JPH09232126A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable engagement of a lead wire with a terminal pin without causing the lead wire to interfere with a terminal end portion of a coil winding. SOLUTION: This coil component has a coil winding 3, terminal pins 4 for entangling therewith terminal end portions 3a, 3b of the coil winding 3, and a terminal portion 7 for fixing the terminal pins 4. On a surface of the terminal portion 7 where the terminal pins 4 are fixed, a step portion or recess portion 8 recessed toward the fixed side of the terminal pins 4 is provided. The terminal pins 4 are fixed on the lower side plane of this step portion or recess portion 8, and the terminal end portions 3a, 3b are entangled with the bottom of the terminal pins 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a coil component for housing a coil winding of a motor or the like.

[0002]

2. Description of the Related Art Conventionally, a stepping motor 30 as shown in FIG. 10 has been known. In this stepping motor 30, two coil bobbins 31, 31 are incorporated back to back. In addition, in each coil bobbin 31,
As shown in FIG. 11, terminal portions 33 in which the respective end portions of the metal terminal pins 32, 32 are embedded are provided.
The terminal portion 33 is provided on the periphery of one of the pair of flange portions formed at both ends of the winding drum portion around which the coil winding is wound.

Then, a core wire 36, which is a conducting portion of a lead wire 35, which serves as an energizing member for energizing the coil winding while enclosing the terminal portion 34 of the coil winding in the terminal pin 32, is provided in this terminal pin 32. It is entwined like. After that, the core wire 36 is electrically connected and fixed to the terminal pin 32 with the solder 37. At this time, the tip portion of the resinous insulator 38 including the core wire 36 is also fixed with the solder 37 together with the core wire 36. In some cases, the core wire 36 is not entangled as shown in FIG. 13 but is fixed by solder 37 by so-called sticking.

In this prior art, the terminal pin 3
The detailed steps of winding and soldering the end portions 34 of the coil winding around the terminals 2 and 32 are as follows. That is, first, the terminal portion 34 is wound around the terminal pin 32. Next, the terminal pins 32 are placed in the bath containing the solder 37.
Then, the solder 37 is fried toward the base of the terminal pin 32 (so-called solder fried work). Then, the core wire 36 of the lead wire 35 is entangled with the terminal pin 32 having the solder 37 attached thereto.
Finally, solder 37 is attached to the entire terminal pin 32 to fix the terminal portion 34 and the core wire 36 to the terminal pin 32. Through these steps, the terminal portion 34 of the coil winding is fixed to the terminal pin 32. Then, electric power is supplied to the coil component through the lead wire 35.

[0005]

However, in the above-described conventional coil component, the coil winding terminal portion 34,
Since the core wire 36 of the lead wire 35 is the same as the core wire 36, when the core wire 36 of the lead wire 35 is entangled with the terminal pin 32 (the above process), the core wire 36 of the lead wire 35 is There is a problem that the terminal portion 34 of the coil winding interferes and the terminal portion 34 is disconnected. In addition, the solder 37 is often lifted up to the terminal portion 34 during the soldering operation, and the terminal portion 34 is fixed to the terminal pin 32 by the solder 37. As a result, when the core wire 36 of the lead wire 35 is entangled, stress is applied by the entanglement work of the core wire 36 to the separation portion between the fixed portion and the non-fixed portion of the terminal portion 34, and the terminal portion 34 is cut. The phenomenon that it is done may occur.

It is an object of the present invention to provide a coil component in which, when a lead wire or the like is locked to a terminal pin, the lead wire or the like can be locked without interfering with the terminal portion of the coil winding. And

[0007]

In order to achieve the above object, the invention according to claim 1 has a coil winding, a terminal pin for tying a terminal portion of the coil winding, and a terminal for fixing the terminal pin. And a surface for fixing the terminal pin of the terminal portion,
A step portion is provided which is recessed toward the fixed side of the terminal pin, the terminal pin is fixed to the lower side surface of the step portion, and the terminal portion is entangled with the root of the terminal pin.

[0008] Further, the invention according to claim 2 is based on claim 1.
In the coil component described above, two recesses are symmetrically provided in the terminal portion to form a recess, and the terminal pin is fixed to the recess,
A conducting portion of a lead wire for connecting an external device is entwined with a portion of the terminal pin protruding from the recess.

According to the third aspect of the present invention, the coil winding is wound around the winding body of the coil bobbin, and the terminal is provided on the periphery of one of the pair of flanges formed at both ends of the winding body. A terminal portion with embedded pins is formed, and a recessed portion that is recessed toward the center of the coil bobbin is provided on the surface of the terminal portion where the terminal pin is embedded, the terminal pin is fixed in this recessed portion, and the coil winding The terminal part of is tied to the terminal pin.

Further, according to the present invention, a cup-shaped case body, a winding cylinder part housed in the case body and formed in a substantially cylindrical shape, and a pair of flanges fixed to both ends of the winding cylinder part. Two coil bobbins each having a portion, a pair of terminal portions respectively provided on the peripheral edges of the adjacent flange portions of the coil bobbin, a terminal mounting portion arranged on the pair of terminal portions, and one end of the terminal mounting portion. In a coil component having a terminal pin that is embedded and has the other end extending to the outside of the case body, and a coil winding wound around the winding body of the coil bobbin, the terminal mounting portion is recessed in the inner circumferential direction of the coil bobbin. The terminal portion of the coil winding is wound around the terminal pin and fixed by soldering in the concave portion.

According to a fifth aspect of the invention, in the coil component according to the fourth aspect, the terminal portion and the terminal mounting portion are
It is provided integrally with the outer peripheral edge of the flange portion. Further, in the invention according to claim 6, in the coil component according to claim 5, the outer peripheral edge of each of the flange portions fixed to both ends of the winding drum portion of the two coil bobbins protrudes toward the outer peripheral side of the winding drum portion. Each of the formed pair of flange portions is provided.

In the coil component of the present invention, the terminal portion is provided with a step portion or a concave portion serving as a terminal mounting portion. One end of the terminal pin is embedded in the lower side surface or the concave portion of the step portion, and all or most of the end portion of the coil winding is entangled with the terminal pin in the step portion or the concave portion. After that, this terminal portion is soldered and fixed to the terminal pin. According to this configuration, the conductive portion of the lead wire is entangled with the step portion or the portion protruding from the concave portion of the terminal pin, so that the lead wire does not interfere with the coil winding entwined with the terminal pin. The coil winding can be prevented from being cut because it can be tied up.

If a terminal portion is provided on one flange portion of a coil bobbin having a winding drum portion and a pair of flange portions, and a terminal pin is provided in the recess of the terminal portion, the coil winding wound around the winding drum portion. It becomes easy to tie the end part of the to the root of the terminal pin.

By providing two such coil bobbins and arranging them in a cup-shaped case, a coil component such as a stepping motor can be constructed. Moreover, if the terminal portion is integrally provided on the outer peripheral edge of the flange portion,
Since the terminal portion of the coil winding wound around the winding drum portion can be easily entangled with the terminal pin, the assembling work becomes easier.

Further, when the outer peripheral edge of the flange portion is projected to the outer peripheral side of the winding drum portion, the coil winding is housed in the flange portion, and when the coil bobbin is housed in the case body, the coil winding is housed in the case body. The contact with the peripheral wall is prevented, the assembly is further facilitated, and the coil winding does not come into contact with the case body and break.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a coil component of the present invention will be described in detail below with reference to FIGS. 1 to 8. This coil component is a coil component incorporated in a stepping motor and accommodates a conductive coil winding. The coil component of this embodiment is housed in a cup-shaped case body 1, and includes a coil bobbin 2 and a coil winding 3 wound around the coil bobbin 2.
And a terminal pin 4 around which the coil winding 3 is entangled.

The cup-shaped case body 1 is made of metal and has a notch 1a formed by cutting out from the open end side toward the bottom side. And in this case body 1,
Two coil bobbins 2 and 2 are accommodated side by side.

Each of the coil bobbins 2 and 2 has a winding barrel portion 5 formed in a substantially cylindrical shape, and a donut-shaped flange portion integrally formed at both ends of the winding barrel portion 5 so as to sandwich the winding barrel portion 5. It consists of 6 and 6. A terminal portion 7 protruding in the radial direction is integrally formed on an outer peripheral edge portion of one of the flange portions 6 and 6. Then, as shown in FIG. 4, the two coil bobbins 2 are incorporated in the case body 1 so that the terminal portions 7 come into contact with each other. In addition,
As shown in FIG. 1, the terminal portion 7 further extends in the radial direction and the circumferential direction from the outer peripheral edge of the flange portion 6, and the engagement portion 7 with which the peripheral portion of the notch 1 a of the case body 1 fits.
has a, 7a

Further, a concave portion 8 serving as a terminal mounting portion is arranged in the center of the terminal portion 7 so as to be sandwiched between the engaging portions 7a, 7a, and the flange portion 6 is provided on the outer peripheral edge of the flange portion 6.
And are formed integrally. Here, the concave portion 8 to be the terminal mounting portion
The outer surface of the coil bobbin 2 is located closer to the center of the coil bobbin 2 than the outer surfaces of the engaging portions 7a, 7a. That is,
The concave portion 8 serving as the terminal mounting portion has a recessed shape with respect to the outer surface of the terminal portion 7 (see FIGS. 1 and 3).

The two coil bobbins 2, 2 thus constructed are arranged side by side and housed in the case body 1. At this time, the terminal parts 7, 7 are projected from the notch 1a to the outside of the case body 1. Is located in. That is, the terminal portions 7, 7
The engaging portions 7a, 7a are engaged with the groove 7f so that the edges of the notch 1a fit. As a result, the case body 1 positions and holds the pair of coil bobbins 2 and 2 housed in the case body 1 in the circumferential direction. It should be noted that one end of each of the two terminal pins 4 and 4 is embedded in the terminal portion 7 so as to project to the outside of the case body 1 in the recessed portion 8 serving as the terminal mounting portion. Furthermore, the coil guide pin 7b is located between the terminal pins 4 and 4,
It is provided in the recess 8.

Around the outer circumference of the winding drum portion 5, a thin filament coil winding 3 is wound in multiple layers. The terminal portion 3a at the beginning of the coil winding 3 is guided by the first guide groove portion 7c provided in the terminal portion 7 and is entwined with the one terminal pin 4.
Further, the end portion 3b of the winding end of the coil winding 3 is guided to the second guide portion 7d provided at the center of the terminal portion 7 and the deep guide groove 7e following the second guide portion 7d, and the guide pin 7b. It is hooked on and is entangled in the other terminal pin 4. The guide pin 7b is used for the terminal portion 3 at the end of winding.
In order to prevent b from being caught in the case body 1, the terminal portion 3b is entwined with the terminal pin 4 from the central portion of the terminal portion 7.

Here, the coil winding 3 is initially wound around the terminal pin 4 in a slack state within the gap in the recess 8 which serves as the terminal mounting portion. After this, the terminal pins 4 of the coil bobbin 2
With the terminal 4 facing downward, the tips of the terminal pins 4 and 4 are attached to a solder bath (not shown). At this time, the solder is not lifted up to the root portions of the terminal pins 4 and 4, and the terminal portions 3a and 3b are both kept in a loose state. After that, as shown in FIG. 3, the lead wire 10 and its core wire 11 are drawn from the tangential direction of the coil bobbin 2 and engaged with the terminal pins 4 and 4 which have been soldered. At this time, the lead wire 10 and the core wire 11 are
As shown in FIG. 3, the terminal portions 3a and 3b of the coil winding 3 are entangled without interfering with each other. After that, the entwined core wire 11 and the terminal portions 3a and 3b of the coil winding 3 are soldered, and the lead wire 10 and its core wire 11 and the terminal portion 3 are soldered.
a and 3b are fixed.

Thus, the terminal portions 3a, 3 of the coil winding 3 are
b is wound around the terminal pins 4 and 4 in the concave portion 8 serving as the terminal mounting portion, and the lead wire 10 and its core wire 11 are also wound.
Is drawn from the tangential direction of the coil bobbin 2 and engaged with the terminal pins 4 and 4, so that the lead wire 10 does not enter the recess 8 and the terminal portion 3 of the coil winding 3 in the recess 8 is inserted.
It does not interfere with a and 3b. Although the coil bobbin 2 is housed in the case body 1 after the lead wire 10 is fixed to the terminal pin 4, the coil bobbin 2 is housed in the case body 1 and then fixed to the lead wire 10 and the terminal pin 4. May be.

A rotor (not shown) is arranged in the center hole of the winding barrel portion 5 of the coil bobbin 2 and an output shaft 9 which rotates integrally with the rotor projects outward from the case body 1 of the stepping motor. There is. Furthermore, lead wire 1
0 is passed between the four terminal pins 4 as shown in FIG. 8 so as to resist the pulling force from the outside and prevent the four lead wires 10 from being entangled with each other. Then, external power is supplied via the lead wires 10, 10.
As a result of the rotation of the rotor, the output shaft 9 rotates.

As described above, the coil component is entwined with the terminal pin 4 in the recess 8 where the terminal portions 3a and 3b of the coil winding 3 serve as terminal mounting portions, while the lead wire 10 and the core wire 11 are entangled.
Is entangled in the portion of the terminal pin 4 that protrudes from the recessed portion 8, so that it does not interfere with the coil winding 3 when the lead wire 10 and the core wire 11 are entangled, and the terminal portions 3a and 3b thereof are not cut. . Moreover, the engaging portion 7 for forming the concave portion 8
It becomes possible for the a and 7a to guide the terminal portions 3a and 3b along the adjacent step portions, so that the terminal portions 3a and 3b can be smoothly wound around the terminal pins 4, that is, entangled.

Further, in this embodiment, the notch 1a of the case body 1 is made large, the terminal portion 7 is made wide, and the height in the radial direction is made high, so that the terminal pin 4 can be firmly fixed. It has become. On the other hand, as a result of heightening the installation of the terminal pin 4, there is a high possibility that the end portion 3b at the end of winding will come into contact with the case body 1. It is designed to be fixed via 7b.

The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. is there. For example, in the above-described embodiment,
Although the lead wire 10 is fixedly engaged with the terminal pins 4 and 4, the circuit board 12 for driving the motor may be directly fixed to the terminal pin 4 as shown in FIG. 9 instead of the lead wire 10. At this time, as shown in FIG. 9, it is preferable to mount the circuit board 12 on the engaging portions 7a, 7a. As the circuit board 12, various kinds of electrical connection relay products such as a flexible circuit board and a printed circuit board can be used. In addition, the terminal portions 3 a and 3 b in the recess 8 have the lead wire 10 even if the tip portion thereof is protruded from the recess 8.
Further, the interference with the core wire 11 is considerably reduced as compared with the conventional one. Further, when the circuit board 12 is attached, solder is applied to the place where the circuit board 12 is attached, so that the circuit board 12 has a sufficient effect against disconnection. Furthermore, the recessed portion 8 is not provided in the terminal portion 7, that is, one engagement portion 7a is not provided, and a step is provided only on one terminal pin 4 side, or the central portion sandwiched by both terminal pins 4 and 4 is raised. However, a step may be provided to lower the portion where the terminal pins 4 and 4 are provided.

[0028]

As described above, in the coil component of the present invention, the terminal pin for winding the terminal portion of the coil winding is provided on the lower side surface or the concave portion of the step portion of the terminal portion, and the terminal pin is provided at the end of the terminal portion. Since the parts are entwined with the terminal pins, when fixing other parts such as lead wires to the terminal pins, other parts such as lead wires do not interfere with the end parts of the coil winding, and the end parts of the coil winding The part is not cut off. In addition, since the risk of interference is reduced, the work of attaching another component such as a lead wire is facilitated and the productivity is improved. Therefore, a product using this coil component, for example, a stepping motor can be made reliable and at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of a coil component of the present invention.

FIG. 2 is a view as seen from the direction of arrow II in FIG.

FIG. 3 is a partial enlarged view of the vicinity of the terminal pin in the embodiment shown in FIG.

FIG. 4 shows a coil component (lead wire omitted) shown in FIG.
It is an exploded front view showing the state of accommodating in a combination case body.

5 is a cross-sectional view near the center of the coil bobbin when the coil bobbin shown in FIG. 1 is housed in a case body.

6 is a partially cutaway plan view showing a state before coil winding is applied to the coil component shown in FIG. 1. FIG.

7 is a view as seen from the direction of arrow VII in FIG.

FIG. 8 is a plan view of a stepping motor incorporating the coil component of the present invention.

FIG. 9 is a partially enlarged view for explaining a modified example in which a circuit board is fixed to a terminal pin instead of a lead wire.

FIG. 10 is a plan view of a stepping motor incorporating a conventional coil component.

11 is an external view of a conventional coil component incorporated in FIG.

FIG. 12 is an enlarged view of the vicinity of the terminal pin shown by arrow D in FIG. 11, and is a view for explaining a conventional connecting method of lead wires.

13 is an enlarged view of the vicinity of the terminal pin shown by the arrow D in FIG. 11, and is a view for explaining another conventional connecting method of the lead wire.

[Explanation of symbols]

 1 case body 2 coil bobbin 3 coil winding 3a, 3b terminal part 4 terminal pin 6 flange part 7 terminal part 8 recess 10 lead wire 11 core wire

Claims (6)

[Claims] 1. A coil winding, a terminal pin for entwining a terminal portion of the coil winding, and a terminal portion for fixing the terminal pin, and a surface of the terminal portion for fixing the terminal pin, A coil component, characterized in that a step portion that is recessed toward the fixed side of the terminal pin is provided, the terminal pin is fixed to the lower side surface of the step portion, and the terminal portion is entangled at the root of the terminal pin. 2. The stepped portion is symmetrically provided on the terminal portion to form a recessed portion, and the terminal pin is fixed to the recessed portion,
2. The coil component according to claim 1, wherein a conducting portion of a lead wire for connecting an external device is entwined with a portion of the terminal pin protruding from the recess. 3. A coil winding is wound around a winding body of a coil bobbin, and a terminal portion in which a terminal pin is embedded is formed at a peripheral edge of one of the pair of flange portions formed at both ends of the winding body. Then, a recessed portion that is recessed toward the center of the coil bobbin is provided on the surface of the terminal portion in which the terminal pin is embedded, and the terminal pin is fixed in this recessed portion, and the end portion of the coil winding is fixed in the recessed portion. A coil component characterized by being entangled with the terminal pin. 4. A cup-shaped case body, and two coil bobbins that are housed in the case body and that have a substantially cylindrical winding body portion and a pair of flange portions that are fixed to both ends of the winding body portion. , A pair of terminal portions respectively provided on the peripheral edges of the adjacent flange portions of the coil bobbin, a terminal mounting portion arranged on the pair of terminal portions, and one end of which is embedded in the terminal mounting portion and the other end of which is In a coil component having a terminal pin extending to the outside of the case body and a coil winding wound around the winding body of the coil bobbin, the terminal mounting portion is formed from a concave portion recessed in the inner circumferential direction of the coil bobbin. In the coil component, the terminal portion of the coil winding is wound around the terminal pin and fixed by soldering in the recess. 5. The coil component according to claim 4, wherein the terminal portion and the terminal mounting portion are integrally provided on an outer peripheral edge of the flange portion. 6. The two coil bobbins include a pair of flange portions formed such that outer peripheral edges of the flange portions fixed to both ends of the winding drum portion project outward from the winding drum portion. The coil component according to claim 5, wherein the coil component is provided.