JP3558437B2 - Flyback transformer - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flyback transformer for supplying a high voltage to a cathode ray tube such as a television receiver and a color display, and for supplying a focus voltage and a screen voltage as necessary to a cathode ray tube. It is about improving productivity.
[0002]
[Prior art]
A flyback transformer of a television receiver or the like generates a high voltage of 20 to 30 kV, supplies a DC high voltage to an anode of a cathode ray tube, and simultaneously has a focus voltage of 5 to 10 kV and a screen of 100 to 1000 V. Supplying voltage.
[0003]
FIG. 15 is a circuit diagram showing a connection state of a flyback transformer, a CRT, a high-voltage coil, and the like. In FIG. 1, reference numeral 1 denotes a flyback transformer, which comprises a low-voltage coil 2, a high-voltage coil 3, a diode 4, and the like. Reference numeral 5 denotes a cathode ray tube, which is connected to the electrodes 6, 6 ', 6 "at the output of the flyback transformer 1. The electrodes 6', 6" are divided by a resistor incorporated in the flyback transformer 1 to obtain a voltage. Output electrode.
[0004]
This resistor is composed of a combination of fixed resistors 7a, 7c, 7e and variable resistors 7b, 7d, and these resistors are generally collectively called a focus pack. 8 is a film capacitor, and 36 is a high-voltage resistor.
[0005]
FIG. 16 is a pattern diagram of the ceramic resistor 9 used in the flyback transformer 1. The resistor 9 is obtained by printing and firing a resistor 11 on a ceramic substrate 10, 7a ', 7c', and 7e 'are fixed resistor portions, 7b' and 7d 'are variable resistor portions, 12a to 12d are electrodes, and 12a is an electrode. Electrodes for the high voltage input section of the resistor 9, 12b and 12c are electrodes for taking out focus and screen voltages, and 12d is a ground electrode.
[0006]
FIG. 17 is a cross-sectional view of the flyback transformer, and the same parts as those in FIG. 15 are denoted by the same reference numerals. A low-voltage coil 2, a high-voltage coil 3 on which a diode 4 is mounted, and the like are housed in a plastic body case 13 of the flyback transformer 1. A resistor 9 to which metal terminals 14a to 14d are soldered, a rotary knob 15 for variable resistance, a brush 16, an insulating agent 17, and a sealing agent 18 are housed in a focus pack case 19 made of plastic.
[0007]
The lead wires 26 and 27 for taking out the focus voltage and the screen voltage are soldered to the metal terminals 14a and 14b, respectively, to form the focus pack 20, and the main body case 13 and the focus pack case 19 are press-fitted to each other to form an epoxy resin or the like. An insulating material 21 is filled in the flyback transformer main body. 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.
[0008]
The lead wires 26 and 27 are buried in the insulating material 21 from the connection portions 6 'and 6 "to the terminals 14a and 14b to the lead wire exit portion. A soft insulating agent 17 of a system or the like is injected and hardened.This soft insulating agent 17 is used to insulate the resistor 9 and to directly apply a stress generated when the hard insulating agent 21 is thermally hardened to the resistor 9. It is for suppressing the addition.
[0009]
[Problems to be solved by the invention]
When producing the focus pack 20, a complicated process of curing the sealing agent 18 while pressing the resistor 9 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 is used. Therefore, automation is difficult, work efficiency is poor, and cost increases.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems and to provide a flyback transformer that can be automated, has good production efficiency, and can be produced at a reasonable price.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides
A main body case that houses the high-voltage coil inside and opens toward the focus pack case side,
A conductive rubber is attached so as to penetrate from the body case side toward the focus pack case side, and an intermediate member having a size to close an opening of the body case,
With a focus pack case containing a resistor connected to a metal terminal inside,
Insert the lead wire of the high-voltage coil into the conductive rubber, fit the intermediate member into the main body case, close the opening of the main body case, and inject an insulating agent into the space defined by the main body case and the intermediate member. Harden,
The focus pack case is fitted to the intermediate member, a part of the metal terminal is stabbed into conductive rubber, and a high-voltage coil and a resistor are connected via the conductive rubber.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
As described above, the present invention closes the opening of the main body case with the intermediate member and injects and cures the insulating agent into the space defined by the main body case and the intermediate member. It is received by the intermediate member.
[0013]
Therefore, the conventional sealing agent is unnecessary, so that the complicated step of curing the sealing agent while pressing down the resistor with a force larger than the reaction force of the brush is omitted 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 be automated, has high production efficiency, and can be produced at a reasonable price.
[0014]
Hereinafter, specific examples of the present invention will be described 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 a shape of a terminal, FIG. 3 is a view showing a method of connecting a terminal and a connection part, and FIG. FIG. 5 is a view showing a connection state of a lead wire, FIG. 6 is a structural view showing a method of fixing a lead wire by a case and an intermediate member, and FIG. 7 is a view showing a fitting state of an intermediate member and a focus pack. 8 is a partially enlarged view of FIG. 7, and FIGS. 9 and 10 are enlarged cross-sectional views showing a fixing structure of a lead wire.
[0015]
As shown in FIG. 1, the low-voltage coil 2, the high-voltage coil 3 on which the diode 4 is mounted, and the like are housed in a plastic body case 13, and an opening is provided on the focus pack case 19 side of the body case 13. .
[0016]
The variable resistance rotary knob 15, the brush 16, the resistor 9 to which the metal terminals 25a to 25d are connected, and the like are housed in a plastic focus pack case 19, and an opening is also provided on the focus pack case 19 side. The resistor 9 is fixed to the focus pack case 19 by heat sealing or the like, and the core wires of the focus voltage output lead wire 26 and the screen voltage output lead wire 27 are connected to the output terminals 25a and 25d, and the lead wires 26 and 27 are connected. The focus pack 20 is pressed into the groove of the focus pack case 19.
[0017]
Between the main body case 13 and the focus pack case 19, an intermediate member 24 made of a plastic molded body having a size to close the openings of both is fitted and interposed. A plurality of through holes are provided at predetermined positions of the intermediate member 24 from the main body case 13 side to the focus pack case 19 side, and serve as a connection between input / output terminals of the focus pack 20 and internal components and a sealing agent. Conductive rubbers 23a, 23b, and 23c are inserted through the through holes, respectively, so that both ends are exposed.
[0018]
The conductive rubbers 23a, 23b, and 23c are locked by the intermediate member 24 so that the conductive rubbers 23a, 23b, and 23c do not escape toward the focus pack case 19 when the insulating material 21 is injected and cured.
[0019]
Further, components such as the film capacitor 8 and the high-voltage resistor 36 (see FIG. 12) are connected to the conductive rubber 23a and the like, and mounted on the plastic intermediate member 24.
[0020]
Then, the case 13 and the intermediate member 24 are press-fitted while the lead wire 3a of the high voltage coil 3 is pierced into the conductive rubber 23b, and in this state, a space defined by the case 13 and the intermediate member 24 is made of epoxy resin or the like. The insulating agent 21 is injected and cured.
[0021]
Next, the focus pack 20 is inserted into the conductive rubbers 23a, 23b, and 23c with the metal terminals 25a, 25b, and 25c, respectively, and the lead wires 26 and 27 are pressed into the grooves of the plastic intermediate member 24. 19 and the intermediate member 24 are fitted. Thus, the high voltage coil 3 and the resistor 9 are electrically connected via the conductive rubber 23b.
[0022]
2A and 2B show 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. (E) is a right side view, (f) is a rear view, and (g) is a development view.
[0023]
As shown in these figures, the terminal 25 has a sharp projection 28 connected to the conductive rubber 23 (23a, 23b, 23c) by being pierced, and a slit 29 connected to sandwich the core of the lead wires 26, 27. And a spring portion 30 sandwiched between the resistors 9 and connected to the electrode portion.
[0024]
FIGS. 3 and 4 are views showing the connection states of the terminal 25 and the resistor 9, the terminal 25 and the conductive rubber 23, and the terminal 25 and the lead wires 26 and 27, respectively. When the conductive rubber is not connected as in the case of the metal terminal 25d, the protrusion 28 is deleted and used. The shape of the slit portion 29 may be a cross-shaped cut, and the lead core wire may be press-fitted therein.
[0025]
As shown in FIG. 5, the lead wires 26 and 27 have their core wires connected to the metal terminals 25 a and 25 d and are bent at substantially right angles at the bent portions 31 a and 31 b of the focus pack 20 to be formed on the wall 32 of the focus pack case 19. Press into the groove and fix. This prevents external tensile or torsional stress applied to the lead wires 26 and 27 from being directly transmitted to the connection portions with the terminals 25a and 25d.
[0026]
As shown in FIG. 6, grooves 33 are provided so as to face the walls of the focus pack case 19 and the intermediate member 24, and the lead wires 26 and 27 are fitted by fitting the focus pack case 19 and the intermediate member 24 as shown in FIG. Is fixed.
[0027]
As shown in FIGS. 8 and 9, ribs 34 are provided on both sides of the entrance of the groove 33 into which the lead wires 26 and 27 are inserted, and a point 35 is provided at the center of the inside of the groove 33. The portions 35 are cut into the coating layers of the leads 26 and 27 so that the leads 26 and 27 are not twisted. Further, as shown in FIG. 10, the shape of the rib 34 (pointed end 35) is made acute to prevent the lead wires 26 and 27 from coming off.
[0028]
As shown in FIG. 9 and FIG. 10, the walls of the focus pack case 19 and the intermediate member 24 are formed in three or more layers so that the lead wires 26 and 27 can be firmly fixed, and the creepage distance for insulation is provided. Can be ensured sufficiently, thereby improving reliability. As shown in FIG. 10, a sharp rib 34 is also provided on the intermediate member 24 side, and cuts into the coating layers of the lead wires 26 and 27.
[0029]
Although this specific example has described the single focus type, this terminal and lead fixing structure can be applied to a flyback transformer of any circuit type. As an application example, a double focus type ceramic resistor is shown in FIG. 11, typical circuit diagrams are shown in FIGS. 12 and 13, and an internal connection diagram of the focus pack is shown in FIG. 15 and 16 are denoted by the same reference numerals and description thereof is omitted.
[0030]
【The invention's effect】
As described above, the present invention closes the opening of the main body case with the intermediate member and injects and cures the insulating agent into the space defined by the main body case and the intermediate member. It is received by the intermediate member.
[0031]
Therefore, the conventional sealing agent is unnecessary, so that the complicated step of curing the sealing agent while pressing down the resistor with a force larger than the reaction force of the brush is omitted 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 be automated, has high production efficiency, and can be produced at a reasonable price.
[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 between the terminal and each connection component.
FIG. 4 is an explanatory diagram showing a connection state between the terminal and each connection component.
FIG. 5 is a structural diagram showing a connection state of lead wires.
FIG. 6 is a view showing a method of fixing a lead wire by a case and an intermediate member.
FIG. 7 is a view showing a fitted state of the intermediate member and the focus pack.
FIG. 8 is a partially enlarged view of FIG. 7;
FIG. 9 is a view showing a method of fixing a lead wire by a case.
FIG. 10 is a view showing a method of fixing a lead wire by a case and an 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]
DESCRIPTION OF SYMBOLS 1 Flyback transformer 2 Low voltage coil 3 High voltage coil 4 Diode 5 CRT 6 Electrode 7 Resistor 8 Film capacitor 9 Ceramic resistor 10 Ceramic substrate 11 Resistor 12 Electrode 13 Body case 14 Metal terminal 15 Rotary knob 16 for variable resistance 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 section 29 Slit section 30 Spring section 31 Lead wire bending section 32 wall 33 groove 34 rib 35 pointed end 36 high resistance

Claims (1)

A main body case that houses the high-voltage coil inside and opens toward the focus pack case side,
A conductive rubber is attached so as to penetrate from the body case side toward the focus pack case side, and an intermediate member having a size to close an opening of the body case,
With a focus pack case containing a resistor connected to a metal terminal inside,
Insert the lead wire of the high-voltage coil into the conductive rubber, fit the intermediate member into the main body case, close the opening of the main body case, and inject an insulating agent into the space defined by the main body case and the intermediate member. Harden,
A flyback, wherein the focus pack case is fitted to the intermediate member, a part of the metal terminal is stabbed into conductive rubber, and a high-voltage coil and a resistor are connected via the conductive rubber. Trance.

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