Image-forming optical system

Details Image-forming optical system Image-forming optical system

2005-05-31

2005-05-31

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Asymmetric

C359S726000, C359S793000

Reexamination Certificate

active

06900950

ABSTRACT:
A high-performance and low-cost image-forming optical system has a reduced number of constituent optical elements and is made extremely thin, particularly in a direction perpendicular to an image pickup device, by folding an optical path using only three reflecting surfaces. The image-forming optical system has a front unit including a first prism10,an aperture stop2,and a rear unit including a second prism20.The first prism10has a first transmitting surface11,a first reflecting surface12,and a second transmitting surface13.The second prism20has a first transmitting surface21,a first reflecting surface22,a second reflecting surface23,and a second transmitting surface24.An optical path incident on the first reflecting surface22and an optical path exiting from the second reflecting surface23intersect each other. The first reflecting surface12of the first prism10and the first and second reflecting surfaces22and23of the second prism20have a curved surface configuration that gives a power to a light beam. The curved surface configuration is a rotationally asymmetric surface configuration that corrects aberrations due to decentration.

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