JP2000021653A - Small transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size furthermore while enhancing the assembling work by wiring the lead wire of a secondary coil along the outer side face at a flange part and connecting the lead wire with a terminal of the secondary coil. SOLUTION: Terminals 4, 5 of primary and secondary coils are planted, respectively, on the side faces of a pair of flange parts 2, 3. A primary coil 8 is then wound around a hollow drum section 7 and a secondary coil 9 is wound around the primary coil 8. End part of the lead wire 8a of the primary coil is then connected with the base part of the terminal 4 of the primary coil and the primary coil 8 is wired along the inner side face of the flange part 2 from the winding part. Furthermore, end part of the lead wire 9a of the secondary coil is connected with the base part of the terminal 5 for secondary coil and the secondary coil 9 is wired on the outer side face of the flange part 3 from the winding part. In addition, a rib-like insulation barrier 10 is erected inside the terminal 5 for the secondary coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small transformer mainly mounted on a printed circuit board of electronic equipment such as consumer television, audio equipment, and office automation equipment and control equipment. More specifically, the present invention relates to a small transformer that improves assembly workability and further reduces the size.

[0002]

2. Description of the Related Art Conventionally, various types of small transformers of this kind have been developed and used for each type. However, connection of lead wires between primary coils and terminals for primary coils, and secondary coils and secondary coils For the connection with the terminal for wiring, connect the inside by laying the inside of the flange part facing each other, or plant the connection terminal on the printed board and use the lead wire as it is for the wiring of the printed board and the terminal of other parts Connected and connected.

[0003]

For this purpose, soldering for connection from the inside of the primary coil terminal and the secondary coil terminal implanted on the respective side surfaces of the pair of opposed flanges is performed. When working, especially when using insulated wires covered with thick film insulation, it is necessary to remove the coating of the connection part, it becomes a fine manual work, it takes time and effort, and the production efficiency is poor And the primary coil side and 2
The space between the secondary coil and the connection portion of the lead wire is limited, which is an obstacle to miniaturization.

[0004]

SUMMARY OF THE INVENTION The present invention has been made as a result of diligent study in view of the above-mentioned circumstances, and has a bobbin, a pair of flange portions opposed to both sides of the bobbin, and a side wall of the flange portion. A terminal for a primary coil and a terminal for a secondary coil, a core fitting portion formed on the outer surface of the flange portion, a hollow winding drum portion opened to the core fitting portion and connecting the flange portion, and a winding drum portion. Wound primary coil and wound 2
In a small transformer comprising a secondary coil, a lead wire of a secondary coil is wired
It is connected to a terminal for a secondary coil, and further solves the problem by providing an insulation barrier inside a terminal for a secondary coil planted on a side surface of a flange portion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a small-sized transformer which improves the assembling workability and is further downsized.

[0006]

According to the present invention, since the connection between the lead wire of the secondary coil and the terminal for the secondary coil is routed along the outer side surface of the flange portion, the secondary coil implanted on the side surface of the flange portion of the small transformer is formed. Work efficiency can be improved because the lead wire can be extended outside the terminal for the secondary coil to remove the insulation coating or to perform connection work such as soldering, thereby improving the work efficiency. In addition, the lead wires of the primary coil side and the secondary coil Since the distance from the connection portion can be increased, the size of the compact transformer can be further reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A small transformer according to the present invention will be described with reference to the drawings of the embodiments.

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

The present invention relates to a small-sized transformer mainly attached to a printed circuit board of electronic equipment such as consumer television, audio equipment, and business OA equipment and control equipment. The present invention relates to a compact transformer for improving assembling workability and further downsizing, and relates to a bobbin 1, a pair of flange portions 2.3 opposed to both sides of the bobbin 2, and each of the flange portions 3. Terminals 4 and 2 for primary coils implanted on the side surfaces of 3.
Next coil terminals 5 and respective core fitting portions 2a. 2 formed on the outer surfaces of the respective flange portions 2.3 for fitting the cores 6. 3a and the respective core fitting portions 2a. It comprises a hollow winding drum 7 which is opened to 3a and connects a pair of flanges 2.3, a primary coil 8 wound on the winding drum 7, and a secondary coil 9 wound on the winding drum 7. In small transformers,
The secondary coil lead wire 9a is wired along the outer side surface of the flange portion 3 and connected to the secondary coil terminal 9, and the secondary coil terminal 9a is implanted on the side surface of the flange portion 3. The insulation barrier 10 is provided upright inside the coil terminal 5.

That is, the bobbin 1 of the small transformer embodying the present invention has a pair of plate-like flanges 2.3 opposed to each other in a side face in a parallel state, and as shown in FIG. The primary coil terminal 4 and the secondary coil terminal 5 are respectively implanted on each side surface of FIG. A plurality of terminals 5 are planted at equal intervals.

A core fitting portion 2 for fitting a core 6 to be described later is fitted on the outer surfaces of the pair of flange portions 2.3.
a. 3a, and each of the core fitting portions 2a. The bottom of 3a is connected to a winding drum 7 described later.

Next, the winding drum portion 7 is hollow, and the core fitting portions 2a. 3a, the core 6 described later is inserted through a hollow through-hole, that is, each core fitting portion 2
a. The through hole of the winding drum 7 communicates with the bottom of 3a.

Next, in the embodiment shown in FIG. 1, the primary coil 8 is a so-called enameled wire, which is wound around the outside of the hollow bobbin 7. ,
The secondary coil 9 as it is or with an insulating tape interposed
The secondary coil 9 has a thick film insulation,
Alternatively, an insulating wire coated with a multilayer insulating material is used.

In the small transformer according to the present invention, the connection between the end of the lead wire 8a of the primary coil and the base of the terminal 4 for the primary coil is performed by means such as soldering.
The primary coil 8 is wired from the winding portion along the inner side surface of the flange portion 2, and further, is connected to the end of the lead wire 9 a of the secondary coil and the base of the terminal 5 for the secondary coil. Is performed by means such as soldering, and the secondary coil 9 is wired along the outer side surface of the flange portion 3 from the wound portion.

In addition, according to the present invention, rib-shaped insulation barriers 10 are provided upright inside the secondary coil terminals 5 implanted on the side surfaces of the flange portion 3 of the bobbin 1 in order to ensure insulation. It was made.

The side surface of the flange portion 3 of the bobbin 1 to which the lead wire 8a of the primary coil is wired is the same as the insulating barrier 10 in order to maintain a posture when attached to a printed circuit board together with the insulating barrier 10. A plurality of columnar standing ribs having a height are formed, and the lead wire 8a of the primary coil is inserted between the standing ribs 11 to connect with the base of the terminal 4 for the primary coil. Things.

That is, the small transformer of the present invention firstly
The primary coil 8 is wound around the winding body 7 of the bobbin 1 with the lead wire 8a extended and then the secondary coil 9 is wound around the outer periphery with the lead wire 9a extended. An insulating tape is wound around the outer periphery.

The core fitting portions 2a.2 formed on the pair of flange portions 2.3 are formed. 3a and a core 6 made of ferrite or the like are inserted into the hollow portion of the winding body portion 7 from both sides and fixed by means such as sticking, and are fixed to the end of the lead wire 8a of the primary coil.
Connect and connect the base of the terminal 4 for the next coil,
End of lead wire 9a of secondary coil and terminal 4 for secondary coil
And the base is connected.

[0019]

According to the small coil of the present invention having the above structure, the work of connecting the end of the lead wire of the secondary coil and the terminal for the secondary coil can be performed from the outside, so that the working efficiency is improved. Further, the electrical connection of the printed circuit board to the circuit only requires the primary coil terminal and the secondary coil terminal to be inserted into the circuit, which improves the mounting workability and, in addition, connects the primary coil side to the circuit. Since the space between the secondary coil and the connection portion of the lead wire can be secured, the size of the small transformer can be further reduced, and this is an innovative and highly practical invention.

[Brief description of the drawings]

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

[Explanation of symbols]

 Reference Signs List 1 bobbin 2 flange portion 2a core insertion portion 3 flange portion 3a core insertion portion 4 terminal for primary coil 5 terminal for secondary coil 6 core 7 winding body 8 primary coil 8a lead wire of primary coil 9 secondary coil 9a Secondary coil lead wire 10 Insulation barrier 11 Standing rib

Claims (2)

[Claims] 1. A bobbin, a pair of flange portions opposed to both sides of the bobbin, a terminal for a primary coil and a terminal for a secondary coil implanted on a side surface of each of the flange portions, respectively, A core insertion portion formed on the outer surface of the flange portion for inserting a core, a hollow winding drum portion opened to the respective core insertion portion and connecting a pair of flange portions, and a winding drum portion; In a small transformer composed of a wound primary coil and a wound secondary coil, a lead wire of the secondary coil is wired along the outer side surface of the flange portion to form a terminal for the secondary coil. A small transformer characterized by connection. 2. The small transformer according to claim 1, wherein an insulation barrier is provided upright inside the secondary coil terminal planted on the side surface of the flange portion.