JPS6147612A - Transformer bobbin - Google Patents

Abstract

PURPOSE:To prevent disconnection of lead wire of coil wound to terminal pins by inserting terminal pins and dowels to the hole provided to the printed circuit board and fixing them by soldering to copper foil provided to the printed circuit board when the dowel integrally formed to the bobbin is plated by gold and a transformer is provided to the printed circuit board. CONSTITUTION:A plurality of terminal pins 6 are embedded to the one end surface of coil bobbin 4. The lead wire of coil wound to the bobbin is connected to the terminal pins 6. The dowels 13 consisting of nylon, PSS, fenol, etc. are formed integrally with bobbin 4 at the four surfaces of the same end surface of the terminal pins 6 of the bobbin 4. The circumference of dowel 13 is provided with metal plating 14 such as copper or chromium. The transformer comprising bobbin 4 can be mounted to the printed circuit board by the following procedures that the terminal pins 6 embedding to the bobbin 4 are inserted into a hole 10 provided to the board, the dowels 13 are inserted to the hole 15 of board 9 and the plated dowels 13 and terminal pins 6 are fixed to the copper foil 11 with the solder 12 at the opposite side of the board.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a winding frame for a small power transformer used in radio, television, video equipment, etc. by being directly attached to a printed circuit board.

Structure of conventional example and its problems Power transformers used in radio receivers and television receivers are usually E type as shown in Figs. 4 and 5 of the attached drawings.
Iron core consisting of type core 2 and I type core 3, and winding frame (bobbin)
It consists of a coil 5 wound around 4. This power transformer l is often used by directly attaching it to a printed circuit board, so that one end surface of the winding frame 4 around which the coil 5 is wound has a diameter of 0.5 to 2 mm. A plurality of Oram circular or square terminal pins 6 made of copper alloy with a length of 5 to lhm are embedded, and the spring end and end of the coil 5 or the lead wire 7 of the intermediate tap are connected to the pins 6. After wrapping it, fix it with solder 8,
As shown in FIG. 6, a method is adopted in which these terminal pins 6 are inserted into a plurality of holes 10 provided in a printed circuit board 9 and fixed to a copper foil 11 of the printed circuit board with solder 12.

However, in this method, the transformer l is fixed to the printed circuit board 9 only by the terminal pin 6, so if the lead wire 7 wound around the pin 6 has a thin diameter of 0.3 m+w or less, the transformer cannot be connected. When an external shock or vibration is applied, such as when the product is dropped, a direct force is applied to the pin 6, causing the pin to rise above the winding frame 4, causing the lead wire 7 to break, resulting in defective products. There are problems such as. A similar disconnection accident also occurs when the pin 6 and the winding frame 4 are loosely fitted.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems, securely fix a heavy transformer to a printed circuit board, and prevent breakage of the coil lead wires wound around the terminal pins. It is something. -Structure of the Invention The present invention provides a method of embedding a plurality of terminal pins in one end surface of a coil winding frame, connecting a coil lead wire to the terminal pins, and connecting the terminal pins to the same end surface of the winding frame as the end face on which the terminal pins are provided. , provide a dowel formed integrally with the winding frame, apply metal plating to this dowel, and when installing the transformer to the printed circuit board, insert the terminal pins and dowels into the holes provided in the printed circuit board, and attach these to the printed circuit board. It is fixed by soldering to the provided copper foil.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a perspective view of an embodiment of the winding frame of the present invention and an enlarged view of its essential parts. In the figure, 4 is the winding frame of the coil,
A plurality of terminal pins 6 are embedded in one end surface. A lead wire of a coil (not shown) wound around the winding frame is connected to this terminal pin 6. This terminal pin 6 is attached to the winding frame 4.
At the four corners of the same end face as
A dowel 13 of ~10 mm made of resin such as nylon, PPS, PBT, phenol, etc. is formed integrally with the winding frame 4,
Metal plating 1 such as copper or chrome is applied to the outer periphery of this dowel 13.
4 has been applied.

In order to attach a transformer incorporating such a winding frame 4 to a printed circuit board, as shown in FIGS. 2 and 3, the winding frame 4 is
The terminal pin 6 embedded in the hole lO provided in the printed circuit board 9
At the same time, insert the dowel 13 formed integrally with the winding frame into the hole 15 of the printed circuit board 9, and solder these terminal pins 6 and the plated dowel 13 to the copper foil 11 on the opposite side of the printed circuit board. Fix it at 12.

In addition, in the above-mentioned embodiment, the dowel 13. Although these are provided at the four corners of one end surface of the winding frame 4, they do not necessarily have to be provided at the four corners, and may be provided between a plurality of terminal pins 6.

Effects of the Invention In the conventional winding frame described with reference to FIGS. 4 to 6, the transformer is attached to the printed circuit board only by terminal pins embedded in the winding frame.

When an external impact is applied, the weight of the transformer is directly applied to the terminal pins, which causes the terminal pins to come out of the winding frame and lead wires to break. However, in the present invention, as described in the above embodiment, Since the dowel formed integrally with the winding frame is soldered to the printed circuit board, even if an external impact is applied, the force will not be applied to the terminal pin, and therefore the terminal pin will be released from the winding frame. It will not come off and breakage of the lead wire will be prevented. As a result, effects such as being able to use thinner lead wires and using a heavier transformer than in the past can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view and an enlarged view of essential parts of an embodiment of the winding frame of the transformer of the present invention, Fig. 2 is an explanatory diagram of the mounting operation for attaching the transformer of the present invention to a printed circuit board, and Fig. 3 is the present invention. 4 is an external perspective view of a conventional transformer, FIG. 5 is an exploded perspective view and partially enlarged sectional view of a conventional transformer, and FIG. 6 is a cross-sectional view of a conventional transformer. FIG. 3 is a side sectional view of a conventional example in which the holder is attached to a printed circuit board. 1...Transformer 2.3...Core 4...Reeling frame 5...Coil 6...Terminal pin 7...
Lead wire 9...Printed circuit board 11...Copper foil
12... Solder 13... Dowel 14... Name of metal plating agent Patent attorney Etsuji Yoshizaki 1st
Figure 3 Figure 4

Claims (1)

[Claims] A plurality of terminal pins for connecting the lead wires of the coil wound on the winding frame are embedded in one end face of the winding frame, and a dowel formed integrally with the winding frame is provided on the same end face as the terminal pins,
This transformer winding frame is characterized by metal plating on this dowel.