The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1995
Filed:
Dec. 20, 1993
Takeshi Inoue, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A non-contact IC card, a non-contact IC card terminal and a non-contact IC card system for performing data communication between the IC card and the terminal by using electromagnetic waves are arranged so that the IC card can reliably receive data transmitted from the terminal once the IC card is started up by a startup signal from the terminal. A selection circuit, under the control of a CPU selects a receiving amplifier having a smaller amplification factor in a startup step for receiving the startup signal and a receiving amplifier having a larger amplification factor in a data communication step for exchanging data signals. The sensitivity with which the data signal is received is thereby increased relative to the sensitivity with which data signals are received.