JP3640757B2 - Aperture grill and color selection electrode assembly using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aperture grill constituting a color selection electrode assembly used in a color cathode ray tube.
[0002]
[Prior art]
In a color cathode ray tube, a color selection electrode assembly having a color selection electrode is disposed in the vicinity of a phosphor surface so that an electron beam emitted from an electron gun reaches only a specific color phosphor. This color selection electrode is a thin metal plate provided with a slit through which an electron beam passes, and there are several types depending on the slit shape and its arrangement. As one of such color selection electrodes, there is one called an aperture grill in which a large number of linear slits arranged in a vertical direction are arranged at a predetermined interval. As a color selection electrode assembly using the aperture grill, there is a structure in which the aperture grill is stretched by an elastic frame.
[0003]
FIG. 3 is a perspective view showing an example of a color selection electrode assembly using a conventional aperture grill 10. 4 is a partial structural view of the conventional aperture grill 10 shown in FIG. 3, wherein (a) is a partial perspective view and (b) is a cross-sectional view taken along line AA of (a). The color selection electrode assembly shown in FIG. 3 includes an aperture grill 10, a frame 2, and a damper mechanism (hereinafter referred to as a damper) 3. The frame 2 includes a pair of support bars 21 facing each other and a pair of elastic supports 22 attached between the support bars 21.
[0004]
The aperture grill 10 is formed by forming slits 12 at a predetermined interval on a thin metal plate, and a thin metal plate portion sandwiched between the slits 12 forms a grid element body (hereinafter referred to as a grid) 11. Both ends in the horizontal direction of the aperture grill 10 are called tape portions 103, and the width of the tape portions 103 is wider than the width of the grid 11. The aperture grill 10 is attached to the frame 2 with the back surfaces of both edges in the vertical direction fixed to the support rod 21 having the curvature radius Rz.
[0005]
In the color cathode ray tube using the color selection electrode structure shown in FIG. 3, when the grid 11 of the aperture grill 10 vibrates due to external vibration and impact, color deviation appears. The damper 3 is provided to suppress vibrations of the individual grids 11 of the aperture grill 10, and includes a damper spring 31 attached to the elastic support 22 and a damper wire 32. The end of the damper wire 32 is welded to the damper spring 31 and is stretched so as to cross the surface of the aperture grill 10 along the curvature radius Rz of the support rod 21 in the horizontal direction. Are in contact with each other.
[0006]
[Problems to be solved by the invention]
As described above, since the damper wire 32 is stretched perpendicularly to the grid 11 and the tape portion 103 of the aperture grill 10, if the tape portion 103 is twisted and deformed in the manufacturing process of the color cathode ray tube, as shown in FIG. The tape portion 103 lifts the damper wire 32 and the damper wire 32 is lifted from the surface of the grid 11. If the damper wire 32 is not in contact with the surface of the grid 11, the grid 11 vibrates due to external vibration and impact, and appears as a color shift of the color cathode ray tube.
[0007]
The present invention has been made to solve such a conventional problem. Even when the tape portion is twisted, the damper wire can be held in contact with the grid surface, and the grid vibrates. It is an object of the present invention to provide an aperture grill and a color selection electrode assembly that can prevent color misregistration of a color cathode ray tube caused by the above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the aperture grill of the present invention has a large number of grid elements arranged at predetermined intervals in a region between tape portions of predetermined widths provided at both ends in the horizontal direction. In the aperture grill where the damper wire is stretched so as to cross the surface in the horizontal direction when the color selection electrode structure is configured, the thin plate portion having a thickness smaller than that of the grid element body in the tape portion The thin plate portion includes an end portion on the grid element body side of the tape portion in a stretched region of the damper wire, and is formed so as to form a recess with respect to the surface of the aperture grill. To do.
[0009]
Here, the surface of the thin plate portion is, for example, a flat surface or a convex curved surface formed parallel to the aperture grille surface or inclined toward the grid element body.
[0010]
Further, the color selection electrode assembly of the present invention is provided in the aperture grill of the present invention, a frame that supports the aperture grill by fixing the back surfaces of both edges in the vertical direction of the aperture grill, and the frame. A taper portion comprising a damper spring and a damper wire having both ends fixed to the damper spring, and a damper mechanism that suppresses vibration of the grid element body by stretching the damper wire on the surface of the aperture grill. The damper wire is stretched so as to pass through the thin plate portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1A and 1B are partial structural views of an aperture grill 1 showing Embodiment 1 of the present invention, in which FIG. 1A is a partial perspective view, and FIG. 1B is a cross-sectional view taken along line AA in FIG. However, FIG. 1 is a diagram showing the aperture grill 1 when the color selection electrode assembly is configured together with the frame 2 and the damper 3 shown in FIG. 3, and is not a diagram showing the single aperture grill 1. When the color selection electrode assembly is configured, both edges in the vertical direction of the back surface 1b of the aperture grill 1 are fixed to the support rod 21, and the damper wire 32 is stretched on the planned damper wire extension region 1c on the front surface 1a. .
[0012]
First, the single aperture grill 1 before constituting the color selection electrode structure will be described. The aperture grill 1 has tape portions 13 each having a predetermined width at both ends in the horizontal direction, and a plurality of grids 11 arranged in the region between the tape portions 13 at predetermined intervals in the horizontal direction. It has a sandwiched slit 12. The grid 11 and the slits 12 are linear electrodes and through holes elongated in the vertical direction. A thin plate portion 13 a is provided in the planned damper wire extension region 1 c of the tape portion 13. The details of the thin plate portion 13a will be described later.
[0013]
The aperture grill 1 uses, for example, a rectangular metal flat plate, leaves portions to be the tape portions 13 at both ends in the horizontal direction of the metal flat plate, and forms a large number of slits 12 at predetermined intervals. It is manufactured by setting the sandwiched portion as the grid 11. The slit 12 is formed using, for example, a chemical etching method.
[0014]
Assuming that the aperture grill 1 is made of a metal flat plate having a thickness t, the aperture grill front surface 1a and the aperture grill back surface 1b are two planes that are parallel to each other at a distance t. The surface of the tape portion 13 excluding the surface of the grid 11 and the thin plate portion 13a is included in the aperture grill surface 1a, and the back surface of the grid 11 and the back surface of the tape portion 13 are included in the aperture grill back surface 1b.
[0015]
The thickness of the thin plate portion 13a of the tape portion 13 is smaller than the plate thickness t of the grid 11 so that the surface of the thin plate portion 13a is concave with respect to the aperture grill surface 1a. The thin plate portion 13a is formed, for example, by half-etching or cutting the surface of the tape portion 13 using a chemical etching method.
[0016]
The thin plate portion 13 a is provided in the entire area of the damper wire extension planned region 1 c of the tape portion 13. The surface of the thin plate portion 13a of the tape portion 13 is a plane parallel to the aperture grill surface 1a, and the surface of the thin plate portion 13a and the grid side end portion 13c are located in the space between the aperture grill surface 1a and the aperture grill back surface 1b. To do.
[0017]
Next, a manufacturing process of the color selection electrode assembly using the single aperture grill 1 will be briefly described. The aperture grill 1 is attached to the frame 2 by fixing both edges in the vertical direction of the aperture grill back surface 1b to the support rod 21 of the frame 2 shown in FIG. Next, the damper wire 32 is stretched on the damper wire extension planned region 1c of the aperture grill surface 1a, and both ends of the damper wire 32 are welded to the damper springs 31 provided on the frame 2, respectively. At this time, the damper wire 32 comes into contact with the grid 11 and the thin plate portion 13a of the tape portion 13, respectively. In this way, a color selection electrode assembly is manufactured, and a color cathode ray tube is manufactured using this color selection electrode assembly.
[0018]
During the manufacturing process of the color cathode ray tube, the tape portion 13 is twisted and the end portion of the tape portion 13 is lifted with respect to the aperture grill surface 1a (here, the curved surface conforms to the radius of curvature Rz of the support rod 21). The wire 32 is lifted and the damper wire 32 is lifted from the surface of the grid 11. The amount of twist of the tape portion 13, that is, the amount of floating of the end portion of the tape portion 13 varies depending on the inch size of the aperture grill 1, the plate thickness t, the width of the tape portion 13, the tension of the damper wire 32, and the like. Further, the torsional deformation of the tape portion 13 always occurs in the direction in which the grid side end portion 13b is lifted as shown in FIG. 1 irrespective of the inch size of the aperture grill 1, the plate thickness t, the tension force, and the like. That is, in FIG. 1 (b), the tape portion 13 always twists clockwise.
[0019]
By setting the plate thickness of the thin plate portion 13a of the tape portion 13 so that the grid-side end portion 13c does not float from the aperture grill surface 1a even if the tape portion 13 is twisted and deformed, the damper wire 32 is grid-off. 11 can be prevented from floating from the surface. Here, determining the thickness of the thin plate portion 13a determines the height dimension from the surface of the thin plate portion 13a to the aperture grill surface 1a (the depth dimension of the recess formed in the aperture grill surface 1a by the thin plate portion 13a). It is none other than.
[0020]
For example, in the aperture grill 1, when the plate thickness t is 100 [μm], the width of the tape portion 13 is 3 [mm], and the inch size is 21 inches, the grid side end portion caused by torsional deformation of the tape portion 13 The floating amount of 13b, that is, the floating amount of the damper wire 32 is about 40 [μm]. At this time, if the plate thickness of the thin plate portion 13a is set to 50 [μm], that is, the height dimension from the surface of the thin plate portion 13a of the tape portion 13 to the aperture grill surface 1a is set to 50 [μm], the tape portion 13 is twisted and deformed. Even if it occurs, the grid-side end portion 13c does not float from the aperture grill surface 1a, and the state where the damper wire 32 is in contact with the surface of the grid 11 can be maintained. Thereby, even if torsional deformation occurs in the tape portion 13, the vibration of the grid 11 can be prevented, and the color shift of the color cathode ray tube due to the vibration of the grid 11 can be prevented.
[0021]
The color Braun tube using the aperture grill 1 provided with the thin plate portion 13a in the tape portion 13 and the color Braun tube using the conventional aperture grill without the thin plate portion 13a are generated due to the vibration of the grid 11. The degree of color shift phenomenon of color CRT was investigated. The inch size was 21 inches for both the aperture grill 1 and the conventional aperture grill. The vibration of the grid 11 is generated by external vibration or impact. If the damper wire 32 is in contact with the surface of each grid 11 and is not lifted, vibration of the grid 11 can be prevented. A plurality of color cathode ray tubes using the aperture grill 1 and a plurality of color cathode ray tubes using the conventional aperture grill were manufactured, and the degree of color shift when each of these color cathode ray tubes was vibrated was investigated. Although the details of the investigation method are omitted, the color CRT using the aperture grill 1 has a smaller degree of color shift, that is, the effect of suppressing the color shift is larger than the color CRT using the conventional aperture grill. understood.
[0022]
As described above, according to the first embodiment, the damper wire stretch planned region 1c of the tape portion 13 of the aperture grill 1 is provided with the thin plate portion 13a that is recessed with respect to the aperture grill surface 1a, and passes through the thin plate portion 13a. By stretching the damper wire 32 in such a manner, the damper wire 32 can be held in contact with the surface of the grid 11 even if the tape portion 13 is torsionally deformed, thus preventing vibration of the grid 11. Therefore, the color shift of the color CRT caused by the vibration of the grid 11 can be prevented.
[0023]
In the first embodiment, the thin plate portion 13a is partially formed in the planned damper wire extension region 1c of the tape portion 13, but may be formed on the entire surface of the tape portion 13. Further, the thin plate portion 13a may be formed in a partial region including the grid side end portion 13b instead of the entire damper wire extension planned region 1c. Further, the surface of the thin plate portion 13a is not limited to a plane parallel to the aperture grill surface 1a, and may be inclined or a convex curved surface.
[0024]
Embodiment 2. FIG.
2A and 2B are partial structural views of an aperture grill 4 showing Embodiment 2 of the present invention, in which FIG. 2A is a partial perspective view, and FIG. 2B is a cross-sectional view taken along line AA of FIG. However, FIG. 2 is a diagram showing the aperture grill 4 when the color selection electrode assembly is configured together with the frame 2 and the damper 3 shown in FIG. 3, and is not a diagram showing the single aperture grill 4. When the color selection electrode assembly is configured, both edges in the vertical direction of the back surface 1b of the aperture grill are fixed to the support rod 21, and the damper wire 32 is stretched on the planned damper wire extension region 1c on the surface 1a of the aperture grill. .
[0025]
The aperture grill 4 has tape portions 43 having the same width as the tape portion 13 of the aperture grill 1 shown in FIG. 1 at both ends in the horizontal direction. The damper wire extension planned region 1c of the tape portion 43 is provided with a thin plate portion 43a whose thickness is inclined to the grid 11 side so as to be concave with respect to the aperture grill surface 1a. The thin plate portion 43a is formed, for example, by half-etching or cutting the surface of the tape portion 43 using a chemical etching method.
[0026]
The thin plate portion 43 a is provided not in the entire damper wire extension planned region 1 c of the tape portion 43 but in a partial region on the grid 11 side including the grid side end portion 43 b of the tape portion 43. The surface of the thin plate portion 43a is a plane that is inclined with respect to the aperture grill surface 1a so as to be farther from the aperture grill surface 1a as it approaches the grid side end portion 43c. The grid side end portion 43c of the thin plate portion 43a is located in a space between the aperture grill surface 1a and the aperture grill back surface 1b, and the end portion 43d on the side facing the grid side end portion 43c is included in the aperture grill surface 1a. The back surface of the thin plate portion 43a is included in the aperture grill back surface 1b.
[0027]
A color selection electrode assembly is manufactured using the single aperture grill 4 in the same manner as in the first embodiment, and a color cathode ray tube is manufactured using the color selection electrode assembly. In the color cathode ray tube manufacturing process, the tape portion 43 is torsionally deformed in the same manner as the tape portion 13 of the first embodiment, but the thickness at the grid side end portion 43c of the thin plate portion 43a is twisted to the tape portion 43. The damper wire 32 can be prevented from floating from the surface of the grid 11 by setting the plate thickness so that the grid side end portion 43c does not float from the aperture grill surface 1a even if it occurs.
[0028]
For example, in the aperture grill 4, when the plate thickness t is 100 [μm], the width of the tape portion 43 is 3 [mm], and the inch size is 21 inches, the tape portion 43 of the tape portion 43 caused by torsional deformation is generated. The floating amount of the grid side end portion 43b, that is, the floating amount of the damper wire 32 is about 40 [μm] as in the first embodiment. At this time, if the plate thickness at the grid side end 43c of the thin plate portion 43a is 50 [μm], that is, the height dimension from the grid side end 43c to the aperture grill surface 1a is 50 [μm], the tape portion 43 Even if torsional deformation occurs, it is possible to maintain the state in which the damper bar 32 is in contact with the surface of the grid 11. Therefore, the vibration of the grid 11 can be prevented, and the color shift of the color cathode ray tube can be prevented.
[0029]
As described above, according to the second embodiment, the damper wire stretch planned region 1c of the tape portion 43 of the aperture grill 4 has a concave portion with respect to the aperture grill surface 1a, and the surface is inclined toward the grid 11 side. By providing the damper wire 32 so as to pass through the thin plate portion 43a, the damper wire 32 can be kept in contact with the surface of the grid 11 even if the tape portion 43a is twisted. Therefore, similarly to the first embodiment, the vibration of the grid 11 can be prevented, and the color shift of the color cathode ray tube caused by the vibration of the grid 11 can be prevented.
[0030]
In the second embodiment, the thin plate portion 43a is formed in the partial region including the grid-side end portion 43b in the damper wire extension planned region 1c, but may be formed in the entire damper wire extension planned region 1c. . Further, the thin plate portion 43 a may be formed on the entire surface of the tape portion 43. Further, the surface of the thin plate portion 43a may be a convex curved surface instead of a flat surface.
[0031]
【The invention's effect】
As described above, according to the present invention, the grid portion of the aperture grille includes the end on the grid element side in the region where the damper wire is to be stretched, and forms a recess with respect to the aperture grill surface 1a. By providing a thin plate portion thinner than the plate thickness and stretching the damper wire so as to pass through this thin plate portion, the damper wire was brought into contact with the grid element surface even if the tape portion of the aperture grill was torsionally deformed. Since the grid body can be kept in a state, the grid element body can be prevented from vibrating, and the color cathode ray tube color shift caused by the grid element body vibration can be prevented.
[Brief description of the drawings]
FIG. 1 is a partial perspective view and a partial cross-sectional view of a grid element body and a tape portion in an aperture grill according to a first embodiment of the present invention.
FIGS. 2A and 2B are a partial perspective view and a partial cross-sectional view of a grid element body and a tape portion in an aperture grill according to a second embodiment of the present invention.
FIG. 3 is a perspective view showing a color selection electrode assembly using an aperture grill.
FIG. 4 is a partial perspective view and a partial cross-sectional view of a grid element body and a tape portion in a conventional aperture grill.
[Explanation of symbols]
1, 4 Aperture grill, 1a Aperture grill surface, 1b Aperture grill back surface, 1c Damper wire extension planned area, 2 Frame, 3 Damper mechanism, 11 Grid element, 13, 43 Tape part, 13a, 43a Thin plate part, 13b, 43b Tape part grid side edge part, 13c, 43c Thin plate part grid side edge part, 21 Support rod, 22 Elastic support body, 31 Damper spring, 32 Damper line.

Claims (4)

When the color selection electrode assembly is configured with a large number of grid elements arranged at predetermined intervals in the area between the tape parts of a predetermined width provided at both ends in the horizontal direction, the surface is horizontal. In the aperture grill where the damper wire is stretched so as to cross in the direction,
The tape portion is provided with a thin plate portion that is thinner than the grid element body,
The thin plate portion includes an end portion on the grid element side of the tape portion in a region where the damper wire is to be stretched, and is formed so as to form a recess with respect to the surface of the aperture grill. . The surface of the thin plate portion is
2. The aperture grill according to claim 1, wherein the aperture grill is formed parallel to the surface of the aperture grille or inclined toward the grid element body. The surface of the thin plate portion is
The aperture grill according to claim 1, wherein the aperture grill is a flat surface or a convex curved surface. Aperture grill according to any one of claims 1 to 3,
A frame that supports the aperture grille by fixing the back surfaces of both edges in the vertical direction of the aperture grille;
A damper spring provided on the frame and a damper wire having both ends fixed to the damper spring, and a damper mechanism that suppresses vibration of the grid element body by stretching the damper wire on the surface of the aperture grill; With
The color selection electrode assembly, wherein the damper wire is stretched so as to pass through the thin plate portion of the tape portion.

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