Patent Grant
9897278
This application claims priority to Chinese Patent Application No. 201410442548.1 filed on Sep. 2, 2014, the contents of which are incorporated by reference herein.
The subject matter herein generally relates to a reflector, especially also relates to a light emitting diode illumination device having the reflector.
Light emitting diodes (LEDs) have been used widely in the illumination field because of the high efficiency, energy saving, and long life cycle thereof. Light emitted from the LED is projected around an axis of the LED. LED devices often are implemented in arrays of multiple LEDs in a single fixture.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. The description is not to be considered as limiting the scope of the embodiments described herein.
Several definitions that apply throughout this disclosure will now be presented. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like.
Referring to
Each reflector 10 defines a groove 15 therein. The LEDs 20 are received in the groove 15. Light emitted from the LED 20 is reflected by an inner surface of the reflector 10 and to be projected towards the table 2. A projecting direction of the light is contrary with a direction of the light emitted from the LEDs 20.
A cross section of the reflector 10 is L-shaped. Each reflector 10 includes a first reflecting plate 11, a second reflecting plate 12 and a third reflecting plate 13. The third reflecting plate 13 is configured above and relatively to the first reflecting plate 11. The second reflecting plate 12 connects the first reflecting plate 11 and the third reflecting plate 13. Specifically, the first reflecting plate 11, the second reflecting plate 12 and the third reflecting plate 13 cooperatively defines the groove 15. A side of the reflector 10 has an opening 14 relative to the second reflecting plate 12 such that the groove 15 directly contacts with external by the opening 14.
In at least one embodiment, a top surface of the first reflecting plate 11 and the third reflecting plate 13 are configured parallelly to a top surface 201 of the table 2, and both sides surface of the second reflecting plate 12 configured vertically with the top surface 201 of the table 2. A length of the third reflecting plate 13 is more than that of the first reflector plate 11. Left ends of first reflecting plate 11 and the third reflecting plate 13 are coplanar. The second reflecting plate 12 connects the left ends of the first reflecting plate 11 and the third reflecting plate 13. A right end of the third reflecting plate 13 is beyond a right end of the first reflecting plate 11. The reflector 10 is made of thermal conductive material, such as aluminum, or cooper.
The LEDs 20 are mounted on the top surface the first reflecting plate 11 and spaced from the third reflecting plate 13. Light emitted From the LEDs 20 is reflected by the first reflecting plate 11 and the third reflecting plate 13 to exit through the opening 14. In this embodiment, the LEDs 20 includes a plurality of white LEDs arranged in series near the opening 14. In other embodiment, the LEDs 20 includes a red LED, a green LED and a blue LED to mix to be white light in the groove 15.
Also referring to
Because the reflector 10 has the width equal to the table 2, the length of the reflector 10 is not changed. Only changes the length of the third reflecting plate 13 can change the area of the LED illumination device 1 projected to the table 2 to adjust the light intensity provided by the LED illumination device 1 on the table 2. Generally, the light intensity uniformity is a ratio between the lowest light intensity and the average light intensity, and has nothing with a shape of the LEDs 20 and the reflector 10. So the light intensity uniformity of the LED illumination device 1 projected to the table 2 can be adjusted by changing the length of the third reflecting plate 13.
In one embodiment, a ratio between an area of the third reflecting plate 13 projected to the table 2 and the top surface 201 of the table is defined X. The X and the light intensity uniformity have relations as following chart:
As illustrated in the chart, while the X>0.0136, the light intensity uniformity is less than 0.6. However, in order to have a great light effect, the light intensity uniformity is greater than 0.6. Therefore, a relationship can be construed as 0.0136≦x≦1.
Further referring to
A length of the first reflecting plate 11 projected to the table 2 is L1. The length of the second reflecting plate 12 is L2. A length of the third reflecting plate 13 projected to the table 2 is L3. The second reflecting plate 12 interconnects between the first reflecting plate 11 and the third reflecting plate 13. The first reflecting plate 11 and the second reflecting plate 12 form a connecting point labeled as “O”. The second reflecting plate 12 and the third reflecting plate 13 form a connecting point labeled as “P”. The third reflecting plate 13 has an end point labeled as “P3” that faces away from the connecting point “P”. The first reflecting plate 11 has an end point labeled as “P2” that faces away from the connecting point “O”. A projection of the first reflecting plate 11 along a direction paralleled with the top surface 201 of the table 2 defines a vector {right arrow over (OP2)}. The second reflecting plate 12 along an extending direction thereof defines a vector {right arrow over (OP)}. The projection of the third reflecting plate 13 along a direction paralleled with the top surface 201 of the table 2 defines a vector {right arrow over (PP1)}. “P1” is defined as an end point of the vector {right arrow over (PP1)} facing away from the connecting point “P”. The third reflecting plate 13 along an extending direction thereof defines a vector {right arrow over (PP3)}. A vector {right arrow over (PP2)} is defined from the connecting point “P” to the end point “P2”. The {right arrow over (PP3)} satisfies following relations:
The A and the V are constant, and 0≦A≦1000, 0≦V≦1. While the A is constant, the V is changed from 0 to 1 to form the trajectory of the third reflecting plate 13. An angle is defined between the {right arrow over (PP1)} and the {right arrow over (PP2)}. The {right arrow over (PP3)} is located in the angle. While the length of L1 is equal to the length of L2, the angle is 45°.
While the A is increased, the {right arrow over (PP3)} gradually moves towards the {right arrow over (PP1)}; while the A is reduced, the {right arrow over (PP3)} gradually moves towards the {right arrow over (PP2)}. For example, while the A=0, the {right arrow over (PP3)} overlaps together with the {right arrow over (PP1)}.
While the X=0.1, the relation between A and the light intensity uniformity illustrated as following chart:
As illustrated in the chart, while X=0.1, the scope of A is: 0≦A≦0.15, and the light intensity uniformity is more than 0.667.
In the present disclosure, the light emitted from the LEDs 20 is reflected by the reflector 10 or reflector 10a to be projected to the table 2. So adjusting the light intensity uniformity at the table 2 is by changing the area of the reflector 10 and the reflector 10a projected to the table 2, or by changing the shaped of the reflector 10 or the reflector 10a. So the light reflected by the reflector 10 or the reflector 10a to be projected to the table 2 has uniform light intensity.
The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a reflector and LED illumination device having the same. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes can be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above can be modified within the scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2014 1 0442548 | Aug 2015 | CN | national |
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|---|---|---|---|
| 4434453 | Campbell | Feb 1984 | A |
| 5359503 | Myodo et al. | Oct 1994 | A |
| 20110058353 | Yang | Mar 2011 | A1 |
| 20140092594 | Radl | Apr 2014 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20160061412 A1 | Mar 2016 | US |
