| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact image formation optical system constituted of as small number of lenses as possible so as to be made small in a radial direction while coping with such a wider angle that a half angle of view is≥90°, and an imaging apparatus using the same. SOLUTION: The image formation lens is constituted of a first lens L1 that is a negative lens, a second lens L2 that is a meniscus lens turning its concave surface to an object side, an aperture stop S, and a lens group G having positive refractive power in order from the object side. COPYRIGHT: (C)2008,JPO&INPIT
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