TWI391608B - Illuminating apparatus - Google Patents

Description

Lighting device

The invention relates to a lighting device.

At present, Light Emitting Diode (LED) has been widely used in many fields, especially in the field of street lamps. See, for example, Daniel A. Steigerwald et al., IEEE Journal on Selected Topics in Quantum Electronics, Vol. 8, No. 2, March/April 2002, Illumination With Solid State Lighting Technology.

Light-emitting diodes are generally used to emit light of a specific wavelength, such as visible light, but the energy received by the light-emitting diodes, about 80-90% of which is converted into heat, and the rest of the energy is actually converted into light energy. Since the temperature of the light-emitting diode is gradually increased when the light-emitting diode is illuminated, when the temperature reaches a certain level, the working voltage, the wavelength of the light, and the intensity of the light output are greatly affected. Therefore, the heat generated by the illuminating diode must be evacuated to ensure the normal operation of the illuminating diode.

A lighting device with higher heat dissipation efficiency will be described below by way of example.

A lighting device includes: a lighting module, a cover plate and a casing. The light emitting module has a light emitting surface. The cover plate includes a first surface and a second surface opposite to the first surface, the cover plate has a plurality of heat dissipation through holes penetrating the first surface and the second surface, and a plurality of Retaining wall on the second surface of the cover, each retaining wall pair One of the heat dissipation through holes is disposed, and the cover wall surrounds an opening formed on the second surface of the heat dissipation through hole corresponding thereto, and the cover plate is disposed on a side of the light emitting module away from the light emitting surface, and the cover The first surface of the board is opposite the light emitting module. The cover includes a top plate and a side wall connected to the top plate, the top plate and the side wall enclose a cavity, the top plate of the case has a plurality of ventilation through holes, the cover plate is received in the cavity, and the cover plate The second surface is opposite to the top plate, and the plurality of heat dissipation through holes on the cover plate are alternately distributed with the plurality of ventilation through holes on the top plate, wherein the light emitting module is located on a side of the housing away from the top plate, and the The light emitting module is connected to the sidewall.

Compared with the prior art, the heat generated by the illumination module of the illumination device can be quickly transmitted to the outside through the heat dissipation through hole and the ventilation through hole, and exchange heat with the outside air, thereby effectively dissipating heat from the illumination module. At the same time, the heat dissipation through hole and the ventilation through hole are mutually offset, and each of the heat dissipation through holes has a retaining wall, and external dust, raindrops or other impurities fall to the second surface of the cover through the ventilation through hole, and The heat dissipation through hole does not reach the light emitting module, thereby affecting the normal operation of the light emitting module.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , an illumination device 100 according to an embodiment of the present invention includes a light emitting module 10 , a cover 20 , and a housing 30 .

Referring to FIG. 2 , the light emitting module 10 includes a substrate 101 and a plurality of light emitting units 102 . The substrate 101 has a first surface 1011 and a second surface 1012 opposite to the first surface 1011. The plurality of light emitting sheets The element 102 is disposed on the first surface 1011, and the light emitted by the plurality of light emitting units 102 is emitted from the first surface 1011 and away from the second surface 1012. The plurality of light emitting units 102 can be a light emitting diode chip, a light emitting diode module, or other solid state light emitting elements.

Referring to FIGS. 2 and 3, the cover 20 includes a first surface 201 and a second surface 202 opposite the first surface 201. The first surface 201 is a plane, and the second surface 202 is a columnar convex curved surface. The cover plate 20 is provided with a plurality of cylindrical heat dissipation through holes 203 arranged in a matrix and extending through the first surface 201 and the second surface 202. The heat dissipation through holes 203 form an opening on the second surface 202. . A plurality of retaining walls 204 are disposed on the second surface 202 of the cover plate 20, and each of the retaining walls 204 corresponds to a heat dissipation through hole 203, and the retaining wall 204 surrounds the corresponding heat radiating through hole 203 on the second surface. An opening formed in 202. The cover plate 20 can be made of a thermally conductive material to enhance heat transfer.

In order to enhance the heat dissipation effect, a plurality of heat dissipation fins 205 are disposed on the cover plate 20, and the plurality of heat dissipation fins 205 extend along the first direction A, and the length L1 of each of the heat dissipation fins 205 is smaller than the cover plate. 20 width L2.

It can be understood that when the second surface 202 of the cover plate 20 is a convex spherical surface, the plurality of heat dissipation fins 205 disposed on the cover plate 20 are not limited to the above-mentioned extending direction, but can extend along other directions. . Therefore, the extending direction of the plurality of heat dissipating fins 205 disposed on the cover plate 20 is changed according to the curved surface structure of the second surface 202 of the cover plate 20, and only the length L1 of each of the heat dissipating fins 205 is required to be smaller than The cover 20 has a width L2. The housing 30 includes a top plate 301 and a plurality of side walls 302 connected to the top plate 301. The top plate 301 and the plurality of side walls 302 define a cavity 303. The top plate 301 A plurality of cylindrical ventilation through holes 304 are provided, and the plurality of ventilation through holes 304 are arranged in a matrix. A plurality of rectangular side through holes 305 are disposed on the plurality of side walls 302.

The cover plate 20 is received in the cavity 303, and the second surface 202 of the cover plate 20 is disposed opposite to the top plate 301. The first surface 201 of the cover plate 20 is opposite to the second surface 1012 of the substrate 101, and the second surface 1012 of the substrate 101 is connected to the sidewall 302.

The plurality of ventilation through holes 304 are alternately distributed with the plurality of heat dissipation through holes 203. Specifically, the projection of the plurality of ventilation through holes 304 on the cover plate 20 does not intersect the projection of the plurality of heat dissipation through holes 203 on the cover plate 20. Each of the side through holes 305 is connected to the second surface 202 of the cover plate 20.

The heat generated by the light-emitting module 10 during operation is transmitted to the first surface 201 of the cover plate 20. The cold air of the outside reaches the second surface 202 of the cover plate 20 through the plurality of ventilation through holes 304, and the hot and cold air is borrowed. Heat exchange is performed by the plurality of heat dissipation through holes 203 to achieve heat dissipation of the light emitting module 10. The plurality of heat dissipation fins 205 disposed on the second surface 202 of the cover plate 20 can accelerate the flow of air, so that the heat accumulated on the cover plate 20 is quickly transmitted to the outside through the plurality of heat dissipation through holes 203. To enhance the heat dissipation effect of the light emitting module 10.

When the light-emitting module 10 is in operation, external dust, raindrops or other impurities reach the second surface 202 of the cover plate 20 through the plurality of ventilation through holes 304, but the plurality of heat dissipation holes are communicated with the plurality of heat dissipation holes 304 The holes 203 are respectively arranged in a staggered manner, and each of the heat dissipation through holes 203 has a corresponding retaining wall 204, so that dust, raindrops or other impurities from the outside are not caused by the plural The heat dissipation through holes 203 reach the light emitting module 10.

At the same time, since the second surface 202 of the cover plate 20 is a convex curved surface, and the second surface 202 is connected to the plurality of side through holes 305, the ventilation through hole 304 enters and falls to the cover plate. The dust, raindrops or other impurities of the second surface 202 flow along the convex curved surface toward the periphery of the cover plate 20 along the convex surface, and are discharged in time through the plurality of side through holes 305 without accumulating in the surface. The second surface 202 of the cover 20 reaches the light emitting module 10 through the heat dissipation through hole 203, thereby effectively protecting the light emitting module 10.

It can be understood that, in this embodiment, the plurality of heat dissipation through holes 203, the plurality of ventilation through holes 304, and the plurality of side through holes 305 may be other shapes and/or other arrangements, as the case may be. set.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Lighting device

10‧‧‧Lighting module

20‧‧‧ Cover

30‧‧‧Shell

101‧‧‧Substrate

102‧‧‧Lighting unit

1011, 201‧‧‧ first surface

1012, 202‧‧‧ second surface

203‧‧‧Solution through hole

204‧‧‧Retaining wall

205‧‧‧heat fins

301‧‧‧ top board

302‧‧‧ side wall

303‧‧‧ cavity

304‧‧‧Ventilation through hole

305‧‧‧ side through hole

FIG. 1 is a schematic perspective view of a lighting device according to an embodiment of the invention.

2 is an exploded view of the lighting device of FIG. 1.

Figure 3 is a schematic cross-sectional view taken along line III-III of Figure 1.

100‧‧‧Lighting device

10‧‧‧Lighting module

20‧‧‧ Cover

30‧‧‧Shell

101‧‧‧Substrate

102‧‧‧Lighting unit

1011, 201‧‧‧ first surface

1012, 202‧‧‧ second surface

204‧‧‧Retaining wall

205‧‧‧heat fins

301‧‧‧ top board

302‧‧‧ side wall

304‧‧‧Ventilation through hole

305‧‧‧ side through hole

Claims (9)

A lighting device includes: a light emitting module having a light emitting surface; a cover plate including a first surface and a second surface opposite the first surface, the cover plate The upper surface has a plurality of heat dissipation through holes penetrating the first surface and the second surface, and a plurality of retaining walls disposed on the second surface of the cover plate, each of the retaining walls corresponding to the heat dissipation through hole, and the block An opening formed on the second surface of the heat dissipation through hole corresponding to the wall, the cover plate is disposed on a side of the light emitting module away from the light emitting surface, and the first surface of the cover plate and the light emitting module a casing comprising a top plate and a side wall connected to the top plate, the top plate and the side wall surrounding a cavity, the top plate having a plurality of ventilation through holes, the cover plate being received in the cavity, and the cover The second surface of the plate is opposite to the top plate, and the plurality of heat dissipation through holes on the cover plate are alternately distributed with the plurality of ventilation through holes on the top plate, wherein the light emitting module is located on a side of the case away from the top plate, and The light emitting module and the side Connected. The illuminating device of claim 1, wherein the second surface of the cover is a convex curved surface. The lighting device of claim 1, wherein the cover plate is made of a heat conductive material. The lighting device of claim 1, wherein the plurality of heat dissipation through holes are arranged in a matrix. The lighting device of claim 1, wherein the plurality of ventilation through holes are arranged in a matrix. The lighting device of claim 1, wherein the housing The side wall has a plurality of side through holes, and each of the side through holes is connected to the second surface of the cover plate for discharging the liquid accumulated on the second surface of the cover plate. The illuminating device of claim 1, wherein the illuminating module comprises a substrate and at least one illuminating unit disposed on the substrate, and the surface of the at least one illuminating unit disposed on the substrate is a illuminating surface. The illuminating device of claim 7, wherein the illuminating unit is a plurality of illuminating diodes. The illuminating device of claim 1, wherein the second surface of the cover is provided with fins.