JP2010225546A - LED lighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large LED lighting apparatus of which weight is reduced and waterproofing is secured. <P>SOLUTION: The LED lighting apparatus 1 includes an LED module 2 which has a substrate 7 mounting a light-emitting diode 8 and a power supply circuit component 9, a translucent cover 3 which is formed in a box shape having a first opening 12 and houses the LED module 2, a filling material 4 which is filled in the cover 3 so as to cover at least a charging portion of the LED module 2 and has translucency and insulation performance, and an apparatus body 5 which is formed in a box shape having a second opening 16 and installs the cover 3 detachably. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a lighting fixture using a light emitting diode (LED) as a light source, and more particularly to a waterproof LED lighting fixture.

Since LED lighting fixtures need to illuminate the surface to be illuminated with moderate brightness, a large number of light emitting diodes are mounted on a substrate, and a heat sink (heat sink) is provided directly or indirectly on the substrate to emit light. Heat generated in the diode is dissipated from the heat sink.

In addition, LED lighting fixtures are being used as outdoor lighting fixtures such as security lights from the viewpoints of energy saving and maintenance saving. This outdoor lighting fixture is required to have a certain degree of waterproofness so that moisture does not enter the inside of the fixture body. For example, a light-emitting unit and a lighting device that can withstand outdoor use have been proposed (see Patent Document 1).

This prior art lighting device includes an LED module having a light emitting unit having a light emitting part and a power receiving terminal electrically connected to the light emitting part, and a mounting recessed part having a mounting surface on which the LED module is mounted as a bottom surface. A heat sink having a connection terminal that is connected to a power receiving unit of the LED module attached to the mounting surface and feeds power to the light emitting unit from the outside, and a fixture that fixes the LED module to the heat sink. And an embedded resin body that fills the mounting recess of the heat sink and covers the connection portion between the power receiving terminal of the LED module and the connection terminal of the fixture. For example, the light emitting unit is used outdoors. However, it is possible to eliminate the intrusion of moisture between the LED module and the fixture.

JP 2006-310138 A (pages 4, 8 and 4)

The light emitting unit of Patent Document 1 has a configuration in which the LED module is mounted in a mounting recess provided in the heat sink, and thus the heat sink is increased in size and the instrument body is increased in size. Increasing the size of the heat sink is preferable from the viewpoint of dissipating the heat generated in the light emitting section, but has the disadvantage of increasing the weight even if the heat sink is made of relatively light aluminum (Al). Therefore, the light emitting unit is difficult to apply to a large-sized outdoor lighting device such as a security light or a street light.

An object of this invention is to provide the large sized LED lighting fixture by which weight increase is suppressed and waterproofing is achieved.

The invention of the LED lighting apparatus according to claim 1, wherein the light emitting diode, the power supply circuit component for lighting the light emitting diode, and the light emitting diode and the power supply circuit component are mounted so that the light emitting diode is mounted on one side. A light-transmitting cover that is formed in a box shape having a first opening and that houses the LED module so as to be opposed to the light-emitting diode; A translucent and insulating filler filled in the cover so as to cover at least the charging part of the LED module; and a box-like shape having a second opening, the first and second An instrument main body to which the cover is detachably attached so that the openings of the instrument are communicated with each other.

In the present invention and the following inventions, each configuration is as follows unless otherwise specified.

The power supply circuit component may be mounted on one side of the substrate or on the other side of the opposite side, or on both the one side and the other side.

The substrate may be a resin material such as a glass epoxy material or a paper phenol material, or a metal plate such as an aluminum (Al) plate or a ceramic plate. In the case of a metal plate, a surface-mounted light emitting diode or power supply circuit component is mounted via an insulating layer formed on the surface thereof.

The filler desirably has high thermal conductivity in addition to translucency and insulation, and for example, a resin such as a silicone resin or a urethane resin can be used.

“The charging part of the LED module” refers to the electrodes and leads of the light emitting diode and the power supply circuit component, the pad portion of the substrate, the soldering portion, and the like.

The instrument main body may be made of metal or resin, but those having high thermal conductivity are suitable. For example, the instrument main body can be formed of aluminum die cast, polybutylene terephthalate resin, or the like.

According to the present invention, the LED module is accommodated in the cover, and at least the charging part thereof is covered with the light-transmitting and insulating filler, so that even if moisture enters the cover, the leakage of the LED module is prevented. And short circuit and corrosion of live parts are prevented. And the emitted light of a light emitting diode permeate | transmits a filler, and is radiate | emitted outside from a translucent cover. Further, the heat generated in the LED module as the light emitting diode is turned on is released from the cover or the instrument body to the outside air via the filler. Thereby, the temperature rise of a light emitting diode is suppressed.

The invention of the LED lighting device according to claim 2 is the invention of the LED lighting apparatus according to claim 1, wherein the power supply circuit component is mounted on one surface side where the light emitting diode is mounted, and the cover and the power supply are mounted. An opaque material is provided between the circuit components.

The opaque material is, for example, a paint applied to the inner surface of the cover, a thin and flexible metal plate or resin plate provided on the inner surface side of the cover. Moreover, the opaque material does not need to be completely opaque, and may have transparency with a transmittance of 50% or less.

According to the present invention, the opaque material makes it difficult to see the power circuit component from the outside of the cover.

According to the first aspect of the present invention, the LED module is covered with the light-transmitting and insulating filler filled in the cover, so that the LED module can be used even if moisture enters the cover. This prevents water leakage, short circuits, and corrosion of live parts, so that it is waterproof and can be used outdoors, and the filler filled in the cover has a relatively low specific gravity and heat dissipation. Since the body does not need to be formed in a large size, it is possible to provide a large-sized LED lighting apparatus that is prevented from being weighted and is relatively light.

According to the second aspect of the present invention, when the LED lighting apparatus is looked up, it is difficult to see the power supply circuit components in the cover, so it is possible to make it difficult for a person to feel uncomfortable.

The schematic cross-sectional view of the LED lighting fixture which shows Example 1 of this invention. The schematic longitudinal cross-sectional view of the LED lighting fixture which shows Example 2 of this invention. The schematic cross-sectional view of the LED lighting fixture which shows Example 3 of this invention.

The present invention accommodates an LED module in a cover, fills the cover with a light-transmitting and insulating filler so as to cover at least the charging part of the LED module, and the cover is detachably attached to the instrument body. It is a thing. Then, the heat radiating body is thermally coupled to the substrate of the LED module and the inner surface of the fixture body, respectively, and the heat generated in the LED module is released from the fixture body to the outside air.

FIG. 1 is a schematic cross-sectional view of an LED lighting apparatus showing Example 1 of the present invention. The LED lighting apparatus 1 is a security light installed outdoors, and includes an LED module 2, a cover 3, a resin 4 as a filler, an apparatus main body 5, and a radiator 6.

The LED module 2 includes a substrate 7, a light emitting diode (LED) 8, and a power supply circuit component 9. The substrate 7 is made of, for example, a rectangular glass epoxy material, and both surfaces 7a and 7b are formed flat, and the light emitting diode 8 and the power supply circuit component 9 are mounted on the one surface (front surface) 7a side. The light emitting diode 8 is a surface mount type and is formed to emit visible light, for example, white light. A plurality of them are linearly arranged at equal intervals from the central portion side in the longitudinal direction of the substrate 7 to one end side. The plurality of light emitting diodes 8 are connected in series by a wiring pattern (copper stay pattern) (not shown) formed on one surface 7 a of the substrate 7 and connected to the power supply circuit component 9.

The power supply circuit component 9 is a component of a power supply circuit for lighting the light emitting diode 8, and is composed of a number of components such as a transistor Q1, a capacitor C1, a diode D1, an inductor (not shown), a resistor, and a transformer. Arranged at the end portion. Further, the component having the lead among the power supply circuit components 9 is soldered on the other surface (back surface) 7 b side opposite to the one surface 7 a of the substrate 7. A wiring pattern (not shown) is formed on the other surface 7b, and the power supply circuit components 9 are electrically connected. And the lead wire 11 with the male connector 10 is derived | led-out from the other surface 7b. The power supply circuit is configured to input an AC power supply (AC 100 V) from the lead wire 11, convert the AC power supply to a predetermined DC power supply, and supply a constant current to the light emitting diode 8.

The cover 3 is made of translucent acrylic resin, for example, and is formed in a substantially bowl-shaped box shape having first openings 12 and flanges (projections) 13 and 13 on both sides in the longitudinal direction. The cover 3 is arranged so that the light emitting diode 8 is on the opposite side of the first opening 12, that is, the light emitting diode 8 faces the bottom 3 a of the cover 3 and faces the light emitting diode 8. Contained. The flanges 13 and 13 are provided with holes 14 and 14 for attaching the cover 3 to the instrument body 5.

Further, the cover 3 is provided with an opaque material 15 on the other end side in the longitudinal direction and between the power supply circuit component 9 of the LED module 2 and on the inner surface 3a side facing directly. The opaque material 15 is, for example, a black paint applied to the inner surface 3 a of the cover 3, and attenuates the transparency of the cover 3.

The resin 4 is made of, for example, a silicone resin having translucency and electrical insulation and high thermal conductivity. The resin 4 is filled in the cover 3 and covers the entire LED module 2. That is, in addition to the electrode of the light emitting diode 8 that is the charging part of the LED module 2, the electrode and the lead of the power circuit component 9, the soldered portion of the power circuit component 9 on the other surface 7 b of the substrate 7 is also covered with the resin 4. Yes. After the LED module 2 is temporarily fixed in the cover 3, the resin 4 is injected into the cover 3 and solidified to fix the LED module 2 in the cover 3.

The specific gravity of the silicone resin 4 is about 1.2, which is very small compared to the specific gravity 2.7 of aluminum (Al), which has a relatively small specific gravity among metals. Even if 2 is accommodated and the silicone resin 4 is filled, the entire cover 3 is not weighted.

The instrument body 5 is made of, for example, aluminum die-casting, and has a second opening 16 and flanges (protrusions) 17 and 17 on both sides in the longitudinal direction, and the edge of the second opening 16 and the flanges 17 and 17 17 is formed in a substantially bowl-shaped box shape that can overlap the edge portion of the first opening 12 provided in the cover 3 and the flange portions 13, 13. The flanges 17 and 17 are provided with holes 18 and 18 corresponding to the holes 14 and 14 of the cover 3.

The instrument body 5 is attached with the cover 3 such that the waterproof packing 19 is interposed and the second opening 16 and the first opening 12 of the cover 3 communicate with each other. That is, the edge and the flanges 17 and 17 of the second opening 16 of the instrument main body 5 and the edge and the flanges 13 and 13 of the first opening 12 of the cover 3 are respectively connected with the waterproof packing 19 therebetween. The nuts 21, 21 are screwed onto the screws 20, 20 inserted through the holes 18, 18 of the instrument body 5 and the holes 14, 14 of the cover 3 through the waterproof packing 19. The instrument body 5, the waterproof packing 19 and the cover 3 are fastened together by the portion and the nuts 21 and 21.

Note that the cover 3 can be attached to the instrument body 5 more firmly by screwing the cover 3 to the instrument body 5 at parts other than the collar parts 13 and 13 of the cover 3 and the collar parts 17 and 17 of the instrument body 5. become. Then, the cover 3 is removed from the instrument body 5 by removing the screws 20 and 20 and the nuts 21 and 21. Thus, the instrument body 5 has the cover 3 detachably attached thereto.

And the hole 22 is formed in the one end side surface 5a of the instrument main body 5. FIG. The hole 22 is provided with a waterproof bush 23. And the power supply line 24 is introduced into the instrument main body 5 from the outside through the waterproof bush 23. A female connector 25 is connected to the tip of the power line 24. The female connector 25 is connected to the male connector 10 of the lead wire 11 led out from the substrate 7 of the LED module 2. The commercial power supply (not shown) is input to the LED module 2 through the power line 24.

Moreover, the instrument main body 5 is being fixed to the coupling 26 by which the upper surface 5d side was formed in the substantially square shape with the screw | thread etc. which are not shown in figure. The joint 26 is fixed to a utility pole, support column, wall surface, or the like (not shown) so as to be perpendicular to the ground surface. Thereby, the instrument main body 5, the cover 3, etc. incline upward with respect to the ground surface. The power line 24 led out from the instrument main body 5 is fixed to the joint 26 with a band 27 or the like and led to the commercial AC power source side.

The radiator 6 is made of a metal having high thermal conductivity, such as aluminum (Al), the upper surface 6a and the lower surface 6b are flat and have a predetermined thickness, and the other end side lower surface 6bb side is notched. It is formed in the portion 28. The notch 28 is separated from the soldered portion of the power supply circuit component 9 on the substrate 7. And the resin 4 is filled in the clearance gap between the notch part 28 and the other surface (back surface) 7b of the board | substrate 7, and the heat radiator 6 and the charging part of the LED module 2 are electrically insulated. Further, a hole 29 through which the lead wire 11 with the male connector 10 is inserted is formed on the cutout portion 28 side.

And as for the heat sink 6, the lower surface 6b has stuck the other surface 7b except the soldering part of the power circuit component 9 of the board | substrate 7 with the adhesive material which is not shown in figure. That is, the substrate 7 is fixed to the radiator 6 with an adhesive. Further, when the cover 3 is attached to the instrument main body 5, the heat radiating body 6 has one end side face 5a, the other end side face 5b, a front face (not shown) between the both side faces 5a and 5b, and the instrument main body 5. It is formed in the size which contacts each inner surface of the back surface 5c. Thus, the radiator 6 is thermally coupled to the substrate 7 of the LED module 2 and the inner surface of the fixture body 5.

Next, the operation of the first embodiment of the present invention will be described.

When the LED module 2 is fed via the power line 24 and the lead wire 11, the light emitting diode 8 is turned on. Visible light (white light) radiated from the light emitting diode 8 passes through the translucent resin 4, passes through the transparent cover 3, and is emitted to the ground surface side that is the irradiated surface. Thereby, the ground surface side is illuminated. And since the black paint 15 as an opaque material is apply | coated to the inner surface 3a which opposes the power supply circuit component 9 of the LED module 2 for the cover 3, when the LED lighting fixture 1 is looked up from the ground surface side, the cover 3 The power circuit component 9 is difficult to see through.

And the heat | fever which generate | occur | produced in LED module 2 with the lighting of the light emitting diode 8 is transferred to the heat radiator 6 fixed to the board | substrate 7 from the board | substrate 7, and the instrument which is contacting the heat radiator 6 from the heat radiator 6 Heat is transferred to the main body 5 and released from the instrument main body 5 to the outside air. Since the radiator 6 is made of, for example, aluminum (Al) having high thermal conductivity, and the instrument body 5 is made of, for example, aluminum die casting having high thermal conductivity, the heat generated in the LED module 2 is quickly generated. Heat is transferred to the outside air. Thereby, the temperature rise of the light emitting diode 8 is suppressed, the light emitting diode 8 can have a long life, and the change in the color tone of the visible light emitted from the light emitting diode 8 can be prevented.

As described above, the present invention allows the translucent cover 3 to function as a tray for the resin 4 so that the light-emitting diode 8 and the power supply circuit component 9 can be filled with the resin at the same time, and a waterproof device is manufactured with fewer steps. Can do. Moreover, the heat equalization of the LED lighting fixture 1 whole can be accelerated | stimulated by resin-filling a heat-emitting component. In the first embodiment, the light emitting diode 8 and the power supply circuit component 9 are mounted on the one surface 7 a side of the common substrate 7, and the LED module 2 can be covered with less resin 4.

Further, since the cover 3 is attached to the instrument body 5 via the waterproof packing 19, it is difficult for moisture such as rain water to enter the cover 3 from between the cover 3 and the instrument body 5. Even if moisture enters the cover 3, the LED module 2 is covered with the insulating resin 4 filled in the cover 3, so that leakage of the LED module 2 due to moisture, short circuit, and corrosion of the charged part Etc. can be prevented. That is, the LED lighting device 1 has waterproofness and can be used as an outdoor lighting device even outdoors.

Further, the resin filled in the cover 3, for example, the silicone resin 4 has a relatively small specific gravity of about 1.2, and the radiator 6 is thermally coupled to the substrate 7 and the instrument body 5 of the LED module 2, respectively. The cover 3 is only required to be formed in a large size and does not need to be formed in a large size. Accordingly, it is possible to provide a large LED lighting apparatus 1 that is relatively light in weight. In addition, since the refractive index of the silicone resin 4 is about 1.4, which is larger than 1.0 of air, the amount of emitted light emitted from the cover 3 is increased, and the emission efficiency can be improved. .

Since the cover 3 is coated with the black paint 15 as an opaque material on the inner surface 3a facing the power circuit component 9 of the LED module 2, the power circuit in the cover 3 when the LED lighting apparatus 1 is looked up. The component 9 is difficult to see, and this can make it difficult for a person to feel uncomfortable.

Moreover, since the cover 3 is detachably attached to the instrument main body 5, the LED module 2 with reduced luminous flux can be replaced by replacing the cover 3 having the light emitting diodes 8. Moreover, it can replace with the LED lighting fixture 1 of a different luminescent color.

The cover 3 is detachably fixed to the instrument body 5 using screws 20 and nuts 21, but is not limited thereto, and other attaching / detaching means such as a latch device may be used.

FIG. 2 is a schematic longitudinal sectional view of an LED lighting apparatus showing Example 2 of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

The LED lighting fixture 30 shown in FIG. 2 is a LED lighting fixture 1 shown in FIG. 1, in which a plurality of light emitting diodes 8 are linearly mounted on one surface 7 a side of the substrate 7, and a power supply circuit on the other surface 7 b side of the substrate 7. It has an LED module 31 on which a component 9 is mounted. Further, a cover 32 formed in a substantially rectangular parallelepiped box shape is provided in place of the cover 3. The entire LED module 31 is covered with the resin 4 so that the light emitting diode 8 is close to the bottom surface 32 a of the cover 32. Further, the heat radiating body 33 is formed in a substantially rectangular parallelepiped shape, and is fixed to the inner surface of the instrument body 5 with an adhesive, screws, or the like (not shown). When the cover 32 is attached to the instrument body 5, the resin 4 is brought into contact with the radiator 33.

When the LED module 31 is fed, the light emitting diode 8 is turned on. Since the light emitting diode 8 is close to the bottom surface 32 a of the cover 32, the emitted light is hardly absorbed by the translucent resin 4 and is efficiently emitted from the cover 32 to the outside. Further, the light emitting diode 8 is mounted over a longitudinal region on the one surface 7a side of the substrate 7, and its quantity is larger than that of the LED module 2 of FIG. The amount of light increases. Therefore, the illuminated surface (the ground surface) can be illuminated brightly.

Then, the light generated in the LED module 31 by the lighting of the light emitting diode 8 is transferred to the resin 4. Since the resin 4 is made of, for example, a silicone resin having high thermal conductivity, heat is transferred quickly, and the entire resin 4 has a substantially uniform temperature. Then, heat is transferred to the heat radiating body 33 that is in contact with the resin 4 and is released from the instrument body 5 to the outside air. Since the contact area between the resin 4 and the radiator 33 is larger than the contact area between the resin 4 and the radiator 6 shown in FIG. 1, the heat generated in the LED module 31 is quickly transferred. Thereby, the temperature rise of the light emitting diode 8 is further suppressed, and the light emitting diode 8 can have a longer life.

Since the entire LED module 31 is covered with the insulating resin 4, even if moisture enters the cover 32, the leakage of the LED module 31, a short circuit, and corrosion of the charged part are prevented. Is done. That is, the LED lighting fixture 30 has waterproofness and can be used outdoors.

FIG. 3 is a schematic cross-sectional view of an LED lighting apparatus showing Embodiment 3 of the present invention. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.

The LED lighting device 34 shown in FIG. 3 is the same as the LED lighting device 1 shown in FIG. 1, the power supply circuit component 9 is mounted on the one surface 7 a side of the substrate 7 and in the center portion 7 </ b> C in the longitudinal direction. , 7E, the LED module 35 on which the light emitting diode 8 is mounted. A box-shaped cover 37 having a portion facing the power supply circuit component 9 formed in the bulging portion 36 is provided. A black paint 15 as an opaque material is applied to the inner surface 36 a of the bulging portion 36. The entire LED module 35 is covered with the resin 4 so that the light emitting diode 8 is close to the bottom surface 37 a of the cover 37 and the power circuit component 9 is close to the inner surface 36 a of the bulging portion 36. . The resin 4 is brought into contact with the radiator 33 when the cover 37 is attached to the instrument body 5.

The LED module 35 has its light emitting diode 8 close to the inner surface 37a of the cover 37 and its power supply circuit component 9 is close to the inner surface 36a of the bulging portion 36. Therefore, the LED module 35 is filled in the cover 37. The filling amount of the covering resin 4 can be reduced. Accordingly, the cost of the resin 4 is reduced and the weight is reduced, so that an increase in the cost of the LED lighting fixture 34 can be suppressed and the LED lighting fixture 34 can be further reduced in weight.

The LED lighting fixtures 1, 30, and 34 of the present invention can be used as outdoor lighting fixtures such as outdoor crime prevention lights and street lamps, and can also be used as bathroom lighting fixtures and general lighting fixtures in buildings. It is.

DESCRIPTION OF SYMBOLS 1,30,34 ... LED lighting fixture, 2, 31, 35 ... LED module, 3, 32, 37 ... Cover, 4 ... Resin as filler, 5 ... Appliance main body

Claims (2)

An LED module comprising: a light emitting diode; a power supply circuit component for lighting the light emitting diode; and a substrate on which the light emitting diode and the power supply circuit component are mounted so that the light emitting diode is mounted on one side. A translucent cover that is formed in a box shape having a first opening and accommodates the LED module so as to be opposed to the light emitting diode; and at least the charging part of the LED module is covered A translucent and insulating filler filled in the cover; formed in a box shape having a second opening, the cover being detachable so that the first and second openings communicate with each other An LED lighting fixture comprising: a fixture main body to be attached; The LED illumination according to claim 1, wherein the power supply circuit component is mounted on one surface side on which the light emitting diode is mounted, and an opaque material is provided between the cover and the power supply circuit component. Instruments.

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