JPS5817527A - Coil bobbin with terminal - Google Patents

Abstract

PURPOSE:To prevent a terminal conductor from coming out by providing mutually complementary engaging parts on the sides of a coil bobbin and the terminal conductor. CONSTITUTION:Two parallel projecting pieces 7 and 7 are provided at the tip of a terminal conductor 5, and those projecting pieces 7 and 7 are fitted in an opening part 4a formed in the thick part 4 of a coil bobbin 1. Then, external force is applied to the projecting parts 7a and 7a of the projecting pieces 7 and 7 to spread the pieces outward, and thus a complete coupling state is obtained to prevent the conductor from coming out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coil bobbin with a terminal, and more particularly to a coil bobbin with a terminal that has an improved structure for connecting a separately molded coil bobbin and a terminal conductor.

2. Description of the Related Art Conventionally, coil bobbins have been known in which a billion coil bobbins and terminal conductors are fitted onto a core piece of a magnetic head or the like. Figures 1 and 2 (the two shown are two of the conventional structure)
It shows two examples. In the example shown in FIG. A plate-shaped terminal conductor 5 is insert-molded.

Further, in the example shown in FIG. 2, a round bar-shaped terminal conductor 6 formed in an L-shape C is similarly inserted into the thick portion 4 through its bent portion.

However, if such an insert molding method is adopted, the terminal conductors 5 and 6 are soldered one by one during molding.
There were problems of increased costs and poor productivity.

Many bottles have been proposed.

However, unlike insert molding, conventional bonding structures are difficult to prevent from being removed from the coil bobbin after the terminal conductor is bonded, and it is also difficult to maintain mechanical strength, resulting in an extremely complex structure and high cost.

Recently, with the advent of compact devices such as micro cassette tape recorders and mini cassette tape recorders, there has been a demand for smaller magnetic heads, and in order to reduce the size of pobbin terminals, the removal of the terminal conductor has been stopped and strength has been maintained. As the difficulty of connecting terminal conductors increases, there is a need for a connection structure for terminal conductors that has a reliable structure to prevent disconnection.

The present invention has been made in response to the above-mentioned demands, and an object of the present invention is to provide a coil pobbin with a terminal that has a coupling structure that can prevent the terminal conductor from being pulled out with an extremely simple structure.

In order to achieve the above object, in the present invention, complementary retaining parts are provided on the coil pobin side and the terminal conductor side, and both retaining parts are engaged to apply an external force to either one of the retaining parts. We adopted a structure that allows a reliable bonding state to be obtained by adding

Hereinafter, the present invention will be described in detail along with embodiments shown in the drawings.

Figure 3 and subsequent figures show some embodiments of the present invention. In each figure, the same or corresponding parts as in Figures 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. .

In the embodiment shown in FIGS. 3 and 4, the terminal conductor 5
Two parallel protrusions 7, 7 are provided protruding from the tip of the coil pobin 1, and these protrusions 7, 7 are inserted into the opening 4a formed in the thick part 4 of the coil pobbin 1 as shown in FIG. After the projections 7, 7 are fitted, the projections 7a, ? The structure is such that an external force is applied to a to push them outward to maintain a complete bond and prevent them from coming off.

In the embodiment shown in FIG. 5, hooks 7b are formed at the tips of the projecting pieces 7, 7, and when penetrating through the opening 4a, I: i! The projecting piece 7 receives force from the side wall of the opening 4a.
, 7 are elastically deformed in the direction of approaching each other under external force,
When the hook 7b comes out of the opening 4a, its own elasticity causes the protrusions 7, 7 to spread outward (2), and the hook 7b is locked to the outer surface of the thick part 4, so that the terminal conductor 5 are completely connected and prevented from coming off.

Both of the above two embodiments have protrusions, and after or during the penetration of these protrusions into the opening, an external force is applied to maintain the bonded state. The pieces 7, 1 and the opening 4a each form a complementary retaining part, and a reliable connection can be achieved.

In the embodiment shown in FIG. 6, a notch 4b is formed on the outside of the thick part 4 of the coil pobin 1 made of synthetic resin, and the vertical wall of the notch 4b is provided with, for example, a knurling. A processed pin 8 is provided protrudingly.On the other hand, a narrow portion 5a that can be fitted into the notch 4b is formed on the coil pobin 1 side of the terminal conductor 5, and this portion (: the pin 8
form a through hole 5b into which the pin 8 is fitted, and insert the pin 8 into the through hole 8b (
After the two are fitted together, the terminal conductor 5 is fixed by heat-setting the pin 8 from the outside of the terminal conductor 5. If such a structure is adopted, a reliable connection can be achieved and the terminal conductor 5 can be reliably prevented from coming off.

The embodiment shown in FIG. 7 is a modification of the embodiment shown in FIG. 6C in which the two parts are added together in an attempt to more reliably prevent removal. That is, step portions 4C are provided on the outside of the cutout portion 4b of the thick portion 4 of the coil bobbin, and a protruding portion is provided at the tip of the narrow portion 5a of the terminal conductor 5 to be engaged with the step portions 4C. 5C is formed.

Based on this structure, after the pin 8 is fitted into the through hole 5b of the terminal conductor 5, the pin 8 is fixed by hot caulking. In this example, the terminal conductor 5 has a protrusion 5C.
Therefore, a large external force is applied to the terminal conductor 5 in the direction of pulling it out, and the terminal conductor 5 does not come off.

FIG. 6 and FIG. 7 (=Example shown in FIG. 2) includes a narrow part 5a, a through hole 5b, a protruding part 5C, a notch 4b formed on the thick part 4 side, a pin 8, and a stepped part. 4C serves as a complementary engagement portion, completely preventing the terminal conductor from falling off.

In the embodiment shown in FIGS. 8 and 9, a notch 4d having a width approximately equal to the thickness of the terminal conductor 5 is provided across the center of the thick wall portion 4 of the coil bobbin. (−
1. Grooves 4f, 4f are provided on the outer surface of the thick portion 4, communicating with the notch 4d, and extending in the vertical direction while being shifted from the left and right C positions. On the other hand, a narrow portion 5a is provided at the end of the terminal conductor 5 connected to the coil bobbin, and a bent portion 5d facing in the opposite direction is provided at the tip thereof. Bending part 5d
The width of the groove 4f is approximately equal to the width of the groove 4f.

In such a structure, the narrow portion 5a of the terminal conductor 5 is formed into the groove 4d.
The coil bobbin is fitted into the groove 4f while elastically deforming the bent portion 5d to maintain a secure connection state of the coil bobbin.

If the terminal conductor 5 is connected in this way, it will not come off completely (- it will not come off. In the embodiment shown in FIGS. 4f are complementary holding parts.

As is clear from the above description, according to the present invention, the coil bobbin and the terminal conductor are connected to each other by providing two complementary retaining portions and applying an external force to either one after engaging each other. Despite the extremely simple structure, it is possible to achieve a secure bond that will not come off, and it is easy to assemble. (= There is no need to remove debris, etc. that occurs at the parting line (position of the die) during molding of the terminal conductor and bobbin, and there is no deterioration of the surface of the terminal conductor due to gas etc. during molding. Good soldering has many effects, including improved properties.

[Brief explanation of the drawing]

1 and 2 are perspective views showing different conventional structures, FIGS. 3 and 4 are perspective views and side views showing one embodiment of the present invention, and FIG. 5 is a perspective view showing different conventional structures. FIGS. 6 and 7 are exploded perspective views showing other embodiments of the present invention, and FIGS. 8 and 9 are side views showing different embodiments of the present invention.
FIG. 7 is a perspective view showing still another embodiment of the present invention and a perspective view of a terminal conductor.

Claims (1)

[Claims] Both ends of the coil bobbin (: The formed thick part for connecting the terminal conductor and one end of the terminal conductor are provided with complementary engaging parts to engage them, and either the coil bobbin or the terminal conductor side 1; A coil bobbin with a terminal characterized in that it is connected by applying an external force.