Back to results
US 7,682,048 B2Granted
Lighting emitting diode lamp
AssigneeFoxsemicon Integrated Technology, Inc.
InventorsHung-Kuang Hsu, Chun-Wei Wang, Wen-Jang Jiang
Life of this patent
Estimating the term…
Abstract
A lighting emitting diode (LED) lamp (100) includes a first LED array (60) and a second LED array (50). A rate of change of a relatively luminous intensity relative to the temperature of the first LED array is lower than that of the second LED array. A first heat sink (10) thermally attaches to the first LED array. A second heat sink (20) thermally attaches to the second LED array. A heat dissipation efficiency of the second heat sink is higher than that of the first heat sink. The heat dissipation of the second LED array is much quicker than that of the first LED array. The second LED array thus can be kept working at a much lower temperature.
Claims17
A light emitting diode lamp, comprising:
- a circuit board which has a first surface and a second surface at opposite sides thereof, the first surface facing a first direction, the second surface facing a second direction substantially opposite to the first direction;
- a first light emitting diode array and a second light emitting diode array being arranged on the first surface of the circuit board in a juxtaposed manner, the first and second light emitting diode arrays electrically connected with and thermally attached to the first surface of the circuit board,
- a ratio of change of luminous intensity relative to change of temperature of the first light emitting diode array being less than that of the second light emitting diode array;
- a first heat sink thermally attached to the second surface of the circuit board and positioned corresponding to the first light emitting diode array;
- and
- a second heat sink thermally attached to the second surface of the circuit board and positioned corresponding to the second light emitting diode array, the first and second heat sinks being juxtaposed at the second surface of the circuit board, a heat dissipation efficiency of the second heat sink being greater than that of the first heat sink.
3 more elements
A light emitting diode lamp, comprising:
- a circuit board which has a first side and an opposite second side, the first and second sides facing away from each other;
- first and second light emitting diode arrays electrically connected with and thermally attached to the first side of the circuit board, the first and second light emitting diode arrays being arranged on the first side of the circuit board in a juxtaposed manner, a ratio of change of luminous intensity relative to change of temperature of the first light emitting diode array being less than that of the second light emitting diode array;
- first and second heat sinks thermally attached to the second side of the circuit board, the first and second heat sinks being juxtaposed at the second side of the circuit board and positioned corresponding to the first and second light emitting diode array, respectively, the first heat sink comprising a first base thermally attached to the first light emitting diode array and a plurality of first fins extending from the first base, the second heat sink comprising a second base thermally attached to the second light emitting diode array and a plurality of second fins extending from the second base, a heat dissipation efficiency of the second heat sink being greater than that of the first heat sink.
A light emitting diode lamp, comprising:
- a circuit board which has a first side and an opposite second side, the first and second sides facing opposite directions;
- first and second light emitting diodes electrically connected with and thermally attached to the first side of the circuit board, the first light emitting diodes being arranged in a group, the second light emitting diodes being arranged in a group, the two groups of light emitting diodes being arranged on the first side of the circuit board in a juxtaposed manner, a ratio of change of luminous intensity relative to change of temperature of the first light emitting diodes being less than that of the second light emitting diodes;
- first and second heat sinks thermally attached to the second side of the circuit board, the first and second heat sinks being juxtaposed at the second side of the circuit board and located corresponding to the two groups of light emitting diodes, respectively, the first heat sink comprising a first base thermally attached to the first light emitting diodes and a plurality of first fins extending from the first base, the second heat sink comprising a second base thermally attached to the second light emitting diodes and a plurality of second fins extending from the second base, a heat dissipation efficiency of the second heat sink being greater than that of the first heat sink.
Dependencies are inferred from the claim text.