JPS5850683Y2 - Degaussing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a degaussing device used for degaussing a cathode ray tube in a color television receiver, and an object of the present invention is to provide a device that can provide safety protection during heating and is easy to manufacture. This is the purpose.

The cathode ray tube of a color television receiver is equipped with a degaussing coil 1 as shown in Fig. 1 in order to demagnetize its shadow mask, etc., and when the power switch is turned on, attenuated alternating current is passed through this coil to cause the degaussing effect. I have to.

However, in this degaussing circuit, a self-heating type temperature-dependent resistance element is used to flow the attenuated alternating current.
If these break down, there is a risk that current will continue to flow through the degaussing coil, causing it to heat up.

Therefore, in order to ensure safety by cutting off the consumption coil when it heats up, a part of the winding 2 in the degaussing coil is cut off as shown in Figures 2 and 3, and the temperature fuse is 3 are being connected.

However, such a conventional device requires a process of winding the end of the winding 2 around the lead wire 4 of the temperature fuse 3 and soldering it with solder 5, making manufacturing cumbersome and expensive. There were drawbacks.

Further, when the temperature fuse 3 is provided in this manner, the part thereof is not connected to the automatic winding machine, which has the disadvantage that automation of the winding process is hindered.

Therefore, it is an object of the present invention to provide a degaussing device that eliminates such conventional drawbacks.Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

FIG. 4 shows the winding 7 used in the degaussing coil 6 of this device and its manufacturing process.

First, the winding 7 is constructed using a kind of conducting wire 8 having a fixed wire diameter, and as shown in A, a part of the conducting wire 8 that is to become the main body of the winding 7 is cut off.

It is advantageous for the cut end surface 9 to be tapered as shown in the drawing from the viewpoint of tensile strength characteristics.

Then, the cut end faces 9 are butted together as shown in B, and a low melting point metal 10 is poured between the end faces 9 to connect the end faces 9.

As the low melting point metal 10, solder or the like having a melting point of about 135° C. can be used, but it is desirable that the metal has high tensile strength before melting.

Then, an insulating coating 11 such as enamel is provided around the outer periphery of the conductive wire 8 including this connection portion to form a winding 7.

The degaussing coil 6 is made by using such a winding 7 and winding it a plurality of times in a ring shape.

The bundle of winding wires 7 is insulated by wrapping a spiral insulating band 12 or an insulating tape around the outer periphery of the bundle.

FIG. 5 shows the main part thereof, and the connecting portion as shown in FIG. 4 is located in the area marked with an arrow.

If a plurality of such connection parts are provided in one degaussing coil 6 as shown in FIG. 5, safety can be further ensured.

Then, the degaussing coil 6 is attached to the shield case 14 of the cathode ray tube 13 and used with a tensile force applied to such a connection portion.

To apply a tensile force, when attaching the degaussing coil 6 using the mounting bracket 15 for attaching it to the shield case 14,
In order to fix the degaussing coil 6 in a tensioned state, the mounting bracket 15 can be attached slightly to the outer circumference, or when the winding 7 is wound as the degaussing coil 6, the connection part is located. For example, by winding the degaussing coil 6 with a large tensile force applied thereto, when the degaussing coil 6 is completed, the tensile force is applied to the connecting portion.

In the latter case, it is more convenient to apply adhesive resin to the outer periphery of the winding 7 while winding it, or to fix it with adhesive resin afterwards.

Since the degaussing coil 6 of the present invention is constructed as described above, if the degaussing coil 6 is activated due to a failure of the degaussing circuit and current continues to flow, etc., the low melting point metal 10 of the connecting part melts, and due to the tensile force exerted on this connection, the windings 7 on both sides separate and break, cutting off the current and ensuring safety.

Furthermore, if these connecting portions are provided at multiple locations in the degaussing coil 6, when any portion becomes overheated, a cutting action will be immediately activated at that portion, further improving safety.

In addition, at the cut portion, a low melting point metal 1 is inserted between the end surfaces 9 of the winding 7.
Since it is connected at 0, it does not get in the way like the conventional one with a temperature fuse, and it can be wound around the 11 feed roller and supplied to the automatic winding machine, automating the manufacturing process. It's easy to do.

Furthermore, the connection processing of this connection part can also be automated, and the overall manufacturing cost can be reduced to make it inexpensive.

As detailed above, according to the present invention, the wire is wound using only one type of conducting wire, and a part of the conducting wire is cut and connected with a low melting point metal, so that when the degaussing coil becomes overheated, The winding can be immediately cut to ensure safety, and the receptacle for this purpose is constructed by connecting the end faces of the winding with a low-melting point metal, making it possible to automate the manufacturing process and easily and inexpensively. It is something that can be realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a degaussing coil, FIG. 2 is a perspective view of a main part of a degaussing coil used in a conventional degaussing device, FIG. 3 is a perspective view of its connecting portion, and FIGS. 4A and 4B. C is a front view and a cross-sectional view of the winding of a degaussing coil used in a degaussing device according to an embodiment of the present invention during the manufacturing process; FIG. 5 is a perspective view of the main parts of the degaussing coil; FIG. It is a front view of the same device. 6... Demagnetizing coil, 7... Winding wire, 9... End face, 1
0...Low melting point metal, 11...Insulating coating, 12...
Insulator, 13...Cathode ray tube, 14...Shield case, 15...Mounting metal fittings.

Claims (1)

[Scope of utility model registration request] (1) As a degaussing coil, cut a part of the winding made of one type of conducting wire, butt the cut ends together, connect the end faces with a low melting point metal, and insulate the outer periphery of the connected part. A degaussing device that uses a coated degaussing coil and attaches the degaussing coil to a cathode ray tube while applying a tensile force to the connection portion. (The degaussing device according to claim 1 of the utility model registration claim, which is provided with a plurality of connecting parts.