| 摘要 |
PURPOSE:To permit the easy press fitting of a lens and to prevent the breakdown of the lens by providing plural axial wire-shaped projecting pats to the inside surface of the hole of a metallic frame to be press-fitted with the lens so that the lens is press-fitted to the projecting pats. CONSTITUTION:The plural wire-shaped projecting pats 12 are provided in the axial direction of the lens press-fitting hole 12 of the lens frame 11 consisting of a metal where the diameter of said hole is designated as D3. The outside diameter D1 of the lens 13 to be press-fitted is made to have of the concentrical circle connecting the plural projecting parts is designated as D2. The press-fitted lens 13 presses only the projecting parts 12 of the frame 11 and is fitted by deforming the uther parts and therefore the pressing force in the stage of press fitting is small. The factor for the cracking of the lens 13 is thus decreased and the pressure during fitting to be exerted to the lens 13 after the press fitting is limited only at the projecting parts 12 of the press-fitting hole. The pressure to be exerted at all times to the lens 13 is thereby decreased and such pressure as to break the lens after the press fitting is decreased as well. |
