JPH11345729A - Fly-back transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fly-back transformer with good production performance. SOLUTION: The fly-back transformer is formed with synthetic resin. An L-shape curved part 34 of a core wire 24 exposed from the coated part of a lead wire for output voltage 22 is pressed in a cylindrical holding part 29 having a slit 31 extending in the axial direction. Thus, the area of the base of the L-shape curved part 34 is held elastically with the cylindrical holding part 29. The pointed end of the core wire 24 is plugged in conductive rubber part connecting to the output part by being projected from the cylindrical holding part 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer for applying a focus voltage and, if necessary, a screen voltage to a cathode ray tube of a television receiver, a color display or the like, and more particularly to a voltage output lead wire in the flyback transformer. And a holding structure.

[0002]

2. Description of the Related Art Flyback transformers used for television receivers, color displays, and the like are 20 to 30 flyback transformers.
A high voltage of kV is generated, a high DC voltage is supplied to the anode of the cathode ray tube, and a focus voltage of 5 to 10 kV and a screen voltage of 100 to 1000 V are supplied at the same time.

FIG. 13 is a circuit diagram showing a connection state of a flyback transformer, a cathode ray tube, a high-voltage coil, and the like. In FIG. 1, a flyback transformer 1 includes a low-voltage coil 2,
It is composed of a high voltage coil 3, a diode 4, and the like.
The CRT 5 is connected to the electrodes 6, 6 ', 6 "at the output of the flyback transformer 1. The electrodes 6', 6".
Is an output electrode of a voltage obtained by voltage division by a resistor incorporated in the flyback transformer 1.

[0004] The resistors are fixed resistors 7a, 7c, 7e.
And variable resistors 7b and 7d, and these resistors are generally collectively called a focus pack. 8 is a film capacitor and 9 is a fixed resistor.

FIG. 14 is a plan view of a focus pack in a conventional flyback transformer, and FIG. 15 is a plan view of a flyback transformer in which the focus pack and the flyback transformer main body are integrated. In the figure, 10 is a covering portion of a focus voltage output lead wire, 11 is a covering portion of a screen voltage output lead wire, 12 is a connection portion obtained by wrapping a lead wire core on a focus pack terminal and soldering it.
Is a focus pack case, and 9 is a fixed resistor.

In a conventional method of connecting a focus voltage output lead wire and a screen voltage output lead wire of a flyback transformer, a core wire of the lead wire is directly connected to a terminal of a focus pack and soldered.

[0007]

As described above, in the prior art,
Since the core wire of the lead wire is wrapped around the terminal of the focus pack and soldered, there is a drawback that automatic mounting is difficult, connection is not easy, and work efficiency is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flyback transformer which solves the above-mentioned drawbacks of the prior art, can easily connect voltage output leads, can be automatically mounted, and can improve productivity. is there.

[0009]

In order to achieve the above-mentioned object, the present invention relates to a cylindrical holding portion made of a synthetic resin molded body and having a slit extending in an axial direction, for example, a focus voltage output lead wire or a clean voltage. The L-shaped bent portion of the core wire exposed from the coating portion of the voltage output lead wire such as the output lead wire is press-fitted, the vicinity of the base of the L-shaped bent portion is elastically held by the cylindrical holding portion, and the tip of the core wire Is projected from the cylindrical holding portion and inserted into a conductive rubber connected to the output portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, according to the present invention, the fixing and connection of the voltage output lead wire can be easily performed by press-fitting the core wire into the slit of the cylindrical holding portion and inserting the core wire into the conductive rubber. , Automatic mounting is possible and productivity can be improved. Also, since the vicinity of the base of the L-shaped bent portion of the core wire is elastically held by the cylindrical holding portion, the core wire is securely fixed,
Reliability can be improved. Moreover, since the core wire is firmly held in the slit of the cylindrical holding part, the core wire does not bend when inserting the core wire into the conductive rubber,
Work efficiency is good.

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a lead wire holding case in a flyback transformer, and FIG.
X-ray cross-sectional view, FIG. 3 is a side view of the lead wire holding case,
FIG. 4 is a partially enlarged cross-sectional view before holding the focus voltage output lead wire in the lead wire holding case, and FIG. 5 is a holding claw, cylindrical holding portion, and fitting before holding the focus voltage output lead wire in the lead wire holding case. FIG. 6 is a partially enlarged plan view showing a state of the groove, FIG. 6 is a partially enlarged sectional view showing a state where a focus voltage output lead wire is held in a lead wire holding case, and FIG.
Is a partially enlarged plan view showing a state where a focus voltage output lead wire is held in a lead wire holding case, FIG. 8 is a partially enlarged side view showing a state before holding a screen voltage output lead wire in a lead wire holding case, 9 is a partially enlarged side view showing a state where the screen voltage output lead wire is held in the lead wire holding case, FIG. 10 is a partial cross-sectional view showing a state where the lead wire holding case is mounted on the focus case, and FIG. FIG. 12 is a partial front view showing a state before the wire holding case is mounted on the focus case, and FIG. 12 is a partial front view showing a state where the lead wire holding case is mounted on the focus case.

A lead wire holding case 21 made of a synthetic resin molded article has an elongated shape as shown in FIG. 1 and two focus voltage output lead wires 22 on the upper surface as shown in FIG.
a and 22b hold one screen voltage output lead 23 on the side as shown in FIG.

The focus voltage output leads 22a, 22
b denotes the core wires 24a and 24b and the covering portion 25 covering the outer circumference thereof.
a, 25b, and as shown in FIG.
Two holding grooves 26 for inserting 25b are provided in parallel,
A plurality of ribs 27 extending in a direction orthogonal to the longitudinal direction of the coating portions 25a and 25b are formed on both side walls of the holding groove 26 so as to face or shift with each other. , 25b are fixed.

The center wires 24a, 24
A holding claw 28 and a cylindrical holding portion 29 are provided at a position opposed to b, and two holding claws 28 are arranged in parallel as shown in FIG.
The holding claw 28 extends in the axial direction at the center of the cylindrical holding portion 29.
A slit 31 opening toward the side is formed, and a fitting groove 30 is formed from the root of the two holding claws 28 to the root of the slit 31 (see FIGS. 4 and 5). The spacing W1 of the holding claws 28, the width W2 of the slit 31, and the width W3 of the fitting groove 30 are slightly smaller than the diameter D1 of the core wire 24 (W1 = W2 = W3 <D1).

As shown in FIG. 4, the tip of the core wire 24 is cut obliquely to form a sharp end 32. When the focus voltage output lead wire 22 is mounted on the lead wire holding case 21, the core wire extends linearly. 24 is placed on the cylindrical holding portion 29 from the holding claw 28, and the core wire 24 is
Is forcibly fitted into the fitting groove 30. W1 = W2 =
Because of the relationship of W3 <D, the core wire 24 is bent substantially in an L-shape at the root of the cylindrical holding portion 29 by this forced fitting, and the holding claws 28, the slits 31 and the fitting grooves 30 are elastically slightly expanded. The L-shaped bent portion 34 of the core wire 24 is firmly fixed by the restoring force. In particular, the pinching claw 28 has a function of preventing the core wire 24 from being lifted up.
Reference numeral 9 has a function of holding the pointed end 32 of the core wire 24 vertically. An inclined surface for guiding is formed on the upper part of the holding claw 28 and the cylindrical holding portion 29 in order to smoothly insert the core wire 24 forcibly.

As shown in FIG. 3, the screen voltage output lead wire 23 comprises a core wire 35 and a covering portion 36 covering the outer periphery thereof. As shown in FIG. 8, the covering portion 36 is inserted into the side surface of the lead wire holding case 21. Holding groove 37 is formed. A plurality of ribs 38 extending in a direction perpendicular to the longitudinal direction of the covering portion 36 are formed on both side walls of the holding groove 37 so as to face or shift, and the ribs 38 bite into the covering portion 36 to fix the covering portion 36. .

As shown in FIG. 8, an L-shaped groove 39 is formed at a position facing the core 35 on the center line of the holding groove 37,
A cylindrical holding portion 40 is provided above the L-shaped groove portion 39, and extends in the axial direction at the center of the cylindrical holding portion 40, and the L-shaped groove portion 3
9 is formed, and the width W4 of the slit 41 is slightly smaller than the diameter D2 of the core wire 35 (see FIG. 9) (W4 <D2).

As shown in FIG. 9, the tip of the core wire 35 is cut obliquely to form a pointed portion 42. Before attaching the screen voltage output lead wire 23 to the lead wire holding case 21, the core wire 35 is L-shaped bent part 43
Is forcibly fitted from the L-shaped groove portion 39 to the slit 41 of the cylindrical holding portion 40 such that the pointed end portion 42 slightly protrudes from the cylindrical holding portion 40. Since the relation of W4 <D is satisfied, the slit 41 is elastically slightly expanded by the forced fitting, and the L-shaped bent portion 43 of the core wire 24 is firmly fixed by the restoring force. The cylindrical holding part 40 has the core wire 3
5 has a function of vertically holding the tip 42.

As shown in FIG. 3, the lead wire holding case 21
At a plurality of positions (three positions in the present embodiment) on the outer periphery of the outer peripheral surface, a locking frame 45 having a side surface shape of a rectangular shape protrudes. A locking claw 47 having an inclined surface 46 is formed at a position facing each locking frame 45 of the focus pack case 44 to which the lead wire holding case 21 is attached, as shown in FIG. Further, as shown in FIG. 10, conductive rubbers 48 are respectively installed at positions corresponding to the core wires 24a, 24b, 35 of the focus pack case 44. Although not shown, each conductive rubber 48 is an output of the flyback transformer 1. Are connected to the electrodes 6, 6 ', 6 ".

As shown in FIG. 11, the focus voltage output leads 22a and 22b and the screen voltage output lead 2
When the lead wire holding case 21 storing and holding the wire 3 is put on the focus pack case 44, the lower end portion of the locking frame 45 is slightly pushed outward while riding on the inclined surface 46 of the locking claw 47. When the lead wire holding case 21 is further lowered, the sharp ends 32, 3 of the core wires 24a, 24b, 35
At the same time as shown in FIG. 10, the locking claws 47 are fitted into the hollow portions of the locking frames 45, and the lower ends of the locking claws 47 are fitted into the frame portions of the locking frames 45. , The lead wire holding case 21 is firmly fixed to the focus pack case 44, and the insertion state of the core wires 24a, 24b, 35 into the conductive rubber 48 is ensured.

[0021]

According to the first aspect of the present invention, the fixing and connection of the voltage output lead wire can be easily performed by press-fitting the core wire into the slit of the cylindrical holding portion and inserting the core wire into the conductive rubber. , Automatic mounting is possible and productivity can be improved. Also, since the vicinity of the base of the L-shaped bent portion of the core wire is elastically held by the cylindrical holding portion, the core wire is securely fixed,
Reliability can be improved. Moreover, since the core wire is firmly held in the slit of the cylindrical holding part, the core wire does not bend when inserting the core wire into the conductive rubber,
Work efficiency is good.

According to the second aspect of the present invention, since the core wire is elastically held by the holding pieces to prevent the core wire from floating, the voltage output lead wire is securely fixed.

According to the third aspect of the present invention, since the core wire is held by the fitting groove, the voltage output lead wire can be more securely fixed.

According to the fourth aspect of the present invention, since the L-shaped bent portion of the core wire is press-fitted and held from the L-shaped groove to the slit of the cylindrical holding portion, the voltage output lead wire is securely fixed.

According to the fifth aspect of the present invention, the state of insertion of the core wire into the conductive rubber is maintained by the engagement between the locking portion and the locked portion, so that the core wire comes off from the conductive rubber due to an external force or the like. It has features such as no.

[Brief description of the drawings]

FIG. 1 is a plan view of a lead wire holding case in a flyback transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken on line XX of FIG. 1;

FIG. 3 is a side view of the lead wire holding case.

FIG. 4 is a partially enlarged cross-sectional view before a focus voltage output lead wire is held in the lead wire holding case.

FIG. 5 is a partially enlarged plan view showing a state of a holding claw, a cylindrical holding portion, and a fitting groove before holding a focus voltage output lead wire in the lead wire holding case.

FIG. 6 is a partially enlarged cross-sectional view showing a state where a focus voltage output lead wire is held in the lead wire holding case.

FIG. 7 is a partially enlarged plan view showing a state where a focus voltage output lead wire is held in the lead wire holding case.

FIG. 8 is a partially enlarged side view showing a state before a screen voltage output lead wire is held in the lead wire holding case.

FIG. 9 is a partially enlarged side view showing a state where a screen voltage output lead wire is held in the lead wire holding case.

FIG. 10 is a partial cross-sectional view showing a state where the lead wire holding case is mounted on the focus case.

FIG. 11 is a partial front view showing a state before the lead wire holding case is mounted on the focus case.

FIG. 12 is a partial front view showing a state where the lead wire holding case is mounted on the focus case.

FIG. 13 is a circuit diagram showing a connection state of a flyback transformer, a cathode ray tube, a high-voltage coil, and the like.

FIG. 14 is a plan view of a focus pack in a conventional flyback transformer.

FIG. 15 is a plan view of a flyback transformer in which the focus pack and the flyback transformer main body are integrated.

[Explanation of symbols]

 Reference Signs List 1 flyback transformer 6 electrode 21 lead wire holding case 22a, 22b focus voltage output lead wire 23 screen voltage output lead wire 24a, 24b, 35 core wire 25a, 25b, 36 covering portion 26, 37 holding groove 27, 38 rib 28 holding piece 29, 40 cylindrical holder 30 fitting groove 31, 41 slit 32, 42 pointed end 33 jig 34, 43 L-shaped bent portion 39 L-shaped groove 44 focus pack case 45 locking frame 46 inclined surface 47 locking claw 48 conductive Rubber W1 Spacing between holding pieces W2, W3 Slit width D1, D2 Core wire diameter

Claims (5)

[Claims] An L-shaped bent portion of a core wire exposed from a covering portion of a voltage output lead wire is press-fitted into a cylindrical holding portion formed of a synthetic resin molded body and having a slit extending in an axial direction,
A fly near the base of the L-shaped bent portion, which is elastically held by a cylindrical holding portion, and wherein the tip of the core wire protrudes from the cylindrical holding portion and is inserted into a conductive rubber connected to an output portion. Back transformer. 2. A holding member according to claim 1, wherein a holding piece for preventing the core wire from being lifted is provided near the cylindrical holding portion, and a part of the core wire is elastically held by the holding piece. Features a flyback transformer. 3. The flyback transformer according to claim 2, wherein a fitting groove for elastically fitting a part of the core wire is formed from a root of the holding piece to a root of the cylindrical holding part. . 4. An L-shaped groove communicating with a slit is formed at a lower end of the cylindrical holder, according to claim 1,
A flyback transformer, wherein the L-shaped bent portion of the core wire is press-fitted from the L-shaped groove to the slit of the cylindrical holding portion. 5. The lead holding case according to claim 1, wherein the cylindrical holding portion is provided on a lead wire holding case, and the locking portion is provided on one of the lead wire holding case and the focus pack case to which the lead wire holding case is attached. A flyback transformer, wherein a locked portion is formed on the other side, and the state of insertion of the core wire into the conductive rubber is maintained by engagement of the locking portion and the locked portion.