| 摘要 |
A light collecting device adapted for a projection apparatus is provided. The light collecting device at least comprises a light collecting rod that has a body, a longitudinal direction, an incident end, and an emergent end. The incident end comprises an incident surface and a reflecting surface, in which the incident surface is adjacent to the reflecting surface to form an included angle therebetween. The emergent end is opposite to the incident end. Thus, a first light beam passes through the incident surface of the incident end and travels along the body of the light collecting rod towards the emergent end along the longitudinal direction when a second light beam enters into the body of the light collecting rod. The second light beam is reflected by the reflecting surface of the incident end towards the emergent end along the longitudinal direction.
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