1. Field of the Invention
The present invention generally relates to a projection apparatus, and particularly, to a projection apparatus having a plurality of light sources.
2. Description of Related Art
As science and technology develop, demand of projection apparatus for higher brightness are increasing, which can not be satisfied by that having a single light source. Accordingly, projection apparatus employing multiple light sources have been proposed.
However, projection apparatus employing multiple light sources correspondingly consumes more electricity, which also generates excessive heat. Therefore, the heat dissipation system, especially for the multiple light sources, becomes a critical concern in designing the projection apparatus. Light sources generate a lot of heat, thus heat dissipation systems for light sources are very important for controlling the temperature thereof within a range prescribed by the manufacturers in order to maintain the characteristics and lifetime of the light sources.
In a conventional projection apparatus employing multiple light sources, a typical heat dissipation system used for conventional projection apparatus employing a single light source is used, which comprises a blower, a wind duct and an axial fan disposed adjacent to the single light source, and the wind duct is capable of guiding a cooling airflow generated by the blower to a burner of the light source for cooling down the temperature thereof. The axial fan is capable of generating another cooling airflow for cooling a reflecting cover of the light source. However, when such a heat dissipation system is employed in a projection apparatus using multiple light sources, corresponding numbers of fans, wind ducts and axial fans are required, which increases not only the cost but also the volume thereof. Further, using more blowers not only consumes more electricity, but also makes the system circuit thereof more complex. Also, using more blowers even limits the size of the projection apparatus, so that the bulkiness thereof cannot be minimized.