| 摘要 |
The present invention relates to a fingerprint sensor element, comprising a sensor electrode ( 11 ) formed in an upper conducting layer (M 3 ), a lower electrode ( 17, 32 ) formed in a lower conducting layer (M 2 , P 2 ) and at least one insulating layer ( 8, 9, 10, 22 ) between the upper conducting layer (M 3 ) and the lower conducting layer (M 2 , P 2 ). It further comprises a charge amplifier ( 13 ) having a negative ( 12 ) and a positive ( 14 ) input terminal and an output terminal ( 18 ). An upper side ( 11 a) of the fingerprint sensor electrode ( 11 ) is arranged for facing a finger ( 5 ) and a lower side ( 11 b) is arranged for facing the lower electrode ( 17 ), and the fingerprint sensor electrode ( 11 ) and the lower electrode ( 17 ) are arranged in such a way that a capacitance (C<SUB>ref</SUB>) is formed between them. The sensor electrode ( 11 ) is arranged for being connected to the negative input terminal ( 12 ) of the charge amplifier ( 13 ), and the lower electrode ( 17 ) is arranged for being connected to the output terminal ( 18 ) of the charge amplifier ( 13 ).
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