JPS5836806B2 - Color picture tube bulb and its manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bulb for a color picture tube.

In recent years, with the introduction of in-line color picture tubes, dynamic convergence can be adjusted by swinging the deflection yoke on the neck or by driving it in X-Y.
Devices that do not require a special convergence circuit are becoming common.

However, if a device that does not require such adjustment can be created, the adjustment work for the color picture tube can be further simplified, and the number of man-hours required for assembling the picture receiver can be greatly reduced.

The present invention is aimed at such a purpose.

Originally, the above-mentioned oscillation or X-Y adjustment is performed to align the beam orbit axis with the center of the deflection yoke.

During purity adjustment, the beam trajectory is slightly deflected by a purity magnet and adjusted so that it passes through the exposure center.

Therefore, it is sufficient to center the deflection yoke with respect to this exposure center.

The exposure center is positioned based on the pad of the panel when forming the fluorescent surface of the panel by exposure, and the pad of the panel and the pad of the funnel are aligned with each other when joining the panel and funnel with a frit. The relative position is regulated by the tool.

Therefore, by regulating the shape of the bulb near the deflection yoke attachment part, that is, the reference line part, with respect to the pad of the funnel, the beam and the deflection yoke can be made concentric.

Even in conventional glass bulbs, neck run out or neck tilt was defined to define the relative position of the pad and neck, but both of these were to define the eccentricity or inclination of the neck, and also the purpose. However, it was intended to regulate the purity adjustment amount rather than convergence, and when the purpose is convergence as in the present invention, the eccentricity of the reference line section that directly holds the deflection yoke is specified rather than the neck section. is more direct and suitable for the purpose.

FIG. 1 is a front view showing an example of a conventional color picture tube bulb. In the figure, 1 is a panel, 2 is a funnel, and 3 is a neck.
It is joined with.

4 is a reference line, which indicates a virtual plane defined at a position a predetermined distance L from the open end of the funnel 2.

Reference numeral 5 denotes pads, and there are three pads in total, two on one long side of the funnel 2 and one on the adjacent short side, and usually have a shape that projects outward.

6 is a reference line (pad), which is provided on the panel 1 in correspondence with each of the pads 5, and 2 for each pad 5.
Books provided.

The panel 1 is provided with a predetermined fluorescent surface (not shown) on the inner surface of the panel using the reference line 6 as a reference, and this panel and a funnel (not shown) which is also covered with a graphite film or the like are attached to the reference line 6. The bulb 8 is constructed by aligning the and pad 5 and joining them together via a sealing material 7 such as frit glass.

On the other hand, a deflection yoke 9 indicated by a dotted line is mounted at a position shown in the figure so that a portion of the deflection yoke 9 overlaps the reference line 4 after completion of the color picture tube.

In the bulb 8 having such a configuration, as described above, in order to form a predetermined fluorescent surface on the inner surface of the panel 1, the panel 1 is placed on an exposure table called a light house with respect to the reference line 6. The process includes the steps of positioning the image and exposing it to light from a light source provided within the exposure table.

On the other hand, the funnel 2 and the panel 1 are sealed together by using the pad 5 of the funnel 2 as a reference and aligning the reference line 6 of the panel 1 with the pad 5 of the funnel 2.

Therefore, the shape of the vicinity of the reference line portion to which the deflection yoke is attached is not taken into account at all in the sealing process or even in the exposure process.

This also applies to the △-type electron gun. For these reasons, the alignment between the most important center of the deflection yoke and the exposure center during exposure is not in a practically satisfactory condition, and as a result, when the deflection yoke is attached, the deflection yoke oscillates, X-Y
Adjustments to the drive, etc., were unavoidable.

This adjustment required a skilled engineer and required a large amount of man-hours.

Furthermore, if the adjustment was made and then removed for some reason, it would require more man-hours to put it back on.

The present invention provides an excellent bulb for color picture tubes that solves these drawbacks, and a method for manufacturing the same.

In the present invention, the pad of the funnel is positioned based on the shape of the portion of the funnel where the eccentric yoke is attached, in other words, the shape of the funnel near the reference line.

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings.

First, FIG. 2 is a front view showing an embodiment of the color picture tube bulb of the present invention, and the same parts as in FIG.

In FIG. 2, 15 is a pad, and as shown in the enlarged view in FIG. Using a jig 19 whose outline is shown by a dashed line and which has substantially the same shape and dimensions as the side to be
The base pad 25 is cut and formed using this jig as a reference.

FIG. 4 is a diagram of a portion corresponding to FIG. 3 showing another embodiment of the present invention, and in this example, a jig is used similar to the jig 19 in FIG. 2, and the vicinity of the reference line 4 is used as a reference. A pad 35 is fixedly formed at a predetermined position of the funnel 2 via an adhesive 10.

Eccentricity of the neck with respect to the funnel pad (Neck run out) and inclination angle of the neck with respect to the funnel pad (Neck tilt)
In the case of the conventional color picture tube bulb shown in Fig. 1, which is manufactured by regulating only the k tilt), as shown in Fig. 5, the center of the funnel (marked with ) and the exposure center position determined by the position of the three pads 5 (marked with ○ in the figure) is the dimension D.
eccentricity has occurred.

In other words, if the deflection yoke 9 is positioned as it is by this reference line 4 section, the center of the deflection yoke 9 and the exposure center will be eccentric by the dimension D, so adjustment work such as swinging of the deflection yoke 9 or X-Y drive is required. .

Next, in the case of the color picture tube bulb of the present invention shown in FIG. 2, the neck runout (Neck
run out) and neck tilt (Nec
Even if there is a The base pad 25 is cut to form a pad 15.
form.

Therefore, since the center of the deflection yoke 9, which is positioned by the reference line 4, and the exposure center determined by the three pads 15 necessarily coincide with each other, the deflection yoke 9 only needs to be attached to the reference line 4, and the deflection There is no need for adjustment work such as swinging the yoke 9 or X-Y driving.

Since no adjustment work is required, the influence of individual differences among the adjustment workers is eliminated, improving positional accuracy, and since the adjustment mechanism is no longer required and the system is a fixed mechanism, impact resistance is also greatly improved.

In such a configuration, the pads 15, 35 (7) and the jig 19 are subject to variation with respect to a predetermined dimension from the reference point, in other words, the pads 1 5 . It has been found that there is no practical problem as long as the eccentricity of the reference portion with respect to 35 is about 0.2 mm or less.

As described above, according to the present invention, by attaching the deflection yoke to the bulb, the center of the deflection yoke and the center of exposure can be aligned with each other with higher precision than in the conventional case, and the work of attaching the deflection yoke can be performed using the conventional process. This is possible with less man-hours compared to
Moreover, the above-mentioned matching accuracy can be improved without relying on a skilled engineer.

Furthermore, even if it is removed for some reason after it has been installed, it can simply be returned to the predetermined position, and no particularly large-scale adjustment work is required.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a conventional color picture tube bulb, FIG. 2 is a front view showing an embodiment of the color picture tube bulb of the present invention, and FIG. 3 is an enlarged view of part A in FIG. FIG. 4 is a third embodiment showing another embodiment of the color picture tube bulb of the present invention.
Figure 5 is an explanatory diagram of the eccentricity of the center of the reference line part of the conventional color picture tube bulb and the exposure center, and Figure 6 is the center of the reference line part of the color picture tube bulb of the present invention. FIG. 3 is a diagram illustrating coincidence of exposure centers. 1...Panel, 2...Funnel, 3
...Neck, 4...Reference line, 5, 15, 35...Pad, 6...
・Reference line, 8... Half, 9... Deflection yoke.

Claims (1)

[Scope of Claims] 1. A panel part, a funnel part in which a pad for positioning reference is provided at the end of the joint with the panel part, and a neck part joined to the end of the funnel part on the reference line side. A bulb for a color picture tube comprising: a reference surface of the pad is set based on a shape near a reference line portion. 2. A color image receiver comprising a panel section, a funnel section in which a pad for positioning reference is provided at the end of the joint with the panel section, and a neck section joined to the end of the funnel section on the reference line side. A method for manufacturing a bulb for a color picture tube, characterized in that the manufacturing method for a bulb for a color picture tube includes the step of grinding the reference surface of the pad based on the shape of the vicinity of the reference line portion.