Observation optical system

Details Observation optical system Observation optical system

2008-04-08

2010-06-29

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

With reflecting element

C359S680000, C359S681000, C359S682000

Reexamination Certificate

active

07746566

ABSTRACT:
An observation optical system has a negative lens unit including a cemented lens, arranged at the most object-side position; an annular reflecting mirror placed on the image side of the negative lens unit, with a reflecting surface facing the image side; and an imaging lens unit arranged on the image side of the negative lens unit and the annular reflecting mirror.

REFERENCES:
patent: 5331467 (1994-07-01), Sato
patent: 7486446 (2009-02-01), Mihara
patent: 2000-322564 (2000-11-01), None

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