JPH0521233A - Toroid device - Google Patents

Abstract

PURPOSE:To acquire and inexpensive device which can be automatically assembled by using an automatic inserting device and of which number of assemblies can be reduced by providing it with a toroidal core, a specified printed wiring substrate and an insulating type jumper resistance. CONSTITUTION:A device is provided with a toroidal core 1, conductive patterns 5, 6 whereto the core 1 is attached and which has lands 5a, 6a positioned at an area near the attached toroidal core 1 and a printed wiring substrate 3 which is provided with a number of through-holes 7, 8 positioned inside the lands 5a, 6a. In the device, a bendable rod-like conductor 12 is made to pass through an insulator 11, the insulator 11 is brought into contact with the toroidal core 1, both end parts of the conductor 2 which are made to pass through the through-holes 7, 8 are electrically connected with the lands 5a, 6a and attached to the printed wiring substrate 3, and a number of insulation type jumper resistances 9, 10 are provided which form a coil which surrounds the toroidal core 1 together with the conductive patterns 5, 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroid (closed magnetic circuit) device used as, for example, a transformer or a noise filter of electric equipment.

[0002]

2. Description of the Related Art A toroid device which does not require the work of winding a coil around a toroidal core is known in Japanese Utility Model Laid-Open No. 61-42810.

That is, in the technique described in this publication, a toroidal core is placed on a printed wiring board, and a plurality of conductors curved in a substantially U shape are externally fitted to the body of the core. The ends of both legs of the conductor are electrically connected to a conductive pattern formed on the printed wiring board.The conductor and the conductive pattern form a spiral current path around the outer circumference of the toroidal core body, that is, a coil. Is composed of.

[0004]

However, in the prior art, a plurality of conductors are integrally connected at a predetermined interval via a bridge portion before being attached, and the bridge portion is connected to a printed wiring board. It is cut after the attachment to make the plurality of conductors independent. Therefore, at the time of the cutting, to prevent damage to the toroidal core,
In addition, since it is necessary to insulate the toroidal core from the conductor, all surfaces of the toroidal core other than the surface in contact with the printed wiring board are covered with the resin insulator.

As described above, in the conventional device, it is necessary to cover the toroidal core with the resin insulating material in advance, and also it is necessary to disconnect the bridge portion after attaching the conductor to the printed wiring board. .. Therefore, there is a problem that the number of steps required for assembly is large.

In addition, the plurality of conductors integrally connected by the bridge portion are inserted and attached to the printed wiring board so as to cover the toroidal core while leaving both ends thereof bent in advance. .. Therefore, in order to automate this insertion, a dedicated automatic machine designed to be able to handle a plurality of conductors integrally connected by the bridge part is required, and the horizontal resistance already provided is available. It was not possible to perform the work of attaching the conductor using the automatic inserter for the vessel and the diode. An object of the present invention is to obtain an inexpensive toroid device which can reduce the number of assembling steps and can be automatically assembled by using an automatic insertion machine.

[0007]

In order to achieve the above object, the toroid device of the present invention has a toroidal core and a land to which the core is attached and which is located in the vicinity of the attached toroidal core. A printed wiring board provided with a conductive pattern and a large number of through holes located in the land, and a pierceable rod-shaped conductor passing through an insulator, and the insulator is brought into contact with the toroidal core. A plurality of insulated jumper resistors that are electrically connected to the land at both ends of the conductor passed through the through hole and are attached to the printed circuit board to form a coil surrounding the toroidal core together with the conductive pattern. It is equipped with and.

[0008]

In the above structure, the many insulating jumper resistors that form the coil together with the printed wiring board have their insulators abutted on the toroidal core, and both ends of the conductor are connected to the through holes of the printed circuit board. Attached to this circuit board. By the way, the insulation type jumper resistor is a well-known horizontal electric component (that is, an electric component in which lead terminals are laterally projected from both ends) and is generally commercially available. Therefore, this jumper resistor can be automatically inserted into the printed wiring board by using an existing automatic insertion device for horizontal resistors and diodes. The insulator of each jumper resistor attached to the printed wiring board prevents short-circuiting between the conductors of the adjacent jumper resistors and also prevents short-circuiting between the conductor and the toroidal core. Place them at regular intervals.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 is a toroidal core. As shown in FIGS. 1 and 2, the core 1 includes a pair of opposing coil mounting portions 1a and 1b and these mounting portions 1a and 1a.
It has a pair of connecting portions 1c that are opposed to each other by integrally connecting the ends of 1b, and is formed in a rectangular frame shape. Boss-like convex portions 2 (see FIGS. 3 and 4) are integrally formed on the lower surfaces of the central portions in the longitudinal direction of the connecting portions 1c.

The toroidal core 1 is attached to the surface of the printed wiring board 3 with an adhesive (not shown). The printed wiring board 3 has a pair of holes 4 as shown in FIGS. 3 and 4. The toroidal core 1 is positioned on the printed wiring board 3 by fitting the protrusions 2 into the holes 4. Note that this positioning may be performed by providing the toroidal core 1 with the hole 4 and providing the printed wiring board 3 with the convex portion 2 to be fitted therein.

A large number of conductive patterns 5 and 6 are provided on the back surface of the printed wiring board 3 as shown in FIG. The conductive pattern 5 group is formed corresponding to one coil mounting portion 1a, and the lands 5a which each conductive pattern 5 has at the end thereof are respectively connected to the one coil mounting portion 1a.
It is located in the vicinity of a so as to sandwich it. Similarly, the group of conductive patterns 6 is formed corresponding to the other coil mounting portion 1b, and the lands 6a that each conductive pattern 6 has at the end thereof respectively have the other coil mounting portion 1b.
It is located in the vicinity of b so as to sandwich it.

On the printed wiring board 3, a large number of through holes 7 are separately formed in each land 5a, and a large number of through holes 8 are separately formed in each land 6a. It has been opened.

On the printed wiring board 3, a large number of insulating jumper resistors 9 that form a primary coil together with the conductive patterns 5 and a large number of insulating jumper resistors that form a secondary coil together with the conductive patterns 6 group. 10
Is installed. That is, as shown in FIGS. 1 and 3, these jumper resistors 9 and 10 are formed by penetrating a rod-shaped conductor 12 through a cylindrical insulator 11, and the conductor 12 is bendable and insulated. Both ends protruding from the object 11 are used as lead terminals.

These jumper resistors 9 and 10 are passed through the through holes 7 or 8 at both ends thereof, bent as shown in FIG. 3, and then electrically connected to the lands 5a or 6a by soldering. , Mounted on the printed wiring board 3. By the attachment, the coil on the primary side composed of the conductive pattern group 5 and the large number of insulating jumper resistors 9 forms a spiral current circuit around the first coil attachment portion 1a of the toroidal core 1. Similarly, the coil on the secondary side composed of the conductive pattern group 6 and the large number of insulating jumper resistors 10 forms a spiral current circuit around the second coil attachment portion 1 b of the toroidal core 1.

The toroid device having the structure described above is used, for example, as a transformer for electric equipment. In this toroid device, the insulator 11 of each jumper resistor 9, 10 mounted on the printed wiring board 3 across each coil mounting portion 1a, 1b of the toroidal core 1 is the conductor of each adjacent jumper resistor 9. 12 and the conductors 12 of the adjacent jumper resistors 10 are prevented from being short-circuited with each other, and the conductor 12 and the toroidal core 1 are prevented from being short-circuited with each other to prevent the jumper resistors 9 from each other and the shampers. The resistors 10 are arranged at regular intervals.

Therefore, it is not necessary to cover each outer surface of the coil 1 other than the surface in contact with the printed wiring board 3 with the resin insulating material in order to prevent a short circuit between the respective parts, and the steps therefor can be omitted. Moreover, each jumper resistance 9,1
Since 0 is independent in advance, a cutting process is not required for assembling the toroid device. In this way, according to the configuration of the toroid device, the number of assembling steps is small, and therefore the toroid device can be easily assembled.

Moreover, since each of the insulation type jumper resistors 9 and 10 used for forming the coil can use a horizontal electric component which is generally commercially available, a specially designed automatic insertion machine is unnecessary, Jumper resistors 9 and 10 can be automatically inserted into the printed wiring board 3 by using a horizontal resistor or an automatic inserter for a diode.

That is, each insulation type jumper resistor 9, 1
0 is a state in which the conductor 12 extends in the axial direction of the insulator 11 as shown in FIGS. 5 and 6, and the left and right adhesive tapes 13 are provided so as to sandwich the tip end of the conductor 12 from both sides in the radial direction. The parts of the jumper resistors 9 and 10 in the form of strips are aligned and connected, and the strips of the jumper resistors 9 and 10 are set in the axial automatic insertion machine in a state of being wound or folded. Therefore, this automatic insertion machine has a jumper resistor 9 or 1 from the adhesive tape 13 inside.
0 is separated, and both ends of the conductor 12 are bent and inserted into the printed wiring board 3 so that the whole shape becomes a substantially U shape.

Therefore, the facility cost can be reduced, the assembling is easy, and the amount of the insulator 11 of each jumper resistor 9 and 10 to be used is also compared with that when the toroidal core 1 is covered with the resin insulator. Since a small amount is required, the toroid device can be obtained at low cost.

Of course, the automatic insertion technique of the horizontal electric component described above is already known, and therefore, another horizontal electric component to be mounted on the printed wiring board 3 is assembled in a predetermined position in advance in the component band. By placing them in a crowded manner, the required horizontal electric components can be automatically inserted into the printed circuit board 3 one after another.

[0021]

As described in detail above, according to the toroidal device of the present invention, a large number of insulating jumper resistors are attached to a printed wiring board, and a coil is formed together with the conductive pattern of the board so that the jumper resistance is Since the insulator provided prevents short circuits between the conductors of the adjacent jumper resistors and between the conductor and the toroidal core,
Since it is not necessary to coat the outer surface of the coil with a resin insulator, and the respective jumper resistors are independent in advance and therefore need not be cut, the number of assembling steps can be reduced, and the coil can be easily assembled. In addition, since a commercially available lateral electric component can be used for the insulating jumper resistor, the jumper resistor can be automatically inserted into the printed wiring board by using the automatic insertion machine. Therefore, the facility cost can be reduced, and as described above, the resin insulator that covers the outer surface of the coil can be omitted and assembled easily, so that the cost can be obtained at a low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a toroid device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the toroid device of the same embodiment.

FIG. 3 is a sectional view showing the toroidal device of the embodiment along line ZZ in FIG.

FIG. 4 is a rear view of a part of the printed wiring board included in the toroid device of the embodiment.

FIG. 5 is a plan view showing a state in which a jumper resistor is supported by an adhesive tape according to the embodiment.

6 is a cross-sectional view taken along line YY of FIG. 5 according to the embodiment.

[Explanation of symbols]

1 ... Toroidal core, 3 ... Printed wiring board, 5, 6 ...
Conductive pattern, 5a, 6a ... Land, 7, 8 ... Through hole,
9, 10 ... Jumper resistance, 11 ... Insulator, 12 ... Conductor.

Claims (1)

Claim: What is claimed is: 1. A toroidal core, a conductive pattern having a land attached to the toroidal core, the land located near the attached toroidal core, and a through hole located in the land. A large number of printed wiring boards and insulating rods that penetrate bendable rod-shaped conductors are passed through, and the insulators are brought into contact with the toroidal core, and both ends of the conductors that are passed through the through holes. Is electrically connected to the land, is attached to the printed circuit board, and includes a plurality of insulating jumper resistors that form a coil surrounding the toroidal core together with the conductive pattern.