| 摘要 |
PURPOSE:To obtain a lens frame with a low cost by giving such dimensions to inside and outside lens frames that they can be press-fitted to each other and constituting the outside lens frame with plastics at least. CONSTITUTION:The lens frame consists of an inside lens frame 32 which has lens groups 34 and 35 and a gap ring 33 on the inside and has a screw part and a columnar part on the outside and an outside lens frame 31 which has a screw part fitted to the inside lens frame and a columnar part on the inside and to which the inside lens frame is rotated along the screw part and is fitted. The inside lens frame consists of a metal or plastics, and the outside lens frame consists of plastics, and the diameter of the circumscribed circle of the columnar part 37 of the inside lens frame is made larger than that of the inscribed circle of the columnar part 36 of the outside lens frame, and such dimensions are given to both columnar parts so that they can be fitted to each other. Thus, the inexpensive lens frame is obtained without a complicated structure neither a difficult adjustment. |
