JP2000331848A - Transformer and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer used by being incorporated into television and the like wherein production efficiency and economy are improved, and the properties can be stabilized and prevented from changing due to stress to a core resulting from difference in thermal expansion. SOLUTION: Notch windows 2a and 2b are formed on both sides of a base 2, and two cores 5 and 6 are adhered to the base 2 in one notch window 2a. In the other notch window 2b, the two cores 5 and 6 are adhered to each other. As a result, the rigidity on both sides of the base 2 is reduced by notch windows 2a and 2b, and only one end of the cores 5 and 6 is adapted to be fixed to the base 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in a television, a display, a vehicle-mounted electronic device, and the like, and a method of manufacturing the transformer.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing an example of a conventional transformer. FIG.
(B) is a figure which shows the adhesion process.

Conventionally, as a transformer of this type, as shown in FIG. 3, a pair of upper and lower E-shaped pattern coils 3 are mounted on a rectangular frame-shaped base 2 having four legs (not shown) formed at four lower portions. The thin and light transformer 1 incorporated together with the cores 5 and 6 is often used.

When manufacturing the transformer 1, FIG.
As shown in (a), after the cores 5 and 6 are fitted and opposed from both upper and lower sides of the pattern coil 3, the cores 5 and 6 are inserted into the base 2 in that state, and the cores 5 and 6 are fixed to the base 2 with the tape 10. As shown in FIG. 3B, the end side surfaces 4 of the cores 5 and 6 are formed.
Adhesive 12 is applied to the location to adhere both cores 5, 6 to base 2. In FIG. 3B, illustration of the tape 10 is omitted.

[0005]

However, this has the following disadvantages.

First, in order to manufacture the transformer 1, the tape 10 must be wound and then bonded, which requires two steps of a taping step and a bonding step. In addition, since taping and four-point bonding are costly, they are inferior in economy.

Second, during assembly of the transformer 1, the cores 5, 6
Are easily displaced up and down, and the positioning thereof is difficult, and the distance between the cores 5 and 6 and the pattern coil 3 is not fixed, so that the characteristics (magnetic permeability, inductance, etc.) of the transformer 1 may vary.

Third, since the cores 5 and 6 and the base 2 are firmly fixed by four-point bonding, stress is generated in the cores 5 and 6 due to the difference in the coefficient of thermal expansion between the two, and the characteristics of the transformer 1 are reduced. Change. In addition, this stress causes the core 5,
6 may have cracks.

In view of such circumstances, the present invention is excellent in production efficiency and economic efficiency, suppresses variations in characteristics, stabilizes the characteristics, and avoids changes in characteristics due to stress on the core due to a difference in coefficient of thermal expansion. And a method for manufacturing the same.

[0010]

That is, according to the transformer of the present invention, a pattern coil (3) and a pair of upper and lower E-shaped cores (5, 6) are incorporated in a square frame base (2). In a transformer (1) having legs (2d) formed below the base, a core mounting surface (2e) is formed on the legs of the base, and the core is mounted on the core mounting surface. You. By employing such a configuration, the core and the pattern coil act so as to be stably supported on the core mounting surface of the base.

Further, notch windows (2a, 2b) are formed on both side surfaces of the base (2), and the two cores (5, 6) and the base are adhered to each notch window. Is done. With such a configuration, the rigidity of both side surfaces of the base acts so as to be reduced by the size of the cutout window.

Further, notch windows (2a, 2b) are formed on both side surfaces of the base (2), and one of the notch windows (2a, 2b) is formed.
In (a), the two cores (5, 6) and the base are bonded together, and the other cutout window (2b) is bonded to the two cores. With such a configuration,
The rigidity of both sides of the base is reduced by the cutout window, and at the same time, only one end of the core is fixed to the base.

Further, the cutout window (2a) is formed in a wave shape. With such a configuration, it acts so as to increase the bonding area between the core and the base.

On the other hand, the invention of the transformer manufacturing method of the present invention is characterized in that the lower core (6) is mounted on the core mounting surface (2e) of the base (2) when manufacturing the transformer (1). Then, the pattern coil (3) is placed on the core, and then the upper core (5) is placed on the pattern coil.
, And finally, the two cores are fixed to the base. By adopting such a configuration, the production of the transformer is completed only by the bonding step, and the step is simplified.

It should be noted that reference numerals in parentheses are for convenience showing corresponding elements in the drawings, and therefore, the present invention is not limited to the description on the drawings. The same applies to the column of “Claims”.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing an embodiment of a transformer according to the present invention, wherein (a) is an assembled perspective view, (b) is an exploded perspective view, (c) is a left side view, and FIG. 3A is a detailed view showing a base of the transformer shown in FIG. 1, (a) is a plan view thereof, (b) is a left side view thereof, (c) is a right side view thereof, (d) is a front view thereof, (FIG. e) is a bottom view thereof.

As shown in FIG. 1, the transformer 1 has a base 2 in the form of a square frame, and a pattern coil 3 is incorporated in the base 2 together with a pair of upper and lower E-shaped cores 5 and 6. I have.

Here, as shown in FIG. 2, the base 2 has a main body 2c, and triangular prism-shaped legs 2d are formed at four lower portions of the main body 2c. As shown in FIG. 2A, a core mounting surface 2e is formed on each leg 2d, and four lower corners of the core 6 are supported on these core mounting surfaces 2e. Mounted in the form. In addition, a corrugated cutout window 2a is formed on one side surface (the right side surface in FIG. 2A) of the main body 2c. In this cutout window 2a, as shown in FIG. The cores 5, 6 and the main body 2 c of the base 2 are adhered by an adhesive 8. On the other hand, the other side surface of the main body 2c (FIG. 2A)
A U-shaped cutout window 2b is formed on the left side surface), and the core 5 and the core 6 are bonded to each other with an adhesive 9 in the cutout window 2b, as shown in FIG. .

In the transformer 1 having such a configuration,
It is possible to prevent the cores 5 and 6 from being stressed due to the difference in the coefficient of thermal expansion between the base 2 and the cores 5 and 6 and changing the characteristics. That is, notch windows 2a, 2b are formed on both side surfaces of the main body 2c of the base 2, so that the rigidity of the main body 2c is reduced by that amount, and the two cores 5, 6 Are fixed to each other via adhesives 8 and 9 at the same time, and at the same time, only one end is fixed to base 2 via adhesive 8.
Both the base 6 and the base 2 can be expanded independently, and there is no occurrence of a situation in which the expansion of the cores 5, 6 causes stress on the cores 5, 6 to change the characteristics. In this transformer 1, a conventional four-point bonded transformer 1 (FIG. 3)
(See (b)), but the cutout window 2a of the base 2 is corrugated and has a large bonding area, so that a decrease in the bonding strength between the cores 5, 6 and the base 2 is suppressed. As a result, the vibration resistance of the transformer 1 is ensured.

By the way, when manufacturing the transformer 1, the following procedure is performed.

First, the lower core 6 is inserted into the base 2 and mounted on the core mounting surface 2e. Then, the core 6 is easily positioned on the core mounting surface 2e and is stably supported.

Next, the pattern coil 3 is placed on the core 6.
Is placed, and the core 5 is placed on the pattern coil 3. At this time, since the lower core 6 is supported in a stable state, the pattern coil 3 and the upper core 5 overlapping thereover are positioned at predetermined positions. Further, since the distance between the cores 5 and 6 and the pattern coil 3 is constant, there is no variation in the characteristics (magnetic permeability, inductance, etc.) of the transformer 1.

Thereafter, as shown in FIG. 1A, the upper and lower cores 5 and 6 and the main body 2c of the base 2 are adhered to each other with an adhesive 8 in the corrugated cutout window 2a of the base 2. As shown in FIG. 1C, the cores 5 and 6 are bonded to each other with an adhesive 9 in the U-shaped cutout window 2b of the base 2.
Here, the adhesive 9 does not adhere to the base 2. Then, the transformer 1 is completed.

As described above, the transformer 1 is manufactured only by the bonding step, and the taping step is not required. Therefore, the productivity is improved by the simplification of the step, and the material cost and the working cost of the taping are reduced. It is also economical because it is reduced.

In the above-described embodiment, the two cores 5, 6 are prevented from changing their characteristics due to stress on the cores 5, 6 due to the difference in the coefficient of thermal expansion between the base 2 and the cores 5, 6. Although the transformer 1 has been described in which the transformers 6 are adhered to each other at both ends thereof and only one end thereof is adhered to the base 2, if the characteristics can be prevented from changing by the stress on the cores 5 and 6 by another means, In this case, both ends of the two cores 5 and 6 can be bonded to the base 2 to further improve the vibration resistance of the transformer 1.

[0027]

As described above, according to the transformer of the present invention, the pattern coil 3 and the pair of upper and lower E-shaped cores 5 and 6 are incorporated in the base 2 having a rectangular frame shape.
In a transformer 1 having legs 2d formed below the base 2, a core mounting surface 2e is formed on the legs 2d of the base 2, and the cores 5, 6 are mounted on the core mounting surface 2e. Therefore, since the cores 5 and 6 and the pattern coil 3 are stably supported on the core mounting surface 2e of the base 2, it is possible to suppress variations in the characteristics of the transformer 1 and stabilize it.

Further, notch windows 2a, 2b are formed on both side surfaces of the base 2, and the two cores 5, 6 and the base 2 are bonded to each other in the notch windows 2a, 2b. The rigidity of both sides of the base 2 is a notch window 2a,
2b, the base 2 and the cores 5, 6
It is possible to reduce the change in characteristics due to stress on the cores 5 and 6 due to the difference in the coefficient of thermal expansion of the cores.

Notch windows 2a and 2b are formed on both sides of the base 2, and the two cores 5 and 6 are bonded to the base 2 at one notch window 2a, and the other notch is formed. Since the two cores 5 and 6 are bonded to each other in the window 2b, the rigidity of both sides of the base 2 is reduced by the cutout windows 2a and 2b, and at the same time, the cores 5 and 6 are reduced.
Is fixed to the base 2 only at one end thereof, so that it is possible to avoid a characteristic change due to stress on the cores 5 and 6 due to a difference in the coefficient of thermal expansion between the base 2 and the cores 5 and 6. .

Further, since the notch window 2a is formed in a wave shape, the bonding area between the cores 5, 6 and the base 2 is increased, so that the vibration resistance of the transformer 1 can be secured.
Cores 5 and 6 due to the difference in thermal expansion coefficient between base 2 and cores 5 and 6
It is possible to reduce or avoid a change in characteristics due to the stress on the substrate.

On the other hand, according to the transformer manufacturing method of the present invention, when the transformer 1 is manufactured, the lower core 6 is mounted on the core mounting surface 2e of the base 2, and thereafter, The pattern coil 3 is placed on 6 and then
Since the upper core 5 is placed on the pattern coil 3 and finally the two cores 5 and 6 are fixed to the base 2, the manufacture of the transformer 1 is completed only by the bonding step. However, since the steps are simplified, the transformer 1 can be efficiently and economically manufactured.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a transformer according to the present invention, wherein (a) is an assembled perspective view, (b) is an exploded perspective view, and (c) is a left side view.

FIG. 2 is a detailed view showing a base of the transformer shown in FIG. 1, (a) is a plan view thereof, (b) is a left side view thereof,
(C) is a right side view, (d) is a front view, and (e) is a bottom view.

FIG. 3 is a perspective view showing an example of a conventional transformer.
(A) is a figure which shows the taping process, (b) is a figure which shows the adhesion process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transformer 2 ... Base 2a, 2b ... Notch window 2d ... Leg part 2e ... Core mounting surface 3 ... Pattern coil 5, 6 ... E-shaped core

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 31/00 U (72) Inventor Fumiaki Nakao 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. Inside the company (72) Inventor Toshikazu Urata 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Katsuo Yamada 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. F term (reference) 5E059 LL12 5E070 AA11 AB02 BA08 DA01 DB04 DB06

Claims (5)

[Claims] 1. A transformer in which a pattern coil (3) and a pair of upper and lower E-shaped cores (5, 6) are incorporated in a square frame base (2), and a leg (2d) is formed below the base. (1) The transformer according to (1), wherein a core mounting surface (2e) is formed on a leg portion of the base, and the core is mounted on the core mounting surface. 2. A notch window (2) is provided on both sides of the base (2).
2. The transformer according to claim 1, wherein a, 2b) are formed, and two cores (5, 6) and the base are bonded in each cutout window. 3. A cut-out window (2) on both sides of the base (2).
a, 2b), and in one cutout window (2a) two cores (5,
6. The transformer according to claim 1, wherein the core is bonded to the base, and the two cores are bonded to each other at the other cutout window. 4. The transformer according to claim 2, wherein the cutout window (2a) has a corrugated shape. 5. When manufacturing the transformer (1) according to claim 1, a lower core (6) is mounted on a core mounting surface (2e) of a base (2), and thereafter the core is mounted on the core. The pattern coil (3) is mounted on the pattern coil, and then the upper core (5) is mounted on the pattern coil, and finally, the two cores are fixed to the base. Transformer manufacturing method.