| 摘要 |
PURPOSE:To measure the eccentric amount between an electron gun and a neck section by measuring the referential points of the electron gun and the neck section through an optical line sensor then rotating the cathode ray tube to measure the referential point which is point symmetrical with said referential point and detecting the difference. CONSTITUTION:A measuring point or a referential point is set in an electron gun structure 1 contained in a neck section 16a thus to temporarily secure the electron gun 1. Then a parallel beam 19 is irradiated from a parallel light source 20 and collected through a focus lens 21 to a line sensor 22. At this time the line sensor 22 will detect the referential point (A) on the outer face of the neck section 16a and the referential point (B) on the outer face of the electron gun structure 1. Then the bulb is rotated by 180 deg. to measure the referential points A' and B'. Thereafter A-A' and B-B' are calculated detected as the eccentric amount of the electron gun structure 1. |
