JPS6011543Y2 - deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a side pinless self-convergence type deflection yoke to be mounted on a cathode ray tube, and particularly to a deflection yoke equipped with a V-shaped vertical deflection coil.

In this type of deflection yoke, the vertical deflection coil is accurately positioned relative to the core and wound toroidally in a V-shape. A winding guide having a plurality of winding locking pieces is provided at the open end of the tail portion.

However, since the winding guide located at the tail opening end of the core has a smaller diameter than the winding guide located at the head opening end of the core, the groove width between the winding locking grooves is also narrower, and the vertical Since the deflection coil is wound in a V-shape, it is wound very thickly.

For this reason, the shape of the tail of the core differs depending on how the vertical deflection coil is wound, and when fitting the core to the outer periphery of the bobbin, the core cannot be fixed and positioned evenly and reliably. was there.

The present invention improves the drawbacks of the conventional deflection yoke, and will be described below with reference to embodiments shown in the drawings.

In the drawings, 1 indicates a deflection yoke, and the deflection yoke 1
1, a core 2 formed by being divided into two in the vertical direction of the plane of the paper, a vertical deflection coil 3 wound toroidally in a V-shape around the outer periphery of the core 2, and a vertical deflection coil 3 as shown in FIGS. 2 to 4. It consists of a bobbin 4 having a shape, and a horizontal deflection coil (not shown) wound around the inner peripheral surface of the bobbin 4 in a saddle shape.

The deflection yoke 1 is fixedly mounted on the cathode ray tube 5 by attaching the bobbin 4 to a fastening piece 41 formed on the tail side of the cathode ray tube 5 via a band 6.

Here, the bobbin 4 is molded from a resin material such as plastic, and is divided into two halves 4A and 4B as shown in detail in FIGS. In addition, a head enlarged portion 42, a tail enlarged portion 43, and an outer circumferential surface 44 on which the core 2 around which the vertical deflection coil 3 is wound is located.
Consists of etc.

A pair of engagement protrusions 7, 7 are protrudingly provided on the bobbin 4 near the enlarged tail portion of the outer circumferential surface 44 and located on the abutting surfaces of the half portions 4A, 4B. 7 is composed of half portions 7A and 7B, and is formed with a stepped portion 71 on which the inner circumferential surface of a winding guide, which will be described later, is seated, and the upper portion of the stepped portion 71 is a small end portion 72.

Further, the head opening end 21 of the core 2. Ring-shaped winding guides 8 and 9 are attached and fixed to the tail opening end 22, respectively, by adhesive, crimping, etc., and each of the winding guides 8 and 9 has a plurality of winding locking grooves 81 and 91, respectively. They are provided at predetermined intervals in the circumferential direction.

Therefore, the vertical deflection coil 3 is toroidally wound in a V-shape so that the winding does not collapse between the winding locking grooves 81 and 91.

Furthermore, the winding guide 9 located on the tail open end 22 side of the core 2 is provided with engagement grooves 92 and 92 at positions into which the pair of engagement protrusions 7 are fitted. The small end 72 of the engagement protrusion 7 is fitted, and the inner circumferential surface of the winding guide 9 is seated on the step 71, thereby fixing the core 2 in position.

In the deflection yoke configured as described above, the core 2 having the vertical deflection coil 3 wound in a V-shape between the winding locking grooves 81 and 91 formed in the winding guides 8 and 9 is attached to the bobbin 4. When attaching to the outer circumferential surface 44, an engagement groove 92 formed in the winding guide 9 is formed in the engagement protrusion 7 protruding from the bobbin 4.
When the core 2 is inserted, the position of the core 2 is regulated and fixed at an optimum position on the bobbin 4.

At this time, since the locking protrusion 7 is provided with a stepped portion 71, when the inner circumferential surface of the winding guide 9 is seated on the stepped portion 71 as shown by the imaginary line in FIG. It is possible to reliably position and fix the vertical deflection coil 3 regardless of the winding state of the wound vertical deflection coil 3.

In particular, since the core 2 has a small diameter on the tail opening end 22 side and the vertical deflection coil 3 is wound in a V-shape, the vertical deflection coil 3 is thick at this part, but the stepped part 71 is used for positioning. Therefore, the core 2 can be fixed regardless of the winding state of the vertical deflection coil 3.

Moreover, the engaging protrusion 7 is the half portion 4A of the bobbin 4.

Since it is located on the abutting surface of 4B, the engagement groove 9
When the engaging protrusion 7 is fitted into the bobbin 2, it also has a fastening effect on the bobbin 4, so that the half portions 4A and 4B do not come off.

The deflection yoke of the present invention is as described in detail above,
It has many effects such as those listed below.

■ A pair of engaging protrusions having a stepped portion are protruded near the enlarged tail part of the outer periphery of the bobbin, and when the pair of engaging protrusions are fitted into the winding guide located on the open end side of the tail part of the core, the winding Since the inner peripheral surface of the wire guide is provided with an engagement groove that fixes the core in position by seating on the stepped portion, the winding state of the vertical deflection coil wound in a V-shape around the winding guide can be changed. The core can be reliably fixed in position regardless of the situation.

■ In relation to item (■) above, the tail opening end of the core has a smaller diameter than the head opening end, and the vertical deflection coil has a V
Since the vertical deflection coil is wound in a letter-shaped shape, the vertical deflection coil is wound thicker on the open end side of the tail portion, but this thickness can be absorbed by the stepped portion of the engagement protrusion.

(2) When the bobbin is formed by dividing the bobbin into two parts, if the engaging protrusion is formed on the abutting surfaces of the halves, a fastening effect is applied to the bobbin, and the abutment of the bobbin does not loosen.

[Brief explanation of drawings]

Figure 1 is a front view of the deflection yoke according to the present invention, Figure 2 is a front view of the bobbin, Figure 3 is a side view of Figure 2, Figure 4 is an enlarged perspective view of the engagement protrusion, and Figure 5 is a front view of the deflection yoke according to the present invention. FIG. 3 is a perspective view showing a state in which the locking protrusion and the winding guide are locked together. 1... Deflection yoke, 2... Core, 21
...Head opening end, 22...Tail opening end, 3...Vertical deflection coil, 4...Bobbin, 42...Head Enlarged portion, 5...Cathode ray tube, 6...Band, 7...Engaging protrusion, 71...Stepped portion, 72...・Small end, 8
, 9... Winding guide, 81, 91...
Winding locking groove, 92... Engagement groove.

Claims (2)

[Scope of utility model registration request] (1) Having a winding guide at the head opening end and the tail opening end,
A deflection yoke in which a core formed by winding a vertical deflection coil in a V-shape between each of the winding guides is fitted between an expanded head portion and an expanded tail portion on the outer periphery of the bobbin, the expanded tail portion on the outer periphery of the bobbin; A pair of engaging protrusions having a stepped portion are protrudingly provided in the vicinity, and when the pair of engaging protrusions are fitted into the winding guide located on the tail open end side of the core, the inner circumferential surface of the winding guide is fitted. A deflection yoke characterized in that an engagement groove is provided for fixing the position of the core by seating the core on the step portion. (2) The deflection yoke according to claim (1), which is a registered utility model, wherein the bobbin is formed by dividing into two parts, and each of the pair of locking protrusions is provided to protrude from an abutting surface of the bobbin.