JPH01205406A - Fly back transformer - Google Patents

Abstract

PURPOSE:To contrive both simplification of a wiring work and economy of wiring material by a method wherein the electric circuit parts such as a high tension stabilizing circuit and the like are integrally formed with a fly back transformer. CONSTITUTION:The assembling of a fly back transformer is conducted by forming a coil body 7 in the first place by fitting a high-tension coil 10 outside a low tension coil 8, and in the above-mentioned state, the wire-connection with an electric circuit is conducted utilizing a connection part 19. Then, the inserting tip part of the low tension bobbin 11 of the coil body 7 is airtightly fitted into the fitting wall 5 of a inserting hole part 4, and a cylindrical container body is formed. When casting resin 21 is poured as high as the level H, which is the proxinity position of a wire-connection groove 12, with the open end of a coil case 1 up, the coil body 7 is buried in the casting resin 21 and fixed. Then, the leg parts 13a and 14a of cores 13 and 14 are inserted into the center hole of the low-tension bobbin 11 from both sides, they are butt together and in this state, fitted into a groove 9 astride a metal fitting 15. In spite of the fact that the circuit-formed body is integrally formed with the case 1 as above-mentioned, the circuit-formation body can be arranged on the so-called dead zone of the coil case 1, and the title fly back transformer can be made small in size.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a flyback lance that boosts a flyback pulse generated by a horizontal deflection output circuit and applies it to the anode of a cathode ray tube. It concerns the mechanical structure of the transformer.

[Prior Art] As is well known, a flyback transformer is disposed in a high voltage generator that drives a cathode ray tube in a television receiver or a CRT display. This type of flyback transformer has a coil body in which a low-voltage coil and a high-voltage coil are wound around a core, and is housed in a coil case, and the coil case is usually filled with insulating casting resin. The coil body is fixed by the casting resin.

[Problem to be solved by the invention]

In recent years, electric circuits such as high voltage output voltage stabilization circuits and safety circuits for detecting rare shorts in fly hack transformers have been formed on the circuit boards of television receivers and CRT display drive circuits. A flyback transformer and the electric circuit, which are arranged at a remote position with respect to the circuit board, are connected using a wiring material.

However, if the electric circuit and the flyback transformer are provided apart from each other, the wiring work for both becomes complicated, and the amount of wiring material used is also disadvantageous.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to form electric circuit parts such as high-voltage stabilizing circuits integrally with a flyback transformer, thereby facilitating wiring work and reducing the need for wiring materials. A small flyback that can save you money
- To provide a lance.

[Failure to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a cylindrical coil case that is open at one end and has an end wall having an insertion hole at the other end, and a coil case in which one end of the coil case is hermetically fitted into the insertion hole. A low-voltage coil housed in a case, a high-voltage coil wound around the outside of the low-voltage coil and housed in the coil case, and a leg part that is inserted into the insertion hole of the coil case and the center hole of the low-voltage coil. A core disposed in an inserted state, a circuit forming body in which an electric circuit is formed, and a holding portion for the circuit forming body integrally formed with the outer peripheral wall of the coil case. a wire connection groove is formed in the open end of the coil case, and
One end of the circuit forming body held by the holding portion is inserted through this connection groove and extended to a position near and opposite to both the low voltage and high voltage coils, and the extended portion of the circuit forming body is connected to these low voltage and high voltage coils. The connection between both coils and the electric circuit of the circuit forming body is formed, and the coil case is filled with insulating molded resin, and the low voltage coil and high voltage coil are connected to this molded resin. The structure is characterized by being buried and fixed in the interior.

(Operation) In the present invention configured as described in item 1, when the high voltage coil is fitted outside the low voltage coil, the electric circuit of the circuit forming body and both coils are connected.

After this connection is completed, both coils are inserted into the coil case, and the bobbin of the low-voltage coil is hermetically fitted into the insertion hole of the coil case, so that the coil case becomes an annular container with one end closed. On the other hand, the circuit forming body is held by a holding part provided on the outer periphery of the coil case.

After this circuit forming body is held and both coils are housed in the coil case, a casting resin is injected into the coil case which is an annular container body, and both coils are filled with the casting resin. It becomes buried and fixed. In this manner, the fly hack transformer of the present invention is compact and integrally formed with both the low voltage and high voltage coils and the circuit forming body integrated into a unit.

-4 = (Example) Hereinafter, an example of the present invention will be described based on the drawings.
A first embodiment of a fly hack transformer according to the present invention is shown in the figures and in FIG.

In FIG. 1, a coil case 1 is formed into a cylindrical shape by a cylindrical wall 2 and an end wall 3 provided at one end of the cylindrical wall 2, and an insertion hole 4 is formed in the center of the end wall 3. It is formed. The insertion hole portion 4 includes a fitting wall 5 formed by bending the center portion of the end wall inward, and an insertion hole 6 formed by opening the end surface of the fitting wall 5. A coil body 7 is housed in the coil case 1.

This coil body 7 has a high voltage coil 10 on the outside of the low voltage coil 8.
are fitted together. Low pressure coil 8 is low pressure bobbin 1■
The high-voltage coil 1° is formed by winding the winding wire in sections around the outer circumference of the high-voltage bobbin 290 winding drum.

When the coil body 7 is housed in the coil case 1, one end of the low-pressure pobbin 11 is hermetically fitted into the fitting wall 5 of the insertion hole 4, and by this fitting, the inside of the coil case 1 is closed. It is isolated from the outside by the cylindrical wall 2, the end wall 3, and the peripheral wall of the low-pressure bobbin 11. That is, the coil case J becomes an annular container body by fitting the low pressure bobbin 11 thereinto.

In this case, if the above-mentioned airtight isolation cannot be achieved simply by directly fitting the fitting wall 5 and the low pressure bobbin 1, a gasket may be interposed between the two, or a gasket may be interposed between the two. The inside of the coil case 1 is hermetically isolated from the outside by, for example, sealing the fitting portion of .11 with an adhesive or the like.

On the other hand, a connection groove 12 is provided in the cylindrical wall 2 on the open end side of the coil case 1. The depth h of this wire connection groove 12 is set to be closer to the front side (open end side) than the collar position of the low pressure bobbin 11. In addition, the center hole of the low pressure bobbin 11 has two U-shaped cores 13°, 14 legs], 3a, 1.
4a are inserted so that they are butted against each other. A groove 9 is formed in the end face of this core 13.14 (FIG. 2), and a metal fitting 15 having spring elasticity is fitted into the groove 9 so as to straddle the core 13.14. are integrally connected. When these cores 13 and 14 are installed, the bottom portion 16 of the core 14 is fitted into the wire connection groove 12, so that the bottom surface of the bottom portion 1G does not protrude from the open end surface of the coil case 1.

Further, on the outer peripheral wall of the coil case 1, case-shaped holding portions 17a and 17b protruding from both sides of the leg portions 13b and 14b of the core 13.14 are integrally formed by, for example, injection molding. Circuit forming bodies 18a and 18b are held in parts 17a and 17b. These circuit forming bodies 18a and 18b are formed with appropriate electric circuits such as high-voltage stabilizing circuits, and various forms such as hybrid ICs and monolithic ICs can be considered, but in this embodiment, a printed circuit board is used. The circuit forming body 18a, 1
8b.

Holding part 17a,
As the means for holding on the holding part 17b, for example, the holding part 17a,
A slide groove is provided in 17b, and the pudding 1 is inserted into this slide groove.
A type in which one board 18a, 18b is fitted and fixed, or a holding part 17a, 17b and a printed circuit board 18
A and 18b have a concave part on the blade side and a convex part on the other side, and fix by elastic fitting of the convex part and the four parts, and various other methods are possible. An appropriate holding means will be selected depending on the specifications.

Further, a puncture holding portion (see FIG. 3) for holding a focus pack 32 (FIG. 3) is provided at an arbitrary position on the outer circumferential wall of the coil case 1.
(not shown) is similarly integrally formed, and the circuit board 18a
, 18b, the focus pack 32 is held in its pack holding portion.

By the way, the wiring groove 1 of the printed circuit boards 18a and 18b
An extension part 2o is provided at the end of the second side to protrude through the connection groove 12 and face both the low voltage and high voltage coils 8, 10,
A connecting portion 19 is formed in this extension portion 20 to connect the electric circuit of the printed circuit boards 18a, 18b to both the low voltage and high voltage coils 8.10.

With the coil body 7 housed in the coil case 1,
The coil case 1 is filled with an insulating molding resin 21, and the coil body 7 is fixed in the molding resin 21 in a −9=embedded state.

Note that 22 in the figure indicates a terminal pin for connecting the flybank transformer to other circuits.

The embodiment of the bookcase 1 is configured as described above, and the following:
An example of how to assemble the fly eight transformer will be explained.

First, the high voltage coil 10 is fitted on the outside of the low voltage coil 8 to form the coil body 7. In this state, connection between both the low-voltage and high-voltage coils 8 and 10 and the electric circuit formed on the printed circuit board 18 is performed using the connecting portion 19. Necessary circuit connections at the periphery of the coils 8 and 10, for example,
As shown in FIG. 1, the connection between the high voltage rectifier diode 23 and the high voltage coil 1o is also made at the same time.

After the connection work is completed, the coil body 7 is housed in the coil case 1, and the printed circuit boards 18a, 18b are attached to the corresponding holding parts 17a, 17b. When housing the coil body 7, the insertion tip of the low-pressure bobbin 11 is hermetically fitted into the fitting wall 5 of the insertion hole 4.

Due to this airtight fitting, the inside of the coil case 1 is = 1
0- As mentioned above, it becomes a cylindrical container body, and the coil case 1
If the molded resin 21 is poured into the molded resin 21 with the open end facing upward, the coil body 7 will be buried in the molded resin 21, and in this buried state, the coil body 7 will be buried in the molded resin 21. The body 7 is fixed within the coil case 1. After the casting resin 21 is solidified, the leg portions 13a and 14 of the cores 13 and 14 are
a into the center hole of the low-pressure bobbin 11 from both sides, butt each leg 13a, 13b against the same 14a, 14b, and in this state, fit the metal fitting 15 into the socket 9, straddling both cores 13 and 14. By inserting the cores 13, 1.4 together, a flyback lance (not shown in FIG. 1) is assembled.

FIG. 3 shows a high voltage generating circuit used in CRT displays and television receivers. This circuit is
It consists of a horizontal output deflection circuit 25, a focus circuit 24, a high-voltage stabilization circuit 26, a CRT cathode ray tube 27, and a booster section 28 for the flybank 1 to lance. Stabilization circuit 26
are integrated into the coil case l, and furthermore, the portion of the high voltage stabilizing circuit 26 excluding the addition voltage generating coil 30 and the standard voltage generating coil 31 from the high voltage stabilizing circuit 26 is integrated into the printed circuit board 18a. , 18b (although not shown in FIG. 1, the addition voltage generating coil 30 and the reference voltage generating coil 31 are usually formed in the leg portions 13a, 18b).
14a side). And focus circuit 2
The focus back 32 is made into a pack using a plastic frame body, and is detachably attached to a bank holding portion provided on the outer peripheral surface of the coil case 1 by the same appropriate means as the printed circuit boards 18a and 18b. .

In this high voltage generation circuit, a voltage drop in the high voltage output voltage E11 applied to the CRT cathode ray tube 27 is detected by the variable resistor 1R1 of the focus circuit 24, and this detected voltage is applied to the high voltage stabilizing circuit 26. The high-voltage stabilizing circuit 26 compares the reference voltage of the sawtooth wave produced by the integrating circuit 33 with the detected voltage, and outputs a high-voltage output voltage E.
A rectangular wave signal having a width corresponding to the drop of II is applied to the drive transistor 34.

Then, based on the operation of the drive transistor 34, the control 1 to transistor 35 opens the G gate for a time corresponding to the pulse width of the rectangular wave, and transfers the addition voltage generated by the addition voltage generation coil 30 to the multiplier circuit 3G. Add. The multiplier circuit 36 doubles the added voltage sent through the gate of the control 1 transistor 35 and sends it to the high voltage coil 10.
Add to.

Therefore, according to this high voltage generating circuit, the voltage corresponding to the drop in the high voltage output voltage is compensated by the high voltage stabilizing circuit 26, and the high voltage output voltage Eu is stabilized.

In the circuit shown in the third section, in order to connect the booster section 2B and the high voltage stabilizing circuit 26, a total of six connection lead wires are required, corresponding to the terminal sections P1 to P6. in this case,
When forming the high voltage stabilizing circuit 26 on the television set board separately from the flyback transformer as in the conventional example,
Normally, a lead wire with a connector is used for connection, which increases costs. On the other hand, as shown in this embodiment, if the high voltage stabilizing circuit 2G is formed integrally with the flyback transformer, these lead wires with connectors are unnecessary, and the cost I can be significantly reduced.

Further, according to the embodiment of Section 1, the printed circuit board 18a,
18b are arranged on both sides of the legs 13b, 14b of the core 13.14. Both sides of the legs 13b and 14b are originally areas that cannot be used effectively as dead zones, and printed circuit boards 18a and 18b are placed in these dead zones.
By setting &j, the Punto zone can be used effectively, and even if the printed circuit boards 18a and 18b are installed, the size of the fly hack transformer does not increase.
The advantage is that the area occupied by a printed circuit board in a television set or the like can be reduced.

Furthermore, since the extended portion 2o of the printed circuit board and both the low-voltage and high-voltage coils 8.10 are arranged close to each other, the high-voltage stabilizing circuit 26 and both the coils 8, 1o can be connected over the shortest distance. As a result, connection wiring materials can be saved, and since these connections can be made before installing the coil body 7 in the coil case, there is no need to insert a connection tool into a narrow place, making it extremely easy to use. The connection work can be easily performed.

Furthermore, when the casting resin 21 is injected into the coil case 1, the casting resin 21 does not leak out from the coil case 1, so the printed circuit board 18a.

It becomes easy to fix the coil body 7 without contacting the casting resin 21 with the electric circuit 18b.

FIG. 4 shows the second part of the flyback 1 Herans according to the present invention.
In this embodiment, the same parts as in the first embodiment are designated by the same reference numerals. This second embodiment differs from the first embodiment in that a holding portion 17 is formed on one side of the core leg portions 13b and 14b protruding from the coil case 1, and high voltage is applied to one pudding 1 to the substrate. An electric circuit such as a stabilizing circuit 26 is formed. In this second embodiment, if the focus pack 32 is placed on the opposite side of the printed circuit board 18 with the legs 13b and 14b in between, both the printed circuit board 18 and the focus pack 32 are placed in a so-called dead zone. Therefore, it becomes possible to effectively utilize the deno zone. This second embodiment also makes it possible to obtain the same effects as the first embodiment.

The present invention is not limited to the first and second embodiments, and can be implemented in various ways.

For example, in each of the above embodiments, the printer 1 - the board 1B, 1
Although a high voltage stabilizing circuit 26 is formed at 8a and 18b, it is also possible to form other types of circuits.

In each of the above embodiments, if it is necessary to make a hole in the cylindrical wall of the coil case 1 and take out the lead wire from this hole, a gasket or the like is interposed between the wall of the hole and the lead wire.
The lead wire is taken out from the hole of the coil case 1 while maintaining airtightness inside the coil case 1 so that the molding resin 21 does not leak.

〔Effect of the invention〕

Since the present invention is constructed as described above, even though the circuit forming body is integrally formed in the coil case, it is possible to arrange the circuit forming body in the so-called Punto zone of the coil case. This makes it possible to provide a small-sized integrated fly-handling lance.

In addition, since the extended portion of the circuit forming body is extended to a position near both the low-voltage and high-voltage coils, these two coils and the electric circuit of the circuit forming body can be connected with a short cotton wire. It is possible to save money. Moreover, while the connection between these two coils and the electric circuit of the circuit forming body can be made at the time of assembling the flyback transformer,
The wiring work is also very easy, and the efficiency of the assembly work can be greatly improved.

Furthermore, although the coil case becomes a cylindrical container body by incorporating a low-voltage coil, even if casting resin is injected into this coil case, this will not leak outside, and therefore the electric circuit of the circuit forming body This makes it easy to separate the molding resin from the molding resin.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the flyback lance according to the present invention (A-A sectional view of Fig. 2), Fig. 2 is a plan view showing the flyback lance, and Fig. 3 is a plan view of the flyback lance of the same embodiment. FIG. 4 is a circuit diagram of a high voltage generation circuit including an electric circuit portion formed in a circuit forming body, and FIG. 4 is a perspective view showing a second embodiment of a flyback transformer according to the present invention. ■...Coil case, 2...Cylinder wall, 3...End wall,
4... Insertion hole portion, 5... Fitting wall, 6... Insertion hole,
7... Coil body, 8... Low voltage coil, 9... Groove,
IO...High voltage coil, 11...Low pressure bobbin, 12...
... Connection groove, 13.14 ... Core, 13a, 13b,
14a, 14b-legs, 15... metal fittings, 16...
Bottom, 17, 17a, 17b-holding part, 18.18a
, 18t+- printed circuit board (circuit forming body), 19...
・Connection part, 20... Extension part, 21... Casting resin, 2
2...Terminal pin, 23...High voltage rectifier diode, 2
4... Focus circuit, 25... Horizontal output deflection circuit, 26... High voltage stabilization circuit, 27... CRT cathode ray tube, 28... Boosting section, 29... High voltage bobbin, 30
...Additional voltage generation coil, 31...Reference voltage generation coil, 32...Focus pack, 33...Integrator circuit, 34...Drive transistor, 35...Control transistor, 36...Multiple Voltage doubler circuit.

Claims (1)

[Claims] A cylindrical coil case that is open at one end and has an end wall having an insertion hole at the other end, and one end of a coil bobbin is hermetically fitted into the insertion hole and housed in the coil case. A low voltage coil, a high voltage coil wound around the outside of the low voltage coil and housed in a coil case,
A core whose legs are inserted through the insertion holes of the coil case and the center hole of the low-voltage coil, a circuit forming body in which an electric circuit is formed, and the coil on the outer peripheral wall of the coil case. a holding part for the circuit forming body formed integrally with the case, a wiring groove being formed in the open end of the coil case, and one end of the circuit forming body held by the holding part. The section is inserted through this connection groove and extended to a position near and opposite to both the low-voltage and high-voltage coils, and the extended section of the circuit-forming body has a connection between the low-voltage and high-voltage coils and the electric circuit of the circuit-forming body. The flyback is characterized in that the coil case is filled with insulating casting resin, and the low-voltage coil and high-voltage coil are embedded and fixed in the casting resin. Trance.