Patent ID: 11915921
Assignee: DENKA COMPANY LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for manufacturing an electron source comprising steps of:
(a) preparing a plurality of first members each provided with a columnar portion made of a first material having an electron emission characteristic;
(b) preparing a plurality of second members each of which has a higher work function than the first material, and in each of which a hole extending in a direction from one end face toward the other end face is formed;
(c) selecting one first member from the plurality of first members and selecting one second member from the plurality of second members; and
(d) pressing the columnar portion of the selected first member into the hole of the selected second member,
wherein each of the columnar portions of the plurality of first members has a substantially quadrangular cross-sectional shape,
each of the holes of the plurality of second members has a substantially circular cross-sectional shape,
in step (c), a set of the first member and the second member satisfying the following condition is selected from the plurality of first members and the plurality of second members,
in step (d), by pressing the columnar portion into the hole of the second member, a portion of a side surface of the columnar portion abuts an inner surface of the hole of the second member, thereby fixing the columnar portion to the second member, and
the condition is such that L1 and R1 satisfy the following inequality (1):

L1/R1>1  (1),

wherein L1 indicates a length of the longer one of two diagonals of the substantially quadrangular shape, and R1 indicates a diameter of the hole.