JPH0810168Y2 - Trans bobbin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to, for example, a connecting structure of a trans bobbin,
More specifically, the present invention relates to a core of a high withstand voltage transformer bobbin used in a communication device, etc., a primary coil, and a transformer bobbin having enhanced insulation between the secondary coils.

(Prior Art) As a conventional bobbin, for example, as shown in FIGS. 4 (a) and 4 (b), an insertion hole 102 extending in the longitudinal direction through which the long side of an L-shaped core 101 is inserted. And a bobbin member 100 having a concave portion 105 for sequentially winding the primary coil 103 and the secondary coil 104 on the outer peripheral surface, and the coils 103, 10 provided at both axial ends of the bobbin member 100.
There has been a structure in which a flange portion 106 covering both end edges of 4 is provided, and lead terminals 107 and 108 projecting downward from the flange portion 106 and respectively connected to the primary coil 103 or the secondary coil 104.

By the way, such a transformer bobbin has a primary coil 103 and a secondary coil 104 due to an atmosphere of high humidity or accidental intrusion of water.
An insulating sheet is provided between the primary coil 103 and the secondary coil 104 to prevent water from entering between
In addition to interposing 109, a silk thread, an insulating tape 110, or the like is wound inside the collar 106 at a height equivalent to the winding thickness of the primary coil 103, and after the primary coil 103 is wound, the collar is further wound. The insulating tape 111 or the like is wound inside the 106 to improve the withstand voltage between the coils 103 and 104. In addition, it is necessary to secure the insulation between the core 101 and the coils 103 and 104 by the collar portion.
It was done by 106. Further, insulation between the lead terminals 107 and 108 is performed by attaching an insulating tape or by passing each lead terminal through an insulating sleeve.

However, such a conventional transformer bobbin has a defect that the creepage distance at the ends of the primary coil 103 and the secondary coil 104 is short and the withstand voltage between the coils 103 and 104 is still small. Further, the dielectric strength between the core 101 and the coils 103 and 104 is still small only by the presence of the collar portion 106, and increasing the diameter of the collar portion 106 violates the request for downsizing of the bobbin. Further, there is a defect that the insulating work between the lead terminals 107 and 108 is troublesome and expensive.

(Purpose of the Invention) The present invention has been made by paying attention to the above-mentioned defects, and it is possible to secure a long creeping distance between the core, the primary coil and the secondary coil, thereby increasing the withstand voltage. The purpose is to provide a trans bobbin that can be manufactured.

(Outline of the Invention) In order to achieve the above object, the present invention has the following configuration.

A bobbin member having an insertion hole extending in the axial direction for inserting one side of the L-shaped core therein and having a recess for sequentially winding the primary coil and the secondary coil on the outer peripheral surface, and an axial direction of the bobbin member. What is claimed is: 1. A trans bobbin provided at both end portions, comprising a collar portion covering both end edges of the coil, wherein the trans bobbin is configured by combining two of the trans bobbin, wherein the collar portion has a rectangular end surface shape, A first protruding axially outward on three sides of the outer peripheral portion of the collar portion.
The fin portion is erected to increase the creepage distance between the core and the primary coil and the secondary coil, and the end face of the collar portion is provided with an edge portion of an axial end portion opening of the insertion hole. By providing a second fin portion projecting in the axial direction and covering the L-shaped core portion which is not housed in the insertion hole with the second fin portion, a space between the core, the primary coil and the secondary coil is provided. The creepage distance is increased so that one of the first and second terminals respectively connected to the primary coil or the secondary coil is projected from the collar portion in the axial direction, and the other is projected in the radial direction. The creepage distance between the primary coil and the secondary coil is lengthened by separating the distance between the first terminal and the second terminal via the first fin portion.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a single state of a transformer bobbin according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are cross-sectional views of a transformer completed by using the transformer bobbin of FIG. It is an end view. The trans bobbin 1 has an insertion hole 3 inside through which one side (long side) of one of the two L-shaped cores 2 is inserted, and has a primary coil 4 and a secondary coil 5 on the outer peripheral surface such as a mylar sheet. Bobbin member 1A having a recessed portion 7 which is sequentially wound in a laminated state via the insulating sheet of FIG. 1, and both end edges (insulating tape 6a are interposed) of both coils 4 and 5 provided at both axial ends of the bobbin member 1A. The flange 8 (rectangular end surface shape), and the first and second lead terminals 9 protruding from the axial end surface and the lower surface of the flange portion 8 and specially connected to the primary coil 4 and the secondary coil 5, respectively. , 10 and, for example, the core 2 inserted into the two trans bobbins 1 is sandwiched by the springs 11 or the like and connected, which is the same as in the conventional case.

In this embodiment, the first fin portion 12 extending axially outward is provided on three sides of the outer peripheral portion of the flange portion 8 having a rectangular end face.
To connect the first fin portions 12 to each other and to extend from the two opposing edges of the opening of the insertion hole 3 opened at the end surface of the collar portion 8 in parallel with each other in the axial direction. The second fin portion 13 is erected. The reason why the first fin portion 12 is protruded from three sides and is not protruded from the entire outer peripheral portion (all four sides) of the collar portion 8 is that the sides of the two bobbins where the first fin portion 12 does not exist are illustrated. This is because they are joined as shown in 2 (a).
The second fin portion 13 covers the outer surface of the L-shaped core portion that does not completely fit into the insertion hole 3. With this configuration, the creeping distance between the core 2 and the primary coil 4 and the secondary coil 5 is increased by the fin portions 12 and 13, and the collar portion 8 is small in size without increasing its diameter. It is possible to suppress the intrusion of water between the core 2 and the primary coil 4 and the secondary coil 5 to increase the withstand voltage.

Further, while the protruding position of the lead terminal 9 is the lower surface of the collar portion 8, the protruding position of the lead terminal 10 is the side surface of the collar portion 8,
Both lead terminals are separated. With such a configuration, it is possible to increase the withstand voltage without performing a complicated process between the lead terminals 9 and 10 as in the related art and to reduce the cost.

FIG. 3 shows another embodiment. In this embodiment, the collar portion 8 of one trans bobbin 1 (in this example, the bobbin shown by the solid line).
The fin portion 13 provided on the bobbin 1 is projected toward the other bobbin 1 (the bobbin shown by the broken line), and the notch 14 into which the fin portion 13 of the one bobbin 1 is inserted is formed in the collar portion 8 of the other bobbin 1. Of course, the relationship between the fin portion 12 and the notch 14 is set at a position where they engage with each other when the bobbin 1 is connected. With this configuration, it is possible to increase the creeping distance between the bobbins 1 and 1 when the bobbins 1 and 1 are connected. In this case, for example, the fin portion 13
The bobbin can be fitted in the notch 14
It is possible to easily connect 1 and 1.

The invention is not limited to the above embodiment,
For example, the insulating sheet 6 may be paper or Teflon,
The fin portion 12 of the collar portion 8 may be plural instead of one.
Needless to say, the same effect can be obtained even if the shape of the trans bobbin 1 is cylindrical.

(Effect of the Invention) As described above, according to the present invention, the fin portion is provided upright on the outer peripheral portion of the collar portion, or the fin portion that covers the outside of the core in the axial direction from the end portion of the collar portion is provided. By erecting, the creepage distance between the core and the primary coil and secondary coil is increased to increase the dielectric strength voltage, or they are individually connected to the primary coil or secondary coil provided so as to project from the collar portion. By separating the protruding positions of the first and second terminals from each other, the creeping distance between the primary coil and the secondary coil can be increased, and the withstand voltage can be increased, which is a significant effect.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a transbobbin according to the present invention, FIG. 2 (a) is a cross-sectional view of FIG. 1, and FIG. 2 (b).
Is a side view of FIG. 2 (a), FIG. 3 is a perspective view of another embodiment, FIG. 4 (a) is a plan view of a conventional example, and FIG. 4 (b) is of FIG. 4 (a). It is a side view. 1 ... Trans bobbin, 2 ... Core, 3 ... Insertion hole, 4
…… Primary coil, 5 …… Secondary coil, 7 …… Concave, 8 ...
… Collar part, 12 …… Fin part, 13 …… Fin part

Claims (1)

[Scope of utility model registration request] 1. A bobbin member having an insertion hole extending in the axial direction for inserting one side of an L-shaped core therein and having a concave portion for successively winding a primary coil and a secondary coil on an outer peripheral surface thereof, What is claimed is: 1. A trans bobbin provided with axially opposite end portions of a bobbin member, the flange portions covering both end edges of the coil, wherein the trans bobbin is constituted by combining two trans bobbin portions, the collar portion having an end surface shape. Is a rectangle, and a first fin portion projecting outward in the axial direction is erected on three sides of the outer peripheral portion of the collar portion to increase the creepage distance between the core and the primary coil and the secondary coil. Then, a second fin portion axially protruding from the edge portion of the axial end opening of the insertion hole is provided on the end surface of the flange portion, and the second fin portion is provided.
By covering the L-shaped core portion which is not housed in the insertion hole with the fin portion, the creeping distance between the core and the primary coil and the secondary coil is lengthened, and the primary coil or the secondary coil is provided. One of the first and second terminals respectively connected to each other is projected in the axial direction from the flange portion and the other is projected in the radial direction, and the distance between the first terminal and the second terminal is set to the above-mentioned value. A trans bobbin characterized in that the creepage distance between the primary coil and the secondary coil is lengthened by separating them via the first fin portion.