| 摘要 |
The present invention relates to a projection lens unit, and more specifically, to a projection lens unit for a pico projector using a field lens, including a first to a fourth lens arranged sequentially toward image elements from a screen to which an image is projected, and a fifth lens, wherein the first lens is a lens with negative refractive power, the second lens is a lens with a positive refractive power, the third lens a lens with a negative refractive power, the fourth lens is a lens with a positive refractive power, and the fifth lens is a lens with a positive refractive power. The first, third, and fifth lenses are plastic while the fourth lens is glass. The projection lens unit can minimize performance change due to heat. |
