1. Technical Field
The present disclosure relates to LED illumination devices, especially to a conduction structure of an LED illumination device.
2. Description of Related Art
An LED illumination device often includes a lamp panel with a number of LEDs and a circuit board. The lamp panel is grounded by being connected to the circuit board by a wire. A shell of the LED illumination device is often transparent. Thus, the wire is visible from outside, which negatively impacts the appearance of the LED illumination device.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
Referring to
The circuit board 60 defines a number of second through holes 62 aligning with the corresponding first through holes 48. Referring to
The support 20 includes a brim 21 and a body 23. The brim 21 of the support 20 defines a number of openings 22 configured for receiving the base portions 42. A fixing bar 24 is formed between each two adjacent openings 22. Each fixing bar 24 includes a protruding post 26 defining a hole 28. A bolt 50 extends through the second through hole 60 and the first through hole 48 and is screwed into the hole 28, to fix the cooling plate 40 and the circuit board 60 to the support 20. The first conductive area 43 contacts the second conductive area 64, thereby the cooling plate 40 is electrically connected to the circuit board 60.
The lamp panel 80 defines a number of second holes 82. The first holes 46 and the second holes 82 are both threaded holes. The bolts 90 are screwed into the second hole 82 and the first hole 46 in a transitional fit manner, to fix the lamp panel 80 to the cooling plate 40. Referring to
As each bolt 90 is screwed into the corresponding the first hole 46 and the second hole 82, thread of the bolt 90 breaks the anticathode oxidation film of the inner surface of the first hole 46, causing an inner surface of the first hole 46 to be electrically conductive. A head 92 of the bolt 90 contacts the third conductive area 84. A rod 94 of the bolt 90 contacts the inner surface of the first hole 46. When the LED illumination device 10 works, the lamp panel 80 is electrically connected to the bolt 90 by the head 92 contacting the third conductive area 84, and the bolt 90 is electrically connected to the cooling plate 40 by the rod 94 contacting the first hole 46. The lamp panel 80 is thus electrically connected to the cooling plate 40. Because the cooling plate 40 is electrically connected to the circuit board 60, the lamp panel 80 is able to electrically connected to the circuit board 60 by the cooling plate 40.
In an alternative embodiment, the first hole 46 and the second hole 82 may be unthreaded holes. The inner surface of the first hole 46 is not treated by anticathode oxidation. Because the cooling plate 40 can be made of aluminum, the inner surface of the first hole 46 is conductive. The bolt 90 is replaced by a conductive member, which includes a head and a rod. The head contacts the third conductive area 84. The rod engages in the first hole 46 and the second hole 82 in a transition fit manner to contact the inner surface of the first hole 46.
In an alternative embodiment, the surface of the cooling plate 40 may be left untreated by anticathode oxidation. The cooling plate 40 can directly contact the first conductive area 43 of the circuit board 60.
The lamp panel 80 is electrically connected to the circuit board 89 of the LED illumination device 10 by treating the surface of the cooling plate 40, the circuit board 60, and the lamp panel 80, which will not have a negative influence on the appearance of the LED illumination device 10.
It is to be understood, however, that even though numerous characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the present disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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2010 1 0279651 | Sep 2010 | CN | national |
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20080158887 | Zhu et al. | Jul 2008 | A1 |
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Number | Date | Country | |
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20120062096 A1 | Mar 2012 | US |