JP2007305820A - Laminated flat coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat coil which is optimum for a power transmission coil. <P>SOLUTION: In a laminated flat coil, a spiral conductor pattern 2 is formed on a substrate 1. A plurality of substrates 1 having similar spiral conductor patterns 2 formed thereon are positioned and laminated. At least start and termination ends 3, 4 of upper and lower ones of the laminated spiral conductor patterns 2 are electrically connected each other to form a coil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a planar coil having a winding made of a conductor pattern formed by arranging conductors in a spiral shape in a substrate plane.

  In general, as a coil for passing a large current, such as a power transmission coil, a single wire or a wire wound with a litz wire is used. However, in this case, there are problems that the volume increases and the inductance varies greatly.

Therefore, a conductor pattern formed by arranging conductors in a spiral shape in a plane or a plurality of spiral conductor patterns (Patent Document 1) or a plurality of spiral conductor patterns are stacked and arranged in series. A multi-layered structure in which a connection is made (Patent Document 2) or a substrate in which windings are arranged on a flat plate, and the ends of each winding are connected in order to connect each winding portion in series. Has been proposed (Patent Document 3) in which a core tube made of a magnetic material is disposed at the center of the core.
JP2002-280230 JP2005-5595 International Publication WO02 / 089157

  Since the laminated planar coil described above is arranged in series by sequentially connecting the winding portions (conductor patterns) of each layer, the total number of turns of the winding in each layer becomes the number of turns of the entire coil, and the resistance value is large. Therefore, there is a problem that it is not suitable for a power transmission coil.

  This invention is made paying attention to such a point, and it aims at providing the planar coil optimal for the coil for electric power transmission.

  In order to achieve the above-mentioned object, the present invention according to claim 1 is configured such that a plurality of substrates on which a spiral conductor pattern having the same shape is formed are stacked and arranged at least at the start and end portions of the stacked conductor patterns. It is characterized in that the conductive patterns located above and below are electrically connected.

  Further, according to the present invention, a plurality of substrates on which the same spiral conductor pattern is formed are arranged in a stacked manner, and the conductor patterns located at the top and bottom of the substrate are electrically connected to each other. In addition, it is characterized in that the upper and lower conductor patterns are electrically connected to each other at an intermediate portion located at the same length from the start end of the conductor patterns that are arranged in a stacked manner.

  In the first aspect of the present invention, a plurality of substrates on which the same spiral conductor pattern is formed are arranged in a stacked manner, and the conductor patterns positioned at the top and bottom at least at the start and end portions of the stacked conductor patterns are arranged. Are electrically connected, a plurality of coils having equivalent performance are arranged in parallel. Thereby, the coil which has an effect equivalent to the planar coil using a litz wire, and can flow a large current can be formed. And since it is a substrate pattern, individual variations can be suppressed, and the thickness and weight can be reduced.

  In the invention described in claim 2, the start end portion and the end portion of the same spiral conductor pattern arranged in a stacked manner are electrically connected to each other, and the upper end and the lower end are located at the same phase at the intermediate portion. Since the conductor patterns are electrically connected to each other, a plurality of terminal portions can be formed from the planar coil, and a plurality of coils having different capabilities can be formed by combining the terminals.

  FIG. 1 shows an embodiment of the present invention, FIG. 1 is a plan view of a planar laminated coil, and FIG. 2 is an end view taken along line AA of FIG. This planar laminated coil is printed on a film-like substrate (1) in a spiral shape with a conductor to form a spiral conductor pattern (2), and the substrate on which the spiral conductor pattern (2) is formed ( A plurality of 1) are laminated (six in the figure). In this case, the substrate (1) to be laminated is composed of the same spiral conductor pattern (2). And the conducting wire pattern (2) which has positioned the start part (3) and termination | terminus part (4) of each laminated spiral conductor pattern (2) up and down using a through hole (5a) (5b). ) Are electrically connected to each other.

  The starting end portion (3) located on the outer peripheral side of the spiral conductor pattern (2) is electrically connected to the terminal terminal (6a) on the upper surface of the substrate (1a) located on the uppermost layer. On the other hand, in the terminal portion located on the center side of the spiral conductor pattern (2), the lead wire portion (7) is led out from the lower surface of the substrate (1n) located in the lowermost layer toward the outer periphery, and the lead wire portion ( The lead-out end of 7) is electrically connected to the terminal terminal (6b) on the upper surface of the substrate (1a) located in the uppermost layer by a through hole (5c).

  In the coil having the above-described configuration, a plurality of coils having the same shape and the same size are arranged in parallel, so that the conductive resistance of the coil as a whole is reduced, and a large current can flow and a self-vortex Current loss due to current is reduced. In addition, since coils having the same shape and the same dimensions are laminated, the gaps of the patterns coincide in all layers, a path of magnetic flux can be formed, and the efficiency can be improved. Further, the inductance required for the electromotive force of power transmission can be ensured by the lamination.

  FIG. 3 shows another embodiment of the present invention, which, like the above-described embodiment, forms a spiral conductor pattern (2) by printing and wiring in a spiral shape with a conductor on a film-like substrate (1). A plurality of substrates (1) on which the spiral conductor pattern (2) is formed are laminated (six in the figure). And the conducting wire pattern (2) which has positioned the start part (3) and termination | terminus part (4) of each laminated spiral conductor pattern (2) up and down using a through hole (5a) (5b). ) Are electrically connected to each other, and are electrically connected by a through hole (5d) penetrating the laminated substrate (1) at the intermediate portion of the spiral conductor pattern (2), and are located in the lowermost layer. The lead wire portion (7b) is led out from the lower surface of (1n) toward the outer periphery, and the lead-out end of the lead wire portion (7b) is a terminal on the upper surface of the substrate (1a) located at the uppermost layer by a through hole (5e). It is electrically connected to the terminal (6c). In this case, the intermediate portion of the spiral conductor pattern (2) refers to a portion located at the same length from the start end or the end portion of each spiral conductor pattern (2) formed in the same shape.

  Thus, when a plurality of laminated conductor patterns (2) are electrically connected at the intermediate portion of the spiral conductor pattern (2), a plurality of coils having different characteristics are included in one laminated coil. By selecting a plurality of terminal terminals (6a), (6b), and (6c) and connecting them to a device, for example, a power transmission coil and an information transmission coil can be combined into one laminated coil. Can coexist in.

  In the above-described embodiment, a film is used as the substrate, but a synthetic resin thin plate or a glass thin plate other than the film may be used.

  The laminated planar coil according to the present invention can be used as a power transmission coil for a non-contact charger in portable electronic devices such as mobile phones and PDAs.

It is a top view showing one embodiment of a plane lamination coil. It is an AA line end view of FIG. It is a top view which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2 ... Spiral conductor pattern, 3 ... Start end part of (2), 4 ... End part of (2).

Claims (3)

A plurality of substrates (1) on which the same spiral conductor pattern (2) is formed are stacked, and at least the start end (3) and the end (4) of the spiral conductor pattern (2) stacked. A laminated planar coil characterized in that a spiral conductor pattern (2) positioned above and below is electrically connected to each other to form a coil. The spiral conductor patterns (2) positioned above and below are electrically connected to each other at an intermediate portion located at the same length from the starting end of the spiral conductor patterns (2) positioned in a stacked manner. 2. The laminated planar coil according to 1. The laminated planar coil according to claim 1 or 2, wherein the substrate (1) is a resin film.

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