Patent ID: 8721086

Claim:
A projection apparatus, comprising: an illumination system, capable of providing an illumination beam; a light reflective unit, disposed on a transmission path of the illumination beam; a light valve, disposed on the transmission path of the illumination beam and located between the illumination system and the light reflective unit, wherein the light valve has an active surface and the active surface is capable of converting the illumination beam from the light reflective unit into an image beam; and a light beam adjusting element, disposed on the transmission path of the illumination beam and located between the illumination system and the light valve, and the light beam adjusting element being capable of reflecting a light from the light valve, wherein the light is not the image beam, wherein the light beam adjusting element comprises: at least a lens, having a first optical axis, wherein an included angle between the first optical axis and a normal vector of the active surface is not equal to 90°, wherein the included angle between the first optical axis and the normal vector of the active surface substantially falls in an angle scope greater than or equal to 91.5° and less than or equal to 120°.