JP3153994B2 - Electron gun assembly method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for assembling an electron gun for a cathode ray tube.

SUMMARY OF THE INVENTION According to the present invention, in a method for assembling an electron gun for a cathode ray tube, a plurality of independent first electrodes each having a projection formed with an electron beam transmission hole are inserted into the projection while being mutually inclined. Through each insulating space arranged. After joining and integrating with a common second electrode, incorporating a cathode in each first electrode, inspecting a distance between the cathode, the first electrode and the second electrode, and then beading the second electrode together with other electrodes. By fixing with glass, it is possible to inspect and sort the dimensions of the assembled state at the time of assembling, thereby improving the yield of non-defective products after the completion of the cathode ray tube.

[Conventional technology]

The electron gun used for the cathode ray tube is embedded with a support piece protruding from each electrode in a state in which the electrodes constituting the electron gun are held in a required positional relationship with each other, embedded in heat-softened beading glass, and then integrated. The cathode whose dimensions have been previously verified by the spacers is inserted into the first electrode and is assembled.

FIG. 5 shows an example of a conventional method for assembling an electron gun. This example is for a three-beam single electron gun for a high-definition color cathode ray tube, and has three first electrodes G corresponding to red, green and blue.
₁ [G _1r, G _1g, G _1b], the second electrode G ₂ common to the first electrodes G _1,
The convergence means including the third electrode G ₃ , a fourth electrode G ₄ , a fifth electrode G _5, and four electrostatic deflection plates (not shown) are arranged and held in a required positional relationship by a jig. Supporting pieces (1) formed integrally from each electrode
Is heat-softened to a pair of beading glass (2)
[(2A) and (2B)] embedded integrated each electrode G ₁ ~G ₅ and convergence means. Thereafter, the cathode K is inserted into the center hole of the insulating base (5) in which the cathode conductive pins (3) and the heater conductive pins (4) are erected, and a V-shaped space is formed between the cathode K and the cathode conductive pins (3). A cathode assembly (which is mechanically and electrically joined via a conductive piece (6), and a heater (8) connected from a cathode K to a heater connecting piece (7) integrated with the heater conductive pin (4). insert disposed in each of the first electrodes G ₁ with 9) an insulating space (10), a retainer (electron gun holding the cathode assembly (9) via a not shown) to the first electrode G ₁ is assembled Can be

[Problems to be solved by the invention]

In the electron gun assembled as described above, the cathode K and the distance between the first electrode G _1, the cathode K and the second electrode
Concentricity such distance and the first electrode G ₁ and the second three transmission holes of the electrode G ₂ between G ₂ is important to the characteristics of the electron guns, to inspect them after beading is very difficult is there. Actually, the collation value may be wrong or the assembling work of the cathode structure (9) may be insufficient. This is the first defect after the completion of the cathode ray tube. Was difficult to determine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an electron gun assembling method capable of improving the yield of non-defective products of an electron gun by permitting inspection of good and defective when assembling the electron gun.

[Means for solving the problem]

According to the electron gun assembling method of the present invention, a plurality of independent first electrodes each having a projection formed with an electron beam transmitting hole are inserted through the respective insulating spacers which are inserted into the projection in a mutually inclined state. After joining and integrating with a common second electrode, incorporating a cathode in each first electrode, inspecting a distance between the cathode, the first electrode and the second electrode, and then beading the second electrode together with other electrodes. Fix with glass.

The cathode, the first electrode, and the second electrode are integrated by first brazing the first electrode and the second electrode via an insulating spacer so as to be integrated, and then incorporating the cathode structure in the first electrode. Do.

[Action]

According to the above-described electron gun assembling method, a plurality of first electrodes and a common second electrode are joined and integrated via respective insulating spacers, and after incorporating the cathode, the cathode, the first electrode, and the like before beading. Since the distance between the second electrodes is inspected, that is, by measuring the distance between the cathode and the first electrode and the distance between the cathode and the second electrode, it is possible to determine whether the distance between the electrodes is good or not. it can. Therefore, the defect of the electron gun accompanying the incorporation of the cathode can be reduced, and as a result, the yield of non-defective cathode ray tubes can be improved. Each first electrode is formed with a protruding portion having an electron beam transmitting hole formed thereon, and each first electrode is joined to a common second electrode via each insulating spacer inserted and arranged in the protruding portion. The distance between the electrode and the second electrode can be set to a specified minute distance, and the thickness of the insulating spacer can be larger than the distance between the electrodes, so that the strength of the insulating spacer can be increased. Furthermore, after assembling the first electrode and the second electrode, the concentricity of each of the three transmission holes is measured and selected, and the yield can be improved. Also, since the leads necessary for the connection, for example, the first electrode lead, the cathode lead, the heater lead, and the like can be attached before beading, the workability of the assembly is improved.

〔Example〕

Hereinafter, an example of an electron gun assembling method according to the present invention will be described with reference to FIGS. 1 to 4.

The figure shows a case where the present invention is applied to a three-beam single electron gun for a high-definition color cathode ray tube such as a CRT for air traffic control, a CRT for CAD / CAM or a CRT for computer graphics.

First, as shown in FIGS. 1A and 1B, three first electrodes G having electron beam transmitting holes h ₁ [h _1r , h _1g , h _1b ], respectively.
₁ [G _1r , G _1g , G _1b ] and a common second electrode G ₂ having an electron beam transmitting hole h ₂ [h _2r , h _2g , h _2b ] on the central plane and the inclined surfaces on both sides thereof. With the electron beam transmission holes h _1r and h _2r , h _1g and h _2g ,
h _1b and h _2b are integrated by brazing via an insulating spacer (21) so as to correspond to each other.

At the time of this brazing, as shown in FIG. 1C, for example, a Ni plating layer (23) of about several μm is formed on both surfaces of a ceramic spacer (26) having a through hole (22) at the center, and A MoMn metallized layer (24) of about 10 μm is formed, and a brazing material of several tens of μm, for example, a silver braze (25) is further formed thereon.
An insulating spacer (21) formed by forming is prepared. This insulating spacer (21) is connected to each of the first electrodes G _1r , G _1g , G _1b and the second electrode G.
Placed between _2, 860 ° C. by a vacuum furnace or a hydrogen furnace in a fixed state by a jig, about 30 minutes heated by the respective first electrode G _1r, G
_1g, bonding the G _1b and the common second electrode G _2.

Here, the distance d between the second electrode G ₂ in common with the first electrode G ₁
Is usually about 0.1 to 0.4 mm, and the strength cannot be obtained if the insulating spacer (21) having that thickness is used. So first electrode G _1, for example, the protruding length 0.6mm approximately protrusions as shown (2
7) is provided, to form an electron beam transmitting hole h ₁ on the end face of the projecting portion (27), as the thickness of the insert disposed an insulated spacer to the protrusion (27) (21) For example 0.7~0.74mm The distance d is set to 0.1 to 0.14 mm, which is required in characteristics. Thus, in the case of providing a protruding portion on the first electrode G _1,
As compared with the case of narrow between the first electrode and the second electrode projections provided on the second electrode G _2, processing is easily, thereby improving the machining accuracy.

Next, as shown in FIG. 2, the cathode structure (9) is incorporated in each of the first electrodes G _1r , G _1g , G _1b integrated with the second electrode G ₂ . This cathode assembly (9) is provided with a cathode K [Kr, K] in the center hole of an insulating base (5) in which a cathode conductive pin (3) and a heater conductive pin (4) are planted in the same manner as in FIG.
g, Kb], and mechanically and electrically joins the cathode K and the cathode conductive pin (3) via the V-shaped conductive support piece (6), and is integrated with the heater conductive pin (4). The end of the heater (9) of the cathode K is connected to the heater connecting piece (7) (see FIG. 3).

After inserting the cathode structure (9) into each of the first electrodes G _1r , G _1g , G _1b via an insulating spacer (10), a retainer (11) on a rod is arranged, and this and the first electrode G _1r , G _1g and G _1b are welded to fix the cathode assembly (9) in the first electrodes G _1r , G _1g and G _1b .

Next, in a state where the cathode structure (9) is incorporated and the three first electrodes G _1r , G _1g , G _1b and the common second electrode G ₂ are integrated, between the cathode K and the first electrode G _1. distance, the cathode K and the distance between the second electrode G _2, etc., so-called cathode K, a first electrode G _1, second
Distance example DOF microscope mutual electrode G _2, measured by the air micro or capacitance measuring method, good, the selection of the defective performed at this stage.

After sorting, the leads required for connecting wire, as shown in FIG. 3 attach the (heater leads (12), a cathode lead (13), G ₁ lead (14), etc.).

Thereafter, the first electrode G ₁ and the second electrode G ₂ and the other electrodes are integrated together incorporate cathode structure (9) as shown in FIG. 4 that is, the electron beam transmitting hole h _3r, h _{3 g,} Convergence means including a third electrode G ₃ and a fourth electrode G ₄ having h _3b , a fifth electrode G ₅ (not shown) and four electrostatic deflection plates, and in this example, an electron beam incident on the main electron lens of disposing between the second electrode G ₂ and the third electrode G ₃ in order to adjust the divergence angle electron beam transmitting hole h _Mr, h _Mg, an auxiliary electrode G _M having h _Mb, arranged at respective predetermined positional relationship Then, a pair of heat-softened beading glasses (2) [(2A) and (2B)] are embedded in a support piece (1) protruding from each electrode and integrated to obtain a target electron gun (28). Incidentally, since the first electrode G ₁ and the second electrode G ₂ are integrated via an advance insulating spacer (21),
Support pieces only to the second electrode G ₂ of (1) is provided, which forms to support embedded in the beading glass (2).

According to the electron gun assembling method described above, since the first electrode G ₁ and the second electrode G ₂ are integrated by brazing through an advance insulating spacer (21), the first electrode G ₁ and by beading not required assembly of the second electrode G ₂ is, it is easy to incorporate cathode structure (9) to the first electrode G ₁ before beading. After incorporating the cathode structure (9), a cathode K before beading, a first electrode G ₁ and the second mutual distance of the electrodes G ₂ such checks, good, since the selection of poor electron gun It is easy to determine good or bad during assembly.
A highly reliable electron gun, that is, a three-beam single electron gun (2
8) Can be assembled. In addition, the workability can be improved because the leads can be attached before the beading at the time of connection. Therefore, the defect of the electron gun associated with the incorporation of the cathode can be reduced, and the yield of non-defective finished high definition color cathode ray tubes can be improved.

On the other hand, high-definition color cathode ray tubes such as the above-mentioned air traffic control CRT, CAD / CAM CRT or computer graphic CRT scan at a high frequency. Must be smaller than color cathode ray tubes. Therefore, a method of absorbing on the circuit variation of cut-off characteristic by the electrically independent separates the first electrode G ₁ in three is used in the three-beam single electron gun.

In the above-described three-beam single electron gun, the three transmission holes h _2r , h _2g , and h _{2b of} the second electrode G ₂ are provided on mutually inclined surfaces, respectively. Well three first electrodes
G _1r , G _1g and G _1b must be arranged. In an assembling method in which the three first electrodes G _1r , G _1g , G _1b and the second electrode G ₂ are individually embedded in the beading glass (2), there are many places where assembly errors occur, and the first electrode G ₁ and the second electrode G 2 focusing characteristics due to positional shift of the electron beam transmitting hole h ₁ and h ₂ of the electrode G _2, deterioration of the convergence characteristic is likely to occur.

However, in the above-described example, three first
The electrodes G _1r , G _1g , and G _1b and the common second electrode G ₂ are connected to an insulating spacer (2
The first electrode G ₁ is integrated by brazing through 1).
If it is possible to improve the electron beam transmission hole h ₁ and h ₂ concentricity accuracy between the respective corresponding second electrode G _2, it is possible to prevent focusing characteristics, the deterioration of the convergence characteristic.
Further, it is easy to measure and select the concentricity of h ₁ and h ₂ . The distance between the first electrode G ₁ and the second electrode G ₂ is obtained with high accuracy.

Since the first electrode G ₁ and the second electrode G ₂ are bonded strongly via an insulating spacer (21), each corresponding to the first electrode G ₁ in the heat process in the manufacturing of the cathode ray tube second electrode G ₂ problem accuracy mad distance between concentricity and the first electrode G ₁ and the second electrode G ₂ of the electron beam transmitting hole is also improved.

Since the first electrode G ₁ and the second bonding electrode G ₂ is strong, even if an impact from the outside of the cathode ray tube, or the first electrode G ₁ and also the temperature rise in the tubes during operation of the cathode ray tube without the distance between the second electrode G ₂ is changed, thus the cut-off characteristic by the or the temperature rise impact also improves problem give aberrant host wide balance changes.

〔The invention's effect〕

According to the above-described method for assembling the electron gun of the present invention, the distance between the cathode, the first electrode, and the second electrode is inspected before the beading after the cathode, the first electrode, and the second electrode are integrated. It is possible to discriminate between good and bad distances from each other, and to assemble a highly reliable electron gun. Therefore, it is possible to reduce the failure of the cathode ray tube due to the failure of the electron gun accompanying the incorporation of the cathode. Furthermore, it is possible to concentricity of the first electrode G ₁ and the three transmission holes of the second electrode G ₂ measured and sorted. Further, since the leads can be attached before the beading at the time of the connection, the workability of assembling the electron gun can be improved.

Since each of the first electrodes has a protruding portion in which an electron beam transmitting hole is formed, the first electrode can be coupled with a thick insulating spacer having a large strength, and the distance between the first electrode and the second electrode is defined. It can be set to a very small distance.

Since the plurality of independent first electrodes are not fixed to the beading glass but are joined to the common second electrode via individually separated insulating spacers, particularly, each of the first electrodes in a state of being inclined with respect to each other. It is possible to improve the accuracy of the concentricity between the corresponding electron beam transmitting holes of one electrode and the common second electrode, and to obtain the distance between the first electrode and the second electrode with high accuracy.

In addition, since each of the first electrodes and the common second electrode are strongly bonded via an insulating spacer, and the second electrode is fixed together with other electrodes by beading glass, the heat process in the manufacture of a cathode ray tube also The distance and concentricity between the two electrodes do not change.

In addition, since the bonding between the electrodes is strong, the distance and the like do not change even if a shock is applied from the outside of the cathode ray tube or even if the temperature inside the tube increases during operation of the cathode ray tube, and the white balance is disturbed. Not even.

Furthermore, since the projection having the electron beam transmission hole is formed on each first electrode, the shape of the second electrode can be simplified, and the processing of the second electrode is facilitated.

Since the second electrode integrated with the plurality of first electrodes is fixed to the beading glass, the electrode is easily fixed to the beading glass, and the electrode is firmly supported by the beading glass.

[Brief description of the drawings]

FIGS. 1 to 4 are assembly process diagrams showing an embodiment of an electron gun assembling method according to the present invention. FIGS. 1A, 1B and 1C are sectional views, plan views and insulating spacers of an assembly process (1). FIG. 5 is a perspective view showing an example of a conventional electron gun assembling method. Kr, Kg, Kb is the _{cathode, G 1r, G 1g, G} 1b first electrode, G ₂ is a second electrode, G _M is the auxiliary electrode, G ₃ and the third electrode, G ₄ and the fourth electrode,
(2A) and (2B) are beading glass, (9) is a cathode structure, and (4) is an insulating spacer.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-139745 (JP, A) JP-A-62-145624 (JP, A) JP-A-58-55354 (JP, U) 38580 (JP, B1)

Claims (1)

(57) [Claims] 1. A plurality of independent first electrodes each having a projecting portion having an electron beam transmitting hole formed therein, and each of the first electrodes is inserted into the projecting portion in a state of being inclined with respect to each other, through a common insulating spacer. After joining the two electrodes and integrating them, incorporating a cathode in each of the first electrodes, inspecting the mutual distance between the cathode, the first electrode, and the second electrode, and then connecting the second electrode together with other electrodes An electron gun assembling method, wherein the electron gun is fixed with beading glass.