PROJECTION LENS APPARATUS

摘要

A projection lens apparatus for enlarging an image of a pixelized panel on a screen includes a first lens group, a second lens group, and a third lens group. The first lens group has a positive power and includes a telecentric lens for telecentrically adjusting a beam emitting from the panel, and an achromatic lens for calibrating a chromatic aberration of the beam which has passed through the telecentric lens. The second lens group has a positive power and includes an aperture stop for adjusting an amount of beams introduced from the first lens group, a first lens having a convex lens shape to have a positive power and configured to adjust power of the beam introduced through the aperture stop, and a second lens having a meniscus shape concavely curved toward the screen to reduce a size of the beam introduced from the first lens. The third lens group calibrates a distortion of the beam introduced from the second lens group, using a non-spherical lens having a meniscus shape convexly curved toward the screen so as to have a negative power.