JPH0214187Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coil bobbin for small transformers such as indicator lights, and particularly relates to a structure to which a printed circuit board on which electronic components are mounted can be attached.

Conventionally, the primary voltage was reduced to 2 by an indicator light and a transformer.
The lamp was lit by lowering the voltage to the next lamp voltage, but with the recent development of light emitting diodes, light emitting diodes have been used instead of light bulbs.

However, the light emitting diode is a direct current, and in order to share it with a conventional transformer, it is necessary to attach a printed circuit board with electronic components that rectify the current to the transformer, as shown in Figure 1. The I-shaped iron core 1a and the E-shaped iron core 1b are formed in a substantially square shape in a through hole (not shown) provided in the coil bobbin 2 on which the secondary coil 3 is wound with the insulating wall 2a as the boundary. The central legs (not shown) of the E-type iron core 1b are inserted alternately from the left and right sides, and the printed circuit board 5 on which rectifying electronic components are mounted is placed between the flanges 2b and 2b' of the coil bobbin 2. Press the fitting pieces (not shown) of the lead-out metal fittings 6, 7 into the recesses (not shown) provided in the corners of the peripheral walls of the flanges 2b, 2b', and print the lead-out metal fittings 6, 7 with solder. The circuit board 5 is connected and fixed, and the electric wire 3a of the secondary coil 3 is wound around protrusions 5a provided on both sides of the printed circuit board 5 and fixed with solder. The connecting pieces 6b and 7b are respectively connected to a display device (not shown) having a display device (not shown), and the connecting pieces 6b and 7b are arranged to face each other.

However, with this method, vibrations and
When an impact is applied, the printed circuit board 5 vibrates and the protrusion 5
There is a risk that the electric wire fixed to a may be disconnected, and the electric wire 3a and the protruding piece 5a of the printed circuit board 5 may
Moreover, since the printed circuit board and the lead-out metal fittings 6 and 7 are fixed with solder, the assembly work is complicated.

This invention was proposed to improve the above-mentioned drawbacks, and aims to prevent wire breakage and simplify assembly work.

This invention will be explained below based on an embodiment shown in FIGS. 2 and 3. Components that are the same as those in FIG. 1 are indicated by the same symbols.

1 is a laminated core, which includes an I-type core 1a and an E-type core 1b.
It consists of an I-type core 1a and an E-type core 1b.
The center leg (not shown) of the iron core 1b is inserted alternately from left and right into a through hole (not shown) formed in the body of the coil bobbin 2 so as to form a shape, and is attached to the coil bobbin 2.

The coil bobbin 2 has an insulating wall 2 formed on the body.
A primary coil 4 and a secondary coil 3 are wound around a as a boundary, and the flanges 2b and 2b' on both sides are formed in a rectangular shape.
b' has notches 2d and 2 cut out in the peripheral wall.
d' is formed, and a recess 2c, which is connected to the notches 2d, 2d, on the peripheral wall on both sides of the notches 2d, 2d'.
2c, 2c', 2c' are formed, and the bottoms 2 of the notches 2d, 2d' are formed on the sides of the flanges 2b, 2b' on both sides.
Approximately square-shaped opening recesses 2f, 2f, 2f', and 2f' are formed from e and 2e' to the side surfaces of the flanges 2b and 2b', and the opening recess 2 on the secondary coil 3 side
f, 2f have substantially square-shaped connection terminals 10, 11, and lead pieces 10a, 11 formed on the connection terminals 10, 11.
The electric wires 3a and 3a' of the secondary coil 3 are wound around 11a and soldered to form lead pieces 10a and 11a.
are inserted with the two facing each other.

Reference numeral 5 denotes a printed circuit board, on which an electronic component 12 is mounted, and is provided with a circuit pattern and holes 5b, 5b' and 5c, 5c' corresponding to the electronic component 12, and lead pieces 10a, 11 of the connecting fittings 10, 11.
A is inserted into the holes 5b and 5b', and the connecting fitting 1 is disposed between the notches 2d and 2d' of the flanges 2b and 2b'.
The lead pieces 10a and 11a of 0 and 11 are electrically connected to the printed circuit board 5 by soldering.

6 and 7 are lead-out metal fittings, and the bases 6a and 7a have a connecting piece 6 connected to a display device (not shown) in the center.
b, 7b are formed, and fitting pieces 6c, 7b are formed on both sides.
6c', 7c, 7c' are formed.

The holding fittings 8, 9 are formed by bending both sides of the bases 8a, 9a inward to form holding parts 8c, 9c, and also have approximately .circle-shaped lead pieces 8b, 9b on one side.
The recesses 2c', 2c' of the collar part 2b' are opposed to the lead pieces 8b, 9b, and the holding parts 8c, 9c are attached.
are press-fitted, respectively, and the lead pieces 8b and 9b are
are inserted into the holes 5c, 5c' of the printed circuit board 5, respectively, and the lead pieces 8b, 9b and the printed circuit board 5 are electrically connected by soldering.

Then, one fitting piece 6c' of the lead-out fittings 6 and 7,
7c' is press-fitted into the holding parts 8c, 9c of the holding fittings 8, 9, and the other fitting pieces 6c, 7c are press-fitted into the recesses 2c, 2c of the opposing collar parts 2b.

At this time, the connecting pieces 6b and 7b are arranged so as to face each other, the laminated core 1 is housed in a case (not shown), and the connecting pieces 6b and 7b of the lead-out fittings 6 and 7 are connected to the display device (not shown). Connecting parts (not shown) are electrically connected to turn on the indicator light.

In this case, electrically the electronic component 12 → the holding fitting 9
→ Leading metal fitting 7 → Display device → Leading metal fitting 6 → Holding metal fitting 8 Connected to electronic component 12.

As described above, a recess is formed in the flange of the coil bobbin, a notch is formed between the recesses,
An opening recess is formed from the bottom of the notch to the side of the flange, a printed circuit board is placed in the notch, and each metal fitting is arranged in the recess and the opening recess to secure the printed circuit board. Even if vibrations and shocks are applied to the secondary coil, disconnection of the wire of the secondary coil can be prevented.

In addition, since the lead piece of the metal fitting is soldered to the printed circuit board, it is possible to omit the soldering work between the electric wire and the printed circuit board and the soldering work between the lead-out metal fitting and the printed circuit board, which makes the assembly work complicated. This has practical effects such as being able to eliminate problems and simplify assembly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is an exploded perspective view of an embodiment of this invention, and FIG. 3 is a perspective view showing the assembled state. 1... Laminated iron core, 2... Coil bobbin, 2a...
...Insulating wall, 2b, 2b'... Flange, 2c, 2c'...
Recess, 2d, 2d'...notch, 2e, 2e'...bottom, 2f, 2f'...opening recess, 3...secondary coil, 4...primary coil, 5...print substrate,
5b, 5b', 5c, 5c'... Hole, 6, 7... Lead-out fitting, 6a, 7a... Base, 6b, 7b... Connection piece, 6c, 6c', 7c, 7c'... Fitting piece ,8,9
...Holding metal fittings, 8a, 9a...Base, 8b, 9b
...Lead piece, 8c, 9c...Holding part, 10,1
1... Connection fittings, 10a, 11a... Lead pieces,
12...Electronic parts.

Claims (1)

[Scope of Claim for Utility Model Registration] In a coil bobbin for a transformer in which a primary coil and a secondary coil are wound and a laminated core is attached, a part of the peripheral wall of a flange formed on both sides of the coil bobbin is cut out. forming a notch, and forming a recess in a peripheral wall on both sides of the notch, forming an opening recess connected to the notch in a side surface of the at least one flange, and inserting a secondary coil into the opening recess. A printed circuit board into which the connecting fittings to be connected are fitted and electronic components mounted in the notches on both sides is arranged so as to electrically connect the electronic components and the lead pieces formed on the connecting fittings. , A holding fitting is provided in a recess in a flange on the opposite side of the connecting fitting side to electrically connect a lead piece formed on the holding fitting to the electronic component, and a holding fitting is attached to the holding fitting. The formed holding portion is press-fitted into the recess, and a connecting piece electrically connected to the display device is formed in the center, and a lead-out fitting having fitting pieces formed on both sides is attached to the flanges on both sides. The fitting piece is press-fitted into the holding part of the holding fitting, and the other fitting piece is press-fitted into the recess of the flange on the side of the connecting fitting. Coil bobbin for transformers.