JP2604104Y2 - Trance - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to relates to a transformer, especially liquid
Of cathode ray tube for back light source of crystal display
The present invention relates to a transformer suitable for use in a power supply .

[0002]

2. Description of the Related Art Laptop type, notebook type, palm top type word processors, STN liquid crystal display units for personal computers, etc., use side-light type backlights to reduce the thickness of liquid crystal panels and light guide plates and the thickness of cathode tubes. It is trying to give the feature of.

In order to cope with this, it is indispensable to make the transformer thinner in order to make the inverter power supply thinner. In addition, since a battery is used as a driving power source, there is a strong demand for higher efficiency of the inverter power source. Inverter power supplies have been made thinner by surface mounting, and transformers have also been made thinner by surface mounting structures.

[0004]

[0005]

The present invention is to provide a way conventional in Trang
Is the central core part inserted into the coil winding part of the bobbin
The thickness of the outside is located outside the coil winding part
Since the thickness is the same as the thickness of the frame core,
The line part also becomes large, and it cannot respond to the thinning of the transformer.
No.

[0006]

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a transformer which can be made thin .

[0008]

In order to achieve the above-mentioned object, the present invention is based on the object of the present invention, which has a rectangular cross section in the longitudinal direction and a thickness t.
1 is a plate-like I thinner than a width w1 orthogonal to the longitudinal direction.
Coil winding part such as shaped core Magnetic circuit core and its coil
Flat at positions corresponding to both ends of the winding magnetic circuit core
One with a concave part such as a concave part with
External magnetism such as frame-shaped core (□ -shaped core) or U-shaped core
A circuit core and a coil are wound, and an end face having a thickness t1
Form a core insertion hole for inserting the magnetic circuit core
The thickness t3 is thinner than the width w3 orthogonal to the longitudinal direction.
And a flat coil bobbin.

And a thickness of the magnetic circuit core of the coil winding portion.
The thickness t1 is formed smaller than the thickness t2 of the external magnetic circuit core.
And a coil winding portion from the core insertion opening of the coil bobbin.
Insert the magnetic circuit core and insert the coil
Both ends are projected from the coil winding part, and the coil winding
The both ends of the external magnetic circuit core are recessed in the external magnetic circuit core.
On the coil winding part of the magnetic circuit core
The lower surface of the end is recessed in the external magnetic circuit core via the spacer
Opposite to the bottom of the part, both ends of the coil winding magnetic circuit core
Of the external magnetic circuit core
And the coil winding part of the coil bobbin is
Insert inside the magnetic circuit core and
For example, between the outer surface and the inner surface of the external magnetic circuit core
Characterized by an insulator made of synthetic resin
Things.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is configured as described above, and is a plate-shaped coil winding having a thickness t1 smaller than a width w1.
Partial magnetic circuit core, flat shape with thickness t3 thinner than width w3
And the coil winding part magnetic circuit
Thickness t1 is smaller than the thickness t2 of the external magnetic circuit core.
In addition, both ends of the coil winding magnetic circuit core are externally magnetized.
Place the coil bobbin in the recess of the air circuit core.
Insert and arrange the coil windings inside the external magnetic circuit core.
And absorb the thickness of the spacer by forming a recess
Therefore, it is possible to reliably reduce the total height of the transformer and reduce the thickness. In addition, the coil winding
The bottom and side surfaces of both ends of the
By facing the bottom and side surfaces, the coil winding
The magnetic flux leakage from both ends of the air circuit core is reduced,
The performance of the sensor can be improved. As mentioned earlier, along with thinning,
Place the coil winding of the coil bobbin inside the external magnetic circuit core.
Side, the coil winding and external magnetic
Road core approaches. Therefore, in the present invention, the coil winding
Between the part and the external magnetic circuit core, for example, a synthetic resin molding
By approaching the insulator consisting of
In this state, the insulation between them is assured.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a perspective view of the split winding bobbin from above, FIG. 2 is a perspective view of the split winding bobbin from below, FIG. 3 is an exploded perspective view of the transformer, FIG. 4 is a perspective view of the transformer from above, and FIG. Is a perspective view from below, and FIG. 6 is a perspective view showing a joined state of the I-shaped core and the frame-shaped core. FIG. 7 is a perspective view of a frame type core according to another example, and FIG. 8 is a perspective view showing a joint state of the frame type core and the I-type core.

The split winding bobbin 1 shown in FIG. 1 and FIG. 2 is separated on both sides of the primary coil winding groove 2 by partition flanges 5 so that the secondary coil- (I) winding groove 3 and the secondary coil- (II ) A winding groove 4 is provided. Reference numeral 6 in the drawing denotes a core insertion port provided on the end face . As shown in FIG. 3, the thickness t3 is the width w orthogonal to the longitudinal direction.
3 (t3 <w3), and the whole is flat
are doing.

FIG. 3 shows a primary coil 7 and a secondary coil.
The (I) 8, the secondary coil-(II) 9 is shown in the divided winding bobbin 1 wound. First, the secondary coil- (I) 8 is wound around the secondary coil- (I) winding groove 3, and the terminals 15 and 16 are pulled out with a lead wire. Next, the primary coil 7 is wound around the primary coil winding groove 2, and lead wires are pulled out from the terminals 10 to 14 and pulled out. Finally, the secondary coil- (II) 9 is wound around the secondary coil- (II) winding groove 4, and a lead wire is wound around the terminals 17, 20 and the like and pulled out. The winding of the coil is a secondary coil-
(II) 9, the primary coil 7, and the secondary coil- (I) 8 may be wound in this order.

An insulating holder 21 is fitted to the divided bobbin 1 wound with the primary coil 7, the secondary coil (I) 8, and the secondary coil (II) 9. As shown in FIG. 1, if a fitting guide portion such as a round shape is provided at each corner of the partition flange 5 provided on the divided winding bobbin 1, when the insulating holter 21 is fitted to the winding portion of the divided winding bobbin 1. It is smooth and reliable.

As shown in FIG. 1, the insulating holder 21 includes two vertical portions 21a, 21a extending in parallel so as to face both side surfaces of the winding portion of the divided winding bobbin 1, and each vertical portion 21a.
two horizontal portions 2 projecting outward in the horizontal direction from the lower end of
1b, 21b and two connecting portions 21 for connecting the opposite ends of the two vertical portions 21a, 21a, respectively.
c, 21c and an insertion piece 21d erected inside one of the vertical parts 21a is formed of a frame forming body integrally formed.

The vertical portion 21a and the horizontal portion 21b connected to the vertical portion 21a form a primary coil 7, a secondary coil (I) 8,
The insulation between the secondary coil- (II) 9 and the frame core 25 is
The terminals 10 to 20 and the frame-shaped core 2
By inserting the insertion piece 21c between the lead wire of the primary coil 7 and the secondary coil-(I) 8, the insulation between the two can be achieved at the same time.

An I-shaped core 22 made of, for example, a magnetic material having a high saturation magnetic flux density and having a rectangular cross section in the longitudinal direction is inserted through the core insertion opening 6 of the divided winding bobbin 1 inserted into the insulating holder 21. As shown in FIG. 3, the thickness t1 of the I-shaped core 22 is a plate shape thinner than the width w1 orthogonal to the longitudinal direction.
(T1 <w1), and is thinner than the thickness t2 of the frame-shaped core 25 (t1 <t2). Therefore, the winding portion of the divided winding bobbin 1 into which the I-shaped core 22 is inserted is also formed. It is getting thinner.

The frame-shaped core 25 has a hollow portion 3 as shown in FIG.
0, and the plane shape is a rectangular frame shape.
Concave portions 26a and 26b are formed at positions corresponding to both end portions 23a and 23b of the shaped core 22 so that the bottom surface is flat and stepped. Spacers 24a and 24b are attached to the recesses 26a and 26b.

As described above, the I-shaped core 22 is inserted into the winding portion of the divided winding bobbin 1, and both ends 23 of the I-shaped core 22 are formed.
a, 23b protrude from the winding portion, and both ends 2
3a and 23b are recessed through spacers 24a and 24b.
6a and 26b, and the winding portion of the divided winding bobbin 1 is arranged in the hollow portion 30 of the frame-shaped core 25 (see FIG. 4).

FIG. 6 shows the divided bobbin 1 and the insulating holder 21.
FIG. 4 is a view showing a joint state between the I-shaped core 22 and the frame-shaped core 25 with the both ends 23a and 23b of the I-shaped core 22 inserted into the recesses 26a and 26b of the frame-shaped core 25 and adhesive The I-shaped core 22 and the frame-shaped core 25 are joined to form a closed magnetic circuit.

As shown in FIG. 2, both ends 23a and 23b of the I-shaped core 22 are almost completely accommodated in the recesses 26a and 26b of the frame-shaped core 25.
a, 23b are formed with concave portions 26a,
It faces three surfaces, namely, the bottom surface and both side surfaces of 26b.

FIGS. 4 and 5 are perspective views of the transformer. The terminals 10 to 14 are the terminals of the primary coil 7, the terminals 15 and 16 are the low voltage terminal and the high voltage terminal of the secondary coil-(I) 8, respectively, and the terminals 17 and 20 are the secondary coil-(II) 9 respectively. Low and high voltage terminals.

When the terminals 16 and 17 are connected to the external lead wire or the transformer by a pattern provided on the substrate when the transformer is mounted on the substrate, the secondary coil- (I) 8 and the secondary coil- (II) are connected. 9 is connected in series, and a secondary output is taken out from a terminal 20. If the secondary coil- (I) 8 and the secondary coil- (II) 9 are not connected in series, two secondary outputs will be obtained.

FIGS. 7 and 8 are perspective views showing another example. A frame-shaped core 25b according to this example is an I-shaped core 22b.
The groove-shaped recesses 33a and 33b penetrating from the inner end to the outer end are formed substantially in the center of the short side corresponding to both ends of the groove. By forming such concave portions 33a and 33b, the position in the longitudinal direction when the I-shaped core 22b is inserted can be adjusted, and the I-shaped core 22b and the frame-shaped core 25b can be adjusted.
Is easy to assemble.

[0025]

According to the first aspect of the present invention, a plate-shaped core having a thickness t1 smaller than a width w1 is provided.
The coil winding magnetic circuit core and the thickness t3 is thinner than the width w3
Using a flat coil bobbin
The thickness t1 of the magnetic circuit core is equal to the thickness t2 of the external magnetic circuit core.
And the coil windings at both ends of the magnetic circuit core
Placed in the recesses of the external magnetic circuit core,
Insert the bobbin coil winding inside the external magnetic circuit core.
Insert and arrange and absorb the thickness of the spacer by forming the recess.
As a result , the total height of the transformer can be reliably reduced and the thickness can be reduced. Also coil winding part magnetic
The lower and side surfaces of both ends of the circuit core are
By facing the bottom and side surfaces of the
Leakage magnetic flux from both ends of the wire magnetic circuit core is reduced.
As a result, transformer performance can be improved. Thin as described above
As a result, the coil winding part of the coil bobbin is
By inserting it inside the core,
The magnetic circuit core approaches. Therefore, in the present invention,
For example, synthetic resin between the coil part and the external magnetic circuit core
By interposing an insulator made of molded
Even between them, insulation between them is ensured.

According to the second aspect of the present invention, the concave portion has an external magnetic field.
It penetrates from the inner end to the outer end of the air circuit core. this
So that the coil winding part magnetism on the external magnetic circuit core
The position of the circuit core in the longitudinal direction can be adjusted, and an external magnetic circuit
Easy assembly of core and coil winding magnetic circuit core
You.

According to a third aspect of the present invention, there is provided an external magnetic circuit
Adhesively fix the ends of the coil winding magnetic circuit core with the recesses
I have decided. When using the adhesive in this way the dent
Since the part becomes an adhesive reservoir, the adhesive is applied to the external magnetic circuit core.
To the other part of the coil winding part of the magnetic circuit core
A small amount of adhesion without uncertainty
Adhesive ensures that the coil winding magnetic circuit core is
it can.

According to a fourth aspect of the present invention, a transformer is installed.
Specified for barta. This allows the inverter
The thickness of the source can be reduced.

[0029]

[0030]

[0031]

[Brief description of the drawings]

FIG. 1 is a top perspective view of a split winding bobbin used in a transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view from below of the divided winding bobbin.

FIG. 3 is an exploded perspective view of the transformer according to the embodiment of the present invention.

FIG. 4 is a top perspective view of the transformer.

FIG. 5 is a perspective view of the transformer from below.

FIG. 6 is a perspective view showing a joining state of an I-shaped core and a frame-shaped core in the transformer.

FIG. 7 is a perspective view of a frame-shaped core according to another example of the present invention.

FIG. 8 is a perspective view showing a joint state of the frame-shaped core and the I-shaped core.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Split winding bobbin 2 Primary coil winding groove 3 Secondary coil- (I) winding groove 4 Secondary coil- (II) winding groove 5 Partition flange 6 Core insertion port 7 Primary coil 8 Secondary coil- (I) 9 Secondary Ikoru- (II) 21 Insulation holder 22 Coil winding part magnetic circuit core 21a Vertical part 21b Horizontal part 21c Connecting part 21d Insert piece 22, 22b I-shaped core 23a, 23b Both ends of I-shaped core 25, 25b Frame-shaped core 26a, 26b, 33a, 33b Recess 30 Hollow portion t1 Thickness of I-shaped core t2 Thickness of frame-shaped core t3 Thickness of divided winding bobbin w1 Width of I-shaped core w3 Width of divided winding bobbin

Continued on the front page (51) Int.Cl. ⁷ Identification code FI H01F 27/32 H01F 27/24 D 31/00 A

Claims (4)

(57) [Scope of request for utility model registration] 1. A rectangular cross-section in a longitudinal direction and a thickness t
1 is a plate-shaped I-shape thinner than a width w1 orthogonal to the longitudinal direction.
Coil winding part magnetic circuit core and the positions corresponding to both ends of the coil winding part magnetic circuit core
One with a recess with a flat bottom and side
An external magnetic circuit core and a coil are wound, and a coil winding portion having a thickness t1 is formed on an end face.
Forming a core insertion port for inserting the air circuit core, and forming a thickness t3
Is thinner than the width w3 perpendicular to the longitudinal direction.
Bobbin, and the thickness t1 of the coil winding part magnetic circuit core is
It is formed to be thinner than the thickness t2 of the air circuit core, and the coil winding portion magnetic winding is inserted through the core insertion opening of the coil bobbin.
And insert the winding core into the coil windings at both ends of the magnetic circuit core.
Projecting from the coil winding part, and both ends of the coil winding part magnetic circuit core
Placed in the recesses of the circuit core,
The lower surface of both ends of the air circuit core is
Make the coil winding part magnetic by facing the bottom of the concave part of the circuit core.
Insert the sides of both ends of the circuit core into the recesses of the external magnetic circuit core.
While facing the side surface, the coil winding portion of the coil bobbin is connected to an external magnetic circuit core.
And the outer surface of the coil winding portion and the outer magnetic circuit core.
A transformer characterized in that an insulator is interposed between the inner surface and the inner surface . 2. The method according to claim 1, wherein said recessed portion is outside.
A transformer penetrating from the inner end to the outer end of the magnetic circuit core . 3. The method according to claim 1, wherein said recess is formed in said recess.
The end of the coil winding magnetic circuit core is externally magnetized with adhesive.
A transformer fixed to an air circuit core . 4. The transformer according to claim 1, wherein the transformer is
A transformer characterized by being a transformer for an inverter .