JPH0883725A - Flyback transformer - Google Patents

Abstract

PURPOSE: To enable the ends of both the lateral ferrite cores of a flyback transformer to protrude less from a board so as to make the center of gravity of the flyback transformer located close to the board by a method wherein input/ output terminals are provided protruding vertical to the axial direction of a bobbin from both ends of a low-voltage bobbin and extending sideward from the upper and lower side of a case body. CONSTITUTION: Cylindrical low-voltage bobbins 12 wound with low-voltage windings 18 and 22 are inserted into a cylindrical high-voltage bobbin 23 wound with a high-voltage winding 29, and the windings 18 and 22 wound on the low- voltage bobbins 12 are connected to input/output terminals 17 and 21 respectively. The input/output terminals 17 and 21 are provided protruding vertical to the axial direction of the bobbin 12 from both ends of the low-voltage bobbin 12 and extending sidewards from the upper and lower side of a case 2. By this setup, the ferrite cores 8 and 10 accounting for most weight of the flyback transformer 1 protrude less from a board, so that the center of gravity of the flyback transformer is positioned close to the board, and the tip of the flyback transformer is restrained from coming into contact with other electronic parts.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel flyback transformer. More specifically, it is an object of the present invention to provide a novel flyback transformer that can be mounted on a substrate that extends in the vertical direction while reducing the amount of protrusion from the substrate.

[0002]

2. Description of the Related Art FIGS. 4 to 5 show an example a of a conventional flyback transformer.

Reference numeral b denotes a case body of the flyback transformer, which is formed in a box shape elongated in the vertical direction, an insertion hole c is formed in the center of the upper surface plate, and an engaging notch d is formed below the side surface plate. ing.

Reference numeral e denotes an anode cap, which is formed of a material such as silicon rubber and has a suction cup shape, is supported by one end of a high voltage lead wire f fixed to the upper surface plate of the case body b, and is not shown in the television. It is adsorbed to the cone portion of a picture tube such as a picture receiver.

G is one ferrite core and g'is the other ferrite core, both of which are U-shaped.

The above-mentioned one ferrite core g is
One end is inserted into an insertion hole c formed in the upper surface plate so as to be hooked on the case body b, and the other ferrite core g ′ is partially in an engagement notch d formed in the side surface plate of the case body b. Are engaged and one end is inserted into the case body b.

The other end portions of the one ferrite core g and the other ferrite core g'abut on the outside of the case body b and one end portion of the one ferrite core g inserted inside the case body b. One end of the other ferrite core g ′ is brought into contact with the inside of the case body b (not shown).

With one ferrite core g and the other ferrite core g'in contact with each other at one end and the other end, respectively, one ferrite core g and the other ferrite core g ' Both the ferrite cores g and g'are fixed to the case body b in a substantially O shape by fitting the fastening metal fitting h into the groove formed along the outer circumference.

Are input / output terminals axially projected from the low-pressure bobbin, and from the lower surface of the case body b,
It projects outside the case body b.

Reference numeral j denotes a substrate, to which the input / output terminals i, i, ... Protruding from below the case body b are fixed by an appropriate means such as soldering.

[0011]

However, in the conventional flyback transformer a, the input / output terminals i, i, ... Protruding downward from the case body b are printed on the substrate by appropriate means such as soldering. Since it is fixed to j, the projecting distance of both ferrite cores g and g ′, which occupy most of the weight of the flyback transformer a, from the substrate j becomes large, and as a result, the position of the center of gravity of the flyback transformer a from the substrate j. It will be far away.

Therefore, when the board j is mounted on the board j of the television receiver in a direction other than the horizontal direction, that is, in the vertical direction as shown in FIG.
There is a problem in that the tip of the flyback transformer a falls in the direction of the arrow and comes into contact with other electronic components or the like, which may cause a failure, etc.

There is also a problem that the moment in the direction of the arrow causes a large stress on the input / output terminals i, i, ... And the substrate j, which may cause disconnection or the like.

When the flyback transformer a is placed on the substrate j, it greatly projects from the substrate j.
This limits the design flexibility of the mounting position.

Therefore, in order to improve the above problems, the one a'shown in FIGS. 6 and 7 can be considered.

In the flyback transformer a ',
The same parts as those of the conventional flyback transformer a are designated by the same reference numerals as those of the flyback transformer a, and the description thereof will be omitted.

Reference numeral k denotes a flat insertion notch formed below the side plate of the case body b, and is orthogonal to the side plate having the engagement notch d into which the other ferrite core g'is fitted. It is formed at the lower end of the side plate.

.. are input / output terminals, which are inserted into the lower end portion of the low-pressure bobbin (not shown) and projected in the direction orthogonal to the axial direction of the low-pressure bobbin and formed in the case body b. With the notch k inserted, it projects outside the case body b.

Reference numeral m denotes an auxiliary projection integrally formed on the upper end of the side plate having the insertion notch k of the case body b, and is projected in the same direction as the input / output terminals 1, 1 ,. There is.

Then, the input / output terminals 1, 1, ... That are projected from the case body b of the flyback transformer a ′ are fixed to the board j by appropriate means such as soldering, and the case of the flyback transformer a ′ is provided. The flyback transformer a ′ and the substrate j are kept parallel to each other by the auxiliary protrusion m provided on the body b coming into contact with the substrate j.

If the input / output terminals 1, 1, ... Are projected laterally of the case body b like the flyback transformer a ', both of which occupy most of the weight of the flyback transformer a'. The protrusion distance of the ferrite cores g and g ′ from the substrate j is reduced, and as a result, the position of the center of gravity of the flyback transformer a ′ can be brought closer to the substrate j.

Further, since the protruding amount of the case body b from the substrate j can be reduced, the degree of freedom in designing the mounting position can be increased.

However, in the flyback transformer a ', the input / output terminals l,
There is a problem that the number of l, ... May be less than the required number.

If the input / output terminals 1, 1, ... Are fixed to the board j by appropriate means such as soldering, only the input / output terminals 1, 1 ,. Since it is fixed, as shown in FIG. 7, when it is fixed to the vertically extending board j, a moment to tilt in the direction of the arrow acts, and the input / output terminals 1, 1, ...
There is a problem that a large amount of stress is applied to the wire and it causes a disconnection.

The flyback transformer a shown in FIG.
There is also a method of mounting by reversing the top and bottom of ´, but in that case also, since the number of input / output terminals l, 1, ... Is small, the force applied to each input / output terminal 1, 1 ,. Becomes
There is a problem that a large stress is applied to the input / output terminals 1, 1, ...

[0026]

In order to solve the above-mentioned problems, the flyback transformer of the present invention is provided with an input / output terminal projecting from both ends of a low voltage bobbin in a direction orthogonal to the axial direction. It is designed to project laterally from both upper and lower sides.

[0027]

Therefore, according to the flyback transformer of the present invention, since it is fixed to the substrate by the input / output terminals protruding laterally from both the upper and lower sides of the case body, the two ferrite cores that occupy most of the weight of the flyback transformer are used. The protrusion distance from the substrate is reduced, and the position of the center of gravity of the flyback transformer can be brought closer to the substrate.

Therefore, even when the flyback transformer is fixed to the substrate extending in the vertical direction, the tip of the flyback transformer is not lowered and is not in contact with other electronic components.

Further, since the input / output terminals are provided on both the upper and lower sides, the number of the input / output terminals may not be less than the required number, and the advantage that the force applied to each of the input / output terminals is dispersed can be obtained. Have.

Since the amount of protrusion of the case body from the substrate when mounted on the substrate can be reduced,
It is possible to mount the case body on a substrate extending in the vertical direction.

Further, the fact that the case body can be mounted on the substrate extending in the vertical direction expands the degree of freedom in designing the mounting position, and contributes to the higher density and smaller size which have been desired in recent years. can do.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the flyback transformer of the present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 is a flyback transformer. Reference numeral 2 denotes a case body, which has a top plate 3 and a bottom plate 4 formed in a substantially L shape, and has a box shape having an opening 5 toward one side.

Reference numeral 6 denotes an anode cap, which is made of a material such as silicon rubber in a suction cup shape, is supported by one end of a high voltage lead wire 7 fixed to a corner of the upper plate 3 of the case body 2, and receives a television image (not shown). It is adsorbed to the cone portion of a picture tube such as a container.

Reference numeral 8 denotes one ferrite core, which has a shape in which a prism is bent into a U shape, and one end of which is a cylindrical portion 9,
A fitting groove 8a is formed on the outer side surface.

Reference numeral 10 denotes the other ferrite core, which has the same shape as the one ferrite core 8 and has a cylindrical portion 11 at one end and a fitting groove 10a on the outer surface.

A low pressure bobbin 12 is composed of an upper side low pressure bobbin half 13 and a lower side low pressure bobbin half 14.

The upper low-pressure bobbin half 13 is composed of a terminal supporting portion 15 and a bobbin portion 16 vertically extending from the center of the terminal supporting portion 15.

A fitting groove 15a for fitting one ferrite core 8 is formed on the upper surface of the terminal support portion 15,
An insertion hole 16a for inserting the cylindrical portion 9 of one ferrite core 8 is axially penetrated through the bobbin portion 16, and the insertion hole 16a is opened in the fitting groove 15a of the terminal support portion 15.

Then, from the terminal supporting portion 15 to the input / output terminal 1
, 17, and so on, the input / output terminals 17, 1
7, ... and low-voltage windings 18 and 1 wound around the bobbin portion 16.
, ... Are connected by appropriate means.

The lower low-pressure bobbin half 14 is composed of a terminal supporting portion 19 and a bobbin portion 20 which is provided upright from the center of the terminal supporting portion 19.

A fitting groove 19a for supporting the other ferrite core 10 is formed on the lower surface of the terminal support portion 19,
The bobbin portion 20 has a cylindrical portion 1 of the other ferrite core 10.
The insertion hole 20a for inserting 1 is penetrated in the axial direction,
The insertion hole 20a is opened in the fitting groove 19a of the terminal support portion 19.

Numerals 20b and 20b are fitting pieces projecting upward from the inner surface of the insertion hole 20a at the upper end of the bobbin portion 20, and are fitted into the insertion hole 16a of the upper low pressure bobbin half 13 when the flyback transformer 1 is assembled. By being combined, the upper low-pressure bobbin half 13 and the lower low-pressure bobbin half 14 are connected to each other at their tips.

Then, from the terminal supporting portion 19 to the input / output terminal 2
, 21, and so on, the input / output terminals 21, 2 ...
1, ... and low-voltage windings 22, 2 wound around the bobbin portion 20.
2, ... Are connected by appropriate means.

Reference numeral 23 denotes a high-pressure bobbin, which is a cylindrical main portion 2
4 and flanges 25, 2 on the upper and lower ends of the main portion 24, respectively.
6 is integrally formed.

.. project from the flange 25 at the upper end of the high-pressure bobbin 23 toward the side, and support pieces 28, 28 ,.・ ・ Is projected.

The central hole 24a of the main portion 24 of the high pressure bobbin 23
The bobbin portion 16 of the upper low-pressure bobbin half 13 and the bobbin portion 20 of the lower low-pressure bobbin half 14 are fitted into the respective parts.

Reference numeral 29 is a high-voltage winding wound around the outer peripheral surface of the main portion 24 of the high-voltage bobbin 23.

The support pieces 27, 2 formed on the flanges 25, 25, ... Of the high-pressure bobbin 23.
, And the supporting pieces 28, 28, ... Formed on the flanges 26, 26, ..., Each of which is a diode supported by the main portion 24 of the high-voltage bobbin 23. Connected to the high voltage winding 29.

Next, the assembly of the flyback transformer 1 will be described.

The bobbin portion 16 of the upper low pressure bobbin half 13 and the bobbin portion 20 of the lower low pressure bobbin half 14 are fitted into the center hole 24a of the high pressure bobbin 23 from above and below. At that time, the fitting pieces 20b, 2 formed on the upper end of the bobbin portion 20.
0b is fitted in the insertion hole 16a of the bobbin portion 16.

Then, the cylindrical portion 9 of one ferrite core 8 is inserted into the insertion hole 16a of the upper low-pressure bobbin half 13 from above, and part of the ferrite core 8 is fitted into the fitting groove 15a of the terminal support portion 15. Are combined.

The column portion 11 of the other ferrite core 10 is inserted into the insertion hole 20a of the lower low-pressure bobbin half 14 from below, and part of the ferrite core 10 is inserted into the fitting groove 19a of the terminal support portion 19. Mated.

Then, the fastening metal fitting 31 is fitted into the fitting groove 8a of the one ferrite core 8 and the fitting groove 10a of the other ferrite core 10, whereby the one ferrite core 8 and the other ferrite core 10 are connected. The positional relationship among the upper side low pressure bobbin half 13, the lower side low pressure bobbin half 14 and the high pressure bobbin 23 is fixed.

The upper surface of the input / output terminal supporting portion 15 of the upper low-voltage bobbin half 13 and the upper surface of the upper plate 3 of the case body 2 are flush with each other, and The low-pressure bobbin 12 is fixed to the case body 2 so that the bottom surface and the bottom surface of the bottom plate 4 of the case body 2 are flush with each other.

Then, the low-pressure bobbin 12 and the high-voltage bobbin 23 are held in the case body 2 by pouring the insulating material 32 into the case body 2, and the flyback transformer 1 is completed.

When fixed to the board 33, as shown in FIG. 3, the input / output terminals 17, 17, ... And the input / output terminals 21, 21 ,. It is fixed to 33.

As is apparent from the above, in the flyback transformer 1 of the present invention, when the flyback transformer 1 is fixed to the substrate 33, the input / output terminals 17, 17, ... .. and input / output terminals 21, 21, ...
Since the and are fixed to the substrate 33, the mounting is reliable.

The input / output terminals 17, 17, ... And the input / output terminals 21, 21, ... Are provided so as to project from the upper and lower ends of the low-voltage bobbin 12, thereby ensuring a sufficient number of input / output terminals. can do.

Further, by fixing the side surface of the case body 2 to the substrate 33, the amount of protrusion of the case body 2 from the substrate 33 can be reduced.

[0061]

As is apparent from the above description, in the flyback transformer of the present invention, the cylindrical low pressure bobbin having the low voltage winding wound on the cylindrical high voltage bobbin wound with the high voltage winding is inserted. A flyback transformer that is provided and connects a low-voltage winding wound around a low-voltage bobbin and an input / output terminal, and holds the high-voltage bobbin and the low-voltage bobbin in a case body, wherein the input / output terminal is a low-voltage bobbin. It is characterized in that the case body is provided so as to project in a direction orthogonal to the axial direction so as to project laterally from both upper and lower sides of the case body.

Therefore, according to the flyback transformer of the present invention, since it is fixed to the substrate by the input / output terminals projecting laterally from both the upper and lower sides of the case body, the two ferrite cores that occupy most of the weight of the flyback transformer are used. The protrusion distance from the substrate is reduced, and the position of the center of gravity of the flyback transformer can be brought closer to the substrate.

Therefore, even when the flyback transformer is fixed to the substrate extending in the vertical direction, the tip of the flyback transformer is not lowered and is not in contact with other electronic components.

Further, since the input / output terminals are provided on the upper and lower sides, the number of the input / output terminals is not less than the required number, and the advantage that the force applied to each input / output terminal is dispersed is obtained. Have.

Since the amount of protrusion of the case body from the substrate when mounted on the substrate can be reduced,
The case body can be mounted on the vertical substrate.

Further, the fact that the case body can be mounted on the vertical substrate expands the degree of freedom in designing the mounting position, and contributes to the higher density and smaller size which have been desired in recent years. it can.

It should be noted that the specific shapes and structures shown in the above-mentioned embodiments are merely examples of the implementation in implementing the flyback transformer of the present invention, and the technical scope of the present invention shall be considered accordingly. Is not limitedly interpreted.

[Brief description of drawings]

FIG. 1 shows an embodiment of a flyback transformer of the present invention together with FIGS. 2 and 3, and is an exploded perspective view of the whole.

FIG. 2 is an overall perspective view.

FIG. 3 is a side view showing a state of being attached to a substrate.

FIG. 4 shows an example of a conventional flyback transformer together with FIG. 5, and this figure is an overall perspective view.

FIG. 5 is a side view showing a state of being attached to a substrate.

6 shows a comparative example together with FIG. 7, and is a perspective view of the whole.

FIG. 7 is a side view showing a state of being attached to a substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flyback transformer 2 Case body 12 Low voltage bobbin 13 Upper side low voltage bobbin half 14 Lower side low voltage bobbin half 17 Input / output terminal 18 Low voltage winding 20b Fitting piece 21 Input / output terminal 22 Low voltage winding 23 High voltage bobbin 29 High voltage winding

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[Procedure amendment]

[Submission date] October 28, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012] Thus, when placed on the substrate j of the television receiver, other than the substrate j horizontal, i.e., when it is mounted in a vertical direction as shown in FIG. 5, the arrow direction of the motor
, The input / output terminals i, i, ...
The problem that it causes severe stress and causes disconnection etc.
was there.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Delete

Claims (3)

[Claims] 1. A cylindrical low-voltage bobbin wound with a low-voltage winding is inserted into a cylindrical high-voltage bobbin wound with a high-voltage winding, and a low-voltage winding wound around the low-voltage bobbin and an input / output terminal are provided. A flyback transformer that is connected and holds the high-voltage bobbin and the low-voltage bobbin in the case body, by projecting the input / output terminals from both ends of the low-voltage bobbin in a direction orthogonal to the axial direction, A flyback transformer that is characterized by protruding from both the upper and lower sides to the side. 2. The flyback transformer according to claim 1, wherein the low-pressure bobbin is axially dividable, and each of the divided low-pressure bobbin halves is fitted from both ends of the high-pressure bobbin. 3. The divided low pressure bobbin halves are provided with fitting portions at their tips so that the tips are connected to each other when the low pressure bobbin halves are fitted into the high pressure bobbin. The flyback transformer according to claim 1 or 2.