JPH01119007A - Small coil - Google Patents

Abstract

PURPOSE:To facilitate assembly and handling and to reduce the number of processing steps by housing a toroidal coil in a protective case with pin terminals comprising an opened groove on top of the case, a small projected strip being disposed at the bottom of such opened groove to block the coil from moving, and at least 2 pairs of pin terminals being embedded on the case bottom. CONSTITUTION:An opened groove 42 having dimensions sufficiently deep and wide to house a toroidal coil is formed on top of an insulating protective case 41, the two opposed plates forming such opened groove 42 comprise a small projected strip 44 to block the insulating protective case 41 and the housed coil from moving, said insulating protective case 41 having at least a pair of positioning strips 47 with tapered parts. The toroidal coil 1 is vertically housed in the insulating protective case 41 with bin terminals, the winding terminals of winding materials 12 are pulled and wound on a guide groove 45 as the materials 12 come out. At this point, a gap between the thickness of the toroidal coil 1 and the distance of the opposed positioning strips 47, as well as a gap between the diameter of the coil 1 and the distance of the small projected strips 44 opposed between both ends of the opened groove 42 can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small common mode choke coil housed in a protective case made of electrically insulating material.

[Conventional technology]

Conventionally, this type of small coil is explained by using a toroidal coil as an example. In electronic devices, many toroidal coils with magnetic core 11 as a magnetic core are used as data line filters for signal lines. .

As shown in Fig. 2, the structure is as shown in Fig. 2. A coated electric annealed copper wire is wound around a magnetic core 11 multiple times as a winding material 12, and its terminals are pre-soldered, stretched and attached directly to a circuit board, and then glued with adhesive. The coil is used by fixing it to the board with etc.

Further, the toroidal coil shown in FIG. 2 is housed in an insulating case with pin terminals as shown in FIGS. 4 and 5.

[Problem that the invention seeks to solve]

Conventionally, this type of toroidal coil usually uses a small-diameter ferrite core with a diameter of 10 to 3 m/m and a thickness of 5 to in/m, and the thickness of the winding material is
For example, a coated electrical annealed copper wire as thin as about 0.1 to 0.3 m/m is used.

Therefore, when directly attaching to a circuit board, the extended wire-wound terminal is easily deformed, and it is extremely difficult to attach it in a predetermined direction and position while maintaining dimensional accuracy.
The magnetic core of the coil was also a difficult and troublesome electronic component to handle, as it was weak against external forces and easily cracked.

In addition, in cases where the coil is housed and supplied in a case with a pin terminal as shown in Figures 4 and 5, the small coil is housed in the case and can be protected from external pressure and kept in place. This was achieved by simply connecting the winding terminal to the buried bottle terminal.

However, in a small coil using the case shown in Figure 5,
Due to its structure, it has disadvantages such as a large increase in material costs and processing costs.

[Means for solving problems]

The present invention has an opening groove for storing a toroidal coil on the upper surface of a protective case with a pin terminal made of an electrically insulating material, and the height of the case body on two opposing sides that contact the opening groove is higher than the toroidal coil. , one of the two opposing sides is provided with a small protrusion on the bottom surface of the opening groove to prevent the movement of the coil, and at least two pairs of pin terminals are embedded in the bottom surface of the case, A small toroidal coil is housed in a protective case with a bottle terminal, which has a guide groove extending vertically from the opening groove toward the bottle terminal. , soldering is used to connect and provide a small coil that solves the above-mentioned problems.

〔Example〕

Figure 2 shows a conventionally used toroidal coil.
FIG. 4 and FIG. 5 show external perspective views of conventional small coils with pin terminals.

FIG. 1 is an external perspective view of a small coil case showing an embodiment of the present invention.

FIG. 3 is a perspective view showing a small coil of the present invention in which a toroidal coil is mounted in the case of FIG.

In FIG. 1, the insulation protective case 41 is made of polybutylene.
It is made of electrically insulating resin such as terephthalate, phenol, and epoxy resin, and its external dimensions are, for example, 7. OX6.
It has a small rectangular shape with an OX height of 8.3 m/at, and the bottom is made of hard copper wire of 0.5 to 0.7 m/mφ, or a bottle made of solder-plated copper-plated steel wire. For example, 2.54 x 5.08 m/m or 2.54 x 5.08 m/m.
5X 5. At least four of them are planted at a dimensional pitch that matches the circuit board basic grid pitch of On/m.

An opening groove 42 having a depth and two width dimensions sufficient to accommodate the toroidal coil is formed on the upper surface of the insulating protection case 41, and the two opposing sides forming the opening groove 42 are A small protruding piece 44 is provided to prevent movement of the insulating protective case 41 and the stored coil, and the insulating protective case 41 is provided with a positioning plate 47 having at least a pair of tapered portions in the center thereof. It is being

Further, on the bottom surface of the case, there are planted pin terminals 48 which are planted at a predetermined pitch, and a guide groove 45 which is vertically provided from the opening groove 42 toward the pin terminal 48 and the pin terminal 48
A protrusion 46 is integrally provided in the center of the pin terminal and protrudes toward the pin terminal in order to protect the wire winding on the pin in the direction in which the pin terminal is pulled out.

A toroidal coil 1 as shown in FIG. 2 is housed vertically in such an insulated protective case 41 with a pin terminal,
The ends of each winding are routed through the guide groove 45 while keeping the direction in which the winding material 12 is led out. At this time, toroidal coil 1
The gap between the thickness of the coil 1 and the gap between the opposing positioning state agency 47 and the gap between the diameter of the coil 1 and the gap between the small protrusions 44 facing on both sides of the opening groove 42 are small. By selecting the dimensions so that the coil and magnetic core do not move, it is possible to construct a transformer or coil that can be fixed without using adhesive, etc., and the winding terminal is connected to the pin terminal 48. , a small coil can be obtained by soldering and connecting.

FIG. 3 is a perspective view when the coil is housed in the insulating protection case with a bin terminal shown in FIG. 1, and the winding end is tied to the bin terminal to form a small coil of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, the small coil according to the present invention can be fixed to an insulating case without using an adhesive or the like, and the end of the winding material can be kept in the direction in which the winding material is led out.
It can be easily routed without the need for special terminal molding and routing, and can be connected to pin terminals.

Furthermore, when the small coil according to the present invention is mounted on a board, it can be handled without directly touching the coil, and since the case structure is a sturdy rectangular case, the mounting on the board can be easily automated. This protects the coil from external pressure.

Therefore, it has a simple structure and is housed in a protective case with pin terminals that doubles as a sturdy lid and case body, making it easy to assemble.
It is easy to handle, greatly reduces the number of man-hours required, and makes it possible to provide a small coil that is inexpensive, stable in quality, and excellent in mass production.

Margin below

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an insulating protective case with a pin terminal used for a small coil according to the present invention. Figure 2 shows a conventionally used small toroidal coil. FIG. 3 is an external perspective view of a small coil according to the present invention. FIG. 4 and FIG. 5 are external perspective views of a conventional small coil with a pin terminal. 1... Toroidal coil. 11...Magnetic core. 12...Winding material. 21...Case. 22... Lid. 41... Insulation protection case. 42... Opening groove. 44...Small protrusion. 45...Guide groove. 46... Protrusion. 47...Positioning tail piece. 48...Pin terminal. Patent applicant: Tohoku Metal Industry Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] The upper surface of a protective case with a pin terminal made of electrically insulating material has an opening groove for storing a toroidal coil, and the height of the case body on two opposing sides touching the opening groove is higher than the coil, and the height of the other two sides is higher than that of the coil. A protrusion with a minimum height sufficient to stop the movement of the coil is provided at the bottom of the opening groove, and at least two pairs of pin terminals are embedded in the bottom of the case, and a protrusion is provided from the opening groove toward the pin terminal. The toroidal coil is housed in the opening groove of the protective case with a pin terminal, and the winding ends are routed along the guide groove and connected to the pin terminal by soldering. A small coil characterized by: