| 摘要 |
PURPOSE:To absorb the dimensional change owing to the temp. change between a plastic lens and a barrel part formed on a supporting cylinder holding said lens by interposing an elastic member between said barrel part and a retaining member. CONSTITUTION:A deformation absorbing member 14 of an elastic material slightly softer than a plastic lens 13 is interposed between the barrel part 12 of a supporting cylinder 11 and the lens 13, and the lens 13 is fixed to the member 14 in pressure contact therewith by means of a retaining ring 15 with a screw 16. Thereby, the dimensional change owing to the temp. change between the lens 13 and the part 12 is absorbed. |
