Vacuum device

Details Vacuum device Vacuum device

2011-03-15

2011-03-15

Estrada, Angel R (Department: 2835)

Electricity: conductors and insulators

Boxes and housings

Hermetic sealed envelope type

C174S050540, C174S520000, C250S207000, C313S544000, C313S532000

Reexamination Certificate

active

07906725

ABSTRACT:
An object is to sufficiently keep the airtightness in a vacuum container even when it is made smaller. A photomultiplier tube1comprises a flat sheet-like lower substrate4, a casing-like frame3berected on the lower substrate4, an upper substrate2including a frame3aairtightly joined to an opening part of the frame3bwhile holding a low-melting metal therebetween, and a frame-like projection25barranged in parallel with the frame3bon the inner side of the frame3bon the lower substrate4.

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