JP2017219990A - Cover opening/closing detection device and automatic transaction device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect opening of a cover provided on both sides of a multilayer substrate at two contact points.SOLUTION: A cover opening/closing detection device comprises a first contact point 11a formed on the surface of a multilayer substrate 10 and a second contact point 22a which changes the state of being in contact with the first contact point according to opening/closing of the cover. The first contact point is formed on both surfaces of the multilayer substrate, the cover and the second contact point are provided on both sides of the multilayer substrate and the second contact point on one surface side of the multilayer substrate is connected to the second contact point on the other surface side of the multilayer substrate.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cover open / close detection device and an automatic transaction device using the same, and for example, relates to an input device such as a numeric keyboard or PINPAD (Personal Identification Number PAD) for inputting a personal identification number.

  Conventionally, this type of input device has a keyboard disposed on the upper surface of the case, a printed circuit board on which a microcomputer for converting a key operation such as a password is converted into an electrical signal, and a protection detection net that covers the printed circuit board. I have. The protection detection net is for detecting a destructive action from the outside. When the microcomputer detects the destructive action, the microcomputer discards sensitive information such as a personal identification number and an encryption key.

  Patent Document 1 discloses a technique for providing a switch for detecting a cover peeling action. In this technique, when the cover is closed, the two electrodes arranged on the printed circuit board are electrically connected by the conductive rubber, and the switch is opened when the cover is peeled off. It is configured as follows.

US Patent Application Publication No. 2014/0351959

  However, in the technique of Patent Document 1, a switch is provided only on the upper cover. For this reason, although the technique of patent document 1 can detect the peeling action of an upper cover, it cannot detect even the peeling action of a lower cover. In other words, the technique of Patent Document 1 detects the state of the switch and the switch (two contacts) on both sides of the printed circuit board (multilayer board) if it tries to detect the peeling action of both the upper cover and the lower cover. It is necessary to provide a detection circuit that performs this. That is, the detection circuit needs to detect the states of at least three contact points.

  It is an object of the present invention to provide a cover open / close detection device capable of detecting the opening of covers disposed on both sides of a multilayer board with two contact points, and an automatic transaction device using the same.

  In order to solve the above-described problem, the cover open / close detection device of the present invention has a contact state between the first contact formed on the surface of the multilayer substrate (10) and the first contact (11a) as the cover is opened and closed. A cover open / close detection device having a second contact (22a, 22b) that changes, wherein the first contact is formed on both surfaces of the multilayer substrate, and the cover and the second contact are It is arranged on both sides of the multilayer substrate, and the second contact on one surface side of the multilayer substrate and the second contact on the other surface side of the multilayer substrate are connected to each other. In addition, the code | symbol in () is an illustration.

  As the cover is opened and closed, the contact state between the two second contacts connected to each other and the first contact formed on both sides of the multilayer substrate changes, so the electrical contact state of the first contact formed on both sides changes. If detected, it is possible to detect the opening / closing of one or both covers disposed on both sides of the multilayer substrate.

  According to the present invention, it is possible to detect the opening of the covers disposed on both sides of the multilayer board with two contact points.

It is a longitudinal cross-sectional view of the cover opening / closing detection apparatus which is 1st Embodiment of this invention. It is an enlarged view of the elastic member periphery of the state which attached the cover. It is an enlarged view of the elastic member periphery of the state which removed the cover. It is a circuit diagram of a cover open / close detection device. It is a longitudinal cross-sectional view of the cover opening / closing detection apparatus which is 2nd Embodiment of this invention. It is a structural diagram of a metal dome. It is a figure of the press part periphery of the state which attached the cover. FIG. 6 is an enlarged view of the vicinity of a pressing portion with a cover attached. It is a figure of the press part periphery of the state which removed the cover. FIG. 6 is an enlarged view of the vicinity of a pressing unit with a cover removed. It is a longitudinal cross-sectional view of the cover opening / closing detection apparatus which is 3rd Embodiment of this invention. It is an external view of an automatic transaction apparatus provided with the cover opening / closing detection apparatus of this invention. It is a longitudinal cross-sectional view of the cover opening / closing detection apparatus which is a comparative example of this invention. It is a figure of the switch part periphery of the state which attached the cover. It is a figure for demonstrating the subject in the state which removed the cover.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. Each figure is only schematically shown so that the present invention can be fully understood. Therefore, the present invention is not limited to the illustrated example. Moreover, in each figure, the same code | symbol is attached | subjected about the common component and the same component, and those overlapping description is abbreviate | omitted.

(First embodiment)
The cover opening / closing detection device 100 of this embodiment is assumed to be used for an input device such as a PIN code input keyboard or PINPAD used in an automatic transaction device 200 (FIG. 12) such as ATM (Automated Teller Machine). Yes.

(Description of configuration)
FIG. 1 is a longitudinal sectional view of a cover open / close detection device according to a first embodiment of the present invention.
The cover open / close detection device 100 includes a PCB (Printed Circuit Board) 10, an FPC (Flexible Printed Circuits) 20, an upper cover 30, a lower cover 40, two elastic members 50 and 50 as two pressing members, Holding members 55 and 55 are provided, and the internal circuit of the PCB 10 is configured to detect the opening of one of the upper cover 30 and the lower cover 40.

  The PCB 10 is a printed circuit board in which a plurality of key switches and electronic circuits for inputting a password are mounted on a rigid board (multilayer board, double-sided board). The FPC 20 is a flexible printed wiring board in which a wiring conductor layer is covered with a resin (for example, a polyimide film). In the present embodiment, the FPC 20 covers the PCB 10 so as to be sandwiched from both sides, and is formed in a substantially U shape. That is, the FPC 20 is in contact with both sides of the PCB 10. Further, the tamper detection grid lines connected in series are stretched at a high density in the FPC 20, and are configured to detect a destructive action and an intruding action from the outside by disconnection.

  The upper cover 30 and the lower cover 40 cover the PCB 10 and the FPC 20 so that they can be opened and closed from both sides, and function as a casing. The lower cover 40 has a substantially U-shaped (substantially U-shaped) box shape in cross-sectional view, and is provided with support surfaces 40a and 40a that support the PCB 10 and the FPC 20, and at least one of the support surfaces 40a is It is supported by a support member (not shown). The elastic members 50 and 50 are cylindrical rubbers disposed on the inner surfaces of the upper cover 30 and the lower cover 40. Here, the elastic member 50 which is not supported by the support member holds the PCB 10 and the FPC 20 against the support surface 40a. The holding members 55 and 55 are cylindrical members that fix the elastic member 50 to the inner surfaces of the upper cover 30 and the lower cover 40.

  FIG. 2 is an enlarged view around the elastic member with the cover attached, and FIG. 3 is an enlarged view around the elastic member with the cover removed. Here, the cover means one or both of the upper cover 30 and the lower cover 40, and the internal substrate (PCB 10 or FPC 20) is exposed when either one is opened.

  The PCB 10 is a double-sided board (multilayer board) in which metal layers 11 and 13 as wiring layers are pasted on both sides of an insulating layer 12 such as glass epoxy, and is also called a rigid board (hard board). The FPC 20 is a single-layer flexible substrate in which resin layers 21 and 23 are applied on both surfaces of a metal layer 22 as a wiring layer.

  In the FPC 20, the resin layer 23 forms an opening (FIG. 3) in the vicinity of the nipping portion sandwiched between the PCB 10 and the elastic member 50, the surface of the metal layer 22 is exposed, and the FPC 20 serves as a second contact. A contact 22a is formed. Further, the metal layer 11 of the PCB 10 is exposed to the contact 11a as the first contact facing the contact 22a.

  In a state where the cover is attached (FIG. 2), the elastic member 50 presses the PCB 10 and the FPC 20, and the contact point 11a and the contact point 22a are in a pressure contact state. On the other hand, in a state where the cover is removed (FIG. 3), the elastic member 50 does not press the PCB 10 and the FPC 20. Therefore, although the PCB 10 and the FPC 20 are in contact with each other, the opening 23b is formed due to the thickness of the resin layer 23, and the contact 11a and the contact 22a are in a non-contact state (non-pressure contact state).

FIG. 4 is a circuit diagram of the cover open / close detection device.
The cover open / close detection device 100 includes two switches 71 and 72 connected in series, a key switch 73, a detection circuit 70, and a control unit 75, and the detection circuit 70 is one or both of the switches 71 and 72. Is configured to detect the opening of the. The key switch 73 is a so-called 10 key, and is used to input a password.

  The switch 71 represents contact / non-contact (conduction / non-conduction) between the contact 22a (second contact) of the FPC 20 disposed on the upper cover 30 side and the contact 11a (first contact) of the PCB 10. . The switch 72 represents contact / non-contact (conduction / non-conduction) between the contact 22a (second contact) of the FPC 20 disposed on the lower cover 40 side and the contact 11a (first contact) of the PCB 10. . The contact 22a disposed on the upper cover 30 side and the contact 22a disposed on the lower cover 40 side are connected using the metal layer 22 of the FPC 20. That is, the FPC 20 functions as a bridge element that bridges the two contact points 11a and 11a.

  The detection circuit 70 detects a contact state (short circuit / open) between the contact points 11a and 22a of the switches 71 and 72, and is configured by an appropriately pulled up I / O port. The metal layer 11 of the PCB 10 is wired between the contact point 11a of the switch 71 and the detection circuit 70 and between the contact point 11a of the switch 72 and the detection circuit 70.

  The control unit 75 is a CPU (Central Processing Unit) that encrypts the signal of the key switch 73 for inputting the password. The control unit 75 discards sensitive information such as a personal identification number and key information when the detection circuit 70 detects the opening of one or both of the two switches 71 and 72.

  As described above, in the cover open / close detection device 100 according to the present embodiment, the contact 11a of the PCB 10 and the contact 22a of the FPC 20 are separated from each other when the cover 30 is opened or broken. 4) can detect the open state of the switch 71. On the other hand, in the cover open / close detection device 100, when the cover 40 is broken and the elastic member 50 and the PCB 10 are separated from each other, the detection circuit 70 (FIG. 4) can detect the open state of the switch 72.

(Second Embodiment)
In the cover open / close detection device 100 of the first embodiment, the PCB 10 and the FPC 20 are in contact with each other in the vicinity of the elastic member 50, but a metal dome can be inserted.

FIG. 5 is a longitudinal sectional view of a cover open / close detection device according to the second embodiment of the present invention.
The cover open / close detection device 101 includes a PCB 10, an FPC 20, an upper cover 30, a lower cover 40, two metal domes 60 and 60, and two pressing portions 65 and 65 as pressing members. Is inserted in the vicinity of the pressing portion 65 and between the PCB 10 and the FPC 20.

6A and 6B are structural views of the metal dome. FIG. 6A is a longitudinal sectional view, and FIG. 6B is a plan view.
The metal dome 60 is formed by forming a metal plate in a circular shape in a plan view and in an arc shape in a cross-sectional view. The metal dome 60 is an elastic member that is deformed into a substantially M shape in a cross-sectional view when the top (center) is pressed (see FIGS. 7 and 8), and returns from the deformed state when the pressing is stopped. Here, as shown in FIG. 6 (b), the metal dome 60 includes a non-conductive portion 60b in which a thin film sheet (for example, polyethylene terephthalate) 60c is attached to the central portion, and an annular conductive portion 60a in which the surrounding metal is plated. And form. The pressing unit 65 is a rigid body having a convex shape in a cross-sectional view and a circular shape in a plan view.

FIG. 7 is a view around the pressing portion with the cover attached, and FIG. 8 is an enlarged view around the pressing portion with the cover attached.
In the resin layer 21, an annular opening 23 b (FIG. 8) is formed in the vicinity of the pressing portion 65. That is, the resin layer 21 is formed with a circular portion 23a (FIG. 8) facing the pressing portion 65, and an opening 23b is formed around the circular portion 23a. Further, the metal dome 60 has a circular outer peripheral end fitted into the metal layer 11 of the PCB 10 and is in electrical contact.

  In the state where the cover is attached, the pressing portion 65 pushes down the FPC 20 and deforms the metal dome 60 into a substantially M shape in a cross-sectional view. That is, the pressing part 65 functions as a pressing member. Thereby, the metal dome 60 has an annular crest 60c. Thereby, the peak part 60c and the annular contact 22b (second contact) of the FPC 20 are in electrical contact. That is, as shown in FIG. 6B, the metal dome 60 is divided into an annular conductive portion 60a and a central non-conductive portion 60b. Here, since the circular outer peripheral end of the metal dome 60 is in electrical contact with the metal layer 11 of the PCB 10, the annular crest 60 c (conduction portion 60 a) functions as a first contact.

FIG. 9 is a view around the pressing portion with the cover removed, and FIG. 10 is an enlarged view around the pressing portion with the cover removed.
When the cover is removed, the pressing unit 65 and the FPC 20 are separated from each other. Then, the metal dome 60 returns to the arc state when viewed in cross section.

  The top of the metal dome 60 contacts the circular portion 23a of the resin layer 23 of the FPC 20 and does not contact the contact 22a of the metal layer 22 even when the thin film sheet 60c is not attached. That is, the metal layer 11 of the PCB 10 and the metal layer 22 of the FPC 20 are in a non-conductive state. In addition, if the thin film sheet is affixed to the center part, the metal dome 60 will not electrically contact the contact 22a even if the circular part 23a is not formed in the FPC 20.

  In the cover open / close detection device 101 of the present embodiment, the metal dome 60 is inserted, so that the pressure by the spring of the metal dome 60 is applied, and the electrical contact is further strengthened. For this reason, the cover open / close detection device 101 has a quality improvement effect of suppressing erroneous detection.

(Third embodiment)
In the first embodiment, the elastic member 50 sandwiches the PCB 10 and the FPC 20 between the upper cover 30 and the lower cover 40, and in the second embodiment, the holding member 55 sandwiches the elastic member 50. A hybrid structure using both the member 50 and the holding member 55 can be obtained.

FIG. 11 is a longitudinal sectional view of a cover open / close detection device according to a third embodiment of the present invention.
The cover open / close detection device 102 includes a PCB 10, an FPC 20, an upper cover 30, a lower cover 40, an elastic member 50, a holding member 55, a metal dome 60, and a pressing unit 65. The cover open / close detection device 102 includes a metal dome 60 and a pressing portion 65 on the upper cover 30 side, and includes an elastic member 50 and a holding member 55 on the lower cover 40 side on which the support surface 40a is formed.

(Automatic transaction equipment)
FIG. 12 is an external view of an automatic transaction apparatus including the cover opening / closing detection apparatus of the present invention.
The automatic transaction apparatus 200 is an ATM installed in a financial institution, a distribution institution, or the like. The banknote deposit / withdrawal unit 80, a customer operation display unit 81, a card unit 82, a receipt unit 83, and a cover opening / closing as a numeric keypad unit. A detection device 100, a bill insertion slot 87, and a control device 86 are provided, and each part is stored inside the main body housing 90.

  The banknote deposit / withdrawal unit 80 is a cassette-type mechanism unit that discriminates banknotes (paper sheets) as media inserted into the banknote slot 87, counts for each denomination, and stores banknotes in denominations. The banknote deposit / withdrawal unit 80 is configured to be able to take out a banknote storage for storing a plurality of denomination cassettes in the front-rear direction during maintenance.

  The cover open / close detection device 100 as a numeric keypad (input device) is disposed, for example, above the banknote deposit / withdrawal unit 80, and the automatic transaction device 200 removes the cover open / close detection device 100 from the inside during maintenance. be able to.

  The control device 86 is a device that controls each part and executes a transaction. In particular, the control device 86 is connected to the cover open / close detection device 100 by USB (Universal Serial Bus) and can be inserted and removed during maintenance. In addition, the control device 86 receives a password encrypted with the encryption key from the numeric keypad (cover opening / closing detection device 100).

(Operation)
Even during maintenance, the automatic transaction apparatus 200 removes the numeric keypad (cover open / close detection device 100) and opens the upper cover 30 or the lower cover 40 of the cover open / close detection device 100 to provide sensitive information (such as a secret number or encryption). Key) is automatically deleted. For this reason, a malicious worker can peel off the upper cover 30 or the lower cover 40 and, for example, can make a modification on the numeric keypad so as to obtain the password of the user (customer). However, even if such a cover removing action is performed, the encryption key is erased from the numeric keypad (cover open / close detection device 100), and information transmission with the control device 86 becomes impossible.

  Further, the FPC 20 covering both sides of the PCB 10 has a high density tamper detection grid line. Therefore, even when the detection circuit 70 can perform the act of peeling off the upper cover 30 or the lower cover 40 without detecting the opening of the switches 71 and 72 (FIG. 4), the tamper detection grid line is A physical attack on the PCB 10 can be detected.

  Further, by making the tamper detection grid line and the wiring of the metal layer 22 connecting the switches 71 and 72 common, the detection circuit 70 detects the opening of the switches 71 and 72 and supplies the PCB 10 to the PCB 10 by the tamper detection grid line. Both physical attack detection can be performed.

(Comparative example)
FIG. 13 is a longitudinal sectional view of a cover open / close detection device that is a comparative example of the present invention, and FIG. 14 is a view of the periphery of the switch portion with the cover attached.
The cover open / close detection device 103 includes a PCB 10, an upper cover 30, a lower cover 40, a conductive rubber 56, and a holding member 55. The cover open / close detection device 103 includes a conductive rubber 56 and a holding member 55 on the upper cover 30 side, and the PCB 10 has two contacts 15 and 15 formed on the metal layer on the surface. The contacts 15, 15 are formed in a rectangular shape, and are arranged in parallel and spaced apart from each other. The cover open / close detection device 103 is provided with a support surface 40a on the lower cover 40 side, and is not provided with the conductive rubber 56 and the contacts 15 and 15.

(Operation)
In the cover open / close detection device 103, the conductive rubber 56 short-circuits the two contacts 15, 15 in a state where the upper cover 30 is attached. Then, the detection circuit 70 (FIG. 4) detects the conduction state of the two contacts 15 and 15. On the other hand, in the state where the upper cover 30 is removed, in the cover open / close detection device 103, the holding member 55 holds the conductive rubber 56, the two contacts 15, 15 and the conductive rubber 56 are separated, and the two contacts 15. 15 are insulated.

FIG. 15 is a diagram for explaining the problem with the cover removed.
In the cover open / close detection device 103, when the upper cover 30 is removed after a long period of time, the conductive rubber 56 may come off the holding member 55 and be adsorbed (fused) on the surface of the PCB 10 like a suction cup. That is, the cover open / close detection device 103 is in a state where the two contacts 15 and 15 remain conductive even when the upper cover 30 is removed.

  However, since the cover open / close detection devices 100, 101, and 102 of each of the embodiments do not use the conductive rubber 56, the conductive rubber 56 is not adsorbed (fused) to the surface of the PCB 10. Further, in the cover open / close detection devices 101 and 102 of the second and third embodiments, when the pressure from the cover disappears, the central portion of the metal dome 60 rises with the force of the spring, and the force is positively detected in the tampering direction. Work. For this reason, the cover open / close detection devices 101 and 102 have higher security than the cover open / close detection device 103.

  Further, since the cover open / close detection device 103 of this comparative example is provided with the conductive rubber 56 and the contacts 15 and 15 only on the upper cover 30 side, even if it can detect the peeling action of the upper cover 30. The act of peeling off the lower cover 40 cannot be detected. In order to detect both the upper cover 30 and the lower cover 40, two detection circuits are required.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications such as the following are possible.
(1) As shown in FIG. 3, the cover open / close detection device 100 of the first embodiment insulates the contact 11a of the PCB 10 and the contact 22a of the FPC 20 with the thickness of the resin layer 23 when the cover is opened. . Even if the contact point 11a and the contact point 22a are in contact with each other without considering the thickness of the resin layer 23, the detection circuit 70 (FIG. 4) detects the contact resistance and determines the magnitude of the electrical resistance. It doesn't matter if it exists.

  That is, the detection circuit 70a (not shown) detects a high contact resistance when the cover is open, and detects a low contact resistance when the cover is closed. In other words, the detection circuit 70a detects the contact state between the contact 11a and the contact 22a.

(2) In each of the above embodiments, the detection circuit 70 for detecting the electrical contact state of the contacts 11a and 11a on both sides of the PCB 10 is provided and the two contacts 22a and 22a of the FPC 20 are connected to each other. The contact points 11a and 11a may be connected to each other, and the electrical contact state of the two contact points 22a and 22a of the FPC 20 may be detected.

(3) In each of the above embodiments, a pair of contacts 11a and 22b are provided on the upper cover 30 side and the lower cover 40 side, respectively, but on either or both of the upper cover 30 side and the lower cover 40 side. One or more sets of contacts 11a, 22b,... May be added. Even at this time, the plurality of contacts 11a, 11a, 11a,... Of the PCB 10 may be connected in series, and the plurality of contacts 22a, 22a,.

(4) The lower cover 40 of each of the above embodiments has a substantially U-shaped (substantially U-shaped) box shape in cross-sectional view, and the upper cover 30 is a plate-like cover. The lower cover 40 may be configured by a main body portion that is a rectangular wall surface in plan view having the support surface 40a and a plate-like cover that covers the main body portion. At this time, the detection circuit 70 (FIG. 4) detects the open / closed state of the plate-like cover constituting the lower cover 40.

10 PCB (Multilayer board, Double-sided board, Rigid board, Hard board)
11, 13, 22 Metal layer 11a Contact (first contact)
12 Insulation layer (glass epoxy layer)
15 contacts 20 FPC (flexible substrate)
21, 23 Resin layer 22a, 22b Contact (second contact)
23a Circular part 23b Opening part 30 Upper cover 40 Lower cover 40a Support surface 50 Elastic member (pressing member)
55 Holding member 56 Conductive rubber 60 Metal dome (conductive elastic member)
60a conduction part 60b non-conduction part 60c thin film sheet 65 pressing part (pressing member)
70 Detection circuit (I / O port)
71, 72 switch 73 key switch 75 control unit 80 bill deposit / withdrawal unit 81 customer operation display unit 82 card unit 83 receipt unit 86 control unit 87 bill insertion slot 90 main body casing 100, 101, 102, 103 cover open / close detection device (input) apparatus)
200 Automatic transaction equipment

Claims (11)

A cover open / close detection device comprising: a first contact formed on a surface of a multilayer substrate; and a second contact whose contact state changes with the opening and closing of the cover,
The first contact is formed on both surfaces of the multilayer substrate;
The cover and the second contact are disposed on both sides of the multilayer substrate,
A cover open / close detection apparatus, wherein a second contact on one surface side of the multilayer substrate and a second contact on the other surface side of the multilayer substrate are connected to each other. The cover open / close detection device according to claim 1,
The cover open / close detection device, wherein the second contact on one surface side of the multilayer substrate and the second contact on the other surface side of the multilayer substrate are connected by a flexible substrate. The cover open / close detection device according to claim 2,
The cover open / close detection device, wherein the flexible substrate is in contact with both surfaces of the multilayer substrate, and is stretched by wiring between the second contacts. The cover open / close detection device according to claim 2 or 3,
The flexible substrate is covered with an insulating resin around the second contact,
The first contact and the second contact become conductive when the cover is closed, and become non-conductive when the cover is opened,
A detection circuit for detecting whether a first contact formed on one surface of the multilayer substrate and a first contact formed on the other surface of the multilayer substrate are in a conductive state or a non-conductive state; A cover open / close detection device comprising: The cover opening / closing detection device according to any one of claims 2 to 4,
The cover open / close detection device further comprising a conductive elastic member inserted between the first contact and the second contact. The cover opening / closing detection device according to any one of claims 2 to 4,
The cover open / close detection device according to claim 1, wherein the first contact is a conductive elastic member in contact with a metal layer of the multilayer substrate. The cover open / close detection device according to claim 6,
The conductive elastic member has a dome shape in which the top is recessed by pressing the cover,
The second contact point is formed in an annular shape with an insulating layer provided in the center,
When the cover is opened, the insulating layer and the top are in contact with each other,
The cover open / close detection device, wherein the second contact and the conductive elastic member are in contact with each other when the cover is closed. The cover open / close detection device according to any one of claims 1 to 3,
And a detection circuit for determining a magnitude of an electrical resistance between a first contact formed on one surface of the multilayer substrate and a first contact formed on the other surface of the multilayer substrate. Cover open / close detection device. The cover open / close detection device according to any one of claims 1 to 8,
A cover open / close detection device comprising a pressing member that presses the second contact against the first contact between the second contact and the cover. A cover open / close detection device comprising: a first contact formed on a surface of a multilayer substrate; and a second contact whose contact state changes with the opening and closing of the cover,
The first contact is formed on both surfaces of the multilayer substrate;
The cover and the second contact are disposed on both sides of the multilayer substrate,
The multilayer substrate connects one first contact and the other first contact of the multilayer substrate to each other,
It further comprises a detection circuit for determining the magnitude of electrical resistance between a second contact formed on one surface side of the multilayer substrate and a second contact formed on the other surface side of the multilayer substrate. Cover open / close detection device. An automatic transaction apparatus equipped with an input device,
The input device is:
A multilayer substrate having first contacts formed on both sides;
A plurality of covers disposed on both sides of the multilayer substrate;
A plurality of second contacts disposed on both sides of the multilayer substrate, the contact state of the first contact changing with the opening and closing of the cover;
A connection line connecting the second contact on one surface side of the multilayer substrate and the second contact on the other surface side of the multilayer substrate;
It has a detection circuit for determining the magnitude of the electrical resistance between the first contact formed on one surface of the multilayer substrate and the first contact formed on the other surface of the multilayer substrate. Automatic transaction equipment.

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