JPH03159023A - Assembly of color cathode ray tube electron gun - Google Patents

Abstract

PURPOSE:To make an electron gun durable to repeatedly use for a long time by supporting a plurality of cores at a plurality of points to relatively position the cores referring to the substrate so that the electrodes of an electron gun can be assembled. CONSTITUTION:Columns 111 are integrally installed on both sides of a substrate 110 where a core 12 is plantedly installed, and a supporting pin 112 is installed on the top of each column 111. The supporting gun 112 is accurately fitted in the holes at both sides 140b of a plate-like spacer 140, and the middle diameter portion 12b of the core 12 is accurately fitted in the respective 3 holes 140a so that the core 12 can be supported at its lower part by the substrate 110 and at its upper part by the plate-like spacer 140, respectively. The length of the supporting pin 112 is determined such that errors in the lengths of electrode parts can be sufficiently compensated, each electrode and the plate-like spacer 140 are piled up alternately referring to the core as a guide basis to press a first grid 1 from the upper part by a push rod so that each electrode is fixed to a jig and concurrently to firmly hold the core 12 at its upper part. It is thereby possible for an assembly jig to be repeatedly used in a large number of times.

Description

[Detailed description of the invention] [Industrial application field] The present invention uses an improved beading jig.

The present invention relates to a method for assembling a color cathode ray tube electron gun, which prevents deformation of holes in electrode parts constituting the electron gun and provides a product with uniform focus characteristics.

C. Prior Art] In a color cathode ray tube electron gun, the assembly precision, such as the parallelism between the electrodes that make up the electron gun and the coaxiality of the opposing apertures, greatly affects the focusing characteristics. If the openings formed in the electrodes that make up the lens are deformed, the characteristics will be severely degraded.

Therefore, a jig is naturally used to assemble the electrodes that make up the electron gun while accurately positioning them relative to each other. Figures 2 (A) and (B) show an example of how to assemble a pi-potential focusing type in-line color cathode ray tube electron gun, and Figure (A) shows each electrode of the electron gun attached to a conventional beading jig. Figure 1 is a front sectional view showing the state in which
B) is a side sectional view (Japanese Unexamined Patent Publication No. 168932/1983).

In these figures, the lower third grid 4 and the upper third grid 5 are assembled into the third grid 3 by welding their respective flanges 4b and 5b in advance. A fourth grid 6, a third grid 3 (lower third grid 4, upper third grid 5), and a second Grid 2. The three openings Ga, 5a, 4a, 2a, and la of the first grid l to which the support body 1b is attached in advance are fitted, and plate spacers 13 of a predetermined thickness are provided between each electrode. .14 and 15 are held in between, and the first grid 1 is pressurized from above with a pushbutton 16 to fix each electrode to the jig. The beading jig holding each electrode in this way was attached to a beading machine, and each electrode part was placed on the multiform glass 7 which had been heated and softened at 1000 to 1200°C, as shown in FIG. 2(B). The end of the support is press-fitted for insulating support.

[Problems to be Solved by the Invention] However, in the above assembly method, only one end of the core metal of the beading jig is fitted and held on the substrate.
Due to the repeated effects of unbalanced stress from the multiform glasses pressed from opposite directions, thermal stress due to temperature rise, etc., minute bends occur. In order to maintain coaxial precision between the fc pole openings, the tolerance between the diameter of each part of the core bar and the opening diameter of the electrode component is as small as about 0.03-, so deformation exceeding this range poses a problem.

The bending of the core metal is greatest at the small diameter tip where an electrode with a weak opening is attached, with an opening in a thin plate.
There was a problem in that the aperture was deformed when attaching electrode parts or removing the electron gun from the jig after beading.

In recent years, there has been a trend to lengthen the third grid of an electron gun in order to improve focus characteristics, and in this case, the core metal becomes even longer, which increases the problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for assembling an electron gun for a color cathode ray tube, which prevents deformation of the electrode aperture due to bending of the core metal without increasing the frequency of replacing the core metal, and prevents fluctuations in focus characteristics. do.

[Means to solve the problem] In order to achieve the above object, the present invention.

At least one of the plate-shaped spacers of the beading jig is fitted with a plurality of core metals into the plurality of spacers provided on the spacer, and the jig is placed outside the part that contacts the electrode when the jig is installed. By engaging with a solid support member installed separately from the core bar on the substrate and fixing the plate spacer so as to prevent it from moving in the plane direction, each of the 1Ml several-core core bars can be supported at multiple points. Thus, the electrodes of the electron gun are assembled while accurately positioning the core metal relative to the substrate.

[Function] If the above measures are taken, the holding strength of the core bar will be significantly improved, so even if there is an imbalance in the multiform glass pressing force or an increase in the core bar temperature during beading, the core bar will not bend. It is significantly reduced and can withstand repeated use over a long period of time.

[Example] Figures 1 (A) and 1 (B) show a state in which electron gun electrodes are attached to a beading jig according to an example of the present invention, and Figure 1 (A)
) is a front sectional view thereof, and figure (B) is a side sectional view. Second
The same parts as in the figure are given the same reference numerals.

In these figures, pillars 111 are integrally provided on both sides of a substrate 110 on which a cored metal 12 is implanted, and support pins 112 are provided on the upper portions of the pillars 111, respectively.

The support pin 112 is inserted into both side holes 140b of the plate spacer 140.
By fitting the three holes 140a with the medium diameter portion 12b of the core metal 12 with high precision, the core metal 12 has its lower part attached to the substrate 1.
10, the upper portions are supported by plate-shaped spacers 140, respectively.

By setting the length of the support pin 112 to a length that can sufficiently absorb errors in the length of the electrode components, each electrode and the plate-shaped spacer can be guided using the core bar as the guide reference, as in the case shown in FIG. By stacking the first grids 1 alternately and pressing the first grids 1 from above with the pushers 16, each electrode is fixed to the jig, and the core metal 12 is also firmly held at the top.

In this way, the core metal 12 is held in two places, upper and lower, so
Even if there is a slight stress imbalance when multiform glass is crimped, the bending of the core metal 12 can be reduced to a level that does not pose a practical problem, and the jig can withstand repeated use for many years. It will be done.

[Effects of the Invention] As explained above, according to the present invention, one assembly jig can withstand repeated use many times, the core metal of the jig used as a reference for electrode assembly is prevented from bending, and the jig The core bar is now held at a precise relative position anywhere with respect to the substrate, eliminating the possibility of deformation of the aperture of the electrode component during assembly, and preventing fluctuations in the focus characteristics of the assembled electrode. You can get the effect that you can.

[Brief explanation of the drawing]

FIG. 1(A) is a front sectional view showing a state in which electrodes of a pi-potential focusing type in-line color cathode ray tube electron gun are attached to a beading jig according to an embodiment of the present invention;
Figure 1 (B) is a side sectional view of the same state, Figure 2 (A) is a front sectional view showing the same electron gun electrodes attached to a conventional beading jig, and Figure 2 (B). is a side sectional view of the same state. 1...First grid, 2...Second grid, 3
...3rd grid, 6...4th grid, 7.
...Multiform glass, 11,110...Jig substrate. 12... Core metal, 13, 14, 15, 140-...
Plate spacer, 111... Support column, 112... Support pin. (A) Section (B)

Claims (1)

[Claims] 1. The plurality of electrodes that make up the electron gun and the plate-shaped spacers that are interposed alternately between the electrodes to ensure the distance between the electrodes, and the plurality of holes drilled in each of these parts are attached to the substrate of the jig. Electrode insulation support rods made of heated and softened multi-foam glass protrude laterally from each electrode, stacked on the substrate while being engaged with multiple core metals implanted in the substrate and pressed from above. In a beading jig for assembling an electron gun by press-fitting and fixing an electrode support into glass by pressing it against a support, at least one of the plate-shaped spacers is inserted into each of the plurality of holes provided in the spacer. In addition to fitting the cored metals, the plurality of cored metals are positioned relative to the board by engaging with a solid support member installed separately from the cored metals on the board outside of the part that contacts the electrode when the jig is attached. A method for assembling a color cathode ray tube electron gun, characterized in that the electrodes of the electron gun are assembled while reliably and accurately performing the steps.