JP2000124025A - Transformer coil bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent disconnection of the secondary winding by providing a terminal holding face which implants the secondary winding terminal with a step portion which is depressed relative to the other face by one step. SOLUTION: In a coil bobbin of a transformer, the primary winding terminals 2, 3 and the secondary winding terminal 4 are provided upright on a terminal holding face 1a of the bobbin 1. Thick wires are wound on the primary winding terminals 2, 3 as the primary winding, and the secondary winding 6 of thin wire is wound on the secondary winding terminal 4. Then, non-soldering portion is provided on the base of the secondary winding terminal 4, and by loosening the portion on the secondary winding 6, the disconnection of the secondary winding 6 can be prevented even when external force is applied to the secondary winding terminal 4. That is, a step 7 lowered by one step relative to the other face is formed in a portion which includes an implanting portion of the secondary winding terminal 4 on the terminal holding face 1a of the bobbin 1. As a result, the non-soldered portion is surely secured on the base of the secondary winding terminal 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin of a transformer having a terminal for entanglement of a very thin electric wire, and more particularly to an unsoldered portion of the electric wire at the root of the terminal during dip soldering. And a bobbin structure with reduced disconnection.

[0002]

2. Description of the Related Art FIGS. 2A and 2B are configuration diagrams of a coil bobbin according to a conventional example, wherein FIG. 2A is a front view and FIG. 2B is a side view. On the terminal holding surface 1a of the bobbin 1, the primary winding terminals 2, 3
And the secondary winding terminal 4 are provided upright. A primary wire 5 which is a thick electric wire is entangled with the primary winding terminals 2 and 3,
A secondary winding 6, which is a very thin electric wire, is entangled with the secondary winding terminal 4.

The terminal holding surface 1a is provided with terminals 2 and 3 for primary winding.
Is provided on the same plane as the portion on which the secondary winding terminal 4 is provided. Therefore, when dip soldering is performed, the terminals 2, 3, and 4 are immersed in the solder bath at the same depth.

[0004]

As described above, when a thick primary wire and a thin secondary wire are tied to respective terminals and soldered, a plurality of bobbins on the same plane are used. When the terminals are simultaneously dipped, each terminal is immersed in the solder bath at the same depth, and the wire is soldered to the root of the terminal, which lowers the mechanical strength of the secondary winding, which is a very thin wire. I do. When an external force is applied to the terminal in that state, the secondary winding may be disconnected.

In order to avoid this problem, it is necessary to separately perform dip soldering of the primary winding entangled portion and dip soldering of the secondary winding entangled portion. A new problem of lowering occurs.

Accordingly, the present invention provides a transformer coil bobbin capable of suppressing disconnection of the secondary winding even when dip soldering is performed simultaneously when the primary winding and the secondary winding are soldered to each terminal. The purpose is to provide.

[0007]

In order to achieve the above object, a first means is to provide a primary winding terminal for tying the primary winding and a secondary winding thinner than the primary winding. In a coil bobbin of a transformer provided with a secondary winding terminal, the unsoldered portion is provided at a root portion of the secondary winding terminal.

[0008] The second means is the first means,
The unsoldered portion is a step portion formed at a portion of the terminal holding surface where the secondary winding terminal is implanted, one step lower than the other surface.

As described above, in the present invention, the terminal holding surface portion on which the terminal for the secondary winding is planted is lowered by one step with respect to the other surface so as to be depressed. Due to the presence of the step formed in this way, when the primary winding entangled portion and the secondary winding entangled portion are subjected to the same dip soldering, an extremely fine electric wire is provided at the root portion of the secondary winding terminal. The unsoldered portion of the secondary winding is secured. Therefore, the secondary winding in the unsoldered portion can have a slack, and disconnection of the secondary winding that occurs when the secondary winding terminal is soldered to the root is eliminated.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a coil bobbin according to an embodiment of the present invention, in which (a) is a front view and (b) is a side view. On the terminal holding surface 1a of the bobbin 1, primary winding terminals 2 and 3 and a secondary winding terminal 4 are provided upright. The primary winding terminals 2 and 3 are tied to the primary winding 5 which is a thick electric wire, and the secondary winding terminal 4 is tangled to the secondary winding 6 which is an extra fine electric wire.

Here, in the present invention, an unsoldered portion is provided at the root portion of the secondary winding terminal 4 and the secondary winding 6 in this portion is slackened, so that an external force is applied to the secondary winding terminal 4. Is added to prevent disconnection of the secondary winding 6.

More specifically, as shown in FIG. 1, a portion of the terminal holding surface 1a of the bobbin 1 including the planting portion of the secondary winding terminal 4 is provided with a stepped portion 7 one step lower than the other surface. To form

With such a configuration, even when the primary winding terminals 2 and 3 are deeply immersed in the solder bath at the time of dip soldering, the secondary winding with the extra fine secondary winding 6 entangled therein. The unsoldered portion can be secured at the base of the terminal 4 for
It is possible to eliminate the disconnection that occurs when the electric wire is immersed in the solder to the terminal base.

[0014]

As described above, according to the present invention,
Due to the presence of a step formed by lowering the terminal holding surface portion on which the terminal for the secondary winding is implanted by one step with respect to the other surface so as to be depressed, the primary winding entangled part and the secondary When the winding entangled portions are subjected to the same dip soldering, an unsoldered portion of the secondary winding, which is a very thin electric wire, can be secured at the root of the secondary winding terminal. Therefore, the secondary winding in the unsoldered portion can be slackened, and disconnection of the secondary winding that occurs when the secondary winding terminal is soldered to the root can be eliminated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a coil bobbin according to an embodiment of the present invention, where (a) is a front view and (b) is a side view.

FIG. 2 is a configuration diagram of a coil bobbin according to a conventional example, and FIG.
Is a front view, and (b) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bobbin 1a Terminal holding surface 2, 3 Terminal for primary winding 4 Terminal for secondary winding 5 Primary winding 6 Secondary winding 7 Stepped portion

Claims (2)

[Claims] 1. A coil bobbin for a transformer comprising a primary winding terminal for winding a primary winding and a secondary winding terminal for winding a secondary winding thinner than the primary winding. A coil bobbin for a transformer, wherein an unsoldered portion is provided at a root portion of the secondary winding terminal. 2. The non-soldered portion according to claim 1, wherein the unsoldered portion is a step portion that is one step lower than another surface formed on a portion where the terminal for the secondary winding is implanted, of the terminal holding surface. A coil bobbin for a transformer.