1. Technical Field
The disclosure generally relates to an light emitting diode (LED) lamp, and more particularly, to an LED lamp having a cover with a plurality of through holes.
2. Description of Related Art
Nowadays light emitting diodes (LEDs) are used widely in various applications for illumination. A typical LED lamp includes a base, an LED mounted on the base and a cover fixed on the base. The cover is often made of transparent material such as glass or plastic. The cover seals the LEDs within the lamp to protect the LEDs from the outside environment. However, the LEDs generate a large amount of heat during operation. The heat cannot be efficiently dissipated to the outside environment due to obstruction of the cover. Therefore, operation of the LEDs may be affected by the heat accumulated within the cover.
What is needed, therefore, is an LED lamp with a cover having through holes which can address the shortcomings as described above.
Many aspects of the present 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 present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the various views.
Referring to
Also referring to
The light source 40 includes a circuit board 44 and an LED (light emitting diode) 42 mounted on the circuit board 44. The circuit board 44 is fixed on the top face 320 of the plate 32 of the base 30. Two wires 70 extend from the drive module 60 through two circular holes 324 to connect the circuit board 44. The LED 42 can be activated by the drive module 60 to emit light.
The cover 50 is made of metal such as aluminum, copper or an alloy thereof. The cover 50 includes a housing 52 and a flange 54 formed on a bottom of the housing 52. An upper portion of the housing 52 is hemispherical, and a lower portion of the housing 52 is conical, whereby the housing 52 has a bulb-shaped configuration. The lower portion of the housing 52 gradually shrinks from the upper portion towards the flange 54. A reflective film (not visible) may be formed on an inner face of the cover 50. A plurality of circular through holes 520 are uniformly defined in the housing 52. The through holes 520 are arranged in multiple rows along a top-to-bottom direction of the housing 52. A number of the through holes 520 firstly increases and then decreases from a top row towards a bottom row of the through holes 520. The through holes 520 are nearly arranged at the whole housing 52 except a part neighboring the bottom of the housing 52. The flange 54 extends downwardly from the bottom of the housing 52. The flange 54 has an inner diameter larger than the outer diameter of the sleeve 34, and less than an outer diameter of the protrusion 38. The cover 50 is assembled to the base 30 in a manner that a bottom of the flange 54 contacts the top face 380 of the protrusion 38, and an inner circumferential face of the flange 54 interferingly abuts against the outer circumferential face of the sleeve 34. In other words, the cover 50 is fixed to the base 30 by an interferential engagement therebetween. Thus, the cover 50 can be conveniently assembled to the base 30 by inserting the base 30 to the cover 50, and detached from the base 30 by pulling the base 30 out of the cover 50.
After the cover 50 is assembled to the base 30, the LED 42 is located at a position higher than the bottom row of the through holes 520, and flush with the row of the through holes 520 just above and neighboring the bottom row of the through holes 520. Thus, the LED 42 is visible from the penultimate row of the through holes 520 of the cover 50. However, as shown in
When the LED 42 is activated to emit light, heat is also generated. Since the through holes 520 are defined in the cover 50, heat can be directly connected to the outside environment through the through holes 520. Furthermore, heat can also be conducted to the base 30, which further dissipates the heat to the outside environment. In addition, the metal cover 50 also efficiently assists the base 30 to dissipate heat to the outside environment due to a high heat conductivity thereof. Thus, the heat generated by the LED 42 can be rapidly and sufficiently removed from the LED lamp 10, and normal operation of the LED lamp 10 is ensured.
The head 20 can match with a typical bulb socket. The head 20 can be an E27 male screw base. The head 20 includes a wall 22, a connection tip 24 and an insulative band 26 interconnecting the wall 22 and the connection tip 24. The wall 22 and the connection tip 24 are both made of electrically conductive material such as metal. The wall 22 forms an inner thread 220 on an inner circumferential face thereof. The wall 22 is mounted on the ring 36 of the base 30 by interferingly engaging the inner thread 220 thereof with the outer thread 360 of the ring 36. The insulative band 26 surrounds the connection tip 24. A wire 70 connects the wall 22 with the drive module 60, and another wire 70 connects the connection tip 24 with the drive module 70. Thus, the drive module 60 is electrically connected to the head 20. Power from the typical bulb socket can be delivered to the drive module 60 via the head 20.
It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the 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 invention 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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2013 1 00973853 | Mar 2013 | CN | national |
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20140292182 A1 | Oct 2014 | US |