Image-forming optical system having a decentered optical element

Details Image-forming optical system having a decentered optical element Image-forming optical system having a decentered optical element

2000-01-31

2000-10-03

Mack, Ricky

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359637, G02B 2714

Patent

active

061281379

ABSTRACT:
An image-forming optical system, e.g. a variable-magnification optical system, using a compact decentered optical system capable of providing a clear image of minimal distortion even at a wide field angle. The image-forming optical system includes a first lens unit G1 disposed on the object side and formed from a decentered optical system, and a second lens unit G2 disposed on the image side of the first lens unit G1 and having at least one lens. The decentered optical system has at least one rotationally asymmetric surface having no axis of rotational symmetry in nor out of the surface to correct rotationally asymmetric aberrations caused by decentration. In the case of a variable-magnification optical system, a magnification change is effected by changing at least one spacing between the lens units.

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