Contactless IC card reader and data reading method

Patent metadata

Field	Value
Publication number	US-8937533-B2
Application number	US-200913058249-A
Country	US
Kind code	B2
Filing date	Aug 6, 2009
Priority date	Aug 11, 2008
Publication date	Jan 20, 2015
Grant date	Jan 20, 2015

Abstract

A contactless IC card reader and a data reading method which are capable of improving data reading accuracy while preventing a decrease in processing speed. Specifically, in a contactless IC card reader which transmits signals composed of amplitude modulated carrier signals to a contactless IC card, the contactless IC card and reader communicate by means of an NRZ encoding method and an ASK modulating method for which the modulation depth has an arbitrary value. The contactless IC card reader is provided with a contactless control means which modulates/demodulates signals transmitted to/received from the contactless IC card, and a main control means which is electrically connected to the contactless control means and that controls the entire card reader. The modulation depth that is varied by the contactless control means based on the command sent from the main control means has multiple range widths with an arbitral value as the standard.

First claim

What is claimed is:

1. A contactless IC card reader configured to transmit signals composed of amplitude modulated carrier signals to a contactless IC card, comprising:
a loop antenna;
a contactless control means configured to modulate/demodulate signals transmitted to/received from the contactless IC card; and
a main control means which is electrically connected to the contactless control means and administers the control of the entire card reader;
wherein the contactless I…

Assignees

• Takeuchi Junro
• Nidec Sankyo Corp

Inventors

• Takeuchi Junro

Classifications

• H04B5/26

  Electricity · mapped topic

• G06K7/0008 Primary

  Physics · mapped topic

• G06K7/10198

  Physics · mapped topic

• H04B5/0031

  Electricity · mapped topic