公开(公告)号：JPH11123186A

公开(公告)日：1999-05-11

申请号：JP18724898

申请日：1998-07-02

Applicant: ST MICROELECTRON INC

Inventor： KALNITSKY ALEXANDER ,  KRAMER ALAN

IPC: A61B5/117 ,  G01B7/28 ,  G06K9/00 ,  G06T1/00 ,  G06T7/00

Abstract: PROBLEM TO BE SOLVED: To prevent the contamination of a sensor array by projecting an IC array toward the surface of a package top part so as to cover/protect with a flexible membrane with a low dielectric constant. SOLUTION: An amplifier 13 for inverting a low power signal is provided for all the cells constituting an array to connect a terminal 21, a capacitor 20 and a metallic capacitor plate 24 to the side of its input terminal 6. A metallic capacitor plate 23 is connected to a terminal 17 to be an output terminal. These plates 23 and 24 are covered with a thin dielectric layer 25 of a low dielectric constant to form an active array surface on its upper-side horizontal surface 125 to bring the skin surface 18 of a finger to detect a finger print into physical contact. The layer 25 can cover the whole surface of the upper side part of an IC device surrounding the array and individual cells. The array can be protected by the layer of this constitution.

公开(公告)号：JPH11164824A

公开(公告)日：1999-06-22

申请号：JP25838298

申请日：1998-09-11

Applicant: ST MICROELECTRON INC

Inventor： KALNITSKY ALEXANDER ,  KRAMER ALAN

IPC: G01B7/28 ,  A61B5/117 ,  G06F3/033 ,  G06F3/044 ,  G06K9/00 ,  G06T1/00

Abstract: PROBLEM TO BE SOLVED: To obtain a finger mark detecting device capable of avoiding influence of static electricity charged on the finger tip, by setting a number of metal passages in a dielectric layer and spatially surrounding first and second capacitor plates in the dielectric layer. SOLUTION: An array for finger mark pattern detection comprises an IC device 1 with a sensor array 3 of multi-row/column, and the array 3 has a number of solid state capacitor type sensor cells 2. The individual cell 2 of the sensor array 3 is positioned at the cross point of a row in the horizontal direction and a column in the vertical direction to make the cell possible to address and is sequentially checked by networks 6, 5 in horizontal and vertical directions according to a prescribed self-scanning pattern. Each cell 2 has constitution that two XY flat metal capacitor plates 23, 24 not grounded and metal grids 40 electrically separated from the capacitor plates 23, 24 and electrically grounded are buried in the dielectric layer 25.