Light-emitting device

Abstract

To provide a light emitting device that requires a small number of fixing materials of a power supply board, and can reduce weight.SOLUTION: A light emitting device includes a case, a heat sink, a light source module board, and a power supply board. The light source module board is attached to the heat sink, and the heat sink is attached to the case. The heat sink includes a platy flat base. The flat base is provided with a plurality of claw portions projecting out to the flat base. The plurality of claw portions clips the power supply board to fix the power supply board to the heat sink so as to be perpendicular to the flat base. The power supply board is electrically connected to the light source module board.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to the field of lighting, and more particularly to light emitting devices. [Background technology]

[0002] Light-emitting devices that use light-emitting diodes (LEDs) as light sources and mainly include a light source module board, a heat sink, a power supply board, and a case are well known. In conventional light-emitting devices, the power supply board is usually fixedly mounted inside the case, and the light source module board is mounted on a heat sink. The heat sink is mounted on the case, and the light source module board and the power supply board are electrically connected to an integrated circuit socket via pins (PIN needles).

[0003] However, in the light bulb described in Patent Document 1, for example, the mechanical fixation of the power board relies on a fixing device inside the case, such as a non-metallic plastic part integrated with the case, which increases the weight of the lighting device. The power board does not contact the heat sink, and heat dissipation from the power board relies on a fixing device inside the case, resulting in poor heat dissipation. Furthermore, the positioning of the pins and integrated circuit socket is indirectly achieved by the positioning of the heat sink and the lamp base, making assembly of the light-emitting device inconvenient. Processing and assembly errors can easily cause stress in the pins and integrated circuit socket, which affects the reliability of the light-emitting device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 8,421,321 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present disclosure is to provide a light emitting device that requires less fixing material for the power supply board and can reduce its weight. [Means for solving the problem]

[0006] To achieve the above object, the present disclosure employs the following technical means.

[0007] The light emitting device of the present disclosure includes a case, a heat sink, a light source module board, and a power supply board, the light source module board is attached to the heat sink, the heat sink is attached to the case, and the heat sink includes a plate-shaped platform, the platform has a plurality of claw portions that protrude from the platform, and the plurality of claw portions clamp the power supply board, thereby fixing the power supply board to the heat sink so that it is perpendicular to the platform, and the power supply board is electrically connected to the light source module board.

[0008] In one alternative embodiment, the direction of the clamping force with which the plurality of claws clamp the power supply board may be perpendicular to the power supply board.

[0009] In one alternative embodiment, each claw portion is an elastic piece, which is formed integrally with the platform, and which includes a root portion connected to the platform and a free end portion away from the platform, the root portion extending in a direction perpendicular to the platform, and the free end portion extending in a direction away from the platform and also in a direction away from the power board.

[0010] In one alternative embodiment, each claw portion may be a rigid piece, an accommodating space may be formed between the rigid pieces, and a portion of the power supply board may be inserted into the accommodating space so as to be clamped and fixed by the rigid pieces.

[0011] In one alternative embodiment, the edges of the power board may abut against the platform.

[0012] In one alternative embodiment, the plurality of claws may be arranged in two rows, with the claws in one row offset from the claws in the other row, or the claws in one row aligned with the claws in the other row.

[0013] In an alternative embodiment, the number of the plurality of claws may be two to four.

[0014] In an alternative embodiment, the plurality of prongs may be made of metal.

[0015] In an alternative embodiment, the case may include a receiving cavity in which the power board is received.

[0016] In one optional embodiment, the light source module board may be mounted on the side of the platform away from the case so as to be parallel to the platform, and the platform may have a through hole, and the power supply board and the light source module board may be electrically connected via the through hole. [Effects of the Invention]

[0017] The lighting device according to the present disclosure requires less fixing material for the power board, and can be reduced in weight. [Brief explanation of the drawings]

[0018] [Figure 1] 1 shows a perspective view of a light emitting device according to an embodiment of the present disclosure. [Figure 2] 2 shows a perspective view of a heat sink of the light emitting device of FIG. 1. [Figure 3] 2 shows a perspective view of a light source module board of the light emitting device of FIG. 1. [Figure 4] 2 shows an assembly diagram of a heat sink and a light source module board of the light emitting device of FIG. 1. [Figure 5] 2 shows a cross-sectional view of a heat sink of the light emitting device of FIG. [Figure 6] 2 shows a perspective view of a power supply board of the light emitting device of FIG. 1. [Figure 7]2 shows an assembly diagram of a heat sink and a power supply board of the light emitting device of FIG. 1. [Figure 8] 2 shows an assembly diagram of a heat sink, a light source module board, and a power supply board of the light emitting device of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. It should be understood that these specific descriptions are merely intended to teach those skilled in the art how to implement the present invention, and do not encompass all possible embodiments of the present invention, nor do they limit the scope of the present invention.

[0020] Note that the terms "upper," "lower," "left," "right," "front," and "rear" used in this disclosure do not limit the usage state of the light-emitting device of the present disclosure, but are merely used to easily explain the structure of the light-emitting device of the present disclosure. The front-to-rear direction is perpendicular to the power board, the up-to-down direction is perpendicular to the flat platform, and the left-to-right direction is perpendicular to the front-to-rear and up-to-down directions. The "claw portion" used in this disclosure refers to a structure that can secure the power board to the platform, and may be, but is not limited to, the first elastic piece and the third elastic piece referred to in the embodiments of the present disclosure.

[0021] 1 to 8 show the structure of a light emitting device according to an embodiment of the present disclosure.

[0022] 1 shows a light emitting device according to one embodiment of the present disclosure. The light emitting device includes a heat sink 1, a light source module board 2, a power supply board 3 (see FIGS. 6, 7, and 8), a globe 4, a case 5, and a base 6. The heat sink 1 is attached inside the case 5, and the light source module board 2 is attached to the heat sink 1.

[0023] Figure 2 shows the heat sink 1 of the light emitting device of Figure 1. The heat sink 1 is made of metal and is formed in a cylindrical shape with one end closed by a top and side walls, and the top is closed to form a disk-shaped platform 11. The diameter of the top of the heat sink 1 is larger than the diameter of its bottom, so the heat sink 1 has a trumpet-like shape. The platform 11 is provided with a first rectangular through-hole 12, a second rectangular through-hole 13, and a third rectangular through-hole 14.

[0024] The first through hole 12 is provided in the center of the platform 11, and two square second through holes 13 are provided in front and behind the first through hole 12. Two third through holes 14 are provided between the first through hole 12 and the rear second through hole 13, and the two third through holes 14 are located on both the left and right sides of the first through hole 12, respectively.

[0025] Two second elastic pieces 131 with a Z-shaped cross section are provided at the rear edge portions of the two second through holes 13, respectively. The second elastic pieces 131 may be formed by pressing the platform 11. The second elastic pieces 131 include a third arm portion 1311, a fourth arm portion 1312, and a fifth arm portion 1313. The third arm portion 1311 is located on the plane on which the platform 11 is located and extends in the front-to-rear direction. The base portion of the second elastic piece 131, which is the rear end of the third arm portion 1311, is connected to the rear edge portion of the second through hole 13, and the front end of the third arm portion 1311 is located inside the second through hole 13. The fourth arm portion 1312 extends in the up-down direction. The lower end of the fourth arm 1312 is connected to the front end of the third arm 1311, and the upper end of the fourth arm 1312 is located above the top surface of the platform 11. The fifth arm 1313 extends in the front-to-rear direction. The rear end of the fifth arm 1313 is connected to the upper end of the fourth arm 1312, and the free end of the second elastic piece 131, which is the front end of the fifth arm 1313, extends forward and upward. Because the second elastic piece 131 has elasticity, the free ends of the second elastic piece 131 can be further separated from each other relative to the platform 11.

[0026] Fig. 3 shows the light source module board 2 of the light emitting device of Fig. 1. The light source module board 2 is shaped like a rectangular plate, and ten light emitting diodes 21 are provided on its upper surface as light sources, and the ten light emitting diodes 21 are arranged in a ring shape. An integrated circuit socket 22 corresponding to the first through hole 12 is provided in the center of the light source module board 2. A fourth through hole 23 and a notch 24 corresponding to the second elastic piece 131 are provided on the front and rear sides of the integrated circuit socket 22, respectively.

[0027] FIG. 4 shows an assembly diagram of the heat sink 1 and light source module board 2 of the light-emitting device of FIG. 1 . During assembly, the lower surface of the light source module board 2 is abutted against the upper surface of the platform 11, causing the two second elastic pieces 131 to pass through the fourth through-hole 23 and the notch 24, respectively. The two second elastic pieces 131 are elastically deformed, and the light source module board 2 is moved rearward so that the free ends of the two second elastic pieces 131 are further separated from each other relative to the platform 11. When the light source module board 2 is completely attached, the lower surface of the fifth arm 1313 abuts against the upper surface of the light source module board 2, and the front side of the fourth arm 1312 abuts against the inner side of the fourth through-hole 23 and the notch 24. The second elastic pieces 131 clamp the light source module board 2 by their elastic force, so that the light source module board 2 is fixed to the platform 11. The integrated circuit socket 22 is aligned with the first through-hole 12.

[0028] FIG. 5 shows a cross-sectional view of the heat sink 1 of the light-emitting device of FIG. 1. Two first elastic pieces 121 formed by pressing are provided at the rear edge of the first through-hole 12. The two first elastic pieces 121 are provided at both left and right ends of the rear edge of the first through-hole 12 so that the two first elastic pieces 121 are arranged symmetrically with respect to a center line extending in the front-rear direction of the platform 11. The first elastic pieces 121 include a first arm portion 1211 and a second arm portion 1212. The first arm portion 1211 extends in the vertical direction, and the base portion of the first elastic piece 121, which is its upper end, is connected to the rear edge of the first through-hole 12. The upper end of the second arm portion 1212 is connected to the lower end of the first arm portion 1211. Since the second arm portion 1212 extends downward and forward, the second arm portion 1212 and the first arm portion 1211 form a certain angle.

[0029] Two third elastic pieces 141 are provided on the front edges of the two third through-holes 14 so that the two third elastic pieces 141 are arranged symmetrically with respect to a center line extending in the front-rear direction of the platform 11. The third elastic pieces 141 are formed by pressing the platform 11. The third elastic piece 141 includes a sixth arm portion 1411 and a seventh arm portion 1412. The sixth arm portion 1411 extends in the vertical direction, and the base portion of the third elastic piece 141, which is its upper end, is connected to the front edge of the third through-hole 14. The upper end of the seventh arm portion 1412 is connected to the lower end of the sixth arm portion 1411. Because the seventh arm portion 1412 extends downward and rearward, the seventh arm portion 1412 and the sixth arm portion 1411 form a certain angle.

[0030] The first elastic pieces 121 and the third elastic pieces 141 are for clamping the power supply board 3, and the first elastic pieces 121 are formed in one row, and the third elastic pieces 141 are formed in another row. When viewed in the front-rear direction, the first elastic pieces 121 and the third elastic pieces 141 are offset from each other. When viewed in the left-right direction, the first elastic pieces 121 and the third elastic pieces 141 are offset from each other, so that an accommodation space into which the power supply board 3 is inserted is formed between the first elastic pieces 121 and the third elastic pieces 141. The first elastic pieces 121 and the third elastic pieces 141 are elastically deformable in the front-rear direction so that the free ends of the first elastic pieces 121 and the third elastic pieces 141 are further separated from each other.

[0031] In this embodiment, the first elastic piece 121, the second elastic piece 131, and the third elastic piece 141 are formed by pressing the platform 11, which simplifies the processing and effectively reduces the manufacturing costs of the light emitting device. In addition, the free ends and bases of the first elastic piece 121, the second elastic piece 131, and the third elastic piece 141 form a certain angle, which serves to guide the installation of the light source module board 2 and the power supply board 3, thereby reducing the difficulty of assembling the light source module board 2 and the power supply board 3.

[0032] Fig. 6 shows the power supply board 3 of the light emitting device of Fig. 1. The power supply board 3 is provided with pins 31 (pin needles), which extend upward in a direction parallel to the power supply board 3 and protrude outside the power supply board 3.

[0033] FIG. 7 shows an assembly diagram of the heat sink 1 and power board 3 of the light emitting device of FIG. 1. The power board 3 is vertical in the front-to-back direction. The power board 3 enters the housing space from below the heat sink 1, with the first elastic piece 121 clamping the front side of the power board 3 and the third elastic piece 141 clamping the rear side of the power board 3. The first elastic piece 121 and the third elastic piece 141 elastically deform to clamp the power board 3. When the power board 3 is installed, it is perpendicular to the platform 11, the upper edge of the power board 3 abuts against the lower surface of the platform 11, and the pin 31 passes through the first through-hole 12 and protrudes toward the upper surface of the platform 11. In consideration of safe insulation, when the upper edge of the power board 3 abuts against the platform 11, no wiring is provided on the upper edge of the power board 3 or in the area close to the upper edge, and the wiring of the power board 3 maintains an appropriate insulating distance from the platform 11 and the claw portion.

[0034] The power board 3 is fixedly connected to the heat sink 1 via the first elastic piece 121 and the third elastic piece 141, thereby saving the fixing material of the power board 3 and reducing the weight of the light emitting device. The heat sink 1 can transfer the heat of the power board 3, improving the heat dissipation efficiency of the light emitting device and further extending the life of the light emitting device. The wiring of the power board 3 maintains an appropriate insulating distance from the platform 11 and the claws, making the light emitting device safe and reliable.

[0035] 8 shows an assembly diagram of the heat sink 1, light source module board 2, and power supply board 3 of the light emitting device of FIG. 1. During assembly, the light source module board 2 is first attached to the upper surface of the platform 11. After the attachment of the light source module board 2 is completed, the power supply board 3 is attached to the lower surface of the platform 11. When attaching the power supply board 3, the pins 31 are aligned with the integrated circuit socket 22 and inserted into and connected to the integrated circuit socket 22, thereby achieving an electrical connection between the power supply board 3 and the light source module board 2. After the attachment of the power supply board 3 is completed, the pins 31 pass through the integrated circuit socket 22 and protrude above the integrated circuit socket 22.

[0036] Since both the power supply board 3 and the light source module board 2 are attached to the heat sink 1, the positioning error between the power supply board 3 and the light source module board 2 is reduced, facilitating the assembly of the light emitting device. When the power supply board 3 and the light source module board 2 are connected by the integrated circuit socket 22 and the pins 31, the stress between the integrated circuit socket 22 and the pins 31 is effectively reduced, improving the reliability of the light emitting device.

[0037] The present disclosure has at least one of the following advantages.

[0038] (i) The power board 3 is fixedly connected to the heat sink 1 via the first elastic piece 121 and the third elastic piece 141, thereby saving the fixing material of the power board 3 and reducing the weight of the light emitting device. The heat sink 1 can transfer the heat of the power board 3, improving the heat dissipation efficiency of the light emitting device and further extending the life of the light emitting device. The wiring of the power board 3 maintains an appropriate insulating distance from the platform 11 and the claws, making the light emitting device safe and reliable.

[0039] (ii) Since both the power supply board 3 and the light source module board 2 are attached to the heat sink 1, the positioning error between the power supply board 3 and the light source module board 2 is reduced, facilitating the assembly of the light emitting device. When the power supply board 3 and the light source module board 2 are connected by the integrated circuit socket 22 and the pin 31, the stress between the integrated circuit socket 22 and the pin 31 is effectively reduced, improving the reliability of the light emitting device.

[0040] (iii) The first elastic piece 121, the second elastic piece 131, and the third elastic piece 141 are formed by pressing the platform 11, which simplifies the processing process and effectively reduces the manufacturing costs of the light emitting device. In addition, the free ends and bases of the first elastic piece 121, the second elastic piece 131, and the third elastic piece 141 form a certain angle, which functions to guide the installation of the light source module board 2 and the power supply board 3, thereby reducing the difficulty of assembling the light source module board 2 and the power supply board 3.

[0041] It should be understood that the above-described embodiments are merely illustrative and are not intended to limit the present invention, and those skilled in the art may make various modifications and variations to the above-described embodiments from the teachings of the present disclosure without departing from the scope of the present invention.

[0042] The claws are not limited to the first elastic piece 121 or the third elastic piece 141, but may have a structure such as a locking claw or snap, or may have a simple protruding structure. The claws are not limited to clamping the power board 3 by the elastic force generated by their own elastic deformation, but may fix the power board 3 by interference fitting, structural locking, bolting, screwing, adhesive, or the like. For example, the claws may be rigid pieces, with a storage space formed between the rigid pieces, and a portion of the power board 3 is inserted into the storage space so as to be clamped and fixed by the rigid pieces. Specifically, the storage space between the rigid pieces may be formed in an expanding or converging shape, and the power board 3 is formed in a shape corresponding to the storage space. The claws are not limited to clamping the power board 3 in a direction perpendicular to the power board 3, but may also clamp the power board 3 in a direction parallel to the power board 3 or any other direction. The claws are not limited to being formed integrally with the platform 11, but may be connected to the platform 11 by engagement, adhesive, bolting, screwing, or the like. The first arm portion 1211 and the sixth arm portion 1411 are not limited to extending in the vertical direction; the first arm portion 1211 may extend downward and rearward, and the sixth arm portion 1411 may extend downward and forward. The number and arrangement of the claw portions are not limited to the number and arrangement shown in the embodiment. The lengths of the first elastic piece 121 and the third elastic piece 141 in the left-right direction are not limited; for example, the two first elastic pieces 121 may be in contact with each other or may be formed integrally.

[0043] Both the light source module board 2 and the power supply board 3 are printed circuit board assemblies (PCBA) that include not only a printed circuit board but also electronic components mounted on the printed circuit board. The light source module board 2 and the power supply board 3 are not limited to being connected using the integrated circuit socket 22 and the pins 31, but may also be electrically connected by conductive wires, flat cables, etc.

[0044] The shape of the heat sink 1 is not limited to the shapes shown in the examples, and may be any shape such as a plate shape. The heat sink 1 is not limited to being made of metal, and may be made of materials such as plastic, ceramics, graphite, etc.

[0045] The light source module board 2 is not limited to using the light emitting diodes 21 as light sources. The number and arrangement of the light emitting diodes 21 are not limited to those shown in the embodiment.

[0046] The light emitting device is not limited to being composed of the heat sink 1, the light source module board 2, the power supply board 3, the globe 4, the case 5 and the base 6, but may further include any possible components. [Explanation of symbols]

[0047] 1 heat sink, 11 platform, 12 first through hole, 121 first elastic piece, 1211 first arm portion, 1212 second arm portion, 13 second through hole, 131 second elastic piece, 1311 third arm portion, 1312 fourth arm portion, 1313 fifth arm portion, 14 third through hole, 141 third elastic piece, 1411 sixth arm portion, 1412 seventh arm portion, 2 light source module board, 21 light emitting diode (LED), 22 integrated circuit socket, 23 fourth through hole, 24 notch, 3 power supply board, 31 pin, 4 globe, 5 case, 6 base

Claims

1. A light emitting device including a case, a heat sink, a light source module board, and a power supply board, the light source module board is attached to the heat sink, the heat sink is attached to the case, and the heat sink includes a plate-shaped flat base; The platform is provided with a plurality of claws protruding from the platform, and the plurality of claws clamp the power supply board, thereby fixing the power supply board to the heat sink so as to be perpendicular to the platform, and the power supply board is electrically connected to the light source module board; Each of the claws is an elastic piece, and the elastic piece is formed integrally with the platform; The light emitting device according to claim 1, wherein the direction of the clamping force applied by the plurality of claws to clamp the power supply board is perpendicular to the surface of the power supply board.

2. The elastic piece includes a root portion connected to the platform and a free end portion remote from the platform, The light emitting device according to claim 1 , wherein the base portion extends in a direction perpendicular to the platform, and the free end portion extends in a direction away from the platform and in a direction away from the power board.

3. 3. The light emitting device according to claim 1, wherein an edge of the power supply board abuts against the platform.

4. The plurality of claws are arranged in two rows, 3. The light-emitting device according to claim 1, wherein the claw portions in one row and the claw portions in the other row are offset from each other, or the claw portions in one row and the claw portions in the other row are aligned with each other.

5. 3. The light emitting device according to claim 1, wherein the number of the plurality of claws is two to four.

6. 3. The light emitting device according to claim 1, wherein the plurality of claws are made of metal.

7. 3. The light emitting device according to claim 1, wherein the case includes a receiving cavity in which the power supply board is received.

8. The light emitting device described in claim 1 or 2, characterized in that the light source module board is attached to the side of the platform away from the case so as to be parallel to the platform, the platform has a through hole, and the power supply board and the light source module board are electrically connected via the through hole.

9. The plurality of claw portions are arranged in two rows, 3. The light emitting device according to claim 1, wherein the claws in one row and the claws in the other row are offset from each other.

Images