Electric lamp and discharge devices – Cathode ray tube – Envelope
Reexamination Certificate
2001-05-04
2004-05-18
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Envelope
C313S461000, C313S043000, C313S478000, C313S479000, C313S482000, C348S836000, C348S843000
Reexamination Certificate
active
06737796
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a mounting apparatus for a cathode-ray tube and more particularly to a mounting apparatus for providing self-alignment and cabinet size reduction.
BACKGROUND OF THE INVENTION
A cathode-ray tube, such as a color picture tube, has a glass envelope that comprises a neck, a funnel and a face-plate panel. The face-plate panel includes a viewing face-plate that is surrounded by a peripheral side wall. When a cathode-ray tube is evacuated to a very low internal pressure, it is subjected to the possibility of implosion caused by the stresses produced on the tube envelope by atmospheric pressure. In order to reduce the possibility of implosion, as well as to reduce the effects of an implosion should it occur, a tension band usually is applied externally to the face-plate panel side wall. Such a tension band applies compressive forces to the side wall which redistribute the stresses in the face-plate panel.
As known in the art and shown in
FIG. 1
, mounting lugs
16
, integral with, attached to, or disposed between the band
14
and the tube side wall, are used to support the tube
22
within a cabinet
10
. Typically, the mounting lugs
16
are positioned at the corners of the tube
22
because they are dependent on the tension of the band in the corners of the tube to provide the force to hold them in place. However, set designers have found this mounting technique to be somewhat undesirable, because the internal size of a cabinet
10
must accommodate the tube
22
plus the mounting lugs
16
, which adds from about 5-9 cm. to the overall dimensions of the tube
22
. Due to thermal expansion characteristics of the tube and known tension bands
14
, mounting lugs
16
and holes formed therein are formed larger than necessary to accommodate size and portion variations due to the thermal expansion during tube processing. Dimensioning these components to be larger contributes to increasing overall dimensions of the mounting system and set.
In assembly, a tube
22
having the tension band
14
and lugs
16
applied, is placed over an opening in a bezel
10
face down and the mounting lugs openings are aligned with bolts or studs
20
in the bezel
10
. Such an alignment technique requires manual intervention to align the lugs
16
with the openings in the bezel
10
. Set designers have expressed a desire for a mounting technique that would decrease the dimension of the mounting system, so that a trimmer visual appearance could be achieved. Set designers have also expressed a desire for a simpler more automated mounting technique that would allow the tube to be easily aligned within the set opening or bezel. The present invention provides mounting means, which permits a reduction in the size of the cabinet as well as a simple self-alignment apparatus for mounting the cathode-ray tube into the cabinet.
SUMMARY OF THE INVENTION
The present invention provides an improvement in the mounting of a cathode-ray tube within a bezel. The cathode-ray tube includes a unitary shellbond frame having integral mounting lugs which are positioned at locations either in the corners or off of the corners. The mounting lugs are formed with tapered sections along a depth dimension to allow a tube having the shellbond frame applied to be simply lowered into a bezel having lug receiving recesses of a complimentary shape. The tapered lug and complimentary lug receiving recess provides self-alignment of the tube before it is secured to the bezel.
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patent: 4899080 (1990-02-01), Vriens et al.
patent: 4949008 (1990-08-01), Chihara
patent: 5270826 (1993-12-01), Fowler
patent: 5459527 (1995-10-01), Lin
patent: 5699132 (1997-12-01), Adachi et al.
patent: 5742360 (1998-04-01), Kwon et al.
patent: 6124901 (2000-09-01), Diven et al.
Opresko Stephen Thomas
Swank Harry Robert
Harper Holly
Herrera Carlos M.
Laks Joseph J.
Thomson Licensing S. A.
Tripoli Joseph S.
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