Title of Invention: INDOOR ILLUMINATING DEVICE
Abstract: 
An indoor illuminating device includes at least one lamp and a housing. The at least one lamp includes a heat sink and a light emitting portion. The housing includes opposite top wall and bottom wall. The bottom wall defines at least one opening corresponding to the at least one lamp. The heat sink is received in the housing, and the light emitting portion of the at least lamp exposes out of the housing through the at least one opening. The housing further defines a first ventilation opening and a second ventilation opening. The heat sink of the at least one lamp is disposed in an airflow path between the first and second ventilation openings.

Detailed Description: 

BACKGROUND
1. Technical Field
The present disclosure relates to illuminating devices and, particularly, to an illuminating device with good heat dissipating efficiency.
2. Description of Related Art
At present, in order to extend life and improve light emitting stability, indoor illuminating devices, such as LED lamps, usually use heat sink to improve heat dissipating efficiency thereof. However, the indoor illuminating devices are usually assembled on the ceiling or the top wall of a room, and the air near the ceiling or the top wall of the room usually flows slowly; as a result, the heat generated by the illuminating device cannot be dissipated efficiently through the heat sink, and the life of the illuminating device would be decreased and the light emitting stability would be worse.
What is needed is an indoor illuminating device which can ameliorate the problem of the prior art.



BRIEF DESCRIPTION OF THE DRAWINGS
Many aspects of the present indoor illuminating device can be better understood with reference to the accompanying drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principle of the indoor illuminating device. In the drawings, all the views are schematic.
FIG. 1 is an schematic view of an indoor illuminating device according to a first exemplary embodiment.
FIG. 2 is an exploded, schematic view of a lamp of the indoor illuminating device of FIG. 1.
FIG. 3 is an exploded, schematic view of the lamp of FIG. 2, viewed from an opposite side.
FIG. 4 is an assembled, schematic view of the lamp of FIG. 2.
FIG. 5 is a cross sectional view of a housing of the indoor illuminating device taken along line V-V of FIG. 1.
FIG. 6 is a cross sectional view of an indoor illuminating device according to a second exemplary embodiment.



DETAILED DESCRIPTION
Embodiments of the present disclosure will now be described in detail below, with reference to the accompanying drawings.
Referring to FIG. 1, an indoor illuminating device 100 according to a first exemplary embodiment is shown. The indoor illuminating device 100 includes at least one lamp 10, a housing 20, and an airflow generating device 30.
Referring to FIGS. 2 to 4, in the present embodiment, the lamp 10 includes a lamp holder 11, a driving circuit 12, a heat sink 13, and a light emitting portion 14.
The lamp holder 11 includes a securing portion 111 and an electrical connector 112. The electrical connector 112 is secured to an end of the securing portion 111, and is configured for connecting to a power source (not shown) which can supply power to the lamp 10. The securing portion 111 is configured for securing the driving circuit 12 and the heat sink 13.
The driving circuit 12 is disposed between the lamp holder 11 and the heat sink 13, and is electrically connected to the electrical connector 112 and the light emitting portion 14. The driving circuit 12 is configured for supplying driving voltage to the light emitting portion 14.
The light emitting portion 14 includes at least one light emitting component 141 and a lamp cover 142. In the present embodiment, the light emitting portion 14 includes five light emitting components 141, and the light emitting components 141 are light emitting diodes. It is understood that the number of the light emitting components 141 is not limited to the present embodiment, the number of the light emitting components 141 can also be one, two, three, etc. The lamp cover 142 is configured for protecting the light emitting components 141. The lamp cover 142 can be made of transparent material, such as glass, plastic and so on. In the present embodiment, the lamp cover 142 is hemisphere-shaped.
The heat sink 13 includes a base 131, a number of fins 132, a hollow post 133, and a number of heat dissipating posts 134.
The base 131 includes a first surface 131a facing away from the lamp holder 11 and a second surface 131b opposite to the first surface 131a. The light emitting components 141 are mounted on the first surface 131a of the base 131. A circuit board (not shown) can be placed on the first surface 131a of the base 131 first, and then, the light emitting components 141 are mounted on the circuit board; or the light emitting components 141 are directly mounted on the first surface 131a of the base 131, and are electrically connected to a circuit (not shown) formed on the first surface 131a of the base 131, wherein the circuit can be formed on the first surface 131a by plating. The base 131 can be made of thermally conductive and electrically insulating material, such as ceramics. The ceramics can be selected from a group consisting of alumina ceramics, aluminum nitride, and so on. If the light emitting components 141 are directly mounted on the first surface 131a of the base 131, the heat resistance between the light emitting components 141 and the heat sink 13 can be decreased effectively. The base 131 defines a ring-shaped assembling groove 131c surrounding the light emitting components 141 on the first surface 131a. The assembling groove 131c is used for assembling the lamp cover 142 on the heat sink 13. The base 131 further defines at least one through hole 131d running through the first surface 131a and the second surface 131b. The through hole 131d is provided for the electrical connection between the light emitting components 141 and the driving circuit 12, wherein electrical wire (not shown) electrically connecting with the light emitting components 141 extends through the through hole 131d to electrically connect with the driving circuit 12.
The heat dissipating posts 134 are formed on the first surface 131a of the base 131. The heat dissipating posts 134 are arranged surrounding the ring-shaped assembling groove 131c. 
The fins 132 and the hollow post 133 are formed on the second surface 131b of the base 131. The fins 132 are arranged surrounding the hollow post 133, and each of the fins 132 is connected to an outer surface of the hollow post 133. In the present embodiment, the fins 132, the hollow post 133, and the heat dissipating posts 134 are integrally formed with the base 131. The fins 132, the hollow post 133, the heat dissipating posts 134, and the base 131 can be made of a same material. An end of the hollow post 133 away from the base 131 is fixed to an end of the securing portion 111 away from the electrical connector 112. The driving circuit 12 can be received in the hollow post 133; thus, the volume of the lamp 10 can be decreased.
In the present embodiment, the hollow post 133 is mainly used for fixing the heat sink 13 to the lamp holder 11 and receiving the driving circuit 12 therein conveniently. It is understood, in other embodiments, the connection between the heat sink 13 and the lamp holder 11 is not limited to the present embodiment.
Referring to FIG. 5, the housing 20 includes a top wall 21, a bottom wall 22, a first sidewall 23, and a second sidewall 24. The first sidewall 23 and the second sidewall 24 are connected between the top wall 21 and the bottom wall 22.
The bottom wall 22 defines at least one opening 221. When the lamp 10 is assembled in the housing 20, the light emitting portion 14 can expose out of the housing 20 through the opening 221, while, the heat sink 13 and the lamp holder 11 of the lamp 10 are received in the housing 20. Preferably, the top wall 21 defines an assembling groove 211 corresponding to each opening 221 for securing the lamp holder 11 of the lamp 10 conveniently.
The first sidewall 23 and the second sidewall 24 define a first ventilation opening 231 and a second ventilation opening 241 respectively. The heat sink 13 of each lamp 10 is disposed in the airflow path between the first ventilation opening 231 and the second ventilation opening 241. At least one of the first ventilation opening 231 and the second ventilation opening 241 is connected to the airflow generating device 30. The airflow generating device 30 can be disposed in the first ventilation opening 231 or the second ventilation opening 241, or the airflow generating device 30 can be connected to the first ventilation opening 231 or the second ventilation opening 241 through an air guide pipe (not shown). The airflow generating device 30 is configured for increasing the air flowing speed between the first ventilation opening 231 and the second ventilation opening 241. In the present embodiment, the airflow generating device 30 is disposed in the first ventilation opening 231. In order to improve the heat dissipating efficiency of the lamp 10, preferably, the first sidewall 23 is opposite to the second sidewall 24, and the lamp 10 is disposed between the first sidewall 23 and the second sidewall 24.
It is understood, each of the first ventilation opening 231 and the second ventilation opening 241 can also be located on the top wall 21 or the bottom wall 22.
Referring to FIG. 6, an indoor illuminating device 200 according to a second exemplary embodiment is shown. The indoor illuminating device 200 is similar to the indoor illuminating device 100 of first embodiment; the differences between the indoor illuminating device 200 and the indoor illuminating device 100 is that: the indoor illuminating device 200 includes two housings 20, an airflow generating device 30, and an air guide pipe 40; the air guide pipe 40 is vertically located at a center of the indoor illumination device 200, projects upwardly and communicates with the second ventilation openings 241 of the two housings 20. The airflow generating device 30 is disposed in a top of the air guide pipe 40. The airflow generating device 30 is a ventilation fan. Alternatively, although FIG. 6 shows that the air guide pipe 40 is a vertically-extended and rigid pipe, it can be understood by those skilled in the art that the air guide pipe 40 can be a flexible pipe which is connected to a vent of a central air conditioning system or an indoor air exchanging system of a building using the indoor illumination device 200. In such case, the central air conditioning system or the indoor air exchanging system functions as the airflow generating device 30. When the central air conditioning system or the indoor air exchanging system is used, the cost of the indoor illuminating device 200 can be lowered. Preferably, the housing 20 can also be a portion of an airflow pipe of the central air conditioning system or the indoor air exchanging system to further lower the cost of the indoor illuminating device 200. The number of the housings 20 of the indoor illuminating device 200 is not limited to two, in other embodiment, the number of the housings 20 of the indoor illuminating device 200 can also be three, four, five and so on.
While certain embodiments have been described and exemplified above, various other embodiments will be apparent to those skilled in the art from the foregoing disclosure. The disclosure is not limited to the particular embodiments described and exemplified, and the embodiments are capable of considerable variation and modification without departure from the scope and spirit of the appended claims.



{'application_number': '<application-reference appl-type="utility">\n<document-id>\n<country>US</country>\n<doc-number>12905093</doc-number>\n<date>20101015</date>\n</document-id>\n</application-reference>', 'publication_number': '<publication-reference>\n<document-id>\n<country>US</country>\n<doc-number>20110316418</doc-number>\n<kind>A1</kind>\n<date>20111229</date>\n</document-id>\n</publication-reference>', 'source_file': './application/2011/ipa111229.xml', 'source_data': 'USPTO-Application'}