JPH09283041A - Mounting structure for internal magnetic shield of cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity for welding, in a relatively large sized cathode ray tube(CRT) with even a retainer required in a major side of an internal magnetic shield(IMS), in the case of mounting the IMS in a color selecting mechanism unit. SOLUTION: In order to support a color selecting mechanism unit 32 to a panel inside of a CRT, through an elastic support member 46 fixed to a major side constitutional member 38 constituting a frame 30 of this color selecting mechanism unit 32, an IMS50 is locked to the color selecting mechanism unit 32 by a clip 60. Concretely, in a side of the elastic support member 46 and the IMS50, through holes 46b, 54b are provided, through these holes, a clip lock is provided. Thus by eliminating necessity for welding, a process is simplified, decreasing of pressure resistance due to flush dust at welding time can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment structure for attaching an internal magnetic shield to a color selection mechanism constructed by incorporating a color selection mask in a frame when assembling a cathode ray tube (CRT) of a color television or the like.

[0002]

2. Description of the Related Art A cathode ray tube (CRT) for a color television or the like.
In the assembly of, normally, an internal magnetic shield is attached to a color selection mechanism in which a color selection mask is assembled in a frame, and this is attached to the inside of the panel, and then the panel and the funnel are joined via frit glass or the like. (Anodic bonding).

Conventionally, there are two methods for attaching the internal magnetic shield to the color selecting mechanism according to the effective screen size. FIG. 7 shows a mounting method which is often adopted in a relatively small CRT having an effective screen size of 14 inches or 15 inches. In the color selection mechanism body 2 holding the color selection mask 1, a mounting member 6 is fixed to a short side constituent member 4 which constitutes a frame 5 thereof. Square holes 6 are provided on the mounting bracket 6 side and the internal magnetic shield 7 side, respectively.
a and 7a are provided, and the internal magnetic shield 7 is clipped through the square holes 6a and 7a.

On the other hand, in a relatively large CRT having a size larger than 15 inches, the mounting method shown in FIG. 8 is often used. Since the inner magnetic shield 7 cannot be sufficiently pressed only by clipping the short-side component 4 described above, in this method, the inner magnetic shield 7 is provided on the outer surface of the long-side component 3 that constitutes the frame 5. Welding (Welding location:
It will be fixed by 7b).

[0005]

However, in the conventional method of attaching the internal magnetic shield shown in FIG. 8, the clip attaching process and the welding are combined to complicate the attaching process, and splash dust is generated during the welding. And cathode ray tube (CRT)
However, there is a problem that the withstand voltage of is lowered.

The present invention has been made in view of such circumstances, and even in a relatively large-sized cathode ray tube that also needs to hold down the long-side component, the color selection mechanism of the internal magnetic shield that does not require welding. The purpose is to provide a new mounting structure for the.

[0007]

In order to solve the above-mentioned problems of the prior art and to achieve the above-mentioned object, the mounting structure of the internal magnetic shield of the cathode ray tube of the present invention has a color structure, for example, through a through hole. It is intended to provide a concrete method of clipping the long side constituent member side that constitutes the frame of the selection mechanism body.

That is, according to the present invention, in order to support the color selection mechanism inside the panel of the cathode ray tube, an elastic support member fixed to the long side constituting member constituting the frame of the color selection mechanism, or It was decided to perform this clip stop through the holder.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Prior to explaining the mounting structure of the internal magnetic shield of a cathode ray tube (CRT) of the present invention, first, the overall structure of the CRT according to the present invention will be described.
This is illustrated in the drawings and briefly described.

FIG. 6 is a schematic sectional view of this CRT.
The CRT 10 of this illustrated example includes a panel 12 and a funnel 1.
4 and the neck tube 16 constitute a vacuum container, and the panel 12
The funnel 14 and the funnel 14 are joined (anode joined) by frit glass or the like. A tension band 18 for explosion protection is wound around the outer periphery of the panel 12. Mounting ears 20 are formed on the outer circumference of the tension band 18, and the CRT 10 is mounted inside the television as a display device via the mounting ears 20. The tension band 18 and the mounting ear portion 20 are made of a conductive material such as metal and are grounded via the ground wire 18a.

A functional film sheet 24 is attached to the surface of the panel 12 with an ultraviolet curable resin layer 22 or the like.
The functional film sheet 24 is formed by laminating a predetermined functional film in order to protect the surface as well as reduce external light reflection and prevent electrification. A conductive tape 25 for grounding the functional film sheet 24 is attached to the peripheral portion of the functional film sheet 24 to prevent static electricity.

On the inner surface of the panel 12, a phosphor screen 26 coated with phosphors for emitting blue, green and red light is formed, and a color selection mask 28 is arranged in the vicinity of this phosphor screen 26. Here, the color selection mask is generally called a shadow mask or aperture grill, and is a conductive plate-like one having a large number of hole-shaped or lattice-shaped slits, and has a function of performing color selection according to an incident angle. The color selection mask 28 of this illustrated example is held by a frame 30, and this frame 30
It is attached to the inner side wall of the panel 12 via. The color selection mask 28 and the frame 30 having such a configuration constitute the color selection mechanism 32 of the present invention. Color selection mechanism 32
Will be described later in detail.

On the other hand, the neck tube 16 houses an electron gun 34. An electron beam 34a from this electron gun 34
Passes through the color selection mask 28, is subjected to color selection, reaches the phosphor screen 26 inside the panel 12, and excites a predetermined phosphor to emit light. An internal magnetic shield 50 (IMS: Inner Magnetic Shield) is attached to the color selection mechanism 32 so as not to obstruct the passage of the electron beam 34a and to shield the influence of an external magnetic field such as geomagnetism. ing. The mounting of the IMS 50 will be described in detail in the next embodiment.

First Embodiment FIG. 1 is a mounting view of an IMS according to the first embodiment of the present invention. As shown in this figure and as described above, the color selection mechanism 32 is composed of the frame 30 and the color selection mask 28 held on the lower surface of the frame 30 (the surface on the panel 12 side in FIG. 6). I am doing it.

The frame 30 is composed of two long side constituting members 38 forming long sides and two short side constituting members 40 forming short sides. Each long side constituent member 38 in this illustrated example
Is made of a material having an L-shaped cross section that is curved in a convex shape in accordance with the surface of the panel 12 in FIG. In addition, each short-side constituent member 40 in the illustrated example is configured by an arch-shaped square member that protrudes from the end of each long-side constituent member 38 toward the opposite color selection mask 28 side (upper in the figure).

On each arch-shaped short side component member 40, a flat plate-like mounting member 42 having a through hole 42a for clipping is fixed. In this illustrated example, both ends of the mounting member 42 are formed wide, and square holes (through holes 42a) are formed at the inner protruding portions of the wide portion so as to penetrate the front and back surfaces of the mounting member 42.

On the other hand, near the centers of the outer surfaces of the short-side constituent member 40 and the long-side constituent member 38, one side is supported by a holder 43, and one side of the elastic supporting member 4 is shaped like a leaf spring.
5, 46 are provided. Each elastic support member 45, 46
The leaf spring projecting direction is aligned in one direction when viewed from the circumference of the frame 30, and near the projecting tips of the elastic supporting members 45 and 46, round holes 45a and 46a are formed through the front and back surfaces thereof.
Are respectively formed. The round holes 45a and 46a are provided in the panel 12 of the color selecting mechanism 32, as will be described later.
It is provided to hold it when it is assembled to. The protruding directions of the elastic support members 45 and 46 are aligned to one side in order to evenly distribute the force applied to the held color selection mask 28 in all directions in the assembled color selection mechanism 32.

FIG. 3 shows an example of an elastic support member that can be used in the present invention, in comparison with a conventional one. That is, FIG. 7A shows an elastic support member 45 having the same shape as the conventional elastic support member 9 shown in FIGS. 7 and 8, and FIG. 8B shows the first embodiment of the present invention. 1, the elastic support member 46 provided on the long-side component member 38 of the frame 30.
Are enlarged and shown respectively.

As can be seen from this figure, in the present invention, a clip-through hole 46b is also formed on the side of the elastic supporting member 46 having the above construction. That is, in this illustrated example, an L-shaped projecting piece 46c is formed from the upper end of the holding side of the elastic supporting member 46, and the projecting piece 46c is provided with a through hole 46b for clip fastening. is there. In the present embodiment, the elastic support member 4 provided on the short-side component member 40.
As the member 5, a member having the same shape as the conventional elastic supporting member 9 shown in FIG. 7 is used.

The internal magnetic shield (IMS) attached to the color selecting mechanism 32 having the above-described structure may have the structure shown in FIG. 1, for example. FIG.
The IMS 50 shown in (1) is manufactured by joining pieces 52, 54 formed by cutting and folding a single thin plate at a joint portion 53 by welding or caulking.

The lower edge of each piece 52, 54 is bent outwardly over its entire side (partially acceptable),
Outer folded portions 52a and 54a are formed. This outer folding section 52
The color selection mechanism 3 described above is provided for each of a and 54a.
Through holes 52b and 54b of the same shape are provided at positions corresponding to the through holes 42a and 46b on the second side.

Then, these through holes 42a, 46b, 5
The IMS 50 is attached to the color selection mechanism 32 by stopping with the clip 60 via 2b and 54b. The shape of the clip 60 is not limited to that shown in the figure, but in the present embodiment, it is formed by bending a single leaf spring. That is, the clip 60 is formed with the insertion portion into the central through hole and the blade-shaped grip portions on both sides thereof. When the knob is pinched by hand, the insertion part shrinks to a width that can be inserted into the through hole, and when released, it elastically restores and becomes larger than the width of the through hole, thus fixing the IMS 50 to the color selection mechanism 32. To be done.

In such a mounting structure of the present invention, the CRT
Even when the effective screen size of 10 is relatively large, the IMS 50 can be easily attached to the color selection mechanism 32 without using welding as in the conventional case. Finally, of the color selection mechanism 32 with the IMS 50 attached in this way,
A brief description of the mounting inside the CRT is given.

FIG. 2 is an assembly drawing of the CRT 10 shown in FIG. First, the panel 12 having the fluorescent surface 26 formed therein
Prepare On the inner wall surface of the panel 12, projections 12a are formed in advance on each surface. In this panel 12, the color selection mechanism 32 after the IMS 50 is attached,
The elastic support members 45, 46 are housed so that the round holes 45a, 46a of the elastic support members 45, 46 engage with the protrusions 12a of the panel 12. Then, the funnel 14 after fixing the neck tube 16 accommodating the electron gun 34 is prepared, and the abutting edges of the panel 12 are joined together via frit glass or the like to form a CRT.
Assemble 10. After that, the tension band 18
After the mounting of the CRT 10 and the attachment of the functional film sheet 24 and the conductive tape 25, the assembly of the CRT 10 is completed.

Second Embodiment In the first embodiment, the through hole 46b provided in the elastically deformable member 46 is used as the through hole on the long side of the frame 30. On the other hand, in the present embodiment, the holder 44 for fixing the elastically deformable member 45 to the long-side component 38 is provided with a similar through hole. Figure 4 used here
[Fig. 5] is a view showing how the IMS according to this embodiment is attached to the color selection mechanism, and Fig. 5 is a view showing a holder usable in this embodiment in comparison with a conventional holder. In addition, in the description here, the same configurations and mounting methods as those of the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5, the holder 44 in the present embodiment is formed by bending a plate material, and the upper portion thereof is bent into the panel inside in an L shape. This L
The letter-shaped protrusion 44a is provided with a through hole 44b having the same shape as the corresponding through hole 54b on the IMS side in FIG.

As shown in FIG. 4, the IMS 50 is attached to the color selecting mechanism 32 and the clip 6 through the through hole 44b provided in the holder 44 having such a structure as in the first embodiment.
It can be easily installed with 0. Note that there is no particular limitation on matters other than those specifically mentioned in the above description.

For example, a through hole is provided only on one side of the IMS 50 side and the color selection mechanism 32 side, and a convex portion engageable with this through hole is provided on the other side, and the clip is used to prevent the convex portion from coming off. You may use. Instead of providing the through hole, it is also possible to provide convex portions which can be engaged with each other on both sides and use a clip for preventing the detachment.

In addition to the long side of the frame 30,
A similar through hole (or the above-mentioned convex portion) may be provided in the elastic support member 45 or the holder 43 on the short side, that is, the short side constituent member 40 side, and the short side may be clipped through the through hole. Of course, the shape of the elastically deformable member, the holder, the clip, the structure of the frame and the IMS, etc. are not limited to those shown in the drawings, but may be variously modified within the scope of the present invention.

[0030]

As described above, according to the mounting structure of the internal magnetic shield (IMS) of the cathode ray tube (CRT) according to the present invention, it is necessary to hold down the long side of the IMS with a large CRT or the like. Even in the case of doing so, it is possible to eliminate the conventional welding process.

For this reason, this mounting process can be simplified, and the pressure resistance of the CRT does not decrease due to splash dust during welding. On the other hand, it is not necessary to newly provide a metal fitting or the like to clip the IMS on the long side of the frame, and it is only necessary to previously provide a through hole or the like in the elastic support member or its holder. So I
The MS can be easily attached to the color selection mechanism.

For this reason, in the manufacture of CRTs, which are becoming larger and larger, the present invention will be applied to reduce the cost and improve the quality.
Expected to make a significant contribution.

[Brief description of drawings]

FIG. 1 is a cathode ray tube (CR) according to a first embodiment of the present invention.
It is a mounting view of the internal magnetic shield (IMS) of T) to the color selection mechanism.

FIG. 2 is an assembly diagram of a CRT showing the assembly of the color selection mechanism after the IMS is attached.

FIG. 3 shows an elastically deformable member (FIG. 3B) according to the first embodiment of the present invention, which is a conventional elastically deformable member (FIG. 3A).
It is a perspective view shown in comparison with.

FIG. 4 is a CRT IMS according to a second embodiment of the present invention.
FIG. 3 is a view showing the attachment of the above to a color selection mechanism.

FIG. 5 is a holder according to a second embodiment of the present invention (see FIG.
It is a perspective view which compares (b)) with the conventional holder (the same figure (a)).

FIG. 6 is a schematic sectional structural view of a CRT manufactured by using the present invention.

FIG. 7 is a diagram showing a conventional IMS attachment method to a color selection mechanism, which is often used in manufacturing a relatively small CRT.

FIG. 8 is a comparatively large CR among the conventional methods.
FIG. 8 is a diagram showing another attachment method often used in manufacturing T.

[Explanation of symbols]

10 ... CRT (cathode ray tube), 12 ... panel, 14 ... funnel, 16 ... neck tube, 18 ... tension band, 2
0 ... Mounting ears, 22 ... UV curable resin layer, 24 ... Functional film sheet, 25 ... Conductive tape, 26 ... Fluorescent surface, 28
... Color selection mask, 30 ... Frame, 32 ... Color selection mechanism, 34 ... Electron gun, 34a ... Electron beam, 38 ... Long side component, 40 ... Short side component, 42 ... Mounting bracket, 42a
... Through hole, 43 ... Holder of the same shape as the conventional one, 44 ... Holder,
44a ... projection piece, 44b ... through hole, 45 ... holder of the same shape as the conventional one, 45a ... round hole, 46 ... elastic support member, 46a ... round hole, 46b ... through hole, 46c ... projecting piece, 50 ... IMS (internal magnetic Shield), 52, 54 ... Piece, 52a, 54
a ... Outer bent portion, 52b, 54b ... Through hole, 53 ... Joined portion,
60 ... clip.

Claims (4)

[Claims] 1. A color selecting mechanism constructed by incorporating a color selecting mask in a frame, and fixed to the frame of the color selecting mechanism for supporting the color selecting mechanism inside the panel of the cathode ray tube. A plurality of elastic support members and an internal magnetic shield for reducing the influence of an external magnetic field on the inside of the cathode ray tube, the internal magnetic shield being provided at least on the long side of the frame via the elastic support member. Attachment structure of the internal magnetic shield of the cathode ray tube, which is clipped to the color selection mechanism. 2. A color selection mechanism constructed by incorporating a color selection mask in a frame, and a holder for each of the frame of the color selection mechanism for supporting the color selection mechanism inside the panel of the cathode ray tube. A plurality of elastic supporting members fixed via the inner magnetic shield and an inner magnetic shield for reducing the influence of an external magnetic field on the inside of the cathode ray tube, the inner magnetic shield being at least on the long side of the frame. Attachment structure of the internal magnetic shield of the cathode ray tube, which is clipped to the color selection mechanism through the holder. 3. The internal magnetic shield and the elastic support member are respectively provided with through holes, and the internal magnetic shield is clipped to the color selection mechanism through the through holes. 1. A structure for mounting the internal magnetic shield of the cathode ray tube according to 1. 4. The through hole is provided in each of the internal magnetic shield and the holder, and the internal magnetic shield is clipped to the color selection mechanism through the through holes. Attachment structure for the internal magnetic shield of the described cathode ray tube.