JPH0812768B2 - Fixed structure of flat electrode in flat panel display - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat electrode fixing structure for a flat panel display of an image device.

2. Description of the Related Art In recent years, a flat-panel display device that displays a color television image using an electron beam has attracted attention. As shown in FIG. 4, the flat-panel display device converges and deflects the electron beam emitted from the electron beam source 1 by a plurality of flat plate-shaped electrodes 3 in the horizontal direction and the vertical direction, and each of them is displayed on the screen 5. Each of the phosphors applied to the section 4 is landed to display a television image.

In such a flat panel display device, as shown in FIG. 7, in order to fix a plurality of the flat plate electrodes a at a predetermined interval with good precision and insulation, the flat plate electrodes a,
A spacer c having an adhesive low-melting glass b applied to the surface of an insulator is interposed between a and heated to a melting temperature (usually about 500 ° C.) of the glass b under pressure to form a flat plate shape. Although the electrode a is fixed via the spacer c, the heating causes oxidation of the plate electrode a and thermal deformation, which disturbs the landing of the electron beam and significantly deteriorates the image quality.

In order to solve such a problem of the conventional example, the present inventor, in the previous application, presses the tapered insulating pins into the holes of the flat plate-shaped electrodes held at a predetermined interval, thereby making the spacer c ( A prior art has been proposed in which the flat plate-shaped electrodes are supported and fixed at a predetermined interval without interposing or heating (see FIG. 7).

However, in the above prior art, when the insulating pin is pressed into the hole of the flat electrode, the periphery of the hole is deformed. There is a drawback that the landing is disturbed and the image quality is easily lowered.

Also, each time the same place on the surface of the insulating pin passes through multiple holes, the peripheral edge of each hole is scraped by the insulating pin and becomes a metal powder that adheres to the surface of the insulating pin and short circuit easily occurs between the flat plate electrodes. Therefore, there is also a drawback that the electric breakdown voltage between the flat plate-shaped electrodes is likely to be lowered.

A first object of the present invention is to provide a flat surface capable of supporting and fixing a flat plate electrode without passing through a spacer or heating, and avoiding a situation in which the periphery of the hole of the flat plate electrode is deformed. An object of the present invention is to provide a fixed structure of a flat electrode in a flat panel display device.

A second object of the present invention is to provide a plate electrode fixing structure which does not cause a reduction in electrical withstand voltage between the plate electrodes due to the metal powder adhering to the surface of the insulating pin.

Means for Solving the Problems In order to achieve the first object, the invention according to claim 1 has a plurality of protrusions projecting inwardly from respective peripheral portions of holes formed coaxially in the plurality of flat plate electrodes. It is characterized in that each plate electrode is fixed by providing a piece and elastically contacting the protruding piece from the periphery with a tapered insulating pin inserted into these holes.

Further, in order to achieve the first and second objects, the invention according to claim 2 is such that, in the invention according to claim 1, the positions of the respective protruding pieces are set in the coaxially located holes of the adjacent plate-like electrodes. It is characterized by being slid around the axis.

According to the first aspect of the present invention, the insulating pin inserted in the hole of the flat plate-like electrode is elastically contacted with the projecting piece from the surroundings, so that the insulating pin can be brought out of contact with the peripheral edge of the hole. Therefore, it is possible to prevent the peripheral portion from being deformed, and it is possible to support and fix each flat plate electrode to the insulating pin via the projecting piece.

According to the invention of claim 2, in the invention of claim 1, when the insulating pin is inserted into the hole of each flat plate-like electrode, the metal powder generated by scraping the tip of the protruding piece is streaky in the insertion direction. Although the protruding pieces of the flat plate-shaped electrodes that are attached to the surface of the insulating pin contact the metal powder and may cause a short-circuit between the flat plate-shaped electrodes, they contact the protruding pieces in the holes of the insulating pin. By sliding the part around the axis, it is possible to avoid contact between the metal powder attached to the surface of the insulating pin by the protruding piece of the one plate-shaped electrode and the protruding piece of the other plate-shaped electrode. It is possible to avoid a decrease in electrical withstand voltage between the flat plate-shaped electrodes due to the metal powder adhered to the pin surface.

According to the first and second aspects of the present invention, the tapered insulating pins are press-fitted into the holes of the flat plate electrodes held at predetermined intervals, so that the flat plate electrodes can be spaced at predetermined intervals without heating via a spacer. Can be supported and fixed to.

Example A first example of the present invention will be described with reference to FIGS.

As shown in FIG. 4, the flat panel display device of this embodiment has
A rear electrode 2 is provided behind a linear cathode 1 as an electron beam source, and a beam extraction electrode, a signal electrode, a focusing electrode, and a horizontal deflection electrode as a flat electrode 3 for controlling an electron beam emitted from the linear cathode 1 are provided in front. , And a vertical deflection electrode, and a screen 5 coated with a phosphor 4 that is irradiated with an electron beam and emits red, green, and blue light, respectively, in each of the sections 4 divided in a vertical direction and a horizontal direction, It is arranged in a glass container (not shown) in a vacuum state.

In this embodiment, each flat plate electrode 3 of the focusing electrode, the horizontal deflection electrode, and the vertical deflection electrode is supported and fixed by inserting a ceramic insulating pin 6 into the hole 7 of the flat plate electrode 3. explain.

As shown in FIG. 2, a spacer 8 is inserted between the flat electrodes 3 to maintain the interval at a predetermined size. Reference numeral 9 is an electron beam passage portion of the flat electrode 3.

A hole 7 into which the insulating pin 6 is inserted is coaxially provided in each plate electrode 3. The hole 7 of the first plate-shaped electrode 3 in the insertion direction P of the insulating pin 6 among the plurality of plate-shaped electrodes 3
Will be described with reference to FIG. The diameter of hole 7 is 1.0 mm,
Projecting pieces 11 projecting inward from the peripheral portion 10 are provided at four locations. The width of the tip of the protruding piece 11 is about 0.1 to 0.2 mm,
The dimension between the tips of the projecting pieces 11, 11 facing each other is 0.76 mm. Further, a reinforcing portion 12 for reinforcing the strength of the peripheral edge portion 10 is provided so as to project inward between the adjacent protruding pieces 11, 11. Although the holes 7 of the second and subsequent flat plate electrodes 3 are formed to have a small diameter according to the taper shape of the insulating pin 6, the protruding amounts of the respective protruding pieces 11 are the same.

On the other hand, the diameter of the insulating pin 6 is 0.8 m at the base end.
m. The thickness is set to 2/3 or less of the width dimension of the portion of the plate electrode 3 where the hole 7 is provided. It has been confirmed by experiments by the present inventor that setting the thickness of the insulating pin 6 in this way can prevent the electric field near the insulating pin 6 of the electron beam passage portion 9 from being disturbed by the influence of the insulating pin 6. . As a result, the displacement of the landing position due to the disturbance of the electric field can be eliminated, and a uniform image can be obtained.

As shown in FIG. 2, the insulating pin 6 is pushed out by the press-fitting pin 13 and inserted into the hole 7 of each plate electrode 3. In each hole 7, the insulating pin 6 is brought into sliding contact with the tip of the protruding piece 11 to deform it in the insertion direction P. At this time, the insulating pin 6 is not in contact with the peripheral portion 10 of the hole 7, and only the protruding piece 11 is deformed, so that the peripheral portion 10 can be prevented from being deformed.

In this way, the flat plate-shaped electrode 3 is supported and fixed, and the spacers 8 are removed as shown in FIG. 1. Then, foreign matters such as dust remaining on the surfaces of the flat plate-shaped electrode 3 and the insulating pins 6 are blown with air or the like. It is possible to obtain a flat-panel display device by removing it, performing a withstand voltage test, and assembling.

5 and 6 show a second embodiment of the present invention. Since the overall configuration of the flat display device according to the present embodiment is the same as that of the first embodiment, the same reference numerals are given and the description thereof is omitted.

In this embodiment, as shown in FIG. 6, in the hole 7 located on the same axis z of the adjacent flat plate-shaped electrodes 3, the position of the projecting piece 11 projecting inwardly from the peripheral edge portion 10 is rotated around the axis z. To
The protrusions 11 are offset by 45 ° so that they do not coincide with each other in the axis z direction.

According to this embodiment, when the insulating pin 6 is inserted into the hole 7 of each flat plate electrode 3, the projecting piece 11 is brought into contact with the hole 7 of the first flat plate electrode 3 in the inserting direction P. Transform it. At this time, the metal powder 12 generated when the tip of the protruding piece 11 is scraped by the insulating pin 6 adheres to the surface of the portion of the insulating pin 6 that contacts the protruding piece 11 in the insertion direction P in a streak shape.

In the hole 7 of the second flat plate-shaped electrode 3, the insulating pin 6 contacts the projecting piece 11 and deforms it in the inserting direction P in response to the insertion of the insulating pin 6, and the metal powder 12 projects the projecting piece 11. Approach piece 11. However, since the positions of the respective protruding pieces 11 on the first and second sheets are displaced by 45 ° about the axis z, the protruding pieces 11 of the second flat plate-shaped electrode 3 come into contact with the metal powder 12. Can be avoided. As a result, it is possible to prevent a decrease in electrical breakdown voltage between the flat plate-shaped electrodes 3 and 3. In the present embodiment, the holes 7 of the third plate electrode 3 are
The surface of the part of the insulating pin 6 that contacts the protruding piece 11 is
When inserting the insulating pin 6, the protruding piece 11 of the first plate-shaped electrode 3 is inserted.
The tapered shape of the insulating pin 6 and the protruding amount of the protruding piece 11 are set so as to avoid contact with the.

Next, after removing the spacer 8 as shown in FIG.
Foreign substances such as dust can be removed by immersion cleaning and steam cleaning, a withstand voltage test can be performed, and a flat display device can be obtained by assembling.

The present invention can be configured in various modes other than those shown in the above embodiments.

For example, the material and shape of the insulating pin, the shape of the hole of the flat electrode, the method of holding the flat electrode, and the like are not limited to those described in the above embodiment, and can be appropriately designed.

EFFECTS OF THE INVENTION According to the invention of claim 1, the insulating pin can be brought into non-contact with the peripheral portion of the hole of the flat plate electrode, so that the peripheral portion can be prevented from being deformed. It is possible to secure the dimensional accuracy between the flat plate-shaped electrodes and avoid the situation that the landing of the electron beam is disturbed and the image quality is deteriorated.

According to the second aspect of the invention, between the adjacent flat plate electrodes, contact between the metal powder adhered to the surface of the insulating pin by one flat plate electrode protruding piece and the other flat plate electrode protruding piece is prevented. Since this can be avoided, it is possible to avoid a decrease in electrical withstand voltage between the flat plate-shaped electrodes due to the metal powder adhering to the surface of the insulating pin.

Further, according to the present invention, since the flat plate-shaped electrode can be supported and fixed without the spacer, it is possible to avoid oxidation and thermal deformation due to heating of the flat plate-shaped electrode as in the conventional example. The landing on the screen can be performed accurately, and the image quality can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a fixing structure for a flat plate-shaped electrode according to a first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing a state in which an insulating pin is inserted into a hole of each flat plate-shaped electrode. FIG. 4 is a plan view showing the shape of the holes of the flat plate electrode, FIG. 4 is an exploded perspective view of the flat panel display device in the present embodiment, and FIG. 5 is a fixing structure of the flat plate electrode in the second embodiment of the present invention. FIG. 6 is a plan view in which the respective flat plate-shaped electrodes are arranged in parallel in the insertion direction of the insulating pins, and FIG. 7 is a partial cross-sectional view showing a flat plate-shaped electrode fixing structure in a conventional example. 3 ... Flat plate electrode, 6 ... Insulating pin, 7 ... Hole, 10 ...
Peripheral part, 11 ... protruding piece, z ... axis.

Claims (2)

[Claims] 1. A plurality of projecting pieces projecting inward from a peripheral portion of each hole provided coaxially with a plurality of flat plate-shaped electrodes, and the projecting pieces are provided on tapered insulating pins inserted into these holes. A flat plate electrode fixing structure in a flat panel display device, wherein each flat plate electrode is fixed by elastically contacting a piece from the periphery. 2. A flat plate electrode in a flat panel display device according to claim 1, wherein the positions of the respective projecting pieces are shifted about the axis in the coaxially located holes of the flat plate electrodes adjacent to each other. Fixed structure.