JP5880588B2 - Inductance element - Google Patents

Description

  The present invention relates to an inductance element, and more particularly to an inductance element that can be mounted on any of land electrodes having different widths.

  2. Description of the Related Art As an inductance element used in various electronic devices, an element having a structure in which a conducting wire is wound around a drum-type core and both ends of the conducting wire are connected to terminal electrodes formed on the core is widely used.

  For example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2010-171054) discloses a conventional inductance element having such a structure. FIG. 9 shows an inductance element 800 disclosed in Patent Document 1.

  The inductance element 800 includes a drum-type core 101. The core 101 has a structure in which an upper collar part 102 and a lower collar part 103 are formed at both ends of a winding core part (not shown). In FIG. 9, for convenience of explanation, the inductance element 800 is shown upside down, that is, the upper collar portion 102 is shown downward and the lower collar portion 103 is shown upward.

  The lower collar portion 103 includes an inner surface (not shown) on the winding core side, a bottom surface 103a, a pair of side surfaces 103b, and a pair of end surfaces 103c. The side surface 103b has a shape in which a plurality of surfaces are connected.

  A conductive wire 104 with an insulating coating is wound around the core of the core 101.

  Further, a pair of terminal electrodes 105, 105 are formed on the bottom surface 103 a of the lower collar portion 103 of the core 101. Then, both end portions 104a and 104a of the conducting wire 104 are connected to the terminal electrodes 105 and 105 after the insulating coating is peeled off in advance through the side surface 103b and the bottom surface 103a of the lower collar portion 103, respectively. .

  In the inductance element 800, a pair of grooves 103d and 103d are formed on the bottom surface 103a of the lower flange 103, and both ends 104a and 104a of the conducting wire 104 are accommodated in the grooves 103d and 103d. The terminal electrodes 105 and 105 are each formed by providing a recess (not shown) on the bottom surface 103a of the lower collar 103 and embedding solder therein. However, the grooves 103b and 103b are not always necessary. The terminal electrodes 105 and 105 are not formed by embedding solder in the recesses, but are generally formed by baking a silver paste on the bottom surface 103 a of the lower collar portion 103.

JP 2010-171054 A

  However, the above-described conventional inductance element 800 can be appropriately mounted on a land electrode having a specific width when mounted by reflow soldering using cream solder or the like, but is appropriate for a land electrode having other width. There was a problem that could not be implemented.

  That is, not only the inductor element but also the recommended size of the land electrode is often indicated by the manufacturer or seller (hereinafter referred to as “manufacturer etc.”) of the electronic component. For example, in Company A, which is a manufacturer, etc., as shown in FIG. 10 (A), a pair of land electrodes (hereinafter referred to as “narrow land electrode 201”) having a width of 1.0 mm × a length of 0.9 mm are used. We recommend the land electrodes facing each other at intervals of 0.8 mm, and manufacture and sell inductance elements with terminal electrodes that match them. On the other hand, as shown in FIG. 10B, Company B, which is another manufacturer, etc., uses a pair of land electrodes (hereinafter referred to as “wide land electrode 202”) having a width of 1.6 mm × length of 0.65 mm. We recommend the land electrodes facing each other at intervals of 0.7 mm, and manufacture and sell inductance elements with terminal electrodes that match them.

  Note that the inductance element is mounted by applying cream solder or the like to the surface of the narrow land electrodes 201, 201 or the wide land electrodes 202, 202 formed on the substrate or the like, and then placing the inductance element on each substrate. It is carried out by putting it in a tunnel furnace and heating it, and then removing it from the tunnel furnace and cooling it.

Since the inductance element 800 is formed so that the terminal electrode 105 has a width of about 1.0 mm, the inductance element 800 can be appropriately mounted on the narrow land electrodes 201 and 201 as shown in FIG. (In FIG. 11A, the portion hidden in the inductance element 800 of the narrow land electrode 201 is indicated by a broken line, and the terminal electrode 105 that is not visible because it is formed on the bottom surface of the inductance element 800 is indicated by a dashed line with hatching. (Hereinafter, the same way of showing is shown in FIGS. 11B, 13A, and 13B.)
However, when the inductance element 800 is to be mounted on the wide land electrodes 202 and 202, the inductance element 800 may rotate on the wide land electrodes 202 and 202 as shown in FIG. This is because when the cream solder is melted by heating, the position of the inductance element 800 flows without being stabilized.

  In order to properly mount the inductance element on the wide land electrodes 202, 202, the terminal electrode had to be formed wide. FIG. 12 shows another conventional inductance element 900 in which the design of the width of the terminal electrode 105 of the inductance element 800 is widened.

  In the inductance element 900, the terminal electrode 115 has a width of about 1.6 mm. Other configurations of the inductance element 900 are the same as those of the inductance element 800 described above.

  As a result, the inductance element 900 can be appropriately mounted on the wide and narrow land electrodes 201 and 201 as shown in FIG.

  However, if the inductance element 900 is to be mounted on the narrow land electrodes 201, 201, the inductance element 900 may shift to one side of the narrow land electrodes 201, 201 as shown in FIG. It was. This is because when the cream solder is melted by heating, the position of the inductance element 900 flows without being stabilized.

  As described above, in the conventional inductance elements 800 and 900, when mounted by reflow soldering using cream solder or the like, it can be appropriately mounted on a land electrode having a specific width. There was a problem that could not be implemented properly. That is, when the sizes of the land electrodes recommended by Company A and Company B are different, only the inductance element of Company A can be mounted on the land electrode recommended by Company A, and the inductance of Company B is applied to the land electrode recommended by Company B. There was a problem that only elements could be mounted and they were not compatible with each other.

  In the conventional inductance element 900 in which the width of the terminal electrode 115 is increased, there is another problem that it is difficult to find the disconnection of the conductive wire 104. That is, the end portion 104 a of the conductive wire 104 is connected to the terminal electrode 115 formed on the bottom surface 103 a of the lower collar portion 103 via the side surface 103 b of the lower collar portion 103, but the conductive wire 104 is connected to the lower collar portion 103. It is easy to break near the side formed by the side surface 103b and the bottom surface 103a. However, if the terminal electrode 115 having a large width exists in the vicinity of the side formed by the side surface 103b and the bottom surface 103a on the bottom surface 103a of the lower collar portion 103, the disconnection of the conductive wire 104 in this portion is overlooked in visual inspection. There was a problem that it was easy to end up. That is, since the conductive wire 104 from which the insulation coating has been peeled off and the terminal electrode 115 are both metallic in color, the conductive wire 104 may be mistaken as disconnected even though the conductive wire 104 is disconnected. It was.

The present invention has been made to solve the above-described problems of the conventional inductance element, and as the means, the inductance element of the present invention is formed at the core portion and at both ends of the core portion. A core provided with an upper collar part and a lower collar part, a conducting wire wound around the core part, and a pair of terminal electrodes formed on the lower collar part, the lower collar part comprising an inner surface, a bottom surface, A pair of side surfaces and a pair of end surfaces are provided, and the pair of terminal electrodes are respectively formed in a main electrode region formed on the bottom surface of the lower collar, and from the main electrode region to the pair of side surfaces of the lower collar At least one pair of extended electrode regions each extending, and both ends of the conducting wire are connected to the terminal electrode via the side surface and bottom surface of the lower collar, respectively, and both ends of the conducting wire on the bottom surface of the lower collar are routed In the area where the conductor is located near the side formed by the side and bottom surfaces of the lower collar The disconnection so can easily found when disconnected, extension electrodes Ryoiki the terminal electrodes are prevented from being formed. Further, along the extending direction of the pair of extension electrode regions, the outer end portion of one extension electrode region of the pair of extension electrode regions extends outside the other extension electrode region of the pair of extension electrode regions. The first distance to the end and the second distance from one end of the main electrode region along the direction parallel to the extending direction to the other end are different from each other, and the first distance and the second distance are A pair of terminal electrodes along a direction parallel to the extending direction is determined based on the distance from one end to the other end of each of the plurality of land electrodes to be mounted.

  In addition, you may form the recessed part for passing a conducting wire in the side surface of a lower collar part. In this case, even when an object (device, jig, other electronic component, etc.) unexpectedly collides with the side surface of the lower collar part during manufacturing or mounting, the conductor does not break.

  Further, each of the pair of terminal electrodes may further include an end face electrode region on the end face of the lower collar. In this case, since a solder fillet can be formed between the end face electrode region and the land electrode, a strong joint can be realized.

  Further, the extended electrode region of the terminal electrode may be provided with a plurality of different lengths in the direction from the main electrode region to the side surface of the lower collar portion, with a step portion formed in the middle. For example, when the extension electrode region has two different lengths, the main electrode region and the extension electrode region can be mounted on any of the land electrodes having a total of three different widths.

  Further, the extended electrode region of the terminal electrode may be formed to reach the side formed by the bottom surface and the side surface of the lower collar portion, respectively.

  The inductance element of the present invention includes a main electrode region and at least one pair of extended electrode regions extending from the main electrode region in a pair of side surface directions of the lower collar portion. It can be mounted on any of the electrodes.

  In addition, since the inductance element of the present invention does not provide the extended electrode region of the terminal electrode in the region through which both ends of the conductive wire on the bottom surface of the lower collar portion pass, when the conductive wire is disconnected in the vicinity thereof, Can be easily discovered.

FIG. 1A is a perspective view showing an inductance element 100 according to the first embodiment of the present invention. FIG. 1B is a bottom view showing the inductance element 100. FIG. 2A is a plan view showing a state in which the inductance element 100 is mounted on the narrow land electrode 201. FIG. 2B is a plan view showing a state where the inductance element 100 is mounted on the wide land electrode 202. It is a bottom view which shows the inductance element 200 concerning 2nd Embodiment of this invention. It is a bottom view which shows the inductance element 300 concerning 3rd Embodiment of this invention. It is a bottom view which shows the inductance element 400 concerning 4th Embodiment of this invention. It is a bottom view which shows the inductance element 500 concerning 5th Embodiment of this invention. It is a bottom view which shows the inductance element 600 concerning 6th Embodiment of this invention. It is a bottom view which shows the inductance element 700 concerning 7th Embodiment of this invention. It is a perspective view which shows the conventional inductance element 800. FIG. 10A is a plan view showing the narrow land electrode 201. FIG. 10B is a plan view showing the wide land electrode 202. FIG. 11A is a plan view showing a state in which the inductance element 800 is mounted on the narrow land electrode 201. FIG. 11B is a plan view showing a state where the inductance element 700 is mounted on the wide land electrode 202. It is a perspective view which shows another conventional inductance element 900. FIG. FIG. 13A is a plan view showing a state where the inductance element 900 is mounted on the wide land electrode 202. FIG. 13B is a plan view showing a state in which the inductance element 900 is mounted on the narrow land electrode 201.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
1A and 1B show an inductance element 100 according to a first embodiment of the present invention. 1A is a perspective view, and FIG. 1B is a bottom view.

The inductance element 100 includes a drum-type core 1 made of ferrite or the like. The core 1 has a structure in which an upper collar part 2 and a lower collar part 3 are formed at both ends of a core part (not shown). In FIG. 1A, for convenience of explanation, the inductance element 100 is shown upside down, that is, the upper collar part 2 is shown below and the lower collar part 3 is shown above. The core 1 may be formed of a magnetic material such as ferrite, or may be formed of a nonmagnetic material such as alumina.

  The lower collar portion 3 includes an inner surface (not shown) on the winding core portion side, a bottom surface 3a on the back side of the inner surface, a pair of side surfaces 3b, and a pair of end surfaces 3c. Note that the side surface 3b is formed in a shape in which a plurality of surfaces are connected to each other, and a concave portion 3e for passing a conducting wire 4 described later is formed by these surfaces.

  A conductive wire 4 made of Cu, Ag or the like, which is coated with an insulating coating such as polyurethane, is wound around the core portion of the core 1.

  Further, a pair of terminal electrodes 5 and 5 are formed on the bottom surface 3 a of the lower collar portion 3 of the core 1. The terminal electrodes 5 and 5 are formed by baking a silver paste, a copper paste, etc., for example.

  Each terminal electrode 5 has, on the bottom surface 3a of the lower collar part 3, a main electrode area 5a and at least one pair of extended electrode areas 5b extending from the main electrode area 5a in the direction of the pair of side faces 3b of the lower collar part 3, 5b. Further, each terminal electrode 5 includes an end face electrode region 5 c on the end face 3 c of the lower collar portion 3. In FIG. 1B, a broken line is shown between the main electrode region 5a and the extended electrode region 5b. However, this is shown for the sake of explanation, and actually both are integrally formed. Has been.

  The main electrode region 5a serves to enable mounting on the narrow land electrode 201 shown in FIG. 9A, and has a width of about 1.0 mm. On the other hand, the extension electrode regions 5b and 5b serve to enable mounting on the wide land electrode 202 shown in FIG. 9B. From the end of one extension electrode region 5b, the other extension electrode is provided. The width of the region 5b is about 1.6 mm. The end face electrode region 3c is used to form a solder fillet between the end electrode region 3c and the land electrode, thereby strengthening the bonding and appropriately adjusting the mounting position.

  And the both ends 4a and 4a of the conducting wire 4 are connected to the terminal electrodes 5 and 5 after the insulation coating has been peeled off in advance via the side surface 3b and the bottom surface 3a of the lower collar 3, respectively. .

  In the present invention, the extended electrode region 5b of the terminal electrode 5 is not formed in the vicinity of the connection portion between the end 4a of the conducting wire 4 and the terminal electrode 5 on the bottom surface 3a of the lower collar part 3, Since the substrate of the bottom surface 3a is exposed as it is, even if the conducting wire 4 is disconnected in the vicinity of the side formed by the side surface 3b and the bottom surface 3a of the lower collar portion 3, the disconnection can be easily detected. Therefore, a defective product is not mistakenly shipped as a non-defective product.

  In the present embodiment, the side surface 3b of the lower collar portion 3 is formed in a shape in which a plurality of surfaces are connected, and the concave portion 3e is formed on the side surface 3b by these surfaces. Therefore, the passage position on the side surface 3b of the lower collar portion 3 of the conducting wire 4 is stabilized by passing through the recess 3e.

  The inductance element 100 according to the first embodiment of the present invention having such a structure is manufactured by, for example, the following method.

  First, the drum-type core 1 provided with the upper collar part 2 and the lower collar part 3 at both ends of the core part is manufactured. Specifically, powders such as ferrite and alumina are filled in a mold having a predetermined shape and pressed to obtain a molded body. Subsequently, the molded body is fired with a predetermined profile to obtain the core 1.

  Next, a pair of terminal electrodes 5 and 5 are formed on the core 1. Specifically, a silver paste or a copper paste is printed in a desired shape on the bottom surface 3a and the end surface 3c of the lower flange portion 3 of the core 1, and is formed by baking.

  Next, the conducting wire 4 is wound around the core part of the core 1. Specifically, after one end 4a of the conducting wire 4 is fixed to a clamp mechanism or the like, it is wound using a wire supply nozzle or the like.

  Next, the both ends 4a and 4a of the conducting wire 4 are immersed in an insulating film remover to peel the insulating film from the surface.

  Finally, both end portions 4a and 4a of the conducting wire 4 are pressed by a pressure jig or the like and connected to the terminal electrodes 5 and 5 to complete the inductance element 100. In addition, when connecting the both ends 4a and 4a of the conducting wire 4 to the terminal electrodes 5 and 5, you may make it not only pressurize but heat or give an ultrasonic vibration.

  Next, the mounting state of the inductance element 100 according to the first embodiment will be described.

In the inductance element 100, since the width of the main electrode region 5a of the terminal electrode 5 is formed to be about 1.0 mm, the narrow land electrodes 201 and 201 having a width of 1.0 mm are formed as shown in FIG. Can be implemented appropriately. (In FIG. 2 (A), the portion hidden in the inductance element 100 of the narrow land electrode 201 is indicated by a broken line, and the terminal electrode 5 that is invisible because it is formed on the bottom surface of the inductance element 100 is indicated by a dashed line with hatching. Hereinafter, the same way of showing is shown in FIG.
In addition, the inductance element 100 is formed such that the width of the terminal electrode 5 from the end of one extension electrode region 5b to the end of the other extension electrode region 5b is about 1.6 mm. As shown, it can be appropriately mounted on the wide land electrodes 202 and 202 having a width of 1.6 mm.

  As described above, the inductance element 100 according to the first embodiment of the present invention can be satisfactorily mounted on any of the narrow land electrodes 201 and 201 and the wide land electrodes 202 and 202 having different widths.

  The structure of the inductance element 100 according to the first embodiment of the present invention, the example of the manufacturing method, and the mounting state have been described above. However, the present invention is not limited to the above contents, and various modifications can be made in accordance with the spirit of the invention.

  For example, in the inductance element 100, the width of the main electrode region 5a is about 1.0 mm, and the width from the end of one extension electrode region 5b to the end of the other extension electrode region 5b is about 1.6 mm. The width dimension is not limited to these, and can be appropriately changed according to the land electrode to be mounted.

[Second Embodiment]
FIG. 3 shows an inductance element 200 according to the second embodiment of the present invention.

  In the inductance element 200, a pair of grooves 13 d and 13 d for accommodating both end portions 4 a and 4 a of the conductive wire 4 are provided on the bottom surface 13 a of the lower collar portion 13. The other configuration of the inductance element 200 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  In the inductance element 200, the bottom surface 13a of the lower collar part 13 is provided with grooves 13d and 13d for receiving both ends 4a and 4a of the conductive wire. 13 does not protrude from the bottom surface 13a. Therefore, the inductance element 200 has a lower height than the inductance element 100.

[Third Embodiment]
FIG. 4 shows an inductance element 300 according to the third embodiment of the present invention.

  In the inductance element 300, the extended electrode region 15b of each terminal electrode 15 is formed so as to extend from the main electrode region 15a to the side formed by the bottom surface 3a and the side surface 3b of the lower collar part 3. The other configuration of the inductance element 300 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  In the inductance element 300, the width of the lower flange 3 can be matched with the width from the end of one extended electrode region 5b to the end of the other extended electrode region 5b, which is determined according to the land electrode to be mounted. That is, in the inductance element 300, the width of the lower collar portion 3 can be reduced to the minimum necessary, and the size can be reduced.

[Fourth Embodiment]
FIG. 5 shows an inductance element 400 according to the fourth embodiment of the present invention.

  In the inductance element 400, a pair of extended electrode regions 25 b and 25 b are formed along the end surface 3 c of the lower collar part 3 from the main electrode area 25 a of each terminal electrode 25 toward the side surface 3 b of the lower collar part 3. . The other configuration of the inductance element 300 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  Thus, the formation position of the extended electrode region 25b in each terminal electrode 25 is arbitrary. The inductance element 400 can also be favorably mounted on any of the two land electrodes having different widths.

[Fifth Embodiment]
FIG. 6 shows an inductance element 500 according to the fifth embodiment of the present invention.

  In the inductance element 500, two pairs of extended electrode regions 35b and 35b are formed from the main electrode region 35a of each terminal electrode 35 toward the side surface 3b of the lower collar portion 3, respectively. That is, the extended electrode regions 35b and 35b were formed on both sides of the connection portion between the end 4a of the conducting wire 4 and the terminal electrode 35, respectively. The other configuration of the inductance element 500 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  As described above, the number of extension electrode regions 35b and 35b provided in each terminal electrode 35 is arbitrary, and the inductance element 500 can be mounted well on either of two land electrodes having different widths.

[Sixth Embodiment]
FIG. 7 shows an inductance element 600 according to the sixth embodiment of the present invention.

  In the inductance element 600, a pair of extended electrode regions 45b having two different lengths are formed in the middle from the main electrode region 45a of each terminal electrode 45 toward the side surface 3b of the lower collar portion 3. Formed. That is, the extended electrode region 45b has two different lengths L1 and L2 from the main electrode region 45a toward the side surface 3b of the lower collar part 3, as shown in FIG. The other configuration of the inductance element 600 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  In this way, if the step portion is formed in the extended electrode region 45b and has two different lengths, the main electrode region and the extended region can be mounted on any of the land electrodes having three different widths in total. It becomes possible.

[Seventh Embodiment]
FIG. 8 shows an inductance element 700 according to the seventh embodiment of the present invention.

  In the inductance element 700, the corners of the terminal electrodes 55 are rounded. That is, each main electrode region 55a and each extended electrode region 55b have rounded corners. The other configuration of the inductance element 700 is the same as that of the inductance element 100 according to the first embodiment shown in FIGS.

  Thus, the corners of the terminal electrodes do not have to be right angles, and may be rounded like the terminal electrodes 55 of this embodiment.

1: Core 2: Upper collar part 3, 13: Lower collar part 3a, 13a: Bottom face 3b, 13b: Side face 3c, 13c: End face 13d: Groove 4: Conductor 4a: End parts 5, 15, 25, 35, 45, 55: Terminal electrodes 5a, 15a, 25a, 35a, 45a, 55a: Main electrode regions 5b, 15b, 25b, 35b, 45b, 55b: Extension electrode regions 5c: End electrode regions

Claims (4)

A core having a core part, and an upper collar part and a lower collar part formed at both ends of the core part,
A conducting wire wound around the core;
An inductance element having a pair of terminal electrodes formed on the lower collar,
The lower collar includes an inner surface, a bottom surface, a pair of side surfaces, and a pair of end surfaces,
Each of the pair of terminal electrodes includes a main electrode region formed on the bottom surface of the lower collar portion, and at least one pair of extensions extending from the main electrode region in the direction of the pair of side surfaces of the lower collar portion. With an electrode area,
Both ends of the conducting wire are connected to the terminal electrode via the side surface and the bottom surface of the lower collar, respectively.
In the region where the both ends of the conductor on the bottom surface of the lower collar part pass, the disconnection is easily found when the conductor breaks in the vicinity of the side formed by the side surface and the bottom surface of the lower collar part. So that the extension electrode region of the terminal electrode is not formed ,
The extension electrode region of the other of the pair of extension electrode regions extends from the outer end of one extension electrode region of the pair of extension electrode regions along the extending direction of the pair of extension electrode regions. The first distance to the outer end and the second distance from one end of the main electrode region along the direction parallel to the extending direction to the other end are different from each other.
The first distance and the second distance are distances from one end to the other end of each of the plurality of land electrodes on which the pair of terminal electrodes are to be mounted along a direction parallel to the extending direction. An inductance element that is determined based on this .   2. The inductance element according to claim 1, wherein a concave portion for passing the conductive wire is formed on the side surface of the lower collar portion.   3. The inductance element according to claim 1, wherein each of the pair of terminal electrodes further includes an end surface electrode region formed on the end surface of the lower collar portion. The extension electrode region of the terminal electrode is formed reached respectively with the bottom surface of the lower flange portion to the side where the side surface is formed, the inductance element according to any one of claims 1 to 3.

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