| 摘要 |
PROBLEM TO BE SOLVED: To prevent a slip from being generated on the convergence of a color image receiving tube due to the breakage of a lock ring by a stress caused by the clamping of the lock ring, by increasing the strength property of the lock ring. SOLUTION: When the lock ring 117 is to be manufactured by injecting a material into a die, an injection port 124 for the material is located at one of the distal ends of knobs 117a, a plurality of which are provided in a manner to be symmetrical in the lateral direction. In this case, the injected material flows while being divided in two directions as shown by arrows 130a and 130b. Then, a bonded surface 132 which is formed by merging as shown by arrows 131a and 131b is located at a section wherein the other knob 117a exists. Thus, the cross sectional area of the bonded surface 132 increased, and the strength property is increased. |
