JPH04147546A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To install an annular core for toroidal coil to an insulating frame by passing a small diameter part of an insulating frame, of which diameter is smaller than the inner diameter of a core for toroidal coil, through the annular core for toroidal coil, and providing projections for abutting on the end surface of the core for toroidal coil in the back surface of a fixed cover fixed to a cathode ray tube. CONSTITUTION:A band 2 is installed to a fixing piece 4, and a fixed cover 1 is fixed to an insulating frame 6 by fitting a fitting claw part 5 for installing the fixed cover 1 to the insulating frame 6 in a flange part 7 of the insulating frame 6. Each two projections 8 in right and left, namely, four projections in total for positioning a core 9 for toroidal coil are provided in the back surface of the fixed cover 1. The core 9 for toroidal coil is annular, and has the individual structure, and the inner diameter D1 thereof is made a little larger than the outer diameter D2 of a small diameter part of the insulating frame 6. At the time of assembly, a vertical deflecting coil is wound around of the annular core 9 for toroidal coil. The core 9 for toroidal coil is installed in the insulating frame 6 in this condition.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a deflection yoke installed in a cathode ray tube of a television receiver, etc. Among the conventional deflection yokes, there is a saddle type horizontal deflection coil with high precision. There is a method called split winding in which the winding is divided into multiple slots in order to obtain a winding distribution of 100%.In order to perform such split winding, an insulating frame made of synthetic resin is used, and each slot is formed in this insulating frame. FIG. 7 shows an example of a deflection yoke equipped with an insulating frame for split winding.
1 is a small diameter f! pointing towards the electron gun of the cathode ray tube. 22 is a large-diameter portion facing toward the fluorescent screen of the cathode ray tube. Wire distribution i1 in each slot from the center to the outside. Even if the setting is made to obtain the desired magnetic field distribution, the wire flux in each slot is In the small diameter part 21 and the large diameter part 22,
Each is hooked on the rib for hooking electric wires A23
is a core for winding a vertical deflection coil.Usually, this type of core is fired in an annular shape, divided at one end at a dividing line 24, and rejoined with a fixing fitting 25 when attached to an insulating frame 20. Actually, before joining, core 23
The vertical deflection coil is toroidally wound around the coil.Although omitted in the figure, 26 is an elastic rib cut out radially on the side surface of the insulating frame 20, and is used to position the core 23.In other words, the elastic rib 26 is By pushing the core 23 in the direction of arrow A and pressing the core 23 against the contact surface formed on the large diameter portion 22, the core 23 is positioned at a predetermined position on the insulating frame 20. As a means of fixing to 20, epoxy synthetic resin etc. (
However, in the above configuration, it is necessary to separate the core 23 before attaching it to the insulating frame 20. At the same time, it is necessary to fit the fixing fittings 25 into the core, and the addition of the dividing and joining process creates a problem in that the magnetic properties of the core vary. The present invention has been made in view of the above problems, and has a configuration in which elastic ribs are provided on the insulating frame 20 (which would complicate the back mold and was not practical). The purpose of the present invention is to provide a deflection yoke that can be eliminated.Means for solving the problems The present invention aims to solve the above problems. The toroidal winding core is configured to be smaller than that of the toroidal winding core, which is provided on the back side of the fixing cover that covers the small diameter part of the insulating frame, and is provided to fix the toroidal winding core to the cathode ray tube. Effect of providing a protrusion that comes into contact with the end face of the core By configuring as described above, it is possible to mount the toroidal winding core, which remains annular, on the insulating frame, and the protrusion of the fixed cover touches the end face of the toroidal winding core. This toroidal winding core is positioned at a predetermined position on the insulating frame by contacting the toroidal winding core.Embodiment Hereinafter, embodiments of the deflection yoke of the present invention will be explained.Figure 1 shows the deflection yoke of this embodiment. Side view of the fixed cover 1 that covers the small diameter part of the insulating frame used. Figure 2 is a bottom view of the fixed cover 1 seen from the direction of arrow B. 2 shows the deflection yoke tightly fixed to the neck of the cathode ray tube. It's a band for
3 is a through hole of the fixed cover 1, through which the neck of the cathode ray tube passes; 4 is a plurality of fixing pieces erected around the through hole 3 of the fixed cover 1; is attached to the fixing piece 4 as shown by the arrow, and 5 is an engaging claw portion for attaching the fixed cover 1 to the insulating frame 6 shown in FIG. The fixed cover 1 can be fixed to the insulating frame 6 by engaging the flange 7 of the
Note that the insulating frame 6 shown in Fig. 3 is different from the commonly seen two-part type, and is pre-formed in one piece. The toroidal winding core 9 is wound by a method called winding.The protrusion 8 is protruded from the back surface of the fixed cover 1 and is used to position the toroidal winding core 9 shown in FIG. 4.The protrusion 8 is shown in FIG. As shown in Fig. 4, the toroidal winding core 9 is annular and has an undivided structure, even though there are four in total, two on the left and right. Even though the outer diameter D2 of the small diameter portion of 6 is somewhat larger than the outer diameter D2, at the time of assembly, the vertical deflection coil 1O is first wound around the toroidal winding core 9 which remains annular as shown in FIG. The core 9 for toroidal winding is the insulating frame 6
Fig. 5 shows a state in which the toroidal winding core 9 is attached to the insulating frame L and the fixed cover 1 is attached to the insulating frame 6. The protrusion 8 abuts the end surface of the toroidal winding core 9.
Then, the elastic force received from the protrusion 8 causes the large-diameter end face of the toroidal winding core to come into contact with the contact portion 11 on the insulating frame 6, and the toroidal winding core 9 is positioned at a predetermined position on the insulating frame 1. Effects of the Invention As described above, the present invention provides a toroidal winding core in which the outer diameter of the small diameter portion of the insulating frame is smaller than the inner diameter of the toroidal winding core, and the small diameter portion remains annular. to allow penetration into
By providing a protrusion that comes into contact with the end face of the toroidal winding core on the back side of the fixing cover provided for fixing it to the cathode ray tube, it is possible to mount the toroidal winding core, which remains annular, on the insulating frame. It is possible to eliminate the process of dividing and joining the toroidal winding core, and the protrusion of the fixed cover comes into contact with the end face of the toroidal winding core to position the toroidal winding core at a predetermined position on the insulating frame. Therefore, there is no need to provide an elastic piece for positioning on the insulating frame.

[Brief explanation of the drawing]

Figure 1 is a side view of the fixed cover of the deflection yoke in this embodiment. Figure 2 is a bottom view of the fixed cover. Figure 3 is a side view of the insulating frame of the deflection yoke in this embodiment. A perspective view of the core for toroidal winding. Fig. 5 is a side view showing the state in which the core for toroidal winding is wound.
The figure is a side view of the completed deflection yoke in this example.
FIG. 7 is a side view of a conventional deflection yoke. 1: Fixed cover 2: / India 3: Through hole 4: Fixing piece 5: Engagement claw part
6: Insulating frame 7: Flange 8: Protrusion 9 Nidroidal winding core lO: Vertical deflection coil ll: Name of contact agent Akira Kokaji, patent attorney, and 2 other names 50

Claims (1)

[Scope of Claims] A substantially horn-shaped insulating frame for slot-winding a horizontal deflection coil, and a fixing means for covering a small diameter portion of the insulating frame and being coupled to the insulating frame to fix it to a cathode ray tube. In a deflection yoke equipped with a fixed cover and an annular core wrapped with a toroidal type vertical deflection coil, the maximum outer diameter of the small diameter portion of the insulating frame is made smaller than the inner diameter of the core so that the small diameter is smaller than the inner diameter of the core. The fixing cover is configured such that the annular core can be penetrated by the annular core, and a protrusion is provided on the back surface of the fixed cover that protrudes in the tube axis direction and comes into contact with the end surface of the annular core on the small-diameter side, and the annular shape pushed by the protrusion A deflection yoke characterized in that an end face of the core on the large-diameter side is brought into contact with an abutment surface formed on the large-diameter part of the insulating frame.