Television – Camera – system and detail – Optics
Reexamination Certificate
2006-08-22
2006-08-22
Ho, Tuan (Department: 2622)
Television
Camera, system and detail
Optics
C348S336000, C348S345000, C348S354000
Reexamination Certificate
active
07095443
ABSTRACT:
In a color separation optical system in a camera, subject light entering focus-imaging elements, to which optical path lengths from the taking lens are different, is obtained with a light dividing face. The focusing state is determined with focus evaluation values according to high frequency components of images captured by the focus-imaging elements. Thus, the focusing state can be quickly determined by a simple construction without using the wobbling method. The green light in the subject light entering the color separation optical system is transmitted through a blue light separation prism and a red light separation prism, and is divided into a reflected light and a transmitted light by a beam splitter face, which is a contact face between a first green light separation prism and a second green light separation prism. The light reflected on the beam splitter face exits from the color separation optical system as the subject light for determining the focusing state, and enters the focus-imaging element.
REFERENCES:
patent: 4507679 (1985-03-01), Bendell
patent: 5436661 (1995-07-01), Yamamoto et al.
patent: 5889555 (1999-03-01), Kawase et al.
patent: 6362852 (2002-03-01), Ito
patent: 8-50227 (1996-02-01), None
Daniels Anthony
Fujinon Corporation
Harness & Dickey & Pierce P.L.C.
Ho Tuan
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