JPH0136377Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a flyback transformer used in television receivers and the like.

(b) Prior art In recent years, focus-integrated flyback transformers, in which a focus resistor is integrally attached to a flyback transformer case, have become mainstream. A part of the transformer case is cut out to form a fitting part, and the case of the focus resistor is simply fitted to the fitting part, and the adhesive strength of the thermosetting insulating resin injected into the flyback transformer case is It is fixed by

However, the conventional mounting method relies on the adhesive strength of the insulating resin to fix the focus resistor, so it is easy to fall off until the insulating resin is completely cured.
It was difficult to fix it in place.

(c) Purpose of the invention The present invention has been devised in view of the above-mentioned drawbacks, and has a simple structure that allows the focus resistor to be easily attached to the flyback transformer case, and once installed, it is firmly fixed in that position. The purpose of this invention is to provide a flyback transformer with improved performance.

(d) Structure of the invention The flyback transformer of the invention has a U-shaped frame on the side surface of an insulating case in which the coil components are housed, and a U-shaped frame that extends inward toward the lower end of both side walls of the frame. A variable resistor case having an opening at one end, which has a protruding elastic claw piece integrally formed with an engaging hole in the upper wall of the frame, and a protruding wall that is fitted into the U-shaped frame. The variable resistor case is attached to the insulating case by providing a stepped portion on the bottom portion with which the elastic claw piece engages, and a protruding portion on the protruding wall that engages with the engagement hole.

(e) Embodiments Examples of the present invention will be described below with reference to the drawings.

1 to 4 relate to one embodiment of the present invention, in which 1 shows a low-voltage coil bobbin 3 around which a low-voltage coil 2 is wound, and a high-voltage coil bobbin 5 around which a high-voltage coil 4 is wound, which are arranged coaxially. A pair of U-shaped cores 8, 8 are inserted into the hollow part of the low-voltage coil bobbin 3 through a core insertion hole 7 provided in the case 1. As a result, a mouth-shaped magnetic path is formed.

A U-shaped frame portion 9 is provided on the side surface of the insulating case 1, and in this embodiment, a U-shaped inner frame portion 10 whose height is lower than that of the frame portion 9 is provided. It has a double structure forming a fitting groove 11.

Further, elastic claw pieces 1 are provided on the lower end sides of the side wall portions 9a, 9a of the frame portion 9, and protrude inwardly from the frame portion 9.
2 and 12 are integrally formed, and a pair of engagement holes 13 and 13 are bored in the upper wall portion 9b of this frame portion 9. Incidentally, in the frame portion 9, there is provided a notch 26 that extends into the insulating case 1 and through which a lead wire 14 (see FIG. 3) for supplying a focus voltage generation voltage is inserted.

Reference numeral 15 denotes a focus variable resistor, and rotary shafts 18 and 19 for adjusting the focus voltage and screen voltage are rotatably disposed at the bottom 17 of a variable resistor case 16 having an open end. is formed. Further, the variable resistor case 16 has a protrusion 2 that engages with the engagement hole 13.
1, a U-shaped protruding wall 22 is provided, and this protruding wall 22 is structured to be fitted into a fitting groove 11 of an insulating case 1 that accommodates the coil component 6.

Inside the variable resistor case 16 are sliders 23 and 2 driven by the rotating shafts 18 and 19.
4 and a ceramic substrate 25 on which a resistor (not shown) with which the sliders 23 and 24 are in sliding contact are printed. In order to apply the voltage to the resistor, the coil component 6 and the ceramic substrate 25 are connected by a lead wire 14 as shown in FIG. 3 or 4. After completing the necessary wiring in this way, the variable resistor case 1
The variable resistor 15 is attached by fitting the protruding wall 22 of 6 into the fitting groove 11 of the insulating case 1. At this time, the pair of elastic claw pieces 12 provided on the lower end side of the frame 9 The case 1 is elastically engaged with the stepped portion 20 of the variable resistor case 16.
The protrusions 21, 21 provided on the frame portion 6 engage with the engagement holes 13, 13 provided on the frame portion 9, respectively.

The protrusion 21 integrally provided on the variable resistor case 16 has a right-angled cross section with a tapered portion 21a whose height gradually decreases in the fitting direction (direction of arrow A) as shown in FIG. If the elastic claw piece 12 is formed into a triangular shape and provided with a tapered portion 12a that gradually becomes higher in the fitting direction as shown in FIG. 4, strong force will be required to attach the variable resistor case 16. It is easy to do without any problems, and once it is fitted, it will not come off easily.

After the focus resistor 15 is assembled into the insulating case 1 in this way, a thermosetting insulating resin such as epoxy is injected into the insulating case 1 from the opening 1a and is thermoset. It also flows into the space formed by the substrate 25 of the focus resistor 15 and the insulating case 1 through the notches 26 provided in the insulating case 1, and molds the focus resistor 15 as well.

The height of the protruding wall 22 of the variable resistor case 16 is set to 2 mm or more so that the protruding wall 22 is tightly fitted into the fitting groove 11 formed by the frame portion 9 and the inner frame portion 10. If an insulating resin containing an appropriate amount of inorganic filler such as quartz is used, the inorganic filler stops at the fitting portion to prevent resin leakage, so there is no need to separately apply a sealant to prevent resin leakage.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 to 7, in which the same parts as in the above embodiment are given the same figure numbers.

A U-shaped frame 9' into which the protruding wall 22' of the case 16' of the focus resistor 15' is fitted is provided on the side surface of the insulating case 1 in which the coil component 6 is housed. Unlike the embodiment described above, an inner frame portion is not provided, and a relatively large engagement hole 13' is provided in the upper wall portion 9b' of the frame portion 9'. Also,
The portion of the insulating case 1 located inside the frame 9' has a double wall as shown in FIG. It is formed.

On the other hand, a rib-shaped protrusion 21' that engages with the engagement hole 13' is provided at the upper end of the protruding wall 22' of the U-shaped variable resistor case 16'. ' is provided with a taper 21'a to enable smooth engagement with the engagement hole 13'.

When installing the focus resistor 15',
While inserting the protruding part 21' of the variable resistor case 16' into the engagement hole 13' from below the frame part 9', the protruding wall 21'
2' into the fitting groove 11'. By this,
The protrusion 21' engages with the engagement hole 13', and the protrusion wall 2
2' is fitted into the fitting groove 11', but at the same time, the elastic claw pieces 12', 12, which have been pushed apart, are elastically attached to the stepped portion 20 of the variable resistor case 16' by their restoring force. to engage. In addition, the fitting groove 1
1' and the protruding wall 22', the attachment of the focus resistor 15' becomes more secure, and when resin is injected into the insulating case 1, the fitting groove 11' and the protruding wall Since the fitting portion with 22' is in close contact, there is no risk of resin leaking from the fitting portion.

The amount of heat generated by the Joule heat generated by the resistor printed on the ceramic substrate 25 housed in the variable resistor case 16' is quite large, and the heat has an adverse effect on the coil component 6 and the rectifying diode D attached thereto. Although there may be a risk, in this embodiment, the coil component 6 and the focus resistor 1
Since an air layer 27 is provided between the coil component 5' and the coil component 6, good heat dissipation of the module heat generated in the resistor printed on the ceramic substrate 25 can be achieved.
Therefore, an adverse effect on the coil component 6, the rectifier diode D, or the insulating case 1 due to the heat generated in the substrate 25 can be avoided.

(f) Effects of the invention According to the invention, the focus resistor can be easily attached to the case of the flyback transformer with a simple structure, and moreover, it can be fixed very firmly in the attached state. Therefore, since the attachment position of the focus resistor to the flyback transformer case is completely fixed, a stable product can be obtained and assembly can be automated.

[Brief explanation of the drawing]

1 to 4 relate to an embodiment of the present invention,
FIG. 1 is a perspective view of a case of a flyback transformer, FIG. 2 is a perspective view of a focus resistor, and FIGS. 3 and 4 are exploded cross-sectional views showing essential parts of the flyback transformer. Figures 5 to 7
The figures relate to other embodiments of the present invention; FIG. 5 is a perspective view of a case of a flyback transformer, FIG. 6 is a perspective view of a focus resistor, and FIG. 7 is a sectional view of essential parts of the flyback transformer. . 1... Insulation case, 6... Coil parts, 9...
Frame portion, 9a...Side wall portion, 9b...Top wall portion, 12...
...Elastic claw piece, 13, 13'...Engagement hole, 16, 1
6'...Variable resistor case, 21, 21'...Protrusion, 22, 22'...Protrusion wall.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A U-shaped frame is provided on the side of the insulating case in which the coil components of the flyback transformer are housed, and a a variable shape with an opening at one end, which has an integrally formed elastic claw piece projecting toward the other side, a first engaging means provided on the upper wall of the frame, and a protruding wall fitted into the U-shaped frame; The bottom of the resistor case is provided with a stepped portion that engages with the elastic claw piece, and the protruding wall is provided with a second engagement means that engages with the first engagement means, so that the variable resistor case is connected to the insulator. A flyback transformer attached to the case. (2) The first engaging means is an engaging hole provided on the upper wall of the frame of the insulating case, and the second engaging means is a protrusion provided on the protruding wall. A flyback transformer according to claim 1 of the patented utility model.