| 摘要 |
PURPOSE:To enable maintenance of the optical characteristic of a lens at high performance by forming the bore of a lens frame to a large diameter in such a way that an adhesive agent layer is freely deformable in the radial direction of the lens and interposing a non-adhesive member in the contact surfaces between the lens frame and the lens. CONSTITUTION:The lens 8 is adhered and fixed to the lens frame 9 via the adhesive agent 10 interposed between the outside periphery of the lens 8 and the inside circumferential peripheral surface of a lens housing part 12. A barrier part 14 having a small coefft. of friction is interposed in the contact surface with the lens 8 in a step part 13 for holding the lens. The adhesive agent 10 is freely deformable in the radial directon according to such constitution and therefore even if the temp. change owing to using environment, the expansion or shrinkage of the lens or the shrinkage of the adhesive agent on curing arises, such change is absorbed. The generation of the optical strain in the lens 8 is thus prevented and the optical characteristic of the lens is maintained at high performance. |
