| 摘要 |
PROBLEM TO BE SOLVED: To suppress an increase of variations in cutoff voltage and a deterioration in electron emitting capability, due to variations in the thickness of an electron emitting substance layer. SOLUTION: A cathode structure 1 made up of a metallic substrate 11 and a cathode sleeve 12, is inserted into and held by a cathode hold body 5 having a substantially cylindrical space therein, Between the cathode hold body 5 and a printing screen 3 a sheet-shaped spacer 13 having a circular opening part somewhat smaller in diameter than a top surface of the metallic substrate 11 is disposed on a top surface part being a surface to be printed, of the metallic substrate 11, and part of the inserted cathode structure 1 makes contact with a part C of the spacer 13, thus aligning the top surface of the metallic substrate 11 with the spacer 13 by the contact surface between them. The cathode structure 1 is fixed by being pressed against the spacer 13 by means of a cushion material 14, a cathode pressing plate 6, and screws 8, so as to keep a fixed distance between the metallic substrate 11 and the printing screen 3. Then, an electron emitting substance layer is formed so as to coat the metallic substrate 11 by screen-printing.
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