JPS61102712A - Chip type coil element - Google Patents

Abstract

PURPOSE:To eliminate the deformation of the surface, to which a core is mounted, completely, and to fit the core firmly by forming a terminal board by nickel silver. CONSTITUTION:A core 1 consists of ferrite having excellent high-frequency characteristics and large mechanical strength, a recessed section on which a coil is wound is shaped to the side surface of the core, the core 1 is manufactured by cutting a columnar ferrite sintering body, and the core 1 is formed to a hand drum shape that the recessed section is formed to the side surface. The core 1 on which the coil 2 is wound is mounted onto a pair of terminal boards 3a, 3b through an adhesive material composed of an epoxy resin, etc., and both tips of a polyurethane coated copper wire constituting the coil 2 are each brazed to the terminal boards 3a, 3b through a solder material such as solder. The terminal boards 3a, 3b consist of nickel silver as an alloy of copper- nickel-zinc, and function as an electrical connection to an external circuit of the coil 2. Accordingly, the core can be fitted firmly to the surfaces of the terminal boards, thus acquiring a chip type coil element having extremely high quality and reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in chip-type coil elements.

(Prior art) In recent years, with the development of semiconductor devices, electronic devices and electronic circuits have rapidly become smaller and thinner, and the coil elements that make up the electronic circuits have also become smaller and chip-shaped. is being attempted.

A conventional chip-type coil element has a core made of ferrite, a coil made of many turns of polyurethane-coated copper wire,
It consists of a pair of terminal plates for electrically connecting the coil to an external circuit, and the chip-type coil element is formed by winding a large number of polyurethane-coated copper wires around the outer periphery of a core made of ferrite to form a coil. It is fabricated by attaching the core around which the coil is wound onto a pair of flat terminal plates using an adhesive, and then brazing the ends of the polyurethane-coated copper wire that forms the coil to the terminal plates. .

(Problems to be Solved by the Invention) However, in this conventional chip-type coil element, the terminal plate is usually made of steel, which is a non-magnetic material, in order to prevent the Q characteristic of the coil from deteriorating. The yield point of the copper is 6.0 k
Since it has a low g/n and is extremely soft, when manufacturing chip-type coil elements using an automatic machine, if the terminal plate is fed into the automatic machine in a hoop shape, the surface to which the core of the terminal plate is attached will be This has the disadvantage that the core is largely deformed and the core cannot be securely attached to the terminal board.

In addition, since the bonding strength between the core and the terminal plate of this conventional chip-type coil element is weak, when an external force is applied to the terminal plate when joining the chip-type coil element to an external circuit, the external force causes the core to connect to the terminal plate. One piece easily came off the board,
As a result, the electrical connection between the coil wound around the outer periphery of the core and the terminal plate may become disconnected, resulting in disconnection or poor contact, which is a serious drawback in that it impairs the function of the chip-type coil element. provoke.

(Purpose of the Invention) In view of the above-mentioned drawback 1, the present invention has been made through various experiments, and it has been found that when nickel silver is used as the terminal plate of the chip-type film diode, the Q characteristic of the coil does not deteriorate significantly, and the hoop-shaped It has been found that even if the core is supplied to an automatic machine, the surface to which the core is attached is not deformed at all, and the core can be firmly attached.

The present invention is based on the knowledge described in L, and the coil has a high Q characteristic, and the attachment strength between the core and the terminal plate is extremely high, without any possibility of the core coming off from the terminal plate, which would impede the function of the coil. The object of the present invention is to provide a chip-type coil element.

(Means for Solving the Problems) The present invention provides a chip-type coil element 1 comprising a pair of terminal plates attached to a core around which a coil is wound, and the terminal plates are made of nickel silver. It is characterized by:

(Example) Next, the present invention will be explained in detail based on the example shown in FIGS. 1 and 2.

FIG. 1 shows an embodiment of the chip-type coil element of the present invention, in which 1 is a core, 2 is a coil, and 3a and 3b are terminal plates.

The core 1 is made of ferrite with good high-frequency characteristics and high mechanical strength, and has a recess on its side surface for winding the coil. It is cut using a conventionally known cutting method to form a drum-shaped IC having a concave portion on the side surface.

The core 1 has a diameter of about 0.03~0°1 in its side recess.
A large number of 5ffφ polyurethane-coated copper wires are wound, and the coil 2 is formed by winding the polyurethane coating w4m.

The number of turns of the Cocoil 2 polyurethane coated copper wire determines its inductance, and the number of turns of the coil 2 (the number of turns of the polyurethane coated copper wire) is determined according to the desired inductance of the chip type coil element. be done.

The thickness of the polyurethane-coated copper wire constituting the coil 2 is determined by the desired inductance of the chip-type coil element, that is, the number of turns of the coil 2. Since the number of turns of coil 2 is large, a thin polyurethane-coated copper wire is used, and in the case of a chip-type coil element with a small inductance, the number of turns of coil 2 is small, so a thick polyurethane-coated copper wire is used. things are used.

The coil 2 is formed by winding a large number of polyurethane-coated copper wires into the recessed portion of the side surface of the core 1 using a conventionally known flyer method or spindle method.

The core 1, around which the coil 2 is wound, has a pair of terminal plates 3a, 31 whose bottom surfaces are arranged in a flat manner with a constant interval between them.
), and both ends of the terminal plates 3a, 3b and 4ts covered with polyurethane, which constitute the coil 2, are respectively brazed with solder or other brazing material. .

The pair of terminal plates 3a and 3b are connected to Ic as shown in FIG.
The lead frame 4 is integrally formed with the lead frame 4, and after the core 1 is attached to the upper surface, it is cut and separated from the lead frame 4 along the dotted line A.

The terminal plates 3a and 3b are made of copper-27 Kel-zinc alloy (0
11-Nl-Zn alloy), and serves to electrically connect the coil 2 to an external circuit. The nickel silver forming the terminal plates 3a and 3b is soft and has a yield point of 1.
5-30 kg/rm and copper (yield point 260 kg
/IIM) is superior in processability such as punching, and when supplied to an automatic machine, even if it is made into a hoop shape, the surface to which the core 1 is attached (-) will not be deformed. Therefore, the surfaces of the pair of terminal plates 3a and 3b to which the core 1 is attached are always flat, and the bonding area with the core 1 is large, so the core 1 is firmly attached to the upper surface. Even if an external force is applied to the terminal plates 3a, 3b when the chip-type coil element is connected to an external circuit, the core 1 will not come off the terminal plates 3a, 3b due to the external force, and the coil 2 and the terminal board 3a.

3b will not be disconnected electrically.

Although the nickel silver forming the terminal plates 3a and 3b contains nickel (N1), which is a 1c magnetic material, in its alloy, it can be made into a non-magnetic material by reducing the content of nickel. , terminal plate 3a.

3b, it does not significantly reduce the Q characteristic of the coil.

The core l around which the coil 2 is wound has a pair of terminal plates 3a,
3b, its outer periphery is mixed with ferrite powder by the well-known trans-molding method. J
The coil 2 and core 1 are completely shielded from external magnetism by being molded with oil to complete a chip-type coil element as a final product.

(Effects of the Invention) Thus, the chip-type coil element 1 of the present invention is characterized in that the pair of terminal plates to which the core around which the coil is wound is attached are made of nickel silver, which is a non-magnetic material and has a high yield point. Q of the coil from
When manufacturing chip-type coil elements using automatic machines, the surface on which the core is attached is always one flat surface, even if the terminal plate is formed into a hoop shape. , it becomes possible to firmly attach the core to the surface of the terminal plate, and a chip-type coil element of extremely high quality and reliability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the chip-type coil element of the present invention, and FIG. 2 is an exploded perspective view of the chip-type coil element of FIG. 1. 1: Core 2: Coil 3a, 3b: Terminal board

Claims (1)

[Claims] What is claimed is: 1. A chip-type coil element comprising a core wound with a coil attached to a pair of terminal plates, wherein the terminal plates are made of nickel silver.