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US RE38,234 E1Granted
Ultraviolet detector
AssigneeHamamatsu Photonics K.K.
InventorsHidenaga Warashina, Yuji Shimazu
Life of this patent
Estimating the term…
Abstract
An ultraviolet detector comprises a metal tubular member which hermetically encloses an anode and a cathode therein and is filled with a discharged gas introduced therein from a metal exhaust tube. After the anode and the cathode are enclosed within the tubular member, the ultraviolet detector can be made without being subjected to any glass fusing process. Accordingly, the inside of the sealed vessel V1 can be prevented from being contaminated with fluorine, whereby the ultraviolet detector with stable characteristics can be provided.
Claims3
An ultraviolet detector comprising:
- a sealed vessel including a tubular member, a window member and a stem, said tubular member having an opening and being made of a metal material blocking ultraviolet radiation, said window member being made of a glass material transparent to ultraviolet radiation and closing said opening, said stem having a metal portion contacting to said tubular member and a glass portion not contacting said tubular member;
- an anode a cathode disposed within said sealed vessel at positions opposing said window member;
- a cathode, an anode disposed within said sealed vessel between said window member and said anode cathode, secured to said tubular member or said metal portion of said stem;
- a lead pin penetrating said glass portion of said stem for securing said anode cathode and supplying voltage to said anode cathode;
- and
- a gas enclosed in said sealed vessel.
3 more elements
Dependencies are inferred from the claim text.