JPH05109538A - Flyback transformer - Google Patents

Abstract

PURPOSE:To prevent resin leakage and resin bleeding of an epoxy resin by fitting a sealant into the fitting part of an outer case and a focus volume instead of its coating. CONSTITUTION:The side wall of a focus volume fitting groove of an outer case contacts the side wall of a rib of the focus volume 10 in the full periphery; further, a gap 8a is provided between the bottom of the outer case groove and the rib tip of the focus volume 10. This design allows an epoxy resin not to leak out of the fitting part of the outer case and the focus volume 10, and resin leakage and bleeding of an epoxy resin due to capillarity accumulate in the gap 8a, so that it is unnecessary to coat the fitting part of the outer case and the focus volume 10 with a sealant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer (hereinafter referred to as a "flyback transformer" used in a color television receiver (hereinafter abbreviated as CTV) or a display device using a cathode ray tube (hereinafter abbreviated as CRT) of a computer terminal. , FBT
Abbreviated).

[0002]

2. Description of the Related Art In recent years, electronic devices have been produced in a variety of products in small quantities, such as general-purpose models and limited models for specific customers. However, productivity improvement, quality improvement, cost reduction, Work environment problems have been devised and improved.

A conventional FBT will be described below with reference to the drawings. As shown in FIGS. 6 to 10, the conventional F
BT is a diode (not shown) that rectifies the output pulse of the ferrite core 1, the primary winding 3, the secondary coil bobbin 4, the secondary winding 5, and the secondary winding 5, and a component that fixes the diode. It was composed of a fixed plate (not shown), an epoxy resin 7 as an insulating material, an outer case 8, a hocus volume 10, and a sealing material 11 for sealing, and the like.

Regarding the FBT constructed as described above,
The operation will be described below. The FBT supplies a high voltage (about 20 to 33 kV) to the CRT in order to accelerate thermoelectrons generated from the cathode of the CTV of the CTV. Also F
In order to generate a high voltage, the BT is connected to the secondary winding 5, which is a high voltage part, a diode, a component fixing plate, and a hocus volume 10 for adjusting the hocus voltage supplied to the CRT, and its transformer is made of an insulating material. Stored in the outer case 8 molded with, the outer case 8 and the hocus volume 1
Sealing material 11 for sealing is applied to the fitting portion with 0 and filled with epoxy resin 7.

[0005]

However, in the above-mentioned conventional configuration, it is necessary to apply the sealing material 11 for sealing in order to prevent the resin leakage of the epoxy resin 7. Therefore, the sealing material applying device, the applying step, and the sealing material. A curing step is required, and the maintenance time of the equipment and the time loss in the above-mentioned production step occur, resulting in poor productivity.

Further, variations in the amount of the sealing material applied, defective resin bleeding and defective resin leakage of the epoxy resin 7 due to the capillary phenomenon occur, which impedes quality improvement, and the sealing material 11 contains an organic solvent. As it is included in the work environment,
It had a problem that it had an adverse effect.

The present invention solves the above-mentioned conventional problems. A flyback transformer which prevents leakage of epoxy resin and the like by simply fitting the outer casing and the hocus volume without fitting a sealing material to the fitting portion. The purpose is to provide.

[0008]

In order to achieve the above object, the flyback transformer of the present invention adopts a system in which the fitting portion between the outer case and the hocus volume is sandwiched around the entire circumference. By providing the fixing projections for and, there is no notch in the groove that inserts the rib of the hocus volume of the outer case, and the inner wall of the groove of the outer case and the outer wall of the hocus volume rib are all in contact with each other. The structure is such that a fixing recess is provided on the outer case side to fix the protrusion provided on the hocus volume side, and a gap is provided between the bottom of the groove of the outer case and the tip of the hocus volume. is doing.

[0009]

With the above-mentioned structure, the present invention has the epoxy resin for filling so that the fitting portion between the outer case and the hocus volume is sandwiched between the outer case and the resin, so that the resin does not leak and the capillary phenomenon is caused. The resin leak will not be leaked at all because it will be accumulated in the gap provided between the outer case and the hocus volume. Therefore, the sealing material can be eliminated altogether.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

As shown in FIG. 1, ferrite cores 1, 1
Secondary coil bobbin 2, primary winding 3, secondary coil bobbin 4, secondary winding 5 provided as a high voltage winding, diode (not shown), epoxy resin 7 as insulating material, outer case 8, CRT It comprises a hocus volume 10 for adjusting the hocus voltage supplied to the.

The operation of the flyback transformer configured as described above will be described. Ferrite core 1
The primary winding is arranged in a cylindrical shape on the outer periphery of the core, and the secondary winding 5 composed of a plurality of winding portions is arranged on the outer periphery of the primary winding.
Each winding part is connected by a diode, and the transformer body to which the hocus volume 10 is connected is housed in an outer case 8 and insulated with an epoxy resin 7.

Next, in FIGS. 2 and 5 showing enlarged views of the fitting portion of the outer case 8 and the hocus volume 10, the ribs of the hocus volume 10 are provided in the grooves 8b of the outer case 8.
In the fitted state, a gap 8a is provided between the bottom of the groove 8b of the outer case 8 and the rib tip of the hocus volume 10. By providing this gap 8a, the exterior case 8
The structure is such that the epoxy resin 7 rising from the fitting portion of the hocus volume 10 due to a capillary phenomenon is stored in the gap 8a, and the epoxy resin 7 does not leak outside and does not ooze out.

Further, as shown in FIG. 9 of the conventional example, the projection 8c for fixing the volume of the hocus is provided on the outer case 8. However, in this structure, the notch 8e is formed in the outer case 8 so that the whole case 8 has a cutout 8e. Since the groove 8b could not be formed on the circumference and resin leakage and resin bleeding had occurred, FIG.
Then, the recess 8d for fixing the hocus volume is provided on the outer case 8 side and the projection is provided on the side of the hocus volume to fix the hocus volume, so that the groove 8b can be provided on the entire circumference of the outer case 8. The inner wall of the groove 8b and the outer wall of the rib of the hocus volume 10 are all in contact with each other.

[0015]

As is apparent from the above embodiments, according to the present invention, since the sealing material for sealing is not required, the sealing material application step is eliminated, the material cost of the sealing material is unnecessary, and further the resin leakage is defective. Disappears. In addition, since a clean working environment can be secured because no organic solvent is used, cost reduction due to process simplification, quality improvement, working environment improvement, etc. can be realized, and an excellent flyback transformer can be realized. Is.

[Brief description of drawings]

FIG. 1 is an external side view of a flyback transformer according to an embodiment of the present invention.

[Fig. 2] Enlarged view of the assembly and assembly part of the flyback transformer body and the hocus volume.

[Fig. 3] Assembly drawing of the flyback transformer body and the hocus volume.

FIG. 4 is an external side view of an outer case of the flyback transformer.

FIG. 5 is an enlarged view of a hocus volume fitting part of an outer case of the flyback transformer.

FIG. 6 is an external side view of a conventional flyback transformer.

[Fig. 7] Enlarged view of the assembly and fitting part of the flyback transformer body and the hocus volume.

FIG. 8 is an assembly drawing of the flyback transformer body and the hocus volume.

FIG. 9 is an external side view of an outer case of the flyback transformer.

FIG. 10 is an enlarged view of a hocus volume fitting part of an outer case of the flyback transformer.

[Explanation of symbols]

 5 Secondary Winding (High Voltage Winding) 8 Exterior Case 8a Gap (External Case and Hocus Volume Fitting Part) 8b Exterior Case Groove 8d Hocus Volume Fixing Recess 10 Hocus Volume

Claims (2)

[Claims] 1. A high voltage winding for generating a high voltage, a rectifying element provided for rectifying a high voltage pulse generated in the high voltage winding, and the high voltage winding and the rectifying element are housed in an outer case. Then, a hocus volume for adjusting the hocus voltage supplied to the cathode ray tube of the television receiver is provided, the hocus voltage terminal of the high-voltage winding and the input part of the hocus volume are connected, and the hocus is attached to the outer case. A flyback transformer in which a gap is provided between the bottom of the groove formed by two parallel plate-shaped ribs provided for volume fitting and the tip of the plate-shaped rib provided on the hocus volume. 2. An outer case is provided between two parallel plate-shaped ribs provided for fitting the hocus volume, and the opposing surfaces of the parallel ribs are provided for fitting the hocus volume. 2. The flyback transformer according to claim 1, wherein both sides of the plate-shaped rib are in surface contact with each other at a fitting portion thereof.