To significantly improve response time characteristics by a structure enabling mass production.
A dynode unit (DY1) at a second stage from a photocathode (200) supports a first dynode receiving photoelectrons from the photocathode (200), a first-stage dynode unit (DY2) supports a second dynode receiving secondary electrons from the first dynode. Further, a dynode pin (430), as an electron multiplier section (400) is viewed from a photocathode (200) side, is retained within an effective region (AR1) of the electron multiplier section (400) contributing to secondary electron multiplication. With this structure, a focusing distance (D) from the photocathode (200) to the first-stage dynode unit (DY2) is shortened and the effective region (AR1) is enlarged to effectively reduce variations in transit time of photoelectrons propagating from the photocathode (200) to the first-stage dynode unit (DY2).
KUSHIMA HIROYUKI
SHIMOI HIDEKI
KODAMA TSUYOSHI
Shiro Terasaki
Satoru Ishida