JPH06153213A - Degaussing coil for cathode ray tube - Google Patents

Abstract

PURPOSE:To obtain the degaussing coil by which a coil bundle does not get out of shape and with excellent adhesion to the cathode ray tube. CONSTITUTION:An inner side rib 2 and outer side ribs 3,3 are provided in a shape hold member 1 shaped to be attached to an outer circumferential wall of a cathode ray tube B. A coil bundle 11 is set along with the inner side rib 2 and the outer side ribs 3,3 and an insulation coating member 12 is applied to the outer circumference. Thus, the cabinet is made close to the cathode ray tube. Then a strong degaussing effect is obtained over a wide range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degaussing coil for a cathode ray tube, and more particularly to a degaussing coil mounted on the outer peripheral wall of the cathode ray tube of a display device.

[0002]

2. Description of the Related Art A shadow mask, an aperture grill and the like are arranged in a color cathode ray tube. These shadow masks, aperture grills, etc. are made of thin steel plates and are easily magnetized by an external magnetic field such as geomagnetism. When the shadow mask, aperture grille, etc. are magnetized, color misregistration and color unevenness occur on the screen, resulting in deterioration of image quality. Therefore, a degaussing coil is used to prevent the magnetization of the shadow mask, the aperture grill, and the like.

FIG. 9 is an explanatory view showing an example of a conventional degaussing coil. This degaussing coil 900 uses, for example, a magnet wire having a wire diameter of 0.8 mm as a wire rod, and the coil wire 9 having a circular cross section is wound by winding a required number of the wire in a loop shape.
1 is formed. The PVC is attached to the outer circumference of the coil bundle 91.
An insulating coating material 92 such as an adhesive insulating tape is wrapped in a spiral shape. The degaussing coil 900 is attached to the outer peripheral wall BT of the cathode ray tube B as shown in FIG.

[0004]

In recent years, it has been demanded that the cabinet of an image display device such as a TV receiver be as close to the cathode ray tube as possible in view of compactness and design. However, since the degaussing coil is mounted on the outer peripheral wall BT of the cathode ray tube B, it is necessary to make the degaussing coil as thin as possible in order to bring the cabinet close to the cathode ray tube. However, since the conventional degaussing coil 900 has a circular cross section, the degaussing coil 900 does not become thin, and as shown in FIG. 11, the outermost peripheral portion 900a of the degaussing coil 900 is relatively separated from the outer peripheral wall BT. Therefore, there is a problem that it is difficult to bring the cabinet close to the cathode ray tube B. Further, there is a problem that the degaussing effect due to the outermost circumference 900a of the degaussing coil 900 is reduced. Although it is conceivable to make the degaussing coil flat (for example, elliptical in cross section) by the conventional method, in this case, the shape of the degaussing coil is likely to be lost, which is not practical.

On the other hand, a stronger degaussing effect over a wide range is required due to the increase in screen size and accuracy of the image display device. In order to deal with this, it is necessary to complicate the shape of the degaussing coil, increase the number of windings, and increase the wire diameter. However, if the shape of the degaussing coil is complicated,
There was a problem that the shape of the degaussing coil increased when it was mounted along the outer peripheral wall of the cathode ray tube. Further, as the number of windings is increased or the wire diameter is increased, the flexibility of the degaussing coil decreases, so that as shown in FIG. There is a problem that it becomes an obstacle to be close to B and the demagnetization effect becomes small.

Therefore, an object of the present invention is to provide a degaussing coil for a cathode ray tube which does not lose its shape even if it has a flat shape or a complicated shape and which can be easily attached to the outer peripheral wall of the cathode ray tube. Especially.

[0007]

A degaussing coil for a cathode ray tube according to the present invention is a shape-retaining member having a shape adapted to the outer peripheral wall shape of the cathode-ray tube and a rib for retaining a predetermined coil shape, and a shape-retaining member for the shape-retaining member. A structural feature is that it is provided with a coil bundle along the ribs and an insulating coating material that integrally coats the coil bundle and the shape maintaining member.

[0008]

In the degaussing coil for a cathode ray tube according to the present invention, since the coil bundle is integrally coated with the insulating coating material along the rib of the shape maintaining member, the coil bundle has a desired shape (for example, a flat shape or a flat shape). It is fixed in a complicated shape and does not lose its shape. Further, since the shape-retaining member has a shape adapted to the shape of the outer peripheral wall of the cathode ray tube, it can be attached easily to the outer peripheral wall of the cathode ray tube. Therefore, the cabinet can be brought close to the cathode ray tube B. In addition, a high degaussing effect can be obtained.

[0009]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this.

FIG. 1 is a partially cutaway perspective view of a degaussing coil 100 of a cathode ray tube according to an embodiment of the present invention. 1 is
It is a resin shape maintaining member. 2 is an inner rib.
3 is an outer rib. 11 is a coil bundle. 12
Is an insulating coating material such as PVC adhesive insulating tape.

As shown in FIGS. 2 and 3, the inner ribs 2 and the outer ribs 3, 3 are provided alternately in the longitudinal direction of the shape retaining member 1. These have the function of increasing the strength of the shape maintaining member 1 in addition to the function of maintaining the shape of the coil bundle 11. The bottom face between the outer ribs 3, 3 is provided with a hollow portion 4 from the viewpoint of weight saving and material saving.

Both ends of the shape-retaining member 1 are bent in an arc shape along the outer peripheral wall BT of the cathode ray tube B. In addition, the bottom surface of the shape-retaining member 1 is flat so that it can be brought into close contact with the outer peripheral wall BT. The thickness H of the shape retaining member 1 is 1 mm
It is a degree.

As shown in FIG. 3, the insulating coating material 12 is provided on the portion of the coil bundle 11 other than the portion along the shape retaining member 1.
Wrap it in a spiral shape. Next, the portion of the coil bundle 11 along the shape-retaining member 1 is along the inner ribs 2 and the outer ribs 3 and 3 of the shape-retaining member 1. Next, as shown in FIG. 4, the shape maintaining member 1 and the coil bundle 11 are integrated, and the insulating coating material 12 is spirally wrapped. This ensures insulation. 5 (a),
4 (b), (c), (d), and (e), AA 'cross section of FIG. 4, B-
The B'section, CC 'section, DD' section, and EE 'section are shown. Thus, the degaussing coil 100 of the cathode ray tube is completed.

The degaussing coil 100 of this cathode ray tube is shown in FIG.
As shown in FIG. 3, the cathode ray tube B is mounted on the outer peripheral wall BT.
Since the bottom shape of the shape-retaining member 1 is flat and both ends are arcuate, as shown in FIG.
00 can be mounted in close contact with the outer peripheral wall BT of the cathode ray tube B. Further, as shown in FIG. 8, the coil bundle 11 does not lose its shape and adheres to the outer peripheral wall BT of the cathode ray tube B in a predetermined shape.

[0015]

According to the present invention, the degaussing coil can be closely attached to the outer peripheral wall of the cathode ray tube while maintaining the flat coil shape and the complicated coil shape. As a result, the degree of adhesion with the cathode ray tube is increased, and a strong degaussing effect can be obtained over a wide range. Further, the cabinet can be brought close to the cathode ray tube, and the TV set or the like can be made compact. Furthermore, the degaussing coil can be easily attached to the cathode ray tube and the degaussing coil can be attached automatically.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a degaussing coil according to an embodiment of the present invention.

2 is an end perspective view of a shape holding member used for the degaussing coil of FIG. 1. FIG.

FIG. 3 is an explanatory view showing an assembling method of the degaussing coil of FIG. 1.

FIG. 4 is a perspective view of the degaussing coil of FIG. 1.

5 is a sectional view of each part of the degaussing coil shown in FIG. 1. FIG.

FIG. 6 is a perspective view showing a mounting state of the degaussing coil and the cathode ray tube of FIG.

FIG. 7 is a rear view showing a mounting state of the degaussing coil and the cathode ray tube of FIG.

FIG. 8 is a cross-sectional view of essential parts in a state where the degaussing coil and the cathode ray tube of FIG. 1 are attached.

FIG. 9 is a perspective view showing an example of a conventional degaussing coil.

10 is a perspective view showing a mounting state of the degaussing coil and the cathode ray tube of FIG. 9. FIG.

FIG. 11 is a cross-sectional view of essential parts in a state where the degaussing coil and the cathode ray tube in FIG. 9 are attached.

FIG. 12 is a rear view showing a mounting state of the degaussing coil and the cathode ray tube of FIG.

[Explanation of symbols]

 100 degaussing coil 1 shape retention member 2 inner rib 3 outer rib 4 hollow part 11 coil bundle 12 insulating coating material B cathode ray tube BT outer peripheral wall

Claims (1)

[Claims] 1. A shape-retaining member having a rib for holding a shape conforming to the shape of the outer peripheral wall of a cathode ray tube and a predetermined coil shape, and a coil bundle along the rib of the shape-retaining member.
A degaussing coil for a cathode ray tube comprising the coil bundle and an insulating coating material that integrally covers the shape retaining member.