Radio communication system

• US 20080238658A1
• Filed: 03/15/2008
• Published: 10/02/2008
• Est. Priority Date: 03/27/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Yamada, Toshimichi
• Granted Patent: US 7,786,869 B2
• Time in Patent Office: Days
• US Class Current: 340/539.3
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 19/07703 the interface being visual

Abstract

There is provided a radio communication system including a first transceiver equipped with an antenna circuit and a transmitting-receiving unit and for transmitting a data signal by an electromagnetic wave, and a second transceiver equipped with an antenna circuit, a transmitting-receiving unit, a memory unit for storing the data signal, a display unit having display memory property, and a power source unit for obtaining an operation voltage for each unit from the electromagnetic wave. The first transceiver relatively varies the transmission output of the data signal to a high level or a low level, and the second transceiver receives the data signal and stores the data signal in the memory unit when the level of the transmission output of the data signal is low, and sends the data signal from the memory unit to the display unit when the level of the transmission output of the data signal is high.

Claims

1. A radio communication system comprising:

a first transceiver equipped with an antenna circuit and a transmitting-receiving unit and for transmitting a data signal by an electromagnetic wave; and

a second transceiver equipped with an antenna circuit, a transmitting-receiving unit, a memory unit for storing the data signal, a display unit having display memory property, and a power source unit for obtaining an operation voltage for each unit from the electromagnetic wave, wherein

the first transceiver relatively varies the transmission output of the data signal to a high level or a low level, and

the second transceiver receives the data signal and stores the data signal in the memory unit when the level of the transmission output of the data signal is low, and sends the data signal from the memory unit to the display unit when the level of the transmission output of the data signal is high.

2. The radio communication system according to claim 1, wherein the first transceiver sets the gain property of the antenna circuit to a wide band property when the level of the transmission output of the data signal is low and sets the gain property of the antenna circuit to a narrow band property when the level of the transmission output of the data signal is high.

3. The radio communication system according to claim 1, wherein the first transceiver sets the transmission gain property of the transmitting-receiving unit to a wide band property when the level of the transmission output of the data signal is low and sets the transmission gain property of the transmitting-receiving unit to a narrow band property when the level of the transmission output of the data signal is high.

4. The radio communication system according to claim 1, wherein the second transceiver sets the gain property of the antenna circuit to a wide band property when the level of the transmission output of the data signal is low and sets the gain property of the antenna circuit to a narrow band property when the level of the transmission output of the data signal is high.

5. The radio communication system according to claim 1, wherein the operation of the second transceiver is controlled by a data signal from the first transceiver.