US 2010/0134004 A1Published application

Hot-cathode fluorescent lamp

OwnerShiro Otake, Teruaki Shigeta +1inventors

InventorsShiro Otake, Teruaki Shigeta, Nobuhiro Shimizu

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Abstract

The present invention provides a hot cathode discharge lamp comprising an electrode that has a filament coil, a first and a second connection-reinforcing members (5a) and (5b), a first and a second lead-in wires (6a) and (6b), the filament coil including: a coil part (4a); a first lead wire (4b) connected to the first lead-in wire (6a) via the first connection-reinforcing member (5a); and a second lead wire (4c) connected to the second lead-in wire (6b) via the second connection-reinforcing member (5b), wherein a first plane of the first connection-reinforcing member (6a) and a second plane of the second connection-reinforcing member (6b) intersect with each other. According to this structure, the filament is more resistant to swinging and is more stably fixed than the filaments of the conventional lamps, even if the filament is extended in the direction of the tube axis in order to extend the lamp life.

Claims6

Dependent claims

A hot cathode discharge lamp including an electrode, the electrode having a filament coil, a first connection-reinforcing member, a second connection-reinforcing member, a first lead-in wire, and a second lead-in wire, the filament coil including:

a coil part to which an emitter is attached;
a first lead wire that extends from one of two ends of the coil part, and is connected to the first lead-in wire via the first connection-reinforcing member;
and
a second lead wire that extends from an other one of the two ends of the coil part, and is connected to the second lead-in wire via the second connection-reinforcing member, wherein
the first lead-in wire and the second lead-in wire supply electric power from an external power source,
the coil part is a multiple-coiled coil,
an axis of a most external winding of the coil part is identical or substantially parallel to a tube axis of the lamp, the most external winding having a widest winding diameter among windings in the multiple-coiled coil,
each of the first connection-reinforcing member and the second connection-reinforcing member includes a main structure having a flat-plate shape, and
a first plane and a second plane intersect with each other, the first plane being an imaginary plane that is expanded from a major surface of the main structure of the first connection-reinforcing member, and the second plane being an imaginary plane that is expanded from a major surface of the main structure of the second connection-reinforcing member.

6 more elements

Dependencies are inferred from the claim text.