公开(公告)号：US09672407B2

公开(公告)日：2017-06-06

申请号：US15168591

申请日：2016-05-31

Applicant: Fingerprint Cards AB

Inventor： Karl Lundahl

IPC: G06K9/00 ,  G03F7/16

CPC classification number: G06K9/00053 ,  G03F7/16 ,  G06K9/00 ,  G06K9/0002

Abstract: The invention relates to a fingerprint sensing device comprising: a sensing chip comprising an array of sensing elements being configured to be connected to readout circuitry for detecting a capacitive coupling between each of the sensing elements and a finger placed on a sensing surface of the sensing device. A surface of the sensing elements define a sensing plane. The sensing device further comprises a plurality of interposer structures arranged on the sensing chip extending above sensing plane, wherein the plurality of interposer structures have the same height above the sensing plane. A protective plate is attached to the sensing chip by means of an adhesive, and the protective plate rests on the interposer structures such that a distance between the protective plate and the sensing plane is defined by the height of the interposer structures.