Color separation prism assembly for C-mount camera
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
May 24, 1996
filing date -
Jun 14, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A color separation prism assembly includes an imaging lens, a blue light separation prism, a red light separation prism and a green light transmission prism, arranged in this order behind the imaging lens. A blue light reflecting dichroic layer is located between the blue light separation prism and the red light separation prism. A red light reflecting dichroic layer is located between the red light separation prism and the green light transmission prism. The prism assembly satisfies the relationships defined by 20.degree.<.alpha.<22.degree.; and 35.degree.<.beta.<37.degree., wherein .alpha. represents an angle defined between a light incident surface of the blue light separation prism, perpendicular to an optical axis of the imaging lens and the blue light reflecting dichroic layer, and .beta. represents an angle defined between a light incident surface of the red light separation prism, parallel to the blue light reflecting dichroic layer and the red light reflecting dichroic layer.
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