Patent ID: 7023134

Claim:
A dynode manufacturing method for forming a through-hole, one end of which serves as an input opening and an opposite end of which serves as an output opening, in a plate, comprising: a step of forming the input opening while etching a predetermined part of one side surface of the plate in such a way as to draw a first locus shaped like a substantially circular arc having a predetermined radius when seen from a direction parallel to the plate; and a step of forming the output opening while etching a predetermined part of an opposite surface of the plate in such a way as to draw a second locus shaped like a substantially circular arc that comes in contact with the first locus or that overlaps the first locus when seen from the direction parallel to the plate, the second locus having a predetermined radius when seen from the direction parallel to the plate, a center of the second locus being situated with a deviation in the direction parallel to the plate with respect to a center of the first locus.