| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens system in which an optical path can be bent more acutely, in the lens system where the optical axis is bent acutely. SOLUTION: The lens system 50 in which the optical axis 19 of a first lens group 10 and the optical axis 29 of a second lens group 20 are arranged so as to have an acute angleθby a reflection mirror 30. In the lens system 50, a non-circular lens 13 is disposed adjacent to the reflection mirror 30. The reflection mirror 30 side of the non-circular lens 13 is concave. A portion 13c where one part on the circular section of the non-circular lens 13 is cut includes a concave arch shape 13a. The inside of the arch shape 13a composes part of an optical path 27 reaching the reflection mirror 30 from the second lens group 20. COPYRIGHT: (C)2008,JPO&INPIT
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