Abstract: A first object of the present invention resides in providing a novel installation structure for an RFID tag, which effectively protects the RFID tag from external stress or impact during the storage, transportation and usage, and allows communication with the external. A second object of the present invention resides in that providing a novel installation structure for an RFID tag, which enables communication with the external even if the RFID tag is installed on a conductive member such as a metal member, and the surface thereof is covered with a protective member typically made of a metal which has an excellent strength and durability. A third object of the present invention is to provide a communication method using an RFID tag as being surrounded by a conductive member typically made of a metal.

Abstract: An object of the present invention is to allow a communication device which is based on a new principle by an electromagnetic induction method and an opening/closing system employing the communication device to be provided. The structure thereof is characterized in that at least an antenna coil 2 of a transmitting/receiving section 3 of the communication device 1 is protected by a metal layer 4 which is formed to have a thickness through which the communication device 1 can communicate with a data carrier 5 by an electromagnetic induction effect.

Abstract: This invention aims to provide a communication device, installation structure for the communication device, a method of manufacturing the communication device, and a method of communication with the communication device in which the communication device is able to exceedingly restain a conductive material from attenuating magnetic flux and to expand communication distance even when the communication device is attached to a conductive member e.g., metal, in a closely contacting manner. This invention has a sheet-like amorphous magnetic material being arranged in a manner extending from a magnetic flux generating portion of a concentric disk-shaped antenna coil of an RFID tag serving as the communication device to an outer area of the antenna coil.

Abstract: An RFID tag installing structure for installing a microminiaturized RFID tag having a cylindrical antenna coil to a conductive member, an RFID installing method, and communication method are disclosed. An RFID tag (1) having a cylindrical antenna coil (2) and shaped into a rod is characterized in that the axial direction of the RFID tag (1) is parallel to the installation surface composed of the bottom surface (7a) of an installation groove (7) made in a conductive member (5) and is in contact with the installation surface.

Abstract: A first object of the present invention resides in providing a novel installation structure for an RFID tag, which effectively protects the RFID tag from external stress or impact during the storage, transportation and usage, and allows communication with the external.

Abstract: An RFID tag installing structure for installing a micorminiaturized RFID tag having a cylindrical antenna coil to a conductive member, an RFID installing method, and communication method are disclosed An RFID tag (1) having a cylindrical antenna coil (2) and shaped into a rod is characterized in that the axial direction of the RFID tag (1) is parallel to the installation surface composed of the bottom surface (7a) of an installation groove (7) made in a conductive member (5) and is in contact with the installation surface.

Abstract: A communication device having a long communication range by greatly suppressing the attenuation of the magnetic flux because of a conductive member even if the communication device is installed near the conductive member such as of metal. Its installation structure, manufacturing method, and communication method are also disclosed. An RFID tag (1a) serving as a communication device (12) is characterized in that an amorphous magnetic sheet (5) extends from a magnetic flux generation portion (A) of a concentric display antenna coil (2a) of the RFID tag (1a) toward the outside of the antenna coil (2a).

Abstract: The present invention is provided with a key hole insertion fitted to a manhole cover, a manhole cover locking apparatus equipped with the key hole insertion, a manhole cover locking system, a method for unlocking the manhole cover, and a control system for opening and a closing manhole cover, which is designed to prevent an external access to the key hole of the manhole cover, thus attaining a sound and severe locking management. The electrical locking assembly can be added to conventional manhole covers in a simple way. The structure of the invention is characterized in a key hole insertion A inserted in a key hole 3b of the inner manhole cover 3 or the key hole 5b of the manhole cover 5 enough to engage pins 11b with engaging openings 12b of the cap holding member 12 secured to the key hole 3b or the key hole 5b. This allows the key hole insertion A to be locked to the key hole 3b or the key hole 5b.