US Patent 7515194 Image pickup optical system and optical apparatus using the same
Patent 7515194 was granted and assigned to Olympus Group on April, 2009 by the United States Patent and Trademark Office.
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An image pickup optical system includes, in order from the object side, a front unit having at least one reflecting surface with power that is rotationally asymmetrical, an aperture stop, and a rear unit having at least one reflecting surface with power that is rotationally asymmetrical. In this case, F-numbers in two directions perpendicular to each other on a plane perpendicular to the optical axis are different. Decentration takes place in one of the two directions and the F-number in a direction perpendicular to a decentering direction is smaller than that in the decentering direction. When the F-number in the decentering direction is represented by FNY and the F-number in the direction perpendicular to the decentering direction is represented by FNX, the optical system satisfies the following condition:1.1<FNY/FNX<2.0.
US Patent 07515194 Image pickup optical system and optical apparatus using the same US Patent 7515194 Image pickup optical system and optical apparatus using the same
US Patent 07515194 Image pickup optical system and optical apparatus using the same
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