Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-06-25
2004-06-29
Lea-Edmonds, Lisa (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C348S822000, C348S826000, C348S836000, C313S47700R, C312S223100
Reexamination Certificate
active
06757158
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to cathode ray tubes (CRTs) and, more particularly, to a mounting lug for mounting the CRT to a cabinet.
BACKGROUND OF THE INVENTION
Shown in
FIG. 1
is a conventional cathode ray tube
10
(CRT) having an evacuated glass envelope
32
including a substantially rectangular faceplate panel
30
and a tubular neck
34
connected by a funnel
22
. An electron gun (not shown) is mounted within the tubular neck
34
and is designed to be used with an external magnetic deflection yoke
42
positioned in the vicinity of the funnel-to-neck junction. The faceplate panel
30
has a peripheral flange or sidewall
12
that is sealed to the funnel
22
by a glass frit
38
.
An implosion resistant band
14
surrounds at least a portion of the sidewall
12
. One type of implosion resistant band
14
is a shrink fit band formed from a steel strip that is joined at the ends by a weld
36
. Before assembly, the periphery of the implosion resistant band
14
is initially slightly smaller than the periphery of the faceplate panel
30
. The implosion resistant band
14
is then heated to cause it to expand to a dimension that allows it to be fitted around the sidewall
12
of the faceplate panel
30
. As the implosion resistant band
14
cools, it shrinks to contact the sidewall
12
thereby applying a compressive force to the faceplate panel
30
. Although an implosion resistant band
14
in the form of a shrinkfit band is illustrated, alternatively, the implosion resistant band
14
may be a conventional tension band having ends fixed by a crimped closure.
Positioned at corners of the CRT
10
are mounting lugs
16
that affix the CRT
10
within a cabinet
18
adjacent to a substantially rectangular cabinet opening
46
. As shown in
FIG. 2
, each of the mounting lugs
16
typically has a mounting portion
26
positioned essentially perpendicular to a base portion
28
. The base portion
28
of the mounting lug
16
is attached to a surface
70
of the implosion resistant band
14
by a weld. The mounting lug
16
may optionally be integral with or disposed between the implosion resistant band
14
and the sidewall
12
of the faceplate panel
30
. The mounting portion
26
of the mounting lug
16
is provided with an aperture
44
to effectively couple the CRT
10
to a corresponding hole
48
in the cabinet
18
with an attachment member
20
such as a bolt, screw, etc. Because the mounting portion
26
is essentially perpendicular to the sidewall
12
of the faceplate panel
30
, the CRT
10
is coupled to the cabinet
18
along a Z-axis of the CRT
10
. The Z-axis is shown by the dashed lines in
FIGS. 1 and 2
.
The cabinet
18
includes speakers
24
, as best shown in FIG.
1
. Because most speakers
24
are installed to point towards the viewer, the speakers
24
are mounted in the cabinet
18
parallel to the Z-axis of the CRT
10
. Microphonic action associated with the speakers
24
creates vibrations in the cabinet
18
. Because the speakers
18
and the mounting lugs
16
are both mounted in the cabinet
18
along the Z-axis, vibrations along the Z-axis are coupled through the cabinet
18
to the mounting lugs
16
and finally to the CRT
10
. Such microphonic vibration coupling to the CRT
10
can cause undesirable anomalies in the picture due to electron beam misregister or component shifting within the CRT
10
. It is therefore desirable to develop a mounting lug
16
that will couple a CRT
10
to a cabinet along an axis other than parallel to the Z-axis to minimize microphonic vibration coupling to the CRT
10
.
SUMMARY OF THE INVENTION
This invention relates to a cathode ray tube (CRT) having an evacuated envelope including a substantially rectangular faceplate panel with a sidewall joined to a funnel and an implosion resistant band surrounding at least a portion of the sidewall in contact therewith. The CRT is mounted in a cabinet by a plurality of mounting lugs. The mounting lugs include a base portion attached to the implosion resistant band, an adjoining portion substantially perpendicular to the base portion, and a mounting portion positioned at an angle in respect to the adjoining portion. The mounting portion has an aperture for receiving a fastner for coupling the mounting portion to the cabinet.
REFERENCES:
patent: 3573368 (1971-04-01), Kober
patent: 3626093 (1971-12-01), Inglis
patent: 4390809 (1983-06-01), Mitchell et al.
patent: 4651256 (1987-03-01), Yamagishi
patent: 5270826 (1993-12-01), Fowler
patent: 5466984 (1995-11-01), Gotoh
patent: 5844635 (1998-12-01), Kim
patent: 6124901 (2000-09-01), Diven et al.
patent: 6417893 (2002-07-01), Heirich et al.
patent: 6437838 (2002-08-01), Swank et al.
patent: WO 02/061796 (2002-08-01), None
IBM Technical Disclosure Bulletin, “Crt Mounting Method for Single Part Bezels”, vol. 37, No. 1, Jan. 1994.
Japanese Patent Abstract, vol. 1999 No. 10, Aug. 31, 1999, & JP 11146303 A, May 28, 1999.
Andrevski Zygmunt Marian
Swank Harry Robert
Herrera Carlos M.
Laks Joseph J.
Lea-Edmonds Lisa
Thomson Licensing S. A.
Tripoli Joseph S.
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