Tubular light bulb device

Details Tubular light bulb device Tubular light bulb device

2001-08-28

2003-08-19

Husar, Stephen (Department: 2875)

Illumination

Light source and modifier

With ventilating, cooling or heat insulating means

C362S216000, C362S260000, C362S373000, C362S264000

Reexamination Certificate

active

06607290

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a tubular light bulb device. More specifically, the present invention relates to a tubular light bulb device where a fluorescent lamp and a lighting circuit are provided in a case and a globe.
2. Related Background Art
Conventional tubular light bulb devices include a bulb-type fluorescent lamp. As shown in
FIG. 6
, a bulb-type fluorescent lamp includes an envelope
3
composed of a globe
1
and a resin case
2
, where a fluorescent tube
4
, a lighting circuit
5
for lighting the fluorescent tube
4
, and a base
7
of, for example, the E26 type, attached to one end of the case
2
are provided. The lighting circuit
5
is housed in the case
2
. Further, the lighting circuit
5
includes a circuit board
5
a
and electronic parts
5
b
mounted on the circuit board
5
a.
However, the conventional bulb-type fluorescent lamp structure is not ideal for dissipating heat. The fluorescent tube
4
and the lighting circuit
5
both generate heat. Due to the sealed structure of the case
2
, heat permeates a space formed in the case
2
. As a result, the electronic parts
5
b
used in the lighting circuit
5
and even a phosphor film (not shown) applied to an inner face of the fluorescent tube
4
may be damaged by heat, thus decreasing lamp life.
SUMMARY OF THE INVENTION
The invention provides a tubular light bulb device that discharges heat in a space formed in a case to the outside to reduce temperature, thereby increasing bulb life.
In some embodiments, a tubular light bulb device of the invention includes an arc tube, a lighting circuit for lighting the arc tube, and a case housing the lighting circuit and having a base at one end, and a heat-transferring member disposed in the case for conducting heat from a space formed in the case to the base.


REFERENCES:
patent: 4363083 (1982-12-01), Tanaka et al.
patent: 5720548 (1998-02-01), Geary
patent: 6204602 (2001-03-01), Yang et al.

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