| 摘要 |
PURPOSE:To obtain an image pick-up tube having high S/N and high resolution by employing rigid insulator ring for the body of ring-shaped signal electrode while coating a conductive film on a portion of the surface of the insulator where a signal is taken out to form a conductive path of small area. CONSTITUTION:The signal isn't required to be taken out from the entire circumference of a ring-shaped signal electrode and a rigid insulator such as ceramic ring 12 is employed as the body of said ring-shaped signal electrode, and for the purpose of ensure a minimum conductive path to be connected with a transparent conductive film on a face plate and to take out an image signal, condutive film 13 of Al, Au is coated on the surface of an insulator ring 12 and a small area facing against the ear section 14 of transparent conductive film 10 on the face plate. With such arrangement an image pick-up tube having high resolution and high S/N is obtained. |
