Imaging optical system

Details Imaging optical system Imaging optical system

2006-09-19

2006-09-19

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Asymmetric

C359S726000, C359S727000

Reexamination Certificate

active

07110191

ABSTRACT:
The invention has now found out why ghost light occurs in an imaging optical system using a decentered reflecting prism for the purpose of reducing ghost light. The invention provides an imaging optical system comprising at least one decentered prism10having a rotationally asymmetric reflecting surface, at least located on an image side of an aperture stop. The prism10comprises three or more surfaces including an entrance surface11, a reflecting surface12and an exit surface13. The reflecting surface has an effective area A+B+C, and a reflection-enhancing member is applied onto an area B+C except a sub-area A at which an effective light beam is totally reflected.

REFERENCES:
patent: 6181470 (2001-01-01), Sekita
patent: 6327094 (2001-12-01), Aoki
patent: 6462881 (2002-10-01), Takeyama
patent: 6646809 (2003-11-01), Ishino et al.
patent: 6671099 (2003-12-01), Nagata
patent: 6704052 (2004-03-01), Togino et al.
patent: 2003-084200 (2003-03-01), None

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