JP5378076B2 - Data safety case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the safety case of data with a simple configuration. <P>SOLUTION: The safety case 1 of the data securing safety of the data by sealing an electronic part P requiring security includes: a sidewall part 20 surrounding a housing area 40 housing the electronic part P; and an upper wall part 10 and a lower wall part 30 fixed to the top and bottom of the sidewall part 20. A base material where wiring patterns 60 and 60' for detecting breakage is provided to the upper wall part 10, the lower wall part 30, and the sidewall part 20. A base material provided to the sidewall part 20 includes ribbon-like flexible base materials 230 and 240. The flexible base materials 230 and 240 are provided extending the whole periphery of the sidewall part 20 and arranged multiply in the thickness direction of the sidewall part 20. <P>COPYRIGHT: (C)2011,JPO&amp;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 Patent Document 1.
The thing of patent document 1 is the printed pattern wiring film affixed on the inner surface of the safety case which accommodated the electronic component which requires 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 is a data safety case for enclosing 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 electronic components, and an upper wall portion and a lower wall portion that are fixed above and below the side wall portion,
While providing the base material on which the wiring pattern for failure detection is formed on the upper wall part, the lower wall part and the side wall part, the base material provided on the side wall part is configured from a ribbon-like flexible base material,
The side wall portion has a multilayer structure in which the cylindrical second side wall structure member is positioned inside the cylindrical first side wall structure member,
A flexible base material is provided on each of the inner periphery and the outer periphery of the second side wall structure member over the entire circumference in the circumferential direction of the second side wall structure member, and the flexible base materials are arranged in multiple layers in the thickness direction of the side wall portion. And
The second side wall structure member having the flexible base material provided on the inner periphery and the outer periphery and the first side wall structure member were integrally formed by molding to provide a data safety case having a side wall portion.

  Of the base material on which the wiring pattern for failure detection is formed, the base material provided on the side wall portion of the safety case is constituted by a ribbon-like flexible base material, and the ribbon-like flexible base material is formed around the entire circumference of the side wall portion. Therefore, data safety can be ensured and wiring is not complicated as compared with the case where a base material on which a wiring pattern is formed for each side wall of the side wall portion surrounding the accommodation area is provided. In particular, since the flexible base material is arranged in multiple directions in the thickness direction of the side wall portion, the safety is further improved.

It is a disassembled perspective view of the safety case concerning an embodiment. It is a figure explaining the safety case concerning an embodiment. It is a figure explaining the lower wall part of a safety case. It is a figure explaining the upper wall part of a safety case. 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 the side wall part of a safety case. It is a figure explaining the side wall part of a safety case. It is a figure explaining the outer frame of a side wall part. It is a figure explaining the center frame 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 frame of a side wall part. It is a figure which shows the state which attached the flexible base material to the center frame. 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 explaining the side wall part concerning a modification. It is a disassembled perspective view of the side wall part concerning a modification.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is an exploded perspective view of a safety case 1 according to the embodiment, FIG. 2A is a plan view of the safety case 1, and FIG. 1B is a cross-sectional view taken along line AA in FIG. (C) is a cross-sectional view taken along line BB in (a), and (d) is a diagram schematically showing an enlarged region surrounded by an arrow X in (b).

As shown in FIGS. 1 and 2, 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. Configured.
The upper wall portion 10 and the lower wall portion 30 are fixed to the upper portion and the lower portion of the side wall portion 20 by screws N1 and N2, respectively, and accommodate (enclose) the electronic component P requiring security inside the safety case 1. Area 40 is formed.

  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. .

  (A) of FIG. 3 is the top view which looked at the lower wall part 30 from the upper direction by the side of the upper wall part 10, (b) is the AA sectional view in (a), (c) is ( It is the figure which expanded and showed typically the area | region enclosed by the arrow X in b).

  As illustrated in FIG. 3C, 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 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 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 board layer 33 is a circuit board on which electronic components requiring security are mounted, and board wiring (not shown) is formed.
As shown in FIG. 3A, on the surface facing the upper wall portion 10 of the lower wall portion 30 (substrate layer 33), a placement portion 34 exposed to the accommodation area 40 in the safety case 1, and a placement portion. A ring-shaped concave groove 35 surrounding the placement portion 34 is provided.

  In addition to the electronic component P requiring security, the mounting portion 34 is provided with connector terminals C1 and C2 exposed on the surface. The connector terminals C1 and C2 are used for connection of respective wiring patterns for detection of damage described later provided on the side wall portion 20.

As shown in FIGS. 3A and 3C, the concave groove 35 is formed with a depth h1 that does not penetrate the substrate layer 33 in the thickness direction, and the first groove portions 35a and 35b parallel to each other, The first groove portions 35a and 35b are connected to each other, and the second groove portions 35c and 35d are parallel to each other.
When viewed from the mounting portion 34, on the outside of the first groove portions 35a and 35b, an insertion hole 36 for a screw N2 (see FIG. 1) for fixing the lower wall portion 30 to the side wall portion 20 is provided in the thickness direction of the lower wall portion 30. It is provided to penetrate through.
Two insertion holes 36 are provided at predetermined intervals in the longitudinal direction of the first groove portions 35a and 35b, and an intermediate between the first groove portion 35a and the first groove portion 35b extends in parallel to the first groove portions 35a and 35b. They are located symmetrically across the line IM1.

  (A) of FIG. 4 is the top view which looked at the upper wall part 10 from the downward | lower direction of the lower wall part 30, (b) is the AA sectional view in (a), (c) is ( It is the figure which expanded and showed typically the area | region enclosed by the arrow X in b).

  As shown in FIG. 4C, the upper wall portion 10 has a multilayer structure in which the outer wall layer 11, the breakage detection layer 12, and the substrate layer 13 are arranged in order from the outside of the safety case 1.

The outer wall layer 11 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 in the same manner as the outer wall layer 31 described above.
The breakage detection layer 12 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, like the breakage detection layer 32 described above, breakage of the upper wall portion 10. It is provided to detect

The board layer 13 is a circuit board on which electronic components requiring security are mounted in the same manner as the board layer 33 described above.
On the surface facing the lower wall portion 30 of the upper wall portion 10 (substrate layer 13), the mounting portion 14 exposed to the accommodation area 40 in the safety case 1 and the ring-shaped concave groove 15 surrounding the mounting portion 14 are provided. And are provided.

  In addition to the electronic components that require security, the mounting portion 14 is provided with a connector (not shown), and is provided in the upper wall portion 10 and the lower wall portion 30 for detecting damage described later. The patterns are connected to each other through this connector.

The concave groove 15 is formed in a shape that matches the concave groove 35 (see FIG. 3) of the lower wall portion 30, and faces the concave groove 35 with the side wall portion 20 described later being sandwiched in a state where the safety case 1 is assembled. (See FIG. 2D).
The concave groove 15 is formed with a depth h1 that does not penetrate the substrate layer 13 in the thickness direction, similarly to the concave groove 35, and is parallel to the first groove portions 15a and 15b and the end portions of the first groove portions 15a and 15b. It is comprised from the mutually parallel 2nd groove parts 15c and 15d which connect mutually.

As shown in FIG. 4A, a screw N <b> 1 (see FIG. 1) that fixes the upper wall portion 10 to the side wall portion 20 is inserted outside the first groove portions 15 a and 15 b when viewed from the placement portion 14. The hole 16 is provided through the upper wall portion 10 in the thickness direction.
Two insertion holes 16 are provided at a predetermined interval in the longitudinal direction of the first groove portions 15a and 15b, and the insertion hole 16 located on the upper side in the drawing has an intermediate portion between the first groove portion 15a and the first groove portion 15b. It is located symmetrically across an imaginary line IM1 extending parallel to the one groove portions 15a, 15b.

As shown in FIG. 2C, the insertion hole 16 of the upper wall portion 10 and the insertion hole 36 of the lower wall portion 30 are formed in the width direction of the upper wall portion 10 and the lower wall portion 30 (the direction of the imaginary line IM1). The upper wall portion 10 and the side wall portion 20 and the lower wall portion 30 and the side wall portion 20 are connected by different screws N1 and N2, respectively.
When the insertion hole 16 and the insertion hole 36 are provided coaxially and the upper wall portion 10, the side wall portion 20, and the lower wall portion 30 are connected to each other using a common screw, This is because the safety case 1 can be easily disassembled simply by removing the screws.

  In the embodiment, a micro switch (not shown) is provided in the accommodation area 40 of the safety case 1. This micro switch is provided to detect that at least one of the upper wall portion 10 and the lower wall portion 30 has been removed from the side wall portion 20. In the safety case 1, it is detected that the removal has been made. Then, the information stored in the information memory is erased. Details of the microswitch are disclosed in, for example, Japanese Patent Laid-Open No. 62-239251.

Hereinafter, the wiring pattern of the destruction detection layers 12 and 32 will be described.
The wiring pattern is configured by sandwiching both sides of a single line (one-stroke writing) detection line with a ground line, and the pattern covers the entire surface of the base material by repeating this as a basic unit.
FIG. 5 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 detection 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 detection line 71 need not be insulated.
Here, each of the basic unit spirals 70 (70a, 70b, 70c,...) Is a square shape, and the detection line 71 turns from the outer periphery to the center in the clockwise direction (clockwise), turns back at the center, and turns counterclockwise (counterclockwise). Around) to return to the outer circumference.

Each line width of the detection line 71 and the ground line 72 is set to 0.15 mm or less, and a gap between the detection 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 detection lines 71 turned back at the center of the spiral, the gap between the detection 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 detection 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 linear portion of the detection 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 detection line 71 is a single line.
That is, the final side 71ab of the detection 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 detection 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 detection 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 detection 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 detection 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. 5 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. 6 shows the wiring pattern 60 ′ formed on the back surface of the substrate 50 as viewed from the back surface side, and both the detection 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. 5 with respect to the wiring pattern 60 on the front surface, and the detection 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 a gap between the corresponding detection line 71 and one ground line 72 that sandwiches the detection line. Therefore, the arrangement of FIG. 6 is close to the upper side of the substrate and the A line.

The detection 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 detection 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 wiring pattern detection lines 71 and 71 ′ and the ground lines 72 and 72 ′ 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.

Note that the spiral 70 connects through holes for attaching electronic components and the front and back surfaces of the substrate within a range corresponding to the accommodation area 40 formed between the upper wall portion 10, the side wall portion 20, and the lower wall portion 30. It is formed in a shape that avoids the connector part.
In FIG. 5, reference numeral 73 denotes a connector terminal portion of the ground line, and reference numeral 74 denotes a through hole portion.
Since the breakdown detection layer 12 is the same as the breakdown detection layer 32, description thereof is omitted.

(A) of FIG. 7 is a plan view of the side wall portion 20, and is a diagram showing the flexible base materials 230 and 240 with emphasis, (b) is a cross-sectional view taken along line AA in (a), ( (c) is the figure which expanded and showed the BB line cross section in (a) typically, (d) is the figure which expanded and showed the CC line | wire disconnection in (a) typically. And (e) is a diagram schematically showing an enlarged cross-sectional view taken along line DD in (a).
(A) of FIG. 8 is the figure which expanded and showed typically the area | region enclosed by the arrow X in (b) of FIG. 7, (b) is the EE line | wire in (a) of FIG. It is the figure which expanded and showed the cross section typically, (c) is the figure which expanded and showed the FF line | wire cross section in (a) of FIG. 7 typically.

The side wall portion 20 has a cylindrical shape when viewed from the axial direction, and includes a center frame 200, an inner frame 210 provided on the inner peripheral side of the center frame 200, an outer frame 220 provided on the outer peripheral side, It is configured with.
As shown in FIG. 8A, the side wall 20 has a multilayer structure in which a plurality of frames (an inner frame 210, a center frame 200, and an outer frame 220) are arranged in the thickness direction. Flexible base materials 230 and 240 are provided between the inner frame 210 and the inner frame 210 and between the center frame 200 and the outer frame 220, respectively.

In the embodiment, the inner frame 210 and the outer frame 220 are made of a resin material such as ABS, and the center frame 200 is made of a metal such as aluminum.
The center frame 200, the inner frame 210, and the outer frame 220 are integrally formed by molding.

Hereinafter, each frame which comprises the side wall part 20 is demonstrated.
9A is a plan view of the outer frame 220, FIG. 9B is a cross-sectional view taken along line AA in FIG. 9A, and FIG. 9C is a cross-sectional view taken along line BB in FIG. (D) is the figure which expanded the area | region enclosed with the arrow X in (b), and was shown typically.

The outer frame 220 has a cylindrical shape when viewed from the axial direction, and the first frame portions 220a and 220b that are parallel to each other and the second parallel to each other that connects the ends of the first frame portions 220a and 220b. Frame portions 220c and 220d.
In the outer frame 220, the four corners that are the connection portions between the first frame portions 220a and 220b and the second frame portions 220c and 220d have an R shape with a large curvature.

  Mounting portions 221a to 221d having screw holes 222 and 223 are provided on the outer circumferences of the first frame portions 220a and 220b, respectively, with the same protruding length L1.

  The attachment part 221a and the attachment part 221c are offset in the direction away from each other on the virtual line IM2 orthogonal to the first frame parts 220a and 220b. The attachment part 221b and the attachment part 221d are provided in the first frame part 220a. , 220b is provided symmetrically across an imaginary line IM1 extending parallel to the first frame portions 220a, 220b.

The outer peripheral side of the outer frame 220 is formed at the same height h2 as the attachment portions 221a to 221d over the entire periphery (see (d) of FIG. 9).
The inner circumferential side of the outer frame 220 protrudes by h1 in the vertical direction from the outer circumferential side over the entire circumference, and the inner circumferential side of the outer frame 220 has substantially ring-shaped convex portions 224 and 225 in a sectional view. Are formed vertically and have a height h3 as a whole.

When the safety case 1 is assembled, the convex portions 224 and 225 are fitted into the concave groove 15 of the upper wall portion 10 and the concave groove 35 of the lower wall portion 30, respectively.
The side wall 20 can be easily positioned between the upper wall 10 and the lower wall 30, and the side wall 20, the upper wall 10, and the lower wall 30 are viewed from the circumferential direction of the side wall 20. This is to prevent a gap from being generated between them.
Therefore, in the embodiment, the height h1 of the convex portions 224, 225 is set to be the same as the depth h1 of the concave grooves 15, 35.

  10A is a plan view of the center frame 200, FIG. 10B is a cross-sectional view taken along line AA in FIG. 10A, and FIG. 10C is a cross-sectional view taken along line BB in FIG. ) Is a cross-sectional view taken along the line CC in FIG.

The center frame 200 includes first frame portions 200a and 200b arranged in parallel to each other, and second frame portions 200c and 200d that are parallel to each other and connect the ends of the first frame portions 200a and 200b. Yes.
In the center frame 200, areas near the four corners that are connecting portions between the first frame portions 200a and 200b and the second frame portions 200c and 200d bulge inside the center frame 200, and the bulged portions Is an engaging portion 205 with an inner frame 210 described later.

  In the second frame part 200c, a notch 201 is provided on the upper surface on the upper wall part 10 side. The notch 201 is formed with a depth d in the range from the inner periphery 203 to the outer periphery 204 in the thickness direction of the second frame portion 200c.

In the embodiment, as shown in FIG. 7, the flexible base material 240 is attached to the outer periphery 204 of the center frame 200, and the notch 201 is provided at a position corresponding to the connection portion 242 of the flexible base material 240. Yes.
In the side wall portion 20 formed by assembling the center frame 200, the inner frame 210, and the outer frame 220, the connection portion 242 of the flexible base material 240 is bent inward to connect the connector terminal portion 242 a at the tip to the inner side of the side wall portion 20. This is because it is arranged in the accommodation area 40 formed in the above.
Therefore, the width direction length L2 of the notch 201 is set to be larger than the width dimension L3 of the connecting portion 242 (see FIG. 11B). Moreover, the depth d of the notch 201 is also set to a depth dimension larger than the thickness of the connection part 242, and when the side wall part 20 and the upper wall part 10 are assembled | attached, the side wall part 20 and the upper wall part 10 are used. A gap due to the connecting portion 242 is prevented from being generated between them.

As shown in FIG. 10D, the engaging portion 205 is provided along the inner periphery 203 of the four corners of the center frame 200, and has a T shape in a cross-sectional view.
The engaging portion 205 includes a locking portion 205a extending in the vertical direction at a height h4 lower than the height h3 of the center frame 200, and a connecting portion 205b connecting the center of the locking portion 205a in the vertical direction and the center frame 200. And.

  As a result, in the side wall portion 20 formed by molding, a fitting portion 210e of the inner frame 210 described later is provided so as to sandwich the locking portion 205a from above and below, so that the center frame 200 and the inner frame 210 are connected. The shape becomes complicated, and the bonding strength between the inner frame 210 and the center frame 200 is increased.

On the inner periphery 203 of the center frame 200, cylindrical projections 207 and 207a for inserting insertion holes 234 and 234a of the flexible base material 230, which will be described later, are provided protruding inward.
Further, on the outer periphery 204 of the center frame 200, cylindrical protrusions 208 and 208a for inserting insertion holes 244 and 244a of a flexible base material 240, which will be described later, are provided protruding outward.
In the following description, the protrusions 207 and 207a, and the protrusions 208 and 208a are simply referred to as protrusions 207 and 208 unless otherwise distinguished.

Two protrusions 207 and 208 are provided on each of the first frame portions 200 a and 200 b and the second frame portions 200 c and 200 d of the center frame 200.
The protrusions 207 and 208 of the first frame portions 200a and 200b are provided symmetrically between the first frame portions 200a and 200b with an imaginary line IM1 extending in parallel to the first frame portions 200a and 200b. .
The protrusions 207 and 208 of the second frame portions 200c and 200d are provided symmetrically across the virtual line IM2 that passes through the middle of the second frame portions 200c and 200d and is orthogonal to the virtual line IM1.

In the embodiment, the protrusion 207 is located closer to the center in the longitudinal direction of the first frame parts 200a and 200b and the second frame parts 200c and 200d, avoiding the engaging part 205, and the protrusion 208 is more than the protrusion 207. Located near the edge.
That is, the protrusion 207 and the protrusion 208 are provided at positions offset from each other in the circumferential direction of the center frame 200. When the center frame 200 is viewed from the circumferential direction, the protrusion 207 and the protrusion 208 are arranged coaxially. Not to be.

The flexible base materials 230 and 240 provided on the inner periphery 203 side and the outer periphery 204 side of the center frame 200 will be described.
11A is a plan view of the flexible base material 230, FIG. 11B is a plan view of the flexible base material 240, and FIG. 11C is a schematic cross-sectional view taken along line AA in FIG. (D) is the figure which showed typically the BB sectional view in (b).

As shown in FIGS. 11C and 11D, the flexible base materials 230 and 240 have a multilayer structure in which resin layers 230b and 240b such as polyimide are provided on both surfaces of the breakage detection layers 230a and 240a. The breakage detection layers 230a and 240a have a configuration in which a wiring pattern made of copper foil is provided on a flexible base material.
In the embodiment, the resin layers 230b and 240b described above are formed of a flexible resin material, and the flexible base materials 230 and 240 can be bent without disconnecting the wiring (not shown) formed inside. It has been made possible.

The flexible base materials 230 and 240 are constituted by ribbon-like main body portions 231 and 241 and connection portions 232 and 242.
The connection portions 232 and 242 are provided so as to extend from the side surface on one end side of the main body portions 231 and 241 in a direction orthogonal to the main body portions 231 and 241.
Connector terminal portions 232a and 242a are exposed and provided on one surface on the distal end side of the connection portions 232 and 242. The connector terminal portions 232a and 242a are used for connection between the wiring formed on the flexible base materials 230 and 240 and the wiring (wiring pattern) in the lower wall portion 30.

  In the embodiment, the connecting portions 232 and 242 are provided in the safety case 1 in a state where the connecting portions 232 and 242 are bent to the inner side (accommodating area 40 side) of the side wall portion 20. Therefore, substantially semicircular cutouts 233 and 243 are provided on both sides of the connection portions between the main body portions 231 and 241 and the connection portions 232 and 242 to prevent breakage from the connection portions due to bending. .

In the embodiment, the flexible base material 240 is attached by winding a ribbon-shaped main body 241 around the outer periphery 204 of the center frame 200.
Therefore, in the main body 241, an insertion hole 244 into which the protrusion 208 is inserted is provided at a position corresponding to the protrusion 208 of the center frame 200 in the thickness direction.

The main body portion 241 is formed with a length dimension such that the distal end side overlaps with the proximal end side where the connection portion 242 is provided in a state where the main body portion 241 is wound around the outer periphery 204 of the center frame 200.
Therefore, a rectangular notch 245 for avoiding interference with the connection portion 242 is provided on the side surface on the connection portion 242 side on the distal end side of the main body portion 241.

  In the main body 231 of the flexible base material 230, similarly to the flexible base material 240, an insertion hole 234 into which the protrusion 207 is inserted is provided at a position corresponding to the protrusion 207 of the center frame 200, penetrating in the thickness direction. Yes.

The main body portion 231 is formed with a length dimension such that the distal end side overlaps with the proximal end side where the connection portion 232 is provided in a state where the main body portion 231 is wound around the inner periphery 203 of the center frame 200.
Therefore, a notch 235 for avoiding interference with the connection portion 232 is provided on the side surface on the connection portion 232 side at the tip of the main body portion 231.

  Further, in the main body portion 231, notches 237 and 238 for avoiding interference with the engaging portion 205 of the center frame 200 are respectively provided on the side surface opposite to the side surface on the connection portion 232 side. A cutout 236 for avoiding interference with the connection portion 242 of the flexible base material 240 is provided on the side surface on the connection portion 232 side.

The wiring pattern of the breakdown detection layers 230a and 240a is configured by sandwiching both sides of a single-line (single-stroke) detection line with a ground line, and the pattern covers the entire surface of the base material by repeating this as a basic unit. ing.
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.

  12A is a plan view of the inner frame 210, FIG. 12B is a cross-sectional view taken along the line AA in FIG. 12A, and FIG. 12C is a cross-sectional view taken along the line BB in FIG. d) is a CC cross-sectional view in (a), and (e) is a DD cross-sectional view in (a).

The inner frame 210 is formed with the same height h3 as the height h3 of the center frame 200 and the outer frame 220 described above.
The inner frame 210 includes first frame portions 210a and 210b that are parallel to each other, second frame portions 210c and 210d that are parallel to each other in a direction orthogonal to the first frame portions 210a and 210b, first frame portions 210a and 210b, The end portions of the two frame portions 210c and 210d are connected to each other and have a fitting portion 210e to be fitted to the center frame 200. In the inner frame 210, the fitting portions 210e located on the same diagonal line are provided in parallel to each other.

As shown in FIGS. 12A, 12 </ b> C, and 12 </ b> E, in the second frame portions 210 c and 210 d, notches 211 and 212 are provided on the upper surface on the upper wall portion 10 side.
The notches 211 and 212 are formed with a depth d in the range from the inner periphery 214 to the outer periphery 215 of the second frame portions 210c and 210d.

As shown in FIG. 7, in the embodiment, the center frame 200 is located on the outer periphery 215 side of the inner frame 210, and the notch 211 is provided at a position corresponding to the notch 201 of the center frame 200. .
In the side wall portion 20 formed by assembling the center frame 200, the inner frame 210, and the outer frame 220, the connection portions 232, 242 of the flexible base materials 230, 240 are bent inward, and the connector terminal portions 232a, 242a at the leading ends are bent. Further, it can be arranged in the accommodation area 40 formed inside the side wall portion 20 without interfering with the notches 211 and 212.

  As shown in FIG. 12 (d), the fitting portion 210e has a C shape in a cross-sectional view, and the engagement portion 205 (engagement) of the center frame 200 is formed on the side wall portion 20 formed by molding. The stop portion 205a) is sandwiched from above and below by the fitting portion 210e (see (d) of FIG. 7).

The production of the safety case 1 according to the embodiment will be described.
First, the production of the side wall portion 20 will be described with reference to FIGS.
FIG. 13 is a diagram showing a state where the flexible base materials 230 and 240 are attached to the inner periphery 203 and the outer periphery 204 of the center frame 200.

The insertion hole 234a (see FIG. 11A) of the flexible base material 230 is inserted into the protrusion 207a (see FIG. 10) of the center frame 200, and the flexible base material 230 is positioned at the attachment start position.
Then, while the protrusions 207 of the center frame 200 are sequentially inserted into the insertion holes 234 of the flexible base material 230, the flexible base material 230 is provided along the inner periphery 203 of the center frame 200, and then the tip of the flexible base material 230. The protrusion 207a is inserted into the insertion hole 234b (see FIG. 7) on the side, and the flexible base material 230 is adhered and held on the inner periphery of the center frame 200.

Subsequently, the insertion hole 244b on the distal end side of the flexible base material 240 is inserted into the protrusion 208a (see FIG. 10) of the center frame 200, and the flexible base material 240 is positioned at the attachment start position.
Then, while the protrusions 208 of the center frame 200 are sequentially inserted into the insertion holes 244 of the flexible base material 240, the flexible base material 240 is provided on the outer periphery 204 of the center frame 200, and then the base end side of the flexible base material 240. The protrusion 208a is inserted into the insertion hole 244a, and the flexible base material 240 is adhered and held on the outer periphery of the center frame 200.
In this state, the connection portions 232 and 242 of the flexible base materials 230 and 240 are bent inside the center frame 200, and the connector terminal portions 232a and 242a at the leading ends are arranged in the accommodation area 40 of FIG. 13.

Here, the main body portion 231 of the flexible base material 230 is provided with the proximal end side where the connection portion 232 is provided and the opposite distal end side, and the main body portion 241 of the flexible base material 240 is provided with the connection portion 242. The base end side and the distal end side opposite to each other are provided so as to overlap each other, and the flexible base materials 230 and 240 are provided without breaks over the entire circumference of the center frame 200.
The overlapping portions of each of the flexible base materials 230 and 240 are bonded to each other with an adhesive.

Here, the flexible base materials 230 and 240 and the center frame 200 are bonded using an adhesive, but an adhesive layer may be provided on the surface of the flexible base materials 230 and 240 on the center frame 200 side. good.
In addition, the flexible base materials 230 and 240 may be provided in multiple numbers on the inner periphery 203 and the outer periphery 204 of the center frame 200.

  Subsequently, the center frame 200 around which the flexible base materials 230 and 240 are wound is set in a mold, the inner frame 210 and the outer frame 220 are formed by molding, and the inner frame 210 and the center frame 200 are formed. The side wall 20 is formed between the outer frame 220 and the center frame 200 with the flexible base materials 230 and 240 sandwiched therebetween. This state is shown in FIG.

In the side wall portion 20 formed in this way, the notch 212 of the inner frame 210 is located at the position of the connecting portion 232 of the flexible base material 230. Therefore, the connecting portion 232 is bent toward the notch 212, and the connector at the tip The terminal portion 232 a can be positioned inside the side wall portion 20 that becomes the accommodation area 40.
Further, the notch 211 of the inner frame 210 and the notch 201 of the center frame 200 are positioned in a straight line when the side wall part 20 is viewed from the circumferential direction at the position of the connecting part 242 of the flexible base material 240. The connector terminal portion 242a at the tip can be positioned inside the side wall portion 20 serving as the housing area 40 by bending the 242 toward the notches 211 and 201.

  Further, as shown in FIG. 8, in the side wall portion 20, the protrusions 207 and 208 of the center frame 200 are inserted into the insertion holes 234 and 244 of the flexible base materials 230 and 240, so Misalignment can be suitably prevented.

  Further, as shown in FIG. 8A, the heights of the inner frame 210, the center frame 200, and the convex portions 224 and 225 of the outer frame 220 are formed at the same height h3. An upper fitting portion 21 that fits into the groove 15 of the upper wall portion 10 and a concave portion of the lower wall portion 30 at one end of the side wall portion 20 on the upper wall portion 10 side and the other end of the lower wall portion 30 side. The lower fitting portion 22 that fits into the groove 35 is formed with a width W1 that substantially matches the concave grooves 15 and 35.

Next, assembly of the safety case 1 will be described.
First, as shown in FIG. 2 (d), the lower fitting portion 22 of the side wall portion 20 is fitted into the concave groove 35 of the lower wall portion 30, and the side wall portion 20 is placed on the lower wall portion 30. To do.
In this state, the screw N2 penetrating the insertion hole 36 of the lower wall portion 30 is screwed into the screw hole 223 of the attachment portions 221a to 221d (see FIG. 9), and the lower wall portion 30 and the side wall portion 20 are mutually connected. Link.

  And the connector terminal parts 232a and 242a (refer FIG. 11) of the flexible base materials 230 and 240 located in the accommodation area 40 of the side wall part 20 are connected to the connector terminals C1 and C2 of the lower wall part 30, and the side wall part The wiring pattern formed in 20 and the wiring pattern formed in the lower wall portion 30 are connected. Thereby, the detection lines of these wiring patterns are connected in series to form a single line, and at the same time, the ground line is also connected.

  Subsequently, a connector terminal (not shown) of the lower wall portion 30 and a connector terminal (not shown) of the upper wall portion 10 are connected by a connection cable (not shown), and a wiring pattern formed in the upper wall portion 10 and the lower wall portion 30 are connected. The wiring pattern formed inside is connected. Thereby, the detection lines of these wiring patterns are connected in series to form a single line, and at the same time, the ground line is also connected.

Then, as shown in FIG. 2D, the upper fitting portion 21 of the side wall portion 20 is fitted into the concave groove 15 of the upper wall portion 10, and the upper wall portion 10 is placed on the side wall portion 20. .
In this state, the screw N1 penetrating the insertion hole 16 of the upper wall portion 10 is screwed into the screw hole 222 of the attachment portions 221a to 221d (see FIG. 9), and the upper wall portion 10 and the side wall portion 20 are mutually connected. By connecting, the safety case 1 shown in FIG. 1 is formed.

As described above, in the embodiment, the data safety case 1 that encloses the electronic component P that requires security and secures the safety of the data includes the side wall portion 20 that surrounds the storage area 40 that stores the electronic component P, and the side wall portion. 20 is composed of an upper wall portion 10 and a lower wall portion 30 fixed above and below, and a base material on which wiring patterns 60, 60 ′ for detecting breakage are formed is formed of an upper wall portion 10, a lower wall portion 30, and a side wall portion. 20, and the base material provided on the side wall portion 20 is configured from flexible ribbon-like flexible base materials 230 and 240 having flexibility, and the flexible base materials 230 and 240 are formed over the entire circumference of the side wall portion 20. And provided in a multiple arrangement in the thickness direction of the side wall portion 20.
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 breakage detection provided on the side wall portion is formed as a ribbon-like flexible base material, the number of joints between the base materials can be reduced. 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.
In particular, since the flexible base material is arranged in multiple directions in the thickness direction of the side wall portion, the safety is further improved.

The side wall 20 has a multilayer structure in which a center frame 200, an inner frame 210, and an outer frame 220 are arranged in the thickness direction.
The flexible base materials 230 and 240 are configured to be provided on the inner periphery and the outer periphery of the center frame 200 on the inner side of the outer frame 220 positioned on the outermost side in the thickness direction of the side wall portion 20.
Thereby, since a flexible base material is provided twice in the thickness direction of a side wall part, access to the accommodation area from a side wall part becomes still more difficult, and the safety | security of the electronic component arrange | positioned in the accommodation area improves more. .

  In particular, the center frame 200 made of aluminum, the inner frame 210 made of a resin material, and the outer frame 220 are integrally formed by molding, so that the flexible base materials 230 and 240 are connected to the center frame 200, the inner frame 210, and the inner frame 210. It is securely sealed between the outer frame 220. Therefore, it becomes more difficult to access the flexible base material, and the safety of the electronic components arranged in the accommodation area is further improved.

Further, the upper wall portion 10 and the lower wall portion 30 have concave grooves 15 and 35 into which the upper fitting portion 21 at one end in the height direction of the side wall portion 20 and the lower fitting portion 22 at the other end are fitted. It was set as the structure provided.
Thereby, in the safety case 1, since there is no gap between the side wall part 20 and the upper wall part 10 and the lower wall part 30 when viewed from the circumferential direction of the side wall part 20, the side wall part 20 and the upper wall part 10 or lower A tool or the like cannot be inserted between the wall portion 30 and the like. Therefore, since access to the accommodation area can be prevented, the safety of the electronic components arranged in the accommodation area is further improved.

  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 on which the substrate wiring is formed, for example, a wiring for detecting breakage in a portion where an electronic component requiring security is mounted. Since the pattern is provided, 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 the one end side and the other end side in the circumferential direction of the ribbon-shaped flexible base materials 230 and 240 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. In this case, the flexible base materials 230 and 240 having the wiring pattern for detecting breakage are connected to each other without a break. 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 and 60 ′ included in each substrate are composed of detection lines 71 and 71 ′ and ground lines 72 and 72 ′ arranged on both sides of the detection lines 71 and 71 ′. Using the spiral 70 that turns from the outer periphery toward the center side and turns back at the center side, the plurality of basic units are repeated to cover the wall surface of the base material, form a single line as a whole, and linear portions of the detection lines 71 and 71 ′ The length D was set to 10 mm or less.
Thereby, breakage of the safety case can be detected by disconnection of the detection lines 71 and 71 ′ due to drilling, and depending on the part of the hole drilled by a drill or the like, the detection 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 detection lines 71 and 71 ′ and the ground lines 72 and 72 ′, the length is limited to 10 mm or less, so that it is possible to access the electronic component housing area requiring security. 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 detection lines 71 and 71 ′ The length is within 10 mm.
Furthermore, since the line width of each of the detection lines 71 and 71 ′ and the ground lines 72 and 72 ′ is 0.15 mm or less, and the predetermined gap between the detection line and the ground line is 0.15 mm or less, a particularly 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.

In the embodiment, as shown in FIG. 10, a protrusion 207 to be inserted into the insertion hole 234 (see FIG. 11) of the flexible base material 230 and a protrusion 208 to be inserted into the insertion hole 244 (see FIG. 11) of the flexible base material 240. Are provided on the inner periphery 203 and the outer periphery 204 of the center frame 200, respectively, and the protrusion 207 and the protrusion 208 are provided at positions offset from each other in the circumferential direction of the center frame 200. When viewed, the projection 207 and the projection 208 are configured not to be arranged on the same axis.
Since the break detection wiring patterns 60 and 60 ′ are not positioned in the insertion holes 234 and 244 in the flexible base materials 230 and 240, if the protrusions 207 and 208 are arranged coaxially, the protrusions Access to the accommodation area 40 is possible from the portion 207, 208 through the side wall portion 20, but by providing the projection 207 and the projection 208 so as not to be coaxially arranged, access to the accommodation area 40 can be achieved. It can prevent suitably.

  In addition, when only one flexible base material is provided on the side wall portion 20, it is possible to access the accommodation area 40 from the protrusion portion. However, in the embodiment, the side wall portion 20 is flexible in the thickness direction. Since two base materials are provided, and the protrusions 207 and 208 are provided at positions offset in the circumferential direction of the side wall part 20, access to the accommodation area 40 from the side wall part 20 can be reliably prevented. .

Next, a modification of the wiring pattern will be described. This simplifies the vortex for application to a small area substrate.
First, FIG. 14 is an explanatory diagram showing the process of simplifying the spiral.
FIG. 14A shows a multi-turn spiral from the start point S1 that turns 11 to the right (R), reaches the center, then turns left (L), and then 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. 14 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, which is substantially one spiral.
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. 14, 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. 15 is a diagram showing a case where a wiring pattern in which the spirals of (c) and (d) of FIG. 14 are combined is applied to a ribbon-like flexible substrate.

In the ribbon-shaped flexible substrate 250 shown in FIG. 15, a wiring pattern 60A in which the spirals of (c) and (d) of FIG. 14 are combined is arranged so as to cover the entire wall surface.
In this wiring pattern 60A, both sides of the detection line 71A are sandwiched between ground lines 72A, and the detection line 71A is a single line in the wiring pattern 60A on one surface. The length D of the straight line portion of the detection line 71A 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. In particular, since it can be applied to a narrow base material, by combining with the flexible base materials 230 and 240 of the embodiment, it is possible to detect unauthorized access on the entire wall surface of a flat case that accommodates a board on which electronic components are mounted. It is effective to do.
Furthermore, the wiring pattern can be densely provided over the entire flexible base material 250 while appropriately avoiding the insertion holes 255 of the flexible base material 250.

Next, a modification of the side wall portion will be described.
16A is a plan view of the side wall portion 20A according to the modification, FIG. 16B is a cross-sectional view taken along line AA in FIG. 16A, and FIG. 16C is a cross-sectional view taken along line BB in FIG. FIG. 17 is an exploded perspective view of the side wall portion 20A according to the modification.

  The side wall portion 20A according to the modification is the same as that of the above embodiment in that the center frame 200A is made of a resin material such as ABS, and the inner frame 210A and the outer frame 220A are made of a metal material such as aluminum. It is different from the side wall part 20.

In the side wall portion 20A, as in the case of the side wall portion 20, flexible base materials 230 and 240 are provided between the center frame 200A and the inner frame 210A and between the center frame 200A and the outer frame 220A, respectively. ing.
Therefore, the projections 207 and 208 corresponding to the center frame 200 of the side wall 20 are provided on the outer periphery of the inner frame 210A and the inner periphery of the outer frame 220A, and the protrusion 219 of the inner frame 210A. The protrusions 229 of the outer frame 220 </ b> A correspond to the protrusions 207 and 208.

As shown in FIG. 17, in the side wall portion 20A according to the modification, the shapes of the fitting portion 210e ′ of the inner frame 210A and the engagement portion 205 ′ of the center frame 200A are the same as those of the inner frame of the above-described embodiment. The shapes of the fitting portion 210e (see FIG. 12) 210 and the engaging portion 205 (see FIG. 10) of the center frame 200 are different.
Specifically, while the fitting portion 210e of the inner frame 210 has a C-shape in a cross-sectional view (see FIG. 7D), the fitting portion 210e ′ of the inner frame 210A is It has a U shape in a cross-sectional view (see FIG. 16C).
Therefore, in the side wall portion 20A according to the modification, the fitting portion 210e ′ is provided by being externally fitted to the engaging portion 205 ′ formed with a uniform height (thickness) from the inside of the center frame 200A. .

In the side wall portion 20A having such a configuration, an inner frame 210A with the flexible base material 230 attached to the outer peripheral surface and an outer frame 220A with the flexible base material 240 attached to the inner peripheral surface are set in a mold, and the center frame 200A is It is created by forming by molding.
Even with the side wall portion 20A having such a configuration, the same effects as those of the above-described embodiment can be obtained.

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, and may be a square shape having a concave or convex curved line as a side. In this case, a side corresponding to the spiral adjacent to 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.

In the embodiment, 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 detection line 71 ′ on one surface corresponds to the detection on the other surface. Since the lines 71 are shifted from each other so as to be positioned in a gap with any one of the ground lines 72, the detection lines 71 and 71 'are substantially the entire area of the wall surface of the base material when seen through from one side. Cover. For this reason, at the time of drilling, it is possible to disconnect or short circuit more reliably.
Further, the detection 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 detection lines of the wiring pattern of the base material provided 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.

  In the side wall 20 of the embodiment and the modified example, the center frame 200 and the inner frame 210 and the outer frame 220 on both sides of the center frame 200 are illustrated as being composed of different materials. All of the frames may be made of the same material, for example, a resin material.

Furthermore, in the side wall part 20 of the embodiment, the side wall constituent members (center frame 200, inner frame 210, outer frame 220) are arranged in the thickness direction, and three side wall constituent member layers are arranged in the thickness direction of the side wall part 20. Although the case where two are provided is exemplified, the side wall 20 may be formed by arranging four or more layers of side wall constituent members.
In such a case, the flexible base material is provided on each of the inner periphery and the outer periphery of the inner side wall constituent member relative to the outermost side wall constituent member in the thickness direction, or between the side wall constituent members constituting the side wall portion 20. If a flexible base material is provided at any two or more of the above, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Safety case 10 Upper wall part 20, 20A Side wall part 30 Lower wall part 11, 31 Outer wall layer 12, 32 Destruction detection layer 13, 33 Substrate layer 14, 34 Mounting part 15, 35 Concave groove (fitting groove)
16, 36 Insertion hole 40 Housing area 50 Base material 60, 60 ', 60A Wiring pattern 71, 71', 71A Detection line 72, 72 ', 72A Ground line 200, 200A Center frame (side wall component)
205 Engaging portion 207, 207a, 208, 208a Protrusion 210, 210A Inner frame (side wall component)
210e Fitting portion 219 Protrusion 220, 220A Outer frame (side wall component)
221a to 221d Mounting portion 222, 223 Screw hole 224, 225 Fitting convex portion 229 Protrusion 230, 240, 250 Flexible base material 230a, 240a Destruction detection layer 230b, 240b Resin layer 231, 241 Main body portion 232, 242 Connection portion 234, 234a, 234b, 244, 244a Insertion hole C1, C2 Connector terminal N1, N2 Screw 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 configured from a ribbon-like flexible base material. ,
The side wall portion has a multilayer structure in which a cylindrical second side wall structure member is positioned inside a cylindrical first side wall structure member,
The flexible base material is provided on each of the inner periphery and the outer periphery of the second side wall structure member over the entire circumference in the circumferential direction of the second side wall structure member, and the flexible base material is formed in the thickness direction of the side wall portion. Are arranged in multiple,
The second side wall structure member provided on the inner periphery and the outer periphery of the flexible base material and the first side wall structure member are integrally formed by molding to form the side wall portion. Data safety case. 2. The data safety case according to claim 1, wherein one of the first side wall structure member and the second side wall structure member is made of a metal material. The side wall portion has a multilayer structure in which a cylindrical third side wall structure member is located inside the second side wall structure member, and the first side wall structure member, the second side wall structure member, and the third side wall structure member. The data safety case according to claim 1 or 2 , wherein the side wall portion is integrally formed by molding . It is a data safety case that encloses electronic components that require security to ensure data safety,
The safety case is composed of a cylindrical 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 configured from a ribbon-like flexible base material. The flexible base material is provided over the entire circumference of the side wall part, and is arranged in multiple in the thickness direction of the side wall part,
A data safety case , wherein at least one of the upper wall portion and the lower wall portion is provided with a fitting groove into which an end portion in the height direction of the side wall portion is fitted.   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 according to any one of claims 1 to 4.   6. The data according to claim 1, wherein one end side and the other end side in the circumferential direction of the flexible base material overlap with each other at the side wall portion. Safety case.   The base material is embedded in at least one of the upper wall portion, the lower wall portion, and the side wall portion. The data safety case described in section.   The data according to any one of claims 1 to 6, wherein the base material is embedded in the upper wall portion, the lower wall portion, and the side wall portion. Safety case. The breakdown detection wiring pattern includes a detection line and a ground line arranged with a predetermined gap on both sides of the detection line.
The detection line is directed from the outer periphery to the center, and a spiral that folds at the center is 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 detection line The data safety according to any one of claims 1 to 8, wherein the length is set to 10 mm or less so that a disconnection of the detection line or a 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.   11. The data safety case according to claim 9, wherein line widths of the detection line and the ground line are each 0.15 mm or less, and the predetermined gap is 0.15 mm or less.

Images