| 摘要 |
PURPOSE:To allow an electron gun to be mounted at a proper position on the neck by means of a reflecting mirror installed on the electron gun of a cathode-ray tube. CONSTITUTION:A reflecting mirror 13 is installed on the side wall 12 of the electron gun 11 encosed in the neck 10 of the bulb of a cathode-ray tube. The bulb of the cathode-ray tube is installed at a predetermined position, and light 15 is emitted from the light source 14 fixed at a predetermined position, and the electron gun 11 is shifted in the neck 10 so that the reflected light 16 reflected from the reflecting mirror 13 is received correctly by a light receiving apparatus 17. It is desirable to apply laser beam and the like which is hardly scattered as the light of the light source 14. |
