Coil component, electronic component, and electronic apparatus

A coil component including a terminal for external connection to which a plurality of secondary-side winding wires are connected, and a gathering member that gathers vicinities of terminal ends of the plurality of winding wires.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Phase of International Patent Application No. PCT/JP2017/002650 filed on Jan. 26, 2017, which claims priority benefit of Japanese Patent Application No. JP 2016-063174 filed in the Japan Patent Office on Mar. 28, 2016. Each of the above-referenced applications is hereby incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present technology relates to a coil component, an electronic component, and an electronic apparatus.

BACKGROUND ART

In recent years, an electronic apparatus such as a television device and a smartphone is being made thinner, and accordingly, a power supply circuit board and inner structural components (electronic components) are also being made thinner. A transformer is used as one of such structural components (for example, see Patent Literature 1 below). In such a transformer, it is usual practice to perform soldering with a terminal end of a secondary-side winding wire secured to a terminal (pin).

CITATION LIST

DISCLOSURE OF INVENTION

Technical Problem

Since a large current flows in a transformer depending on the application, it is necessary to adapt to a large current by increasing the wire diameter of a secondary-side winding wire, increasing the number of bundles, or connecting a plurality of winding wires in parallel. However, in the case of connecting the terminal end of a winding wire to a terminal in this manner, thickening of a secured point may cause that point and an adjacent terminal to come into contact and cause a short circuit. In addition, a plurality of winding wires may fall apart to come into contact. If the interval between terminals is increased in order to avoid this, a problem arises in that the transformer increases in size.

Therefore, the present technology has an object to provide a coil component, an electronic component, and an electronic apparatus that are adaptable to a large current and reduced in size.

Solution to Problem

To solve the above-described problem, the present technology is, for example, a coil component including: a terminal for external connection to which a plurality of secondary-side winding wires are connected; and a gathering member configured to gather vicinities of terminal ends of the plurality of winding wires.

In addition, the present technology is, for example, an electronic component including: a winding body part around which a plurality of winding wires are wound; and a gathering member configured to gather vicinities of terminal ends of the plurality of winding wires so as to be laminated in a winding direction.

In addition, the present technology is, for example, an electronic apparatus including: a first functional block; a second functional block; and a transformer including a first secondary-side winding wire configured to supply a first current to the first functional block and a second secondary-side winding wire configured to supply a second current larger than the first current to the second functional block.

Advantageous Effects of Invention

According to at least one embodiment of the present technology, a coil component that is adaptable to a large current can be reduced in size. Note that effects described herein are not necessarily limited, but any effect described in the present technology may be obtained. In addition, the contents of the present technology should not be construed limitedly by the illustrated effects.

MODE(S) FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment(s) of the present technology and the like will be described with reference to the drawings. Note that description will be provided in the following order.

1. One Embodiment

An embodiment(s) and the like which will be described below are suitable specific examples of the present technology, and the contents of the present technology are not limited to these embodiment(s) and the like. Note that description of sizes, materials, shapes, their relative arrangement, directions such as vertical and horizontal, and the like of structural components described in one embodiment and the like are not intended to limit the scope of the present technology only to them, but are mere description examples unless there is particularly limiting description.

1. One Embodiment

Structural Example of Transformer

1. One Embodiment

Structural Example of Transformer

In one embodiment which will be described below, a transformer for use in a thin television device as a coil component will be described as an example.FIGS.1A and1Bshow diagrams for describing a structural example of a transformer1according to one embodiment, in whichFIG.1Ais a top view of the transformer1, andFIG.1Bis a side view as seen from a direction of an arrow AA inFIG.1A. In addition,FIG.2is a diagram showing a partial structure of the transformer.

The transformer1includes a core10, a primary-side bobbin20, a secondary-side bobbin30, terminal plates41,42, and a gathering member50, for example. A primary-side winding wire is wound around the primary-side bobbin20, and a secondary-side winding wire is wound around the secondary-side bobbin30.

The core10includes a first core10aand a second core10b. The first and second cores10aand10binclude E-type cores, for example, and are arranged such that the respective leg parts of the first and second cores10aand10bare opposite to each other. The respective middle legs of the first and second cores10aand10bare inserted into holes formed generally at the center of the transformer1.

As a material of the core10, a magnetic substance such as ferrite can be used. Depending on the application of the transformer1, it is also possible to change the material of the core10from ferrite to a silicon-containing material such as a highlight material, an orient material, or an amorphous material, and permalloy or the like can also be used as the material of the core10.

The primary-side bobbin20includes a cylindrical winding body part21, an elliptical collar part22A formed on one end side of the winding body part21, and a flat-plate-like collar part22B formed on the other end side of the winding body part21.

The secondary-side bobbin30includes a cylindrical winding body part31, an elliptical collar part32A formed on one end side of the winding body part31, and a flat-plate-like collar part32B formed on the other end side of the winding body part31. Examples of materials of the primary-side and secondary-side winding body parts20and30can include polyethylene terephthalate, phenolic resin, polybutylene terephthalate, polyethylene, and the like.

As shown inFIG.2, the collar part22A and the collar part32A are arranged so as to be partially laminated, and the collar part22B and the collar part32B are arranged so as to be partially laminated. By winding an exterior tape13around the outer peripheral surface of the core10, for example, the respective components of the transformer1are integrated. Note that the model number of the transformer1and the like can be printed on the surface of the exterior tape13.

A primary winding wire (primary coil) C1including an insulation coated wire or the like such as a litz wire or stranded wire is wound around the winding body part21by a predetermined number of turns. A secondary-side winding wire such as a litz wire or stranded wire is wound around the winding body part31by a predetermined number of turns. In the present embodiment, a secondary winding wire (secondary coil) C2, a tertiary winding wire (tertiary coil) C3, and a quaternary winding wire (quaternary coil) C4are wound around the winding body part31.

The terminal plate41and the terminal plate42are attached to the both ends of the collar part22B in the lateral direction. The terminal plates41and42may be configured integrally with the collar part22B or the like, or may be freely removable. The terminal plate41and the terminal plate42are provided with a predetermined number of terminals44and45, respectively. In the present embodiment, the terminal plate41is provided with two linear terminals44aand44bin a manner extending downward. In addition, the terminal plate42is provided with seven terminals45a,45b, . . . ,45ghaving a generally L-shape in a manner protruding to the outside (the outside of the winding body part21in the axial direction) and having the leading ends extending downward. The terminals44and45include copper, copper alloy, or the like. The terminals45to which the secondary-side winding wires are connected are used as terminals whose polarity corresponds to the ground (GND) in accordance with the control system of the transformer1.

The gathering member50is a member that gathers vicinities of terminal ends of a plurality of secondary-side winding wires. As the material of the gathering member50, an electrically conductive member such as metal (for example, aluminum) can be used. Note that illustration of the gathering member50is omitted inFIGS.1A1B and2, and details of the gathering member50will be described later.

As to Secondary-Side Winding Wires

Next, secondary-side winding wires for use in the transformer1will be described in detail. The present embodiment adopts a structure in which a plurality of types of winding wires are used as the secondary-side winding wires to enable a plurality of outputs (multi-output). The secondary winding wire C2is adaptable to 60V (volt) output, for example, and is used as one example for a power supply for a backlight which is one of functional blocks of an electronic apparatus such as a television device, for example. In the case of this application, the need for adapting the secondary winding wire C2to a large current is not very high. On the other hand, the tertiary winding wire C3and the quaternary winding wire C4are adaptable to 12V output, for example, and are connected to terminals to which an external apparatus for universal serial bus (USB) or the like is connected, and are thus used for various applications. In the case where there are a plurality of terminals for USB or the like, a functional block for supplying a sufficient current to all of these terminals for USB or the like requires a large current. Thus, the need for adapting the tertiary winding wire C3and the quaternary winding wire C4to a large current is higher than the secondary winding wire C2.

To address such a need, it is considered to increase the wire diameter of the tertiary winding wire C3and the quaternary winding wire C4to become thick, whilst a problem caused by thickening of the winding wires may arise as described above. Therefore, the present embodiment adopts a structure in which the tertiary and quaternary winding wires C3and C4include a plurality of (for example, three) winding wires (wire rods), and the terminal ends of the plurality of winding wires are gathered by the gathering member50. With this structure in which lead wires are connected in parallel, a current flowing in one winding wire can be reduced, and ultimately, a current obtained by combining (adding) currents flown in the respective winding wires can be output from the terminal. In addition, since the winding wires do not become thick, it is possible to prevent the difficulty in winding the winding wires around the bobbins. Note that it is preferable to equalize the three winding wires in wire diameter in order to prevent current fluctuation.

As to Example of Connection

FIG.3is a diagram showing an example of connection of the winding wires in the transformer1. The starting point (start of winding) and end point (end of winding) of the primary winding wire C1are connected to the terminals44aand44b, respectively, by soldering or the like. The starting point and end point of the secondary winding wire C2are connected to the terminals45aand45c, respectively, and the center tap is connected to the terminal45b, for example.

Vicinities of terminal ends (the starting point and end point) of the tertiary winding wires C3including three winding wires are gathered by the gathering member50, and are connected to the terminals45dand45e, respectively. Note that, in the vicinities of the terminal ends of the tertiary winding wires C3, an insulation coating material is peeled. Similarly, vicinities of terminal ends of the quaternary winding wires C4including three winding wires are gathered by the gathering member50, and are connected to the terminals45fand45g, respectively. Similarly to the vicinities of the terminal ends of the tertiary winding wires C3, the insulation coating material is peeled in the vicinities of the terminal ends of the quaternary winding wires C4. Note that the vicinities of the terminal ends may be locations including the starting point or end point of the winding wires.

As to Gathering Member

Next, an example of the gathering member50will be described with reference toFIGS.4A,4B,4C,4D,5A,5B,5C,5D,5E,5F,5G, and5H. Note that, in the following description, an example of gathering the vicinities of the end points of the tertiary winding wires C3in the vicinity of the terminal45efor connection to the terminal45ewill be described, whilst matters which will be described below can also be applied similarly to the case of gathering the vicinities of the starting points of the tertiary winding wires C3for connection to the terminal45dor the case of gathering the vicinities of the terminal ends of the quaternary winding wires C4for connection to the terminal45fand the terminal45g.

FIG.4Ais a diagram showing the gathering member50awhich is an example of the gathering member. The gathering member50ais a fitting having a generally U-shape cross section. The vicinities of the end points of the tertiary winding wires C3and the terminal45eare inserted into the inner space of the gathering member50apartitioned by the gathering member50a, and the gathering member50ais caulked to the inner side. Accordingly, the locations at which the insulation coating of the winding wires is peeled and the terminal45eare brought into contact to make electric connection. Note that electric connection may be made by soldering each of the winding wires and the terminal45e.

FIG.4Bis a diagram showing a gathering member50bwhich is another example of the gathering member. The gathering member50bis a fitting having an inverted U-shape cross section. Similarly to the gathering member50a, the vicinities of the end points of the tertiary winding wires C3and the terminal45eare inserted into the inner space partitioned in the gathering member50b, and the gathering member50bis caulked to the inner side. Accordingly, the locations at which the insulation coating of the winding wires is peeled and the terminal45eare brought into contact to make electric connection.

FIG.4Cis a diagram showing a gathering member50cwhich is another example of the gathering member. The gathering member50cis a wire member including wire metal (lead wire) or the like. By binding the vicinities of the terminal ends of the tertiary winding wires C3and the terminal45eby the gathering member50cso as to be tied together, the locations at which the insulation coating of the winding wires is peeled and the terminal45eare brought into contact to make electric connection.

FIG.4Dis a diagram showing a gathering member50dwhich is another example of the gathering member. The gathering member50dis a fitting having a circular cross section or an elliptical cross section, and having a hollow part. The vicinities of the end points of the tertiary winding wires C3and the terminal45eare inserted into the hollow part of the gathering member50d, and the gathering member50dis caulked to the inner side. Accordingly, the locations at which the insulation coating of the winding wires is peeled and the terminal45eare brought into contact to make electric connection.

As described above, even in the case where the tertiary winding wires C3and the like include a plurality of winding wires in order to adapt to a large current, the vicinities of their terminal ends are gathered by the gathering member50, and thus, it becomes possible to reliably connect and fix the winding wires and the terminal without the respective winding wires being released.

The examples shown inFIGS.4A,4B,4C, and4Dare examples in which the terminals45and the gathering member50are separate bodies, whilst the terminals45and the gathering member50may be integrated.FIGS.5A,5B,5C,5D,5E,5F,5G, and5Hare diagrams showing a plurality of examples of the gathering member50integrated with the terminals45(for example,45e), that is, the gathering member50also functioning as the terminals45.

A gathering member50eshown inFIG.5Aincludes a lead-out part51elead out from the terminal plate42, a connection part52eextending downward generally perpendicularly from the lead-out part51e, and a gathering part53eextending upward from the connection part52e. The connection part52eis connected to a control substrate not shown, or the like. The gathering part53epresents a generally U-shape, for example. By inserting the vicinities of the end points of the tertiary winding wires C3into the gathering part53e, and then caulking the gathering part53eto the inner side, electric connection between the tertiary winding wires C3and the terminal45eis made.

A gathering member50fshown inFIG.5Bpresents a shape generally similar to the gathering member50e, and includes a lead-out part51f, a connection part52f, and a gathering part53f. A different point from the gathering member50elies in the relative positional relationship between the connection part52fand the gathering part53f, and the remaining points are similar to the gathering member50e.

A gathering member50gshown inFIG.5Cincludes a lead-out part51glead out from the terminal plate42, a connection part52gextending downward generally perpendicularly from the lead-out part51g, and a gathering part53gextending upward from the connection part52g. The gathering part53gis a clip-like member, and a member that allows the vicinities of the terminal ends of the tertiary winding wires C3to be inserted from above, for example. By inserting the vicinities of the end points of the tertiary winding wires C3into the gathering part53g, electric connection between the tertiary winding wires C3and the terminal45eis made. With this structure, it is possible to electrically connect the tertiary winding wires C3and the terminal45ewithout caulking the gathering member.

A gathering member50hshown inFIG.5Dincludes a lead-out part51hlead out from the terminal plate42, a connection part52hextending downward generally perpendicularly from the lead-out part51h, and a gathering part53hextending upward from the connection part52h. The gathering part53hpresents a ring shape having a hollow part, for example. By inserting the vicinities of the end points of the tertiary winding wires C3into the hollow part of the gathering part53h, and then caulking the gathering part53hto the inner side, electric connection between the tertiary winding wires C3and the terminal45eis made. Note that, if the size of the hollow part of the gathering part53his generally the same as the size of the tertiary winding wires C3, it is not necessary to caulk the gathering part53h.

In gathering members50iand50jshown inFIG.5EandFIG.5F, a lead-out part51i(a lead-out part51j), a connection part52i(a connection part52j), and a gathering part53i(a gathering part53j) are formed by bending a rod-like member in appropriate directions. By inserting the vicinities of the end points of the tertiary winding wires C3into the inner side of the gathering part53i(the gathering part53j), and then appropriately caulking the gathering part53i(the gathering part53j) to the inner side, electric connection between the tertiary winding wires C3and the terminal45eis made.

A gathering member50kshown inFIG.5Gis an example of a gathering member having no lead-out part. The gathering member50khas a support52k, and a gathering part53kis formed by bending the upper end of the support52kinto a generally U-shape, for example. By inserting the vicinities of the end points of the tertiary winding wires C3into the inner side of the gathering part53k, and then appropriately caulking the gathering part53kto the inner side, electric connection between the tertiary winding wires C3and the terminal45eis made. Note that, in the case of the present example, the proximity of the center of the support52k, for example, is supported by the terminal plate42, and the lower end of the support52kfunctions as a connection part.

A gathering member501shown inFIG.5Hincludes a lead-out part511lead out from the terminal plate42as well as a connection part521and a gathering part531extending in a generally perpendicular direction from the lead-out part511, and presents a generally T-shape. By winding the vicinities of the terminal ends of the tertiary winding wires C3around the gathering part531, the vicinities of the terminal ends are gathered. In this manner, the vicinities of the terminal ends of the tertiary winding wires C3may be wound around the gathering member. Note that, as long as the vicinities of the terminal ends of the tertiary winding wires C3can be wound, the shape of the gathering member501can be changed appropriately.

By integrating the gathering member with the terminal as described above, cost reduction because of a reduction in the number of components and simplification of manufacturing steps can be achieved.

Note that, when gathering the vicinities of the terminal ends of the three winding wires included in the tertiary winding wires C3, it is preferable to gather them so as to be laminated in the winding direction of the tertiary winding wires C3, in other words, in the thickness direction of the transformer1, as illustrated inFIGS.4A,4B,4C,4D,5A,5B,5C,5D,5E,5F,5G, and5H. From another perspective, it is preferable to gather the vicinities of the terminal ends of the three winding wires so as to be laminated in a direction different from the arrangement direction of the terminals45for external connection (in the present example, a generally perpendicular direction). In the case of the transformer1, since the tertiary winding wires C3and the like are wound around a predetermined bobbin, space is left on the outside of the winding location, specifically, above the terminal plate42. By gathering the plurality of winding wires utilizing this space effectively, the transformer1can be prevented from increasing in size. Note that the plurality of winding wires do not necessarily need to be laminated linearly, but may be laminated and gathered to a degree that fit in the above-described space.

One embodiment of the present technology has been specifically described above, whilst the contents of the present technology are not limited to the above-described embodiment, but various variants based on the technical idea of the present technology are possible.

In the above-described embodiment, an example of gathering the vicinities of the terminal ends of the three tertiary winding wires C3has been described, whilst the vicinities of the terminal ends of two or four or more tertiary winding wires C3may be gathered. The same applies to the quaternary winding wires C4.

The secondary winding wire C2may include a plurality of winding wires, and similarly to the above-described embodiment, the vicinities of the terminal ends of the plurality of winding wires may be gathered. However, since the need for adapting the secondary winding wire C2to a large current is low as described above, the need for thickening the winding wires or using a plurality of winding wires is also low. Therefore, a structure may be adopted in which a single winding wire is used for the secondary winding wire C2, the winding wire is secured and soldered to the terminal similarly to a general method, and only the vicinities of the terminal ends of the tertiary winding wires C3and the quaternary winding wires C4are gathered.

In the coil component according to the present technology, a plurality of gathering members may be used. For example, a structure may be adopted in which the vicinities of the terminal ends of the tertiary winding wires C3gathered by a metal wire as the gathering member are supported by a clip which is another gathering member and also serves as a terminal.

The winding method and the number of turns of the primary winding wire C1and the secondary winding wire C2may be set appropriately. For example, the secondary winding wire C2may be obtained by so-called bifilar winding of winding two wire rods around the secondary-side bobbin30concurrently in the same winding wire direction.

The transformer adapted to a plurality of outputs has been described in the above-described embodiment, whilst a transformer adapted to only one output (voltage) may be adopted. The output value can be set by appropriately changing the number of turns of winding wires or the wire diameter of the winding wires. In addition, the present technology is not limited to a transformer, but also applicable to other electronic components in addition to a coil component such as a choke coil.

The shape of the core10can be a shape in accordance with the shape of the transformer, such as a rod-like core, in addition to the E-type core. The shape of the primary-side and secondary-side winding body parts20and30can also be changed appropriately.

The structures, methods, steps, materials, numeric values, and the like listed in the above-described embodiment are merely examples, and structures, methods, steps, materials, numeric values, and the like different from these may be used according to necessity. In addition, matters described in the embodiment and variants can be combined to each other unless technical inconsistency arises.

A coil component including:

a terminal for external connection to which a plurality of secondary-side winding wires are connected; and

a gathering member configured to gather vicinities of terminal ends of the plurality of winding wires.

The coil component according to (1), in whichthe vicinities of the plurality of terminal ends are gathered in a vicinity of the terminal.
(3)

The coil component according to (1) or (2), in whichthe vicinities of the terminal ends of the plurality of winding wires are gathered so as to be laminated in a winding direction of the winding wires.
(4)

The coil component according to any of (1) to (3), in whichthe terminal and the gathering member are integrated.
(5)

The coil component according to any of (1) to (4), in whichthe secondary-side winding wires include a first winding wire in which a first current flows and a second winding wire in which a second current larger than the first current flows, and

the second winding wire includes a plurality of winding wires, and the vicinities of the terminal ends of the plurality of winding wires are gathered by the gathering member.

The coil component according to any of (1) to (5), in which

the gathering member includes an electrically conductive member.

The coil component according to any of (1) to (6), in which

the vicinities of the terminal ends of the plurality of winding wires are gathered so as to be laminated in a direction different from an arrangement direction of the terminal for external connection.

An electronic component including:

a winding body part around which a plurality of winding wires are wound; and

a gathering member configured to gather vicinities of terminal ends of the plurality of winding wires so as to be laminated in a winding direction.

An electronic apparatus including:

a first functional block;

a second functional block; and

a transformer including a first secondary-side winding wire configured to supply a first current to the first functional block and a second secondary-side winding wire configured to supply a second current larger than the first current to the second functional block.

The electronic apparatus according to (9), in which

the second functional block includes a plurality of external connection terminals configured to supply currents to a plurality of external connection apparatuses.

REFERENCE SIGNS LIST