JP2943253B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for video equipment and a terminal device thereof.

2. Description of the Related Art A conventional image display device will be described with reference to FIG. In FIG. 4, 6 is a back electrode, 7a to 7d are linear cathodes as an electron beam source, 8 is an electron beam extraction electrode, 9 is a signal electrode, 10 is a first focusing electrode, 11 is a second focusing electrode 12 A and B are horizontal deflection electrodes and 13 and 13 are vertical deflection electrodes. These components are housed in a front glass container 14 and a rear metal container 1, and the inside of the containers 1 and 14 is evacuated. The linear cathodes 7a to 7d are stretched in the horizontal direction so as to generate an electron current having a substantially uniform current density distribution in the horizontal direction. , 7a, 7b, 7c, 7d) are provided). These linear cathodes 7a to 7d are formed by coating a surface of a tungsten wire with an oxide cathode material, for example. The back electrode 6 is made of a flat conductive material and is provided in parallel with the linear cathodes 7a to 7d. The extraction electrode 8 is opposed to the back electrode 6 via the linear cathodes 7a to 7d, and is formed of a conductive plate having rows of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each linear cathode. . The through-hole 15 is circular in the present embodiment, but may be elliptical or rectangular, or may be a slit like the lead electrode of the above-described conventional embodiment. The signal electrode 9 includes a row of a plurality of vertically elongated conductive plates 17 arranged at predetermined positions at positions opposed to each of the through holes 15 in the extraction electrode 8 in the horizontal direction at predetermined intervals. Has a similar through-hole 16 at a position facing the through-hole 15 of the extraction electrode 8. The shape of the through hole 16 may be elliptical or rectangular. Further, like the signal electrode of the above-described conventional embodiment, a vertically elongated slit-like electrode may be used. The first focusing electrode 10 is formed of a conductive plate having a through hole 18 at a position facing the through hole 16 of the signal electrode 9. The shape of the through hole 18 may be a circle, an ellipse, or a slit. The second focusing electrode 11 has a slit hole 19 vertically connected to a position facing the through hole 18 of the first focusing electrode 10. The shape of the slit hole 19 may be a round hole, an ellipse, or a rectangle like the through hole 18 of the first focusing electrode 10. Horizontal deflection electrode 12
A and B are composed of two conductive plates 21 and 22 connected at the end of a comb-like shape, which are meshed with each other via an appropriate space on the same plane, and are provided with horizontal deflection electrodes 12A and 12B. The space 20 formed therebetween faces the through slit hole 19 of the second focusing electrode 11. The vertical deflection electrodes 13a and 13b, as shown at 23 and 24, engage the conductive plates connected at the ends, i.e., two comb-like conductive plates on the same plane at appropriate intervals. For example, for the electron beam 25, the lower conductive plate 23 and the upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 is configured by applying a phosphor 27 that emits light by irradiation with an electron beam to the inner surface of the glass container 14 and adding a metal back layer (not shown) thereon.

The operation of the image display device configured as described above will be described.

First, a voltage V ₁ is applied to the back electrode 6 and a voltage V ₂ higher than V ₁ is applied to the extraction electrode 8. Further heating the linear cathodes, by applying a V ₁ <V ₀ <suitable voltage V ₀ to be V ₂ under a stream of heater current to facilitate electron emission line cathode 7 b, the line cathode surface Is positive, an electron flow is emitted and accelerated toward the extraction electrode 8. Also, for example
By applying a V _0> V ₂ becomes the voltage V ₀ to the line cathode 7 b, the electric field of the linear cathodes surface can be suppressed negative and become electron emission. Therefore, by individually controlling the voltage of the line cathode, the electron beam is repeatedly emitted from the upper line cathode 7a in the order of 7b, 7c,. A sheet-like electron beam having a uniform current density distribution in the direction can be generated. Next, the above-mentioned sheet-like electron beam is divided into a plurality of pieces in the horizontal direction by the through-holes 15 of the extraction electrode 8, and reaches the through-holes 16 of the signal electrode 9 as a large number of electron beam rows.
At this time, if the voltage V ₃ of the signal electrode 9 is V ₃ > V ₀ , the electron beam passes. If V ₃ <V ₀ , the electron beam loses kinetic energy and cannot pass. Therefore, by time control of the V _3, to adjust the electron beam passing amount each electron beam individually in accordance with a video signal for displaying picture elements.

The electron beam that has passed through the signal electrode 9 is then turned to a first focusing electrode.
10, after reaching the second focusing electrode 11, being focused and shaped by the electrostatic lens effect of the through hole 18 and the slit hole 19, between the adjacent conductive plates of the horizontal deflection electrodes 12a and 12b and vertical deflection. Electrostatic deflection is performed horizontally and vertically by a potential difference (referred to as a deflection voltage) provided between the adjacent conductive plates 23 and 24 of the electrodes 13a and 13b. Further, a high voltage (for example, 10 KV) is applied to the metal back layer of the screen 26, and the electron beam is accelerated to a high energy and collides with the metal back, causing the phosphor to emit light.

When the television image is divided vertically and horizontally into a matrix to form an aggregate of subsections 28, the electron beams separated as described above correspond to each subsection, and the electron beam is divided into subsections. By deflecting and scanning only within the minute, the entire screen can be projected on the screen. In addition, by controlling the RGB video signal corresponding to each picture element with time using the signal electrode voltage as described above, a television moving image can be reproduced.

Problems to be Solved by the Invention In such an image display device, as shown in FIG. 5, the linear cathode terminal 30 has an airtight terminal formed on the rear metal container 31 with the glass 33 interposed between the terminal 30 and the metal base 32, It is attached to the rear metal container 31 by welding from the inner side of the space formed by the front glass container 14 and the rear metal container 31 to enable terminals to be output. However, in such a configuration, the terminals
Due to the pitch accuracy error of 30, and the occurrence of bending, the rear metal container 31 and the terminal 30 conduct, and the image cannot be displayed.Moreover, in order to improve the adhesion between the terminal 30 and the glass 33, The terminal is treated with chromium oxide. There is also a problem that it is not possible to directly solder the terminal 30 subjected to the chromium oxide treatment.

The present invention has been made in view of the above problems, and provides an image display device in which conduction between a through hole of a rear metal container and a terminal is eliminated and solderability of the terminal is facilitated.

Means for Solving the Problems In order to solve the above problems, an image display device of the present invention has an insulator interposed between a terminal and a through hole of a rear metal container, and an outer surface side of the insulator. Is a metal welded to the terminal.

Function The present invention has the above-described configuration, and by interposing an insulator between the terminal and the through-hole of the rear metal container, the terminal and the rear metal container are electrically insulated, and an appropriate voltage is applied only to the terminal. Thus, a predetermined image can be displayed. or,
By welding a metal to the chromium oxide-treated terminal, solderability between the terminal and the drive circuit board is facilitated and conduction can be easily obtained.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an attached state of a line cathode terminal, a signal electrode terminal and other terminals to a rear metal container, FIG. 2 is a sectional view showing an attached state of a line cathode terminal, and FIG. FIG. 3 is a cross-sectional view showing a mounting state of a signal electrode terminal. In FIG. 1, 35 is a rear metal container, and 36 is a linear cathode terminal. As shown in FIG. 2 in an enlarged manner, the line cathode terminal 36 is integrated with a metal base 37 having a stepped portion and a flange via a glass 38, and all of the plurality of wire cathode terminals 36 are attached to the metal base 37. Have been. This ensures the mutual positional accuracy of the linear cathode terminals 36. The insulation between the wire cathode terminal 36 and the rear metal container 35 is maintained by the glass 38. In addition, airtightness is maintained by this structure. The wire cathode terminal 36 is positioned so as to penetrate it from the inside to the outside by making a hole 39 in the rear metal container 35.

The laser is applied to the flange of the integrated metal base 37.
By irradiating 40, the metal base 37 and the rear metal container 35 are melted. By forming the fusion part 41 on the entire circumference of the flange of the metal base 37, the linear cathode terminal 36 is adhered to the rear metal container 35, and the sealing property is maintained. A hole 39 between the terminal 36 and the rear metal container 35 is filled with an insulator 46 to insulate them. Further, welding is performed by inserting a metal 47 into the terminal 36. The line cathodes 7a to 7d shown in FIG. 4 are connected to the inner end of the line cathode terminal 36 directly or by a lead wire, and one outer end is connected to a drive circuit (not shown) via a metal 47. Connected by soldering. The terminals are attached to the rear metal container 1 from the inside of the space formed by the front glass container 14 and the rear metal container 1.

The signal electrode terminal 42 is the same as the line cathode terminal 36, as shown in FIG.
As shown in FIG. 3, it is integrated with a metal base 43 having a flange with a stepped portion via a glass 45, and all of the plurality of pieces are attached to the metal base 43. Similarly to the line cathode terminal 36, the signal electrode terminal 42 is
By drilling a hole 39 in 35, it is positioned so as to penetrate it from inside to outside. The metal base 43 and the rear metal container 35 are melted by laser irradiation, and a molten portion is formed all around the metal base 43, whereby the signal electrode terminal 42 is adhered to the rear metal container 35 and the sealing property is maintained. Will be. The hole 39 between the terminal 42 and the rear metal container 35 is filled with an insulator 46 to be insulated. Furthermore, terminals
Welding is performed by inserting metal 47 into 36. According to this configuration, the terminal 36 and the rear metal container 35 do not conduct, and the metal 47 is inserted and welded to the terminal 36, so that soldering to the drive circuit becomes possible.

Effect of the Invention As described above, the present invention attaches at least the line cathode terminal and the signal electrode terminal to the rear metal container from the inside of the container, and adheres the metal base integral with the terminal to the rear metal container by welding. In addition, since an insulator is interposed in the hole between the terminal and the rear metal container, electrical insulation between the terminal and the rear metal container is facilitated, good image display is possible, and display defects do not occur. Furthermore, since the metal is welded to the terminal, soldering with the drive circuit board becomes possible, a drive voltage can be easily applied, and an image display device with reduced cost can be provided. .

[Brief description of the drawings]

FIG. 1 is a plan view showing an attached state of a line cathode terminal, a signal electrode terminal, and other terminals to a rear metal container of an image display device according to an embodiment of the present invention, and FIG. 2 is a line cathode terminal of the device. FIG. 3 is a sectional view showing an attached state of the signal electrode terminal of the device, FIG. 4 is an exploded perspective view showing a basic structure of the image display device, and FIG. It is sectional drawing which shows the attachment state of a back surface container and a wire cathode terminal. 35: Rear metal container, 36: Wire cathode terminal, 37, 43: Metal base, 38, 45: Glass, 39: Hole, 40: Laser, 41: Fused portion, 42: Signal electrode Terminals, 44: Other terminals, 46: Insulator, 47: Metal.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-56-38750 (JP, A) JP-A-61-179043 (JP, A) JP-A-3-141542 (JP, A) JP-A-60-38 100336 (JP, A) JP-A-55-59640 (JP, A) JP-A-58-116862 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 31/00-31 / 24 H01J 9/00-9/18 H01J 29/90

Claims (2)

(57) [Claims] 1. A flat screen coated with a phosphor,
A back electrode made of a conductive plate facing the screen, and a line cathode, a beam extraction electrode, a signal electrode, a focusing electrode, and a horizontal deflection electrode in a space interposed between the back electrode and the screen in order from the back electrode. And a front-side glass container and a rear-side metal container that house the screen, the line cathode, and the various electrodes in a vacuum state, and at least the line cathode terminal and the signal electrode terminal are connected to a metal base via glass. The image display device, wherein the line cathode and the signal electrode terminal are respectively taken out in such a manner that the metal base is fixed and welded to the rear metal container and the rear metal container is penetrated from the inner surface of the rear metal container. An image display device, wherein an insulator is interposed so as to be located between the terminal and the through hole. 2. The image display device according to claim 1, wherein a metal is welded to a terminal on an outer surface side of said insulator.