JPH0589802A - Thin image display tube wire cathode fixed seat mounting device - Google Patents

Abstract

(57) [Abstract] [Purpose] The fixed seat 1 is caulked to the normal position on the cathode plate 2. [Structure] After temporarily fixing a pair of fixed legs 1a provided on a fixed seat 1 to which a wire cathode for electron beam output of a thin image display tube is attached at a substantially predetermined position of a cathode plate 2, a pair of fixed legs 1a of the fixed seat 1 The fixed leg positioning pin 3 having a trapezoidal cross section is inserted between the fixed legs 1a so that the fixed leg 1a is positioned at a normal mounting position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line cathode fixing seat attachment device for attaching a line cathode fixing seat for attaching a line cathode of a thin image display tube to a cathode plate.

[0002]

2. Description of the Related Art In recent years, for the purpose of improving portability of computer equipment and the like, the thickness of video display devices mounted on these equipment has been rapidly reduced. Various methods have been proposed and some of them have been put to practical use in a device using a cathode structure for thinning such an image display device. One example is disclosed in JP-A-57-135590. There is a thin display tube using a wire cathode.

Conventionally, this type of thin display tube has a line cathode for generating an electron beam, and a back electrode and an extraction electrode are provided in front of and behind the line cathode. The back electrode is a plate-shaped electrode fixed by a fixing table provided on the inner surface of the back container of the thin display tube, and has a potential lower than the potential of the line cathode so that the electron beam generated by the line cathode is directed toward the extraction electrode. Is set to. On the other hand, the extraction electrode is set higher than the potential of the line cathode in order to extract the electron beam from the line cathode. The extracted electron beam has a signal electrode, a focusing electrode,
The light is made incident on the screen coated with the phosphor provided on the inner surface of the front glass container through the horizontal and vertical deflection electrodes to emit light.

By the way, the fixing seat for fixing the wire cathode is attached to the cathode plate in advance. However, since the positional relationship between the wire cathode and each of the other electrodes requires a high degree of accuracy, the fixing seat is the cathode plate. Must be installed accurately.

A conventional wire cathode fixing seat mounting device will be described below with reference to FIG. In the case of the conventional device shown in FIG. 4, the wire cathode fixing seat 11 is positioned so as to coincide with the center of the cathode plate 12 with reference to one end surface of the cathode plate 12, and the cathode plate 12 is provided with a caulking punch jig. It was attached using. That is, the fixed seat 11 has a pair of fixed legs 11a provided on both sides inserted into the insertion holes provided in the center of the cathode plate 12 in a loosely fitted state, and then the central position of the fixed seat 11 with respect to the cathode plate 12. By aligning one end face of the cathode plate 12 as a reference, and by crimping both fixing legs 11a of the fixing seat 11 with a punching jig for crimping, which is also positioned with one end face of the cathode plate 12 as a reference, The fixed seat 11 was attached to the cathode plate 12.

In the prior art example shown in FIG. 4, a pair of fixed seats are attached to the cathode plate 12 side by side. In the figure, a and b are from the center of each fixed seat 11 to the cathode plate 12. The distance to one of the end faces is shown.

[0007]

However, in the above-mentioned conventional structure, the caulking punch jig is used as the cathode plate 12.
Since one end surface of the cathode plate 12 was aligned, the fixed seat 11
However, there are problems that the cathode plate 12 cannot be accurately attached to the center of the cathode plate 12 or that it cannot protrude from the diameter of the punch jig and cannot be caulked normally.

In view of the above-mentioned conventional problems, the present invention allows the wire cathode fixing seat to be normally and easily attached to the cathode plate, and further, the fixing seat can be attached to the cathode plate with high accuracy. Another object of the present invention is to provide a thin flat-screen image display tube cathode fixed seat attachment device.

[0009]

The thin image display tube wire cathode fixing seat attachment device of the present invention has been made to solve the above-mentioned problems, and is for fixing the electron beam output line cathode of the thin image display tube. A pair of fixed legs provided on the seat are temporarily fixed to a predetermined position of the cathode plate and then caulked, and are arranged so as to face the predetermined position of the cathode plate and are generally temporarily fixed to the predetermined position of the cathode plate. The present invention is characterized by having a fixed seat positioning pin having a trapezoidal cross section that can be inserted and removed between a pair of fixed legs of the fixed seat.

[0010]

With the device having the above structure, the fixed leg of the fixed seat is temporarily fixed at a predetermined position of the cathode plate, but the fixed seat positioning pin has a trapezoidal cross section for determining the center position of the fixed seat with respect to the cathode plate. By inserting between the fixed legs of the fixed seat, the fixed seat can be normally and easily attached to the center of the cathode plate, whereby the fixed seat can be attached to the cathode plate with high accuracy. ..

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a thin image display tube wire cathode fixed seat mounting device of the present invention will be described below with reference to the drawings. 1 to 3 are schematic views for explaining a thin image display tube wire cathode fixed seat mounting device according to an embodiment of the present invention. In these figures, 1 is a fixed seat for attaching a wire cathode for electron beam output of a thin image display tube,
A pair of fixed legs 1a is provided from both sides toward the back side. Reference numeral 2 denotes a cathode plate, and a pair of insertion holes 2a for inserting the fixing legs 1a of the fixing seat 1 are formed in the thickness direction at predetermined two positions arranged in the length direction.

The fixed leg 1a of each fixed seat 1 is temporarily inserted into the corresponding insertion hole 2a of the cathode plate 2 and then, as shown in FIG.
As shown in FIG. 5, the fixed seat positioning pin 3 is inserted between the front end portions of the cathode plate 2 that project toward the back side, whereby the cathode plate 2 is fixed in the normal position. Fixed seat positioning pin 3
Is formed into a trapezoidal cross section, and the cathode plate 2
It is arranged so as to face a predetermined position of and can be inserted and removed between the pair of fixed legs 1a.

Next, with the fixed leg 1a fixed in this normal position, the fixing pin provided on the main body of the fixing seat 1 (not shown) is temporarily fixed, and then the fixing seat positioning pin 3 is removed. , Lower the crimping punch jig and fix it
1a is fixed to the cathode plate 2 by caulking.

[0014]

As described above, according to the thin-type image display tube wire cathode fixed seat attachment device of the present invention, a pair of fixed legs provided on the fixed seat to which the electron beam output line cathode of the thin image display tube is attached is fixed to the cathode plate. It is temporarily fixed in position and then caulked, and is inserted and removed between a pair of fixing legs of a fixing seat which is arranged so as to face a predetermined position of the cathode plate and is roughly fixed at a predetermined position of the cathode plate. With a fixed seat positioning pin that has a detachable trapezoidal cross section, the wire cathode fixed seat can be normally and easily attached to the center of the cathode plate without being affected by variations and tolerances in manufacturing the cathode plate body. Therefore, the fixed seat can be accurately attached to the cathode plate.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a mounting state of a fixed seat on a cathode plate according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which a fixed seat is temporarily fixed to a cathode plate.

FIG. 3 is a front view showing a state in which a fixed seat positioning pin is about to be inserted between fixed legs.

FIG. 4 is a front view showing how a fixed seat is attached to a cathode plate in a conventional example.

[Explanation of symbols]

 1 fixed seat 1a fixed leg 2 cathode plate 3 fixed seat positioning pin

Claims (1)

[Claims] 1. A device for temporarily caulking a pair of fixed legs, which are provided on a fixed seat to which an electron beam output line cathode of a thin image display tube is attached, at a predetermined position of a cathode plate, and then caulking it. A fixed seat positioning pin having a trapezoidal cross-section that can be inserted and removed between a pair of fixed legs of the fixed seat that is disposed so as to face the predetermined position and that is temporarily fixed to the predetermined position of the cathode plate. A device for attaching a fixed cathode of a flat-screen image display tube cathode.