Patent ID: 6998778

Claim:
An electron multiplier, comprising: an electron multiplying unit formed by stacking a plurality of dynodes, a plurality of electron multiplying holes being formed in each of the plurality of dynodes for multiplying electrons introduced therein, wherein each of the plurality of electron multiplying holes is an elongated rectangular shape with opposing long sides extending in a first direction and opposing short sides extending in a second direction perpendicular to the first direction; a plurality of glass receiving parts formed on a surface on one dynode of two adjacent dynodes in the plurality of dynodes, wherein each of the plurality of glass receiving parts has a shape defined by a first length extending in the first direction and a second length extending in the second direction, wherein the second length is longer than the short side of the elongated rectangular shape; and a plurality of glass parts each having a base portion bonded to one of the plurality of glass receiving parts, wherein the plurality of dynodes are stacked together with the glass parts interposed between adjacent dynodes wherein each of the plurality of glass parts has a height for preserving a spacing between the adjacent dynodes to suppress a discharge which may occur therebetween.