JP2012169119A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a tamper to be detected accurately using a tamper detection switch.SOLUTION: An electronic device includes: first and second members that are connected to each other by a screw; a contact member on the surface of which a pair of contacts formed of a conductive material are provided; and a conduction member that is formed of a conductive material and causes conduction between the contacts when the conduction member comes into contact with each of the contacts. In addition, the contact member and the conduction member are interposed between the first and second members so that each of the contacts faces the conduction member, and in the state, the first and second members, the contact member, and the conduction member are fastened together by the screw to contact each of the contacts to the conduction member.

Description

  Embodiments described herein relate generally to an electronic apparatus including a switch that detects conduction or non-conduction between contacts.

  2. Description of the Related Art Conventionally, a mechanism including a mechanical tamper detection switch is known as a mechanism for detecting an action (tamper) in which a malicious person opens a casing of various devices or steals parts inside the casing.

  As the mechanical tamper detection switch, for example, it has a pair of contacts and a conductive member that is separated from and connected to the contacts, and when the device casing is closed or when the device parts are normally attached. There is one in which the conductive member causes the contact points to conduct. In such a tamper detection switch, it is possible to detect the opening of the casing or the removal of the parts by detecting the conduction or non-conduction of the respective contacts.

JP 2003-337753 A

  In the tamper detection switch as described above, the housing of the device and each part constituting the tamper detection switch are deformed due to vibration during transportation or deterioration with time, or an elastic member that biases the conductive member to each contact. There is a problem that the tamper detection accuracy is lowered due to deterioration of the elastic characteristics.

  In other words, the tamper detection switch detects a tamper when the housing is opened or when a part is removed, or when the housing is closed or when the part is installed normally. May end up.

  Under such circumstances, when the mechanical tamper detection switch as described above is used, it is necessary to take means for enabling accurate tamper detection.

  In order to solve the above-described problem, an electronic apparatus according to an embodiment includes a first member and a second member that are coupled to each other by a screw, and a contact member that has a pair of contacts formed of a conductive material provided on a surface thereof. A conductive member that is formed of a conductive material and conducts between the contact points when the contact points come into contact with the contact points, and the contact member and the conductive member are opposed to the contact points and the conductive member. In this state, it is interposed between the first and second members, and in this state, the first and second members, the contact member, and the conductive member are fastened together and fixed by the screw, and the respective contacts and the conductive member are fixed. It is characterized by contacting the member.

The schematic diagram which shows the housing | casing in 1st Embodiment, and its internal structure. The schematic diagram which looked at PCB shown in FIG. 1 from the upper direction of the card payment terminal. The schematic diagram which looked at PCB shown in FIG. 1 from the downward direction of the card payment terminal. The schematic diagram which shows the contact surface of the contact part in 1st Embodiment. The figure which shows the elastic member in the same embodiment. The figure which shows the electrically-conductive member in the same embodiment. The figure which shows the spacer in the same embodiment. The figure for demonstrating the fixing method of each member in the embodiment. The block diagram which shows the circuit structure of the switch unit in 1st Embodiment. The figure which shows a part of lower housing | casing in 2nd Embodiment. The figure which shows a part of upper side housing | casing in the embodiment. The figure for demonstrating the fixing method of each member in the embodiment. The figure which shows the contact part in a modification. The figure which shows the arrangement | positioning state of each contact part in a modification.

Hereinafter, some embodiments will be described with reference to the drawings.
(First embodiment)
In the first embodiment, a card payment terminal that reads a card such as a credit card, inputs PIN (Personal Identification Number) information, and uses this PIN information to make a card payment for a product or service is exemplified.

  FIG. 1 is a schematic diagram showing a case of a card settlement terminal and its internal structure in the present embodiment.

The case of the card settlement terminal 1 includes a lower case 2 and an upper case 3.
Each housing 2, 3 has a PCB (printed circuit board) 4 in which a circuit material is formed by baking a conductive material such as copper foil on a base material impregnated with an insulating resin, a plurality of contact conductive portions 20, One contact conductive portion 30 is incorporated.
The PCB 4 is mounted with various on-board devices such as a CPU (Central Processing Unit), a ROM (Read Only Memory) and a RAM (Random Access Memory), and a chip set.

  Each casing 2 and 3 includes an input unit having operation keys such as a numeric keypad, a display unit such as an LCD (Liquid Crystal Display), a card reader for reading PIN information from a card such as a credit card, and communication with the outside. A device such as a power supply circuit for supplying operation power to the communication unit and the card payment terminal 1 is built in.

  The memory stores a program for making a payment for goods and services, PIN information read by the card reader, an encryption key for encrypting the PIN information, and the like. The CPU executes a card payment process by executing a program stored in the memory.

  The upper housing 3 has a plurality of openings corresponding to the shapes of the input unit and the display unit. When the upper housing 3 is attached to the lower housing 2, the key tops of the operation keys of the input unit, the display screen of the display unit, and the like are exposed from the plurality of openings.

2 is a schematic view of the PCB 4 shown in FIG. 1 as viewed from above the card payment terminal 1, and FIG. 3 is a schematic view of the PCB 4 shown in FIG. Note that various on-board devices mounted on the PCB 4 are not shown.
The PCB 4 in the present embodiment has a rectangular shape, and circular contact portions 10 are provided at the four corners and the center thereof. Furthermore, through holes 4a for attaching the PCB 4 to the respective housings 2 and 3 are provided at the centers of the contact portions 10 at the four corners. Each through-hole 4a can be inserted with a fixing screw 40 (see FIG. 8), which will be described later, and is formed with a diameter smaller than the seating surface of the flange of the fixing screw 40.

  Each of the contact conductive portions 20 is provided for each contact portion 10 provided at the four corners. Each contact portion 10 and the corresponding contact conductive portion 20, and the contact portion 10 provided at the center of the PCB 4 and the contact conductive portion 30 constitute a tamper detection switch.

The contact part 10 is demonstrated.
FIG. 4 is a schematic diagram showing a contact surface of the contact part 10 with the contact conductive part 20.
As illustrated, the contact portion 10 includes a first contact 11, a second contact 12, a third contact 13, and an insulating layer 14.

  Each of the contacts 11 to 13 is obtained by baking a conductive material such as a copper foil on the PCB 4. That is, the surface of each contact 11-13 is a plane, and each surface is located on the same plane.

  The insulating layer 14 is a portion where the conductor is not baked on the PCB 4, and is interposed at the boundary between the contacts 11 to 13.

  The first contact 11, the second contact 12, and the insulating layer 14 interposed between the contacts 11 and 12 have a circular shape with a diameter of R1. The point P shown in FIG. 4 indicates the center of this circular shape. The third contact 13 has a ring shape that surrounds the first contact 11 and the second contact 12 with the point P as the center.

The contact portion 10 shown in FIG. 4 is designed to satisfy at least the following conditions.
(1) A part or all of the boundary between the first contact 11 and the second contact 12 is a non-linear shape in which the first contact 11 and the second contact 12 are complementary to each other with the insulating layer 14 interposed therebetween.
(2) The boundary between the first contact 11 and the second contact 12 is point-symmetric with respect to the point P.
(3) The areas of the first contact 11 and the second contact 12 are substantially the same.
Further, the insulating layer 14 is formed with the same width as a whole, but in the vicinity of the point P, the width is widened so as to surround the through hole 4a. In the example of FIG. 4, a part of the first contact 11 is meandered in a wave shape in which a peak portion and a valley portion are alternately repeated in a specific direction, and a part of the second contact 12 is meandered to compensate for this wave shape. Thus, a shape that satisfies the above conditions (1) to (3) is realized. If it is such a shape, the 1st contact 11 and the 2nd contact 12 will disperse | distribute moderately within the circle | round | yen of diameter R2 centering on P point.

Subsequently, the contact conductive portion 20 will be described with reference to FIGS.
The contact conductive portion 20 includes an elastic member 21, a conductive member 22, and a spacer 23.
As shown in FIG. 5, the elastic member 21 is formed by processing an insulating rubber into a cylindrical shape having an outer diameter R2 and a height H1 (natural length), and has a through hole having the same diameter as the through hole 4a of the PCB 4 at the center. A hole 21a is provided.

  As shown in FIG. 6, the conductive member 22 is formed by processing a conductive material such as various metals into a cylindrical shape having an outer diameter R2 and a height H2, and a through hole having the same diameter as the through hole 4a of the PCB 4 at the center. 22a is provided.

  Here, the outer diameter R2 of the conductive member 22 is set to a value smaller than the diameter R1 (R2 <R1). Specifically, the area of the upper surface and the bottom surface of the conductive member 22 is the total area of the first contact 11 and the insulating layer 14 interposed at the boundary between the contacts 11, 12, and the second contact 12 and each contact 11. , 12 is larger than the total area of the insulating layer 14 interposed at the boundary between the first contact 11, the second contact 12 and the insulating layer 14 interposed at the boundary between the contacts 11, 12. The value of the outer diameter R2 is set so as to decrease.

  As shown in FIG. 7, the spacer 23 is formed by processing an insulating material such as plastic into a hollow cylindrical shape having an inner diameter R2 and a height H3. The height H3 of the spacer 23 is set to a value slightly smaller than the sum of the height H1 of the elastic member 21 and the height H2 of the conductive member 22 (H3 <H1 + H2).

Next, a method for fixing the PCB 4, the contact conductive portions 20 and 30, and the housings 2 and 3 will be described.
FIG. 8 schematically shows a cross section taken along the line AA of the PCB 4 shown in FIG. 3, a cross section of the contact conductive portion 20 corresponding to the contact portion 10 provided at the position, and a part of a cross section of each of the housings 2 and 3. FIG.

  The PCB 4, each contact conductive part 20, and each housing 2, 3 are fixed by a flanged fixing screw 40 provided with a male screw of a predetermined pitch near its tip.

  A through hole 2 a through which the fixing screw 40 can be inserted is provided at a predetermined position of the lower housing 2. Further, a screw hole 3 a is formed at a predetermined position of the upper housing 3 to be screwed with a screw thread provided at the tip of the fixing screw 40.

When closing each case 2, 3, first, the elastic member 21 and the conductive member 22 are housed in the spacer 23. 2, 3, the positions of the through holes 2 a, 4 a, 21 a, 22 a of the lower casing 2, the PCB 4, the elastic member 21, and the conductive member 22, and the positions of the screw holes 3 a of the upper casing 3 Adjust. Then, the fixing screw 40 is inserted from the outside of the lower housing 2, and the fixing screw 40 is screwed into the screw hole 3a of the upper housing 3. When the fixing screw 40 is screwed into the screw hole 3a, the spacer is eventually obtained. 23 contacts both the lower housing 2 and the PCB 4, and the fixing screw 40 cannot be screwed any further. In this state, the elastic member 21 slightly shrinks from the natural length due to the relationship of H1 to H3, and a repulsive force corresponding to the amount of deformation and the spring constant of the elastic member 21 is generated. Due to this repulsive force, the conductive member 22 is urged against the contact portion 10, and one surface of the conductive member 22 and the contact portion 10 are brought into close contact with each other. That is, the conductive member 22 contacts both the first contact 11 and the second contact 12, and the contacts 11 and 12 are conducted.
Note that the screw hole 3 a is formed sufficiently deep so that the bottom portion thereof does not contact the tip of the fixing screw 40 even when the spacer 23 contacts both the lower housing 2 and the PCB 4.
The other contact portions 10 provided at the corners of the PCB 4 and the corresponding contact conductive portions 20 are also fixed by the same structure and method as described with reference to FIG.

  Further, the contact conductive portion 30 includes an elastic member 21 and a conductive member 22, as with each contact conductive portion 20. However, the elastic member 21 and the conductive member 22 may not have the through holes 21a and 22a. Furthermore, the contact conductive part 30 may not have the spacer 23. The contact conductive portion 30 having such a configuration is fixed in advance to the lower housing 2 by screwing or bonding using an adhesive. When the housings 2 and 3 are closed at each position using the fixing screw 40, the conductive member 22 of the contact conductive portion 30, and the first contact 11 and the second contact of the contact portion 10 provided at the center of the PCB 4 are provided. 12 contacts, and these contacts 11 and 12 are conducted.

Next, the control circuit of the switch unit including the tamper detection switch will be described.
FIG. 9 is a block diagram illustrating a circuit configuration of the switch unit.
The illustrated circuit includes any one tamper detection switch provided in the card payment terminal 1, and each contact point 11 to 13 of the tamper detection switch, the conductive member 22, the detection unit 51, the control unit 52, security. A processing unit 53 is included. The other tamper detection switches provided in the card settlement terminal 1 are also used with the same circuit configuration.

  The detection unit 51, the control unit 52, and the security processing unit 53 are realized by, for example, an onboard device mounted on the PCB 4, and operate by receiving power supply from a battery included in the card settlement terminal 1. Note that these units 51 to 53 do not stop their operations even when the card payment terminal 1 is not activated.

  The detection unit 51 is electrically connected to the contacts 11 to 13. When the conductive member 22 contacts any two or all of the contacts 11 to 13 at the same time, the contacted contacts are conducted. Different values of voltage are generated in the circuit including the contacts 11 and 12 and the detection unit 51 when the first contact 11 and the second contact 12 are conductive. In addition, when one or both of the first contact 11 and the second contact 12 and the third contact 13 are conducted, the circuit including the contact and the detection unit 51 is short-circuited. Even in this case, a voltage having a value different from that when the first contact 11 and the second contact 12 are conductive is generated in the circuit including the contact and the detection unit 51.

  The detection unit 51 detects conduction or non-conduction of each of the contacts 11 to 13 based on the change in the voltage value thus generated. When the non-conduction between the first contact 11 and the second contact 12 is detected, and when the conduction between at least one of the first contact 11 or the second contact 12 and the third contact 13 is detected, the detection unit 51 A signal notifying tamper detection is output to the controller 52.

  When the control unit 52 receives a signal notifying tamper detection from the detection unit 51, the control unit 52 outputs an operation signal to the security processing unit 53.

  In response to receiving the operation signal from the control unit 32, the security processing unit 53 executes predetermined processing such as erasing data stored in the memory mounted on the PCB 4. Note that the process executed by the security processing unit 53 may be a process for generating an alarm by generating a beep sound from a speaker included in the card settlement terminal 1. In this case, for example, the alarm may be continued until the power stored in the battery of the card payment terminal 1 is exhausted or until a predetermined release process is performed, or the alarm is stopped when a predetermined time has elapsed. Also good.

  The control unit 52 and the security processing unit 53 may be shared with circuits including other tamper detection switches.

Next, an operation of the present embodiment will be described.
If the parts constituting the casings 2 and 3 and the tamper detection switch are deformed due to vibration or deterioration with time during transportation of the card settlement terminal 1 or the elastic characteristics of the elastic member 21 deteriorate, the casings 2 and 3 The conductive member 22 and the contact portion 10 may be misaligned or the conductive member 22 may be tilted and contacted with the contact portion 10 despite being normally closed. In such a case, the switch unit does not detect the tamper even though the cases 2 and 3 are normally closed, or the switch unit does not detect the tamper even though the cases 2 and 3 are slightly opened. There is a risk that.

  However, in the present embodiment, the PCB 4 provided with the respective contact portions 10 and the corresponding contact conductive portions 20 corresponding thereto are fastened together by the fixing screws 40 that fix the housings 2 and 3. For this reason, even if the deformation of each part occurs as described above, the positional relationship between each contact part 10 and the corresponding contact conductive part 20 is not likely to shift, so that tamper detection accuracy can be kept good. it can.

  In addition, since the conductive member 22 is biased toward the corresponding contact portion 10 by the elastic member 21, each contact portion 10 and the conductive member 22 face each other when they are fastened together with the fixing screw 40. It becomes easy. Further, since the amount of deformation of the elastic member 21 is regulated by the spacer 23, the force with which the elastic member 21 of each contact conductive portion 20 biases the conductive member 22 against the corresponding contact portion 10 is kept constant. be able to.

  Further, as illustrated in FIG. 4, the first contact 11 and the second contact 12 are dispersed within a circle having a diameter R2 with the point P as the center. In this way, even when the contact area of the conductive member 22 is reduced due to the contact of the conductive member 22 with the contact portion 10, the conductive member 22 is in contact with both the contacts 11 and 12. It becomes easy.

In addition, since the first contact 11 and the second contact 12 are dispersed in the circle, regardless of the direction in which the conductive member 22 is tilted with respect to the contact portion 10, the one-contact portion is the contact 11. , 12 can be easily contacted. Therefore, the direction dependency of the contact part 10 can be reduced. Here, the direction dependency indicates the degree to which the conductive member 22 and the respective contacts 11 and 12 may not be in contact with each other depending on the direction in which the conductive member 22 is inclined when the conductive member 22 comes into contact with the contact portion 10. .
The direction dependency can be further reduced by dispersing the contact points 11 and 12 more than those illustrated in FIG. Preferably, the contact area of the conductive member 22 and the first contact 11, the conductive member 22 and the second contact, regardless of where the conductive member 22 contacts in the circle having the diameter R1 with the point P as the center, The contacts 11 and 12 are dispersed to such an extent that the contact area of 12 is substantially the same.

(Second Embodiment)
Next, a second embodiment will be described.
This embodiment is different from the first embodiment in that the function of the spacer 23 described in the first embodiment is realized by a part of the housings 2 and 3.
The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be given only when necessary.

  A protruding portion 60 shown in FIG. 10 is provided on the lower housing 2 of the card settlement terminal 1 in the present embodiment. The protrusion 60 is formed integrally with the lower housing 2 and has a hollow cylindrical shape having an inner diameter R3 and a height H4 that are concentric with the through hole 2a.

  Here, the inner diameter R3 is set to a value larger than the outer shape R2 of the elastic member 21 and the conductive member 22 (R3> R2). The height H4 is set to a value slightly smaller than the sum of the height H1 of the elastic member 21 and the height H2 of the conductive member 22 (H4 <H1 + H2).

  Further, the upper housing 3 in the present embodiment is provided with protruding portions 61 and 62 shown in FIG. The protrusions 61 and 62 are integrally formed with the upper housing 3. The protrusion 61 has a cylindrical shape with a screw hole 3a provided on the upper surface thereof. The protruding portion 62 is provided so as to surround the protruding portion 61 and has a hollow cylindrical shape having the same height as the protruding portion 61 and an inner diameter R3 that is concentric with the screw hole 3a.

Next, a method for fixing the PCB 4, the contact conductive parts 20, and the casings 2 and 3 in this embodiment will be described.
12 is a cross-sectional view taken along the line AA of the PCB 4 shown in FIG. 3, the contact conductive portion 20 corresponding to the contact portion 10 provided at the position, and the cross sections of the protrusions 60 to 62 of the casings 2 and 3. FIG.

  When closing each housing | casing 2 and 3, the elastic member 21 is first accommodated in the protrusion part 60 of the lower housing | casing 2, and also the electrically-conductive member 22 is accommodated from it. Next, the PCB 4 is sandwiched between the casings 2 and 3 so that the conductive member 22 in the protruding portion 60 and the contact portion 10 face each other, and the lower casing 2, the PCB 4, the elastic member 21, and the conductive member The positions of the through holes 2 a, 4 a, 21 a, 22 a of 22 are aligned with the positions of the screw holes 3 a of the upper housing 3. Then, the fixing screw 40 is inserted from the outside of the lower housing 2, and the fixing screw 40 is screwed into the screw hole 3 a of the upper housing 3.

As the fixing screw 40 is screwed into the screw hole 3a, the projecting portion 60 eventually comes into contact with the PCB 4, and the fixing screw 40 cannot be screwed any further. In this state, the elastic member 21 is slightly contracted from the natural length due to the relationship of H1, H2, and H4, and a repulsive force corresponding to the amount of deformation and the spring constant of the elastic member 21 is generated. Due to this repulsive force, the conductive member 22 is urged against the contact portion 10, and one surface of the conductive member 22 and the contact portion 10 are brought into close contact with each other. That is, the conductive member 22 contacts both the first contact 11 and the second contact 12, and the contacts 11 and 12 are conducted.
Note that the screw hole 3a is formed sufficiently deep so that the bottom portion thereof does not contact the tip of the fixing screw 40 even when the protruding portion 61 contacts the PCB 4.
Further, when the fixing screw 40 is screwed in until the projecting portion 60 and the PCB 4 come into contact with each other, the PCB 4 is held between the projecting portion 60 of the lower housing 2 and the projecting portions 61 and 62 of the upper housing 3. It becomes. Accordingly, the PCB 4 is more firmly fixed and a situation in which the PCB 4 is deformed by the pressing by the protruding portion 60 is prevented.

  The other contact portions 10 provided at each corner of the PCB 4 and the corresponding contact conductive portions 20 are also fixed by the same structure and method as described with reference to FIG.

  As described above, in the present embodiment, the protruding portion 60 is provided in a part of the lower housing 2, and the protruding portion 60 serves as a spacer that regulates the deformation amount of the elastic member 21. In this way, the number of parts can be reduced and the assembling process can be simplified as compared with the case where a spacer is separately prepared, and the manufacturing cost of the card settlement terminal 1 is reduced.

  Needless to say, the same effects as those of the first embodiment can be obtained.

(Modification)
Various modifications can be made to the configurations disclosed in the above embodiments. Specific examples of modifications are as follows.

  In each said embodiment, the card payment terminal 1 was illustrated as an example of an electronic device. However, the configuration related to tamper detection provided in the card payment terminal 1 is not limited to a personal computer, a server device, a POS (Point Of Sales) terminal or an ECR (Electric Cash Register), a printer, etc. used for payment of goods and services. You may apply to other apparatuses.

  In each of the above embodiments, the contacts 11 to 13 of the contact portion 10 are formed by baking a conductive material on the PCB 4 on which the CPU, chipset, and the like are mounted. However, the contacts 11 to 13 may be formed by baking a conductive material on an insulating member provided independently of the PCB 4. Alternatively, the contacts 11 to 13 may be manufactured by cutting or casting a conductive material, and the contact portion 10 may be configured by combining them. In this case, the insulating layer 14 may be realized by arranging the contacts 11 to 13 apart from each other, or the insulating layer 14 may be realized by filling between the contacts 11 to 13 with an insulating material. Also good.

In each of the above embodiments, the conductive member 22 is disposed on the lower housing 2 side, and the PCB 4 provided with the contact portion 10 is disposed on the upper housing 3 side. However, the PCB 4 may be disposed on the lower housing 2 side, the conductive member 22 may be disposed on the upper housing 3 side, and tightened together with the fixing screw 40.
Further, the elastic member 21 may be fastened together so that the PCB 4 is biased toward the conductive member 22. That is, for example, in the configuration of the first embodiment, the elastic member 21 and the spacer 23 are interposed between the PCB 4 and the upper housing 3. In this case, the height of the elastic member 21 and the spacer 23 may be adjusted so that the PCB 4 is appropriately biased with respect to the conductive member 22.

In the first embodiment, the amount of deformation of the elastic member 21 is regulated by bringing the spacer 23 and the PCB 4 into contact with each other. However, when the fixing screw 40 is screwed into the screw hole 3a by a predetermined amount, the spacer 23 is connected to either the lower housing 2 or another member connected to the lower housing 2 and the upper housing 3 or this. It may be configured to be in contact with either one of the other members, thereby restricting the deformation amount of the elastic member 21.
In the second embodiment, the amount of deformation of the elastic member 21 is restricted by bringing the protruding portion 60 provided on the lower housing 2 into contact with the PCB 4. However, when the fixing screw 40 is screwed into the screw hole 3a by a predetermined amount, the projecting portion 60 comes into contact with either the upper housing 3 or another member connected to the upper housing 3 and thereby the elastic member 21. The amount of deformation may be regulated.

  Moreover, in each said embodiment, the structure which detects opening of the housing | casing 2 and 3 by the tamper detection switch was illustrated. However, a tamper detection switch may be provided so as to detect the removal of various members or devices provided inside and outside the housings 2 and 3 instead of opening the housings 2 and 3. In such a configuration, the elastic member 21, the conductive member 22, the spacer 23, and the contact portion 10 described in the above embodiments are appropriately deformed and interposed between members and devices fixed by screwing. It is feasible.

In the above embodiments, the contact portion 10 has the shape shown in FIG. However, the shape of the contact portion 10 is not limited to that shown in FIG. A modification of the contact portion 10 is shown in FIG. Each of the illustrated contact portions 10a to 10d satisfies the above conditions (1) to (3). The contact portion 10a meanders a part of the first contact 11 in a specific direction so as to meander in a wave shape in which peaks and valleys are alternately repeated, and causes a part of the second contact 12 to meander to compensate for this wave shape. ing. Further, the contact portion 10b has a shape in which a part of the first contact 11 is swirled counterclockwise toward the point P, and a part of the second contact 12 is turned toward the point P so as to compensate for this shape. It has a shape that spirals clockwise. The contact portion 10c meanders a part of the first contact 11 in a wave shape in which a peak portion and a valley portion are alternately repeated in the same direction as the contact portion 10a, and further this wave shape is meandered in various directions. In order to compensate for this wave shape, a part of the second contact 12 is meandered. The contact portion 10d meanders a part of the first contact 11 so that the crests and troughs repeat alternately in a radial pattern around the point P, and meanders a part of the second contact 12 to compensate for this shape. I am letting.
In addition to those exemplified here, the direction dependency of the contact portion 10 can be further reduced by forming the first contact 11 and the second contact 13 in a two-dimensionally mixed shape.

Further, the shapes of the plurality of contact portions 10 provided in one electronic device may be different from each other, may be the same shape, and may be rotated according to the arrangement position. FIG. 14 shows an example in which the contact portion 10 having the same shape is rotated according to the arrangement position.
The illustrated contact portions 10e, 10f, 10g, and 10h represent the shapes of the contact portions 10 provided in the upper left, upper right, lower left, and lower right of the PCB 4 in FIG. 3 in this order. In addition, each contact part 10a-10d is the same shape as the contact part 10a of FIG. However, as the shapes of the contact portions 10a to 10d, the shapes shown in FIGS. 5 to 7 or other shapes may be used. When the contact portion 10e is in a state where the rotation angle is 0 °, the contact portion 10f is inclined 45 ° clockwise, the contact portion 10g is inclined 90 ° clockwise, and the contact portion 10h is inclined 135 ° clockwise. However, for example, the contact portions 10e and 10h are in a state where the rotation angle is 0 degree, and the contact portions 10f and 10g are inclined by 90 degrees. You may arrange.
Thus, if each contact part 10 provided in the card settlement terminal 1 is rotated according to the arrangement position or the shape thereof is changed, even if the positional relationship between each contact part 10 and the contact conductive part 20 is similarly shifted, all It is possible to prevent a situation in which the detection accuracy of the switch unit deteriorates simultaneously.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Card payment terminal, 2 ... Lower housing | casing, 3 ... Upper housing | casing, 4 ... PCB, 4a ... Through-hole, 10 ... Contact part, 20 ... Contact conductive part, 21 ... Elastic member, 21a ... Through-hole, 22 ... Conductive member, 23 ... Spacer, 40 ... Fixing screw, 2a, 21a, 22a ... Through hole, 3a ... Screw hole

Claims (6)

First and second members connected to each other by screws;
A contact member provided on the surface with a pair of contacts formed of a conductive material;
A conductive member that is formed of a conductive material and conducts between each of the contacts when the contact is made;
With
The contact member and the conductive member are interposed between the first and second members in a state where the contact points and the conductive member are opposed to each other, and in this state, the first and second members and the contact are formed by the screw. An electronic apparatus comprising: a member and the conductive member that are fastened together and fixed; and the contact points and the conductive member are brought into contact with each other.   The electronic apparatus according to claim 1, further comprising an elastic member that urges the conductive member toward the contact member.   The elastic member is deformed by being fastened together with the first and second members, the contact member, and the conductive member by the screw, and biases the conductive member by a repulsive force generated thereby. The electronic device according to claim 2.   The electronic apparatus according to claim 3, further comprising a spacer that regulates a deformation amount of the elastic member.   The spacer has a hollow shape surrounding the elastic member, and when the screw is screwed into the screw hole of the second member by a predetermined amount, either the first member or a member connected to the first member, and 5. The electronic apparatus according to claim 4, wherein the electronic device contacts either the second member or a member connected to the second member, thereby restricting a deformation amount of the elastic member.   The spacer is formed by a part of the first member or the second member, and when the screw is screwed into the screw hole of the second member by a predetermined amount, the spacer of the first member and the second member The electronic apparatus according to claim 4, wherein the electronic device is in contact with a member on which the spacer is not formed or a member connected to the member, thereby restricting a deformation amount of the elastic member.

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