JPS62145624A - Manufacture of electronic gun - Google Patents

Abstract

PURPOSE:To improve assembling precision in three parts of electrodes, that is, a control electrode, an acceleration electrode, and a limiting aperture, by aligning respective beam-transmitting holes of the acceleration electrode and the limiting aperture by optical means on the basis of the beam-transmitting hole of the control electrode. CONSTITUTION:Because a beam-transmitting hole 4 of an acceleration electrode G2 and that 5 of a limiting aperture LA are aligned by optical means on the basis of the beam-transmitting hole 3 of a control electrode G1, axial property among respective beam transmitting holes 3-5 of these three electrodes G1, G2 and LA can be obtained with high precision. Since the control electrode G1, the acceleration electrode G2 and the limiting aperture LA are unified, with an insulating substrate 12 put among them, strength of supporting the acceleration electrode G2 and the limiting aperture LA becomes large.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing an electron gun for a cathode ray tube.

[Summary of the invention]

The present invention is a method for manufacturing an electron gun with a limiting aperture, in which a control electrode and an accelerating electrode holder are brazed to both metal-coated surfaces of an insulating substrate, respectively, and the beam of the accelerating electrode is aligned with the beam transmission hole of the control electrode as a reference. By positioning the transmission hole and the beam transmission hole of the limiting aperture respectively by optical means and fixing and supporting the acceleration electrode and the limiting aperture on the acceleration electrode holder, three of the control electrode, acceleration electrode and limiting aperture are fixedly supported. The assembly density of the electrode section is improved.

[Conventional technology]

For example, in high-definition color cathode ray tubes and beam index type color cathode ray tubes, the diameter of the beam spot on the fluorescent surface must be minute in order to obtain good images. Generally, in order to obtain a fine beam spot diameter with a cathode ray tube, the main focus is on reducing the diameter of the crossover point itself, which is the object point to be projected, or on reducing the aberration of the projection lens itself. .

In response to this, the present applicant first considered providing a limiting aperture in the electron gun. Figure 3 shows an example of its configuration, in which a cathode K, a control pole G1, an acceleration electrode G2, a first anode G1, and a second anode G4 (not shown) are arranged in order, and an acceleration electrode A limiting aperture LA and a secondary electronic control electrode SG are arranged after G2, and each of these electrodes is fixedly supported by a pair of insulating support members (so-called bead glasses) (1) via a support bottle (2). C
Become. The first anode G3 and the second anode G4 constitute the Morenz for the eastern part of the prefecture. Then, the apparent diameter of the crossover point is reduced by the limiting aberna or LA, the electron beam divergence angle is reduced, and the beam spot diameter is made finer. Furthermore, due to the secondary electronic control electrode SG which is given a lower m1h than the limiting aperture LA,
- is prevented from reaching the fluorescent surface -1.

[Problem that the invention seeks to solve]

In the above-mentioned electron gun, especially the control electrode G1 and the acceleration electrode 6
When assembling the three electrodes of electrodes Gt, G2 and limiting aperture L A, ζ is smaller than each beam transmitting hole (31, a) Guide holes (3a), (4a), and (5a) for gamma evaluation are provided on both sides of the people in (3a) and (5), and these guide holes (3a), (4;
1) and (5a) through the common guide bin on the jig side.
71 The beam 6 holes (31, f4+ and (5) of each electric wire (Gl, G2 and LA) were aligned so that they were supported by the insulating support F, ? member (1). .

However, in such a set 1'f, each electrode G1
．． The alignment of the beam transmission holes (3), (4), and (5) between the 3' poles is determined by the positional accuracy between the beam transmission hole and the guide hole in G2 and LA and the accuracy of the jig. Because of this, it was difficult to obtain a 21 degree alignment. or,
Since the accelerating electrode G2 and the limiting apertures I and A are close to plate-shaped electrodes, their support strength is weak, and the manufacturing cost of each electrode is high due to the provision of guide holes.
There were problems such as the jigs and tools being complicated and the hexavalent.

The present invention provides a method for manufacturing an electron gun that improves the above-mentioned problems.

[Means for solving problems]

In the present invention, an insulating substrate (12) whose both sides are coated with metal (so-called metallization) is provided, a control electrode G1 and an accelerating electrode holder (15) are brazed to both sides of this insulating substrate (12), and then the control electrode With reference to the beam transmission hole (3) of G1, the beam transmission hole (4) of the accelerating electrode G2 and the beam transmission hole (5) of the limiting aperture LA are transmitted with light'? The accelerating electrode 62 and the limiting aperture LA are aligned by physical means and placed on the accelerating electrode holder (1).
5) Make sure that it is fixedly supported above.

[Effect]

Accelerating electrode G based on the beam transmission hole (3) of control electrode G1
Since the beam transmission hole (4) of No. 2 and the beam transmission hole (5) of limiting aperture L and A are aligned by optical means, these three electrodes G1゜62 and L
The coaxiality of each beam transmission hole (31 (41 and (5)) of A can be obtained with surface precision.Also, the control electrode G1, the acceleration electrode G2 and the IJ misoting aperture LA are sandwiched between the insulating substrate (12). Since they are integrated, the supporting strength of the accelerating electrode 62 and the limiting aperture LA is increased.

〔Example〕

Hereinafter, an example of a method for manufacturing an electron gun according to the present invention will be explained with reference to FIGS. 1 and 2.

First, as shown in FIG. 1B, an insulating substrate, such as a ceramic substrate 1 (12
) and coated with, for example, Mo on both sides of the substrate (12).
Gold 1 made by depositing Mn and plating Ni on it
A frit layer (so-called metal rice In) (13) is formed on the metal coating layer (13), and a brazing material (I4) such as 8g wax or sieve wax is coated on each of the metal coating layers (13).This ceramic substrate A control electrode G1 shown in FIG. 1C and an acceleration electrode holder (15) made of the same material as the bozz electrode material shown in FIG. , integrate (see first diagram), control electrode G
1 is formed into a cup shape with a beam transmission hole (3) in the center.

Accelerated electricity - holder (15) is treated as a heramic base (1
It is formed into a shape with a cylindrical part (15a) fitted into the opening (11) of 2) and a flange part (15b) which is brazed to the surface of the base 1.

Next, place the Bozu acceleration electrode G2 in the holder (15) in Fig. 1F.
The beam transmission hole (4) of the acceleration electrode G2 is passed through the beam transmission hole (4) of the acceleration electrode G2 with the beam transmission hole (3) of the control electrode G1 as a reference.
``1'' Align the position while looking at the microscopic mirror, and electrically weld the accelerating electrode G2 to the holder (15).Next, in the same way, attach the accelerating electrode 02-1 to the position shown in Fig. 1E. and the beam transmission hole (3) of the control electrode G1.
) based on t1-, align the beam transmission hole (5) of the limiting aperture LA while looking at the passing microscope S, and align the limiting aperture LA with the accelerating electrode G2.
Electrically weld to. Due to the dust, the C1 control electrode Gl, the accelerating electrode 62, and the limiting 7 perch LA are integrated with coaxial surface accuracy (see FIG. 1G).

After that, as shown in FIG. 2, the control electrode G1, the acceleration electrode 62, and the limiting aperture LA are integrated, the secondary control electrode ζSG, the first anode G3, and the limiting aperture LA are integrated. Two anodes G→ are sequentially arranged on the same axis. In this case, the second anode G4 integrally includes a small-diameter support end (21) and a large-diameter cylindrical portion (22) connected thereto, and the large-diameter cylindrical portion (
22) is provided with a window (23). A pair of window portions (23) are provided at the back of the large-diameter cylindrical portion (22) at a location extending from the main lens-shaped portion (h) with the axis thereof in between.
A small-diameter portion (24) that passes through the small-diameter support end (21) of the anode G4 in a non-contact manner, and a large-diameter end portion ( 25). Each of the 'di poles C+, SG, 03 and G4 is fixedly supported by a common insulating support member (so-called bead glass) (1) of the 'ζ-1 through a support bottle (2).

The second anode G→ is insulated and supported by its small diameter support end (21), and the first anode G) is supported by its large diameter end (25) or small diameter part (25) facing the window (23). 24), in this example, the large diameter end (25) is supported by an insulating support member +11 extending to the window (23).

According to the above manufacturing method, the beam transmission hole (3) of the control electrode G1 is
By aligning the beam transmission hole (4) of the pole G2 and the beam transmission hole (5) of the limiting aperture LA, and fixedly supporting the accelerating electrode 44G2 and the limiting aperture LA, each 'rki pole Beam transmission hole between L, N2 and LA +31. A coaxiality of +41 and (5) is obtained with IO+ accuracy. At the same time, the acceleration electrode G2 and the ramie/ting aperture LA, which are close to the plate electrode, are welded to a holder (15) that is brazed to an insulating substrate (12), and integrated into the control electrode G1 via this insulating substrate (12). Therefore, it has a large supporting strength that can sufficiently withstand heat and external forces. In addition, the control electrode G
1, accelerating electrode G2 and limiting apertures (2) and (8), there is no need to provide a hole in the guide, so the manufacturing cost is reduced. Also, assemble the electron gun l'7. There is an advantage that the tools used for exiting are not complicated.

(Effect of the invention) According to the manufacturing method of the present invention, in particular, the control electrode G1, the acceleration electrode G
2 and the limiting aperture LA, the precision, that is, the coaxiality of the beam transmission hole of each electrode becomes good, and the supporting strength of the nearly root-shaped accelerating electrode 62 and the limiting aperture LA becomes large. be. Therefore, it is suitable for application to the manufacture of, for example, +G+ definition color cathode ray tubes, electron guns equipped with beam transmission holes and limiting apertures for Knox type color cathode ray tubes.

[Brief explanation of drawings]

Fig. 1 shows a small O-L diagram of an example of the manufacturing method of an electron gun according to the present invention, and Fig. 2 shows a 1tr diagram of the electron gun finally obtained.
FIG. 3 is a sectional view of the space between the electron guns for comparison. G1 is a control electrode, G2 is an acceleration electrode, G3 is a first anode, G
4 is the second anode, LA beam misting aperture, S
Is G secondary muntin control? 1! Pole, f3) (41 (5) is the beam transmission hole, (12) is the insulation 2! slope, (13) is the metal waveta layer, (14) is the brazing material, (15) is the acceleration m finger holder.

Claims (1)

[Claims] A control electrode and an accelerating electrode holder are brazed to both metal-coated surfaces of an insulating substrate, respectively, and the beam transmitting hole of the accelerating electrode and the limiting aperture are adjusted based on the beam transmitting hole of the control electrode. A method for manufacturing an electron gun, characterized in that the accelerating electrode and the limiting aperture are fixedly supported on the accelerating electrode holder by positioning the respective holes by optical means.