JPH0672224U - Trance - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention reduces the number of parts by forming a coil directly on a printed circuit board and makes it thin, and is also suitable for high voltage type and insulation type. The purpose of the present invention is to provide a transformer that can be done. A coil 12 made of a conductive pattern spirally formed on the surface of a printed board 11, cores 13 and 14 attached to the printed board so as to face each other from both sides of the printed board, and the core. The transformer 10 is configured to include a coil 15 formed of a long flexible substrate 15a having a conductive pattern 15b wound around the central core portion and extending along the longitudinal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transformer arranged on a printed circuit board.

[0002]

[Prior art]

 Conventionally, when a transformer is arranged on a printed circuit board, the transformer is configured as shown in FIG. 9, for example. That is, in FIG. 9, the transformer 1 is formed in a hollow cylindrical shape having a hollow portion 2a, and is wound between the flange portions 2b and 2c with respect to the coil bobbin 2 having the flange portions 2b and 2c at both ends. By winding the winding in the groove 2d, the primary coil 3 and the secondary coil 4 are formed, and the winding lead terminals of the coils 3 and 4 are moved downward from the lower flange portion 2c of the coil bobbin 2. The coil bobbin 2 is constructed by bending the pin 5 provided so as to extend and inserting and fixing the core 6 in the hollow portion 2a of the coil bobbin 2.

When the transformer 1 configured as described above is mounted on the printed board 7, the pins 5 are inserted into the mounting holes 7 a provided on the printed board 7 and the transformer 1 is soldered or the like. 1 is fixed on the printed circuit board 7 and is electrically connected to a conductive pattern or the like formed on the printed circuit board 7.

[0004]

[Problems to be solved by the device]

 However, in the thus configured transformer 1, the winding is wound around the groove of the coil bobbin 2 to form the primary coil 3 and the secondary coil 4, and the windings of the coils 3 and 4 are further formed. It is necessary to bind the lead terminal to the pin 5. For this reason, the number of parts is large and the assembling work becomes complicated, and the coil bobbin having the pins is mounted on the printed circuit board at the time of mounting the printed circuit board on the printed circuit board. There was a problem that it would end up.

Further, since the primary coil 3 and the secondary coil 4 are wound in the same groove portion, there is a problem that they are not suitable when a high voltage type or an insulation type transformer is configured. It was

In view of the above points, the present invention reduces the number of parts by forming a part of the coil directly on the printed circuit board and makes it thin. It is intended to provide a transformer which can be suitably used.

[0007]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide a coil having a conductive pattern formed in a spiral shape on the surface of a printed circuit board and the printed circuit board so as to face each other from both sides of the printed circuit board in the area of the coil. A transformer, comprising: a core attached to a substrate; and a coil formed of a long flexible substrate having a conductive pattern wound around a central core portion of the core and extending along a longitudinal direction. Is achieved by

Further, according to the present invention, the above-mentioned object is such that the core attached to the printed circuit board and the central core portion of the core inserted into the printed circuit board so as to face each other from both sides of the printed circuit board. And a coil made of an elongated flexible substrate having a plurality of conductive patterns that extend in parallel at least along the longitudinal direction.

Further, according to the present invention, the above object is to provide a core attached to the printed circuit board and a central core portion of the core inserted in the printed circuit board so as to face each other from both sides of the printed circuit board. A coil of an elongate flexible substrate having a plurality of electrically conductive patterns wound at least longitudinally and longitudinally separated by insulating portions. It is achieved by a transformer, which is characterized in that

[0010]

[Action]

 According to the first configuration, one coil can be configured by forming a conductive pattern on the printed circuit board, and the other coil can directly extend in the longitudinal direction with respect to the central core portion of the core. Since it can be configured by winding a long flexible board with a pattern, a coil bobbin for the coil is not required, so the number of parts can be reduced, and the parts cost and the assembly cost can be significantly reduced. become. Further, since the coil bobbin is not required and the coil is formed on the printed board in a plane or wound directly on the core, the height of the coil protruding above the printed board can be greatly reduced. The number of transformers can be reduced, and the entire transformer can be made thin. Further, since the coil on the printed circuit board and the coil wound around the core are separated from each other, they can be reliably insulated from each other, so that a high-voltage type or an insulation type coil can be easily constructed. You will get it.

Further, according to the second configuration, each coil is wound around the central core portion of the core by winding a long flexible base plate having a plurality of conductive patterns extending parallel to the longitudinal direction. Since it can be configured by turning, a multi-output circuit can be formed with one flexible board, and since a coil bobbin for the coil is not required, the number of parts is reduced, and the parts cost and the assembly cost are drastically reduced. Could be reduced. Furthermore, since the coil is wound directly around the core, the height protruding above the printed circuit board is significantly reduced, and the entire transformer can be made thin.

Further, according to the third configuration, each coil extends in the longitudinal direction directly with respect to the central core portion of the core and is isolated in the longitudinal direction via the insulating portion. Since it can be constructed by winding a long flexible board having a plurality of conductive patterns, the primary and secondary windings can be formed with one flexible board, and the coil bobbin for the coil is unnecessary. Therefore, the number of parts can be reduced, and the parts cost and the assembly cost can be significantly reduced. Furthermore, since the coil is wound directly around the core, the height of the coil protruding above the printed circuit board is significantly reduced, and the entire transformer can be made thin. Further, since the coils are separated from each other by the insulating portion, they can be reliably insulated from each other, and a high-voltage type or an insulation type coil can be easily constructed. Become.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a transformer according to the present invention, in which a transformer 10 is a coil made of a conductive pattern spirally formed on the surface of a printed board 11, in the illustrated case, on the upper surface. For example, the primary coil 12, the cores 13 and 14 mounted on the printed circuit board 11 so as to face each other from above and below the printed circuit board 11 in the region of the coil 12, and the core 13 are wound around the core 13. It is composed of a rotated secondary coil 15.

As shown in FIG. 2, the primary coil 12 has an end 12 a on one side (spiral outer side) with respect to two connecting lead patterns 16 and 17 extending leftward in the drawing. It is directly and integrally connected to one of the lead patterns 16, and the other end (inner side of the spiral) 12b intersects with the spirally formed primary coil 12, and the other end Is connected to the lead pattern 17.

Regarding this intersecting portion, in the illustrated case, the other end 12 b of the primary coil 12 is connected to the lead pattern 17 via a jumper 19 that intersects on the insulating layer 18 placed on the primary coil 12. However, the present invention is not limited to this, and the end 12b can be connected to the lead pattern 17 via a conductive pattern formed inside the multilayer printed circuit board 11, for example. May be.

As shown in FIG. 1, of the cores 13 and 14, the core 13 includes a disc-shaped main body 13a, a central core portion 13b extending downward from a central portion of the main body 13a, It is composed of an annular core portion 13c extending downward from the peripheral portion of the main body 13a, and the annular core portion 13c is cut out at a part thereof which faces each other in the diametrical direction.

The core 13 configured as described above is wound around a central core portion 13b thereof with a secondary coil 15 to be described later, and then the core 13 is wound around the central core portion 13b with respect to a region including the coil 12 of the printed circuit board 11. The core portion 13b is inserted into the insertion hole 11a provided in the printed circuit board 11, the annular core portion 13c is inserted into the insertion hole 11b, and the central core portion 13b and the annular core portion 13c are projected to the lower surface of the printed circuit board 11. However, it can be fixed to the upper surface of the core 14. As a result, the cores 13 and 14 are attached so as to sandwich the printed circuit board 11.

Here, as shown in FIG. 3, the secondary coil 15 is composed of a long flexible substrate 15a and is provided with a conductive pattern 15b extending along the longitudinal direction thereof. Both ends of the conductive pattern 15b are bent in the vertical direction and protrude from the side edges of the flexible substrate 11c to form connection terminal portions 15c and 15d.

By winding such a flexible substrate 15a so that the connection terminals 15c are on the inner side, the secondary coil 15 can be configured as shown in FIG. At this time, when the flexible substrate 15a has an insulating portion 15e extending in the longitudinal direction and having no conductive pattern 15b, as shown by the chain line in FIG. An insulating layer is defined inside the next coil 15, and its winding lead terminal is connected to the lead patterns 20 and 21 formed on the lower surface of the printed board 11.

Further, the secondary coil 15 is fitted on the central core portion 13 b of the core 13, and the connection terminal portions 15 c and 15 d thereof are connected to the lead pattern 20 formed on the lower surface of the printed circuit board 11. 21 is connected. As a result, the transformer 10 constitutes the equivalent circuit shown in FIG.

The transformer 10 according to the present invention is constructed as described above, and the cores 13 and 14 around which the coil 15 is wound are mounted on the printed circuit board 11 on which the coil 12 is formed. Thus, the assembly of the transformer 10 is completed. Therefore, the number of parts is small and the assembly can be easily performed.

Further, since the coils 12 and 15 are formed on the surface of the printed circuit board 11 in a plane, the heights of the coils 12 and 15 protruding above the printed circuit board 11 with the cores 13 and 14 attached thereto are high. However, it can be remarkably reduced, and the reduction in thickness can be promoted.

Furthermore, since the primary coil 12 and the secondary coil 15 are configured as multiple windings, the degree of coupling between the primary coil 12 and the secondary coil 15 can be made relatively large.

FIG. 6 shows a modification of the secondary coil 15. That is, in FIG. 6, the secondary coil 22 is composed of a long flexible substrate 22a, and a plurality of the secondary coils 22 extend in parallel to each other along the longitudinal direction thereof. In the case of FIG. The conductive patterns 22b, 22c, and in the case of FIG. 6B, three conductive patterns 22b, 22c, 22d are provided.

According to such a secondary coil 22, each conductive pattern 22b, 22c, 22d has a different output, so that it can be applied to a multi-output circuit.

In this case, any of the conductive patterns 22b, 22c, 22d can be used as the primary coil. In that case, the primary pattern formed by the print pattern formed on the printed circuit board 11 can be used. The coil 12 may be omitted.

FIG. 7 shows another configuration example of the secondary coil. That is, in FIG. 7, the secondary coil 23 is composed of a long flexible substrate 23a, and extends along the longitudinal direction of the secondary coil 23a and is separated from each other in the longitudinal direction. The book includes conductive patterns 23b and 23c. As a result, the conductive patterns 23b and 23c are insulated from each other by the insulating portion between them.

Therefore, according to such a secondary coil 23, since the respective conductive patterns 23b and 23c have different outputs, it can be applied to a multi-output circuit.

In this case, it is also possible to use one of the conductive patterns 23b and 23c as the primary coil. In that case, the primary coil 12 formed of the printed pattern on the printed circuit board 11 is Further, since the conductive patterns 23b and 23c are separated from each other by the insulating portion 23d, a transformer suitable as a high voltage type or an insulation type can be provided.

In the above-described embodiment, the printed circuit board 11 and the core 13 are respectively provided with one primary coil 12 and one secondary coil 15, but the present invention is not limited to this. For example, a plurality of coils may be formed on the upper surface of 11 so as to form a spiral shape in the state of being close to each other, and further, on the lower surface of the printed circuit board, for example, a plurality of coils may be in the state of being close to each other. It is obvious that the coil may be formed into a spiral shape, and a plurality of coils may be wound around the central core portion 13a of the core 13.

[0031]

[Effect of device]

 As described above, according to the present invention, by forming the coil directly on the printed circuit board, the number of parts is reduced and the structure is thin, and it is also suitable for high voltage type and insulation type. A very good transformer could be provided, which could be used.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a transformer according to the present invention.

2 is a schematic cross-sectional view of the transformer of FIG.

FIG. 3 is a development view of a secondary coil in the transformer of FIG.

FIG. 4 is a schematic perspective view of the secondary coil of FIG. 3 in use.

5 is an equivalent circuit diagram of the transformer of FIG.

6 (A) and 6 (B) are developed views showing another configuration example of the secondary coil in the transformer of FIG. 1.

FIG. 7 is a development view showing still another configuration example of the secondary coil in the transformer of FIG.

FIG. 8 is a schematic perspective view of the secondary coil of FIG. 7 in use.

FIG. 9 is a schematic sectional view showing an example of a conventional transformer.

[Explanation of symbols]

Reference Signs List 10 transformer 11 printed circuit board 11a, 11b insertion hole 12 primary coil (coil formed of conductive pattern) 13 upper core 14 lower core 15, 22, 23 secondary coil 15a, 22a, 23a flexible substrate 15b, 22b, 22c, 22d, 23b , 23c
Conductive pattern 15c, 15d Connection terminal part 16, 17, 20, 21 Lead pattern 18 Insulating layer 19 Jumper

Claims (3)

[Scope of utility model registration request] 1. A coil formed of a conductive pattern spirally formed on the surface of a printed circuit board, and a core attached to the printed circuit board so as to face each other from both sides of the printed circuit board in the area of the coil. And a coil formed of a long flexible substrate having a conductive pattern which is wound around a central core portion of the core and extends along a longitudinal direction. 2. A core attached to the printed circuit board so as to face each other from both sides of the printed circuit board, and a core wound around the central core portion of the core inserted into the printed circuit board, at least in the longitudinal direction. A coil comprising a long flexible substrate having a plurality of conductive patterns extending in parallel along the transformer. 3. A core mounted on the printed circuit board so as to face each other from both sides of the printed circuit board, and wound around a central core portion of the core inserted into the printed circuit board in at least a longitudinal direction. A coil comprising a long flexible substrate having a plurality of conductive patterns extending along the longitudinal direction and separated by insulating portions in the longitudinal direction.