| 摘要 |
PROBLEM TO BE SOLVED: To maintain positional precision of a lens while reducing the size. SOLUTION: In a one group lens 14, a front side lens 1420, a middle lens 1430 and a back side lens 1440 are arranged along an optical axis direction in which their optical axes are aligned and held by a first lens folding frame 1402. A plurality of notches 1438 are formed on the outer peripheral section of the middle lens 1430. Expanded walls 1456 are expanded toward the peripheral direction in a fan shaped manner from a plurality of places with intervals along the peripheral direction of a first inner peripheral surface 1452 at the places toward a second inner surface 1454, projected to the inner radial direction of the first inner peripheral surface 1452 and formed into the shapes so as to be inserted into the notches 1438 of the middle lens 1430. An abutting surface 1456B is provided on one of the surfaces (the surface facing toward the front) between both surfaces of each expanded wall 1456 along the optical axis direction. COPYRIGHT: (C)2006,JPO&NCIPI
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