JPH05114367A - Color picture tube - Google Patents

Abstract

(57) [Summary] [Structure] Fluorescent screen 3 formed on the inner surface of the panel 1 of the envelope.
The shadow mask 30 arranged so as to face the mask body 31 has a large number of electron beam passage holes and a skirt portion formed in the peripheral portion, and an inner projecting portion at one end. Mask frame welded and fixed to
In the color picture tube consisting of 32, the mask body is formed with an outer protruding portion formed by bending at least a part of the front end of the skirt portion to the outside, and the side wall portion opposite to the inner protruding portion is formed on the mask frame. At least a part of the end portion was bent outward to form an outer protruding portion that is opposed to the outer protruding portion of the mask body. [Effect] It is possible to provide a color picture tube that is less likely to cause color shift due to external vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube, and more particularly to a color picture tube having a shadow mask with improved vibration resistance.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 9, a color picture tube has an envelope including a panel 1 having a substantially rectangular convex spherical surface and a funnel-shaped funnel 2 integrally joined to the panel 1. , The inside of panel 1 emits blue, green, and red light 3
A phosphor screen 3 composed of a color phosphor layer is formed, and the phosphor screen 3 is formed.
A shadow mask 4 is arranged inside the shadow mask 4 so as to face the. In the neck 5 of the funnel 2, 3 electron beams
An electron gun 7 that emits 6B, 6G, and 6R is arranged. Then, the electron beams 6B, 6G, 6R emitted from the electron gun 7 are deflected by the magnetic field generated by the deflection yoke 8 mounted outside the funnel 2 to horizontally and vertically scan the fluorescent screen 3. A structure for displaying a color image is formed on the phosphor screen 3.

Normally, the shadow mask 4 has a structure as shown in FIG.
As shown in (a), a plate thickness of 0.1 in which a skirt portion 11 extending substantially parallel to the tube axis (Z axis) is formed around the main surface portion 10 in which a large number of electron beam passage holes are formed. .About.0.3 mm mask body 12 made of a cold rolled steel plate or the like and having a substantially rectangular convex spherical shape, and a side wall 13 substantially parallel to the tube axis with an inner protrusion 14 at one end. There is one in which a mask frame 15 having an L-shaped cross section of about 5 to 1.5 mm is integrally welded. Further, as shown in (b), in order to improve molding and mechanical strength, a bent portion 16 is provided in the peripheral portion of the main surface portion 10 where a large number of electron beam passage holes are formed, and a skirt is provided outside the bent portion 16. There is one in which a mask main body 12 having a portion 11 formed therein and a mask frame 15 having an L-shaped cross section in which an inner protruding portion 14 is formed at one end portion of a side wall portion 13 substantially parallel to the tube axis are integrally welded. .. Mask body 12 of these shadow masks 4
The welding between the mask frame 15 and the mask frame 15 is performed, for example, in FIG.
11, the horizontal axis (H axis), the vertical axis (V axis), the diagonal axis (D axis) of the mask body or the mask frame 15 and the other In position, its skirt 11 and mask frame 15
And the side wall portion 13 of the.

In these shadow masks 4, as shown in FIG. 9, a frame holder 17 made of a plurality of elastic members attached to the side wall portion 13 of the mask frame 15 is fixed to the inner surface of the side wall portion of the panel 1. Multiple stud pins 18
It is mounted on the inside of the panel 1 by being fitted and locked to.

By the way, when the color picture tube with the shadow mask 4 having the above-mentioned construction is incorporated into a television receiver, the vibration energy of the sound generated from the speaker incorporated in the television receiver is changed from the panel 1 to the stud. pin
18 → Frame holder 17 → Mask frame 15 → Skirt portion 11 → Transmitted to the main surface portion of the mask body 12. Therefore, when the natural frequency based on the material, shape, etc. of each of these parts and the frequency of the sound generated from the speaker that changes from time to time match, the parts resonate and vibrate.

The resonance vibration of the shadow mask 4 is shown in FIG.
As shown by the arrow 19 in 0 (b), the mask body is directly
When the main surface portion of 12 vibrates, and as shown by an arrow 20 in FIGS. 12 to 14, the mask frame 15 having large mechanical strength resonates with the mask body 12 to cause torsional vibration, and the vibration is generated. As shown in FIG. 14, the mask main body 12 and the mask frame 15 are welded to each other through the welding points and contact surfaces.
It may be transmitted to the main surface portion 12 of 12 and vibrate as indicated by an arrow 19.

Of these vibrations, the former vibration is determined by the material of the mask body 12, the shape of the curved surface, the strength of the curved surface, etc., so it is difficult to reduce the transmitted vibration energy and suppress the vibration. On the other hand, regarding the latter vibration,
By suppressing the vibration of the mask frame 15 or the transmission of the vibration, it is possible to reduce the vibration of the main surface portion of the mask body 12.

However, as in the conventional shadow mask 4 described above, in the structure in which the side wall portion 13 that is substantially parallel to the tube axis of the mask frame 15 is welded to the skirt portion 11 of the mask body 12 that extends substantially parallel to the tube axis, The vibration cannot be sufficiently suppressed, and the transmission of the vibration to the main surface portion of the mask body 12 cannot be sufficiently suppressed.

As a result, as shown in FIG. 15, the mask body 12 is displaced due to vibration as shown by the broken line 12a, and the electron beam 6 passing through the electron beam passage hole 21 of the shadow mask 4 is shown by 6a. As described above, the color shift is caused without properly landing on the predetermined phosphor layer 22. This color shift occurs even when the mask main body 12 resonates, but particularly when the mask frame resonates and the vibration is transmitted to the mask main body 12, it appears remarkably.

Conventionally, in order to suppress the vibration transmitted to the shadow mask 4, a method of sandwiching a support metal fitting for mounting a color picture tube in a cabinet with a vibration proof rubber or the like,
A method of attaching a vibration damper to the mask body or mask frame is known. However, these methods require an increase in the number of steps for assembling the television receiver and a complicated mechanism, which not only raises the price of the television receiver, but also increases the defective rate.

[0011]

As described above, in the conventional shadow mask of the color picture tube, the skirt portion extending substantially parallel to the tube axis in the peripheral portion of the mask body is almost aligned with the tube axis of the mask frame. The parallel side wall is formed by welding to form an integrated structure, and the frame holder attached to the side wall of the mask frame is fitted and locked to the stud pin fixed to the inner surface of the side wall of the panel. It is supported inside. When the shadow mask having such a structure is incorporated in a color picture tube and attached to a television receiver to operate, the vibration energy of the sound of the speaker is transmitted to cause resonance. This resonance is caused when the main surface of the mask body directly vibrates, and when the mask frame causes torsional vibration due to the resonance, and the vibration causes the vibration of the mask body through the welding point or the contact surface between the mask body and the mask frame. There is a case where it is transmitted to the main surface portion and vibrates, but in any case, when such a vibration occurs, the electron beam passes through the electron beam passage hole of the shadow mask, and then correctly reaches the predetermined phosphor layer. Does not land and causes color shift.

The present invention has been made to solve the above problems, and suppresses the vibration transmitted to the mask main body through the mask frame of the shadow mask to prevent the color shift due to the vibration of the mask main body. The purpose is to reduce the color picture tube.

[0013]

The shadow mask has a shadow mask arranged to face a fluorescent surface formed on the inner surface of the panel of the envelope, and the shadow mask has a large number of electron beam passage holes and a peripheral portion. In a color picture tube consisting of a mask body having a skirt portion formed on the mask body and a mask frame having an inward protruding portion formed at one end of the side wall portion and fixed to the skirt portion of the mask body by welding, the skirt portion is formed on the mask body. An outer bulge is formed by bending at least a part of the tip end to the outside, and at least a part of the side wall end opposite to the inner bulge is bent to the outside in the mask frame. The outer protruding portion is formed so as to be opposed to the outer protruding portion.

[0014]

As described above, at least a part of the tip of the skirt portion of the mask body is bent outward to form the outer overhanging portion, and the end of the side wall portion of the mask frame opposite to the inner overhanging portion is formed. When at least a part of the portion is bent outward to form the outer overhanging portion that is opposed to the outer overhanging portion of the mask body, the bending strength and the spring constant of the side wall portion of the mask frame increase. As a result, the bending vibration of the side wall of the mask frame and the increase of the spring constant suppress the torsional vibration of the mask frame. In addition, the bending strength and spring constant of the skirt portion of the mask body increases, and the bending strength and spring constant of the skirt portion of the mask body increase,
Even if the mask frame vibrates, the transmission to the mask body is suppressed, and a color picture tube that is less likely to cause color shift due to external vibration such as the sound of the speaker can be provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube which is one of the embodiments. This color picture tube has an envelope composed of a panel 1 having a substantially rectangular convex spherical surface shape and a funnel-shaped funnel 2 integrally joined to the panel 1, and an inner surface of the panel 1
A phosphor screen 3 formed of a three-color phosphor layer that emits blue, green, and red is formed, and a shadow mask 30 described below is arranged inside the phosphor screen 3 so as to face the phosphor screen 3. An electron gun 7 that emits three electron beams 6B, 6G, and 6R is arranged in the neck 5 of the funnel 2. Then, the electron beams 6B, 6G, 6R emitted from the electron gun 7 are deflected by the magnetic field generated by the deflection yoke 8 mounted outside the funnel 2 to horizontally and vertically scan the fluorescent screen 3. A structure for displaying a color image is formed on the phosphor screen 3.

The shadow mask 30 comprises a mask body 31 having a substantially rectangular convex spherical shape and a substantially rectangular mask frame 32 attached to the peripheral portion of the mask body 31. As shown in FIG. 2, the mask body 31 has a main surface portion 33 in which a large number of electron beam passage holes are formed, and a peripheral portion of the main surface portion 33 is bent to be substantially parallel to the tube axis (Z axis). The skirt portion 34 is extended in this way, and the outer bulge portion 35 is formed by bending the tip of the skirt portion 34 outward at a right angle so as to be substantially perpendicular to the tube axis. In particular, the mask body 31 in the illustrated example is
Cut grooves 36 are formed at the four corners of the skirt portion 34, and the cut grooves 36 divide the outer overhanging portion 35 into long and short sides and diagonal overhanging portions.

On the other hand, as shown in FIG. 3, the mask frame 32 has a side wall portion 37 substantially parallel to the tube axis and an end of the side wall portion 37 on the electron gun side substantially perpendicular to the tube axis. The inner overhanging portion 38 bent inward, and the outer overhanging portion in which the fluorescent screen side end portion (opposite end portion) of the side wall portion 37 is bent at right angles to the outside so as to be substantially perpendicular to the tube axis. It consists of 39 and. In particular, the mask frame 32 in the illustrated example has notches 40 at the four corners of the outer overhang 39.
The outer overhanging portion 39 is divided into the long side, the short side, and the diagonally extending portions by the notches 40.

As shown in FIGS. 4 and 5, the mask main body 31 and the mask frame 32 are abutted at their respective outer protruding portions 35 and 39, and each axis such as a horizontal axis, a vertical axis, and a diagonal axis. Point 41 between the long sides, short sides, and diagonal bulges near the edges.
It is welded and integrated as shown in. Then, the frame holder 17 made of a plurality of elastic bodies attached to the side wall portion 37 of the mask frame 32 and the plurality of stud pins 18 fixed to the inner surface of the side wall portion of the panel 1 are fitted and locked to each other, whereby the panel It is installed inside 1.

When the mask frame 32 is provided with the outer projecting portion 39 as described above, the bending strength and the spring constant of the side wall portion 37 in the tilting direction (direction perpendicular to the tube axis) are significantly increased.
Further, also in the mask body 31, if the outer overhanging portion 35 is provided, the bending strength and the spring constant of the skirt portion 34 in the falling direction (direction perpendicular to the tube axis) similarly increase. Therefore, if such a mask body 31 and a mask frame 32 are combined to form a shadow mask 30 and incorporated into a color picture tube, even if external vibration such as the sound of a speaker is applied, the mask frame 32 is indicated by an arrow in FIG. The torsional vibration shown by 20 is unlikely to occur, and even if the torsional vibration of the mask frame 32 occurs, it is difficult to transmit it to the main surface portion of the mask main body 31.
The color misregistration caused by the vibration of the shadow mask 30 shown by 19 can be significantly reduced.

That is, when an external vibration such as a voice of a speaker is applied to the color picture tube, the vibration energy is transmitted to the mask frame through the panel → stud pin → frame holder, and the vibration frequency and the natural vibration of the mask frame. When the numbers match, the side wall portion of the mask frame causes torsional vibrations in various modes as shown in FIGS. 12 to 14, but if the side wall portion 37 is provided with the outer projecting portion 39 as described above, the side wall portion The bending strength and spring constant of the portion 37 in the tilt direction are significantly increased, the natural frequency of the torsional vibration of the mask frame 32 is increased, and the amplitude is reduced. Also, the torsional vibration of the mask frame 32 causes a welding point 40 with the mask body 31.
The mask main body 31 is excited through the contact portion or the contact portion. However, since the skirt portion 33 of the mask main body 31 is provided with the outer projecting portion 35, the bending strength and spring constant of the skirt portion 34 in the falling direction are increased. However, the transmission of the torsional vibration of the mask frame 32 to the main surface portion 33 of the mask body 31 is suppressed. Further, the outer projecting portion 35 of the mask body 31 increases the strength of the skirt portion 34 of the mask body 31, and also damps the vibration directly transmitted to the main surface portion 33 of the mask body 31 via the mask frame 32. .. As a result, the color shift due to the vibration of the shadow mask 30 is significantly reduced.

Although the mask body and the mask frame are provided with the outer bulging portions over the entire lengths of the long sides, the short sides, and the diagonal portions, respectively, in the above embodiment, these outer bulging portions are provided. However, it is not always necessary to provide the same along the entire length of the peripheral edge, and the same effect can be obtained by providing it only on a part of the long side, the short side or the like.

Further, in the above embodiment, the shadow mask having a shape close to a rectangle has been described, but as shown in FIGS. 7A and 7B, the long sides of the mask body and the mask frame 32 are arranged.
For a shadow mask in which 42 and the short side 43 are curved to have a concave or convex surface, if the skirt portion or the side wall portion is provided with the outer protruding portion 35 (or 38), the bending strength due to the concave or convex curved surface is obtained. In addition to the increase of the spring constant and the spring constant, the bending strength and the increase of the spring constant due to the formation of the outer overhanging portion are added, so that the shadow mask having a significantly high vibration suppressing effect can be obtained.

Further, in the above-described embodiment, the mask body and the mask frame are provided with outer bulging portions perpendicular to the tube axis and welded at the respective outer bulging portions. However, the shadow mask shown in FIG. , The mask body 31 and the mask frame 32, and the outer protruding portions 35 and 39, the skirt portion 34 and the side wall portion 37.
With respect to α ₁ and α ₂ , respectively, and α ₁ + α
₂ > 180 °, a cut groove 44 is formed in the skirt portion 34 of the mask main body 31, and a tongue piece portion 45 is provided by extending a part of the notch portion like the outer protruding portion 34 without bending. The mask body 31 and the mask frame 32 are welded to each other at the outer protruding portions 35 and 39, the tongue piece portion 45 and the side wall portion 35.

When the shadow mask is constructed in this way,
The mask body 31 can be attached to the mask frame 32 at an appropriate position. That is, it is desired that the assembly of the shadow mask can be finely adjusted so as to absorb the molding error of the mask body 31 and the mask frame 32 and to optimize the distance between the inner surface of the panel and the main surface portion of the mask body 31. ..
On the other hand, when the outer protruding portions of the mask body and the mask frame are provided perpendicularly to the tube axis as in the above-described embodiment, the adjustment allowance when the mask body and the mask frame are welded and integrated with each other. However, with the configuration as in this example, since the gap s is formed between the outer protruding portion 35 of the mask body 31 and the outer protruding portion 39 of the mask frame 32, the skirt portion 34 of the mask body 31 is formed. By utilizing the elasticity of the bent portion between the outer protruding portion 35 and the outer protruding portion 35, by adjusting the gap between the outer protruding portions 35, 39, by welding the tongue piece portion 45 to the side wall portion 37, The effect that the mask main body 31 can be easily attached at an appropriate position is obtained.

[0026]

EFFECT OF THE INVENTION At least a part of the front end of the skirt portion of the mask body of the shadow mask which is arranged to face the fluorescent surface formed on the inner surface of the panel is bent outward to form the outer protruding portion, and At least a part of the end opposite to the inner overhang formed on one end of the side wall of the mask frame is bent outward to form an outer overhang opposite the bent part of the mask body. Then, the bending strength and the spring constant of the skirt portion of the mask main body and the side wall portion of the mask frame can be increased, the torsional vibration of the mask frame can be suppressed, and the vibration of the mask frame can be suppressed from being transmitted to the mask main body. A color picture tube that is less likely to cause color shift due to external vibration such as the sound of a speaker can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a color picture tube which is an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a mask body of the shadow mask.

FIG. 3 is a perspective view showing a structure of a mask frame of the shadow mask.

FIG. 4 is a perspective view showing a configuration of a shadow mask in which the mask body and a mask frame are combined.

FIG. 5 is an enlarged view showing a main configuration of the shadow mask.

FIG. 6 is a diagram for explaining vibration applied to the shadow mask.

FIGS. 7A and 7B are views for explaining a shadow mask having long sides and short sides curved, respectively.

FIG. 8A is a sectional view showing a main structure of a shadow mask in which a tongue piece is formed on a skirt portion of a mask body, and FIG. 8B is a front view thereof.

FIG. 9 is a diagram showing a configuration of a conventional color picture tube.

FIG. 10 (a) is a diagram showing a configuration of an example of a shadow mask mounted on the conventional color picture tube, FIG.
(B) is a figure which shows the structure of a different shadow mask.

11 (a) is a plan view showing welding points between the mask body and the mask frame of the shadow mask, FIG.
(B) is a sectional view of the same.

12A and 12B are diagrams for explaining torsional vibration of the mask frame of the shadow mask caused by external vibration.

13A and 13B are diagrams for explaining torsional vibrations in different modes of the mask frame of the shadow mask, which are caused by external vibrations.

14A and 14B are diagrams for explaining torsional vibrations in different modes of the mask frame of the shadow mask, which are caused by external vibrations.

FIG. 15 is a diagram for explaining color shift caused by vibration of the mask body of the shadow mask.

[Explanation of symbols]

 1 ... Panel 3 ... Fluorescent screen 7 ... Electron gun 17 ... Frame holder 18 ... Stud pin 30 ... Shadow mask 31 ... Mask body 32 ... Mask frame 33 ... Main surface part 34 ... Skirt part 35 ... Outer overhang part 37 ... Side wall part 38 … Inner overhang 39… Outer overhang 42… Long side 43… Short side

Claims (1)

[Claims] 1. A shadow mask arranged to face a phosphor screen formed on an inner surface of a panel of an envelope, wherein the shadow mask has a large number of electron beam passage holes and a skirt portion at a peripheral portion. A color picture tube comprising a formed mask body and a mask frame having an inward projecting portion formed at one end of a side wall portion and welded and fixed to the skirt portion of the mask body, wherein the mask body has a tip of the skirt portion. An outer protrusion is formed by bending at least a part of the portion outward, and at least a part of the side wall end opposite to the inner protrusion is bent outward in the mask frame. A color picture tube, characterized in that an outer overhanging portion is formed opposite to the outer overhanging portion of the mask body.