JP6043676B2 - LED lighting device - Google Patents

Description

  The present invention relates to an LED lighting device.

  In recent years, various lighting devices using LEDs as light sources have been developed in place of conventional fluorescent lamps, and have been expanded to, for example, hanging type lighting fixtures (pendant light type lighting fixtures) used at home.

  Patent Document 1 describes an LED lighting device in which a substrate on which an LED is mounted is fixed to a lamp body by a fixing component such as a screw.

JP 2009-231028 A

  In the LED illumination device described in Patent Document 1, since the substrate on which the LED is mounted is fixed to the lamp body by a fixing component such as a screw, there is a concern that the number of man-hours required for manufacturing increases.

  An object of the present invention is to provide an LED lighting device at a lower cost by reducing the number of manufacturing steps when fixing a substrate on which an LED is mounted.

An LED, a wiring board on which the LED is mounted, a heat sink having a wiring board mounting portion on which the wiring board is mounted, a backbone for fixing the heat sink, and an insulating plate attached to the backbone A power supply board that controls the LED, a cover shade that is attached to the backbone so as to cover a side surface from the back of the backbone, and a cover shade that is attached on the cover shade and covers the front of the LED. In the LED lighting device, the wiring board is a substantially donut-shaped flat plate component, and includes a circular part on which the LED is mounted to the outer peripheral edge, and a wiring board convex part provided on the outer periphery of the circular part. Thus, a substrate pressing member for locking the wiring substrate convex portion by rotation in the circumferential direction of the wiring substrate is provided on the outer peripheral side of the wiring substrate mounting portion.

  The number of manufacturing steps for fixing the substrate on which the LED is mounted can be reduced, and the LED lighting device can be provided at a lower cost.

It is a whole perspective view of the LED lighting apparatus which concerns on this embodiment. It is the whole instrument main body perspective view which removed the shade from FIG. FIG. 3 is an exploded perspective view of FIG. 2. It is a perspective view of the attachment process 1 of a LED board. It is a perspective view of the attachment process 2 of a LED board. It is a perspective view of the attachment process 3 of a LED board. It is a perspective view of the attachment process 4 of a LED board. It is a perspective view of the attachment process 5 of a LED board. FIG. 5 is an enlarged view of the vicinity of the substrate holder in FIG.

  Hereinafter, an LED lighting device 1 (LED pendant light) according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following, the state when the LED lighting device 1 is attached to the ceiling, that is, the upper side of the paper is the ceiling side of the house, and the lower side of the paper is described with reference to the floor side and the lower state of the house.

  1 is an overall perspective view of the LED lighting device 1 according to the present embodiment, FIG. 2 is an overall perspective view of an instrument body 28 with the shade 26 removed from FIG. 1, FIG. 3 is an exploded perspective view of FIG. FIGS. 5A to 5E are attachment process diagrams of the LED substrate 30, and FIG. 5 is an enlarged view of the vicinity of the substrate holder 15 in FIG.

  In the following description, unless otherwise specified, the floor side (light emission direction of the LED 13) is referred to as the “front side” and the ceiling side is referred to as the “rear side” based on the state where the LED lighting device 1 is attached to the ceiling surface. .

  As shown in FIG. 1, the LED lighting device 1 is of a pendant light type, and includes a hanging tool 29, a shade 26, a cover shade upper 20, a cover shade lower 10, a pendant string 23, and the like. The hanger 29 is connected to the instrument body 28. The shade 26 may be fixed to the instrument main body 28, or may only be covered and locked without being fixed. The LED lighting device 1 can be fixed by attaching the hanging tool 29 to the ceiling.

  As shown in FIG. 2, the instrument main body 28 from which the shade 26 is removed from the LED lighting device 1 includes a hanging tool 29, a backbone 19, an upper cover shade 20, a lower cover shade 10, a pendant string 23, and the like. The instrument body 28 has a round shape when viewed from below.

  As shown in FIG. 3, the instrument main body 28 includes a hanging tool 29, a backbone 19, a cover top 20, an insulating plate 18, a power supply board 17, a heat radiating plate 16, a board presser 15, an LED board 30, a light shielding cover 12, and a packing 11. The lower cover cover 10 and the pendant string 23 are provided. In the present embodiment, the instrument body 28 will be described by taking a round shape as viewed from below, but the present invention can be similarly applied to a square shape.

  The cover shade upper 20 and the cover shade lower 10 are substantially circular and umbrella-shaped parts made of a resin (for example, polypropylene, acrylic, polystyrene, etc.) having translucency (including transparent, translucent, or milky white).

  An opening 10a for exposing the back surface of the backbone 19 is provided on the back side of the cover shade upper 20, and an end portion on the front side of the cover save top 20 is provided on the back side of the cover shade lower 10 side. An annular cover shade upper concave portion 20a for fitting with an annular cover shade lower convex portion 10c provided at the end is provided.

  An opening 10a for pendant string 23 to pass through the center of the cover shade 10 is provided on the surface side of the cover shade 10 and the interior direction of the LED lighting device 1 (light source substrate direction, And a cylindrical portion 10b protruding in the rear side direction). A flat portion (not shown) is provided at the end of the cylindrical portion 10b opposite to the opening 10a. The upper cover shade 20 and the lower cover shade 10 diffuse the luminous flux emitted from the LED 13 to reduce glare when the user looks directly at the LED lighting device 1 or the LED lighting device 1 is installed. It plays a role in making the brightness of the space uniform.

  An annular cover shade lower convex portion 10 c is provided at an end portion of the lower cover shade 10. Further, as described above, an annular cover-sade upper recess 20a is provided at the end of the cover-sade upper 20. When the cover shade lower convex portion 10c and the cover shade upper concave portion 20a are fitted, the cover shade lower portion 10 is locked to the cover shade upper portion 20. The possibility that the lower cover shade 10 will fall due to the fitting of the cover shade lower convex portion 10c and the cover shade upper concave portion 20a is suppressed. Furthermore, by fixing the flat part of the above-mentioned cylindrical part 10b, the LED substrate 30, and the heat radiating plate 16 with screws, the possibility that the cover cover lower part 10 will drop is suppressed. Further, the flat portion 16b and the power supply substrate 17 are screwed through the packing 11 to suppress the entry of insects or the like into the inside of the cover shade 10. The packing 11 is preferably made of an elastic material such as EPDM so that a gap is not easily formed between the packing 11 and the flat portion of the cylindrical portion 10 b and between the packing 11 and the power supply substrate 17.

  The lower cover shade 10 is a resin part having a shape that swells from the end to the center. Therefore, when a force is applied from the outside to the center portion of the cover shade lower 10, the cover shade lower 10 may be bent and recessed. As in the present embodiment, the cylindrical portion 10b is provided in the center between the cover shade lower 10 and the power supply board 17, so that when a force is applied from the outside in the vicinity of the center portion of the cover shade lower 10 under the cover shade. Ten deformations can be suppressed.

  The cover top 20 and the backbone 19 are connected so that there is no gap when the instrument main body 28 is viewed from the back side of the cover top 20 with the cover top 20 and the backbone 19 connected. This is for preventing insects and the like from entering the instrument main body 28. Therefore, it is desirable to have a structure that does not provide more holes than necessary on the coverside 20 and the back side of the backbone 19.

  In the present embodiment, by providing the heat radiating plate 16 described later, the volume of the heat radiating space is increased (the amount of air in the heat radiating space is increased), and the contact area between the heat radiating plate 16 and the air is increased, The heat dissipation efficiency of the power supply board 17 and the LED board 30 is improved. As a result, it is possible to realize the LED lighting device 1 with high luminous efficiency of the LED 13 and excellent drawability of the heat sink 16 and excellent productivity.

  The LED board 30 includes a donut-shaped wiring board 14 and a plurality of LEDs 13 arranged in a plurality of rows (in this embodiment, seven rows) concentrically on one side of the wiring board 14 (the mounting surface side of the LEDs 13). It is configured to include. The LEDs 13 are all composed of the same type of element that emits a white light beam.

  The wiring board 14 is formed by forming an insulating layer and a copper foil pattern on a flat plate made of aluminum or an aluminum alloy, or a copper foil pattern and a solder resist on a flat plate made of a resin having good thermal conductivity (such as polyimide resin). Etc. are formed. That is, the wiring board 14 receives heat conduction through the terminal (not shown) of the LED 13 or the heat dissipation pad (not shown) provided on the back side of the LED 13 for the purpose of bringing the LED 13 into close contact with the wiring board 14. The heat generated by the light emission of the plurality of LEDs 13 is quickly transferred and radiated.

  Moreover, although the wiring board 14 is comprised so that it may become a substantially donut shape by one sheet, it is not this limitation. Two substrates having a substantially semi-doughnut shape may be combined to form a substantially donut shape, or a combination of three or more substrates may be used. However, the effect of facilitating the assembly of the LED substrate 30 is achieved by reducing the number of divisions.

  The wiring board 14 includes a circular portion 14a and four wiring board convex portions 14b on the outer periphery of the circular portion 14a. The wiring board 14 is locked to the board holder 15 by the wiring board protrusion 14 b entering a locking part 15 b of the board holder 15 described later. Furthermore, wiring board screw insertion holes 14c for screw-fixing the LED board 30 to the heat sink 16 are formed in a central portion of the wiring board 14 at a plurality of locations. In this embodiment, four wiring board convex portions 14b are provided. However, when the wiring board 14 is taken from one plate, it is more preferable to use four convex portions than three convex portions. This is because the wiring board 14 can be taken.

  The wiring board 14 may be provided with a white reflection sheet (not shown) on the surface thereof. This reflection sheet has a function of re-reflecting light that has been radiated from the LED 13 and then reflected and returned from the inner surface such as under the cover shade 10 toward the surface side, and is located at a position corresponding to each LED 13. Small holes are formed.

  Further, the wiring board 14 has a diameter dimension D1 longer than the diameter dimension D2 of the flat portion (mounting surface) 16b of the heat sink 16. That is, when the LED substrate 30 in the present embodiment is placed on the flat portion (mounting surface) 16b of the heat radiating plate 16, the outer peripheral edge portion of the LED substrate 30 (the outermost circumference and the inner circumference of two rows). The substrate region in which the LEDs 13 are disposed has a structure that does not contact the flat portion 16 b of the heat sink 16.

  In the LED substrate 30 configured in this way, the surface opposite to the light emitting surface (mounting surface) of the LED 13 is in close contact with the flat portion 16b of the frustum portion 16a of the heat radiating plate 16 whose longitudinal section is a hat shape. Maintained and attached. Therefore, according to the present embodiment, the heat and heat dissipation related to the LED substrate 30 and the heat radiating plate 16 function synergistically to quickly cool the heat generated by the light emission of the plurality of LEDs 13. It becomes possible.

  Moreover, in the LED board 30 which concerns on this embodiment, the structure which expands an area to center part vicinity of the LED lighting apparatus 1 and arrange | positions LED13 is employ | adopted. If comprised in this way, the brightness can be made substantially uniform from the center part of LED lighting apparatus 1 to a peripheral part.

  In the center of the LED substrate 30, two safety light LEDs 25 are provided. In the present embodiment, the light shielding cover 12 that is an annular part made of resin such as polypropylene and having a light shielding cover wall portion 12a is provided so as to shield between the safety light LED 25 and the cylindrical portion 10b. The light shielding cover wall portion 12a of the light shielding cover 12 blocks the light emitted from the safety light LED 25 and eliminates the light passing through the cylindrical portion 10b in the center of the cover shade 10 so that a cylinder is formed on the surface of the cover shade 10 below. The shadow of the part 10b is not reflected.

  The substrate holder 15 is a substantially ring-shaped component made of resin (for example, polypropylene, acrylic, polystyrene, etc.). The substrate holder 15 includes an annular portion 15a and a locking portion 15b. The inner diameter of the annular portion 15 a of the substrate holder 15 is larger than the outer diameter of the circular portion 14 a of the wiring substrate 14. The latching | locking part 15b is a part protruded from the cyclic | annular part 15a to the cover shade lower 10 side (surface side). The locking part 15b has a locking part opening 15b1 in the circumferential direction. The wiring board convex part 14b enters from the latching part opening 15b1, and the wiring board convex part 14b is latched by the latching part 15b, whereby the wiring board 14 is latched by the board presser 15. In the present embodiment, the board pressing member 15 has four locking portions 15b. This is because there are four wiring board convex portions 14b to be locked.

  In addition, in this embodiment, although the board | substrate holding | suppressing 15 and the heat sink 16 were made into the different body, it is not this limitation. The wiring board convex part 14b should just have the function latched by the latching | locking part 15b, and you may shape | mold by one component. When the substrate holder 15 and the heat sink 16 are formed as separate parts as in this embodiment, they can be formed from different materials. Since it can be formed of another material, a highly effective material (such as aluminum) is selected for the heat sink 16 having a large area in contact with the LED substrate 30, and the substrate holder 15 that needs to properly lock the LED substrate 30 is used. You can choose an appropriate material, such as a material that is easy to make (such as polypropylene) or a material with high rigidity (such as ceramics). On the other hand, when molding with one component, there is an effect of reducing the number of components and an effect of reducing the number of manufacturing steps for fixing the substrate presser 15.

  The locking portion opening 15b1 is an opening having the same size as the thickness of the wiring board 14 from a position at the same height as the flat portion 16b of the heat radiating plate 16 when the substrate retainer 15 is attached to the heat radiating plate 16. It is desirable that By making the opening 10a of the above-mentioned size, there is an effect that the LED board 30 after the LED board 30 is attached to the locking part 15b has less room to move in the vertical direction and can be locked better. Play. In addition, there is an effect that the back side of the LED substrate 30 and the surface side of the heat radiating plate 16 are in contact with each other to enhance the heat radiation effect.

  In the present embodiment, the substrate pressing member 15 is a component composed of the annular portion 15a and the locking portion 15b, but this is not restrictive. The wiring board convex part 14b should just have the function latched by the latching | locking part 15b, for example, the component which consists only of the latching | locking part 15b may be sufficient.

  On the back side of the heat radiating plate 16, a backbone 19, an insulating plate 18, and a power supply substrate 17 are provided from components close to the ceiling side.

  The backbone 19 is a part formed by processing a metal plate or the like into a substantially circular shape, for example. In the center of the backbone 19, an instrument mounting portion 19a, which is a substantially circular hole, is provided. The above-described mounting adapter is engaged and fixed to the instrument mounting portion 19a via a hooking portion (not shown). The mounting adapter is engaged and fixed to the indoor wiring device on the ceiling side. Thereby, the LED lighting device 1 including the backbone 19 is fixed to a predetermined position on the ceiling surface via the mounting adapter, the fixture mounting portion 19a, and the indoor wiring fixture.

  A power supply connection portion (not shown) is provided in the vicinity of the instrument mounting portion 19a. The power supply connecting portion electrically connects the mounting adapter and the power supply board 17 via an electric wire (not shown). Thereby, the LED lighting device 1 receives power supply through the indoor wiring device, the mounting adapter, the power supply connection portion, and the power supply board 17.

  The insulating plate 18 is provided between the backbone 19 and the heat radiating plate 16. Both the backbone 19 and the heat sink 16 are made of metal. On the other hand, the insulating plate 18 is molded using a resin material such as polypropylene having electrical insulation and flame retardancy.

  The power supply substrate 17 is held via a substrate locking portion 18 a that protrudes from the outer edge of the insulating plate 18.

  By the way, the heat sink 16 has a function of cooling the LED substrate 30 mainly by heat conduction.

  The LED 13 itself and surrounding components deteriorate due to heat generated by light emission. In order to suppress such deterioration and realize a long life and high reliability, it is required to perform appropriate heat dissipation.

  Further, when the power supply substrate 17 and the LED substrate 30 generate heat, the ambient temperature of the heat dissipation space surrounded by the heat dissipation plate 16 increases. At this time, if the volume of the heat radiating space is small, heat is likely to be trapped inside the main body, which causes deterioration of the electronic components and causes the luminous efficiency of the LED 13 to decrease. Therefore, in this embodiment, the heat radiating plate 16 is made of, for example, a metal having a good thermal conductivity such as a galvanized steel plate or aluminum so that its longitudinal section has a hat shape and the internal volume is increased as much as possible. From the standpoint of maintaining good thermal conductivity, it is formed integrally with the joint by drawing.

  The heat sink 16 employs a structure having a substantially circular frustum portion 16a and a substantially donut-shaped (substantially annular) outer peripheral fixing portion 16c on the outer peripheral side (radially outer side) of the frustum portion 16a. Yes.

  More specifically, the frustum portion 16a of the heat radiating plate 16 is manufactured by drawing a single thin circular metal plate. The frustum portion 16a has a circular flat portion 16b (mounting surface) on which the back surface of the LED substrate 30 is placed in contact with the surface, and the diameter increases from the outer peripheral edge of the flat portion 16b toward the back surface side. And a cylindrical inclined portion that extends while extending.

  The flat portion 16b is formed with a plurality of screw fixing holes for fixing the LED substrate 30 to the heat radiating plate 16 with screws.

  The substrate holder 15, the heat radiating plate 16, and the insulating plate 18 are fixed to the backbone 19 with screws. In the present embodiment, a board holding screw insertion hole 15 c that is a screwing hole provided in the board holding member 15, a heat radiation plate screw insertion hole 16 d that is a screwing hole provided in the heat dissipation plate 16, and the backbone 19. The positions of the screw holes (not shown) are matched and screwed to reduce the number of parts and the number of manufacturing steps of the LED lighting device 1.

  When assembling the LED lighting device 1, first, the insulating plate 18 is attached to the front side of the backbone 19. Subsequently, the power supply substrate 17 is attached to the front side of the insulating plate 18. Subsequently, the heat sink 16 and the substrate holder 15 are attached to the backbone 19 so as to cover the power supply substrate 17. Here, the heat sink 16 and the substrate retainer 15 are attached to the backbone 19 by aligning the positions of the substrate retainer screw insertion hole 15c of the substrate retainer 15, the heat dissipation plate screw insertion hole 16d of the heat sink 16, and the screw fixing hole of the backbone 19. (See FIGS. 4 (a) and 4 (b)). Thereby, reduction of a manufacturing man-hour can be aimed at. Subsequently, the LED board 30 is locked by the board presser 15. Then, it attaches to the heat sink 16 so that the LED board 30 may be pinched | interposed by the light shielding cover 12. FIG. Subsequently, the cover shade upper 20 is attached to the backbone 19 so as to cover the side surface from the back surface of the backbone 19. Subsequently, the lower cover cover 10 is attached to the upper cover cover 20 so as to cover the side surface from the front surface of the LED substrate 30. The connection between the cover shade upper 20 and the cover shade lower 10 is performed by fitting the cover shade upper concave portion 20a and the cover shade lower convex portion 10c. At this time, the upper portion of the cover shade 20 and the lower portion of the cover shade 10 are fitted so that the flat portion of the cylindrical portion 10 b in the lower portion 10 of the cover shade comes into contact with the LED substrate 30 via the packing 11. Thereby, a possibility that an insect etc. may enter into LED lighting device 1 from opening 10a under cover shade 10 can be reduced. At the end of the process, a hanging tool 29 is attached to the back side of the backbone 19, and at this time, a lead wire (not shown) that is pulled from the ceiling or the like and passes through the inside of the hanging tool 29 is located on the back side of the backbone 19. Attach to 17 connectors.

  The locking of the LED board 30 by the board presser 15 will be described. After the state as shown in FIG. 4A, the LED substrate 30 is moved to the heat radiating plate 16 side (back side) (see FIG. 4B). Subsequently, the LED substrate 30 is rotated in the circumferential direction (see FIG. 4C). When the LED substrate 30 is rotated in the circumferential direction, the wiring board convex portion 14b enters the locking portion 15 from the locking portion opening 15b1 (see FIG. 4D). When the wiring board convex part 14b enters the locking part 15, the LED board 30 is locked by the board presser 15, and the possibility of dropping is suppressed (see FIGS. 4E and 5). Thereby, the man-hour which attaches LED board 30 to the heat sink 16 is reduced. In the present embodiment, the light shielding cover 12 is provided in order to prevent the light emitted from the safety light LED 25 from being shaded when it passes through the cylindrical portion 10b and reaches the bottom 10 of the cover shade. In the present embodiment, the light shielding cover 12 and the heat sink 16 are fixed by screwing so as to pass through the wiring board screw insertion holes 14c so as to sandwich the LED board 30 (see FIG. 4E). Thereby, the back side of LED board 30 and the surface side of heat sink 16 will be pressed, and it will contact rather than the case where it does not fix, and it becomes possible to raise a heat dissipation effect.

  As described above, the wiring board 14, which is a flat plate component on which the LED 13 is placed, has a shape including the circular portion 14 a on which the LED 13 is placed and the wiring substrate convex portion 14 b provided on the outer periphery of the circular portion 14 a. By providing the board pressing member 15 for locking the wiring board convex part 14b by the rotation of the wiring board 14 in the circumferential direction on the outer peripheral side of the flat part 16b (the part on which the wiring board 14 is placed) in the heat radiating plate 16, As a result, it is possible to reduce the number of manufacturing steps for fixing the wiring board 14 on which the LED lighting device 1 is mounted, and to provide the LED lighting device 1 at a lower cost.

DESCRIPTION OF SYMBOLS 1 LED illuminating device 10 Cover cover lower part 10a Opening part 10b Cylindrical part 10c Cover shade lower convex part 11 Packing 12 Light shielding cover 12a Light shielding cover wall part 13 LED
14 Wiring board 14a Circular part 14b Wiring board convex part 14c Wiring board screw insertion hole 15 Substrate presser 15a Annular part 15b Locking part 15b1 Locking part opening 15c Substrate pressing screw insertion hole 16 Heat sink 16a Frustum part 16b Flat part 16c Outer periphery Fixing part 16d Heat sink screw insertion hole 17 Power supply board 18 Insulating board 18a Board locking part 19 Backbone 19a Instrument mounting part 20 Coversade upper part 20a Coversade upper concave part 23 Pendant string 25 Security light LED
26 SEED 28 Instrument body 29 Suspension tool 30 LED board

Claims (3)

An LED, a wiring board on which the LED is mounted, a heat sink having a wiring board mounting portion on which the wiring board is mounted, a backbone for fixing the heat sink, and an insulating plate attached to the backbone A power supply board that controls the LED, a cover shade that is attached to the backbone so as to cover a side surface from the back of the backbone, and a cover shade that is attached on the cover shade and covers the front of the LED. In LED lighting device,
The wiring board is a substantially donut-shaped flat plate component, and includes a circular part on which the LED is mounted to the outer peripheral edge part, and a wiring board convex part provided on the outer periphery of the circular part,
An LED lighting device, wherein a substrate pressing member that locks the wiring substrate convex portion by rotation in the circumferential direction of the wiring substrate is provided on the outer peripheral side of the wiring substrate mounting portion. The LED lighting device according to claim 1,
The LED lighting device according to claim 1, wherein the substrate holder is separate from the heat sink and the backbone. The LED lighting device according to claim 1 or 2,
The wiring board has a diameter dimension longer than the diameter dimension of the wiring board mounting portion,
The said board | substrate holding | suppressing has an annular part and the latching | locking part which protrudes from this annular part, and latches the said wiring board convex part by the said latching | locking part, The LED lighting apparatus characterized by the above-mentioned.