JPS5814516Y2 - Cathode ray tube deflection yoke - Google Patents

Description

[Detailed description of the invention] The present invention relates to a deflection yoke for a cathode ray tube using a core in which a plurality of grooves are formed at least on the inner surface along the tube axis direction of the cathode ray tube. The purpose is to propose a device that can be well insulated and separated from the vertical deflection coil.

Conventionally, in a cathode ray tube, a deflection yoke is provided as an electromagnetic deflection device in which horizontal and vertical deflection coils are attached to a core formed of a magnetic material.

As the core of this deflection yoke, for example, a so-called casterate core 1 as shown in FIG. 1 is used.

This is a core in which a plurality of grooves are formed at least on the inner surface of the core along the tube axis direction of the cathode ray tube.

The outer shape of the casterate core 1 is a hollow truncated cone, and 30 is an opening facing the neck of the cathode ray tube, and 31 is an opening facing the screen side of the cathode ray tube.
The inner surface has, for example, 16 rectangular grooves 2°3, radially.
... has been drilled.

FIG. 2 is a partial cross-sectional view of the casterite core 1 shown in FIG. 1, and this shows an enlarged view of one groove, for example, the groove 2, provided on the inner surface of the casterate core 1.

A vertical deflection coil 2 is inserted into the core 1 through this groove 2.
3 is wound in a toroidal shape, and a horizontal deflection coil 24 is wound around the core 1 in a saddle shape in the upper part of the groove 2.

Since a voltage of about io ov is usually applied between the vertical deflection coil 23 and the horizontal deflection coil 24, an insulating material 25 is placed between them in order to isolate the two coils. is mediated.

However, in this case, the insulating material 25 must be provided along each of the plurality of radially provided grooves 2, 3, etc., and it is assumed that the insulating material 25 spanning all the grooves is manufactured in one piece. However, the shape of the deflection yoke becomes complicated, and manufacturing of the deflection yoke becomes complicated.

In view of the above, the present invention proposes a deflection yoke for a cathode ray tube that has a simple structure and can easily insulate and separate the horizontal deflection coil and the vertical deflection coil without using such an insulating material.

Hereinafter, an embodiment of the deflection yoke of the cathode ray tube of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG.

In FIGS. 3 and 4, parts corresponding to those in FIGS. 1 and 2 will be described with the same reference numerals.

Fig. 3 shows only the castellated core 1 used in the present invention. and a second recessed portion having a width smaller than this.

The cross-sectional view of FIG. 4 shows a groove 2 as an example, and the groove 2 is provided through a first recess 2a facing the end surface 1a of the core 1 and a step 26 deep inside the first recess 2a. It is configured with a second recess 2b having a width smaller than this.

A horizontal deflection coil 24 is arranged in a saddle shape in the first recess 2a, and a vertical deflection coil 23 is arranged in a toroidal shape in the second recess 2b. A gap 27 is formed between the cylindrical member 23 and the cylindrical member 23.

This horizontal deflection coil 24 is desirably arranged in contact with the first recess 2a by using a rectangular wire or a round wire wound in an aligned manner as a wire material and solidifying the coil so that its cross section is rectangular. .

Further, the vertical deflection coil 23 is the horizontal deflection coil 24 described above.
The coil may have a similar shape, but a conventional round wire may also be used.

The vertical deflection coil 23 and the horizontal deflection coil 24
Due to the gap created between the two coils, the two coils are insulated without the need for the insulating material 25.

Note that an insulating material having higher insulation resistance than air may be inserted into the gap 27.

Thus, according to the deflection yoke of the cathode ray tube of the present invention, a plurality of grooves are formed in at least the inner surface of the core along the tube axis direction, and these grooves are provided in the first recess and the depth of the first recess. For example, a horizontal deflection coil is arranged in the first four parts and a vertical deflection coil is arranged in the second recess. Since a gap is formed between the horizontal deflection coil and the vertical coil, the horizontal deflection coil and the vertical deflection coil can be reliably insulated and separated without using an insulating material, and the deflection yoke can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a castellate core used in a conventional electromagnetic deflection device for a cathode ray tube, FIG. 2 is a cross-sectional view of the groove of the castellate core shown in FIG. 1, and FIG. FIG. 4 is a perspective view of an example of a casterate core used for the deflection yoke, and FIG. 4 is a sectional view of the groove of the casterate core shown in FIG. 3. 1 is a casterate core, 2 and 3 are grooves, 2a is a first recess, and 2b is a second recess.

Claims (1)

[Scope of utility model registration request] Forming multiple grooves extending in the tube axis direction on the inner surface of the core,
A deflection yoke for a cathode ray tube, wherein each of the plurality of grooves is constituted by a first recess and a second recess with a smaller width provided deep inside the first recess.