| 摘要 |
PURPOSE:To simplify structure and to prevent a center from being deviated at the time of assembly by directly pushing a case, which houses a solid-state image pickup lens, with a control ring screwed to a chassis, and regulating the rotation of the control ring with the elastic force of a beam provided in the housing case. CONSTITUTION:When force more than a specified level is applied to a control ring 18, a projection 191 pushed to the recessed part of the control ring 18 is pushed out by the elastic force of a beam 192 and the control ring 18 starts rotation. At such a time, a case 19 tries to rotate in the same direction with the frictional force of a contact surface and this motion is blocked, however, by a rib 172 provided in a chassis 17. Therefore, the case 19 is parallelly moved so as to enlarge a distance between a lens fitting surface 102 of a C mount and a photodetecting surface 111 of a solid-state image pickup element. At such a time, the case 19 is pushed to the control ring 18 by a double torsion spring 21 and the control ring 18 and the case 19 are fitted each other on a taper surface. Accordingly, respective axes are not deviated. Thus, the structure is simplified and assembly accuracy is improved. |
