Authentication system including electric field sensor
AssigneeFreescale Semiconductor, Inc.
InventorsAkihiro Zemba, Hidetaka Fukazawa
Life of this patent
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Abstract
An authentication system for reducing the power consumed during an authentication process and shortening the authentication time includes an electrode plate. The electrode plate has a unique shape that defines an authentication key. An electric field sensor detects capacitance corresponding to the shape of the electrode plate to generate a detection signal. A signal monitor compares the detection signal of the electric field sensor with a preset signal and generates a determination signal indicating the comparison result.
Claims10
An authentication system comprising:
- an electrode plate having a unique shape that defines an authentication key;
- an electric field sensor for detecting capacitance that is in correspondence with the shape of the electrode plate and generating a detection signal;
- and
- a signal monitor for comparing the detection signal of the electric field sensor with a preset signal and generating a determination signal indicating the comparison result.
An authentication system for incorporation in a device including a main body and a subject product for use with the main body, the authentication system comprising:
- a first authentication unit;
- and
- a second authentication unit;
- wherein the first authentication unit includes:
- a first electrode plate arrangeable on the subject product and having a unique shape that defines a first authentication key;
- a first electric field sensor, arrangeable on the main body, for detecting capacitance corresponding to the shape of the first electrode plate to generate a first detection signal;
- and
- a first signal monitor, arrangeable on the main body, for comparing the first detection signal with a first preset signal to generate a first determination signal indicating the comparison result;
- and the second authentication unit includes:
- a second electrode plate arrangeable on the main body and having a unique shape that defines a second authentication key;
- a second electric field sensor, arrangeable on the subject product, for detecting capacitance corresponding to the shape of the second electrode plate to generate a second detection signal;
- and
- a second signal monitor, arrangeable on the subject product, for comparing the second detection signal with a second preset signal to generate a second determination signal indicating the comparison result.
Dependencies are inferred from the claim text.