the seal 8 includes a foam rod 81 and a structural rubber ring 82. The foam rod 81 is annularly arranged between the light cover 7 and the clamp ring 56, and the structural rubber ring 82 is arranged on the foam rod 81 and located between the light cover 7 and the clamp ring 56.

[0031] like Figure 1 , Figure 2 As shown, an inner waterproof layer 57 is provided between the outer wall and the upper end surface of the resin pier 5, and an outer waterproof layer 58 surrounding the inner waterproof layer 57 is provided on the outer wall of the resin pier 5, and the upper end of the outer waterproof layer 58 wraps the mounting ring 51 and the clamping ring 56.

[0032] Therefore, during the construction of the entire lighting system, the double cooperation of the inner waterproof layer 57 and the outer waterproof layer 58 is provided to increase the sealing and waterproof properties around the concrete pier 1 and the resin pier 5 to prevent water seepage and leakage.

[0033] like Figure 1 , Figure 3 As shown, a thermal insulation cotton layer 31 is arranged between the lower end outer wall of the light guide tube 3 and the embedded steel sleeve 2, and a sealing cover 32 surrounding the thermal insulation cotton layer 31 is arranged between the lower end outer wall of the light guide tube 3 and the inner wall of the indoor side wall to increase the sealing and waterproof properties of the lower end of the light guide tube 3. At the same time, the thermal insulation cotton layer 31 also provides a certain thermal insulation effect to prevent heat loss in winter.

[0034] like Figure 1 , Figure 3As shown, a sealing rubber ring 33 is provided between the diffuser 4 and the end surface of the light guide 3 to achieve a preliminary connection and a relatively sealed connection between the diffuser 4 and the light guide 3. A decorative collar 34 is provided on the outer wall of the light guide 3, the end of the decorative collar 34 is bent and pressed against the outer edge of the diffuser 4, a buckle 35 is provided on the inner wall of the decorative collar 34, and a buckle hole 36 is provided on the light guide 3 for the buckle 35 to be inserted.

[0035] Therefore, when installing the diffuser 4, the sealing ring 33 is used to set the bonding and fixation between the diffuser 4 and the light guide tube 3, and then the decorative ring 34 is sleeved on the outer wall of the light guide tube 3, and the buckle 35 is passed through the buckle hole 36 to achieve the installation and fixation of the decorative ring 34, and also achieve the compression and fixation of the edge position of the diffuser 4, thereby increasing the stability of the diffuser 4 when in use, and also improving the installation convenience and efficiency of the diffuser 4.

[0036] Embodiment 2: like Figure 4 , Figure 5 , Figure 6 As shown, a light pipe lighting system with adjustable light brightness is different from Example 1 in that it also includes an adjustment mechanism 9, which is used to adjust the covering area of ​​the light pipe 3 at the pipe opening position, thereby limiting the light intensity passing through the light pipe 3 and realizing the adjustment of the light brightness at the diffuser 4 position.

[0037] like Figure 5 , Figure 6 As shown, the adjustment mechanism 9 includes a fixed disk 91, an adjustment plate 92 and a rotating disk 93. The fixed disk 91 is annularly arranged at the outer edge of the light cover 7, and a regular hexagonal limiting groove 94 is arranged on the fixed disk 91, and both ends of the limiting groove 94 extend horizontally along the straight direction thereof.

[0038] like Figure 5 , Figure 6 As shown, six adjustment plates 92 are provided, and the adjustment plates 92 are arranged in a triangular shape, and the tips of the adjustment plates 92 are gathered together, and are used to completely cover the light guide tube 3 when they are attached to each other. The adjustment plate 92 is provided with a limit block 95 slidably connected to the limit groove 94, and the length direction of the limit block 95 is flush with the length direction of the bottom edge of the adjustment plate 92.

[0039] like Figure 5 , Figure 6 As shown, the rotating disk 93 is rotatably connected to the fixed disk 91 and is buckled on the adjustment plate 92. The rotating disk 93 is provided with a guide groove 96 arranged along its tangent direction, and the center position of the outer edge position of the adjustment plate 92 is provided with a guide rod 97 matched with the guide groove 96.

[0040] like Figure 5 , Figure 6As shown, the lighting cover 7 is provided with a remote control motor 98 , the remote control motor 98 is provided with a gear 981 , and the outer wall of the rotating disk 93 is provided with a gear ring 931 meshing with the gear 981 .

[0041] When the brightness of the entire lighting system needs to be adjusted, the remote controller is used to remotely control the remote control motor 98 to rotate forward and reverse. At this time, the remote control motor 98 drives the gear 981 to rotate forward and reverse, and the gear 981 drives the gear ring 931 to move synchronously, and drives the rotating disk 93 to move synchronously.

[0042] When the rotating disk 93 rotates, under the cooperation of the guide groove 96 and the guide rod 97 as well as the limit groove 94 and the limit block 95, the adjustment plate 92 slides along the direction of the limit groove 94, thereby controlling the multiple adjustment plates 92 to gather together or move away from each other, thereby realizing the adjustment of the shielding area of ​​the tube mouth position of the light guide tube 3.

[0043] Therefore, when the shielding area at the opening of the light guide 3 is adjusted, the intensity of light passing through the light guide 3 can be effectively limited, the brightness of light at the diffuser 4 can be adjusted, and free switching between fully open, partially open and fully closed states can be achieved to meet different lighting needs and improve the practicality of the lighting system.

[0044] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A light guide lighting system capable of adjusting light brightness, characterized in that: include: A concrete pier (1) is bent in an L shape and arranged inside the main body of the building, and the lower end of the concrete pier (1) is connected to the outer wall of the indoor side wall; The embedded steel sleeve (2) is arranged in the concrete pier (1), and the lower end of the embedded steel sleeve extends to the inner wall of the indoor side wall; A light guide tube (3) is arranged in the embedded steel sleeve (2), and both ends of the light guide tube extend to the outside of the embedded steel sleeve (2); A diffuser (4) is arranged at the lower end of the light guide tube (3); A light cover (7) is arranged to cover the upper end of the light guide tube (3), and the lower end surface of the light cover (7) abuts against the upper end surface of the light guide tube (3); An adjustment mechanism (9) for adjusting the covering area of ​​the light guide tube (3) at the tube opening; The adjustment mechanism (9) comprises a fixed disk (91), an adjustment plate (92) and a rotating disk (93); the fixed disk (91) is arranged in a circular ring shape at the outer edge of the light cover (7); the fixed disk (91) is provided with a regular hexagonal limiting groove (94); the two ends of the limiting groove (94) extend horizontally along the straight direction thereof; six adjustment plates (92) are provided and arranged in a triangular shape; the tips of the adjustment plates (92) are gathered together and are used to cover the light guide tube (3); the adjustment plates A limit block (95) is provided on the adjusting plate (92) and is slidably connected to the limit groove (94). The length direction of the limit block (95) is flush with the length direction of the bottom edge of the adjusting plate (92). The rotating disk (93) is rotatably connected to the fixed disk (91) and is buckled on the adjusting plate (92). The rotating disk (93) is provided with a guide groove (96) arranged along its tangential direction. A guide rod (97) matching the guide groove (96) is provided at the center position of the outer edge of the adjusting plate (92).

2. The light guide lighting system with adjustable light intensity according to claim 1, characterized in that: The light cover (7) is provided with a remote control motor (98), the remote control motor (98) is provided with a gear (981), and the outer wall of the rotating disk (93) is provided with a gear ring (931) meshing with the gear (981).

3. The light guide lighting system with adjustable light intensity according to claim 1, characterized in that: Also includes: A resin pier (5) is arranged in an annular shape on the upper end surface of the concrete pier (1); a mounting ring (51) is arranged on the outer wall of the lower end of the resin pier (5); an anchor bolt (52) is arranged between the mounting ring (51) and the concrete pier (1); and a clamping ring (56) surrounding the outer wall of the skylight (7) is arranged on the resin pier (5); A fixing member (6) is arranged at the upper end of the light guide tube (3) and connected to the inner wall of the resin pedestal (5); A sealing member (8) is arranged between the light cover (7) and the clamping ring (56).

4. The light guide lighting system capable of adjusting light brightness according to claim 3, characterized in that: The fixing member (6) comprises a fixing tube (61), a fixing ring (62), a hook (63) and a locking ring (64); the fixing tube (61) is sleeved on the outer wall of the upper end of the light guide tube (3); the fixing ring (62) is arranged on the outer wall of the fixing tube (61); the inner wall of the resin pedestal (5) is provided with a supporting seat (54) for supporting the fixing ring (62); the hook (63) is arranged at the outer edge of the fixing ring (62); the supporting seat (54) is provided with a slot (55) for the hook (63) to be hooked; the locking ring (64) is arranged on the inner wall of the fixing tube (61); and the light guide tube (3) is provided with a locking hole (65) for the locking ring (64) to be embedded.

5. The light guide lighting system capable of adjusting light brightness according to claim 4, characterized in that: An aluminum foil tape (66) is wound between the lower end of the fixing tube (61) and the outer wall of the light guide tube (3), and a rubber ring (67) is provided on the outer wall of the upper end of the fixing tube (61) to abut against the lower end surface of the light cover (7).

6. The light guide lighting system capable of adjusting light brightness according to claim 3, characterized in that: The sealing member (8) comprises a foam rod (81) and a structural rubber ring (82); the foam rod (81) is arranged in a ring shape between the light cover (7) and the clamping ring (56); the structural rubber ring (82) is arranged on the foam rod (81) and is located between the light cover (7) and the clamping ring (56).

7. The light guide lighting system capable of adjusting light brightness according to claim 3, characterized in that: The lower end surface of the resin pier (5) is embedded with a sealing ring (53) that abuts against the upper end surface of the concrete pier (1).

8. The light guide lighting system capable of adjusting light brightness according to claim 3, characterized in that: An inner waterproof layer (57) is provided between the outer wall and the upper end surface of the resin pier (5), and an outer waterproof layer (58) surrounding the inner waterproof layer (57) is provided on the outer wall of the resin pier (5), and the upper end of the outer waterproof layer (58) wraps around the mounting ring (51) and the clamping ring (56).

9. The light guide lighting system capable of adjusting light brightness according to claim 3, characterized in that: A heat-insulating cotton layer (31) is provided between the lower outer wall of the light guide tube (3) and the embedded steel sleeve (2), and a sealing cover (32) surrounding the heat-insulating cotton layer (31) is provided between the lower outer wall of the light guide tube (3) and the inner wall of the indoor side wall.

10. The light guide lighting system capable of adjusting light brightness according to claim 9, characterized in that: A sealing rubber ring (33) is provided between the diffuser (4) and the end surface of the light guide (3); a decorative ring (34) is sleeved on the outer wall of the light guide (3); the end of the decorative ring (34) is bent and pressed against the outer edge of the diffuser (4); a buckle (35) is provided on the inner wall of the decorative ring (34); and a buckle hole (36) for the buckle (35) to be embedded is provided on the light guide (3).

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