JPH0349374Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a flyback transformer that supplies high voltage to a television receiver, for example, and in particular, a flyback transformer that is equipped with a high voltage resistor such as a focus resistor or a screen resistor, and a smoothing capacitor. Regarding flyback transformers.

[Conventional technology]

In recent years, in addition to flyback transformers equipped with a high-voltage resistor, there are also known flyback transformers that are equipped with a high-voltage resistor and a smoothing capacitor. This type of flyback transformer is shown in FIGS. 2 and 3.

In the figure, 1 is a cylindrical main body case made of an insulating material, and a low voltage coil 4 and a high voltage coil 5 wound around a low voltage coil bobbin 2 and a high voltage coil bobbin 3, respectively, are housed in the main body case 1. There is. Reference numeral 6 denotes a resistance case mounting part provided on the outside of the main body case 1, into which a resistance case 8 to be described later is fitted.
A, a lower frame portion 6B, and left and right frame portions 6C and 6D form a protruding rectangular frame shape. The main body case 1 facing inside the resistance case mounting part 6
The surrounding wall serves as a reinforcing wall 7.

Reference numeral 8 denotes a resistance case fitted into the resistance case mounting portion 6, and the resistance case 8 has an upper side surface portion 8 from which a cylindrical focus voltage output line extraction portion 9 is protruded.
A, a lower side surface portion 8B, left and right side portions 8C, 8D in which U-shaped grooves 10, 10... are provided facing each other at positions near the upper and lower ends of the inner side, and a high voltage resistor 12 to be described later. It is formed into a housing shape by a front part 8E having a shaft insertion hole 11 through which the adjustment shaft 15 is inserted.

Reference numeral 12 denotes a high-voltage resistor as a focus resistor housed in the front side of the resistor case 8. The high-voltage resistor 12 is composed of a focus voltage variable resistor 13 printed as a thick film on a high-resistance substrate 14, and the focus An adjustment shaft 15 for varying the focus voltage is protruded from the front surface of the variable voltage resistor 13.
5 protrudes to the front side of the resistance case 8 through the shaft insertion hole 11. Reference numeral 16 denotes a smoothing capacitor installed between the output diode (not shown) on the high voltage output side and the ground in order to remove the ripple component of the high voltage output. By fitting the fitting portions 17, 17, which are protruded in a semicircular shape at the positions, into the grooves 10 of the resistor case 8, the rear part is placed on the rear side of the high voltage resistor 12 and placed inside the resistor case 8. It is accommodated in a state where it protrudes from the case 8.

As mentioned above, the high voltage resistor 12 and the smoothing capacitor 16
An insulating resin 18 that molds the rear side of the high-voltage resistor 12 and the front side of the smoothing capacitor 16 is filled in the resistor case 8 housing the resistor case 8, which is manufactured separately from the main body case 1. Then, with the rear side of the smoothing capacitor 16 facing inside the resistance case mounting part 6, the resistance case 8 is attached to the case mounting part 6.
is fitted, and the rear surface side of the smoothing capacitor 16 is molded with another insulating resin 19 that is injected into the main body case 1 and flows into the resistance case mounting portion 6.

In addition, in the figure, 20 is a focus voltage output line connected to the high voltage resistor 12, and 21 and 22 are the high voltage resistors 12.
This wiring connects the smoothing capacitor 16 and the smoothing capacitor 16.

Although the flyback transformer according to the prior art is constructed as described above, it has the following drawbacks. That is, since the smoothing capacitor 16 is housed in the resistor case 8 in addition to the high-voltage resistor 12, it is not possible to use a standardized resistor case that accommodates only the high-voltage resistor, and a large-sized resistor case must be manufactured separately. There must be. On the other hand, when the resistance case becomes larger,
The resistance case mounting part on the main body case side also has to be made larger, and the anode lead wire extraction position also has to be changed, so the main body case also has to be manufactured separately, which reduces the manufacturing cost of the flyback transformer such as the mold. It will increase. The front side of the smoothing capacitor 16 is molded in advance with one insulating resin 18 filled in the resistor case 8, and the rear side is molded with another insulating resin 19 after being attached to the main body case 1. Since it is molded, the smoothing capacitor 16 may crack due to shrinkage when the other insulating resin 19 is thermoset. Furthermore, smoothing capacitor 1
6 is housed in the resistor case 8 on the rear side of the high voltage resistor 12, facing the high voltage resistor 12. However, since the high voltage resistor 12 is a high heat generating body, the capacitor 16 receives high heat and its temperature increases. This may cause the performance to deteriorate or become short-lived.

[Problem that the invention attempts to solve]

The present invention was devised in view of the above-mentioned drawbacks of the prior art, and the problems to be solved by the present invention are as follows:
Even in flyback transformers that are equipped with a high-voltage resistor and a smoothing capacitor, standardized resistor cases can be used, reducing manufacturing costs and standardizing assembly work. Another object of the present invention is to provide a flyback transformer that can prevent a smoothing capacitor from cracking due to thermal contraction of an insulating resin or from deteriorating its performance due to high heat from a high voltage resistor.

[Means for solving problems]

The means adopted by the present invention to solve the above-mentioned problems consists of a main body case in which two resin inflow holes are formed in the side wall at different positions in the circumferential direction, and a low-voltage coil and a high-voltage coil housed; a resistance case provided on the outside of the body case at a position corresponding to one resin inflow hole of the body case; a high-voltage resistor housed within the resistance case; one insulating resin pre-molded on the rear side of the high voltage resistor; a capacitor case provided on the outside of the main body case at a position corresponding to the other resin inflow hole of the main body case; and a capacitor case formed inside the capacitor case. a smoothing capacitor housed in the capacitor case while being held by the capacitor support; and a smoothing capacitor that is filled from the main body case and passes through each of the resin inflow holes to the resistor case and the capacitor case. The first insulating resin and the other insulating resin for molding the smoothing capacitor together with the low-voltage coil and high-voltage coil are injected into the insulating resin.

[Effect]

With this configuration, the high-voltage resistor is housed in the resistor case, the rear side of the high-voltage resistor is molded in advance with an insulating resin, and the smoothing capacitor is housed in the capacitor case and positioned using the capacitor support. I'll keep it. Then, another insulating resin is injected into the main body case housing the resistance coil and high-voltage coil, and one insulating resin on the rear side of the high-voltage resistor provided in the resistance case is molded through one resin inflow hole. A smoothing capacitor provided in the capacitor case is molded through the other resin inflow hole. This allows the smoothing capacitor to be placed in a location where it is not affected by the heat of the high-voltage resistor, and also prevents the smoothing capacitor from cracking.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to FIG. Note that the same components as those of the prior art described above are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, 31 is a cylindrical main body case made of an insulating material, and the outside of the main case 31 includes an upper frame portion (not shown), a lower frame portion 32A, and left and right frame portions 32B and 32C. A resistor case mounting portion 32 is formed to protrude into a rectangular frame shape, and one resin inflow hole 33 is formed in the peripheral wall of the main body case 31 facing into the resistance case mounting portion 32. has been done.

Reference numeral 34 denotes a resistance case fitted into the resistance case mounting portion 32, and the resistance case 34 has an upper side portion (not shown), a lower side portion 34A, and left and right side portions 34.
B, 34C, and a front part 34D in which the shaft insertion hole 11 is formed, and the resistance case 34
A high voltage resistor 12 is housed inside, and the rear side is covered with an insulating resin 1.
It is a standard product manufactured separately by molding with 8.

Reference numeral 35 denotes a capacitor case that is formed to protrude along the axial direction on the outside of the main case 31 at a position perpendicular to the resistor case 34, and the capacitor case 35 has an upper side surface (not shown) and a left and right side surface. It is formed into a hollow prismatic shape with one end open, consisting of parts 35A, 35B and a front part 35C. Then, the other resin inflow hole 36 is formed in the peripheral wall of the main body case 31 so as to be perpendicularly shifted from one resin inflow hole 33 in the circumferential direction.
5 opens through the resin inflow hole 36.

37 is a capacitor support part provided in the capacitor case 35, and the capacitor support part 37
These are two sets of protrusions 37A, 37A and 37B, 37B formed on the inner surfaces of the left and right side portions 35A, 35B so as to be spaced apart from each other by a predetermined distance and facing each other in the longitudinal direction. Reference numeral 38 denotes a smoothing capacitor formed into a substantially convex planar shape with a step on one side. The smoothing capacitor 38 is inserted into the capacitor case 35 from the opening side, and its front and rear surfaces are held between the capacitor support parts 37. By doing so, it is held within the capacitor case 35, and the upper and lower positions form a gap through which another insulating resin 19 injected through the other resin inflow hole 36 can flow. And the smoothing capacitor 3
8 is injected into the main body case 31, and the whole is molded with an insulating resin 19 that flows into the capacitor case 35 and hardens.

According to this embodiment configured as described above, the resistor case 34 can be of a standard that accommodates only a high-voltage resistor, and only the main body case 31 can be modified to accommodate a smoothing capacitor. The main body case 31 and the resistor case 34 are enough.
It is possible to reduce the manufacturing cost of the flyback transformer without having to change both of the above, and it is possible to standardize the manufacturing process and improve work efficiency.

Further, according to this embodiment, the smoothing capacitor 38
Since the whole is molded with one type of insulating resin 19, it is possible to reliably prevent the smoothing capacitor 38 from cracking due to shrinkage when the insulating resin 19 is thermoset. can.
Furthermore, according to this embodiment, the capacitor case 3
5 is provided with a capacitor support portion 37 to hold the smoothing capacitor 38 in a positioned state, so that the capacitor 38 does not move when injecting the insulating resin 19 through the resin inflow hole 36. This allows the capacitor case 35 to be held in the correct position, thereby preventing accidents such as hitting the inner wall of the capacitor case 35 and breaking it.

In this embodiment, the capacitor support portion 37 has two sets of protrusions 37A, 37A and 37B, 37B.
Although it has been described that each protrusion 37
In place of A and 38A, one or more sets of holding claws for holding the smoothing capacitor 38 may be provided inside the capacitor case 35. In addition, the capacitor case 35 is molded separately from the main case 31, and the main case 35 is molded separately from the main case 31.
1 may be fitted. Furthermore, although it has been described that the resistor case 34 and the capacitor case 35 are disposed in the main body case 31 with their positions shifted by 90 degrees, the present invention is not particularly limited to this position.

[Effect of idea]

According to the present invention configured as detailed above,
The following effects are achieved.

Since the resistor case and capacitor case are installed at different positions in the circumferential direction with respect to the main body case, a standardized resistor case is used, and a high voltage resistor is installed inside the resistor case, and the high voltage resistor is installed on the back side of the resistor case. Since the same insulating resin can be molded in advance and only the design of the main body case needs to be changed, the manufacturing cost of the flyback transformer can be reduced, and the manufacturing process can be standardized and work efficiency can be improved. I can do it.

The smoothing capacitor is housed in a capacitor case, and the front surface is molded with one type of insulating resin filled in the main body case. can reliably prevent cracking.

The resistor case and capacitor case are provided separately, and the smoothing capacitor is installed independently and separately from the high voltage resistor, which is a high heat generating element.
Smoothing capacitors can be operated under stable temperature conditions.

The smoothing capacitor is molded around its entire circumference with another insulating resin while being supported by the capacitor support, so the smoothing capacitor does not move when resin is injected and can be held in the correct position. This can prevent accidents such as hitting the inner wall of the building and breaking it.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a flyback transformer according to an embodiment of the present invention, FIGS. 2 and 3 show the prior art, FIG. 2 is a cross-sectional view of the flyback transformer, and FIG. 3 is a cross-sectional view of the flyback transformer. 2 is a sectional view taken in the direction of the - arrow in FIG. 2. FIG. 4...Low voltage coil, 5...High voltage coil, 12...
...High voltage resistance, 18,19...Insulating resin, 31...
Main body case, 33, 36...Resin inflow hole, 34...
...Resistor case, 35...Capacitor case, 37
... Capacitor support part, 38 ... Smoothing capacitor.

Claims (1)

[Scope of utility model registration request] A main body case in which two resin inflow holes are formed at different positions in the circumferential direction on a side wall, a low voltage coil and a high voltage coil housed in the main body case, and a resin inflow hole in one of the main body cases corresponds to the main case. A resistor case provided outside the main body case at a position, a high voltage resistor housed in the resistor case, one insulating resin for pre-molding the rear side of the high voltage resistor, and the other resin of the main body case. a capacitor case provided on the outside of the main case at a position corresponding to the inflow hole; a capacitor support portion formed inside the capacitor case;
The smoothing capacitor is housed in the capacitor case while being held by the capacitor support, and the low voltage A flyback transformer comprising a coil, a high-voltage coil, the above-mentioned insulating resin, and another insulating resin in which a smoothing capacitor is molded.