| 摘要 |
PURPOSE:To improve the accuracy of a lens system by inserting holding rods into >=2 holding holes provided to the respective lenses of the lens system, interposing spacers to the holding rods and maintaining the spaces between the lenses. CONSTITUTION:Three holding holes 22-25 are provided in the trisected positions of the holding edges 6 on the respective outside circumferences of lenses 11-4. Holding rods 20 are inserted into the respective holes and spacers 16-18 are interposed to the rods 20 to maintain the required spaces required by the respective lenses and to align the optical axes of the lenses 11-14, thereby constituting a lens system. The problem of the lens accuracy which is affected by the dimensional accuracy of the inside diameter of a metallic frame and the outside diameter of the lens when the metallic frame as a holder is used is eliminated and the accuracy of the lens system is assured by the simple method. |
