Patent ID: 9039189
Filing Date: 2015-05-26
Classification: G03B,H04N

Abstract:
1. A projection apparatus, comprising: a light source, capable of providing an illumination beam; a light valve, disposed on a transmission path of the illumination beam for converting the illumination beam into an image beam, wherein the light valve has an active surface, and the active surface is substantially rectangular-shaped; a light uniforming device, disposed on the transmission path of the illumination beam, and located between the light source and the light valve, wherein the light uniforming device comprises at least one lens array, and the lens array has a plurality of rectangular lenses arranged in an array, and a ratio between a length of a first side of each of the rectangular lenses and a length of a second side of each of the rectangular lenses is greater than a ratio between a length of a short side of the active surface of the light valve and a length of a long side of the active surface of the light valve, and the first side of each of the rectangular lenses is corresponding to the short side of the active surface of the light valve, and the second side of each of the rectangular lenses is corresponding to the long side of the active surface of the light valve; and a lens module, disposed on the transmission path of the illumination beam, and located between the light uniforming device and the light valve, wherein a refractive power of the lens module along a first direction is not equal to a refractive power of the lens module along a second direction, and thereby an f-number of the illumination beam along a direction parallel to a long side of the active surface of the light valve is greater than an f-number of the illumination beam along a direction parallel to a short side of the active surface of the light valve, wherein the ratio between the length of the first side of each of the rectangular lenses and the length of the second side of each of the rectangular lenses is substantially 1, and the first side and the second side are adjacent to each other.