Heat dissipation module for optical projection system

Abstract

A heat dissipation module for an optical projection system includes a flow channel, a fan and an air filter. The flow channel is disposed in the optical projection system and has an air intake and an air vent. The fan is disposed in the flow channel to induce an air flow and has an air inlet and an air outlet. The air flow enters the flow channel via the air intake, passes through the air inlet and the air outlet in succession and leaves the flow channel via the air vent. A color wheel and a photo sensor are disposed in the flow channel and positioned between the air intake of the flow channel and the air inlet of the fan, and an integration rod is disposed in the flow channel and positioned between the air outlet of the fan and the air vent of the flow channel. The air filter is disposed in the air intake of the flow channel.

Description

BACKGROUND OF THE INVENTION[0001]a. Field of the Invention[0002]The invention relates to a heat dissipation module and, more particularly, to a heat dissipation module suitable for an optical projection system.[0003]b. Description of the Related Art[0004]Referring to FIG. 1A, when a conventional projector 100a operates, a light beam emitted by a lamp (not shown) passes through a rapidly-rotating color wheel 102 and then projects onto a digital micro-mirror device (not shown) to form an image. Typically, an index mark 104 is attached to a wheel motor 102a of the color wheel 102 to synchronize the on / off state of each micro mirror with the rotation of the color wheel 102. A photo sensor 106 reads the index mark 104 to recognize which region of the color wheel 102 the light beam currently passes through so as to form an image with desired colors. However, in the above design, the color wheel 102 and the photo sensor 106 are often positioned near the lamp to result in extremely high tem...

AI Technical Summary

Benefits of technology

[0006]The invention provides a heat dissipation module for an optical projection system, and the heat dissipation module has optimized cooling and filtering effects.

[0015]The embodiment or the embodiments of the invention may have at least one of the following advantages. According to the above embodiments, when a fan rotates to induce an air flow, the air flow passes through the air filter first and then flows through the color wheel, the photo sensor and the integration rod to achieve cooling effects. Accordingly, except the color wheel, the photo sensor and the integration rod are sufficiently cooled down, the air filter that the air flow first passes through filters dust particles or foreign objects contained in the air flow. This prevents the dust particles or foreign objects brought by the air flow from being deposited on the index mark and the photo sensor to avoid system failure, and prevents the dust particles or the foreign objects from entering the integration rod to avoid a bad influence on the output brightness of the optical projection system. Further, since the wheel motor is surrounded by the flow channel, noises made by the rotating wheel motor are reduced as a result of insulation provided by the flow channel, and the overall noises made by the optical projection system are reduced accordingly.

Problems solved by technology

However, in the above design, the color wheel 102 and the photo sensor 106 are often positioned near the lamp to result in extremely high temperatures.

However, dust particles are liable to enter the projector 100a hanging upside-down on the ceiling via the opening 112.

However, in this design dust particles are similarly liable to enter the projector 100b accompanying with the air flow and deposited on the photo sensor 106 or the index mark 104 to cause abnormal displayed colors or abnormal system shutdowns.

However, such design fails to confine the air flow in an effective area to result in limited cooling effects.

Images