1. Field of the Invention
The present invention relates to a projector, and particularly to a projector having heat dissipation devices for dissipating heat generated by a plurality of LED light sources in the projector.
2. Description of Related Art
Nowadays, projectors are commonly used in many fields such as meetings and presentations in an office or used as a home image output device. Due to a requirement of high brightness, a high power light source is needed in the projector. It becomes a tendency to use a high powered LED as the light source for the projector. After a period of operation, the light source generates a large amount of heat in the projector, which leads to a high temperature that affects the operations of the projector and reduces the lifespan of other elements. To resolve the heat problem in the projector, a heat dissipation device is usually provided. However, due to the limitation of the inner space of the projector, the large amount of heat generated by the light source can not be effectively dissipated by the conventional heat dissipation device.
What is needed, therefore, is a projector having a plurality of light sources with heat dissipation devices respectively attached thereto and thermally connecting therewith, whereby heat generated by the light sources can be effectively dissipated.
A projector includes a plurality of light sources and a heat dissipation device assembly attached to and thermally connecting with the light sources for dissipating heat generated by the light sources. The heat dissipation device assembly includes a first heat dissipation device, a second heat dissipation device and a third heat dissipation device, each of the heat dissipation devices being attached to and thermally connecting with a corresponding light source. The first heat dissipation device includes a first heat sink attached to a corresponding light source, a fin assembly and a bent heat pipe connecting the first heat sink and the fin assembly. The second heat dissipation device includes a base attached to a corresponding light source and a plurality of fins. The third heat dissipation device includes a base attached to a corresponding light source and a plurality of fins.
Other advantages and novel features will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
The heat dissipation device assembly 20 comprises a first heat dissipation device 30, a second heat dissipation device 40 and a third heat dissipation device 50. A part of the first heat dissipation device 30 is located adjacent to the lateral side of the main body 10. Another part of the first heat dissipation device 30 and the second heat dissipation device 40 are located adjacent to a rear side of the main body 10. The third heat dissipation device 50 is located adjacent to another lateral side of the main body 10. A first, second and third light sources 301, 401, 501 are attached to and thermally connect with the first, second and third heat dissipation devices 30, 40, 50, respectively. In the present embodiment, the first light source 301 has the greatest power among the three, and the third light source 501 has the smallest power among the three. That is to say, the heat generated by the first light source 301 is the most, and the heat generated by the third light source 501 is the least. In accordance with preferred embodiment, the three light sources 301, 401 and 501 are LED lamps respectively of 24.5 W, 12.5 W and 7.35 W.
Please also referring to
Referring to
The fin assembly 36 of the first heat dissipation device 30 is similar to the fins 324 of the first heat sink 32. A perpendicular air passage 363 is defined between every two adjacent fins of the fin assembly 36. A hole (not labeled) is defined in the fin assembly 36 for receiving another part of the heat pipe 35 therein. The heat pipe 35 is L-shaped and comprises an evaporating portion 352 received in the channel 3221 of the first heat sink 32 and a condensing portion 354 received in the hole of the fin assembly 36. Particularly, the evaporating portion 352 of the heat pipe 35 is flattened and the condensing portion 354 of the heat pipe 35 is round.
Referring to
Referring to
A heat spreader 31 is sandwiched between the base 322 of the first heat sink 32 and the first light source 301; a heat spreader 41 is sandwiched between the base 42 of the second heat dissipation device 40 and the second light source 401; a heat spreader 51 is sandwiched between the base 52 of the third heat dissipation device 50 and the third light source 501, for reducing a thermal resistance therebetween. In accordance with the embodiment, the heat spreaders 31, 41, 51 are all made of copper. The bases 322, 42 are made of aluminum and the base 52 is made of copper.
Corresponding to the situation that the first light source 301 generating much more heat than the second and third light sources 401, 501, the first heat dissipation device 30 not only uses the first heat sink 32 to dissipate the heat generated by the first light source 301, but also uses the heat pipe 35 to thereby quickly transfer the heat to the fin assembly 36. The heat in the fin assembly 36 is quickly dissipated to a surrounding environment via the cooling fan 60.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.