| 摘要 |
PURPOSE:To easily and surely bring a prism into press-contact with the lens side in a case and also to extremely reduce the extent of the change in press- contacting accompanying the lapse time by providing a pair of interlocking prism press-contacting members on two inclined sides opposite to each other across the prism. CONSTITUTION:Viewing the prism 4 from the side, at least a pair of two interlocking prism press-contacting members 11 is installed on two inclined sides 13 opposite to each other across the prism 4. The leading end of the prism press-contacting member 11 is curved, and when the member is brought into contact with the inclined surface 13 of the prism, a force is imparted to the inclined surface 13 in a direction P. The force P is separated into directions P1 and P2, then, the prism 4 is thoroughly brought into press-contact toward a position M. Two or more press-contacting members 11 are installed on the same side surface, so that a screw is not loosened by the change with time and an impact, and then, the prism is stably mounted. |
