Thin down lamp

Abstract

The utility model discloses a thin down lamp which comprises a cover shell, a light guide plate is arranged in the cover shell, a light guide plate side face is formed on the light guide plate, LED lamp beads used for emitting light rays to the light guide plate side face are arranged in the cover shell, the LED lamp beads are distributed on the outer side of the light guide plate in the circumferential direction, and reflector plates are arranged on the light guide plate side face in the circumferential direction at intervals. A light inlet window is formed between every two adjacent reflector plates, the positions of the LED lamp beads correspond to the light inlet windows, a reflecting layer is arranged on the light guide plate, and a frosted face is arranged on the lower face of the light guide plate. The down lamp can reduce light loss.

Description

Technical Field

[0001] This utility model relates to the field of downlights, specifically to a thin downlight. Background Technology

[0002] Currently, there are thin downlights on the market. Compared to traditional downlights, thin downlights have a smaller height. Therefore, a ring-shaped LED light strip is set around the outer perimeter of the light guide plate. The LED beads on the LED light strip illuminate the side of the light guide plate, and then the light undergoes complex reflections within the light guide plate. Since reflective paper is attached to the top of the light guide plate, most of the light entering the light guide plate is ultimately reflected downwards (and then refracted out), so that the downlight can illuminate objects below. For example, refer to the "An Ultra-thin LED Downlight" with Chinese Utility Model Patent Publication No. CN206222123U. However, since the LED light strip is set around the outer perimeter of the light guide plate, that is, the LED beads emit light roughly (radially) towards the center of the light guide plate. Therefore, part of the light entering the light guide plate can be refracted through the other side of the light guide plate and then partially absorbed by the LED light strip, resulting in greater light loss. It is necessary to improve this design. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a thin downlight that can reduce light loss.

[0004] The objective of this utility model is achieved through the following technical solution.

[0005] The thin downlight disclosed in this utility model includes a cover shell, a light guide plate is provided inside the cover shell, the light guide plate has a side surface, and LED beads for emitting light to the side surface of the light guide plate are provided inside the cover shell. The LED beads are circumferentially distributed on the outer side of the light guide plate. Reflective sheets are circumferentially spaced on the side surface of the light guide plate, and light entrance windows are formed between adjacent reflective sheets. The LED beads are positioned corresponding to the light entrance windows. A reflective layer is provided on the top of the light guide plate, and a frosted surface is provided on the bottom of the light guide plate.

[0006] Preferably, the reflective layer is a silver-plated reflective layer.

[0007] Preferably, the reflective sheet is bonded to the side of the light guide plate.

[0008] Preferably, the lower side of the cover shell is provided with a flange, the flange having an inner edge portion, the lower side of the light guide plate is provided with a light-diffusing plate, the cover shell is provided with a heat-conducting spring cover, the center of the heat-conducting spring cover has a recessed portion, the heat-conducting spring cover has a spring cover perimeter, the inner side of the spring cover perimeter is abutted with a light strip, the LED beads are disposed on the inner side of the light strip, the recessed portion is abutted with the upper side of the reflective layer, the edge portion of the light-diffusing plate is abutted with the inner edge portion of the flange, the cover shell includes a cover shell top plate, and the outer periphery of the heat-conducting spring cover is abutted with the lower side of the cover shell top plate.

[0009] Preferably, the flange has an upper convex ring plate with a snap groove, the cover has a cover perimeter, the inner side of the cover perimeter has a slot and an inner snap, the upper convex ring plate is inserted into the slot, and the inner snap is connected to the corresponding snap groove.

[0010] Compared with the prior art, the advantages of this utility model are as follows: by setting LED beads to be circumferentially distributed on the outside of the light guide plate, and setting reflective sheets circumferentially spaced on the side of the light guide plate, forming a light entrance window between adjacent reflective sheets, with the LED beads positioned corresponding to the light entrance window, and setting a reflective layer on the top of the light guide plate and a frosted surface on the bottom of the light guide plate, the downlight of this utility model can reduce light loss. Attached Figure Description

[0011] Figure 1 This is a top-view three-dimensional structural diagram of the thin downlight of this utility model.

[0012] Figure 2 This is a cross-sectional structural diagram of the thin downlight of this utility model.

[0013] Figure 3 for Figure 2 A partial structural diagram at point A.

[0014] Figure 4 This is a partial structural diagram of the LED lamp bead and light guide plate combination of this utility model.

[0015] Figure 5 This is a three-dimensional structural diagram of the light guide plate of this utility model.

[0016] Figure 6 This is a bottom-view perspective view of the cover shell of this utility model.

[0017] Figure 7 This is a top-view three-dimensional structural diagram of the flange of this utility model.

[0018] Figure 8 This is a bottom-view three-dimensional structural diagram of the heat-conducting elastic cover of this utility model.

[0019] Figure 9 This is a top view of the LED lamp bead and light guide plate combination of this utility model.

[0020] Labeling: Cover 1; Cover top plate 11; Cover edge 12; Positioning piece 121; Slot 1201; Inner protrusion buckle 1202; Flange 2; Inner edge of flange 201; Upper protruding ring piece 21; Buckle groove 211; Heat-conducting spring cover 3; Lower recess 31; Spring cover edge 32; Wiring hole 301; LED bead 4; Light strip 40; Light guide plate 5; Reflective layer 51; Side of light guide plate 501; Light entrance window 5011; Reflective sheet 5012; Light-diffusing plate 6; Wire 99. Detailed Implementation

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] The thin downlight of this utility model, such as Figures 1 to 3 As shown, it includes a cover shell 1, inside which is a light guide plate 5. The light guide plate 5 can be made of glass or acrylic. From a top-down view, the light guide plate 5 is circular, as shown... Figure 4 As shown, the light guide plate 5 has a light guide plate side surface 501, and thus the light guide plate side surface 501 is a cylindrical surface, as shown in the figure. Figure 3 and Figure 4 As shown, the cover 1 contains LED beads 4 for emitting light from the side 501 of the light guide plate. That is, the LED beads 4 are positioned facing the side 501 of the light guide plate, and are circumferentially distributed on the outer side of the light guide plate 5. Figure 5 As shown, reflective sheets 5012 are circumferentially spaced on the side 501 of the light guide plate, meaning that the reflective sheets 5012 are curved. Light entrance windows 5011 are formed between adjacent reflective sheets 5012. Figure 9 As shown, the position of LED bead 4 corresponds to the light-incident window 5011. That is to say, in the circumferential direction of the light guide plate 5, the LED bead 4 is arranged at the corresponding position on the side 501 of the light guide plate that is not blocked by the reflector 5012. Figure 4 As shown, the light guide plate 5 has a reflective layer 51 on its upper surface and a frosted surface on its lower surface. The lower surface of the light guide plate 5 is the light-emitting surface, and the frosted surface of the lower surface of the light guide plate 5 can be formed by a polishing process.

[0023] like Figure 4As shown, when the LED bead 4 is working, it emits light into the light-incident window 5011. The light then passes through the side 501 of the light guide plate and enters the light guide plate 5. The upward-biased light is reflected downwards by the reflective layer 51. When the downward-biased light reaches the bottom of the light guide plate 5, it undergoes diffuse reflection and refraction, resulting in complex reflections within the light guide plate 5. Some light rays with larger incident angles undergo total internal reflection at the bottom of the light guide plate 5. However, due to the diverging effect of the bottom of the light guide plate 5, the downward-biased light reflected by the reflective layer 51 is less likely to concentrate and undergo total internal reflection at the bottom of the light guide plate 5. This makes it easier for the light to refract out from the bottom of the light guide plate 5, and the uniformity of the light emitted from the bottom of the light guide plate 5 is better. Figure 9 As shown, since reflective sheets 5012 are circumferentially spaced on the side 501 of the light guide plate, a portion of the light emitted by the LED bead 4, perpendicular to the central axis of the light guide plate 5, passes through the light guide plate 5 and reaches the other side of the light guide plate 5. The reflective sheet 5012 on the other side of the light guide plate 5 then reflects the light, reducing the light refracted from the side 501 of the light guide plate. Since there is a perpendicularity error between the reflective sheet 5012 and the bottom of the light guide plate 5, the light reflected multiple times by the reflective sheet 5012 can still be deflected to the bottom of the light guide plate 5 (or reflected downwards by the reflective layer 51), which helps to relatively increase the downward illumination intensity of the downlight. That is to say, the downlight of this utility model can reduce light loss.

[0024] Furthermore, the reflective layer 51 is set as a silver-plated reflective layer. That is to say, the light guide plate 5 is made of glass, and a silver-plated layer is formed on the top of the light guide plate 5. In other words, the reflective layer 51 and the light guide plate 5 are set as an integral part. For example, you can refer to the "A method for silver plating a glass mirror" with Chinese invention patent announcement number CN101955322B. Thus, the reflective layer 51 has better light reflection performance. In contrast, the existing technology of setting reflective paper on the upper side of the light guide plate will increase the installation complexity.

[0025] Furthermore, the reflector 5012 is bonded to the side 501 of the light guide plate. Specifically, the reflector 5012 can be made of an aluminized composite film. For example, refer to the Chinese Utility Model Patent Publication No. CN209129273U, "An Aluminized PET Composite Film". The aluminized composite film can be wrapped around the light guide plate 5 first. The aluminized composite film can be bonded to the side 501 of the light guide plate with adhesive. Then, the aluminized composite film can be cut off in sections to form the light entrance window 5011.

[0026] Furthermore, such as Figures 1 to 3 As shown, a flange 2 is provided on the lower side of the cover 1, such as... Figure 7 As shown, flange 2 has an inner edge portion 201, as Figure 2 and Figure 3As shown, a light-diffusing plate 6 is provided on the lower side of the light guide plate 5, and a heat-conducting elastic cover 3 is provided inside the cover shell 1, as shown. Figure 8 As shown, a recessed portion 31 is formed in the middle of the heat-conducting cover 3, and a cover edge 32 is formed on the heat-conducting cover 3. The cover edge 32 is bent downward relative to the body of the heat-conducting cover 3. Figure 3 As shown, a light strip 40 is attached to the inner side of the spring cover edging 32. The light strip 40 is a flexible light strip. For example, refer to Chinese Utility Model Patent Publication No. CN222849166U "A Flexible Circuit Board for LED Lamps". LED beads 4 are disposed on the inner side of the light strip 40. The light strip 40 can be adhered to the inner side of the spring cover edging 32. The recessed portion 31 is attached to the upper side of the reflective layer 51. The edge of the light-diffusing plate 6 is attached to the inner edge portion 201 of the flange. Figure 6 As shown, the cover 1 includes a cover top plate 11, as... Figure 2 and Figure 3 As shown, the outer periphery of the heat-conducting cover 3 is attached to the lower side of the top plate 11 of the cover shell. That is to say, there is a gap between the center of the top plate 11 of the cover shell and the heat-conducting cover 3. The aforementioned "outer periphery of the heat-conducting cover 3" specifically refers to the part of the heat-conducting cover 3 located outside the recess 31. Thus, the cover edge 32 is located below the top plate 11 of the cover shell. The body of the heat-conducting cover 3 undergoes a small-amplitude elastic flattening deformation. And because the edge of the uniform plate 6 is attached to the inner edge 201 of the flange, the outer periphery of the heat-conducting cover 3... The elastic restoring force of the heat-conducting cover 3 presses against the top plate 11 of the cover shell, ensuring good contact between the outer periphery of the heat-conducting cover 3 and the top plate 11. Thus, the heat generated by the LED beads 4 during operation can be partially transferred to the light strip 40, and the heat from the light strip 40 can be transferred to the heat-conducting cover 3, and then to the cover shell 1. The cover shell 1 dissipates heat to the outside. The heat from the air inside the heat-conducting cover 3 can also be transferred to the heat-conducting cover 3, and then dissipated to the outside through the cover shell 1. The heat-conducting cover 3 can be made of copper. Figure 8 As shown, a wire hole 301 is formed on the heat-conducting cover 3, such as Figure 2 As shown, wire 99 can be connected to light strip 40 through wire hole 301. Light doubling plate 6 can be made of polycarbonate. Light doubling plate 6 is white light doubling plate. Light doubling plate 6 can play a light doubling effect on the light refracted from below light guide plate 5.

[0027] Furthermore, such as Figure 7 As shown, an upper convex ring 21 is formed on the flange 2, and a snap groove 211 is formed on the upper convex ring 21, as... Figure 6As shown, the cover 1 has a cover perimeter 12, the upper end of which is integrally connected to the outer peripheral edge of the cover top plate 11. A slot 1201 and an inner protrusion 1202 are formed on the inner side of the cover perimeter 12. The slot 1201 and the inner protrusion 1202 are arranged alternately in a circumferential direction. Specifically, a positioning piece 121 is formed inside the cover 1, and the upper end of the positioning piece 121 is integrally connected to the lower side of the cover top plate 11. Figure 3 As shown, the upper convex ring 21 is inserted into the slot 1201, and the inner convex buckle 1202 is connected to the corresponding buckle groove 211. Thus, the inner convex buckle 1202 prevents the flange 2 from moving downward relative to the cover shell 1, so that the flange 2 can support the downward thrust of the recessed part 31 on the light guide plate 5.

Claims

1. A thin downlight, comprising a cover (1), wherein a light guide plate (5) is disposed inside the cover (1), the light guide plate (5) having a light guide plate side surface (501), and an LED bead (4) for emitting light toward the light guide plate side surface (501) is disposed inside the cover (1), characterized in that: The LED beads (4) are circumferentially distributed on the outside of the light guide plate (5). Reflective sheets (5012) are circumferentially spaced on the side (501) of the light guide plate. A light entrance window (5011) is formed between adjacent reflective sheets (5012). The LED beads (4) are positioned corresponding to the light entrance window (5011). A reflective layer (51) is provided on the top of the light guide plate (5), and a frosted surface is provided on the bottom of the light guide plate (5).

2. The thin downlight according to claim 1, characterized in that: The reflective layer (51) is a silver-plated reflective layer.

3. The thin downlight according to claim 1, characterized in that: The reflective sheet (5012) is bonded to the side of the light guide plate (501).

4. The thin downlight according to claim 1, characterized in that: The cover (1) has a flange (2) on its lower side, the flange (2) has an inner edge (201), the light guide plate (5) has a light-diffusing plate (6) on its lower side, the cover (1) has a heat-conducting spring cover (3), the heat-conducting spring cover (3) has a recess (31) in its middle part, the heat-conducting spring cover (3) has a spring cover rim (32), the inner side of the spring cover rim (32) is attached to a light strip (40), the LED beads (4) are disposed on the inner side of the light strip (40), the recess (31) is attached to the upper side of the reflective layer (51), the edge of the light-diffusing plate (6) is attached to the inner edge (201) of the flange, the cover (1) includes a cover top plate (11), and the outer periphery of the heat-conducting spring cover (3) is attached to the lower side of the cover top plate (11).

5. The thin downlight according to claim 4, characterized in that: An upper convex ring (21) is formed on the flange (2), and a snap groove (211) is formed on the upper convex ring (21). The cover (1) has a cover perimeter (12). A slot (1201) and an inner convex buckle (1202) are formed on the inner side of the cover perimeter (12). The upper convex ring (21) is inserted into the slot (1201), and the inner convex buckle (1202) is connected to the corresponding snap groove (211).

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