Patent ID: 6989936
Filing Date: 2006-01-24
Classification: G02B

Abstract:
1. A variable power optical system for enlarging and projecting a reduction side object onto an enlargement side image plane, or reducing and projecting an enlargement side object onto a reduction side image plane, comprising: a first optical component having a reflecting curved surface; and a second optical component disposed more toward the reduction side than said first optical component, said second optical component having a plurality of movable lens units, and effecting a variable power operation by movement of said plurality of lens units; wherein when a ray is traced from the reduction side toward the enlargement side, said second optical component forms an image of a reduction side conjugate point more towards the enlargement side than an optical surface of said first optical component that is most adjacent to the reduction side, and wherein a pupil of said second optical component is located between said first optical component and said second optical component.