| 摘要 |
PROBLEM TO BE SOLVED: To provide a small and simple reflection type photographic optical system which can acquire an object with a view angle substantially equal to or larger than 180 degrees, in which the occurrence of noise light is suppressed and negative distortions are relaxed. SOLUTION: A reflection type photographic optical system 100 has a 1st reflecting mirror 1. which is arranged at the side of the object, an imaging lens I and a 2nd reflecting mirror 12 for reflecting the light image of the 1st reflecting mirror 1 toward the imaging lens I and in the system, the reflecting surface 1a of the 1st reflecting mirror 1 is made of a curved surface shape, being convex to the side of the object so as to acquire the visual range of the object over a wide angle being roughly equal to or larger than 180 degrees , for example, a hyperboloid cylinder and the mirror 1 is arrange by being inclined to the face of the object and moreover the arrangement relation of respective optical elements is set so that the incident optical axis L of the light image of the object to the !st reflecting mirror 1 and the lens optical axis L2 of the imaging lens I intersect perpendicularly. Thus, a small and simple photographic optical system, which can acquire a view angle roughly equal to or larger than 180 degrees by using the bent reflecting mirror at an objective face as objective surface and can obtain an image in which distortions are not so disconcerting and with satisfactory aberrations, is obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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