| 摘要 |
PURPOSE:To make lens insertion easy and to avoid influences of fin and sink to prevent fall and play of lenses by providing steps to a lens mounting part of a plastic lens frame to make the diameter of a lens inserting aperture part and that of a lens holding part different from each other. CONSTITUTION:In a plastic lens frame 1 into which lenses L1-L7 are set together with interval rings 2-5, one step is provided in the lens fixing position of the inside part of lens insertion, and diameters of individual lens entrance parts and of lens fixing positions A and B are equalized approximately, and the diameter of the intermediate part is changed gradually to prevent play of lenses in lens fixing positions. That is, since the diameter near the lens holding part is larger than the diameter of the aperture part for lens insertion, the plastic lens frame is formed with a mold where the diameter of the lens mounting part is so preliminarily reduced that lenses can be held. |
