US 5,633,563 AGranted

Gas discharge tube with discharge shielding member

AssigneeHamamatsu Protonics K.K.

InventorsTomoyuki Ikedo, Yoshinobu Ito, Ryotaro Matui

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Abstract

A gas discharge tube includes a light-emitting section in an envelope sealing a gas therein, positioned at distal ends of lead pins while spaced from an inner side wall of the envelope. The light-emitting section includes a hot cathode, an anode, a focusing electrode, and a discharge shielding member having a front surface which faces the hot cathode. The front surface of the discharge shielding member is defined by a first surface being in direct contact with the focusing electrode, for defining a position of the focusing electrode, a second surface continued from the first surface, for defining a distance between the focusing electrode and the anode, and a third surface continued from the second surface and being in direct contact with the anode, for defining a position of the anode.

Claims18

Dependent claims

A gas discharge tube, comprising:

an envelope for sealing a gas therein;
a hot cathode disposed in said envelope, for emitting thermoelectrons;
an anode disposed in said envelope, for receiving the thermoelectrons emitted from said hot cathode;
a focusing electrode disposed in said envelope, said focusing electrode having a focusing opening for converging and passing thermoelectrons which are emitted from said hot cathode and which are received by said anode;
and
a discharge shielding member of an insulator having a front surface for supporting said focusing electrode at a predetermined position, said front surface of said discharge shielding member being defined by:
a first surface being in direct contact with said focusing electrode, for defining a position of said focusing electrode;
a second surface continued from said first surface, for defining a distance between said focusing electrode and said anode;
and
a third surface continued from said second surface, said third surface being in direct contact with said anode, for defining a position of said anode,
wherein said second and third surfaces of said front surface of said discharge shielding member form a first depression for supporting and accommodating said anode.

8 more elements

A gas discharge tube, comprising:

an envelope for sealing a gas therein;
lead pins introduced into an inner space of said envelope from outside of said envelope;
and
a light-emitting section in said envelope, positioned at distal ends of said lead pins and supported by said lead pins while spaced from an inner side wall of said envelope, said light-emitting section including:
a hot cathode for emitting thermoelectrons;
an anode for receiving the thermoelectrons emitted from said hot cathode;
a focusing electrode having a focusing opening for converging and passing thermoelectrons which are emitted from said hot cathode and which are received by said anode;
and
a discharge shielding member of an insulator having a front surface for supporting said focusing electrode at a predetermined position and a first depression for accommodating said anode, wherein
said first depression is defined by a bottom surface for supporting said anode at a predetermined position and a side surface which communicates said front surface to said bottom surface and which defines a distance between said focusing electrode and said anode.

7 more elements

Dependencies are inferred from the claim text.