Patent ID: 9460899
Filing Date: 2016-10-04
CPC Classification: H01J

Claim Text:
1. A photomultiplier, comprising: an enclosure having an internal space kept in a vacuum state and having at least a part constituted by a silicon substrate, the silicon substrate having an inner surface and an outer surface which oppose each other and define a thickness of the enclosure, the inner surface of the silicon substrate facing the internal space of the enclosure, the outer surface of the silicon substrate being exposed to external of the enclosure; a photocathode accommodated in the enclosure; an anode accommodated in the enclosure; an electron multiplying section accommodated in the enclosure, the electron multiplying section cascade-multiplying electrons emitted from the photocathode in a direction from one end thereof to the other end thereof, the other end of the electron multiplying section being positioned at a side where the anode is arranged; and a glass window constituting a part of the enclosure and configured to introduce light from the external of the enclosure to the photocathode, wherein the electron multiplying section is arranged on an inner surface of the enclosure which defines the internal space of the enclosure, and, wherein the glass window has an inner surface and an outer surface opposing the inner surface thereof, the inner surface of the glass window facing the internal space of the enclosure, the outer surface of the glass window being exposed to the external of the enclosure, and wherein the glass window is supported by the silicon substrate while the glass window is arranged within a space sandwiched by a first plain including the outer surface of the silicon substrate and a second plain including the inner surface of the silicon substrate.