JPH044728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to transformers used in various electronic devices.

BACKGROUND ART Conventionally, this type of transformer has had a structure as shown in FIGS. 6 to 9. That is, in FIG. 6, the primary coil 3 and the secondary coil 4 are wound around the primary coil bobbin 1 and the secondary coil bobbin 2, respectively, and after the primary coil bobbin 1 is installed in the secondary coil bobbin 2, the external lead wire 5 is passed through and bent. Holding hole 6
The U-shaped lead terminal plate 7 having a side of
The configuration included a magnetic core 11 and a mounting bracket 12.

Problems to be Solved by the Invention In such a conventional configuration, it is difficult to mechanize the connection between the lead wire 9 and the core wire 8 of the external lead wire 5, and the assembly and inspection process after the lead wire 5 is attached is difficult. However, the lead wires 5 reduce work efficiency, and since the U-shaped lead terminal plate 7 for holding the lead wires 5 is used, the cost is also low.

The present invention solves these problems,
The object of the present invention is to provide an inexpensive transformer that can automate the connection of the core wires of the leader wire and the external lead wire, has excellent workability, and is inexpensive.

Means for Solving the Problem In order to solve this problem, the present invention provides terminals for winding and connecting the core wires of the leader wire and the external lead wire, respectively, in the flanges of the primary and secondary coil bobbins. However, the external lead wires can be connected after the assembly and inspection process.

Effects With the above-described configuration, the present invention allows the lead wire to be automatically wound and soldered to the terminal using the terminals implanted in the inner and outer coil bobbins, and assembly and inspection work can be performed without external lead wires. This makes it possible to automate the connection of external lead wires to terminals, eliminates the need for lead terminal boards, and reduces the number of coils.

Embodiment FIGS. 1 to 5 are cross-sectional views of an embodiment of the present invention,
In FIG. 2, reference numeral 13 denotes an inner coil bobbin with flanges 14 and 15 on both sides.
4 has dimensions that fit into the frame for mounting the outer coil bobbin 16, which will be described later.
A lead-out groove 19 is provided on one side of the collar 15 for leading out the lead-out wire 18 of the primary coil 17, which is an inner coil, and a connecting terminal 2, which will be described later, is provided adjacent to the lead-out groove 19.
0 is planted.

Reference numeral 16 denotes an outer coil bobbin, which has flanges 21 on both sides.A pull-out groove 24 is provided on one side of one of the flanges 21 for pulling out the lead wire 23 of the secondary coil 22, which is the outer coil. Connecting terminals 20, which will be described later, are planted adjacent to each other.

The connection terminal 20 includes a protrusion 25 for winding and soldering the lead wire 18, and a core wire 27 of the external lead wire 26.
It is a plate-shaped terminal having a protruding piece 28 for winding and soldering connection, and a fixing piece 30 for crimping and fixing the sheathing part 29 of the external lead wire 26.The method of implantation is insert molding or second method. As shown in FIG. 3, a T-shaped groove 31 is provided on the collar and a fixing claw 32 is provided on the terminal, so that they can be connected by press-fitting.

On both sides of the flanges 15 and 21 having connection terminals 20 for the inner and outer coil bobbins 13 and 16, there are lead wires 18 and 23, which will be described later, and on both sides of a case 33 for the purpose of insulating and protecting the solder joints of the core wires 27. Fixing claws 35 that engage with the engagement holes 34 are provided, respectively.

As shown in FIG. 2, with the lead wires 18 and 23 connected to the connection terminals 20, the magnetic core 36 and the mounting bracket 37 are attached, and after the characteristic test is completed, the external lead wire 26 is crimped and fixed with the fixing piece 30. The core wire 27 is connected to the projecting piece 28, and then the case 33 is fitted to form the transformer shown in FIG.

Effects of the Invention As described above, according to the present invention, since plate terminals are used in the transformer, wiring work from the winding to the lead wire can be automated during winding, and assembly and inspection work can be performed with the plate terminal in place. This improves work efficiency, mechanizes the connection of external lead wires, and eliminates the need for lead terminal boards, which were previously required, resulting in cost reduction.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a transformer of the present invention, FIG. 2 is a perspective view of a coil bobbin according to an embodiment of the present invention, and FIG. 3 is a terminal and an insertion groove according to an embodiment of the present invention. FIG. 4 is a perspective view of a transformer according to an embodiment of the present invention, FIG. 5 is a perspective view of a completed transformer according to an embodiment of the present invention, and FIG. 6 is a perspective view of a coil bobbin of a conventional transformer. , a perspective view of a lead terminal plate, FIG. 7 is a perspective view of a conventional transformer when assembled, FIG. 8 is a perspective view of a completed conventional transformer, and FIG. 9 is a sectional view of the conventional transformer. 13...Inner coil bobbin, 14...Tsuba, 15
...Brim, 16...Outer coil bobbin, 17...Inner coil, 18...Leader wire, 19...Leader groove, 2
0... Connection terminal, 21... Tsuba, 22... Outer coil, 23... Lead wire, 24... Lead groove, 25...
Projection piece, 26... External lead wire, 27... Core wire, 2
8... Projection piece, 29... Covering part, 30... Fixed piece,
31... T-shaped groove, 32... Fixed claw, 33... Case, 34... Fitting hole, 35... Fixed claw, 36
...Magnetic core, 37...Mounting bracket.

Claims (1)

[Claims] 1. An outer coil bobbin with an outer coil wound thereon is attached to the outer periphery of an inner coil bobbin with an inner coil wound thereon, which is attached to the magnetic core, and a protruding piece connecting the lead wire of each coil is attached to the exposed collar of both coil bobbins. A connection terminal made by punching out a plate, which integrally includes a protrusion for connecting the core wire of the external lead wire and a fixing piece for crimping and fixing the insulation film of the external lead wire, is installed, and the lead wires of each of the coils are connected to the protrusion of the connection terminal. A transformer is made by connecting the core wire of the external lead wire to the protrusion, crimping and holding the insulation film of the external lead wire with a fixing piece, and covering these connecting and crimped parts with a molded case.