JPS5913824B2 - color picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube, and more particularly to a color picture tube having an improved color selection electrode assembly.

In general, color picture tubes emit light in two or more colors on the inside.
It has an envelope consisting of a panel coated with a light body and a funnel which is welded to the side edge of this panel through a frit glass or the like and has a neck section in which an electron gun is built-in.

(・A color selection electrode assembly is arranged between the light body and the electron gun, so that multiple electron beams emitted from the electron gun will strike the corresponding light body.) It has a color sorting function.

By the way, the conventional color selection electrode assembly consists of a shadow mask consisting of an electron beam transmitting part shaped to have almost the same shape as the inner surface of the panel, a side wall part bent from the periphery almost parallel to the tube axis, and Consists of a support frame fixed to reinforce the side wall portion of the mask, and a support device consisting of a plurality of leaf springs, one end of which is attached to the support frame, and the other end of which is engaged with a pin embedded in the inner surface of the panel side wall. It's been done ~・ru.

The support frame has a plate thickness of approximately 21rr.
It is made by bending an iron strip about rn in cross-section into a cross-sectional shape, and then processing it so that it has almost the same inner diameter as the side wall of the shadow mask, and is extremely heavy compared to the weight of the shadow mask itself.

For this reason, a support device made of a leaf spring must be strong and structured, and while a 20-type shadow mask normally weighs about 130 volts, the color selection electrode assembly as a whole weighs about 900 volts.

Then, these weights/support frames and strong (・
The structural support system has been a major impediment to reducing the manufacturing costs of color picture tubes.

Furthermore, during operation of a color picture tube, it is common to scan 5 to 10 thiovers from the area where the photoreceptor is coated, and these overscanned electron beams (or supports) After colliding with the frame, there is a burr (1), which passes between the support frame and the inside of the panel and enters the beam/light surface.

However, since the amount of light emitted by these unnecessary electrons significantly impairs the image quality, generally an electron shield made of a thin metal plate is placed to block these unnecessary electrons. .

This electron shield is attached to the support frame by welding during the color picture tube manufacturing process.
There were drawbacks such as defects caused by splashes during welding and damage to the optical surface, which together with parts costs and installation costs, became a major obstacle to reducing manufacturing costs.

The present invention was made in view of the above-mentioned conventional circumstances, and it significantly reduces the manufacturing cost of color picture tubes by providing an electron shielding function to a lightweight support frame formed from a thin metal plate. It is designed so that it can be lowered.

Hereinafter, the present invention will be described in detail along with embodiments shown in the drawings.

FIG. 1 explains one embodiment of the present invention.
The panel 2 of the color picture tube, which is indicated by the reference numeral 1 as a whole, constitutes an envelope that is welded with a funnel 3 and a frit glass 4, etc., and a light surface 5 is formed on the inner peripheral surface of the panel 2. It's been...

A shadow mask 6 made of a steel plate is arranged at a predetermined distance from the inner peripheral surface of the panel 2, and this shadow mask 6 includes a perforated portion 6a shaped approximately along the inner surface of the panel 2 and its surroundings. It has a side wall portion 6b bent in the tube axis direction of the panel 2 along the tube axis.

On the other hand, what is indicated by the reference numeral 7 is a reinforcing frame which is a main part of the present invention, and is press-formed from a thin metal plate, for example, a mild steel plate with a thickness of about 0.1 to 0.2 mm. a first horizontal portion 8 substantially perpendicular to the tube axis and a side wall 6b of the shadow mask 6;
the first side wall portion 9 and the first horizontal portion 8 welded to the
a second horizontal portion 10 bent horizontally in the opposite direction;
A second side wall portion 1 formed at a side end of this second horizontal portion 9
1.

The first horizontal portion 8 functions to block unnecessary overscanned electrons as shown in FIG.

The first side wall portion 9 is the side wall 6b of the shadow mask 6.
The second horizontal portion 10 enters through the gap between the side wall 7 of the shadow mask 6 and the inner wall of the panel 2, and strikes the light surface 5, causing unnecessary light emission. The second side wall 11 is bent along the side wall of the panel 2, and the gap between it and the panel side wall is as small as 1 to 2 inches. A safe distance is maintained.

It should be noted that the width of the second side wall portion 110 is preferably long, but it has been confirmed that a width of 3 m or more is sufficient.

In addition to the above-mentioned mild steel plate, various materials such as stainless steel can be used as the material for the reinforcing frame.
It is preferable to use a material that has the same coefficient of thermal expansion as the shadow mask.

It goes without saying that the plate thickness is not limited to the above example.

4 and 5 illustrate another embodiment of the present invention, in which the same parts as in FIGS. 1 to 3 are designated by the same reference numerals.

Since the reinforcing frame 7 according to the present invention is made of a thin metal plate, there is a risk that it may be deformed by external force during the nodding process during the manufacturing process of a color picture tube.

Therefore, in this embodiment, several ribs 12 having an arcuate cross section are formed on the first horizontal portion 8 to prevent deformation.

The presence of this rib is particularly effective in the case of a 110° deflection type color picture tube, since it is necessary to widen the width of the first horizontal portion.

FIG. 6 illustrates still another embodiment of the present invention,
In this figure, the same parts as in FIGS. 1 to 3 are designated by the same reference numerals.

In this embodiment, the inside of the first horizontal portion 8 of the reinforcing frame 7 has a shadow mask 6 with a constant angle α over the entire circumference.
It has a bent portion 8a that is bent in a direction away from.

Due to the existence of such a bent portion 8a, as shown in FIG. Even if it is reflected back, it can be prevented from colliding with the inner surface 8a of the bending part 8a and entering the light surface 5, and the overall strength of the reinforcing frame 7 made of a thin metal plate can be improved. can get.

Therefore, the width of the bent portion 8a is set to a size that can sufficiently cover these intended areas.

In addition, it goes without saying that this bending angle α sufficiently covers the intended purpose of the above-mentioned bending portion 8a;
It must be determined that at least the portion directly collided with the electron beam emitted from the electron gun should be the outer surface 8a1 of the bent portion 8a.

FIG. 7 explains the structure of a support device for engaging and holding the shadow mask 6 with the pins on the side wall of the panel. In this embodiment, the leaf spring 14, which is the support device, is formed symmetrically. spot welding 1 through the bent portions 15 at both ends.
6 or the like to the side wall 6b of the shadow mask 6.

The central part of the leaf spring 14 is a horizontal part 11 that projects outward.
A through hole 18 is formed in the center of this horizontal portion 17 slightly downwardly to fit into a pin on the panel side.

The lower end of the leaf spring 17 is tongue-shaped and protrudes downward, and is located at a position corresponding to the horizontal portion 11 (the second horizontal portion 10 of the reinforcing frame 7, the second side wall). A recess 19 is formed in the portion 11.

The total length and depth of this concave portion 19 must be as short as possible, and the unnecessary electrons overscanned from this portion (“injected into the optical surface” should be minimized). I can't hold it back (Naru).

However, it can be understood that since the water fang portion 17 of the leaf spring 14 extends downward from the recess 19, it also has the effect of blocking unnecessary electrons.

Note that, of course, the shape of the leaf spring is not limited to the above-mentioned example.

From the above explanation, it is clear that according to this statement, light (
・By bending the metal plate, the electron shield that blocks unnecessary electrons can be formed integrally with the reinforcing plate, making it much lighter than conventional support frames.
It can be simplified, greatly contributes to lower manufacturing costs such as reducing manufacturing man-hours and parts, and has high reliability (・
, it is possible to obtain a color picture tube that produces images with excellent color purity.

In addition, since the reinforcing frame is lighter than conventional support frames, the leaf spring that engages and holds the shadow mask assembly inside the handle may be lightweight and have a simple structure.
Furthermore, the plate thickness of the reinforcing frame is thinner than that of the support frame, which makes welding the reinforcing frame and other parts easier, and also makes it easier to attach and detach the panel and shadow mask assembly. The present invention has excellent features such as the disadvantages of deformation caused by external forces, such as deformation caused by contacting the shadow mask assembly with other parts, which occurred when attaching and detaching the shadow mask assembly. It is effective.

In the above-mentioned embodiments, the shadow mask and the reinforcing frame were described as separate bodies, but it is also possible to extend the side wall portion of the shadow mask so that it also functions as a bending reinforcing frame.

[Brief explanation of the drawing]

Figures 1 to 3 illustrate one embodiment of the present invention.
Fig. 1 is a perspective view of the main part, Fig. 2 is a bottom view of the entire book of the main part, Fig. 3 is a longitudinal sectional side view of the main part, and Figs. 4 and 5 are bottom views of other embodiments of the present invention. FIG. 6 is a vertical sectional side view of another embodiment of the present invention, and FIG. 7 is a perspective view showing the dimensional structure of the leaf spring. 1.・Color picture tube, 2...panel, 3...funnel, 4...frit glass, 5...edge (・light surface, 6...shadow mask, 7...-reinforcement frame, 8...
・First horizontal part, 9... First side wall part, 10... Second horizontal part, 11... Side wall part of position 2, 12... Lip, 14... Leaf spring, 15...Bending part, 16...Spot welding part, 17...Horizontal part, 18...Through hole, 19
...concavity. 104-

Claims (1)

[Scope of Claims] 1. Consists of a panel with an optical surface formed on the inside, and a funnel section connected to this panel and housing an electron gun in its neck. A color picture tube has a color selection electrode assembly between it and the gun. and a shadow mask having a perforated part formed in a substantially spherical shape along the inner surface of the panel, and a side wall part bent along the side wall of the panel around the perforated part; A first side wall portion is formed to have a constant width and approximately the same size as the inner wall of the side wall portion of this shadow mask, and is welded and fixed to the side wall portion of the shadow mask. a first horizontal portion bent vertically; a second horizontal portion bent outward at a substantially right angle at the other end of the first side wall portion; A color picture tube comprising a reinforcing frame having a second side wall portion bent at a substantially right angle from the outer periphery of the horizontal portion toward the electron gun. 2. Claims For the color picture tube described in item 1 (・
A color picture tube characterized in that a reinforcing rib is formed on the first horizontal portion of the reinforcing frame. 3. In the color picture tube set forth in claim 1.
Then, at least a part of the inner peripheral edge of the first horizontal part of the reinforcing frame is bent toward the electron gun at a certain angle, and unnecessary electrons overscanned only strike the side surface of this bent part on the electron gun side. A color picture tube characterized in that it is configured to. 4. In the color picture tube according to claim 1, 2, or 3, a second reinforcing frame is provided in a portion corresponding to a leaf spring attached to a side wall portion of the shadow mask. A color picture tube characterized in that a concave portion bulging inward is formed in the horizontal portion and the second side wall portion.