Patent Application
20070070624
1. Technical Field
The present invention relates generally to light-emitting devices, and more particularly to a light emitting diode (LED) assembly, and a light source device using the LED assembly.
2. Discussion of Related Art
In the field of illumination of light source, LEDs are being increasingly used instead of conventional incandescent bulbs, since LEDs have a longer service life, a better efficiency in the converting of electrical energy in the visible spectral range and, connected therewith, a lower heat emission and a lower space requirement overall.
Because of the lower luminance of an individual LED compared with an incandescent bulb, a plurality of LEDs shaped to form an arrangement must be constructed.
Referring to
However, it is difficult to construct the LED arrangement 100 with uniform luminous intensity distribution, and the luminous area of LEDs 112 has large overlap section due to limited area between LEDs 112, so that not every LED 112 is used sufficiently.
What is needed, therefore, is to provide an LED arrangement having uniform luminous intensity distribution in each direction, and a light source device with LED arrangement having uniform luminous intensity distribution.
A preferred embodiment of the invention provides a light emitting diode assembly includes a supporter and many light emitting diodes. The supporter having a light emitting diode region, the light emitting diode region defining a plurality of concentric circles with radiuses Rn thereof satisfying the equation: Rn=n×r, where r represents a radius of the smallest circle, and n represents a sequence number of the circles in order from the smallest circle to the largest circle. The light emitting diodes are arranged in the light emitting diode region of the supporter, wherein, a number of light emitting diodes m are arranged in the smallest circle of the light emitting diode region of the supporter, and a number of light emitting diodes equaling (2n−1)×m are arranged in a circular region bounded by the circle number (n−1) and the circle number n of the supporter.
Another preferred embodiment of the invention provides a light source device, the light source device including a housing and a light emitting diode assembly received in the housing. The light emitting diode assembly including: a supporter having a light emitting diode region, the light emitting diode region defining a plurality of concentric circles with radiuses Rn thereof satisfying the equation: Rn=n×r, where r represents a radius of the smallest circle, and n represents a sequence number of the circles in order from the smallest circle to the largest circle, and a plurality of light emitting diodes arranged in the light emitting diode region of the supporter, wherein, a number of light emitting diodes m are arranged in the smallest circle of the light emitting diode region of the supporter, and a number of light emitting diodes (2n−1)×m are arranged in a circular region bounded by the circle number (n−1) and the circle number n of the supporter.
Other advantages and novel features will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The components in the drawings are not necessarily to scale, the emphasis instead being placed upon clearly illustrating the principles of the present light emitting diode assembly and light emitting device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
The present light emitting diode assembly generally includes a supporter and a plurality of light emitting diodes. The supporter having a light emitting diode region, the light emitting diode region defining a plurality of concentric circles with radiuses Rn thereof satisfying the equation: Rn=n×r, where r represents a radius of the smallest circle, and n represents a sequence number of the circles in order from the smallest circle to the largest circle. The light emitting diodes are arranged in the light emitting diode region of the supporter, wherein, a number of light emitting diodes m are arranged in the smallest circle of the light emitting diode region of the supporter, and a number of light emitting diodes (2n−1)×m are arranged in a circular region bounded by the circle number (n−1) and the circle number n of the supporter.
The following is an elucidation about light emitting diode assembly structure for comprehending how the light emitting diodes are located evenly.
The supporter has a light emitting diode region which defines a plurality of concentric circles with radiuses Rn thereof satisfying the equation: Rn=n×r, where r represents a radius of the smallest circle, and n represents a sequence number of the circles in order from the smallest circle to the largest circle.
Radiuses of the concentric circles are individually defined as r, 2r, 3r, . . . (n−1)r, nr from the smallest circle to the largest circle.
The area S1 surrounded by the smallest circle is:
S1=π×r2 (1)
The area S2 surrounded by the second circle is:
S2=π×(2r)2 (2)
The area S3 surrounded by the third circle is:
S3=π×(3r)2 (3)
The area S(n−1) surrounded by the (n−1) circle is:
S(n−1)=π×[(n−1)r]2 (4)
The area Sn surrounded by the n circle is:
Sn=π×(nr)2 (5)
According to formulas (1) and (2), the area of a first annulus S12 surrounded by the smallest circle and the second circle is:
S12=S2−S1=3×π×r2 (6)
According to formulas (2) and (3), the area of a second annulus S23 surrounded by the second circle and the third circle is:
S23=S3−S2=5×π×r2 (7)
According to formulas (4) and (5), the area of a (n−1) annulus S(n−1)n surrounded by the (n−1) circle and the n circle is:
S(n−1)n=Sn−S(n−1)=(2n−1)×π×r2 (8)
And the circular area surrounded by the smallest circle is carved up with a number of sub-areas m following the radial direction, a light emitting diode is arranged in one sub-areas, so according to formula (1), the area of sub-area Si is:
Si=S1/m=π×r2/m (9)
According to formulas (6) and (9), the first annulus having a number of sub-areas in circular direction m1, area of the sub-area is Si, wherein m1 is:
m1=S12/Si=5×m (10)
According to formulas (7) and (9), the second annulus having a number of sub-areas in circular direction m2, area of the sub-area is Si, wherein m2 is:
m2=S23/Si=5×m (11)
According to formulas (8) and (9), the (n−1) annulus having a number of sub-area in a circular direction m(n−1), area of the sub-area is Si, wherein m(n−1) is:
m(n−1)=S(n−1)n/Si=(2n−1)×m (12)
According to formulas (9), (10), (11), and (12), the light emitting diode assembly having a number of sub-areas in a circular direction mj, area of the sub-area is Si, wherein mj is:
mj=m+m1+m2+ . . . +m(n−1)=m×n2 (13)
Referring to description above, a number of m×n2 light emitting diodes is arranged in the light emitting diode region of the supporter. A number of light emitting diodes m is arranged in the smallest circle of the light emitting diode region of the supporter, a number of light emitting diodes (2n−1)×m are arranged in a circular region bounded by the circle number (n−1) and the circle number n of the supporter.
Reference will now be made to the drawings to describe embodiments of the present light emitting diode assembly.
Referring to
The supporter 227 has a first circle 222 and a second circle 224. A point 221 acts as the centre of the first circle 222 and the second circle 224. The radius of the first circle 222 is r, the area surrounded by the first circle 222 is π×r2; the radius of the second circle 224 is 2r, the area surrounded by the second circle 224 is 4×π×r2, the area of annulus surrounded by the first circle 222 and the second circle 224 is 3×π×r2. An LED 299 is placed on the point 221 and three LEDs 299 are equidistantly arranged in the annulus area, at the same time, three LEDs 299 are spaced from each of adjacent circles thereof at a same distance. As a result of this the light emitting diode assembly 220 has uniform luminous intensity distribution in each direction.
Referring to
The supporter 337 has a first circle 332, a second circle 334 and a third circle 336. A point 331 acts as the centre of the first circle 332, the second circle 334 and the third circle 336. The radius of the first circle 332 is r, the area surrounded by the first circle 332 is π×r2; the radius of the second circle 334 is 2r, the area surrounded by the second circle 334 is 4×π×r2; the radius of the third circle 336 is 3r, the area surrounded by the third circle 336 is 9×π×r2; the area of annulus surrounded by the first circle 332 and the second circle 334 is 3×π×r2; the area of annulus surrounded by the second circle 334 and the third circle 336 is 5×π×r2. Two LEDs 339 are arranged evenly in the circular region surrounded by the first circle 332; six LEDs 339 are equidistantly arranged evenly in the annulus area surrounded by the first circle 332 and the second circle 334, at the same time, ten LEDs 339 are equidistantly arranged in the annulus area surrounded by the second circle 334 and the third circle 336, LEDs 399 are spaced from each of adjacent circles thereof by a same distance. As a result of this the light emitting diode arrangement 330 has uniform luminous intensity distribution in each direction.
Referring to
It is understood that the various above-described embodiments and methods are intended to illustrate rather than limit the invention. Variations may be made to the embodiments and methods without departing from the spirit of the invention. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200510037489.0 | Sep 2005 | CN | national |
