Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Reexamination Certificate
1999-07-14
2001-10-16
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
C313S407000, C313S408000, C313S47700R
Reexamination Certificate
active
06304025
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure for fastening a flat Braun tube to a cabinet, and more particularly, to an improved structure for fastening a flat Braun tube to a cabinet, which can prevent damage to a panel and reduce assembly working-hours.
2. Background of the Related Art
The Braun tube(a cathode ray tube) is used in a TV receiver or a display, and particularly, the flat Braun tube becomes popular recently because the flat Braun tube is advantageous in that a distortion of image can be reduced in comparison to a curved surfaced Braun tube, resulting to provide an image close to an actual image.
Referring to
FIG. 1
, the flat Braun tube is provided with a rectangular frame of a rail
2
attached on an inside surface of a flat panel
1
, and a mask
3
having a plurality of slits bonded to the rail
2
under tension. And, there are a funnel
4
of a bulb form with a neck portion
4
a
at rear thereof bonded to a periphery of the inside surface of the panel
1
, an electron gun
5
sealed in the neck portion
4
a
for emitting electron beams for red, green, and blue colors, and deflection yokes
6
on outer circumference of the neck portion
4
a
adapted to form vertical/horizontal uniform magnetic fields for deflection of the electron beams. As shown in
FIGS. 2 and 3
, the foregoing flat Braun tube is encased in front/rear cabinets
7
and
8
, and the flat Braun tube
9
and the front cabinet
7
are fastened together by a compression band
10
. The compression band
10
, formed of a metal which expands and contracts on heating/cooling, has a rectangular form in overall. There is a lug
11
at each corner of the compression band
10
for fastening to the front cabinet
7
. In order to fasten the compression band
10
and the panel
1
, at first adhesive tape
12
is attached on an outer circumference of the panel
1
, the compression band
10
is heated to lengthen an inner circumference of the compression band
10
longer than at least the outer circumference of the panel
1
. Then, the panel
1
with the adhesive tape
12
attached thereto is inserted inside of the compression band
10
and cooled down at a room temperature, to leave the compression band
10
shrink around the outer circumference of the panel
1
, thereby fastening the compression band
10
and the panel
1
. In the meantime, the panel
1
with the compression band
10
fastened thereto is fastened to the front cabinet
7
by bringing the lugs
11
at four corners of the compression band
10
into a close contact with an inside of the front cabinet
7
, and fastening the compression band
10
and the front cabinet together by means of fastening means, such as screws. For reference, the adhesive tape
12
attached along the outer circumference of the panel
1
acts as an insulator which prevents transmission of a high temperature of about 400° C. applied in lengthening the compression band
10
to the outer circumference of the panel
1
directly, strengthens the adhesive force between the panel
1
and the compression band
10
as the adhesive tape
12
is melt by the heat applied to the compression band
10
, and prevents the outer circumference of the panel
1
from being damaged and broken by the compression band
10
.
However, the structure for fastening a flat Braun tube to a cabinet by means of the related art compression band
10
has the following problems.
First, in a case the lengthening of the compression band
10
is inadequate, with the outer circumference of the panel
1
being equal to or greater than the inner circumference of the compression band
10
, a forced insertion of the compression band
10
to inside of the panel
1
may cause breakage of a corner of the panel
1
, which is relatively weak. And, the forced insertion of the compression band
10
to inside of the panel
1
may push the adhesive tape
12
away from the outer circumference. Opposite to this, an excessive lengthening of the compression band
10
over a limit of the lengthening causes a poor fastening with the panel
1
due to a limit in contraction.
Second, the panel
1
, under an excessive contraction, is contracted together with the compression band
10
at cooling down the compression band
10
, to deteriorates landing or explosion proof characteristics of the flat Braun tube. Particularly, as shown in
FIG. 4
, in a case of an 22″ panel
1
, it is found that the panel
1
is deformed inwardly by approx. 6 mils(=152 &mgr;m) at evacuation of the flat Braun tube, which becomes serious with a deformation ratio of 10% when the compression band
10
is contracted.
Third, the fastening of the compression band
10
with the panel
1
which requires heating the compression band
10
, to lengthen the compression band
10
, cooling the compression band
10
for compression onto the panel
1
has a problem of requiring many working-hours.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to an improved structure for fastening a flat Braun tube to a cabinet that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an improved structure for fastening a flat Braun tube to a cabinet, which does not deteriorate characteristics of a Braun tube and simplifies the assembly of the Braun tube and the cabinet.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the structure for fastening a flat Braun tube to a cabinet, includes a holding member for fastening to a portion of an outer circumference of the panel, and a lug fitted to the holding member for fastening to the cabinet.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: A55146849 (1980-11-01), None
patent: A57194441 (1982-11-01), None
LG Electronics Inc.
Patel Vip
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