JPH0765748A - Deflection yoke - Google Patents

Abstract

PURPOSE:To reduce misconvergence or vibration drift by fitting a large cover having a predetermined shape to a flange at the tip of a horizontal deflection coil bobbin, and filling a resin excellent in heat conductivity. CONSTITUTION:An annular large cover 5 having a u-shaped cross section is fitted to flanges 6, 8 of a horizontal deflection coil bobbin 2. A fitting rib 16 disposed on an outer wall 13 of the large cover 5 is fitted to a cutout 7 of the flange 6. A hook piece 17 of the rib 16 is locked to the tip of a locking piece 9 disposed in the flange 8. A hook piece 18 provided on the inner wall 15 of the cover 5 is fitted to a locking hole 11 formed on a drum 10 of the bobbin 2, thus connecting the cover 5 to the bobbin 2. A resin injecting hole 12 is formed on the flange 8. A resin 22 is injected into the cover 5 by a resin injecting tool 21, followed by hardening. Heat generated in a horizontal deflection coil is absorbed by the hardened resin 22 excellent in heat conductivity, to be thus propagated to the outside air through the bobbin 2 and the core 4. Consequently, it is possible to effectively radiate the heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke used in a television receiver.

[0002]

2. Description of the Related Art Generally, a deflection yoke has a higher frequency, and accordingly, the deflection yoke itself generates a large amount of heat, which causes misconvergence and amplitude drift.

As shown in FIGS. 5 and 6, the deflection yoke comprises a horizontal deflection coil 1, a horizontal deflection coil bobbin 2, a vertical deflection coil 3 and a core 4 arranged in this order from the inside of the deflection yoke.

These respective components are arranged independently of each other, and when an electric load is applied to the horizontal deflection coil 1 and the vertical deflection coil 3, Joule heat is generated inside the conductor due to copper loss and eddy current loss. And have a fever. The heat release is due to the conduction of air and the horizontal coil bobbin 2 and the heat radiation from the core 4.

[0005]

Air, which is a heat dissipation path between the coils or between the bobbins in the conventional deflection yoke, plays a heat insulating effect in the television receiver, and as a result, is generated in the deflection yoke. The heat generated cannot be released to the outside, which causes misconvergence and amplitude drift.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a deflection yoke which effectively dissipates heat generated by a horizontal coil and reduces misconvergence, amplitude drift and the like.

[0007]

In order to achieve the above-mentioned object, the present invention is to install a large cover having a boat bottom cross section and an annular shape in a flange portion at the tip of a horizontal deflection coil bobbin so that the large cover is provided in the large cover. The deflection yoke is filled with a resin having good thermal conductivity.

[0008]

In the deflection yoke having the above structure, the heat generated in the horizontal deflection coil is absorbed by the resin in the large cover, and is radiated through the horizontal deflection coil bobbin and the core to prevent misconvergence and amplitude drift.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those shown as the conventional example will be described using the same reference numerals.

The horizontal deflection coil bobbin 2 shown in FIG. 1 is provided with the vertical deflection coil 3 and the core 4 as shown in FIG. 3, and the tip of the horizontal deflection coil bobbin 2 is shown in FIGS.
The large cover 5 indicated by is attached. The specific mounting structure of the large cover 5 is such that the outermost edge of the first flange 6 of the horizontal deflection coil bobbin 2 is formed with a recess 7 for fitting, and the second flange 8 on the inner side of the recess 7 has A locking piece 9 is provided at a portion corresponding to the recess 7. The locking piece 9 is supported by the side piece so as to have a certain height from the inner surface of the second flange 8. Furthermore, the horizontal deflection coil bobbin 2
A locking hole 11 is formed near the locking piece 9 of the body portion 10. A resin injection hole 12 is formed near the locking hole 9 in the second flange 8 of the horizontal deflection coil bobbin 2. The large cover 5 includes an outer wall 13, a bottom plate 14, and an inner wall 15.
Is formed in a boat bottom shape in cross section, and is formed in an annular shape so as to fit into the first and second flanges 6 and 8 of the horizontal deflection coil bobbin 2. The outer wall 13 is provided with a fitting rib 16 that fits into the recess 7 of the first flange 6 of the horizontal deflection coil bobbin 2, and the fitting rib 1
A hook piece 17 is provided on the 6th part. A hook piece 18 is also formed on the edge of the inner wall 15 of the large cover 5. 1
Reference numeral 9 denotes a die-drilling hole for forming the hook piece 18, and 2
Reference numeral 0 is a die-cutting hole of the large cover 5.

The above-mentioned components are assembled as follows. That is, the annular large cover 5 is fitted to the first and second flanges 6 and 8 of the horizontal deflection coil bobbin 2,
Further, a fitting rib 16 provided on the outer wall 13 of the large cover 5 is fitted into the recess 7 of the first flange 6. Then, the hook piece 17 of the fitting rib 16 is attached to the second flange 8
It is locked to the tip of the locking piece 9 provided on the. Also, a large cover 5
The hook piece 18 provided on the inner wall 15 is engaged with the locking hole 11 formed in the body portion 10 of the horizontal deflection coil bobbin 2 to connect the large cover 5 to the horizontal deflection coil bobbin 2.

With respect to the above-mentioned assembly, as shown in FIG. 4, the resin 22 degassed with the resin injecting tool 21 is larger than the resin injecting hole 12 formed in the second flange 8 of the horizontal deflection coil boil 2. Inject into 5. The resin 22
Is selected to have thermal conductivity, has a low viscosity at the time of injection, and is filled in the large cover 5 and hardened.

In this structure, the heat generated in the horizontal deflection coil 1 is absorbed by the cured resin 22 having good thermal conductivity, propagates to the outside air through the horizontal deflection coil bobbin 2 and the core 4, and is efficiently radiated. .

Here, the resin 22 injected into the large cover 5 is bent horizontally at the opening to horizontally deflect the coil 1.
Also, it penetrates into the horizontal deflection coil bobbin 2 and a part of the vertical deflection coil 3 to improve heat transfer between the respective constituent members, and also plays a role of fixing at least the vertical deflection coil 3. In addition, the large cover 5 has a die hole 20 for forming the hook piece 17, but since the hole 20 is separated by the fitting rib 16, the injected resin 22 is the hole. No more than 20 leaks. In addition,
Conventionally, as shown in FIG. 7, the hole 2 in the large cover 5
Since 0'communicates to the inside, the large resin cover 5
Even if it is injected inside, it will leak and cannot be used.

As shown in FIG. 3, the inner wall 15 of the large cover 5 has a hole 19 for forming the hook piece 18. The position of the hole 19 is higher than that of the second flange 8. Therefore, the resin 22 does not leak from the hole 19.

[0016]

As is clear from the description of the above embodiment,
According to the present invention, since a large cover having a boat bottom cross section and an annular shape is fitted to the flange portion at the tip of the horizontal deflection coil bobbin, and a resin having good heat conductivity is injected into the large cover and cured, the horizontal deflection coil is produced. The resin absorbs the heat and radiates the heat through the horizontal deflection coil bobbin and the core, and the heat is effectively radiated, so that the deflection yoke having less misconvergence and amplitude drift can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a horizontal deflection coil bobbin in a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a perspective view of main parts of the horizontal deflection coil bobbin and the large cover.

FIG. 3 is a sectional view of an essential part of the deflection yoke.

FIG. 4 is a schematic sectional view of an essential part for explaining resin injection of the deflection yoke.

FIG. 5 is a side view of a conventional deflection yoke.

FIG. 6 is a sectional view of the deflection yoke.

FIG. 7 is a cross-sectional view of a main part of the deflection yoke.

[Explanation of symbols]

 1 Horizontal Deflection Coil 2 Horizontal Deflection Coil Bobbin 3 Vertical Deflection Coil 4 Core 5 Large Cover 6 First Flange 7 Recessed Notch 8 Second Flange 9 Locking Piece 10 Body 11 Locking Hole 12 Resin Injection Hole 13 Outer Wall 14 Bottom Plate 15 Inner wall 16 Fitting rib 17 Hook piece 18 Hook piece 19 Vent hole 20 Vent hole 22 Resin

Claims (5)

[Claims] 1. A deflection yoke in which a large annular cover having a boat bottom cross section is fitted to a flange portion at the tip of a horizontal deflection coil bobbin, and the large cover is filled with a resin having good thermal conductivity. 2. The deflection yoke according to claim 1, wherein the resin in the large cover is provided by injection curing. 3. The deflection yoke according to claim 1, wherein a part of the resin is impregnated into the horizontal deflection coil bobbin and the vertical deflection coil. 4. A horizontal deflection coil bobbin has a first flange having a recess on the outer periphery, and a second flange corresponding to the first flange and having a locking piece and a resin injection port located on the recess. The large cover has, on its outer wall, a fitting rib that fits into the recess and a hook piece that engages with the locking piece, and the inner wall has a hook that engages with the locking hole of the body of the horizontal deflection coil bobbin. And a fitting rib of the large cover is fitted in the recess of the first flange, a hook piece of the outer wall is engaged with a locking piece of the second flange, and the hook piece of the inner wall is horizontally deflected. The deflection yoke according to claim 1, wherein the deflection yoke is locked in a locking hole of a body of the coil bobbin. 5. The deflection yoke according to claim 4, wherein the large cover has a bottom plate with a die-cutting hole for forming hook pieces on the outer wall, and the die-cutting holes are separated by fitting ribs.