JP2009193119A - Safety case for data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety case for data having simple constitution. <P>SOLUTION: The safety case 1 for data for securing the safety of data by sealing an electronic component P whose security is required is configured of a sidewall 20 surrounding a storage area 40 for storing an electronic component P and an upper wall 10 and a lower wall 30 fixed to the upper and lower parts of the sidewall 20, and a base material formed with wiring patterns 60 and 60' for destruction detection is installed at the upper wall 10 and the lower wall 30 and the sidewall 20, and a substrate installed at the sidewall 20 is configured of one ribbon-shaped flexible substrate 22, and installed over the whole periphery of the sidewall 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a safety case capable of preventing leakage of data held by an electronic component by detecting illegal access to a safety case containing an electronic component requiring security, such as an electronic transaction device.

In electronic transaction devices, etc., in order to prevent the customer's personal identification number and other information held inside from being illegally accessed and stolen from outside, a memory or circuit unit that requires security is accommodated in a special case. At the same time, there has been proposed a pattern plate that detects the destruction of the case at the time of unauthorized access.
An example of this type of fracture detection pattern plate is disclosed in Japanese Patent Application Laid-Open No. 11-353237.
This is a printed pattern wiring film affixed to the inner surface of a safety case containing electronic components that require security.

The wiring pattern in the printed pattern wiring film is a single power line arranged in a zigzag pattern. When a hole is opened in the safety case with a drill or the like by inserting it between the power source and the information memory, which is an electronic component. The disconnection is detected, the disconnection is detected, the information stored in the information memory is deleted, and the information stored in the information memory cannot be extracted.
The wiring pattern can be used by being inserted into the power supply system of the information memory, or connected to a breakage detection circuit and used for breakage detection of the safety case by disconnection.
JP-A-11-353237

  However, in the case of assembling a safety case by combining a plurality of failure detection pattern plates as in the conventional example described above, safety at the joint of each pattern plate cannot be ensured, and the wiring provided on each substrate is electrically connected. There is a problem that the wiring becomes complicated because it is necessary to connect to the cable.

  Therefore, in view of the above problems, an object of the present invention is to provide a safe case of data having a simple configuration.

  The present invention provides a data safety case that encloses electronic components that require security to ensure data safety, a side wall portion that encloses the storage area for storing the electronic components, an upper wall portion that is fixed above and below the side wall portion, and a lower wall portion. The base material on which the wiring pattern for detecting the destruction of the safety case is formed is provided on the upper wall part, the lower wall part, and the side wall part, and one base material provided on the side wall part is provided. It was set as the structure provided from the ribbon-shaped flexible base material of this, and provided over the perimeter of the side wall part.

  Of the base materials on which the wiring pattern for detection of destruction is formed, the base material provided on the side wall portion of the safety case is composed of a single ribbon-like flexible base material, and the ribbon-like flexible base material is provided on the side wall. Since it is provided over the entire circumference of the part, the safety of data can be ensured and the wiring is complicated compared to the case where a base material on which a wiring pattern is formed for each side wall of the side wall part surrounding the accommodation area is provided. Don't be.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1A is a perspective view of the safety case 1 according to the embodiment, and FIG. 1B is a cross-sectional view of the safety case 1 taken along a plane X indicated by a virtual line in FIG.

  The data safety case 1 according to the embodiment includes a flat upper wall portion 10, a cylindrical side wall portion 20, and a flat lower wall portion 30, and the upper wall portion 10 and the lower wall portion 30. Are respectively fixed to the upper part and the lower part of the side wall part 20, and a housing area 40 for housing (sealing) the electronic component P requiring security is formed inside the safety case 1.

  Here, an electronic component that requires security is, for example, an encryption key or a decryption key used for data encryption / decryption, a customer's personal identification number, etc. A memory for holding certain information.

  The upper wall portion 10, the side wall portion 20, and the lower wall portion 30 each have a multilayer structure, and have a base material on which a wiring pattern for detecting destruction of the safety case 1 is formed. .

2A is a plan view of the lower wall portion 30, and FIG. 2B is a diagram schematically showing a cross section taken along the line AA in FIG.
In addition, since the structure is the same as the upper wall part 10 and the lower wall part 30, only the lower wall part 30 is demonstrated here and description of the upper wall part 10 is abbreviate | omitted.

The lower wall portion 30 has a multilayer structure in which an outer wall layer 31, a breakage detection layer 32, and a substrate layer 33 are arranged in order from the outside of the safety case 1.
The lower wall portion 30 has a substantially rectangular shape in a top view, and bolt insertion holes 35 through which bolts (not shown) for fixing the lower wall portion 30 to the side wall portion 20 are inserted at the peripheral portions of the four corners. Is formed. A concave portion 34 into which a protruding portion 23d of the side wall portion 20 described later is fitted is formed at a substantially central portion of each side of the lower wall portion 30.

The outer wall layer 31 is a layer exposed to the outside of the safety case 1 and is used as a circuit board on which components that do not require security are mounted.
The board layer 33 is a layer exposed in the accommodation area 40 formed in the safety case 1 and is used as a circuit board on which board wiring (not shown) is formed and electronic components requiring security are mounted.
In addition to electronic components, connectors C1 and C2 are provided on the surface of the substrate layer 33 on the accommodation area 40 side. The connectors C1 and C2 are provided in the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. It is used for connection of each wiring pattern for the provided destruction detection.

  The breakage detection layer 32 is formed by providing a wiring pattern made of copper foil on both surfaces of an insulating base material made of glass epoxy material, and is provided for detecting breakage of the lower wall portion 30. Here, the thickness of the base material of the fracture detection layer 32 is, for example, 0.2 mm, and the thickness of the copper foil is 0.018 mm.

The wiring pattern is configured by sandwiching both sides of a single line (one-stroke writing) power supply line between ground lines, and the pattern covers the entire surface of the base material by repeating this as a basic unit.
FIG. 3 is a partially enlarged view of the breakage detection layer 32 and shows a part of the wiring pattern 60 including a plurality of spirals on one surface of the substrate 50. The solid line is the power line 71 and the broken line is the ground line 72. The ground line 72 need not be a single line, and the ground lines 72 on both sides of the power supply line 71 need not be insulated.
Here, the basic unit spirals 70 (70a, 70b, 70c,...) Are each square, and the power supply line 71 is directed from the outer periphery to the center in the clockwise direction (clockwise) and then turned back at the center to be counterclockwise (counterclockwise). Around) to return to the outer circumference.

Each line width of the power supply line 71 and the ground line 72 is set to 0.15 mm or less, and a gap between the power supply line 71 and the ground line 72 is also set to 0.15 mm or less. When there is no room for arranging the ground line 72 between the power supply lines 71 turned back at the center of the spiral, the gap between the power supply lines is preferably 0.15 mm or less.
The shape and the number of turns of the spiral 70 are adjusted so as to fit within the planar shape of the substrate 50 on which the wiring pattern 60 is arranged, but the linear portion D of the power supply line 71 is set to be 10 mm or less.
The reason why the line width and interval are set to 0.15 mm or less and the straight line portion of the power supply line 71 is set to 10 mm or less is that physical attack including work time with a drill or a knife becomes extremely difficult.

Next, the spiral 70 set as described above is connected while being connected so that the power supply line 71 is a single line.
That is, the final side 71ab of the power line of the first spiral 70a that starts from the lower right corner at the lower center also serves as the start side of the left second spiral 70b.
The final side 71bc of the power line of the second spiral 70b also serves as the start side of the upper third spiral 70c, and the final side 71cd of the power line of the third spiral 70c is the start of the right fourth spiral 70d. It also serves as a side.

Similarly, the final side 71de of the power line of the fourth spiral 70d also serves as the start side of the right fifth spiral 70e, and the final side 71ef of the power line of the fifth spiral 70e is the sixth side below it. It also serves as the starting side of the spiral 70f.
That is, since the spiral 70 of the basic unit can be continuously connected from any position in any of the upper, lower, left, and right directions, a large number of spirals 70 are arranged so as to cover the entire wall surface of the substrate 50. The

FIG. 3 shows the wiring pattern formed on one surface (front surface) of the base material 50, but the same shape as the wiring pattern on the surface when the other surface (back surface) of the base material 50 is seen through from the front surface side. The wiring pattern is formed. FIG. 4 shows the wiring pattern 60 ′ formed on the back surface of the substrate 50 as viewed from the back surface side. Both the power supply line 71 ′ and the ground line 72 ′ are symmetrical with the wiring pattern 60.
The wiring pattern 60 ′ on the back surface is shifted, for example, in an oblique 45 ° direction in FIG. 3 with respect to the wiring pattern 60 on the front surface, and the power supply line 71 ′ of the wiring pattern 60 ′ on the back surface in the wiring pattern 60 on the front surface when seen through. It is located in the gap between the corresponding power supply line 71 and one ground line 72 sandwiching the power supply line. Therefore, the arrangement of FIG. 4 is close to the upper side of the substrate and the A line.

The power supply lines 71 and 71 ′ of the wiring patterns 60 and 60 ′ on the front and back surfaces are connected in series to form a single line through the front and back surfaces. At this time, since the two-sided wiring patterns 60 and 60 ′ are the same, the ends of the power supply lines 71 and 71 ′ are in the same part and can be easily connected by a through hole or a connector penetrating the base material 50. it can.
The power supply lines 71 and 71 ′ and the ground lines 72 and 72 ′ of the wiring pattern are inserted into a power supply system of an electronic component that requires security or connected to a circuit that detects disconnection or short circuit.

As shown in FIG. 2A, the spiral 70 corresponds to the accommodation area 40 formed between the lower wall portion 30, the side wall portion 20, and the upper wall portion 10 in the lower wall portion 30. Within the range, it is formed in a shape that avoids a through hole for attaching an electronic component and a connector portion for connecting the front and back surfaces of the substrate.
In FIG. 3, reference numeral 73 denotes a connector terminal portion of the ground line, and reference numeral 74 denotes a through hole portion.

  5A is a plan view of the side wall portion 20, FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. 5C is a portion surrounded by a circle with a symbol M in FIG. (D) is a figure which expands the BB line section in (a), and is a figure which shows typically, and (e) is a CC line section in (a). It is a figure which expands and shows a figure typically.

The side wall part 20 has a cylindrical shape when viewed from the axial direction, and is formed by sandwiching a ribbon-like flexible base material 22 between the outer wall part 21 and the inner wall part 23. Each connection portion of the four walls of the side wall portion 20 has an R shape with a large curvature.
The outer wall portion 21 and the inner wall portion 23 are made of a resin such as ABS, and are formed by molding or the like. The outer wall portion 21 and the inner wall portion 23 may be made of a metal such as aluminum.

6A is a plan view of the outer wall portion 21, FIG. 6B is a diagram schematically showing an enlarged portion surrounded by a circle with a symbol N in FIG. 6A, and FIG. It is an AA line section in (a), and (d) is a figure showing the modification of projection 21a shown in (b).
On the inner peripheral surface of the outer wall portion 21, a protrusion 21 a that protrudes toward the accommodation area 40 is provided.
The protrusion 21 a is positioned in the vicinity of a notch 23 c of the inner wall portion 23 described later, and is used for positioning when the flexible base material 22 is attached to the inner peripheral surface of the outer wall portion 21.

  A substantially central portion of each side of the outer wall portion 21 extends in the axial direction of the outer wall portion 21 to form a protruding portion 21b. As shown in FIG. 6C, the protruding portion 21b is provided with a main body portion 21b1 extending in the axial direction of the outer wall portion 21, and extending from one end of the main body portion 21b1 to the accommodation area 40 side. And a support portion 21b2 for supporting one end of the base material 22 with the recess 21b3.

FIG. 7A is a plan view of the flexible base material 22, and FIG. 7B is a diagram schematically showing a cross section taken along line AA in FIG.
The flexible base material 22 includes a ribbon-like main body portion 22a and a connection portion 22b.
The connecting portion 22b extends from a side surface on one end side of the main body portion 22a in a direction orthogonal to the extending direction of the main body portion 22a, and the wiring formed on the flexible base material 22 is connected to the upper wall portion 10 or the lower wall portion. The connector 22c connected to the wiring (wiring pattern) formed in 30 is provided at the tip.

A cutout portion 22d is provided on the distal end side of the main body portion 22a. When the flexible base material 22 is attached to the outer wall portion 21 in the vicinity of the cutout portion 22d and in the vicinity of the connection portion 22b, the protrusion of the outer wall portion 21 is provided. Insertion holes 22e and 22f into which 21a is inserted are formed.
A connection portion between the main body portion 22a and the connection portion 22b is provided with a substantially circular notch 22g in order to prevent the flexible base material 22 from being broken from the connection portion.

As shown in FIG. 7B, the flexible base material 22 has a multilayer structure in which layers 22a2 of a resin material such as polyimide are provided on both surfaces of the breakage detection layer 22a1, and the breakage detection layer 22a1 It has the structure which provided the wiring pattern which consists of copper foil in a base material.
Here, a flexible material is used as the resin material, and the flexible base material 22 can be bent without breaking the wiring pattern formed inside the flexible base material 22.

The wiring pattern of the destruction detection layer 22a1 is configured by sandwiching both sides of a single-line (one-stroke) power supply line with a ground line, and the pattern covers the entire surface of the substrate by repeating this as a basic unit. .
The details of the wiring pattern are the same as those of the wiring patterns 60 and 60 ′ of the lower wall portion 30 described above, and therefore the description thereof is omitted here.

FIG. 8A is a plan view of the inner wall portion 23, and FIG. 8B is a diagram schematically showing a cross section taken along the line AA in FIG.
Bolt seats 23 a extending toward the accommodation area 40 are provided at the four corners of the inner wall portion 23, and the upper wall portion 10 and the lower wall portion 30 are fixed to the bolt seat 23 a above and below the side wall portion 20. Bolt insertion holes 23b into which bolts are inserted are formed.
A cutout 23 c is formed in a part of one side of the inner wall portion 23.
Note that the bolt seats do not have to be provided at the four corners of the inner wall portion 23, and two bolt seats may be provided on two opposite sides of the inner wall portion 23 as necessary.

  A substantially central portion of each side of the inner wall portion 23 is extended in the axial direction of the inner wall portion 23 to form a protruding portion 23d. The protruding portion 23d has a shape that is fitted around the protruding portion 21b of the outer wall portion 21, and the flexible base material 22 is placed in a space Q formed between the protruding portion 21b of the outer wall portion 21 indicated by a broken line in the drawing. It arrange | positions and the position shift to the axial direction of the flexible base material 22 is prevented.

  The extending width in the axial direction of the protruding portion 23d is substantially the same as the thickness of the upper wall portion 10 and the lower wall portion 30 described above, and the upper end 23e and the lower end 23f of the protruding portion 23d are respectively the upper wall portion 10 and the upper wall portion 10. The lower wall 30 is flush with the lower wall portion 30.

The production of the safety case 1 according to the embodiment will be described.
First, manufacture of the side wall part 20 is demonstrated, referring FIGS. 5-9.
FIG. 9 is a view showing a state in which the flexible base material 22 is attached to the inner peripheral surface of the outer wall portion 21.

The flexible base material 22 is positioned by inserting the insertion hole 22 f of the flexible base material 22 into the protrusion 21 a (see FIG. 6) of the outer wall portion 21.
Subsequently, the flexible base 22 is provided along the inner peripheral surface of the outer wall 21 while being bonded to the outer wall 21, and then the protrusion 21 a is inserted into the insertion hole 22 e (see FIG. 7) on the distal end side of the flexible base 22. And the flexible base material 22 is adhered and held on the inner peripheral surface of the outer wall portion 21. This state is shown in FIG.
At this time, one end side (region on the left side in the drawing including the cutout portion 22d) and the other end side (region on the right side in the drawing including the connection portion 22b) in the circumferential direction of the main body portion 22a of the flexible base material 22 illustrated in FIG. Is provided so as to overlap (see (a) of FIG. 9), the flexible base materials 22 are also bonded to each other in this overlapping portion.
As shown in FIGS. 9B and 9C, since the protruding portion 21b is formed on the outer wall portion 21, one end side of the flexible base material 22 is supported by the protruding portion 21b and positioned. Misalignment is prevented.
Here, adhesion between the flexible base material 22 and the outer wall portion 21 may be performed using an adhesive, or may be performed by providing an adhesive layer on the flexible base material 22.

  And the outer wall part 21 by which the flexible base material 22 was wound by the inner peripheral surface was set to a metal mold | die, the inner wall part 23 was formed by molding, and a flexible base material was formed between the inner wall part 23 and the outer wall part 21. The side wall part 20 with which 22 was inserted is formed (refer FIG. 5).

In the side wall part 20 formed in this way, the notch part 22d of the flexible base material 22 and the notch part 23c of the inner wall part 23 are located in the vicinity of the connection part 22b of the flexible base material 22, so that these notch parts 22d, At the portion 23c, the connecting portion 22b can be bent toward the accommodation area 40, and the connector 22c can be positioned at the accommodation area 40 (see FIG. 5D).
At this time, since the flexible base material 22 is provided with a substantially circular cutout 22 g, the bent connection portion 22 b is substantially the same as the upper surface of the outer wall portion 21 while preventing the flexible base material 22 from being broken. I try to be the same.

  Therefore, the wiring of the wiring pattern formed on the flexible substrate 22 and the wiring of the wiring pattern formed on the upper wall portion 10 and the lower wall portion 30 are connected within the accommodation area 40, and the upper wall portion 10 and the side wall portion are connected. 20, and the power supply lines of the respective wiring patterns provided in the lower wall portion 30 can be connected in series to form a single line.

  In addition, the protrusion 21a of the outer wall portion 21 is inserted into the insertion holes 22e and 22f of the flexible base material 22 (see FIG. 5D), and further, the protruding portion 23d of the inner wall portion 23 and the protruding portion 21b of the outer wall portion 21. Since the flexible base material 22 is sandwiched between them (see FIG. 5E), the flexible base material 22 can be reliably held between the outer wall portion 21 and the inner wall portion 23.

  The upper wall portion 10 and the lower wall portion 30 have a substrate layer 33 and an outer wall layer 31 so as to sandwich a breakage detection layer 32 provided with a wiring pattern made of copper foil on both surfaces of an insulating base material made of glass epoxy material. And are formed.

Next, assembly of the safety case 1 will be described.
First, the side wall portion 20 is placed on the lower wall portion 30, and the connector 22c (see FIG. 5) of the flexible base material 22 located in the accommodation area 40 of the side wall portion 20 is connected to the connector C1 (see FIG. 5). 2), the wiring pattern formed in the side wall portion 20 and the wiring pattern formed in the lower wall portion 30 are connected, and the power lines of these wiring patterns are connected in series to form a single line. And At the same time, the ground line is connected.

Subsequently, the connector C2 (see FIG. 2) of the lower wall portion 30 and the connector (not shown) of the upper wall portion 10 are connected by a connection cable (not shown) to form the upper wall portion 10. The wiring pattern and the wiring pattern formed in the lower wall portion 30 are connected, and the power lines of these wiring patterns are connected in series to form a single line. At the same time, the ground line is also connected.
Thereby, the wiring patterns formed in each wall of the safety case 1 are connected to each other, and the power lines of these wiring patterns are connected in series. A ground line is also connected.

Then, the upper wall portion 10 is placed on the side wall portion 20, and the upper wall portion 10 and the side wall are formed by bolts inserted into the bolt insertion holes 35 and 23 b of the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. The part 20 and the lower wall part 30 are connected to form a safety case 1 shown in FIG.
At this time, as shown in FIG. 5B, the side wall portion 20 is formed with a protruding portion extending in the axial direction by a protruding portion 21 b of the outer wall portion 21 and a protruding portion 23 d of the inner wall portion 23. Therefore, this convex part fits into the concave part 34 (refer FIG. 2) of the upper wall part 10 and the lower wall part 30, and improves the joining strength of the safety case 1. FIG.

As described above, in this embodiment, the data safety case 1 for enclosing the electronic component P that requires security to ensure the safety of the data, the safety case 1 being the storage area 40 for storing the electronic component P. A base material on which a wiring pattern 60, 60 ′ for detection of failure is formed is formed by a side wall portion 20 surrounding the upper wall portion 10 and a lower wall portion 30 fixed above and below the side wall portion 20. 10, the lower wall portion 30, and the side wall portion 20, and the base material provided on the side wall portion 20 is composed of a single ribbon-like flexible base material 22, and is provided over the entire circumference of the side wall portion 20. It was supposed to be.
As a result, it is not necessary to provide the base material on which the wiring pattern for detecting breakage is formed on each of the four walls of the side wall portion, so that the wiring connecting the wiring patterns of the substrates provided on each wall portion can be omitted. Can be simplified.
Furthermore, since the base material on which the wiring pattern for destructive detection provided on the side wall portion is formed as a single flexible base material, the number of joints between the base materials can be reduced, so that it is arranged in the accommodation area. This improves the safety of the electronic components.
Further, since the number of base materials in the safety case can be reduced, the assembly cost of the safety case can be reduced.

  Here, at least one of the upper wall portion 10 and the lower wall portion 30 is at least a part of the base material (substrate layer 33) on which the substrate wiring is formed, for example, a portion where an electronic component requiring security is mounted. Since it is formed by providing a wiring pattern for detecting destruction, at least one of the upper wall portion 10 and the lower wall portion 30 can be used as a circuit board on which electronic components requiring security are mounted.

  In particular, since one end side and the other end side in the circumferential direction of the ribbon-like flexible base material 22 provided over the entire circumference of the side wall portion 20 are partially overlapped, the side wall portion 20 is viewed from the circumferential direction. Moreover, the flexible base material 22 having the wiring pattern for detecting breakage is in a state of being seamlessly connected. Therefore, the safety of the electronic component arranged in the accommodation area 40 is further improved.

Further, the upper wall portion 10, the lower wall portion 30, and the side wall portion 20 are configured such that the base material on which the wiring patterns 60 and 60 ′ are formed is embedded.
Thereby, the surface by the side of the accommodation area 40 of the upper wall part 10, the lower wall part 30, and the side wall part 20 can be used as the mounting surface of the electronic component P, and the board | substrate for mounting the electronic component P can be used as an accommodation area. Since it is not necessary to provide in 40 separately, further miniaturization of safety case 1 is attained.

Furthermore, the wiring patterns 60, 60 ′ of each substrate are composed of power supply lines 71, 71 ′ and ground lines 72, 72 ′ arranged with a predetermined gap on both sides thereof. The spiral unit 70 is turned from the outer periphery to the center side and is folded back at the center side to cover the wall surface of the base material by repeating a plurality of basic units and to form a single line as a whole, as well as the straight portions of the power supply lines 71 and 71 ′ The length D was set to 10 mm or less.
Thereby, the breakage of the safety case can be detected by disconnection of the power supply lines 71 and 71 ′ due to drilling, and depending on the part of the drilling hole or the like, the power supply lines 71 and 71 ′ and the ground lines 72 and 72 ′ can be short-circuited. The destruction of the safety case can be detected.

  Furthermore, even if the cutter is cut into the gap between the power supply lines 71, 71 ′ and the ground lines 72, 72 ′, the length is limited to 10 mm or less, so that it is possible to access the security electronic component containing area. The incision cannot be opened to the extent.

In addition, since the last side of the first spiral among the continuous spirals forms the start side of the second spiral, if the size of each spiral 20 is 10 mm or less, the linear portions of the power supply lines 71 and 71 ′ The length is within 10 mm.
Furthermore, since the line width of each of the power supply lines 71 and 71 ′ and the ground lines 72 and 72 ′ is 0.15 mm or less and the predetermined gap between the power supply line and the ground line is 0.15 mm or less, a small diameter drill is used. Even when a hole is drilled, disconnection or short-circuiting is surely caused, and the accuracy of fracture detection is high.

Further, the same wiring pattern 60, 60 ′ is formed on both surfaces of the substrate when seen from one surface side of the substrate, and the power line 71 ′ on one surface is replaced with the corresponding power line 71 on the other surface. Since they are shifted from each other so as to be located in a gap with any one of the ground lines 72, the power supply lines 71 and 71 ′ cover substantially the entire region of the wall surface of the base material when seen through from one side. For this reason, at the time of drilling, it is possible to disconnect or short circuit more reliably.
Furthermore, the power supply lines 71 and 71 ′ in the wiring patterns 60 and 60 ′ on both surfaces of the base material are connected in series to form a single line, and in particular, on the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. Since the power supply lines of the wiring pattern of the provided base material are connected in series to form a single line, only one system is required for a disconnection or short circuit detection circuit, and the circuit configuration is simplified.

  Here, in the above embodiment, the shape of the protrusion 21a of the outer wall portion 21 is as shown in FIG. 6B, but as shown in FIG. 6D, the protrusion 21a is held at the tip of the protrusion 21a. The part 21c may be provided so that the flexible substrate 22 can be reliably prevented from falling off from the protrusion 21a.

Next, a modification of the wiring pattern will be described. This simplifies the vortex for application to a small area substrate.
First, FIG. 10 is an explanatory diagram showing the process of simplifying the spiral.
FIG. 10A shows a multi-turn spiral from the start point S1 that turns 11 to the right (R), reaches the center, then turns left (L), turns 11 and ends at the end point T1.
(B) shows the spiral which makes the number of windings small, turns 5 from the start point S2 to the right and reaches the center, then turns back to the left and turns 5 and ends at the end point T2.

(C) of FIG. 10 turns rightward from the start point S3 to the center side, and then turns back to the left to make three turns and ends at the end point T3.
As shown in (d), the number of folds is reduced in this way, and one side has two folds. That is, after turning from the start point S4 to the center side by two turns to the center side, turning back to the left and turning twice to end at the end point T4, it becomes a substantially half-turn spiral.

  Even if the wiring pattern according to the modified example configured as described above is employed, the same effects as those of the above-described embodiment can be obtained.

Here, among the simplified spirals shown in FIG. 10, the wiring pattern combining the spirals of (c) and (d) is particularly narrow and small in area such as a ribbon-shaped flexible substrate. It can be particularly suitably used.
FIG. 11 is a diagram showing a case where a wiring pattern in which the spirals of (c) and (d) of FIG. 10 are combined is applied to a ribbon-like flexible substrate.

In the ribbon-shaped flexible base material 22 ′ shown in FIG. 11, a wiring pattern 25 that combines the spirals of (c) and (d) of FIG. 10 is arranged so as to cover the entire wall surface.
In the wiring pattern 25, both sides of the power supply line 26 are sandwiched between ground lines 27, and the power supply line 26 is a single line in the wiring pattern 25 on one surface.
The length D of the straight line portion of the power supply line 26 is set to be 10 mm or less.

Even with such a wiring pattern, the same effects as those of the above-described embodiment can be obtained. And since it can be applied to narrow base materials in particular, it can detect unauthorized access on the entire wall surface of a flat case that houses a board on which electronic components are mounted by combining with the flexible base material of the embodiment. It is valid.
Furthermore, it is possible to densely provide the wiring pattern over the entire flexible base material 22 ′ while appropriately avoiding the insertion holes 28 of the flexible base material 22 ′.

Next, a modification of the side wall portion will be described.
12A is a plan view of the side wall portion 80 according to the modification, FIG. 12B is a cross-sectional view taken along line AA in FIG. 12A, and FIG. It is a figure which expands and shows typically the part enclosed by. FIG. 13A is a plan view of the inner wall 83 of the side wall 80 according to the modification, and FIG. 13B is a plan view of the flexible base material 82 of the side wall 80 according to the modification.

The side wall 80 according to the modification has a cylindrical shape when viewed from the axial direction, and is formed by sandwiching a ribbon-shaped flexible base material 82 between the outer wall 81 and the inner wall 83.
In the side wall portion 80 according to the modification, the outer wall portion 81 is made of a resin such as ABS, and the inner wall portion 83 is made of a metal such as aluminum, and each is formed by molding or the like.

Bolt seats 83 a extending toward the accommodation area 40 are provided at the four corners of the inner wall portion 83, and the bolt seats 83 a are bolts that fix the upper wall portion and the lower wall portion above and below the side wall portion 80. A bolt insertion hole 83b into which is inserted is formed.
Further, as shown in FIG. 13, a plurality of protrusions 83c for fixing the flexible base material 82 and a protrusion 83d for positioning are provided on the outer peripheral surface of the inner wall 83, and in the vicinity of the protrusion 83d. Is provided with a notch 83e.

  In the body portion 82 a of the flexible base material 82 positioned between the inner wall portion 83 and the outer wall portion 81, insertion holes 82 e and 82 f for positioning the flexible base material 82 and the outer periphery of the inner wall portion 83 are provided. An insertion hole 82g is provided through which the projection 83c on the surface is inserted to fix the flexible base material 82 to the inner wall portion 83.

The side wall portion 80 having such a configuration is created by setting the flexible base material 82 along the outer peripheral surface of the inner wall portion 83 and then setting the outer wall portion 81 by molding.
Even with such an inner wall 83, the same effects as those of the above-described embodiment can be obtained.

  Here, the side wall portion 80 according to the modification is not provided with a portion corresponding to the protruding portion 23d (see FIG. 5) of the side wall portion 20 described above, so that the upper wall fixed above and below the side wall portion 80 is provided. The portion corresponding to the concave portion 34 (see FIG. 2) of the lower wall portion 30 is not provided in the portion and the lower wall portion. Therefore, the outer peripheral shape of the upper wall part and the lower wall part fixed above and below the side wall part 20 has a shape that matches the outer peripheral shape when the side wall part 20 is viewed from the axial direction.

In the embodiment and the modification, the spiral shape is a quadrangular basic shape having straight sides, but a triangular or other polygonal shape may be the basic shape.
Furthermore, it is not limited to a straight side, but may be a rectangular shape having a concave or convex curved line as a side. In this case, a corresponding side of a spiral adjacent to the side of the concave curved line is defined as a convex curved line. By doing, the wall surface of a base material can be covered without gap.

Further, in the above-described embodiment, the safety case using the side wall portion 20 in which the base material in which the wiring pattern for detecting the failure is formed is embedded in each of the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. 1 has been described, the base material on which the wiring pattern for destructive detection is formed may be embedded in at least one of the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. In this case, the same effect as that of the above-described embodiment can be obtained by setting the surface of the wall portion in which the base material is embedded on the housing area 40 side as the mounting surface of the electronic component.
In this case, the base material in which the wiring pattern for the destruction detection is formed is fixed to the surface on the accommodation area 40 side of the wall portion where the base material is not embedded with an adhesive or the like, so that the destruction of the wall portion can be detected. You can do that.
In addition, since a breakdown detection wiring pattern can be formed on a part of the circuit board to form the upper wall portion 10 and the lower wall portion 30, a safety case can be provided at any position on the circuit board.

It is a figure explaining the safety case concerning an embodiment. It is a figure explaining a lower wall part. It is the elements on larger scale which show the wiring pattern on the surface of a base material. It is the elements on larger scale which show the wiring pattern of a base material back surface. It is a figure explaining a side wall part. It is a figure explaining the outer wall part of a side wall part. It is a figure explaining the flexible base material of a side wall part. It is a figure explaining the inner wall part of a side wall part. It is a figure explaining the state which attached the flexible base material to the outer wall part of a side wall part. It is explanatory drawing which shows the process of simplification of a spiral. It is a figure explaining the flexible base material which has the simplified spiral. It is a figure which shows the modification of a side wall part. It is a figure which shows the modification of a side wall part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Safety case 10 Upper wall part 20, 80 Side wall part 21, 81 Outer wall part 22, 22 ', 82 Flexible base material 23, 83 Inner wall part 25, 60, 60' Wiring pattern 26, 71, 71 'Power supply line 27, 72 , 72 'Ground line 30 Lower wall part 40 Storage area 50 Base material P Electronic component

Claims (11)

It is a data safety case that encloses electronic components that require security to ensure data safety,
The safety case is composed of a side wall portion that encloses an accommodation area that accommodates the electronic component, and an upper wall portion and a lower wall portion that are fixed above and below the side wall portion,
A base material on which a wiring pattern for failure detection is formed is provided on the upper wall portion, the lower wall portion, and the side wall portion, and the base material provided on the side wall portion is a single ribbon-like flexible base material. A safety case for data comprising the entire sidewall of the side wall. The at least one of the upper wall portion and the lower wall portion is formed by providing the breakdown detection wiring pattern on at least a part of a base material on which a circuit board is formed. The data safety case described in 1. 3. The data safety case according to claim 1, wherein the side wall portion is provided so that one end side and the other end side in the circumferential direction of the flexible base material overlap each other. 4. The substrate according to claim 1, wherein the base material is embedded in at least one of the upper wall portion, the lower wall portion, and the side wall portion. 5. The data safety case described in section.   The data according to any one of claims 1 to 3, wherein the base material is embedded in the upper wall portion, the lower wall portion, and the side wall portion. Safety case. The wiring pattern is composed of a power line and a ground line arranged with a predetermined gap on both sides of the power line,
The power supply line is directed from the outer periphery to the center, and a spiral that turns back at the center is used as a basic unit, and a plurality of basic units are repeated to cover both surfaces of the base material, forming a single line as a whole, and the linear portion of the power supply line 6. The data safety according to claim 1, wherein the length is 10 mm or less, and disconnection of the power supply line or short circuit with the ground line can be detected. Case. The shape of the spiral is a square shape connecting a plurality of sides, and the final side of the first spiral is the start side of the second spiral following the first spiral. Safety case for the listed data. 8. The data safety case according to claim 6, wherein a line width of each of the power supply line and the ground line is 0.15 mm or less, and the predetermined gap is 0.15 mm or less. The wiring pattern is formed on both sides of the substrate,
The wiring patterns on each surface are the same when seen through from one surface side of the substrate, and the power lines on one surface are shifted from each other so that they are located in the predetermined gaps over the corresponding power lines on the other surface. The data safety case according to claim 6, wherein the data safety case is provided. The data safety case according to claim 9, wherein power lines in the wiring patterns on both sides of the base material are connected in series to form a single line. The power supply line in the wiring pattern of the said base material provided in the said upper wall part, the said lower wall part, and the said side wall part is connected in series, and has comprised the single line. The data safety case described in any one of the above.

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