Patent ID: 7553032

Claim:
An imaging system for an optical engine of a projection apparatus, comprising: a body; a prism device, connected with the body, the prism device comprising a prism assembly and the prism assembly comprising a bottom surface, a light input end, and a light output end forming an included angle with the light input end; a digital micromirror assembly, disposed under the prism device, the assembly comprising a digital micromirror device (DMD) comprising an effective optical processing area spaced a substantially fixed distance d from the bottom surface of the prism assembly; and a projection lens assembly, connected with the body, and disposed at a side of the prism device, wherein the projection lens assembly comprises a light input end spaced a distance D from the light output end of the prism device; wherein: the prism device further comprises a carriage, the prism assembly is positioned on the carriage, and the prism assembly is connected with the body through the carriage; the imaging system further comprises a slide mechanism disposed between the carriage and the body, such that the prism device is adapted to move transversely, relative to the body of the optical engine whereby the distance D is made being adjustable.