Photomultiplier and radiation detector
AssigneeHamamatsu Photonics K.K.
InventorsHideki Shimoi, Hiroyuki Kyushima
Life of this patent
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Abstract
The edges of portions of a base member that are joined to stem pins are arranged as bottom surfaces of recesses formed in the stem so that the stem pins are joined to the base member at gradual angles and so that even when a bending force acts on the stem pins, the stem pins will contact the peripheral portions at the open sides of the recesses, thereby preventing further bending of the stem pins and preventing the forming of cracks at both sides of the portions at which the stem pins are joined to the base member. Furthermore, triple junctions, at which the conductive stem pins, the insulating base member to which the stem pins are joined, and vacuum intersect, are positioned inside the recesses and put in concealed-like states.
Claims8
A photomultiplier comprising:
- a photoelectric surface disposed inside a sealed container, which is put in a vacuum state, and converting incident light made incident through a light receiving plate into electrons, which forms an end portion at one side of the sealed container;
- an electron multiplier unit, disposed inside the sealed container and multiplying electrons emitted from the photoelectric surface;
- an anode disposed inside the sealed container and used for taking out the electrons multiplied by the electron multiplier unit as an output signal;
- a stem forming an end portion at the other side of the sealed container and having a base member with an insulating property;
- and
- a plurality of stem pins insertedly mounted in the stem and leading to the exterior from inside the sealed container and electrically connected to the anode and the electron multiplier unit,
- wherein the stem pins is passed through and joined to the base member, and
- the full circumferences of the stem pin passing portions of both the inner surface and the outer surface of the stem are arranged as recesses having the base member as the bottom surfaces.
Dependencies are inferred from the claim text.