Optical system and image projecting apparatus using the same

摘要

The optical system includes: a first optical group which performs a zoom function using a first movable lens, a second optical group which performs a focus function using a second movable lens, and a third optical group which performs a wide angle function by reflecting light passing through the first optical group and the second optical group, wherein a first intermediate image is formed between the first optical group and the second optical group.

主权项

1. An optical system comprising:
a first optical group which performs a zoom function, the first optical group comprising a first movable lens; a second optical group which performs a focus function, the second optical group comprising a second movable lens; and a third optical group which performs a wide angle function by reflecting light passing through the first optical group and the second optical group, the third optical group comprising a concave mirror, wherein a first intermediate image is formed between the first optical group and the second optical group, wherein a second intermediate image is formed between the second optical group and the third optical group, and wherein the first movable lens, the second movable lens and the concave mirror are arranged in a straight line along an optical axis of the optical system and the first movable lens and the second movable lens move along the optical axis of the optical system.