Registers – Records – Conductive
Patent
1995-06-16
1997-07-29
Hajec, Donald T.
Registers
Records
Conductive
235451, 235439, 235449, 902 26, G06K 1906
Patent
active
056524234
ABSTRACT:
A battery-free non-contacting information card of a relatively simple arrangement which prevents an IC chip or the like from being destroyed by an excess voltage. This non-contacting information card includes a resonance circuit (3) for receiving a carrier signal (e.g., FSK signal) modulated on the basis of information supplied from a card reader/writer (2), an information processing system (5), (6), (7) for obtaining information from the carrier signal and a rectifier system (13) for obtaining a voltage by rectifying the carrier signal, wherein the non-contacting information card can be operated by the voltage obtained at the output side of the rectifier circuit (13). The resonance circuit (3) includes a variable capacitive element (3d). A resonance frequency of the resonance circuit (3) is varied by varying the capacity value of the variable capacitive element (3d) in response to the voltage value obtained at the output side of the rectifier circuit (13) to thereby make the voltage value obtained at the output side of the rectifier circuit (13) substantially constant.
REFERENCES:
patent: 3641462 (1972-02-01), Fujimura
patent: 3969678 (1976-07-01), Asahara et al.
patent: 4650981 (1987-03-01), Foletta
patent: 4814595 (1989-03-01), Gilboa
patent: 4837556 (1989-06-01), Matsushita et al.
patent: 5434396 (1995-07-01), Owen et al.
patent: 5502295 (1996-03-01), Owen et al.
Fujimoto Masahiro
Orihara Katsuhisa
Saitoh Shoshichi
Yanagibori Susumu
Hajec Donald T.
Lee Michael G.
Maioli Jay H.
Sony Chemicals Corporation
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