Item management system, item management method, item detection instrument, and item detection device
An item management system includes: a placement member for placing an item, the placement member being at a first position when no item is placed on the placement member, the placement member moving from the first position to a second position when an item is placed on the placement member; a communication device attached to the placement member; a radio wave shield member configured to shield radio waves emitted from the communication device when the radio wave shield member is close to the communication device; a wireless device wirelessly communicating with the communication device; and a control device that acquires a result of whether communication by the wireless device with the communication device is possible, and determines whether the item is placed on the placement member, based on the result of whether the communication is possible.
1 . An item management system comprising:
a placement member for placing an item, the placement member being at a first position when no item is placed on the placement member, the placement member moving from the first position to a second position when an item is placed on the placement member;
a communication device attached to the placement member;
a radio wave shield member configured to shield radio waves emitted from the communication device when the radio wave shield member is close to the communication device;
a wireless device wirelessly communicating with the communication device; and
a control device that acquires a result of whether communication by the wireless device with the communication device is possible, and determines whether the item is placed on the placement member, based on the result of whether the communication is possible, wherein
when the placement member is at the first position, the communication device is separated from the radio wave shield member, and when the placement member is at the second position, the communication device is close to the radio wave shield member.
2 . The item management system according to claim 1 , wherein
the control device determines whether the item is placed on the placement member, based on a frequency at which the communication device transmits a signal.
3 . The item management system according to claim 1 , further comprising:
a reference communication device arranged at a position that is not close to the radio wave shield member regardless of whether an item is placed on the placement member, wherein
the wireless device communicates with the reference communication device, and
the control device acquires a result of whether communication by the wireless device with the reference communication device is possible.
4 . The item management system according to claim 1 , wherein
the communication device is a wireless tag that collects surrounding radio waves and converts the collected radio waves into electric power, the wireless tag including a capacitor that stores the electric power.
5 . The item management system according to claim 1 , wherein
the communication device is a UHF-band wireless tag.
6 . The item management system according to claim 1 , wherein
the communication device is an HF-band wireless tag.
7 . The item management system according to claim 1 , wherein
the communication device is a microwave-band wireless tag.
8 . The item management system according to claim 1 , further comprising:
an elastic member attached to the placement member, the elastic member biasing the placement member in a direction from the second position toward the first position when the placement member is at the second position.
9 . The item management system according to claim 8 , wherein the elastic member is a leaf spring.
10 . The item management system according to claim 8 , wherein the elastic member is a coil spring.
11 . The item management system according to claim 1 , further comprising:
a cushion arranged at a position shifted from the radio wave shield member in a first direction, wherein the first direction is defined as a direction in which the placement member moves from the first position to the second position.
12 . The item management system according to claim 1 , wherein
the radio wave shield member is a sheet member including a metal coating.
13 . An item management method comprising:
arranging an item detection instrument that includes a placement member, a communication device, and a radio wave shield member, the placement member being provided for placing an item and movable between a first position and a second position, a communication device being attached to the placement member, the radio wave shield member being configured to shield radio waves emitted from the communication device when the radio wave shield member is close to the communication device;
causing the placement member to be at a first position with no item placed on the placement member, resulting in the communication device being separated from the radio wave shield member, and thereby allowing a wireless device to communicate with the communication device;
causing the placement member to move to the second position with an item placed on the placement member, and resulting in the communication device being close to the radio wave shield member;
acquiring a result of whether communication by the wireless device with the communication device is possible; and
determining whether the item is placed on the placement member, based on the result of whether the communication is possible.
14 . An item detection instrument for detecting an item, comprising:
a placement member for placing an item, the placement member being at a first position when no item is placed on the placement member, the placement member moving from the first position to a second position when an item is placed on the placement member;
a communication device attached to the placement member; and
a radio wave shield member configured to shield radio waves emitted from the communication device when the radio wave shield member is close to the communication device, wherein
when the placement member is at the first position, the communication device is separated from the radio wave shield member, and when the placement member is at the second position, the communication device is close to the radio wave shield member.
15 . An item detection device comprising a plurality of item detection instruments arranged in a matrix and each provided for detecting an item,
the plurality of item detection instruments each including:
a placement member for placing an item, the placement member being at a first position when no item is placed on the placement member, the placement member moving from the first position to a second position when an item is placed on the placement member;
a communication device attached to the placement member; and
a radio wave shield member configured to shield radio waves emitted from the communication device when the radio wave shield member is close to the communication device, wherein
when the placement member is at the first position, the communication device is separated from the radio wave shield member, and when the placement member is at the second position, the communication device is close to the radio wave shield member.
16 . An item management method comprising:
arranging the item detection device according to claim 15 ;
acquiring a result of whether communication by a wireless device with the communication device, for each of the plurality of item detection instruments included in the item detection device;
determining whether an item is placed on the item detection instrument, for each of the plurality of item detection instruments, based on the result of whether the communication is possible; and
with reference to position information of where each of the plurality of item detection instruments is arranged, displaying information of whether an item is placed on the item detection instrument for each of the plurality of item detection instruments, on a display device, in a matrix to be associated with the position information of the plurality of item detection instruments.