Patent ID: 11917339
Assignee: LARGAN PRECISION CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. A projection device, comprising:
a circuit board;
a light engine, disposed on the circuit board, and the light engine comprising:
an image surface, comprising a first image area, a second image area, and a third image area;
a projected light surface, comprising a first light source, a second light source, and a third light source, wherein the first light source, the second light source, and the third light source provide light with different wavelengths;
a projection lens assembly; and
a plurality of folding elements, disposed between the image surface and the projected light surface, wherein the plurality of folding elements comprise a first folding element, a second folding element, and a third folding element that are arranged along a light emitting axis;
a casing, enclosing the circuit board and the light engine; and
a heat dissipation device, connected to the casing;
wherein the image surface and the projected light surface of the light engine are substantially in parallel with the light emitting axis, and there is an air gap located between the image surface and the projected light surface;
wherein among the light engine, the first light source corresponds to the first folding element and the first image area, the second light source corresponds to the second folding element and the second image area, the third light source corresponds to the third folding element and the third image area, and the light emitting axis and the projection lens assembly are disposed on a same optical path.