Nec Corporation

Hiroki Murayama

Shigeru Yamazaki

Shigeru Hatakeyama

Toshikazu Hashimoto

Jun Uchimura

Takahiko Tsujisawa

Koichi Hirano

Kouichi Hirano

A wireless communication system includes: a main antenna for radiating an electromagnetic wave to wireless IC chips; a reflecting plate for reflecting the electromagnetic wave from the main antenna to the wireless IC chips; and a control unit which supports the wireless IC chips. The control unit causes a difference between the receiving electromagnetic wave levels of a direct wave from the main antenna and a reflected wave from the reflecting plate received by the antenna of the wireless IC chip.

Wireless communication system and method

There is provided an article position management system which can determine where an article is present with high accuracy and manage the position of the article such that no article is left unchecked. Illumination sections (-) optically transmit pieces of positional information only to specific regions (lighting ranges (-)). A terminal device () receives the pieces of positional information transmitted from the illumination sections (-) and reads out article IDs from RFID tags (-) put on articles (-). The terminal device () sends the pieces of positional information and article IDs to a server () through a wireless LAN base station (). The server () stores the pieces of positional information and article IDs sent from the terminal device () such that the pieces of positional information and article IDs are associated with each other.

Article position management system, article position management method, terminal device, server, and article position management program

It is to provide a radio communication system capable of performing highly reliable reading/writing communication even though the RFID tags face in the random directions. The radio communication system comprises an RFID tag used for identification, a reader/writer for performing transmission and reception of information between the RFID tag by radio waves, and a plurality of reflecting plates in a space where a plurality of RFID tags are accumulated. The reflecting plates direct traveling direction of the radio wave irradiated from the reader/writer towards the RFID tags. A part of the radio waves irradiated from an antenna of the reader/writer is directed to travel three-dimensionally towards the space by the effect of the reflecting plates. Moreover, the radio waves traveling in the same direction among the reflected radio waves by the plurality of reflecting plates together allow attenuation caused due to distance to be reduced extremely.

Radio communication system

A track-following control system for a magnetic disk drive according to the present invention includes a magnetic disk, a magnetic head, a position error signal generator, a controller, and a stepping motor. One or more track position signals indicating a position of a track are recorded in the magnetic disk in numbers of sectors. The magnetic head writes and reads out normal data in and from the magnetic disk, and reads out the track position signal from the magnetic disk in the same manner. The position error signal generator generates a position error signal indicating a position error between the magnetic head and the track based on a track position signal. The controller calculates intra-sector errors by calculating an average position error of each sector and a desired number of estimated position errors of the corresponding sector by interpolation. Then, the controller produces, in numbers of the secotrs, position error signals having a larger number than that of the sectors by using a position error signal supplied from the position error signal generator. The stepping motor 18performs positioning of the magnetic head in accordance with the position error signals having the larger number than that of the sectors.

Growing community of inventors

Tokyo, Japan

Hiroki Murayama