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Portable electronic device

An electronic device, portable technology, used in the direction of instruments, computing, loop antennas with cores of ferromagnetic material, etc.

Inactive Publication Date: 2011-07-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the magnetic flux from the reader / writer cannot be interlinked (magnetic flux in the direction perpendicular to the axial direction of the magnetic core 600), and communication with the reader / writer cannot be performed.
[0008] Also, in the antenna coil 610 shown in Patent Document 2, the magnetic flux is shielded by the substrate and the metal case, so there is almost no direction to the magnetic core 611. Magnetic Flux Orthogonal to the Axis
However, the antenna coil 610 has a portion where the coil is not wound at the orthogonal portion between the first shaft portion 611a and the second shaft portion 611b of the L-shaped magnetic core 611, and it is considered that the direction and the axial direction are not perpendicular at the orthogonal portion. However, since the antenna coil 610 is mounted in the central region of the substrate, the reluctance of the end face of the magnetic core 611 becomes large, making it difficult to introduce magnetic flux into the antenna coil 610.
That is, there is a problem that the antenna coil 610 of Patent Document 2 does not link with the magnetic flux from the reader / writer (magnetic flux in a direction perpendicular to the axial direction of the magnetic core 611), and cannot communicate with the reader / writer.

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0065] based on figure 1 as well as figure 2 A portable electronic device related to the first embodiment will be described.

[0066] figure 1 It is a figure which shows the main part of the portable electronic device concerning this 1st Embodiment. figure 1 (A) is a perspective view, figure 1 (B) is a top view. figure 2 to indicate that the figure 1 A schematic diagram of an example of a magnetic flux path in a state where the portable electronic device is covered with an RFID reader.

[0067] A portable electronic device 280 according to the first embodiment includes a circuit board 100 and an antenna coil 200 mounted on the circuit board 100 . As the circuit board 100 , a circuit board having a rectangular shape with a length of 90 mm in the longitudinal direction and a width of 45 mm in the short direction was used. The antenna coil 200 includes a magnetic core 201 made of ferrite or the like, and a coil 202 wound around the outer periphery of the magnetic co...

no. 2 approach

[0093] based on Figure 12 A portable electronic device related to the second embodiment will be described.

[0094] Figure 12 It is a front view of the portable electronic device related to the second embodiment. In addition, in Figure 12 , in the same way as that representing the first embodiment figure 1 Descriptions are appropriately omitted in the same or corresponding parts.

[0095] Such as Figure 12 As shown, the portable electronic device 280 of the second embodiment includes a circuit board 100 and an antenna coil 200 mounted on the circuit board 100 . Such as Figure 12 As shown, the antenna coil 200 has a predetermined gap with the circuit board 100 and is mounted on the circuit board 100 . The antenna coil 200 is mounted with a predetermined gap from the circuit board 100 by, for example, bonding to a case provided above the circuit board 100 . Thus, by forming a predetermined gap between the circuit board 100 and the antenna coil 200, the antenna coil...

no. 3 approach

[0099] based on Figure 13 A portable electronic device according to a third embodiment of the present invention will be described.

[0100] Figure 13 It is a diagram showing main parts of a portable electronic device related to the third embodiment. Figure 13 (A) is a perspective view, Figure 13 (B) is a top view.

[0101] Such as Figure 13 As shown in (A), a portable electronic device 480 according to the third embodiment includes a circuit board 300 and an antenna coil 400 mounted on the circuit board 300 . The circuit board 300 is, for example, a circuit board formed in a rectangular shape with a length of 90 mm in the long direction and a width of 45 mm in the short direction. The antenna coil 400 is arranged on the circuit board 300 so that the direction of its coil axis is the same as the direction of the short side of the circuit board 300 . In addition, the antenna axis direction of the antenna coil is the same as the coil axis direction of the magnetic core...

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PUM

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Abstract

A portable electronic device includes a circuit board and an antenna coil installed on the circuit board. The antenna coil includes a magnetic core and a coil wound at either side of an unwound portion. The winding direction of the coil is changed at either side of the unwound portion. When the length of the magnetic core is defined as X and the distance between two intersecting points at which avirtual line formed by projecting the central line of the magnetic core onto the circuit board intersects the outer periphery of the circuit board is defined as Y, the antenna coil satisfies Y>=X>=0.8Y.

Description

technical field [0001] The present invention relates to a portable electronic device such as a mobile phone terminal equipped with a wireless tag for RFID (Radio Frequency Identification) that communicates with external devices through electromagnetic field signals. Background technique [0002] In portable electronic devices such as mobile phones equipped with RFID wireless tags that have become widespread in recent years, for example, as described in Patent Document 1, the antenna coil of the wireless tag is arranged in the portable electronic device. Figure 17 It is a perspective view showing main parts of a portable electronic device 800 shown in Patent Document 1. FIG. Figure 17 The figure shows a configuration in which a cylindrical antenna coil 600 having a magnetic core 601 is arranged on a substrate 500 of a portable electronic device 800 . The antenna coil 600 is arranged such that its axial direction is parallel to the plane direction of the substrate 500 , and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q7/08G06K19/07G06K19/077H04B5/48
CPCH01Q7/08
Inventor 久保浩行伊藤宏充用水邦明小林英一
Owner MURATA MFG CO LTD