1. Technical Field
The present disclosure generally relates to illuminating apparatus, and particularly to a light-emitting diode lamp having an improved adaptability.
2. Description of Related Art
light-emitting diodes (LEDs), available since the early 1960's and, because of their high light-emitting efficiency and long life span, have been increasingly used. According to Illuminating Engineering Society of North America (IESNA), illumination distribution of lighting used in certain locations, such as squares, sidewalks, yards, parks, or parking lots, must meet the standards of Type IV or Type V. These two types of standards require that the light illuminating on the locations has a circular or square pattern, in which the light source is located at a center of the pattern. However, light directly emitted from the LEDs usually cannot meet such a requirement. To meet the requirement, lenses capable of modulating light distribution of the LEDs may be used.
The lens is generally mounted on the LED through screw or glue and not readily to be removed from the LED. Therefore, once the lens is mounted on LED, the light distribution of the LED is fixed. Different LED lamps with different lenses may be required to meet different requirements of light distribution patterns. As a result, additional manufacturing processes and added cost may be required.
What is needed, therefore, is an LED lamp which can overcome the disadvantages as described above.
Referring to
The supporting salver 11 is elongated and substantially rectangular. The supporting salver 11 comprises a supporting plate 111 and an annular sidewall 112 extending upwardly from an edge of the supporting plate 111. An annular receiving slot 113 is defined in a top of the sidewall 112. The supporting plate 111 comprises a first surface 1111 and a second surface 1112 opposite to each other. The sidewall 112 is formed on the first surface 1111 and encircling the plurality of LEDs 12. A plurality of heat dissipation members 115 extend downwardly from the second surface 1112 of the supporting plate 111. The supporting plate 111 defines a plurality of first recesses 114 in two opposite edges of the second surface 1112. Each of the plurality of first recesses 114 is strip-shaped along the edge of the second surface 1112.
The plurality of LEDs 12 are arranged on the first surface 1111 of the supporting plate 111 in array via a printed circuit board. Heat generating by each of the plurality of LEDs 12 is transferred to the supporting plate 111 and dissipated through the plurality of heat dissipating members 115. In this embodiment, the plurality of LEDs 12 are arranged in two rows along a length direction of the supporting salver 11.
The lampshade 13 is substantially rectangular. A shape of the lampshade 13 matches that of the supporting plate 111. The lampshade 13 comprises a rectangular main body 131, an optic portion 132 at a middle portion of the main body 131 and an annular flange 133 formed at an edge of the main body 131. The main body 131 defines a plurality of ventilation holes 136 in two opposite end portions thereof. The plurality of ventilation holes 136 runs through the main body 131 for heat dissipation and ventilation. The lampshade 13 further defines a plurality of second recesses 134 in two opposite edges of a top surface corresponding to the plurality of first recesses 114 of the supporting salver 11. Each of the plurality of second recesses 134 of the lampshade 13 is strip-shaped and aligned with each of the plurality of first recesses 114 of the supporting salver 11. The lampshade 13 also acts as a dustproof cover for the plurality of LEDs 12.
Each of the plurality of clips 14 is substantially C-shaped and formed through bending a metal strip integrally. In other embodiment, the clip can be made in resilient plastic materials, such as polyvinyl chloride (PVC), et al. Each of the plurality of clips 14 comprises a curved connecting portion 141 and two buckling portions 142 formed at two opposite ends of the connecting portion 141. Each of the two buckling portions 142 is V-shaped. The two buckling portions 142 face each other with their pointed portions. A distance between the two bucking portions 142 is less than a sum of thicknesses of the supporting salver 11 and the lampshade 13 when the plurality of clips are 14 in natural states without deformation. The connecting portion 141 and the two buckling portions 142 are resilient. The distance between the two buckling portions 142 is adjustable via resilient deformation of the connecting portion 141.
Referring to
Each of the plurality of lenses 135 comprises a light receiving surface 1351 and a light output surface 1352 opposite to each other. Light emitted by the plurality of LEDs 12 radiates into the plurality of lens 135 through the light receiving surface 1351 and radiates out of the plurality of lens 135 through the light output surface 1352. The light of the plurality of LEDs 12 is refracted at the light output surface 1352, and thus the light distribution of the plurality of LEDs 12 is changed. The light receiving surface 1351 is flat and positioned at the level adjacent to a bottom surface of the optic portion 132. The light-output surface 1352 protrudes out of a top surface of the optic portion 132 convexly. A maximum thickness of each of the plurality of lens 135 between the light receiving surface 1351 and the light output surface 1352 is half as a height of the flange 133. An orthographic projection of the plurality of lens 135 on the supporting plate 111 is substantially elliptical. Cross sections of the plurality of lens 135 respectively along length and width directions thereof are both arch-shaped.
In assembly of the LED lamp 10, the lampshade 13 is placed on the supporting salver 11 with the flange 133 thereof received in the receiving slot 113. By this stage, each of the plurality of second recesses 134 of the lampshade 13 is aligned with each of the plurality of first recesses 114 of the supporting salver 11. Each of the plurality of clips 14 is pushed towards the lampshade 13 and the supporting salver 11 from a lateral side of the lampshade 13 and the supporting salver 11 until one of the two buckling portions 142 of each of the plurality of clips 14 is received in each of the plurality of first recesses 114 of the supporting salver 11 and the other one of the two buckling portion 142 is received in corresponding one of the plurality of second recesses 134 of the lampshade 13, thus mounting the supporting salver 11 and the lampshade 13 with each other in a dismountable way. Since the connecting portion 141 and the two buckling portions 142 are resilient, the plurality of clips 14 can be easily pulled out of the pluralities of first and second recesses 114, 134 of the supporting salver 11 and the lampshade 13, thus detaching the lampshade 13 and the supporting salver 11 from each other. This facilitates replacement of the lampshade 13.
In the aforementioned embodiment, since the lampshade 13, 23, 33, 43, 53 are mounted on the supporting salver 11 in a dismountable way through the plurality of clips 14 and each of the lampshade 13, 23, 33, 43, 53 has a different optic portion 132, 232, 332, 432, 532, the LED lamp 10 can change different lampshades 13, 23, 33, 43, 53 conveniently to generate different light distributions to meet different light distribution requirements without redesigns of the LED lamp. Therefore, waste is avoided.
It is to be understood, however, that even though numerous characteristics and advantages of the exemplary 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 that changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the embodiments 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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100128313 | Aug 2011 | TW | national |