PROJECTION LENS SYSTEM AND PROJECTION SYSTEM

摘要

A projection lens system which is arranged between an object side at which a micro-display panel is located and an image side at which a screen is located, and includes an aperture stop; a front lens group arranged at an object-side of the aperture stop and having a positive refractive power; a rear lens group arranged at an image-side of the aperture stop, the rear lens group including a first aspherical lens at a position closest to the image side and a second aspherical lens adjacent to an object-side surface of the first aspherical lens; and an aspherical mirror having a negative refractive power and reflecting light coming from the rear lens group toward the image side.

主权项

1. A projection lens system arranged between an object side at which a micro-display panel is located and an image side at which a screen is located, the projection lens system comprising:
an aperture stop; a front lens group arranged at an object-side of the aperture stop and having a positive refractive power; a rear lens group arranged at an image-side of the aperture stop, the rear lens group comprising a first aspherical lens at a position closest to the image side and a second aspherical lens adjacent to an object-side surface of the first aspherical lens that is proximate to the object side; and an aspherical mirror which has a negative refractive power and reflects light coming from the rear lens group toward the image side, wherein the projection lens system satisfies the following equation:
2.6<|R25/R24|<3.2 wherein R24 is a radius of a curvature of an object-side surface of the second aspherical lens that is proximate to the object side, and R25 is a radius of a curvature of an image-side surface of the second aspherical lens that is proximate to the image side.