JPH07296739A - Aperture grill for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To provide an aperture grill superior in vibration damping. CONSTITUTION:An aperture grill is provided with an aperture grill frame composed of a pair of vertical frame members (B members) which are vertically aligned and a pair of lateral frame members (A members) 21 which are laterally aligned and joined with B members, and an aperture grill linear streak body 18 crossing over between A members 21. The linear streak body 18 is composed of a plurality of linear streaks 18c formed by slits 18b, a tie projection 30 for outside vibration buffer is provided on the end face of A members welded to the linear streak body, and the linear body 18 is welded to A members 21 in such a state that respective end faces 18d of the slits 18b, namely, a plurality of the linear streaks 18c are contacted with the tie projection 30. Because the linear streaks 18c are in contact with the tie projection 30, when A members 21 are oscillated, the oscillation is not transmitted to the respective linear streaks 18c so as to improve vibration damping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aperture grill as a color selection mechanism used in a color cathode ray tube, and more particularly to an aperture grill for a color cathode ray tube having an enhanced vibration damping effect.

[0002]

2. Description of the Related Art A color cathode ray tube having an aperture grill (AG) as a color selection mechanism is constructed as shown in FIG. Since this figure is a well-known configuration, the outline of the configuration will be described. An electron gun 1 in this example is housed on the neck side of the cathode ray tube (CRT) 10 and an aperture grill provided on the panel 5 side. The electron beam 2 impinges on the phosphor screen (phosphor) 3 formed on the inner surface of the panel through 4, so that the phosphor screen 3 emits light of a predetermined color. The aperture grill 4 is for controlling the electron beam 2 to reach a predetermined position.

An example of the aperture grill 4 configured as shown in FIG. 8 is shown. In the figure, the longitudinal direction is the horizontal scanning direction, and has a pair of left and right vertical frame members (referred to as B members) 19 as steel frames. The B member 19 is used by deforming a steel material for a steel frame as shown in the figure, and between the corresponding free ends of the pair of B members 19, a pair of horizontal frame members (as a steel frame) is used. Used, called A member) 2
1 is passed over and welded in the state shown in the figure.

The frame (skeleton) of the aperture grill 4 is constituted by these four members 19 and 21. The A member 21 is a steel material having an L-shaped cross section as shown in the drawing, and a linear body having an interdigital shape as shown in the figure between the pair of A members 21 (aperture grill body, which is an AG tape). ) 18 is placed and A in that state
Welded to member 21. The filament 18 is stretched with a predetermined tension.

As is well known, the linear member 18 is formed by etching a thin soft steel plate to form slits having a predetermined pitch and width. In the figure, a pair of damper wires 17a and 17b are further stretched in the horizontal scanning direction. A damper spring 20 is provided to stretch the damper wires 17a and 17b.

[0006]

The filament body 18 is formed by etching a thin soft steel plate to form predetermined slits 18b and filaments 18c (see FIG. 9) called a grill. In consideration of welding with the A member 21, plate-like welding plate portions (to be weld margins) 18a as shown in FIG. 9 are left on the upper and lower end portions of the thin mild steel plate. The substantially central portion 23 of the welding plate portion 18a is the A member 2
It is a welding point with 1 (shown by a two-dot chain line).

The width W1 of the welding plate portion 18a is selected so that the end surface 18d of the slit 18b is located further inside than the end surface 24 of the vertical piece 21A that constitutes the A member 21, in other words, so that it does. .

By the way, in the speaker-integrated monitor or high-resolution monitor using the color cathode ray tube 10 described above, vibrations and internal vibrations from the monitor cabinet are easily transmitted to the color cathode ray tube 10.

When such vibrations are transmitted to the color cathode ray tube 10, the vibrations are also transmitted to the aperture grill 4 provided inside thereof. When the vibration is transmitted to the aperture grill 4, the vibration is also transmitted to the linear body 18 via the A and B members 19 and 21.
Since the linear member 18 is stretched around the A member 21 with a certain amount of tension, it is not affected by some external vibration (external vibration), but when the external vibration increases, the A member 21 may be vibrated and deformed. .

When the A member 21 is subjected to vibrational deformation, the welding plate portion 18a is also distorted, so that the vibrational deformation is transmitted to the wire strip 18c as a grill while being amplified by the welding plate portion 18a.

FIG. 10 is a characteristic diagram for explaining the vibration phenomenon at the time of vibration, in which the vibration amplitude particularly in the horizontal scanning direction (x direction) is recorded. FIG. 11 also shows the state of vibration in the tube axis direction (z direction).

The width of the welding plate portion 18a to be the welding margin is W
1, in particular, when the width from the welded portion 23 of the A member 21 to the end surface 18d of the slit 18b is W2,
Strictly speaking, the vibration amplitude (displacement amount) of the filament 18c differs depending on the width W1 and the length W2. 10 and 11 show the case where the aperture grill 4 having a horizontal width (horizontal width) of 400 mm is used, and the A member 21 is set in the vertical direction (vertical scanning direction).
It is an experimental example when it is transformed into.

When such a deformation is applied to the A member 21, a strain is applied to the welding plate portion 18a such that a node at a center of 200 mm in the lateral width direction becomes a node. Therefore, it is deformed in the lateral width direction as shown by the curves L1 and L2 in FIG. 10 and 11, the curve L1 shows the vibration amplitude when the width W2 is 10 mm, and the curve L2
Indicates the vibration amplitude when it is 5 mm. In the vertical direction, the left and right ends of the aperture grille 4 are deformed into nodes, and the center of the aperture grille 4 is deformed into peaks at 200 mm, resulting in the results shown by the curves L1 and L2 in FIG.

As described above, it is understood that the external vibration transmitted to the A and B members 19, 21 due to the presence of the welding plate portion 18a is transmitted to the filament 18c while being amplified. Line 1
When 8c vibrates in the x and z directions, the image is disturbed as is well known.

Therefore, the present invention solves the above-mentioned conventional problems, and proposes an aperture grill for a color cathode ray tube having an improved vibration damping effect.

[0016]

In order to solve the above-mentioned problems, in the invention according to claim 1, a pair of vertical frame members arranged in the vertical direction and a vertical frame member arranged in the horizontal direction are provided. It has an aperture grille frame composed of a pair of connected horizontal frame members, and an aperture grille linear body inserted between the horizontal frame members, and the linear body is formed by a slit. In addition to being composed of a large number of filaments, external vibration damping belt-like projections are provided on the filament body welding end surface of the lateral frame member, and the end surfaces of the slits are set to the belt-like projections. The filament is welded to the weld end surface of the filament.

[0017]

As shown in FIG. 3, since the welding end face 21B of the vertical piece 21A of the A member 21 constituting the aperture grill frame has the strip-shaped projection 30 formed on the inner side thereof, the aperture grille linear body is formed. When welding 18, the lower surface of the linear body 18 is the top 30a of the strip-shaped projection 30.
Are welded in contact with.

At this time, as shown in FIG.
The welding plate portion 18a is welded to the welding end surface 21B with the end surface 18d of b extending over the top portion 30a. Therefore, a plurality of filaments 18c formed by the slits 18b
All of the end portions of are in contact with the top portion 30a.

When welding is carried out in this manner, since the linear member 18 is welded to the A member 21 in a state where the welding margin is zero (in other words, W2 = 0), it is for welding when vibrating. Since the amplifying action of the plate portion 18a is almost eliminated, the external vibration transmission to the filament 18c is reduced. For this reason,
The vibration characteristics are as shown by the curve L3 in FIGS. 10 and 11, and the aperture grill 4 having a high vibration damping effect can be configured.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a case in which an example of an aperture grill for a color cathode ray tube according to the present invention is applied to a structure as shown in FIG. 8 will be described in detail with reference to the drawings.

Also in the present invention, as shown in FIG. 1, a pair of B members 19 which are vertical frame members as the aperture grille 4 for a color cathode ray tube, and a pair of these B members 19.
As in the conventional case, the aperture grille frame is composed of the pair of A members 21, which are connected to the member 19 and serve as horizontal frame members.

Of the A and B members 19 and 21, between the A member 21, a comb-shaped linear member 18 (see FIG. 2) is attached and fixed in a stretched state. The fixing is by welding.

As shown in FIG. 3, the A member 21 constituting the horizontal frame member is L-shaped, and as shown in FIG. 3, the free end of the vertical piece 21A, that is, the welding end face 21B, has a strip-shaped projection 30 as shown in the drawing. Is formed. The band-shaped protrusion 30 is formed over the entire length of the A member 21 as shown in FIGS. 1 and 4. Since the height La of the A member 21 must comply with the prescribed height, the strip-shaped projection 3
The protrusion length of 0 is (La-Lb; Lb is the height to the welding end surface 21B).

When the width of the end face of the vertical piece 21A is about 5 to 8 mm, the height of the strip-shaped projection 30 is 0.5 to 3.0 m.
The m position and the width can be selected to be 1 to 2 mm.

The filament 18 is attached to the end face 2 for welding the vertical piece 21A.
When welding to 1B, as shown in FIG. 4, the welding plate portion 18a is welded to the welding end surface 21B with the end surface 18d of the slit 18b straddling the top portion 30a. Therefore, the plurality of filaments 18 formed by the slits 18b
All of the end portions of c are in contact with the top portion 30a and a part of the peripheral surface of the top portion 30a on the welded portion 23 side.

All of the ends of the plurality of filaments 18c are the apex 30.
When welding is performed so as to be in contact with a, the linear body 18 is A when the welding margin is zero (in other words, W2 = 0).
It is the same as being welded to the member 21. That is, it is equivalent to that all of the plurality of filaments 18c are directly welded to the welding end surface 21B.

Then, in the case of FIG. 4, since the distortion of the welding plate portion 18a when vibrated as described in the conventional example is greatly reduced, the amplifying action of the welding plate portion 18a is almost eliminated. Therefore, even if the A member 21 is vibrated, the vibration is hardly transmitted to the plurality of filaments 18c. Therefore, when the aperture grill 4 is constructed by welding so as to have the relationship shown in FIG.
The vibration characteristic of 8c becomes a characteristic curve as shown by the curve L3 in FIGS. 10 and 11, and the vibration amounts in the x and z directions can be significantly suppressed. Therefore, the aperture grill 4 having a high vibration damping effect can be realized with a simple structure.

Each of the strip-shaped projections 30 shown in FIGS. 3 and 4 has a shape in which the tip portion (top portion) 30a is rounded.
As shown in FIG. 5, a strip-shaped protrusion 30 having a short height or a semi-cylindrical shape is used, or as shown in FIG. 6, the semi-cylindrical shape is used as a basic shape. Alternatively, the strip-shaped projections 30 may be formed so that the lower surface of the linear member 18 including the welding plate portion 18a comes into complete contact with the surface 30b after welding.

The point is that any shape may be used as long as it does not break and can absorb vibration.

[0030]

As described above, the aperture grill according to the present invention forms a strip-shaped projection extending in the horizontal scanning direction with respect to an A member which is a horizontal frame member, and a plurality of linear stripes (grills) are formed on the strip-shaped projection. In the state of being in contact, the avalanche-shaped filaments are fixed by welding.

According to this, it is equivalent to that a plurality of filaments are welded to the A member, and the width of the welding plate portion, which is a portion of the filament body, for the welding margin can be made almost zero. The welding plate portion exhibits a vibration amplifying action when the A member or the like is excited, but according to the present invention, since the width of the welding plate portion can be made almost zero, this amplifying action can be suppressed as much as possible. As a result, it has the practical benefit of being able to provide an aperture grill with high vibration damping effect.

Therefore, the present invention is extremely suitable for application to a color cathode ray tube having a high probability of vibrating the aperture grill such as a monitor with a built-in speaker and a monitor for high resolution.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an example of an aperture grill for a color cathode ray tube according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged side view of FIG.

FIG. 4 is a perspective view of FIG.

FIG. 5 is a perspective view of a part of an A member showing another example of the band-shaped projection.

FIG. 6 is a perspective view of a part of an A member showing another example of the band-shaped projection.

FIG. 7 is a partially cut perspective view showing an example of a color cathode ray tube using an aperture grill.

FIG. 8 is a perspective view showing an example of a conventional aperture grill.

9 is a partially enlarged perspective view of FIG.

FIG. 10 is a characteristic diagram showing a linear displacement during vibration.

FIG. 11 is a characteristic diagram similarly showing the linear displacement during vibration.

[Explanation of symbols]

 4 Aperture grill 18 Wire body 18a Welding plate portion 18b Slit 18c Wire (grill) 18d Slit end face 19 B member 21 A member 21A Vertical piece 21B Welding end face 30 Band-like protrusion

Claims (2)

[Claims] 1. A frame for an aperture grill, comprising a pair of vertical frame members arranged in a vertical direction and a pair of horizontal frame members arranged in a horizontal direction and connected to the vertical frame member, and the horizontal frame. And a filament body for aperture grilles that is passed between the frame members, the filament body being composed of a number of filaments formed by slits, and the filament body welding end surface of the transverse frame member. A band-shaped projection for external vibration damping is provided on the collar, and the linear body is welded to the welded end surface of the linear body with each end surface of the slit being in contact with the band-shaped projection. Aperture grill for cathode ray tube. 2. The aperture grill for a color cathode ray tube according to claim 1, wherein the strip-shaped projection is provided inside a weld end surface of the filament body.