| 摘要 |
A lens device comprises a lens element having round depressions formed in the back thereof and a lens barrel provided with round projections formed correspondingly in position to the round depressions each of which has an axial length shorter than an axial depth of the round depression and an outer diameter smaller than an inner diameter of the depression. The lens element is held in the lens barrel with the round projections received in the round depressions, respectively.
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