JPH0673264B2 - Manufacturing method of anode electrode in light source display tube - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-screen display device, and more particularly to a light source display tube which constitutes a pixel of a color display device.

[Conventional technology]

When a large-screen display device is constructed by arranging single-color display tubes utilizing the light emission of the phosphor as one pixel in a matrix, there is a space at the connection portion of each single-color display tube, and it is difficult to improve the resolution. Higher resolution may result in higher cost.

Therefore, conventionally, for example, a composite type light source display tube disclosed in JP-A-62-10849 has been proposed.

3 and 4 are a front view and a sectional view taken along line IV-IV of the basic structure of the composite type light source display tube, and FIG. 5 is an exploded perspective view of a part thereof, in which R (red) is shown. , G (green)
2 shows the case where the phosphor screens each having one of the B and blue (B) phosphors as one pixel are arranged in a matrix of 3 × 3 pixels.

In these figures, reference numeral 1 denotes a vacuum envelope as a glass tube which is hermetically sealed by a front panel 2, a back plate 3 and a tubular side plate 4, and an inner surface of the front panel 2 has a three-color phosphor. Each of R, G, and B is applied as a unit pixel in a matrix to form a fluorescent display portion 5 including 3 × 3 pixel fluorescent screens 5R, 5G, and 5B. Here, phosphor screen 5R, 5G
The subscripts of 5B and 5B correspond to red (R), green (G) and blue (B), respectively.

Reference numeral 6 designates a plurality of accelerating anodes 6 ₁ , 6 ₂ arranged corresponding to the periphery of the respective fluorescent screens 5R, 5G and 5B of the fluorescent display section 5 ₁ .
Is an anode electrode group consisting of ..., These acceleration anodes 6 ₁ , 6 ₂
A high voltage is applied to ... via the external terminal 16.

Reference numeral 7 denotes a cathode electrode group in which electron emission cathodes 7 _{11 to} 7 ₃₃ (not shown) are independently arranged in correspondence with the respective fluorescent screens 5R, 5G, 5B of the fluorescent display unit 5. 7
_{11-7 33} a pair of support 17a, each of the both ends are fixed on the rear plate 3 is supported between 17b. Here cathode 7
The 1st and 2nd subscripts of _{11 to} 7 ₃₃ are 1 to 3 respectively
It corresponds to the rows and the first to third columns.

Note that the cathodes 7 _{11-7 33,} for example, a straight thermal which was coated an oxide indirectly heated or tungsten was coated with oxide on the Ni sleeve can be used.

Reference numeral 8 is a grid electrode group including row selection control bridges 8 ₁ to 8 ₃ arranged between the cathode electrode group 7 and the fluorescent display portion 5, and these control grids 8 ₁ to 8 ₃ include ,
The electron beams 11 from the cathodes 7 _{11 to} 7 ₃₃ are arranged in the row direction corresponding to the respective fluorescent screens 5R, 5G and 5B of the fluorescent display portion 5.
The electron passing holes 9 _{1 to} 9 ₃ are provided to pass the beam as a non-focused beam.

10 is the back side of the cathode electrode group 7, that is, the vacuum envelope 1
On the back plate 3 forming a part of the strip display, corresponding to the respective fluorescent screens 5R, 5G and 5B of the fluorescent display section 5 and arranged in the column direction so as to be opposed to each other in a striped manner. ₁ ~ 1
This is a back electrode group consisting of 0 ₃ and these back electrodes 10 ₁ to 10 ₃
Is formed of a conductor layer such as Ag.

Then, each of the back electrodes 10 ₁ to 10 _3, each cathode 7 _11-7
By applying a positive potential of the negative and 0V or several V with respect to ₃₃ of the potential, which is intended to control the electron beam 11 to be emitted from their cathode 7 _{11-7 33.}

Reference numeral 12 is a lead wire as an external terminal for drawing out each electrode of the cathode electrode group 7, the grid electrode group 8 and the back electrode group 10 from the back plate 3.

Next, the operation will be described. First, the back electrode 10 ₁ to 10 ₃
When the negative electrode relative to the potential of but cathode 7 _{11-7 33,} because around these cathode 7 _{11-7 33} is surrounded by a negative potential, electrons from the cathode 7 _{11-7 33} control grid
8 ₁ to 8 ₃ and the accelerating anodes 6 ₁ , 6 ₂ , ..... do not flow to the cut-off state.

Therefore, the addition of positive potential of 0V or several V relative to the potential of the cathode 7 _{11-7 33} to the back electrode 10 ₁ to 10 _3, the electron beam 11 emitted from the cathodes 7 _{11-7 33} control grid It flows toward 8 ₁ to 8 ₃ .

At this time, the potential of each control grid 8 ₁ to 8 ₃ is changed to the cathode.
When the potential is negative with respect to 7 _{11 to} 7 ₃₃ , these control grids are
The electron beam 11 cannot pass through the electron passage holes 9 _{1 to} 9 _{3 of} 8 ₁ to 8 ₃ , and the electron beam 11 does not flow to the accelerating anodes 6 ₁ , 6 ₂ , ... The phosphor screens 5R, 5G, and 5B do not emit light.

Then, the potentials of the control grids 8 ₁ to 8 ₃ are changed to the cathodes 7 _{11 to} 7 _33.
On the other hand, when the potential is positive, the electron beams 11 pass through the electron passing holes 9 _{1 to} 9 _{3 of the} control grids 8 ₁ to 8 ₃ , respectively, and the respective fluorescent screens 5R, 5G, and 5B emit light.

Therefore, the control grids 8 ₁ to 8 _{3 of} the grid electrode group 8 and the back electrodes 10 ₁ to 10 _{3 of the} back electrode group 10 which are arranged in a matrix corresponding to the phosphor screens 5R, 5G, and 5B, respectively. By selectively controlling the drive (dynamic drive),
Only the fluorescent surfaces 5R, 5G, and 5B where the two electrodes intersect can be selectively caused to emit light.

As described above, three phosphor screens 5R, 5G, and 5B made of phosphors of three colors are provided on the inner surface of the front panel 2 constituting the vacuum envelope 1.
They are arranged in a matrix of × 3 pixels and each of these phosphor screens 5R, 5
By providing the cathode electrode group 7, the grid electrode group 8 and the back electrode group 10 corresponding to G, 5B, it is possible to obtain a display tube for a light source of high brightness light emission.

Therefore, when assembling a large-screen color display device using this light source display tube as one cell, the space between each pixel becomes narrower than that in the case where a single color tube with one pixel is used, and the resolution can be improved. ,
The number of parts and the number of manufacturing steps can be reduced. Further, not only the structure can be simplified and the cost can be reduced, but also the weight of the display device can be reduced.

In addition, in the illustrated example, the case where the phosphor surfaces made of R, G and B tricolor phosphors are arranged in a matrix of 3 × 3 pixels on the inner surface of the front panel 2 is shown, but the invention is not limited to this. In the vacuum envelope, phosphor screens each having one phosphor as one pixel are arranged in a matrix of arbitrary m × n pixels (where m and n are arbitrary integers), and a grid electrode group is arranged accordingly. The arrangement configuration of the back electrode group can be changed.

Further, each control grid of the grid electrode group 8 is formed into a channel shape having a U-shaped cross section, and a shield plate made of metal protruding laterally is attached to each of the control grids. There has been proposed a light source display tube in which electrons leaking from a gap are absorbed by the shield plate to effectively prevent pseudo light emission of a fluorescent screen due to leaking electrons (for example, Japanese Utility Model Application No. 62-114562).

Furthermore, for example, as disclosed in JP-A-62-241256 discloses an electronic pass portion formed on the respective control grids 8 _{1-8 3} by a dome-shaped mesh portion, the cathode 7
Together can be uniformly irradiated on the phosphor screen 5 uniformly spread the electrons emitted from _{11-7 33} can be arbitrarily adjusted divergence angle of the electron beam 11 in accordance with the curvature of the dome-shaped mesh portion.

Moreover, a display tube for a light source has been proposed in which the divergence angle of the beam increases as the curvature of the dome-shaped mesh portion increases, and the tube length of the display tube can be shortened.

Conventionally, as shown in FIG.
A cutting step of cutting a large number of elongated electrode materials 13 from a flat metal plate, and a processing step of providing the electrode material 13 with kerfs 14 at a depth of approximately 1/2 of the width in the width direction at substantially equal intervals, An assembly process for assembling a large number of electrode materials 13 at right angles to each other using the cut grooves 14 is provided, and the end portions 15 of each assembled electrode material 13 are bent at approximately 90 ° as shown by the chain line to Anode electrodes 6 are produced in a # -digit shape as shown in the figure.

[Problems to be Solved by the Invention]

The conventional method for producing the anode electrode in the display unit for the light source comprises the above steps, and it requires a large number of parts to produce the # -digit-shaped anode electrode, which may be troublesome and expensive to produce. there were.

The present invention has been proposed in view of the above, and an object thereof is to obtain a method for manufacturing an anode electrode that can be manufactured at low cost with a small number of processing steps.

[Means for Solving the Problems]

A method of manufacturing an anode electrode in a display tube for a light source according to the present invention is such that four corners of a metal plate are cut off, a bending line is formed on one side of the metal plate, and a groove is formed on the remaining three sides. An electrode piece manufacturing step of manufacturing a plurality of electrode pieces formed by processing
Cut and raise the electrode piece in the same direction from the bending line,
The method comprises the step of cutting and raising the electrode piece to form a double-digited electrode surrounding each of the plurality of fluorescent screens formed in a matrix by forming one double digit with four electrode pieces.

[Action]

The method for producing an anode electrode according to the present invention is such that a plurality of electrode pieces formed by cutting off four corners of a single metal plate, processing bending lines on one side, and processing grooves on the remaining three sides are formed. An electrode piece manufacturing step to be manufactured, and an electrode piece cutting and raising step of cutting and raising the electrode piece in the same direction from the bending line,
This makes it possible to obtain a # -digit-shaped anode electrode composed of a large number of electrode pieces inexpensively and highly accurately with a small number of processing steps.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, 18 is a rectangular metal plate, 19 is cutouts formed at the four corners of the metal plate 18, 20 is a bending line, 21 is a separation groove, and 22
Is a large number of electrode pieces surrounded by a groove 21 with one side being separated by a bending line 20 and the other three sides being separated, and these are made at the same time by an electrode piece making process using a known processing machine. Then, all of the electrode pieces 22 are bent in the same direction by a known bending machine as shown in FIG. 2 to form the # -digit-shaped anode electrode 6.

〔The invention's effect〕

As described above, according to the present invention, a plurality of electrode pieces formed by cutting off four corners of a single metal plate, processing bending lines on one side, and processing grooves on the remaining three sides are formed. Is manufactured and the electrode pieces are cut and raised in the same direction from the bending lines, so that the grid-shaped electrodes are manufactured. In addition, there is an effect that can be obtained with high accuracy.

[Brief description of drawings]

FIG. 1 is a plan view of an anode electrode according to an embodiment of the present invention during its production, FIG. 2 is a perspective view of the anode electrode after its production, and FIG. 3 is a front view of a light source display to which the anode electrode is applied. Fig. 4 is a transverse sectional view taken along the line IV-IV in Fig. 3, Fig. 5 is an exploded perspective view of a part thereof, Fig. 6 is an explanatory diagram of a conventional anode electrode manufacturing process, and Fig. 7 is It is a perspective view of the anode electrode produced by the production process. 1 is a vacuum envelope, 2 is a front panel, 3 is a back plate, 4 is a cylindrical side plate, 5 is a fluorescent display part, 5R, 5G and 5B are fluorescent screens, 6 is an anode electrode group, 7 is a cathode group, 8 Is a grid electrode group, 10 is a back electrode group, 18 is a metal plate, 19 is a cutout portion, 20 is a bent line,
21 is a separation groove, 22 is an electrode piece. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Kobayashi 700 Wada, Ueno Town, Ise City, Mie Prefecture Ise Electronics Industry Co., Ltd. (72) Mitsuru Masuda 700 Wada, Ueno Town, Ise City, Mie Prefecture Ise Electronics Industry (72) Inventor Zenichiro Hara 6-14 Maruo-cho, Nagasaki-shi, Nagasaki Mitsubishi Electric Corporation Nagasaki Works (72) Inventor Nobuo Terasaki 6-14 Maruo-cho, Nagasaki-shi, Nagasaki Mitsubishi Electric Corporation In Nagasaki Seisakusho (72) Inventor Shuji Iwata 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Sanryo Electric Co., Ltd. Applied Equipment Research Laboratory (56) Reference JP-A-62-10849 (JP, A) JP-A-SHO 58-20399 (JP, A)

Claims (1)

[Claims] 1. A method of manufacturing an anode electrode in a display tube for a light source, wherein a plurality of electrodes are formed in a grid pattern so as to surround a plurality of fluorescent screens formed in a matrix on the inner surface of a front panel of a vacuum envelope. , Cutting off four corners of one metal plate, and processing a bending line on one side of the metal plate,
An electrode piece manufacturing process of manufacturing a plurality of electrode pieces formed by processing grooves on the remaining three sides, and cutting and raising the electrode pieces in the same direction from the bending line, and one electrode girder is formed by four electrode pieces. A method of manufacturing an anode electrode in a display tube for a light source, which comprises: forming and forming a double-sided electrode that surrounds each of the plurality of fluorescent screens formed in a matrix. .