INFORMATION ACCESS SYSTEM, CONTACTLESS READER AND WRITER DEVICE, AND CONTACTLESS INFORMATION STORAGE DEVICE
First Claim
1. An information access system comprising:
- a reader and writer device comprising;
a first memory,a first control unit,a first timing generator for measuring time,a sleep time period setter unit for determining an identification carried by a response signal received in a period of time, and a length of a sleep period of time depending on a number of received identifications,a first transmitter unit for repeatedly transmitting either one of an information request signal and an information and sleep request signal carrying a length of the sleep period of time and the received identification, at a first frequency in a time period of transmission, anda first receiver unit for receiving a response signal carrying an identification at a second frequency which is different from the first frequency; and
a plurality of information storage devices, each comprising;
a second memory for storing an identification of that information storage device,a second timing generator for measuring time,a battery,a second control unit,a second receiver unit for sensing a carrier of an RF signal at the first frequency for detection, and further receiving the information request signal or the information and sleep request signal in response to detection of a carrier of an RF signal, anda second transmitter unit for, in response to reception of the information request signal or the information and sleep request signal carrying no identification of that information storage device, transmitting a response signal carrying the identification of that information storage device at the second frequency, and, in response to the reception of the information and sleep request signal carrying the identification of that information storage device, being caused by the second control of the second control unit to be in an inactive state during the sleep period of time.
1 Assignment
0 Petitions
Accused Products
Abstract
In a reader and writer device, a sleep period setter determines an identification in a received response, and a length of a sleep period depending on a number of received identifications, a first transmitter transmits either an information request or an information and sleep request carrying the sleep length and the received identification, and a first receiver receives a response carrying an identification. In each of information storage devices, a second receiver senses a carrier, and receives the information request or the information and sleep request in response to carrier detection, and a second transmitter, in response to the information request or the information and sleep request carrying no identification of that device, transmits a response carrying the identification of that device, and, in response to the information and sleep request carrying the identification of that device, is in an inactive state during the sleep time period.
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Citations
15 Claims
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1. An information access system comprising:
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a reader and writer device comprising; a first memory, a first control unit, a first timing generator for measuring time, a sleep time period setter unit for determining an identification carried by a response signal received in a period of time, and a length of a sleep period of time depending on a number of received identifications, a first transmitter unit for repeatedly transmitting either one of an information request signal and an information and sleep request signal carrying a length of the sleep period of time and the received identification, at a first frequency in a time period of transmission, and a first receiver unit for receiving a response signal carrying an identification at a second frequency which is different from the first frequency; and a plurality of information storage devices, each comprising; a second memory for storing an identification of that information storage device, a second timing generator for measuring time, a battery, a second control unit, a second receiver unit for sensing a carrier of an RF signal at the first frequency for detection, and further receiving the information request signal or the information and sleep request signal in response to detection of a carrier of an RF signal, and a second transmitter unit for, in response to reception of the information request signal or the information and sleep request signal carrying no identification of that information storage device, transmitting a response signal carrying the identification of that information storage device at the second frequency, and, in response to the reception of the information and sleep request signal carrying the identification of that information storage device, being caused by the second control of the second control unit to be in an inactive state during the sleep period of time.
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2. A contactless reader and writer device for reading and writing information in an information storage device in a contactless manner, comprising:
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a memory; a timing generator for measuring time; a control unit; a sleep time period setter unit for determining an identification carried by a response signal received from a contactless information storage device in a given period of time, and a length of a sleep period of time for the contactless information storage device depending on a number of received identifications; a transmitter unit for repeatedly transmitting either one of an information request signal and an information and sleep request signal carrying a length of the sleep period of time and the received identification, at a first frequency in a time period of transmission; and a receiver unit for receiving a response signal carrying an identification at a second frequency different from the first frequency that is transmitted by a contactless information storage device in response to the information request signal or the information and sleep request signal. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A contactless information storage device comprising:
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a memory for storing an identification of the contactless information storage device; a timing generator for measuring time; a battery; a control unit; a receiver unit for sensing a carrier of an RF signal at a first frequency in a particular cycle for detection, and further receiving an information request signal or an information and sleep request signal in response to detection of a carrier of an RF signal; and a transmitter unit for, in response to reception of the information request signal or the information and sleep request signal carrying no identification of the contactless information storage device, transmitting a response signal carrying the identification of the contactless information storage device at a second frequency different from the first frequency, and, in response to reception of the information and sleep request signal carrying the identification of the contactless information storage device, being caused by the control unit to be in an inactive state during the sleep period of time. - View Dependent Claims (11, 12)
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13. A machine-readable storage medium storing a program thereon for operating a contactless reader and writer device comprising a memory, a timing generator and a control unit and for reading and writing information in an information storage device, the program being operable to effect:
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receiving a response signal carrying an identification at a second frequency different from the first frequency that is transmitted by a contactless information storage device; detecting an identification carried by a response signal received from the contactless information storage device in a given period of time; determining a length of a sleep period of time for the contactless information storage device depending on a number of received identifications; and repeatedly transmitting either one of an information request signal and an information and sleep request signal carrying a length of the sleep period of time and the received identification, at the first frequency in a time period of transmission.
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14. A machine-readable storage medium storing a program thereon for operating a contactless information storage device comprising a memory, a timing generator and a control unit, the program being operable to effect:
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sensing a carrier of an RF signal at a first frequency in a particular cycle for detection; receiving an information request signal or an information and sleep request signal in response to detection of a carrier of an RF signal; in response to reception of the information request signal or the information and sleep request signal carrying no identification of the contactless information storage device, transmitting a response signal carrying the identification of the contactless information storage device at a second frequency different from the first frequency; and in response to reception of the information and sleep request signal carrying the identification of the contactless information storage device, disabling the transmitting to be in an inactive state during the sleep period of time.
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15. A method of operating a contactless reader and writer device comprising a control unit, a transmitter unit and a receiver unit, and for reading and writing information in an information storage device, the method comprising:
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causing the receiver unit to receive a response signal carrying an identification at a second frequency different from the first frequency that is transmitted by a contactless information storage device; causing the control unit to detect an identification carried by a response signal received from the contactless information storage device in a given period of time; causing the control unit to determine a length of a sleep period of time for the contactless information storage device depending on a number of received identifications; and causing the transmitter unit to repeatedly transmit either one of an information request signal and an information and sleep request signal carrying a length of the sleep period of time and the received identification, at the first frequency in a time period of transmission.
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Specification