JPH0623168Y2 - Air core ribbon coil terminal connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a conductive thin strip which is used as a drive coil of a motor in which a plurality of trapezoidal coils are combined to form a drive coil. The present invention relates to an air-core ribbon coil terminal connecting device for soldering and connecting terminals of an air-core ribbon coil wound around a core coil to a board and attaching the air-core ribbon coil to the board.

[Conventional technology]

As a conventional terminal connecting device for this type of air-core ribbon coil, the device shown in FIGS. 7 to 12 has been used.

7 and 8 shows a substrate in which the end 21a of the coil 21 and the beginning 21b of the coil 21 which are previously drawn out from the coil 21 are used as terminals after the end face of the coil 21 is adhered onto the substrate 3 with an adhesive. The circuit pattern 3a of No. 3 is soldered 23.

9 and 10, the circuit pattern 3a of the substrate 3 is formed at the winding end and the winding start portion of the coil 21, and the coil 21 can be removed without pulling the winding end from the coil 21. This is so-called direct bonding in which the circuit pattern 3a and the coil 21 are directly wound and soldered at the winding end 23 after they are bonded to the substrate 3 with an adhesive.

11 and 12, the coil 21 has soldered pins 22 bent in an L-shape with respect to the circuit pattern 3a of the substrate 3 at positions where the winding end and the winding start coincide with each other. 21 is adhered to the substrate 3, and the winding and the winding start of the pin 22 and the coil 21 are soldered 23.

The solder 23 has a pin 22 and a coil 2 by laser welding.
One connection may be made.

[Problems to be solved by the invention]

In the above-described air core ribbon coil terminal connecting device, since the connecting portion between the terminal at the end of winding and the substrate pattern is located outside the outer shape of the coil, even if the outer shape of the coil is reduced, the soldered portion The occupying area of the coil including that could not be reduced so much.

Further, soldering is performed manually at two positions, the end of winding and the beginning of winding, so that there is a drawback that the soldering time becomes long and the work cannot be automated.

[Purpose of device]

The present invention is intended to eliminate the above-mentioned drawbacks of the conventional air core ribbon coil terminal connecting device, in which the terminal and the circuit pattern are connected within the outer shape of the coil to reduce the area occupied by the coil including the connection area. Measure the decrease and do not increase the total thickness including the coil thickness.

By standardizing the terminals of the coil, the coil can be made into a chip component so that the mounting and connecting work to the substrate can be automated and the working time can be shortened.

[Outline of device]

In order to achieve the above-mentioned object, the present invention standardizes the coil by adhering the winding end and winding start end of the air-core ribbon coil to the coil end surface, and the terminal formed at the winding end and winding start is formed. The gist is to connect to the substrate at the air core of the coil.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 is an air-core ribbon coil in which a ribbon-shaped conductive ribbon is wound with an adhesive insulating layer interposed between winding layers, and an insulating layer is formed on an end face thereof. The winding end 1a, winding start 1b Is the one that has been pulled out beforehand, and this air core ribbon coil 1
An example of the manufacturing method will be described later.

The winding end 1a is bent in a shape such that it is folded back from the outer periphery of the coil 1, is guided to the end surface of the coil, and is adhered to the end surface with an adhesive 2 and then passes through the air-core portion of the coil 1 and the end surface on the opposite side. The end portion is adhered to the top with an adhesive 2. Here, the adhesive includes a pressure sensitive adhesive, a pressure sensitive adhesive and the like.

The winding start 1b is bent so as to pass through the air-core portion of the coil 1 from a predetermined position on the inner shape of the coil 1, and the end portion of the winding 1b is lined with the end portion of the coil 1 with an adhesive 2 at the end portion. The coil 1 is adhered to the end face of the coil 1 and is shaped including the terminals formed at the winding end 1a and the winding start 1b.

If the insulating layer formed on the end surface of the coil 1 is thick and is made of a heat-softening polyamide-based material, fusible polyurethane, or the like, the adhesive 2 is not necessary, but generally the thickness of the coil 1 is reduced. In order to achieve this, when this insulating layer is thin, or when a thermosetting phenol type, epoxy type, or the like is used, the insulation with the conductive ribbon of the coil 1 is secured, or the adhesive 2 is used for adhesion. Will be needed.

From the viewpoint of workability, an adhesive having an insulating property is preferable as the adhesive 2.

On the other hand, the substrate 3 is formed so that the circuit pattern 3a is exposed at the position of the air core of the coil 1 when the coil 1 is attached, and the end surface of the coil 1 is covered with the resist 3b.

The adhesive 4 is applied to a portion of the substrate 3 where the end surface of the coil 1 is located by a dispenser, a printing machine or the like, and the cream solder 5 is applied to the exposed portion of the circuit pattern 3a in the same manner.

The coil 1 is preferably placed on the above-mentioned position of the substrate 3 which has been subjected to such a treatment, and the coil 1 is preferably pressed against the substrate 3 in order to enhance the adhesive effect.

After the adhesive 4 is hardened and the coil 1 is adhered to the substrate 3, a load is applied to this portion of the winding end 1a and winding start 1b in order to prevent the terminal portions located at the air cores from floating. Pass through a reflow oven while adding
And the terminal portion and the circuit pattern 3a are soldered.

Therefore, the portion of the winding 1a and the winding start 1b that is soldered to the circuit pattern 3a and becomes a terminal should be preliminarily fixed when an adhesive layer or an insulating layer is formed at the winding stage of the coil 1. It needs to be removed, but it is not necessary when a thermosoftening resin is used as this layer.

Further, when the insulating layer on the end surface of the coil 1 is thin, it is desirable that the coil 1 is adhered to and connected to the substrate 3 and then subjected to a rust preventive treatment with a silicon agent or the like.

The width of the conductive ribbon is in millimeters, while the thickness is in microns. Therefore, even if the winding end 1a and winding start 1b are bonded to the end face of the coil 1, It is safe to assume that there will be no increase.

Next, an example of a method of manufacturing the air-core ribbon coil used in this embodiment will be described with reference to FIGS. 4 and 5.

In the first step, the epoxy resin is diluted on one surface of the wide copper foil a and applied as the insulating agent b using the roll coater 6.

At this time, the coating thickness is set by adjusting the doctor knife 7 attached to the roll coater 6, and after coating, it is heated and dried by the heater 8, solidified and wound on the winding roll 9. Then, the thickness of the insulating agent b after solidification may be such that the necessary electric insulation is obtained.

In the second step, the winding roll 9 is suspended so that the rotation direction of the winding roll 9 is reversed, and the copper foil a is hung on the roll coater 6 with the adhesive layer c facing upward. An adhesive prepared by diluting a polyamide-based thermoplastic resin is applied to the surface opposite to the adhesive surface c.

This is heated with a heater 8, dried and solidified, and wound on a winding roll 10 as an adhesive layer c. As shown in FIG. 5, one side of the copper foil a is an insulating layer b and the other side is an adhesive layer. Layer c
A wide three-layer ribbon d is formed.

In the third step, the three-layer ribbon d is wound around the trapezoidal core 11 with a required number of turns while applying back tension.

Next, as a fourth step, a three-layer ribbon d wound around the core 11
Is placed in a jig 12 having a required shape and is strongly compressed from above by a jig 13 having a required shape, and has a shape that swells toward the outer periphery in the winding step of the third step. This is a step of bringing the wound layers into close contact with each other in a desired shape in which the inner and outer peripheries are parallel.

In the fifth step, the molded three-layer ribbon d is attached to the jig 12, 1
3 is heated in a hot air drying oven 15 having a heater 14, and the adhesive layer c bonds the insulating layer b and the copper foil a, which are adhered in the fourth step, by this heating and cooling.

The sixth step is a three-layer ribbon d with a strong shape retention ability in the previous step.
Then, the core 11 is pulled out using a press-fitting machine.

The seventh step is a step of cutting the three-layer thin strip d from which the core 11 has been removed to a required thickness, and the wires 16 and 3 are cut through the floating abrasive grains.
The wire 16 is cut while applying stress to the layer ribbon d and moving the wire 16 back and forth.

In order to improve the cutting efficiency, the three-layer ribbon d may be fixed to a glass plate or the like with an adhesive and cut at the same time with a large number of wires.

The eighth, ninth and tenth steps are steps for cleaning the abrasive grains attached to the three-layer ribbon d after the cutting, and the cleaning is ultrasonic cleaning using trichlene and diflon which do not adversely affect the three-layer ribbon d. The drying is performed by the machine 17, and the drying is performed by using the hot air drying furnace while heating the heater 18 at a lower temperature than the fifth step.

The 11th step is nitric acid (HNO ₃ ), ferric chloride (FeCl 3
₃ ) In an etching process using, for example, the interlayer of the three-layer ribbon d is short-circuited by copper powder at the time of cutting and burrs of the material of the copper foil a, which is removed by etching. The reason why nitric acid is used is that it does not adversely affect the insulating agent layer b and the adhesive layer c including the subsequent steps.

The twelfth and thirteenth steps are the steps of removing the etching agent used in the previous step. The washing is performed by neutralizing the etching agent and then washing with water, or after performing direct washing with water, the heater 18 is dried.
In the hot air drying furnace 19 which is heated at the same temperature as the 10th step.

The following 14th and 15th steps are insulation treatment steps for the cut end surface.
The epoxy system or the polyamide system is immersed in a diluted tank 20 and dried in a hot air drying oven 19 heated by a heater 18.

Finally, in the 16th step, the winding start and the winding end of the 3-tank thin strip d are drawn to form terminals.

In the above-described embodiment, the winding end 1 serving as the terminal of the coil 1
A, the winding start 1b and the circuit pattern 3a are soldered by the cream solder 5, but the same effect can be obtained even if they are connected by thread solder or laser welding.

Further, the winding end 1a and the winding start 1b are sandwiched between the lower surface of the coil 1 and the substrate 3, but this is the upper surface of the coil 1 as shown in FIG. It is also possible to make a bend in the section and connect it to the circuit pattern 3a.

[Effect of device]

As described above, the present invention occupies the board including the connecting part because the winding end, which is the terminal of the air-core ribbon coil, and the winding start are connected to the circuit pattern of the board in the air-core part of the coil. The area is limited to the outer shape of the coil, the occupied area can be reduced as compared with the conventional case, and the size of the substrate can be reduced.

Since the end of winding and the beginning of winding can be adhered to the end surface of the coil to form the coil, the automatic supply to the substrate and the adhesion and soldering can be automated like other electric parts.

Further, by using cream solder and a reflow oven for soldering, the man-hours for soldering can be reduced, which leads to a drastic reduction in man-hours when the number of coils is large as in a motor.

[Brief description of drawings]

1 and 2 are a plan view and a sectional view of an embodiment of the present invention,
FIG. 3 is a perspective view of an air-core ribbon coil subjected to terminal treatment, and FIG. 4 is a process drawing showing an example of the manufacturing process of this coil,
FIG. 6 is a sectional view of a 3-tank ribbon, FIG. 6 is a sectional view of another embodiment,
FIG. 7 and FIG. 8, FIG. 9 and FIG. 10, FIG. 11 and FIG.
FIG. 2 is a plan view and a sectional view showing a conventional air core ribbon coil terminal connecting device. 1 ... coil, 1a ... end of winding, 1b ... start of winding, 2 ...
… Adhesive, 3 …… Substrate, 3a circuit pattern, 4 …… Adhesive, 5 …… Cream solder.

Claims (1)

[Scope of utility model registration request] 1. A ribbon-shaped conductive ribbon is formed by pulling out a conductive ribbon at the start and end of winding of an air-core ribbon coil wound with an insulating adhesive layer interposed between the winding layers. The terminal of the air core ribbon coil is passed through one surface of the air core portion of the air core ribbon coil to be bonded to the end surface of the air core ribbon coil, and the substrate and the end surface of the air core ribbon coil are bonded together, and the air core ribbon A terminal connecting device for an air-core ribbon coil, wherein a circuit of a substrate and one surface of a terminal are soldered in an air-core portion of the coil.