| 摘要 |
PROBLEM TO BE SOLVED: To extremely simply provide a wide angle image optical system which is suitable for wide-angle panoramic photographing or observation by combining a pair of reflection surfaces having a cylindrical surface or a shape closely similar to a cylinder, for example a toric surface, a toroidal surface, or a conical surface. SOLUTION: The wide angle image optical system includes 1st and 2nd cylindrical reflection surfaces 1 and 2, and they are arranged so that the curvature center axis of the 1st reflection surface 1 may be nearly orthogonal to the curvature center axis of the 2nd reflection surface 2, and the system is provided with an optical system 3 for forming light which is made incident on the 2nd reflection surface 2 and reflected by the surface 2 after being made incident on the 1st reflection surface 1 and reflected by the surface 1 into an image. It is allowed to make the 1st reflection surface 1 convex and to make the 2nd reflection surface 2 also convex. The 1st and 2nd cylindrical reflection surfaces 1 and 2 have the cylindrical surfaces, the toric surfaces, the toroidal surfaces and the gentle conical surfaces, etc., so as to compensate the image distortion.
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