Projection apparatus

Abstract

A projection apparatus includes a casing, a light source module, an optical engine module, a heat dissipation module and a projection lens. The casing has multiple air inlets and an air outlet. The light source module is disposed in the casing, and is configured to provide an illumination beam, wherein the light source module includes multiple light sources. The optical engine module is disposed in the casing, and is located on a transmission path of the illumination beam, and is configured to convert the illumination beam into an image beam. The heat dissipation module is disposed in the casing, and is connected to the light sources, where the heat dissipation module includes multiple heat sinks located close to the air inlets, respectively. The projection lens is disposed in the casing, and is connected to the optical engine module, and is configured to project the image beam out of the casing.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of China application serial no. 201820566386.6, filed on Apr. 20, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention relates to an electronic apparatus, and particularly relates to a projection apparatus.Description of Related Art[0003]In an existing projection apparatus, air inlets are respectively configured at a front end of a left side and a back end of a right side of a casing, and air outlets are respectively configured at a right end of a front side and a left end of a back side of the casing. A heat sink of a red light-emitting diode (LED) is disposed corresponding to the air inlet of the back end of the right side, and a heat sink of a green LED is disposed corresponding to the air outlet of the right end of the front side. When ...

AI Technical Summary

Benefits of technology

The invention is a projection apparatus with good heat dissipation. It has a heat dissipation module connected to the light sources, with heat sinks located close to the air inlets. When cooling air enters the casing, it directly cools down the heat sinks, reducing the temperature inside the apparatus. This results in improved cooling efficiency and reduced temperature. Overall, the invention has effective heat dissipation.

Problems solved by technology

Since the red LED and the green LED are more affected by efficiency of a temperature change, a brightness of the red LED is decreased by 7.9% when a temperature thereof is increased by 10° C.; and a brightness of the green LED is decreased by 3% when a temperature thereof is increased by 10° C. Therefore, although the green LED is not so obvious in brightness attenuation in case of temperature increase, an overall light-emitting efficiency thereof is ineffective under a same heat dissipation performance.

Moreover, since a heat sink of a blue LED is located between an optical engine module and an electromagnetic shielding casing covering a power supply, and is not located close to the air inlets and the air outlets and is located at a dead zone of a flow field where the cooling airflow does not pass there through at all, heat produced by the blue LED cannot be exhausted, which results in over temperature of the whole projection apparatus.

However, the above method may cause increase of a noise value of the whole projection apparatus, which may lead to a poor usage experience of consumers.

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