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US 9,175,812 B2Granted
Lighting apparatus
AssigneeLG Electronics Inc.
InventorsByungsang Jung, Sejoon You, Kyungtaek Lee, Hyunha Kim, Seoyoung Maeng, Dongchul Yoo
Life of this patent
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Abstract
A lighting apparatus can dissipate heat by conduction and convection. A heat sink is provided with an active cooling device for the lighting apparatus.
Claims17
A lighting apparatus comprising:
- a heat sink having first and second surfaces, which are opposite sides, and a plurality of fins, which extend a prescribed distance from a circumference of the heat sink, and a prescribed gap provided between adjacent fins;
- a light emitting module having at least one light emitting diode provided on the first surface of the heat sink;
- an active cooling device to dissipate heat by convection, the active cooling device having a housing mated to the fins on the second side of the heat sink and the housing having a wall thickness which is less than the prescribed distance of the fins such that vents are formed by an area difference between the fins of the heat sink and the wall thickness of the housing at a boundary between the heat sink and the housing, the active cooling device further including a diaphragm provided in the housing such that a first space is provided between the diaphragm and the heat sink and a driving module to move the diaphragm in first and second directions, which are opposite directions, wherein movement of the diaphragm in the first and second directions changes a volume of the first space causing air in the first space to be discharged through the vents formed between the adjacent fins when the diaphragm moves toward the heat sink in the first direction and suctioning air from outside into the first space when the diaphragm moves away from the heat sink in the second direction;
- an electronic module is provided in the housing of the active cooling device such that the electronic module is provided between the diaphragm and a bottom of the housing,
- wherein a second space is defined between the diaphragm and the electronic module, and the second space is in communication with the outside via at least one opening formed in the housing, and
- wherein a slope portion is provided in the circumference of the heat sink to deflect the air discharged through the vents between the heat sink and the housing, and the slope portion is oblique downwardly toward the housing,
- wherein a plurality of projections are provided on the housing to form a vent for suction and discharge of air via a boundary between the heat sink and the housing, and
- wherein the driving module includes a coil provided on the diaphragm and a magnet provided on the housing, the coil is provided on a lower surface of the diaphragm facing the magnet, and a cable connected with the driving module is electrically connected with a pad on an upper surface of the diaphragm.
5 more elements
A lighting apparatus comprising:
- a heat sink having first and second surfaces, which are opposite sides, and a plurality of fins, which extend a prescribed distance from a circumference of the heat sink, and a prescribed gap provided between adjacent fins;
- a light emitting module having at least one light emitting diode provided on the first surface of the heat sink;
- an active cooling device to dissipate heat by convection, the active cooling device having a housing mated to the fins on the second side of the heat sink and the housing having a wall thickness which is less than the prescribed distance of the fins such that vents are formed by an area difference between the fins of the heat sink and the wall thickness of the housing at a boundary between the heat sink and the housing, the active cooling device further including a diaphragm provided in the housing such that a first space is provided between the diaphragm and the heat sink and a driving module to move the diaphragm in first and second directions, which are opposite directions, wherein movement of the diaphragm in the first and second directions changes a volume of the first space causing air in the first space to be discharged through the vents formed between the adjacent fins when the diaphragm moves toward the heat sink in the first direction and suctioning air from outside into the first space when the diaphragm moves away from the heat sink in the second direction;
- an electronic module is provided in the housing of the active cooling device such that the electronic module is provided between the diaphragm and a bottom of the housing,
- wherein a second space is defined between the diaphragm and the electronic module, and the second space is in communication with the outside via at least one opening formed in the housing, and
- wherein a slope portion is provided in the circumference of the heat sink to deflect the air discharged through the vents between the heat sink and the housing, and the slope portion is oblique downwardly toward the housing,
- wherein a plurality of projections are provided on the housing to form a vent for suction and discharge of air via a boundary between the heat sink and the housing, and
- wherein the driving module includes a coil provided on a solid region of the diaphragm and a magnet provided on an inside of the housing, the coil is provided on a lower surface of the solid region of the diaphragm facing the magnet, and a cable connected with the driving module is electrically connected with a pad on an upper surface of the diaphragm,
- wherein the solid region of the diaphragm to move close to and away from the magnet based on an electromagnetic force between the coil and the magnet, and a flexible region of the diagram allows movement of the solid region of the diagram toward and away from the magnet based on changing magnetic field caused by alternate current flow when an alternating voltage is applied to the coil.
6 more elements
Dependencies are inferred from the claim text.