JP2006320484A - Pressure sensitive member, pressure sensitive fingerprint sensor using thereof, and fingerprint sensor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure sensitive member which is applicable to an existing capacitance type fingerprint sensor, and prevents breakage of a fingerprint detection part without being affected by a residual fingerprint, and to provide a fingerprint sensor and a fingerprint sensor module which prevent breakage of the fingerprint detection part without being affected by the residual fingerprint. <P>SOLUTION: In the pressure sensitive member, a plurality of detection electrodes are arranged on the substrate of a capacitance type fingerprint sensor arranged in the state of a matrix. The pressure sensitive member is provided with: a flexible film having a pressure sensitive area; a flexible electrode which is formed on one surface side of the flexible film and which opposes the detection electrodes when arranged on the substrate; and a supporting member which separates the detection electrodes from the flexible electrode when arranged on the substrate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure sensitive member, and more particularly to a pressure sensitive member used for a fingerprint sensor. The present invention also relates to a pressure sensitive fingerprint sensor and a fingerprint sensor module using the pressure sensitive member.

Generally, fingerprint recognition technology is used for personal authentication of entrance / exit management of various gates and computer systems. Also, fingerprint sensors that can be reduced in size and thickness are attracting attention as means for identity verification that are mounted on mobile phones, IC cards, and the like.
Generally, a capacitive fingerprint sensor and a pressure sensitive fingerprint sensor are known as fingerprint sensors used for these. The electrostatic capacitance type fingerprint sensor attempts to recognize the fingerprint shape by measuring the electrostatic capacitance between the unevenness of the finger as the detection object and the electrode formed on the detection body. In addition, the pressure-sensitive fingerprint sensor presses a finger, which is an object to be detected, on a detection body provided with a plurality of opposed electrodes, and changes the separation distance between the opposed electrodes corresponding to the unevenness of the finger. It tries to recognize the shape.

As such a capacitive fingerprint sensor, a fingerprint input device 100 described in Patent Document 1 below is known.
In this Patent Document 1, as shown in FIG. 12, an electrode 103 arranged on the surface of a main plane 102 on which a finger 101 is brought into contact with or close to, and the electrode 103 is connected to each of the electrodes 103 and the electrode 103 is statically fixed. A fingerprint input device 100 including a circuit 104 for detecting electric capacity is disclosed.
The fingerprint input device 100 uses the fact that the capacitance of each electrode detected when the finger 101 is brought into contact with or close to the main plane 102 differs according to the unevenness of the fingerprint pattern. A fingerprint image pattern is obtained depending on the size.

Further, as a pressure-sensitive fingerprint sensor as described above, a fingerprint detection device 110 described in Patent Document 2 below is known.
In this Patent Document 2, as shown in FIG. 13, when a finger 112 comes into contact with a plane serving as a contact surface 111, a shape transfer unit 113 whose thickness changes based on pressure generated by the uneven pattern of the fingerprint, A fingerprint detection device 110 having a detection drive circuit unit 114 that detects a change in thickness of the shape transfer unit 113 as a change in capacitance and detects a fingerprint pattern based on the change in capacitance is disclosed.
The shape transfer portion 113 is formed on the deformation layer 115 with an insulating deformation layer 115 whose thickness changes based on the pressure generated by the uneven pattern of the fingerprint, and is deformable based on the pressure generated by the uneven pattern of the fingerprint. The flexible electrode 116 includes a deformable surface protective layer 117 formed on the flexible electrode 116 to protect the flexible electrode 116.
The detection drive circuit unit 114 includes a substrate member 119, a detection electrode 118 formed on the substrate member 119, and a protective layer 120 that protects the detection electrode 118. The detection drive circuit unit 114 has a shape on the detection drive circuit unit 114. A transfer unit 113 is arranged.

In this fingerprint detection apparatus 110, the concave / convex pattern of the fingerprint is a flexible electrode disposed on the detection electrode 118 of the detection drive circuit unit 114 via a deformation layer 115 made of an insulating elastic layer or an insulating fluid layer. 116 is transferred. That is, when a finger is pressed from above the flexible electrode 116, a pressing force acts on the peak portion of the fingerprint, and the flexible electrode 116 is recessed in a direction in which the deformable layer 115 is crushed. On the other hand, the pressing force does not act on the valley of the fingerprint, only the repulsive force from the deformation layer 115 is received, and the flexible electrode 116 swells. In this way, the concave / convex pattern of the fingerprint is transferred to the flexible electrode 116, and the interval between the individual detection electrodes 118 and the flexible electrode 116 arranged in an array changes according to the concave / convex pattern of the fingerprint. . Such a change in the position of the flexible electrode 116 is detected as a change in capacitance, and is output as an electric signal, thereby obtaining an image pattern of fingerprint irregularities.
JP-A-8-305832 Japanese Patent No. 3102395

By the way, in the fingerprint input device described in Patent Document 1, when the surface of the finger is dry, the surface of the finger does not function as an electrode, and there is a possibility that the capacitance corresponding to the unevenness of the fingerprint cannot be detected. was there. Further, when the finger surface is wet, the concave portion of the fingerprint is filled with moisture, and the finger surface becomes a flat electrode, which may make it impossible to detect the capacitance according to the fingerprint unevenness.
Furthermore, when fingerprint detection is performed, a finger, which is the object to be detected, is brought into contact with or close to the surface of the detection electrode, and foreign matter such as sweat or oil adheres to the surface of the detection electrode, forming a so-called residual fingerprint. Resulting in. Therefore, when a new fingerprint is to be detected, these adhering substances are detected, and the remaining fingerprint is detected as a new fingerprint even though the finger to be detected is not placed. There was a risk of malfunction such as

Further, in the fingerprint detection apparatus described in Patent Document 2, it is necessary to change the position of the flexible electrode by pressing and bending the shape transfer portion with a finger when performing fingerprint detection. In this case, it is desirable to reduce the thickness of the shape transfer portion in order to improve the recognition accuracy of fingerprint irregularities, but conversely, this may reduce the strength of the shape transfer portion.
Furthermore, since the shape transfer portion is formed integrally with the detection drive circuit, there is a problem that the entire fingerprint detection device becomes unusable due to the damage of the shape transfer portion.

The present invention has been made in view of the above circumstances, and provides a pressure-sensitive member that can be applied to an existing electrostatic capacitance type fingerprint sensor, is not affected by residual fingerprints, and can prevent damage to a fingerprint detection unit. For the purpose.
It is another object of the present invention to provide a fingerprint sensor and a fingerprint sensor module that can be prevented from being damaged by a fingerprint detection unit without being affected by residual fingerprints.

In order to achieve the above object, the present invention employs the following configuration.
The pressure-sensitive member of the present invention is a pressure-sensitive member disposed on a substrate of a capacitive fingerprint sensor in which a plurality of detection electrodes are disposed in a matrix, and the pressure-sensitive member has a pressure-sensitive region. A flexible film; a flexible electrode formed on one side of the flexible film and opposed to the detection electrode when disposed on the substrate; and the detection when disposed on the substrate. A support member that separates the electrode and the flexible electrode is provided.

  According to this configuration, when a finger is pressed against the flexible film, the flexible electrode formed on one surface of the flexible film is deformed corresponding to the unevenness of the finger. For this reason, when such a pressure-sensitive member is arranged on the substrate of the capacitive fingerprint sensor, the distance between each region of the flexible electrode and the detection electrodes arranged in a matrix changes, and the unevenness of the finger is changed. It is possible to reflect the capacitance of the flexible electrode and the detection electrode.

The pressure-sensitive member of the present invention is characterized in that the pressure-sensitive member is formed so as to be detachable from the capacitive fingerprint sensor.
According to such a configuration, the pressure-sensitive fingerprint sensor can be easily configured simply by attaching the pressure-sensitive member to the capacitance-type sensor, and the capacitance-type fingerprint sensor can be removed by removing the pressure-sensitive member. Can be used. Furthermore, even when the pressure sensitive member is damaged or deteriorated, it can be easily replaced.

  A pressure-sensitive fingerprint sensor according to the present invention includes a capacitive fingerprint sensor including a substrate having a plurality of detection electrodes arranged in a matrix, a flexible film having a pressure-sensitive region, and one surface of the flexible film. A pressure-sensitive member disposed on the substrate with the flexible electrode facing the detection electrode, and the flexible electrode and the detection electrode are separated from each other. And a supporting member to be provided.

  According to this configuration, the pressure sensitive member can be used as a pressure sensitive fingerprint sensor by disposing the pressure sensitive member at a position facing the detection electrode of the capacitive fingerprint sensor. That is, when a finger is pressed against the flexible film, the flexible electrode formed on one surface of the flexible film is deformed corresponding to the unevenness of the finger, so that each of the flexible electrodes Since the separation distance between the region and the detection electrodes arranged in a matrix changes, it is possible to reflect the unevenness of the finger on the capacitance of the flexible electrode and the detection electrode.

The pressure-sensitive fingerprint sensor according to the present invention is characterized in that the pressure-sensitive member is detachably attached to the capacitance-type fingerprint sensor.
According to this configuration, the pressure sensitive member can be used as a pressure sensitive fingerprint sensor by disposing the pressure sensitive member at a position facing the detection electrode of the capacitive fingerprint sensor. Moreover, it can be used as a capacitive fingerprint sensor by removing the pressure sensitive member from the position facing the detection electrode of the capacitive fingerprint sensor. Furthermore, even when the pressure sensitive member is damaged or deteriorated, it can be easily replaced.

The pressure-sensitive fingerprint sensor according to the present invention includes a housing that supports the substrate and a locking member that fixes the pressure-sensitive member to the housing.
According to this configuration, the pressure sensitive member can be fixed to the casing by disposing the pressure sensitive member between the casing and the locking member.

  The fingerprint sensor module of the present invention comprises a substrate on which a plurality of detection electrodes are arranged in a matrix, a strip-like flexible film, and a flexible electrode formed on one side of the flexible film, A belt-like pressure-sensitive member disposed on the substrate with the flexible electrode facing the detection electrode at least on the substrate; and a delivery mechanism for sequentially feeding the belt-like pressure-sensitive member onto the substrate; A support member that separates the flexible electrode and the substrate is provided.

  According to such a configuration, the belt-shaped pressure sensitive member is sequentially delivered onto the detection electrode by driving the delivery mechanism. A fingerprint is attached to the pressure sensitive member on the detection electrode as needed for fingerprint detection. However, since the pressure sensitive member is sequentially sent out, there is no possibility of another fingerprint overlapping on the fingerprint, and the fingerprint overlaps. Occurrence of malfunction due to is prevented. Further, since the pressure-sensitive members are sequentially sent out, the attached fingerprint is immediately collected by the sending mechanism, and there is little possibility that the fingerprint information is copied, and it is possible to prevent the abuse of the fingerprint information. In addition, since the flexible film fed onto the detection electrode is given tension by the support member, it is possible to prevent twisting of the flexible film in the region where the fingerprint is detected.

The fingerprint sensor module of the present invention is provided with a reading prevention mechanism that disables reading of fingerprint information left on the flexible film.
According to this configuration, the fingerprint information left on the used flexible film can be prevented from being read by the reading prevention mechanism, thereby preventing the fingerprint information from being misused.

As described above, according to the pressure-sensitive member of the present invention, it can be applied to an existing electrostatic capacitance type fingerprint sensor, and is not affected by the residual fingerprint, and can prevent the fingerprint detection unit from being damaged.
According to the pressure-sensitive fingerprint sensor of the present invention, the fingerprint detection unit can be prevented from being damaged without being affected by the residual fingerprint. Moreover, it can be properly used as a pressure-sensitive fingerprint sensor or a capacitive fingerprint sensor by attaching and detaching the pressure-sensitive member.
According to the fingerprint sensor module of the present invention, the fingerprint detection unit can be prevented from being damaged without being affected by the residual fingerprint. In addition, it is possible to prevent twisting of the flexible film in the region where the fingerprint is detected. Furthermore, by destroying fingerprint information, misuse of fingerprint information can be prevented.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a pressure-sensitive fingerprint sensor using the pressure-sensitive member of this embodiment. The pressure-sensitive fingerprint sensor 80 includes a capacitive fingerprint sensor 50 having a detection electrode 55 formed on a substrate 51, a flexible film 11, and a flexible film formed on one surface side of the flexible film 11. The pressure sensitive member 10 is composed of a conductive electrode 12, and the support member 13 is arranged so that the flexible electrode 12 of the pressure sensitive member 10 is spaced apart from the detection electrode 55.

FIG. 2 is a perspective view of the pressure-sensitive member 10, and FIG. 3 is a cross-sectional view of the pressure-sensitive member 10.
The pressure-sensitive member 10 includes a flexible film 11 and a flexible electrode 12 formed on one surface thereof. The flexible film 11 is deformed according to the unevenness of the fingerprint, is formed in a substantially square shape with one side of 10 to 20 mm, and the film thickness is set in the range of 3 to 30 μm. A film thickness of less than 3 μm is not preferable because the strength of the flexible film 11 is insufficient. On the other hand, when the film thickness exceeds 30 μm, the deformation of the flexible film does not follow the irregularities of the fingerprint, which makes it difficult to detect the fingerprint. The film thickness is more preferably set to 4 to 10 μm.
As the flexible film 11, an aramid film is preferably used, but any film can be used without particular limitation as long as it is a film made of a resin material that can be formed into a thin film. Examples of such a film material include polyimide, PEN, and PET.

  The flexible electrode 12 serves as an electrode for capacitance detection when the pressure-sensitive member 10 is disposed on the capacitance sensor 50, and has a substantially square shape with a side of 10 to 20 mm. The metal is formed into a thin film so that the film thickness is in the range of 10 nm to 1 μm. The film thickness is more preferably in the range of 100 to 200 nm. As the electrode material, a general metal can be used, and copper, gold, aluminum, chromium, titanium and the like can be suitably used.

On the side of the flexible film 11 where the flexible electrode 12 is formed, a frame 13 having an opening 14 serving as a support member is attached. A region of the flexible film 11 and the flexible electrode 12 corresponding to the opening 14 of the frame 13 is a pressure-sensitive region 15 and is a region where a finger is pressed during fingerprint detection. When the pressure-sensitive region 15 is pressed with a finger during fingerprint detection, the flexible film 11 and the flexible electrode 12 in the pressure-sensitive region 15 are bent and deformed in the thickness direction of the frame 13. That is, in FIG. 3, the flexible film 11 and the flexible electrode 12 are deformed into the opening 14 of the frame 13.
On the opposite side of the frame 13 from the flexible film 12, an adhesive material 16 for detachably attaching the pressure sensitive member 10 to the substrate 51 of the capacitive fingerprint sensor 50 is applied.

FIG. 4 shows a schematic configuration diagram of the capacitance fingerprint sensor 50, and FIG. 5 shows a first usage mode of the pressure-sensitive member of the present embodiment.
In this capacitive fingerprint sensor 50, a row wiring group 52 made up of a plurality of row wirings 52a and a column wiring group 53 made up of a plurality of column wirings 53a are formed on a silicon substrate 51 in a lattice pattern. Are provided with a selection transistor 54 and a detection electrode 55 for generating capacitance. The detection electrode 55 is formed to have an area smaller than the unevenness of the fingerprint. A protective film 59 for protecting the selection transistor 54 and the detection electrode 55 from scratches and dirt is formed on the substrate 51.
The column wiring 53a is a selection line that is connected to the gate of the selection transistor 54 and conducts the selection transistor 54 when it is at a high potential. Scan.
The row wiring 52a is a signal readout line that electrically connects the detection electrode 55 and the capacitance detection circuit 57 on the selected column wiring 53a.

The function of the capacitance detection circuit 57 can be realized, for example, as follows.
First, the row wirings 52a are precharged to a high potential by setting all the column wirings 53a to a low potential. Next, when one of the column wirings 53 a is set to a high potential and the selection transistor 54 is turned on, the potential of the row wiring 52 a is lowered by the electrostatic capacitance of the flexible electrode 12 and the detection electrode 55 of the pressure-sensitive member 10. Since this voltage change amount is determined by the coupling capacitance between the capacitance of the detection electrode 55 and the capacitance of the row wiring 52a, it can be obtained as the capacitance of the detection electrode 55 when amplified by the capacitance detection circuit 57.

Next, the operation of the pressure sensitive fingerprint sensor will be described. As shown in FIG. 5, when detecting the unevenness of the fingerprint, the pressure-sensitive member 10 previously attached to the frame 13 serving as a support member is attached to the substrate 51 of the capacitive fingerprint sensor 50 using an adhesive. deep.
First, all the column wirings 53a are set to a high potential, the selection transistors 54 are turned on, and all the detection electrodes 55 are discharged. Next, by pressing the flexible film 11 with a finger, the flexible film 11 and the flexible electrode 12 are bent toward the substrate 51 and deformed. As a result, the separation distance between the flexible electrode 12 and each of the detection electrodes 55 has changed corresponding to the unevenness of the fingerprint, and the air capacitor 58 is interposed between the flexible electrode 12 and the detection electrode 55. It occurs.

Next, the row wiring 52a is precharged to a high potential, then the first column wiring 53a is set to a high potential, and a voltage drop in the row wiring 52a is detected and amplified by the capacitance detection circuit 57. At this time, if the fingerprint on the detection electrode 55 is a fingerprint, the capacitance C is large and the voltage drop of the row wiring 52a is also large. On the other hand, if the detection electrode 55 is on the fingerprint recess or the outer periphery of the finger, the capacitance C is small and the voltage drop of the row wiring 52a is also small. These results are read out from the capacitance detection circuit 57 and stored in the image memory as an uneven pattern along the first column wiring 52a.
Subsequently, the row wiring 52a is precharged again, the second column wiring 53a is set to a high potential, and the capacitance is detected.
By performing these operations on all the column wirings 53a, a capacitance distribution pattern corresponding to the unevenness of the entire fingerprint surface can be stored in the image memory.

As described above, by attaching the pressure-sensitive member 10 to the substrate 51 of the capacitive fingerprint sensor 50, the capacitive fingerprint sensor can be used as a pressure-sensitive fingerprint sensor.
In addition, the pressure-sensitive member 10 of the present embodiment can be used as a pressure-sensitive fingerprint sensor by being attached to the capacitance-type fingerprint sensor, and the pressure-sensitive type configured in this way. It goes without saying that by removing the pressure-sensitive member 10 from the fingerprint sensor, it can be used as a capacitive fingerprint sensor. That is, the pressure-sensitive member 10 of the present embodiment can be used as a capacitive fingerprint sensor or a pressure-sensitive fingerprint sensor by attaching and detaching the pressure-sensitive member 10.
The attachment / detachment of the pressure sensitive member 10 is not only physically removing from the capacitive fingerprint sensor, but also in a state where the detection electrode 55 of the substrate 51 and the flexible electrode 12 of the pressure sensitive member 10 do not face each other. It also means arranging.

Next, another usage mode of the pressure-sensitive member 10 will be described with reference to FIGS. 6 and 7.
The casing 20 has a substantially rectangular parallelepiped shape, and a concave portion 21 having a substantially square shape in plan view is formed at the center of the upper portion. Two engagement holes 22 are formed on the top surface of the housing 20 and outside one side of the recess 21, and a locking member 30 is connected to the housing 20 by a hinge 32 on the outside of the opposite side. It is connected. The locking member 30 is formed in a flat plate shape, and a substantially square opening 33 is formed at the center. One end of the locking member 30 is rotatably connected to the housing 20 by a hinge 32, and two hooks 31 that engage with the engagement holes 22 of the housing 20 are formed at the other end. A substrate 51 of a capacitive fingerprint sensor 50 is disposed in the recess 21 of the housing 20, and the pressure-sensitive member 10 described above is placed on the substrate 51. After placing the pressure-sensitive member 10 on the substrate 51, the pressure-sensitive member 10 is fixed to the housing 20 by engaging the hook 31 of the locking member 30 with the engagement hole 22 of the housing 20. A fingerprint sensor 81 is configured.

In this state, when the finger is pressed against the pressure-sensitive member 10 from the locking member 30 side, the flexible film 11 and the flexible electrode 12 are deformed toward the substrate 51 side. At that time, the pressing region 15 of the pressure-sensitive member 10 corresponding to the convex portion of the finger is greatly bent, and the pressing region 15 of the pressure-sensitive member 10 corresponding to the concave portion of the finger is not bent. Here, as described above, by driving the column wiring drive unit 56 and the capacitance detection circuit 57, the unevenness of the finger can be detected as a change in capacitance.
In addition, after releasing the hook 31 and rotating the locking member 30 with the hinge 32, the pressure sensitive member 10 can be removed from the substrate 21 to be used as a capacitive fingerprint sensor.

Next, another usage mode of the pressure-sensitive member 10 will be described with reference to FIG.
In this usage mode, the casing 20 and the locking member 30 are configured in the same manner as in the above usage mode, but the point that the pressure-sensitive member 10 is attached to the locking member 30 is the above-described usage mode. Different from embodiment. That is, as shown in FIG. 8, the pressure-sensitive member 10 including the flexible film 11 and the flexible electrode 12 and the support member 13 are attached to the lower surface of the locking member 30. By engaging the hook 31 of the locking member 30 with the engagement hole 22 of the housing 20, the pressure-sensitive member 10 is disposed on the substrate 51 and fixed to the housing 20, and the pressure-sensitive fingerprint sensor 82 is configured. Is done.

In this state, when the finger is pressed against the pressure-sensitive member 10 from the locking member 30 side, the flexible film 11 and the flexible electrode 12 are deformed toward the substrate 51 side. At that time, the pressing region 15 of the pressure-sensitive member 10 corresponding to the convex portion of the finger is greatly bent, and the pressing region 15 of the pressure-sensitive member 10 corresponding to the concave portion of the finger is not bent. Here, as described above, by driving the column wiring drive unit 56 and the capacitance detection circuit 57, the unevenness of the finger can be detected as a change in capacitance.
In addition, by releasing the hook 31 and rotating the locking member 30 with the hinge 32, the pressure-sensitive member 10 is detached from the substrate 51 and can also be used as a capacitive sensor. .

[Second Embodiment]
Next, a second embodiment of the present invention will be described using FIG. 9 and FIG.
This pressure-sensitive member 40 is comprised from the flexible film 11 and the flexible electrode 12 formed in the one surface side like the pressure-sensitive member 10 of 1st Embodiment. The second pressure-sensitive member 40 is formed in a band shape, and is wound in a roll shape before use. The support member composed of the pair of support bodies 41 and 42 is for supporting and winding up the pressure sensitive member 40. The support bodies 41 and 42 are formed in a substantially rectangular parallelepiped shape having an opening 46 on one surface, and a reel mechanism having a rotation function (not shown) is provided. Two hooks 43 are formed below the support bodies 41 and 42, and the support bodies 41 and 42 are attached to the housing 22 by the hooks 43. The pressure-sensitive member 40 wound in a roll shape is rotatably attached to the shaft portion 44 of the reel mechanism of the first support body 41, and one end thereof is attached to the shaft portion 45 of the reel mechanism of the second support body 42. It is mounted for rotation.

  A recess 21 is formed at the center of the upper portion of the housing 20, and the substrate 51 of the capacitance fingerprint sensor 50 is disposed in the recess 21. A first engagement hole 47 and a second engagement hole 48 including two holes are provided on the upper surface of the housing 22 so as to sandwich the recess 21. In addition, two fixing holes 49 are provided outside the first engagement hole 47. By engaging the hook 43 of the first support body 41 with the fixing hole 49 of the housing 22 and engaging the hook 43 of the second support body 42 with the second engagement hole 48, the pressure-sensitive member 40 is mounted on the housing. The pressure sensitive fingerprint sensor 83 is configured so as to face the substrate 51 disposed in the concave portion 21.

In this state, when the pressure-sensitive member 40 is pressed to the substrate 51 side with a finger, the flexible film 11 and the flexible electrode 12 are deformed to the substrate 51 side. At this time, the pressure-sensitive region 15 of the pressure-sensitive member 40 corresponding to the convex portion of the finger is greatly bent, and the pressure-sensitive region 15 of the pressure-sensitive member 40 corresponding to the concave portion of the finger is not bent. Here, as described above, by driving the column wiring drive unit 56 and the capacitance detection circuit 57, the unevenness of the finger can be detected as a change in capacitance.
After detecting the fingerprint, the reel mechanism (not shown) winds up the area where the fingerprint is attached and moves the area where the fingerprint is not attached to a position facing the substrate 51 to detect the fingerprint again. It can be carried out. At this time, since the area where the fingerprint of the pressure-sensitive member 40 is attached is wound around the second support 42, there is no possibility that the fingerprint is read from the outside.
The pressure-sensitive member 40 can be removed from the position facing the substrate 51 by removing the hook 43 of the second support 42 from the second engagement hole 48 and attaching it to the first engagement hole 47, and electrostatically It can also be used as a capacitive fingerprint sensor.

[Third embodiment]
Next, a fingerprint sensor module according to a third embodiment of the present invention will be described with reference to FIG.
The fingerprint sensor module 60 of the present embodiment includes a support base 63 serving as a support member on which the substrate 51 of the capacitive fingerprint sensor 50 is placed and a protrusion 62 that supports the pressure-sensitive member 61 is formed. A feeding mechanism 66 composed of a pair of reels 64 and 65 arranged so as to sandwich the support base 63 for sequentially feeding the pressure-sensitive member 61 onto the substrate 51, and a reading which makes the used pressure-sensitive member 61 unreadable. Disabling means 67 is provided.

  The pair of reels 64 and 65 are rotatably attached to the housing 70 by bearings 68 and 69 of a rotation mechanism (not shown). A pair of reels 64 and 65 is wound with a band-shaped pressure-sensitive member 61 including a strip-shaped flexible film 11 and a flexible electrode 12 formed on one surface thereof. As the 65 rotates, the pressure sensitive member 61 is sent out from the first reel 64 to the second reel 65. The pressure-sensitive member 61 disposed facing the substrate 51 is tensioned on the side opposite to the substrate 51 side by a pair of protrusions 62 and a pair of reels 64 and 65 formed at the end of the support base 63. Is given. A reading prevention mechanism including a punching mechanism 67 is provided between the support base 63 and the second reel 65, and a hole is made in a part of the used pressure-sensitive member 61 to adhere to the pressure-sensitive member 61. Make fingerprint information unreadable.

When the fingerprint sensor module 60 is used, the fingerprint sensor module 60 is configured as described above, and the pressure sensitive member 61 is pressed on the flexible electrode 12 and the substrate 51 by pressing the pressure sensitive member 61 with a finger. The separation distance from the detected electrode 55 is changed according to the unevenness of the finger. Next, as described above, by driving the column wiring drive unit 56 and the capacitance detection circuit 57, the unevenness of the finger can be detected as a change in capacitance.
In addition, after the fingerprint detection, the pair of reels 64 and 65 are rotated, and the area where the fingerprint of the pressure-sensitive member 61 is not attached is sent to a position facing the substrate 51, thereby enabling the next fingerprint detection. Along with the movement of the pressure-sensitive member 61, the area of the pressure-sensitive member 61 to which the fingerprint is attached is wound around the second reel 65 so that it cannot be read from the outside. In addition, before winding on the 2nd reel 65, by making a hole in the area | region where the fingerprint of the pressure sensitive member 61 adhered by the punching mechanism 70, fingerprint information can be made into a state which cannot read more reliably.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the reading prevention mechanism only needs to make the fingerprint information attached to the pressure-sensitive member unreadable, and may destroy the fingerprint information with chemicals or the like.

It is sectional drawing which shows the fingerprint sensor of 1st Embodiment of this invention. It is a perspective view which shows the pressure sensitive member of 1st Embodiment of this invention. It is A-A 'sectional drawing of FIG. 1 is a schematic configuration diagram of an active matrix sensor of the present invention. It is the schematic explaining operation | movement of the pressure-sensitive fingerprint sensor of 1st Embodiment of this invention. It is a perspective view which shows the other usage condition of the pressure sensitive member of 1st Embodiment of this invention. It is sectional drawing which shows the other usage condition of the pressure sensitive member of 1st Embodiment of this invention. It is sectional drawing which shows the other usage condition of the pressure sensitive member of 1st Embodiment of this invention. It is a perspective view which shows the pressure sensitive member of 2nd Embodiment of this invention. It is sectional drawing which shows the usage condition of the pressure-sensitive member of 2nd Embodiment of this invention. It is sectional drawing which shows the fingerprint sensor module of 3rd Embodiment of this invention. It is the schematic which shows the conventional electrostatic capacitance type fingerprint sensor. It is the schematic which shows the conventional pressurization type fingerprint sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pressure-sensitive member, 11 ... Flexible film, 12 ... Flexible electrode, 13 ... Frame (support member), 15 ... Pressure-sensitive area, 20 ... Housing Body, 41, 42 ... support (support member), 50 ... capacitive fingerprint sensor, 51 ... substrate, 55 ... detection electrode, 60 ... fingerprint sensor module, 63 ... Support base (support member), 64, 65 ... reel, 67 ... punching mechanism, 80, 81, 82, 83 ... pressure sensitive fingerprint sensor

Claims (7)

A pressure-sensitive member arranged on a substrate of a capacitive fingerprint sensor in which a plurality of detection electrodes are arranged in a matrix;
The pressure-sensitive member having a pressure-sensitive region; a flexible electrode formed on one surface of the flexible film and facing the detection electrode when disposed on the substrate; A pressure-sensitive member, comprising: a support member that separates the detection electrode and the flexible electrode when disposed on the substrate.   The pressure-sensitive member according to claim 1, wherein the pressure-sensitive member is detachably formed on the capacitive fingerprint sensor. A capacitive fingerprint sensor including a substrate having a plurality of detection electrodes arranged in a matrix;
A flexible film having a pressure-sensitive region and a flexible electrode formed on one side of the flexible film are disposed on the substrate with the flexible electrode facing the detection electrode. A pressure sensitive member;
A pressure sensitive fingerprint sensor, comprising: a support member that separates the flexible electrode and the detection electrode.   The pressure-sensitive fingerprint sensor according to claim 3, wherein the pressure-sensitive member is detachably attached to the capacitive fingerprint sensor.   The pressure-sensitive fingerprint sensor according to claim 3 or 4, further comprising a housing that supports the substrate and a locking member that fixes the pressure-sensitive member to the housing. A substrate in which a plurality of detection electrodes are arranged in a matrix;
It consists of a strip-shaped flexible film and a flexible electrode formed on one surface side of the flexible film, and is disposed on the substrate at least on the substrate with the flexible electrode facing the detection electrode A band-shaped pressure sensitive member,
A delivery mechanism for sequentially delivering the belt-like pressure-sensitive member onto the substrate;
A fingerprint sensor module, comprising: a support member that separates the flexible electrode and the substrate. The fingerprint sensor module according to claim 6, further comprising a reading prevention mechanism that disables reading of fingerprint information left on the flexible film.

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