JPH0582023U - Coil bobbin structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a coil bobbin which is easy to assemble and which can be configured in a small size and a thin shape. [Structure] An outer bobbin 11 in which a secondary coil 15 is wound, which is formed in a hollow cylindrical shape, and a primary coil 16, which is formed in a cylindrical shape so as to be fitted in a hollow portion of the outer bobbin 11, is wound. An inner bobbin 12 to be connected, and the outer bobbin 11 and the inner bobbin 12 are provided with pins 13 and 14 for connecting the ends of the coil windings exposed to the outside in a fitted state. In addition, the surface around the inner bobbin 12 has an oval cross section, and the hollow portion of the outer bobbin 11 has a cross-sectional shape with sharp corners having a smaller radius than the surface around the inner bobbin. ing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a coil bobbin for winding a coil for an inverter transformer, for example.

[0002]

[Prior Art]

 Conventionally, such a coil bobbin is configured as shown in FIG. 5, for example. In the drawing, a coil bobbin 1 has an outer bobbin 2 having a hollow cylindrical shape in cross section and extending in the axial direction, for example, a high-voltage secondary coil to be wound, and a hollow portion of the outer bobbin 2. The inner bobbin 3 has a hollow cylindrical shape in cross section and extends in the axial direction so that it can be fitted in a telescopic manner, for example, an inner bobbin 3 on which a low-voltage primary coil is to be wound. The inner bobbin 3 has a plurality of pins 4 and 4'protruding axially or downward near one end thereof so as to be exposed to the outside in the fitted state.

According to the coil bobbin 1 having such a configuration, the primary side coil 3a is wound around the inner bobbin 3 and the end portion of the winding is connected to the pin 4, and then the inner bobbin 3 is removed. The inner bobbin 3 and the outer bobbin 2 are integrally connected by being fitted in the hollow portion of the outer bobbin 2 in a nested manner, and the secondary coil 2a is wound around the outer bobbin 2, and The ends of the winding are likewise connected to the pins 4 '. As a result, the secondary coil 2a and the primary coil 3a are held in a predetermined positional relationship with each other, and good coupling is obtained.

[0004]

[Problems to be solved by the device]

 However, in the coil bobbin 1 configured as described above, at the time of assembly, first, the winding wire forming the primary coil 3a is wound around the inner bobbin 3 and its end is provided near one end of the inner bobbin 3. The inner bobbin 3 is inserted into the hollow portion of the outer bobbin 2 and the winding forming the secondary coil 2a is wound around the outer bobbin 2 at its end portion. Is connected to the pin 4'provided near one end of the inner bobbin 3, the winding of the secondary coil 2a and the primary coil 3a and the connection to the pins 4 and 4'are performed sequentially. As a result, there was a problem that the workability of the assembly work was poor.

Further, as shown in FIG. 5B, the hollow portion of the outer bobbin 2 has a hollow portion in consideration of a so-called rising line 3b that winds the winding from the end of the inner coil 3a to the pin 4. Since it is formed so as to have a predetermined distance from the surface around the inner bobbin 3 or the surface of the primary coil 3a wound around the inner bobbin 3, with respect to the outer shape of the inner bobbin 3, Since the coil bobbin 1 is formed in a relatively large size, the entire coil bobbin 1 becomes large in size, and there is a problem in that it cannot be made thin in the height direction.

In view of the above points, the present invention has an object to provide a coil bobbin which is easy to assemble, and can be configured to be small and thin.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, according to the structure of the coil bobbin of the present invention, an outer bobbin having a hollow cylindrical shape, around which the secondary coil is to be wound, and the outer bobbin are fitted in the hollow space. An inner bobbin around which the primary coil is wound, the outer bobbin and the inner bobbin being exposed to the outside in a state of being fitted to each other. The end of the coil winding is provided with a pin to be connected, the surface around the inner bobbin has an oval cross-section, and the hollow portion of the outer bobbin surrounds the inner bobbin. It is characterized by having a cross-sectional shape with sharp corners with a radius smaller than the surface of.

[0008]

[Action]

 According to the above configuration, the outer bobbin and the inner bobbin are provided with the pins to which the ends of the coil windings are respectively connected, so that before the inner bobbin is fitted in the hollow portion of the outer bobbin, A simple operation of winding a winding wire around each of the outer bobbin and the inner bobbin, connecting the ends to the respective pins, and then fitting the inner bobbin into the hollow portion of the outer bobbin. This completes the coil bobbin assembly work. Therefore, the workability at the time of assembly can be improved.

Further, since the hollow portion of the outer bobbin has a cross-sectional shape with a sharp corner portion having a radius smaller than that of the surface around the inner bobbin, the inner bobbin is fitted in the hollow portion of the outer bobbin. In this state, a space is formed at four corners in a cross section between the inner surface of the hollow portion of the outer bobbin and the surface of the inner bobbin or the surface of the coil winding wound around the inner bobbin. Will be done. Therefore, since the rising line from the end of the coil winding to the pin can be routed along this space, the outer bobbin can be formed even thinner. Therefore, the entire coil bobbin is relatively thin.

[0010]

【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 coil bobbin according to the present invention. A coil bobbin 10 is formed in a substantially rectangular shape having a hollow cross section and extends in the axial direction thereof. The outer bobbin 11 to be turned and a primary coil having a hollow elliptical cross section and extending in the axial direction thereof, for example, so that it can be telescopically fitted in the hollow portion of the outer bobbin 11, for example, a low-voltage primary coil. And an inner bobbin 12 to be wound. Each of the outer bobbin 11 and the inner bobbin 12 has a plurality of pins 13 and 14 projecting axially or downward near one end thereof so as to be exposed to the outside in the fitted state.

The coil bobbin 10 according to the present invention is configured as described above, and at the time of assembly, the coil bobbin is wound around the outer bobbin 11 and the inner bobbin 12 in advance, respectively. By configuring the secondary coil 15 and the primary coil 16 and connecting the ends of the coil windings to the pins 13 and 14 provided near the ends of the outer bobbin 11 and the inner bobbin 12, respectively, The secondary coil 15 of the outer bobbin 11 and the primary coil 16 of the inner bobbin 12 are held in a predetermined positional relationship with each other by a simple operation of fitting the inner bobbin 12 into the hollow portion of the outer bobbin 11. Has been made available to obtain the desired good bond.

In this case, the rising line 16 a extending from the winding end of the primary coil 16 wound around the inner bobbin 12 to the pin 14 has a hollow portion having a substantially rectangular cross section of the outer bobbin 11 and the inner bobbin 12. It is routed along the space S existing at the four corners of the cross section between the peripheral surface having the elliptical cross section and the surface of the primary coil 16. As a result, the inner surface of the hollow portion of the outer bobbin 11 can be brought into close contact with the peripheral surface of the inner bobbin 12 or the surface of the primary coil 16 so as to have a small distance. It can be formed thin.

In the embodiment described above, the case where the outer bobbin 11 has a hollow portion whose cross-sectional shape is substantially rectangular has been described, but the present invention is not limited to this, and the primary coil wound around the inner bobbin 12 is described. It is only necessary that the space S capable of accommodating the 16 rising lines 16a can be secured, and for example, a hollow elliptical shape having a radius smaller than the elliptical shape of the inner bobbin 12 at a corner may be used. it is obvious.

[0014]

[Effect of the device]

 As described above, according to the present invention, since the outer bobbin and the inner bobbin are provided with the pins to which the ends of the coil windings are connected, respectively, before the inner bobbin is fitted in the hollow portion of the outer bobbin. Simply wind a winding around each of the outer bobbin and the inner bobbin, connect the ends to the respective pins, and then fit the inner bobbin into the hollow part of the outer bobbin. Since the work of assembling the coil bobbin is completed by a simple operation, the workability in the assembling can be improved. Also, since the hollow portion of the outer bobbin has a cross-sectional shape with sharp corners having a smaller radius than the surface around the inner bobbin, when the inner bobbin is fitted in the hollow portion of the outer bobbin, Spaces are formed at four corners in cross section between the inner surface of the hollow portion of the outer bobbin and the surface of the inner bobbin or the surface of the coil winding wound around the inner bobbin. Therefore, since the rising line from the end of the coil winding to the pin can be routed along this space, the outer bobbin can be made smaller and thinner, and the entire coil bobbin can be relatively It can be configured in a small size. Thus, according to the present invention, it is possible to provide an extremely excellent coil bobbin which is easy to assemble, and which can be configured to be small and thin.

[Submission date] April 23, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. 1 to 3 show an embodiment of a coil bobbin according to the present invention. A coil bobbin 10 has a hollow rectangular cross section and extends in the axial direction thereof. The outer bobbin 11 on which the coil is to be wound and the hollow bobbin 11 having a hollow elliptical cross section and extending in the axial direction of the outer bobbin 11 so that the coil can be telescopically fitted, for example, a low pressure And the inner bobbin 12 around which the primary side coil is to be wound. The outer bobbin 11 and the inner bobbin 12 each have a plurality of pins 13 and 14 projecting axially or downward near one end thereof so as to be exposed to the outside in the fitted state.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

The coil bobbin 10 according to the present invention is constructed as described above. At the time of assembly, the coil bobbin 10 has a primary coil around the inner bobbin 12 and a secondary coil around the outer bobbin 11 as shown in FIG. A secondary coil 15 and a primary coil 16 are formed by winding the next coil 15, and the ends of the coil windings are provided near the ends of the outer bobbin 11 and the inner bobbin 12, respectively. By connecting the inner bobbin 12 to the inner bobbin 12 by connecting the inner bobbin 12 to the inner bobbin 12 by connecting the inner bobbin 11 to the inner bobbin 11, the inner bobbin 12 is fitted into the hollow part of the outer bobbin 11. The primary coil 16 and the primary coil 16 are brought into a predetermined positional relationship with each other so as to obtain a desired good coupling.

[Brief description of drawings]

1 shows an embodiment of a coil bobbin according to the present invention, (A) is a schematic side view and (B) is an enlarged sectional view.

2 shows the inner bobbin in the embodiment of FIG.
(A) is a plan view and (B) is a side view.

3 shows an outer bobbin in the embodiment of FIG. 1, (A) is a plan view and (B) is a side view.

FIG. 4 is a plan view showing a state in which a coil winding is wound around the inner bobbin of FIG.

FIG. 5 shows an example of a conventional coil bobbin,
(A) is a perspective view and (B) is an enlarged sectional view.

[Explanation of symbols]

 10 coil bobbin 11 outer bobbin 12 inner bobbin 13 pin 14 pin 15 secondary coil 16 primary coil 16a rising line

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[Procedure amendment]

[Submission date] April 23, 1992

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Scope of utility model registration request] 1. An outer bobbin, in which a secondary coil is to be wound, which is formed in a hollow cylindrical shape, and a primary coil, which is formed in a cylindrical shape so that the secondary coil can be fitted in the hollow portion of the outer bobbin. An inner bobbin to be wound, wherein the outer bobbin and the inner bobbin are connected to each other, and a pin to which the end of the coil winding exposed to the outside is connected. And a cross-sectional shape in which the surface around the inner bobbin has an oval cross section, and the hollow portion of the outer bobbin has a sharp corner with a smaller radius than the surface around the inner bobbin. Characterized by having,
Coil bobbin structure.