JPH09186035A - Flyback transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer which is capable of automating, excellent in production efficiency, and manufactured at a low cost. SOLUTION: This transformer is provided with the following: a main body case 13 which accommodates a high voltage coil in the inside and has an aperture toward a focus pack case 19 side, an intermediate member 24 which fixes conductive rubber 23 (23a-23c) penetrating from the main body case 13 side to the focus pack case 19 side and has the size closing the aperture of the main case 13, and the focus pack case 19 which accommodates a resistor 9 connecting metal terminals 25(25a-25d). Lead wires of the high voltage coil 3 are stuck into the conductive rubber 23. The intermediate member 24 is fitted to the main body case 13, and closes the aperture of the main body case 13. Insulating material 21 is injected in a space divided and formed by the main body case 13 and the intermediate member 24 and hardened. The focus pack case 19 is fitted to the intermediate member 24, and a part of the metal terminals 25 is stuck into the conducting rubber 23. Thus the high voltage coil 3 is connected with the resistor 9.

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 supplying a high voltage to a cathode ray tube of a television receiver, a color display or the like, and a focus voltage and a screen voltage to a cathode ray tube. In particular, the present invention relates to improvement in productivity of flyback transformers.

[0002]

2. Description of the Related Art A flyback transformer such as a television receiver generates a high voltage of 20 to 30 kV and supplies a high DC voltage to an anode of a cathode ray tube and simultaneously outputs 5 to 10 kV.
Focus voltage of kV, screen of 100-1000V
Supply voltage.

FIG. 15 is a circuit diagram showing a connection state of a flyback transformer, a cathode ray tube, a high voltage coil and the like. In the figure, 1 is a flyback transformer, which is composed of a low-voltage coil 2, a high-voltage coil 3, a diode 4, and the like. A cathode ray tube 5 is connected to the electrodes 6, 6 ', 6 "of the output part of the flyback transformer 1. The electrodes 6',
6 ″ is an output electrode of a voltage obtained by dividing the voltage with a resistor incorporated in the flyback transformer 1.

This resistor is a fixed resistor 7a, 7c, 7e.
And a combination of variable resistors 7b and 7d, and these resistors are generally collectively referred to as a focus pack. Reference numeral 8 is a film capacitor, and 36 is a high voltage resistor.

FIG. 16 is a pattern diagram of the ceramic resistor 9 used in the flyback transformer 1. Resistor 9
Is a ceramic substrate 10 on which a resistor 11 is printed and fired, and 7a ', 7c' and 7e 'are fixed resistance portions, 7b' and 7e.
d'is a variable resistance part, 12a to 12d are electrodes, 12a is a high voltage input part electrode of the resistor 9, and 12b and 12c are fo- ers.
An electrode for extracting dust and screen voltage, and 12d for grounding.

FIG. 17 is a sectional view of the flyback transformer, and the same parts as those in FIG. 15 are designated by the same reference numerals. The low-voltage coil 2, the high-voltage coil 3 having the diode 4 mounted thereon, and the like are plastic body case 13 of the flyback transformer 1.
It is stored in. Resistor 9 to which metal terminals 14a to 14d are soldered, rotary knob 15 for variable resistance, brush 16,
The insulating agent 17 and the sealing agent 18 are housed in a plastic focus pack case 19.

The lead wires 26 and 27 for extracting the focus voltage and the screen voltage are connected to the metal terminals 14a and 1 respectively.
The focus pack 20 is soldered to 4b, the main body case 13 and the focus pack case 19 are press-fitted, and the insulating agent 21 such as epoxy resin is filled inside the flyback transformer main body. The outlet portions of the lead wires 26 and 27 are covered with a heat-shrinkable rubber tube 22 to prevent the insulating agent 21 from leaking.

The lead wires 26 and 27 are connected to the terminals 14a,
An insulating material 21 is buried between the connecting portions 6 ′ and 6 ″ with the lead wire 14b and the lead wire outlet portion. A soft insulating material 17 such as an epoxy-based material is provided on the flyback transformer body side of the resistor 9.
Has been injection cured. The soft insulating agent 17 serves to insulate the resistor 9 and to prevent the stress generated when the hard insulating agent 21 is thermoset from being directly applied to the resistor 9.

[0009]

When the focus pack 20 is produced, the resistor 9 is applied with a force larger than the reaction force of the brush 16 so that the insulating agent 17 does not flow out to the variable resistor side of the resistor 9. A complicated process of hardening the sealing agent 18 while pressing it down is required, which makes automation difficult, the work efficiency is poor, and the cost is high.

An object of the present invention is to solve the conventional problems,
It is to provide a flyback transformer that can be automated, has high production efficiency, and can be produced at a reasonable price.

[0011]

In order to achieve the above object, the present invention provides a main body case which houses a high voltage coil therein and opens toward the focus pack case side, and a focus pack case from the main body case side. A conductive rubber is attached so as to penetrate toward the side, and an intermediate member having a size that closes the opening of the main body case, and a focus pack case in which a resistor connected to a metal terminal is housed are provided, Insert the lead wire of the high-voltage coil into the conductive rubber, fit the intermediate member to the main body case to close the opening of the main body case, and inject the insulating agent into the space defined by the main body case and the intermediate member to cure. The focus pack case is fitted to the intermediate member, part of the metal terminal is pierced into the conductive rubber, and the high voltage coil and the resistor are inserted through the conductive rubber. Characterized in that allowed connect.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, according to the present invention, the opening of the main body case is closed by the intermediate member, and the insulating agent is injected into the space defined by the main body case and the intermediate member to cure the insulating agent. The stress generated at the time of curing the is received by the intermediate member.

Therefore, the conventional sealing agent is not required, and thus the sealing agent is hardened while pressing the resistor with a force larger than the reaction force of the brush so that the insulating agent does not flow out to the variable resistor side of the resistor. It is possible to provide a flyback transformer that can omit steps, can be automated, has high production efficiency, and can be produced at a cost.

Specific examples of the present invention will be described below with reference to FIGS. In these figures, the same parts as those in FIGS. 1 is a cross-sectional view of a flyback transformer, FIG. 2 is a view showing the shape of terminals, and FIG.
Is a diagram showing a connection method of terminals and connection parts, FIG. 4 is a diagram showing a connection state of terminals, resistors, lead wires, and conductive rubber,
5 is a view showing a connection state of the lead wires, FIG. 6 is a structural view showing a method of fixing the lead wires by the case and the intermediate member, FIG. 7 is a view showing a fitted state of the intermediate member and the focus pack, FIG.
7 is a partially enlarged view of FIG. 7, and FIGS. 9 and 10 are enlarged sectional views showing a lead wire fixing structure.

As shown in FIG. 1, a low voltage coil 2 and a high voltage coil 3 having a diode 4 mounted therein are housed in a plastic main body case 13, and an opening is provided on the focus pack case 19 side of the main body case 13. Has been.

The rotary knob 15 for variable resistance, the brush 16, the resistor 9 to which the metal terminals 25a to 25d are connected are housed in a plastic focus pack case 19, and an opening is also provided on the focus pack case 19 side. ing. The resistor 9 is fixed to the focus pack case 19 by heat sealing or the like, and the lead wire 26 for focus voltage output is used.
The core wire of the screen voltage output lead wire 27 is connected to the output terminals 25a and 25d, and the lead wires 26 and 27 are press-fitted into the grooves of the focus pack case 19 to form the focus pack 20.

Between the body case 13 and the focus pack case 19, an intermediate member 24 made of a plastic molding having a size that closes the openings of the two is interposed by fitting. A plurality of through holes penetrating from the main body case 13 side to the focus pack case 19 side are provided at predetermined positions of the intermediate member 24, and serve as connection between input / output terminals of the focus pack 20 and internal parts and as a sealing agent. The conductive rubbers 23a, 23b, 23c are inserted into the through holes, respectively, and held so that both ends are exposed.

The conductive rubbers 23a, 23b and 23c are attached to the focus pack case 1 when the insulating agent 21 is injected and cured.
The conductive rubbers 23a, 23b,
23 c is locked by the intermediate member 24.

The film capacitor 8 and the high voltage resistor 3
Parts such as 6 (see FIG. 12) are connected to the conductive rubber 23a and mounted on the plastic intermediate member 24.

Then, the lead wire 3a of the high-voltage coil 3 is pierced into the conductive rubber 23b, and the case 13 and the intermediate member 24 are press-fitted into each other. An insulating agent 21 made of, for example, is injected and cured.

Next, the focus pack 20 is formed by using conductive rubbers 23a, 23b, 23c and metal terminals 25a, 25.
b, 25c and lead wires 26, 2 respectively
The focus pack case 19 and the intermediate member 24 are fitted to each other while press-fitting 7 into the groove of the plastic intermediate member 24. In this way, the high voltage coil 3 and the resistor 9 are electrically connected via the conductive rubber 23b.

2A and 2B are views showing the shape of the metal terminal 25. FIG. 2A is a front view of the terminal 25, FIG. 2B is a plan view, FIG. 2C is a bottom view, and FIG. ) Is a left side view, same figure (e)
Is a right side view, (f) is a rear view, and (g) is a developed view.

As shown in these figures, the terminal 25 is inserted by inserting a sharp projection 28 which is pierced into the conductive rubber 23 (23a, 23b, 23c) and connected, and a core wire of the lead wires 26, 27. It has a slit portion 29 and a spring portion 30 that is bent in a dogleg shape to sandwich the resistor 9 and connect to the electrode portion.

3 and 4 show the terminal 25, the resistor 9 and the terminal 2.
5 is a diagram showing a connection state of each of 5 and the conductive rubber 23, and a terminal 25 and lead wires 26 and 27. FIG. The metal terminal 2
When not connected to conductive rubber like 5d, the protrusion 2
Delete 8 and use. It is also possible to make a cross-shaped cut in the shape of the slit portion 29 and press fit the lead core wire there.

As shown in FIG. 5, the lead wires 26 and 27 have core wires connected to the metal terminals 25a and 25d, and are bent substantially at right angles at the bent portions 31a and 31b in the focus pack 20 to form a wall 32 of the focus pack case 19. It is press-fitted and fixed in the groove portion formed in. As a result, the lead wires 26, 2
It is possible to prevent external tensile stress and torsional stress applied to 7 from being directly transmitted to the connection portions with the terminals 25a and 25d.

As shown in FIG. 6, the grooves 3 are formed so as to face the walls of the focus pack case 19 and the intermediate member 24, respectively.
Focus pack case 1 as shown in FIG.
The lead wires 26 and 27 are fixed by fitting 9 and the intermediate member 24.

As shown in FIGS. 8 and 9, the lead wires 26,
Ribs 34 are provided on both sides of the entrance of the groove 33 into which the 27 is inserted, and a pointed portion 35 is provided at the center of the inside of the groove 33. The rib 34 and the pointed portion 35 are connected to the lead wires 26, 27.
The lead wires 26, 2 by cutting into the coating layer of
I try not to twist 7. Further, as shown in FIG. 10, the shape of the rib 34 (pointed portion 35) is made to be an acute angle so that the lead wires 26 and 27 are prevented from coming off.

As shown in FIGS. 9 and 10, the lead packs 26 and 27 can be firmly fixed to each other by insulating the focus pack case 19 and the wall of the intermediate member 24 into three layers or more layers for insulation. The reliability can be improved because a sufficient creepage distance can be secured. As shown in FIG. 10, a rib 34 having an acute angle is provided also on the side of the intermediate member 24, and the lead wire 26,
It cuts into the coating layer of 27.

Although the specific example has been described with respect to the single focus type, this terminal and lead fixing structure can be applied to flyback transformers of any circuit system. As an application example, a double focus type ceramic resistor is shown in FIG. 11, and a typical circuit diagram is shown in FIG.
2, FIG. 13, and FIG. 14 shows an internal connection diagram of the focus pack. The same parts as those in FIGS. 15 and 16 are designated by the same reference numerals and the description thereof is omitted.

[0030]

As described above, according to the present invention, since the opening of the main body case is closed by the intermediate member and the insulating agent is injected into the space defined by the main body case and the intermediate member to be cured, the insulating agent is cured. The stress sometimes generated is received by the intermediate member.

Therefore, the conventional sealing agent is unnecessary, and thus the sealing agent is hardened while pressing the resistor with a force larger than the reaction force of the brush so that the insulating agent does not flow out to the variable resistor side of the resistor. It is possible to provide a flyback transformer that can omit steps, can be automated, has high production efficiency, and can be produced at a cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flyback transformer according to a specific example of the present invention.

FIG. 2 is a diagram showing a shape of a terminal used for the flyback transformer.

FIG. 3 is an explanatory diagram showing a connection state of the terminal and each connection component.

FIG. 4 is an explanatory diagram showing a connection state of the terminal and each connection component.

FIG. 5 is a structural diagram showing a connection state of lead wires.

FIG. 6 is a diagram showing a method of fixing a lead wire by a case and an intermediate member.

FIG. 7 is a diagram showing a fitted state of an intermediate member and a focus pack.

FIG. 8 is a partially enlarged view of FIG. 7;

FIG. 9 is a diagram showing a method of fixing a lead wire by a case.

FIG. 10 is a diagram showing a method of fixing the lead wire by the case and the intermediate member.

FIG. 11 is a pattern diagram of a double focus type ceramic resistor.

FIG. 12 is a circuit diagram of a double focus type flyback transformer.

FIG. 13 is a circuit diagram of another example of a double focus type flyback transformer.

FIG. 14 is a diagram showing an internal connection state in a double focus type focus pack.

FIG. 15 is a circuit diagram of a flyback transformer.

FIG. 16 is a pattern diagram of a ceramic resistor.

FIG. 17 is a sectional view of a conventional flyback transformer.

[Explanation of symbols]

 1 Flyback Transformer 2 Low Voltage Coil 3 High Voltage Coil 4 Diode 5 Braun Tube 6 Electrode 7 Resistor 8 Film Capacitor 9 Ceramic Resistor 10 Ceramic Substrate 11 Resistor 12 Electrode 13 Body Case 14 Metal Terminal 15 Variable Rotating Knob 16 Brush 17 Insulation Agent 19 Plastic case 20 Focus pack 21 Insulating agent 23 Conductive rubber 24 Plastic intermediate member 25 Metal terminal 26 Focus voltage output lead 27 Screen voltage output lead 28 Projection portion 29 Slit portion 30 Spring portion 31 Lead wire bending portion 32 wall 33 groove 34 rib 35 tip portion 36 high resistance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Sato Inventor, Masano Sato, Iwate Prefecture, No. 1 Kitano, Masaki, Mizusawa City, Hitachi Media Electronics Co., Ltd.

Claims (1)

[Claims] 1. A main body case having a high-voltage coil housed therein and opening toward the focus pack case side, and a conductive rubber attached so as to penetrate from the main body case side toward the focus pack case side. An intermediate member having a size that closes the opening of the case, and a focus pack case containing a resistor to which a metal terminal is connected are housed inside, and the lead wire of the high-voltage coil is pierced into a conductive rubber to The intermediate member is fitted to close the opening of the main body case, an insulating agent is injected into the space defined by the main body case and the intermediate member to be cured, and the focus pack case is fitted to the intermediate member. A flyback tiger characterized by inserting a part of the metal terminal into a conductive rubber and connecting the high-voltage coil and the resistor through the conductive rubber. Nest.