Fluorescent lamp module structure

Details Fluorescent lamp module structure Fluorescent lamp module structure

2001-01-03

2002-09-17

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

Reexamination Certificate

active

06452327

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a fluorescent lamp module structure, and more particularly, relates to a combined metallic housing which contains and positions a Cold Cathode Flat Fluorescent Lamp (CCFFL), and does not affect the distribution of its electrical field after the fluorescent lamp module structure is assembled, and also improves its luminance uniformity.
BACKGROUND OF THE INVENTION
FIG. 1
is an exploded view of the fluorescent lamp module structure according to the prior art. As shown in
FIG. 1
, the fluorescent lamp module structure of the prior art includes a CCFFL
10
and an integrated metallic housing
20
.
The CCFFL
10
being a rectangular box with certain thickness, includes a 1
st
side
11
on the top, a 2
nd
side
13
on the bottom, a 3
rd
side
15
on the left and a 4
th
side
17
on the right. The 1
st
side includes a 1
st
end
12
on the left, a 2
nd
end on the right, and a middle section between the 1
st
end
12
and the 2
nd
end
14
. Furthermore, the 1
st
end
12
has a 1
st
electrode
22
, the 2
nd
end
14
has a 2
nd
electrode
24
, and the middle section
16
has an exhaust tube
26
.
The integrated metallic housing
20
is composed of a base plate
25
and a plurality of upright piece
28
bent upward at a right angle to the base plate
25
with a height that is close to the thickness of the CCFFL
10
for containing and positioning the CCFFL
10
.
The air in the sealed chamber (not shown) of CCFFL
10
is drawn out through the exhaust tube
26
and changed into inert gas or mercury vapor. Afterward, a high voltage is applied between the electrodes
12
and
14
to induce electrons jumping from one electrode to another making the electrons collides with gas molecules to excite the inert gas or mercury vapor in the sealed chamber so as to radiate ultraviolet light. In this way, the ultraviolet light can excite “the phosphor coating” coated on the interior wall of the CCFFL
10
and generate luminescence.
FIG. 2
shows the curves illustrating the effect on the uniformity of a flat lamp when an integrated metallic housing is added. As shown in
FIG. 2
, the abscissa represents ten samples of the flat lamp, and each sample has nine test points (not shown in the figure) showing the luminance of the uniformly distributed areas. In addition, the ordinate represents the luminescent uniformity. Each sample's luminescent uniformity is defined as the ratio in percentage value of the lowest illumination to the highest illumination of the same sample among the nine illumination test points.
Curve
2
a
shows the luminescent uniformity of naked piece of the flat lamp before the integrated metallic housing
20
is added. Curve
2
b
shows the luminescent uniformity of the flat lamp after integrated metallic housing is added. From the curve
2
a
and
2
b
of the
FIG. 2
, we can see the luminescent uniformity of the CCFFL
10
of the fluorescent lamp module structure of the prior art is lowered in a great extent from an average of 90% before assembling to an average of 50% after assembling. This is due to the combination of the CCFFL
10
with the integrated metallic housing
20
that greatly affects the electric field.
SUMMARY OF THE INVENTION
In the light of the above-mentioned disadvantage of the prior art, the invention provides a fluorescent lamp module structure including a CCFFL and a combined metallic housing for containing and positioning the CCFFL. The CCFFL being a rectangular box with a certain thickness including a 1
st
side, a 2
nd
side, a 3
rd
side and a
4
th side. Furthermore, the 1
st
side includes a 1
st
end having a 1
st
electrode, a 2
nd
end having a 2
nd
electrode and a middle section having an exhaust tube.
In addition, the combined metallic housing is composed of a plurality of “metallic housing portions” cut from an integrated metallic housing. The integrated metallic housing is composed of a base plate and a plurality of upright piece bent upward at a right angle to the base plate with a height close to the thickness of the CCFFL. Moreover, a plurality of metallic housing portions is formed by a plurality of base plates, which are adjacent to one another, cut from the base plate of the integrated metallic housing. Thus, a plurality of metallic housing portions, adjacent to one another, can efficiently eliminate the effect on the electric field resulting from the adding of integrated metallic housing while the CCFFL is operating. It can restore the luminescent uniformity in a great extent, thereby, greatly improve the quality of the image display.
Regarding the invention's object, advantages and characteristics as above-mentioned or others can be better understood by the following “detailed description of the preferred embodiments”.

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