JP2000125318A - Structure for fitting demagnetization coil to cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the fitting work of a demagnetization coil and to improve its workability by forming plural projection parts for holding the demagnetization coil on a glass part on the rear side of a cathode-ray tube(CRT). SOLUTION: In the fitting structure of a demagnetization coil 2 to a CRT, four projection parts 5 each of which consists of a pair of approximately elliptical projections 3, 4 for holding the coil 2 between them are formed on four positions of the glass part on the rear side of the CRT 1. The coil 2 is wound around four positions so as to be held between the projections 3, 4 of respective pairs. Since the structure winds the coil 2 around four positions of the glass part so as to be pinched between the projections 3, 4 of respective pairs formed on the four positions, the workability of fitting work of the coil 2 can be improved and the fit state of the coil 2 can be stabilized in addition to advantages such as cost down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a degaussing coil on a CRT in which the degaussing coil is mounted on the back side of the CRT.

[0002]

2. Description of the Related Art Hitherto, a structure for mounting a degaussing coil on a cathode ray tube of this type has been such that, for example, the degaussing coil is mounted on an ear (lug plate) of the cathode ray tube. However, there is a problem that it is difficult to attach the degaussing coil to the ear (lag plate) of the cathode ray tube, and there is a problem that workability is poor, and there is a possibility that the degaussing coil may be damaged.
Attachment of the degaussing coil to the cathode ray tube using a holder or the like has also been performed. However, in this case, the number of parts is large because of the use of the attachment member such as the holder, which causes a problem of high cost. was there.

A cathode ray tube having a structure for mounting a degaussing coil to a conventional cathode ray tube is disclosed in Japanese Patent Application Laid-Open No. 63-221.
No. 790 is described. In this case, as shown in FIG. 2, a degaussing coil 104 is wound around a rear extension 103 of upper and lower portions of an explosion-proof band 102 wound around a tube (CRT) 101. However, the conventional cathode ray tube has a problem that it is difficult to form the explosion-proof band 102 because the rear extension 103 must be provided on the explosion-proof band 102. Further, a degaussing coil 104 must be inserted into the gap between the rear extension 103 of the explosion-proof band 102 and the tube (CRT) 101, and this degaussing coil 104 must be wound around the rear extension 103 of the explosion-proof band 102. Therefore, there was a problem that this work was difficult.

As a conventional degaussing coil mounting device,
There is one disclosed in Japanese Utility Model Laid-Open No. 60-59684. As shown in FIG. 3, the holding portions 201b, 201b holding the degaussing coil A, and the holding portions 201b,
The insertion portion (not shown) of the first fixture 201 having the bending portions 201e and 201f for bringing the 201b into contact with the outer peripheral surface of the cathode ray tube D is attached to the attachment lug plate 202 of the cathode ray tube D.
A second mounting member 203 having a holding portion 203c for holding the degaussing coil A is fitted into the mounting member 204 of the cathode ray tube D, and the holding portion of the first mounting member 201 is inserted. The degaussing coil A is held by the holding portions 203c of the second mounting member 203 and 201b, 201b.

[0005] In this case, there is a problem that the number of parts is large and the cost is high because the first mounting tool 201 and the second mounting tool 203 are required. In addition, there is a problem that the work of attaching the degaussing coil A is difficult.

Another conventional cathode ray tube is disclosed in Japanese Patent Application Laid-Open No. 5-41176. As shown in FIG. 4, a magnetic shield is provided inside a tube (cathode tube) 301, and a part of a degaussing coil 303 is placed on an explosion-proof member 302 provided on a side wall of the tube 301. A portion 303 mounted on the explosion-proof member 302 is formed in a flat portion 304.

In this case, the portion of the degaussing coil 303 to be placed on the explosion-proof member 302 needs to be formed in the flat portion 304, which causes a problem that the number of steps is increased and the cost is increased. Further, since most of the degaussing coil 303 is located along the outer surface of the tube 301, this portion is not fixed, so that there is a problem that the mounting state of the degaussing coil 303 is unstable.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and the work for mounting the degaussing coil is simple, the workability can be improved, and no mounting member such as a holder is required. It is an object of the present invention to provide a structure for mounting a degaussing coil on a cathode ray tube, which can reduce the number of parts and cost, and stabilize the mounting state of the degaussing coil.

[0009]

In order to achieve the above object, the invention according to claim 1 is characterized in that a projection for holding a degaussing coil is provided on a glass portion on the back side of a cathode ray tube. And The invention according to claim 2 is characterized in that the projections project outward on a glass portion on the back surface side of the cathode ray tube, and are formed by a pair of projections that sandwich the degaussing coil. The invention according to claim 3 is characterized in that the protrusions are provided at four locations on the glass portion on the back surface side of the cathode ray tube.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a structure for mounting a degaussing coil to a CRT according to the present invention will be described below with reference to the drawings. FIG. 1A is a schematic rear view showing a rear surface side of a cathode ray tube in a structure for mounting a degaussing coil to a cathode ray tube according to an embodiment of the present invention, and FIG. 1B is a portion showing a projection for holding a degaussing coil on the rear surface side of the cathode ray tube. It is a perspective view.

As shown in FIGS. 1 (a) and 1 (b), the mounting structure of the degaussing coil to the CRT according to the present embodiment holds the degaussing coil 2 in four places on the glass part on the back side of the CRT 1. For this purpose, a projection 5 composed of a pair of substantially elliptical projections 3 and 4 is provided. The degaussing coil 2 is wound so as to be sandwiched between the pair of protrusions 3 and 4 at these four locations.

According to the mounting structure of the degaussing coil to the cathode ray tube of the present embodiment, the degaussing coil 2 is wound around a pair of protrusions 3 and 4 provided at four locations on the glass portion on the back side of the cathode ray tube 1. Therefore, the work of attaching the degaussing coil 2 is simple, and the workability can be improved. Furthermore, no mounting member such as a holder is required, so that the number of parts can be reduced and cost can be reduced. Moreover, since the degaussing coil 2 is wound and mounted between the pair of protrusions 3 and 4 at four places on the glass portion on the back side of the cathode ray tube 1, the mounting state of the degaussing coil 2 can be stabilized.

In this embodiment, the pair of projections 3, 4 are provided at four places in the glass portion on the back surface side of the cathode ray tube 1. However, the present invention is not limited to this. 1 may be provided at three places in the glass part on the back side, and furthermore, a pair of projections 3 and 4 may be provided at a plurality of places in the glass part on the back side of the cathode ray tube 1. In the present embodiment, a pair of protrusions 3
4 has been described as having a substantially elliptical shape. However, the present invention is not limited to this, and may have a substantially circular shape, a substantially rectangular shape, a substantially square shape, or the like. The degaussing coil 2 is not limited to
A plurality of projections each having a hook portion for hooking when wound around the glass portion on the back surface side may be provided.

[0014]

As described above, according to the first aspect of the present invention, the demagnetizing coil is held by the projection provided on the glass portion on the back side between the browns. Work is simple, and workability can be improved. Furthermore, no mounting member such as a holder is required, so that the number of parts can be reduced and cost can be reduced.
According to the second aspect of the present invention, the degaussing coil is held in a stable state because the degaussing coil is sandwiched and held by the pair of projections provided on the glass portion on the back side between the browns. And the degaussing coil does not accidentally come off the protrusion.

According to the third aspect of the present invention, since the projections are provided at four locations on the glass portion on the back side between the browns, the degaussing coils are wound around these four projections and held. As a result, the mounting state of the degaussing coil is stabilized. Further, since the degaussing coil can be mounted simply by winding the degaussing coil around these four projections, the work of mounting the degaussing coil can be simplified.

[Brief description of the drawings]

FIG. 1A is a schematic rear view showing a rear surface side of a cathode ray tube in a structure for mounting a degaussing coil to a cathode ray tube according to an embodiment of the present invention, and FIG. 1B shows a projection for holding a degaussing coil on the rear surface side of the cathode ray tube. It is a partial perspective view shown.

FIG. 2 is a perspective view showing a first example of a conventional structure for attaching a degaussing coil to a cathode ray tube.

FIG. 3 is a perspective view showing a second example of a conventional structure for attaching a degaussing coil to a cathode ray tube.

FIG. 4 is a perspective view showing a third example of a conventional structure for attaching a degaussing coil to a cathode ray tube.

[Explanation of symbols]

 1 CRT 2 Demagnetizing coil 3, 4 Projection 5 Projection

Claims (3)

[Claims] 1. A structure for mounting a degaussing coil on a CRT, wherein a projection for holding the degaussing coil is provided on a glass portion on the back side of the CRT. 2. The cathode ray tube according to claim 1, wherein the projection portion projects outward from a glass portion on the back surface side of the cathode ray tube, and is formed by a pair of projections between which the degaussing coil is sandwiched. Mounting structure of degaussing coil. 3. The structure for mounting a degaussing coil on a CRT according to claim 1, wherein the projections are provided at four locations on a glass portion on the back side of the CRT.