| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical element with a lens barrel coping with the volume error of optical material without spoiling attaching accuracy, airtightness and attaching strength. SOLUTION: A holder optical element 5 is equipped with: a lens barrel 2 which has cylindrical shape and where a recessed part 2a is formed on the inside surface of the cylindrical shape; and an optical element 1 held in the lens barrel 2. The optical element 1 includes: a lens part 1a having an optical functional surface; an edge part 1b formed on the outer periphery of the lens part 1a and butting against the lens barrel 2; and a periphery part 1c formed on the outer periphery of the edge part 1b and holding the optical element 1 by getting into the recessed part 2a of the lens barrel 2. The recessed part 2a of the lens barrel 2 is set so that the width (a) of the recessed part 2a in the optical axis direction of the optical element 1 has a relation of a>c to the thickness (c) of the edge part 1b of the optical element 1. COPYRIGHT: (C)2009,JPO&INPIT
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