Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Reexamination Certificate
1999-08-09
2001-08-21
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
C313S495000, C313S496000, C313S422000
Reexamination Certificate
active
06278235
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a flat-type display apparatus used for a television receiver, a computer-terminal display unit, or the like.
BACKGROUND ART
A flat-type display apparatus in which images, characters, and the like are displayed with high precision in the following manner has been developed. The flat-type display apparatus comprises electron beam sources and a flat electrode unit in which a plurality of electron-beam control electrodes are layered. After being focused, modulated, and deflected by the electrode unit, electron beams are further focused by wire electrodes formed by extending a plurality of wires and then are irradiated onto a phosphor screen to cause light emission.
A conventional flat-type display apparatus will be explained with reference to
FIG. 2
as follows.
A conventional flat-type display apparatus
101
comprises a back electrode
106
, a plurality of linear hot cathodes
107
as electron beam sources, a flat electrode unit
108
, and a grid frame
110
to which wire electrodes
109
as extended electrodes have been fixed while being extended thereon orthogonally to the linear hot electrodes
107
, which are housed in a vacuum case
105
. The vacuum case
105
is formed of a front case
103
having a phosphor screen
102
formed on its inner face and a rear case
104
.
In this case, the electrode unit
108
comprises an extracting electrode
111
, a modulating electrode
112
, a horizontal deflection electrode
113
, and a vertical deflection electrode
114
. The respective electrodes are electrically insulated from and are fixed to one another while maintaining predetermined spaces.
In order to facilitate the following description, the coordinate axes are set as follows.
An X-axis is set in the direction in which the linear hot cathodes
107
are extended. A Y-axis is set in the direction orthogonal to the X-axis in a plane of the back electrode
106
. A Z-axis is set in the normal direction from the back electrode
106
toward the phosphor screen
102
.
The back electrode
106
is fixed by welding or the like to fixing stands
115
that have been fixed to the rear case
104
with low melting point solder glass or the like. Springs
116
for extending the linear hot cathodes
107
are fixed by welding or the like to bases
117
that have been fixed to the rear case
104
with low melting point solder glass or the like. The linear hot cathodes
107
are extended by the springs
116
on the phosphor screen
102
side of the back electrode
106
with a predetermined tension.
Electrode fixing metal fittings
118
have insulating films
118
a
formed on its phosphor screen
102
side and are placed on the back electrode
106
at the upper and lower ends in the Y-axis direction.
End metal fittings
119
are fastened to the electrode unit
108
at the left and right ends in the X-axis direction using screws or the like with insulating spacers
120
being sandwiched therebetween, which is then fixed to the electrode fixing metal fittings
118
.
In the extracting electrode
111
, through holes
111
a
are formed opposing respective linear hot cathodes
107
at predetermined spaces in the X-axis direction.
The modulating electrode
112
is formed in a bamboo-blind-like shape by placing long and narrow electrodes
112
b
in the Y-axis direction in the X-Y plane at suitable spaces from one another corresponding to the pitch of the through holes
11
a
in the X-axis direction in the extracting electrode
111
. The electrodes
112
b
have through holes
112
a
at the positions opposing the rows of through holes
111
a
along the Y-axis in the extracting electrode
111
.
The horizontal deflection electrode
113
is formed by combining comb-teeth-shaped electrodes
113
a
and
113
b
with each other at suitable spaces in the same plane (in the X-Y plane). The electrodes
113
a
are connected to each other at their left and/or right ends in the X-axis direction and the electrodes
113
b
also at their left and/or right ends in the X-axis direction. The horizontal deflection electrode
113
is placed so that the center positions of slits
113
c
formed between projecting parts
113
ab
and
113
bb
that are combined with each other correspond to respective positions of the through holes
111
a
in the extracting electrode
111
.
The vertical deflection electrode
114
is formed by combining comb-teeth-shaped electrodes
114
a
and
114
b
with each other at suitable spaces in the same plane (in the X-Y plane). The electrodes
114
a
are connected to each other at their left and/or right ends in the X-axis direction and the electrodes
114
b
also at their left and/or right ends in the X-axis direction. Slits
114
c
are formed between the electrodes
114
a
and
114
b
in the X-axis direction at the positions corresponding to the positions of the linear hot cathodes
107
.
The wire electrodes
109
are formed by extending and fixing wires
109
a
to the picture-frame-like grid frame
110
at the positions opposing the rows of the through holes
111
a
along the Y-axis in the extracting electrode
111
so as to correspond to the pitch of the through holes
111
a
in the X-axis direction in the extracting electrode
111
.
The grid frame
110
is fixed to the end metal fittings
119
using screws or the like with insulating spacers
121
being sandwiched therebetween. In this case, the grid frame
110
and the end metal fittings
119
are fixed using screws with insulating bushings
122
being sandwiched therebetween so as to be insulated electrically from each other.
Then, the front case
103
is placed over the structure comprising members from the back electrode
106
to the wire electrodes
109
that have been placed on the rear case
104
as described above. The front case
103
and the rear case
104
are fixed to each other by heating with outgoing terminals (not shown in the figure) being sandwiched therebetween using low melting point solder glass formed at the peripheries of the front case
103
and the rear case
104
, thus being sealed to obtain the vacuum case
105
. Then, the inside of the vacuum case
105
is evacuated through an exhaust pipe (not shown in the figure). The exhaust pipe is then closed, thus completing the flat-type display apparatus
101
.
In this case, the front case
103
is placed by positioning stripes formed in the Y-axis direction constructing the phosphor screen
102
formed on the inner face of the front case
103
relative to the wires
109
a
forming the wire electrodes
109
with respect to the X-axis direction.
The flat-type display apparatus
101
thus formed displays images, characters, and the like with high precision by: focusing, modulating, and deflecting electron beams
123
generated from the linear hot cathodes
107
by the extracting electrode
111
, the modulating electrode
112
, the horizontal deflection electrode
113
, and the vertical deflection electrode
114
that form the electrode unit
108
; further focusing the electron beams
123
by the wire electrodes
109
; and irradiating the electron beams
123
onto the phosphor screen
102
to cause light emission.
However, in order to display images, characters, and the like with high precision excellently without causing shifts in color in the conventional flat-type display apparatus, the wire electrodes
109
and the stripes forming the phosphor screen
102
must be positioned with a precision within ±15 &mgr;m.
In the conventional configuration, the stripes of the phosphor screen
102
formed on the inner face of the front case
103
are positioned relative to the wire electrodes
109
fixed to the rear case
104
with respect to the X-axis direction. In this stage, the wire electrodes and the stripes are positioned with a precision within ±10 &mgr;m in the X-axis direction.
However, in a later process, the rear case
104
and the front case
103
are fixed to each other by heating with low melting point solder glass with the outgoing terminals (not shown in the figure) being sandwiched therebetween.
In this process, the
Fujishiro Kenji
Inada Makoto
Kanehisa Takashi
Nakatani Toshifumi
Matsushita Electronics Corporation
Merchant & Gould P.C.
Patel Vip
Quarteman Kevin
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