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Antenna for detecting magnetic field, and gate for detecting detection tag employing the antenna

A technology for inspection labels and magnetic field detectors, applied in the size/direction of the magnetic field, antennas, antenna arrays, etc., and can solve the problem of inability to detect inspection label signals.

Inactive Publication Date: 2006-08-30
LINTEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, since the above-mentioned antennas 64 and 66 are formed large in a figure-of-eight shape, external noise generated in a wide range can be detected
As a result, there is a problem of sometimes not being able to detect the smaller check tag signal

Method used

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  • Antenna for detecting magnetic field, and gate for detecting detection tag employing the antenna
  • Antenna for detecting magnetic field, and gate for detecting detection tag employing the antenna
  • Antenna for detecting magnetic field, and gate for detecting detection tag employing the antenna

Examples

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Embodiment 1

[0048] to produce figure 1 door shown. The electric wire is wound in a loop shape with a length of 120 cm and a width of 60 cm to form the magnetic field generating coil 104 . The number of turns of the magnetic field generating coil 104 is 100 turns. Two loop antennas 106 and 108 wound in opposite directions are connected in series to the upper half of the loop surface of the magnetic field generating coil 104 . Each loop antenna has a length of 40 cm and a width of 10 cm, and the number of turns is 80. In addition, the interval between the loop antenna 106 and the loop antenna 108 is 14 cm, and the interval T between the magnetic field generating coil 104 and the loop antennas 106 and 108 is 23 cm.

[0049] Below the aforementioned loop antennas 106, 108, loop antennas 120, 122 having the same structure are installed. In addition, the intervals between the loop antennas and the intervals between the magnetic field generating coil 104 and the loop antennas 120 and 122 ar...

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PUM

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Abstract

The present invention discloses: an antenna for detecting a magnetic field, wherein a plurality of loop antennas wound in opposite directions are connected in series and placed in a plane, a magnetic field detector comprising a plurality of the above antennas for detecting a magnetic field and an output circuit for taking out a differential output between the outputs of the plurality of antennas, and a gate for detecting detection tag comprising the above magnetic field detector and a coil for magnetic field generation.

Description

technical field [0001] The present invention relates to an antenna for detecting a magnetic field for detecting a change in a magnetic field and detecting an inspection tag, a magnetic field detector using the same antenna, and a door for detecting an inspection tag. More specifically, the present invention relates to a magnetic field detection antenna comprising a plurality of loop antennas and having a high signal-to-noise ratio (S / N ratio), a magnetic field detector and a check tag detection gate using the same antenna. Background technique [0002] In the past, inspection labels using a magnetic field have been known (Japanese Patent Laid-Open No. 6-342065 (claim 1)). This inspection label using a magnetic field is pasted on a product, etc., moves with the product, and detects it when passing a designated door. Carry out circulation management of goods, or prevent the theft of goods. [0003] figure 2 Represents an example of past inspection labels. figure 2 Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/02G08B13/24G01S13/74G01V3/10H01Q21/00H04B5/48
CPCG01V3/104H01Q21/06G01R33/02G01V3/10H01Q17/00
Inventor 松井邦彦鸙野俊寿诸谷彻郎大石裕史
Owner LINTEC CORP