JP6327054B2 - Fiscal printer - Google Patents

Description

  The present invention relates to a fiscal printer capable of detecting unauthorized access to a circuit board on which an electronic component such as a memory is mounted.

  Fiscal printers are known as one of electronic devices that need to protect data from being tampered with. The fiscal printer has a function of printing print information related to sales transactions on a receipt and issuing a printed receipt, and a function of storing fiscal information related to sales transactions. As disclosed in Patent Document 1, the fiscal printer includes an EJ (electronic journal) memory that stores printing information for receipts, and a fiscal memory that stores fiscal information. In general, the EJ memory and the fiscal memory are covered with a black epoxy resin so as not to tamper with information stored in the memory, and cannot be illegally accessed from the outside.

  Patent Document 2 proposes an anti-fraud device for gaming machines. In this fraud countermeasure device, an electrode sheet on which electric writing lines written in a single stroke are densely arranged is arranged at a site to be protected, a weak current is passed through the electric wiring, and the energization state of the electric wiring is monitored. If the electrode sheet is torn by performing a destructive action, such as drilling a hole in the site to be protected by an unauthorized act, the one-stroke electric wiring formed there is also disconnected. Thereby, it can be detected that an illegal act has been performed. As the electrode sheet, a material similar to a general flexible printed wiring board is used. The fraud detection sheet has mechanical characteristics such as a predetermined tensile strength so as not to be cut or disconnected carelessly in a normal use state.

JP 2010-134580 A JP 2007-319464 A

  For example, it is conceivable to use a detection sheet on which a wiring pattern similar to the above electrode sheet is formed as a fraud detection mechanism for a fiscal printer. When a hole or the like is directly drilled in the detection sheet using a drill or the like, if the wiring for energization is formed in a dense pattern, the disconnection is surely caused, and an illegal act can be detected. However, in cases such as when the lid of a case containing a circuit board with a fiscal memory etc. is destroyed, the detection sheet with high tensile strength remains without breaking, the wiring pattern is not divided, and fraud May not be detected.

  An object of the present invention is to provide a fiscal printer that can reliably detect an illegal act using a detection sheet.

  In order to solve the above problems, the fiscal printer of the present invention is arranged between an inner case in which a circuit board is accommodated, an outer case in which the inner case is accommodated, and between the outer case and the inner case, At least a part is fixed with respect to the inner case, a detection sheet including a continuous wire for energization that does not have a branch point or an intersection in the middle, and is arranged between the outer case and the inner case, And a sheet pressing member sandwiching at least a part of the detection sheet between the outer case and the outer case.

  The detection sheet is fixed to the inner case side with an adhesive or the like, and is sandwiched between the outer case and the outer case by a sheet pressing member. When a force is applied from the outside of the outer case to destroy a part of the outer case, the force also acts on the detection sheet portion sandwiched between the outer case and the sheet pressing member. Since the detection sheet is also fixed to the inner case side, a large force acts between a portion of the detection sheet sandwiched between the outer case and the pressing member and a portion fixed to the inner case. . Accordingly, even when the outer case is destroyed, even if the detection sheet is not directly destroyed or cut, the detection sheet is also reliably cut, and the energization wiring formed there is also divided. Accordingly, it is possible to reliably detect unauthorized access to a circuit board on which an electronic component such as a CPU that manages the writing of information to the memory and the memory in which the fiscal information is stored.

  Here, when destroying the outer case and attempting to gain unauthorized access to the internal circuit board, the lid part of the outer case or the joint part between the lid part and the main body part of the outer case is destroyed, and the lid part is Often removed. Therefore, when the outer case includes an outer case main body and an outer case lid that seals the opening of the outer case main body, the detection sheet includes at least the outer case lid and the inner case lid. It is desirable that the case is sandwiched between the outer case lid and the sheet pressing member.

  In this way, when the outer case lid is destroyed and the outer case is to be opened, the portion of the detection sheet sandwiched between the outer case lid and the sheet pressing member is fixed to the inner case side. It is easily cut from the remaining part of the detection sheet.

  In addition, in the circuit board sealing operation, the detection is detected between the outer case lid and the sheet pressing member as compared with the case where the detection sheet is sandwiched between the outer case portion and the sheet pressing member in the other part of the outer case. The operation of sandwiching the sheet can be easily performed through the opening of the outer case main body. Therefore, the work of assembling the detection sheet and the sheet pressing member becomes easy.

  In the present invention, when the inner case is a polyhedral case, a straight ridge line is formed between the surfaces. In this case, the detection sheet covers a plurality of surfaces of the inner case, and a portion of the detection sheet corresponding to at least one ridge line between the surfaces covered with the detection sheet It is desirable that slits are formed at predetermined intervals in the direction along the ridgeline.

  By forming a slit in the detection sheet, the detection sheet is easily cut along the slit when an external force is applied. The inner case has a polyhedral shape, generally a rectangular parallelepiped shape. In the detection sheet, the portion of the slit formed along the ridge line between each surface is pressed against the ridge line of the inner case when a force is applied from the outside, and the detection sheet is easily cut along the slit. . Thereby, an illegal act can be detected reliably. Further, since the detection sheet can be easily bent along the slit, the work of wrapping the inner case with the detection sheet is facilitated.

  In this case, it is desirable that the width of the sheet portion remaining between the adjacent slits in the direction along the ridgeline is a dimension that allows the wiring to pass therethrough.

  By narrowing the width of the detection sheet portion between the slits, the detection sheet is easily cut along the slits. In this case, the wiring passing between the slits is also reliably divided. Therefore, an illegal act can be detected reliably.

  Further, when forming the slit, the contour shape of at least one end in the direction along the ridge line in the slit is the starting point of the detection sheet cutting so that the detection sheet is surely cut along the slit. It is desirable that the wedge shape is easy to become.

  In the present invention, at least one of the outer case and the inner case may include an acute corner that is in contact with the detection sheet. Even in this case, the detection sheet is easily cut.

  In the present invention, when the inner case is a rectangular parallelepiped case, when the detection sheet is developed in a plane, the six sheet surfaces corresponding to the six surfaces of the inner case are It can be set as the sheet | seat connected through the formed crease | fold. If it does in this way, it will be easy to arrange | position in the state which wraps the whole six surfaces of the said inner case by folding the said detection sheet | seat along the said each fold on the same side. In this case, a portion of one of the six sheet surfaces of the detection sheet may be sandwiched between the outer case and the sheet pressing member. Furthermore, if the energization wiring is formed on the detection sheet with a predetermined wiring pattern that passes through the six sheet surfaces, the energization line can be obtained regardless of which portion of the sheet surface is cut. Disconnected. Therefore, even if it is attempted to illegally access the inside from any part of the outer case, such an illegal act can be reliably detected.

  In addition, the disconnection detection circuit for detecting disconnection of the detection sheet is cut off from the battery power source for supplying current to the wiring of the detection sheet mounted on the circuit board, and the wiring that is also mounted on the circuit board. It can be configured using a real-time clock that records the date and time.

  In the present invention, the electronic component mounted on the circuit board surface of the circuit board, the resin cured layer that covers the electronic component, and the resin cured layer are sandwiched and attached to the resin cured layer from the opposite side of the substrate surface And a cover member including an arrangement region of the electronic component on the substrate surface.

  In this case, the cover member is attached to the cured resin layer covering the electronic component so as to cover the arrangement area of the electronic component. Therefore, in order to access the electronic component, it is necessary to remove the cover member and the cured resin layer. Therefore, it is difficult to illegally access the electronic component as compared to the case where only the resin cured layer is removed. In addition, by appropriately setting the mechanical properties of the cover member, the bonding strength between the cover member and the cured resin layer, and the like, the cover member can be reliably destroyed when the cover member is peeled off. . Unauthorized access can be detected if there is a physical trace or proof that an attempt has been made to illegally access an electronic component by destroying the cover member.

  Here, in order to make it difficult to remove the cover member from the cured resin layer and to ensure that the cover member is destroyed when the cover member is removed from the cured resin layer, a part of the cover member is made to be the resin. It is desirable to attach to the cured resin layer in a state where it is buried in the cured layer. Thereby, the bond strength between the cover member and the cured resin layer can be increased, and the cover member is reliably destroyed when the cover member is peeled off from the cured resin layer.

  In particular, the cover member preferably includes at least one protrusion, and the protrusion is embedded in the resin cured layer.

  In this case, it is desirable that a part of the protrusion protrudes or bends in a direction different from the protrusion direction of the protrusion. If a protrusion having this shape is used, the cover member cannot be easily removed from the cured resin layer due to the anchor effect of the protrusion. Further, when the cover member is peeled off from the cured resin layer, the protrusion is first cut from the cover member main body side and remains in the cured resin layer as a trace of unauthorized access to the electronic component.

  In the present invention, the cover member may be formed of a material whose shape retention is impaired at a lower temperature than the cured resin layer, or a material whose bending strength is lower than the bond strength with the cured resin layer. desirable. In this way, when an electronic component that is destroying the cured resin layer is illegally accessed, the cover member is surely destroyed first. As a result, it is possible to reliably know that unauthorized access has been made.

  In the present invention, it is desirable to have a frame member that is disposed between the substrate surface and the cover member and surrounds the cured resin layer. By arranging a frame member on the surface of the substrate so as to surround the electronic component and filling and curing the resin here, a cured resin layer can be easily formed in a necessary region.

  In a typical sealing structure of the present invention using a frame member, a recess opening on the opposite side of the substrate surface is formed by the substrate surface and the frame member fixed to the substrate surface. The electronic component is mounted on a portion of the substrate surface that defines the bottom surface of the recess. The electronic component is obscured by the cured resin layer that fills the recess. The portion of the cured resin layer exposed from the opening of the recess is covered with the cover member attached to the cured resin layer.

  In the present invention, it is desirable that the cover member is a resin member so that the cover member can be easily destroyed when unauthorized access to the electronic component is performed.

1 is a perspective view of a fiscal printer to which the present invention is applied. The perspective view of the fiscal printer of FIG. FIG. 2 is a block diagram of the film printer of FIG. 1. The schematic sectional drawing of the fiscal module of FIG. 1, and explanatory drawing of a fraud detection mechanism. The disassembled perspective view which shows a fiscal module in the state which decomposed | disassembled the outer case. The disassembled perspective view of the inner case of the fiscal module of FIG. The perspective view of the fiscal control board of the fiscal printer of FIG. 1, and a partial exploded perspective view. The fragmentary sectional view of the sealing structure of the fiscal control board of FIG. The perspective view of the cover member and frame member which comprise the sealing structure of FIG.

  Hereinafter, embodiments of a fiscal printer to which the present invention is applied will be described with reference to the drawings.

  FIG. 1A is an external perspective view when the fiscal printer according to the present embodiment is viewed from the front side, and FIG. 1B is an external perspective view when the fiscal printer is viewed from the back side. FIG. 2 is an external perspective view of the fiscal printer viewed from the back side in a state where the fiscal module mounted on the fiscal printer is pulled out.

  The fiscal printer 1 (hereinafter referred to as “printer 1”) is an accounting printer connected to a POS terminal or the like. The printer 1 has a function of printing print information related to sales transactions on a receipt and issuing a printed receipt, and a function of storing and holding fiscal information related to sales transactions. As shown in FIG. 1, the printer 1 includes a printer main body 2 and a fiscal module 3 fixed to the bottom of the printer main body 2.

  As shown in FIG. 2, the fiscal module 3 has a rectangular parallelepiped shape, and a frame 4 is fixed thereon. The fiscal module 3 is attached to the bottom of the printer body 2 while being fixed to the frame 4. Various connectors 5 for electrically connecting the fiscal module 3 to a host computer (not shown) are attached to the fiscal module 3.

  Inside the printer main body 2, a recording paper storage unit, a recording paper transport mechanism, a print head, and the like (not shown) are mounted. The printer main body 2 includes an opening / closing lid 6 disposed on the front side of the upper surface and an opening / closing lid 7 disposed on the rear side of the upper surface. A receipt discharge port 8 extending in the printer width direction is formed between the opening / closing lid 6 and the opening / closing lid 7. A slide button 9 is disposed on the side of the receipt outlet 8. When the slide button 9 is operated, the opening / closing lid 7 is unlocked and the opening / closing lid 7 can be opened. When the opening / closing lid 7 is opened, the recording paper storage unit is exposed and the recording paper can be exchanged. When the opening / closing lid 6 is opened, the ink ribbon can be exchanged.

  FIG. 3 is a schematic block diagram showing a control system of the printer 1. The fiscal module 3 includes an EJ fiscal memory board (circuit board) 10, a printer control board (circuit board) 12, and a fiscal control board (circuit board) 13.

  The EJ fiscal memory board 10 is mounted with a data flash memory 15 in which fiscal information and print information for receipts are stored. A printer control CPU 16 for controlling each mechanism of the printer main body 2 is mounted on the printer control board 12. A fiscal control CPU 17, a program tampering confirmation CPU 18, a ROM 19 and a RAM 20, an RTC (real time clock) 21, and a backup primary battery (battery power source) 22 are mounted on the fiscal control board 13.

  The fiscal control CPU 17 performs fiscal control for writing fiscal information and printing information to the data flash memory 15 mounted on the EJ fiscal memory board 10. The program alteration confirmation CPU 18 performs alteration confirmation control for confirming that the fiscal control program for performing fiscal control has not been altered.

  Specifically, the program tampering confirmation CPU 18 compares the basic fiscal control program stored in the ROM 19 with the fiscal control program stored in the RAM 20 every time the printer 1 is activated. Further, the program alteration confirmation CPU 18 stops the printer 1 if the contents of the two control programs do not match, and puts the printer 1 into an operable state if the contents of the two control programs match. Further, when a detection sheet described later is disconnected, the operation of the printer 1 is stopped.

  The RTC 21 has a function for recording the date and time of occurrence of tampering with the stored fiscal information and the print information on the receipt. The primary battery 22 is connected to various electronic components (not shown) such as RTC 21 and SRAM that need to be supplied with backup power. In addition, energization is performed from the primary battery 22 to a detection sheet described later built in the fiscal module 3.

  FIG. 4A is a schematic cross-sectional view of the fiscal module 3, and FIG. 4B is an explanatory diagram illustrating a fraud detection mechanism provided in the fiscal module 3.

  First, referring to FIG. 4A, the fiscal module 3 includes a rectangular parallelepiped inner case 32, a detection sheet 33 that wraps the inner case 32, and an inner case 32 that is wrapped by the detection sheet 33. A stored plastic outer case 34 and a sheet pressing plate (sheet pressing member) 35 are provided.

  The inner case 32 is made of metal. The inner case 32 accommodates the EJ fiscal memory board 10, the printer control board 12, and the fiscal control board 13 therein. A data flash memory 15 and the like are mounted on the EJ fiscal memory board 10. A printer control CPU 16 and the like are mounted on the printer control board 12. The fiscal control board 13 has a board surface 13a facing downward, and a fiscal control CPU 17, a program tampering confirmation CPU 18, a ROM 19 and a RAM 20 are mounted on the board surface 13a.

  Here, the EJ fiscal memory substrate 10 is provided with a sealing portion 25 for sealing the circuit element group 24 including the data flash memory (electronic component) 15. The fiscal control board 13 is provided with a sealing portion 27 for sealing a circuit element group 26 including a program alteration confirmation CPU (electronic component) 18, ROM (electronic component) 19, and RAM (electronic component) 20. The sealing portions 25 and 27 each include a resin cured layer 28, a cover member 29, and a frame member 30. The specific configuration of the sealing portions 25 and 27 will be described later.

  The outer case 34 includes a rectangular parallelepiped outer case body 36 having a rectangular opening that opens upward, and an outer case lid 37 that is fixed to the outer case body 36 with an adhesive or the like and seals the opening. Prepare. The sheet pressing plate 35 is disposed between the outer case lid 37 and the rectangular upper surface 32a of the inner case 32 opposite to the outer case lid 37. In addition, a rectangular sheet upper surface portion 33 a of the detection sheet 33 is sandwiched between the outer case lid 37 and the sheet pressing plate 35. The sheet pressing plate 35 is formed with a plurality of circular protrusions 35 a extending from the upper surface thereof through the sheet upper surface portion 33 a to the outer case lid 37. These circular protrusions 35a are joined to the outer case lid 37 by an adhesive, for example.

  The detection sheet 33 is joined to the bottom plate portion 36a of the outer case main body 36 by an adhesive or the like at the center portion of the sheet bottom surface portion 33b. Further, the four side surface portions 33c of the detection sheet 33 are respectively corresponding to the corresponding four side plate portions of the inner case 32 (only the two side surfaces 32c and 32d are shown in the drawing) in the central portion in the vertical direction. Bonded with an adhesive or the like. In FIG. 4 (a), the joints are indicated by dotted circles.

  Referring to FIG. 4B, the fraud detection mechanism 40 that detects fraudulent acts on the fiscal module 3 includes a detection sheet 33 and a disconnection detection circuit 41 mounted on the fiscal control board 13. Similar to a general flexible printed wiring board, the detection sheet 33 includes a continuous line 42 for energization that does not have a branch point or an intersection on the surface of a multilayer base material of a plastic sheet. The wirings 42 are formed at a narrow pitch in accordance with a continuous wiring pattern having no branching points or intersections on the way, and the surfaces thereof are covered with an insulating layer.

  Slits 43 are formed at regular intervals along the ridge lines at portions corresponding to the ridge lines between the surfaces of the inner case 32 in the detection sheet 33, so that cutting is easy. An end 43a in the length direction of the slit 43 has a contour shape in which the portion is likely to be a starting point of cutting. For example, it has an acute wedge shape. The width H of the sheet portion between the slits in the arrangement direction of the slits 43 is formed as narrow as possible, and the minimum width is a width through which at least one wiring 42 can pass. The arrangement pattern of the wirings 42 is set so that at least one wiring is always drawn through the portion connecting the slits.

  When the outer case lid 37 of the outer case 34 is destroyed by an illegal act and is forcibly separated from the outer case main body 36 and removed, the sheet pressing plate 35 joined to the back surface of the outer case lid 37. The sheet upper surface portion 33a sandwiched between the two is also pulled together. As a result, the detection sheet 33 with the slit 43 and the cutting strength weakened is easily broken, and the portion of the wiring 42 passing through the broken portion is broken.

  The disconnection detection circuit 41 of the fraud detection mechanism 40 is a circuit using an RTC (clock IC) 21 that is backed up by a primary battery 22 built in the fiscal module 3. Even when the power to the fiscal module 3 is not turned on, the disconnection of the wiring 42 can be detected and recorded. The end 42a of one wiring 42 is connected to the event terminal 21a of the RTC 21 mounted on the fiscal control board 13. When disconnection occurs, an event (occurrence of disconnection due to fraud) is recorded in the internal memory 21b of the RTC 21. For example, the logic level of the event terminal 21a at the normal time (a state in which no disconnection has occurred) is “Low”, and when the disconnection occurs due to an illegal act, the logic level is switched to “High”. When the power of the fiscal printer 1 is turned on after an illegal act is performed, if the disconnection record is confirmed by the firmware of the fiscal control CPU 17, the subsequent operation is forcibly stopped.

(Specific configuration of fiscal module and detection sheet)
Next, specific configurations of the fiscal module 3 and the detection sheet 11 will be described with reference to FIGS. 5 and 6. FIG. 5 is an exploded perspective view showing the fiscal module 3 with the outer case 34 disassembled, and FIG. 6 is an exploded perspective view of the inner case 32 of the fiscal module 3. For convenience of explanation, X, Y, and Z shown in FIGS. 5 and 6 are described as the width direction, the front-rear direction, and the vertical direction of the fiscal module 3, respectively.

  As shown in FIG. 5, the outer case 34 is a resin case having a rectangular parallelepiped shape. The outer case main body 36 in which a rectangular opening opening upward is formed, and the opening of the outer case main body 36 is sealed. A rectangular outer case lid 37 attached to the outer case main body 36 is provided. The outer case lid 37 is fixed to the outer case main body 36 in a snap-fit manner by four engaging claws 37a formed at the edges on both sides in the width direction X.

  The inner case 32 housed in the outer case 34 is a metal case having a rectangular parallelepiped shape that is slightly smaller than the outer case 34. As will be described later, the inner case 32 is wrapped by a single detection sheet 33 with a sheet pressing plate 35 laminated on the upper surface thereof. The inner case 32 wrapped in the detection sheet 33 is housed in the outer case body 36 from the upper side, and is fixed to the outer case body 36 by bolts 38 attached to the four corners. From above, the outer case lid 37 is fixed to the outer case body 36 in a state in which the opening of the outer case body 36 is sealed.

  As shown in FIG. 6, the inner case 32 includes a rectangular parallelepiped inner case main body 32A formed with a rectangular opening that opens upward, and the inner case main body 32A in a state of sealing the opening of the inner case main body 32A. And an inner case lid 32B fixed to the inner case. The four corners of the inner case lid 32B are fastened and fixed to the inner case main body 32A by bolts 39. The inner case 32 includes six surfaces including an upper surface 32a, a bottom surface 32b, front and rear side surfaces 32c and 32d, and left and right side surfaces 32e and 32f.

  The inner case 32 houses the EJ fiscal memory board 10, the printer control board 12, and the fiscal control board 13 in a state where the mounted components are sealed with epoxy resin. External connection connectors 51 and 52 mounted on the fiscal control board 13 project outward from openings 53 and 54 formed in the upper surface 32a and the front side surface 32c of the inner case 32, respectively. The outer case 34 is also provided with connector openings 37c and 37d at corresponding portions. A plurality of openings 55 for external connection are formed on the side surface 32d on the rear side of the inner case 32. On the upper surface 32 a of the inner case 32, columnar protrusions 56 that protrude upward by the same amount are formed at a plurality of locations.

  As shown in FIGS. 5 and 6, a rectangular sheet pressing plate 35 having a size corresponding to the upper surface 32 a is laminated on the upper surface 32 a of the inner case 32. A circular through hole 35 b is formed in the sheet pressing plate 35 at a portion corresponding to the protrusion 56 on the upper surface 32 a of the inner case 32. The sheet pressing plate 35 is stacked on the upper surface 32a of the inner case 32 with the protrusion 56 passing through the through hole 35b. On the four peripheral edges of the upper surface of the sheet pressing plate 35, circular protrusions 35a protruding upward by a certain amount are formed. Further, a connector opening 35c is also formed.

  As shown in FIG. 6, when the detection sheet 33 enveloping the inner case 32 is unfolded on a plane, the six sheet surfaces corresponding to the six surfaces of the inner case 32 pass through the crease in which slits are formed. Connected. That is, the detection sheet 33 includes a sheet upper surface portion 33a corresponding to the upper surface 32a of the inner case 32, a sheet side surface portion 33e corresponding to the left side surface 32e of the inner case 32, and a sheet bottom surface portion 33b corresponding to the bottom surface 32b of the inner case 32. A seat side surface portion 33f corresponding to the right side surface 32f of the inner case 32, a seat side surface portion 33c corresponding to the front side surface 32c of the inner case 32, and a seat side surface portion corresponding to the rear side surface 32d of the inner case 32. 33d.

  Between the sheet upper surface portion 33a, the sheet side surface portion 33e, the sheet bottom surface portion 33b, and the sheet side surface portion 33f are bent portions defined by a plurality of slits 43 formed at regular intervals in the front-rear direction Y. Further, on both sides of the seat bottom surface portion 33b in the front-rear direction Y, a seat side surface portion 33c and a seat side surface portion 33d are connected. Between the sheet bottom plate portion 33b and each of the sheet side plate portion 33c and the sheet side surface portion 33d, there are bent portions defined by a plurality of slits 43 formed at regular intervals in the width direction X.

  Further, in the sheet upper surface portion 33a, three sides other than the side connected to the sheet side surface portion 33e are narrow via a bent portion defined by a plurality of slits 43 formed at a constant interval in the width direction X. The extended portions 33g, 33h and 33i are connected. These are portions for wrapping the inner case 32 so that there is no gap between the sheet bottom surface portion 33b and each of the three sheet side surface portions 33c, 33e, and 33f. Similarly, the sheet side surface portions 33 c and 33 d are also wider than the side surfaces 32 c and 32 d of the inner case 32. This prevents a gap from being formed between the sheet side surface portion 33c and each of the sheet side surface portions 33e and 33f, and prevents a gap from being formed between the sheet side surface portion 33d and each of the sheet side surface portions 33e and 33f. ing. The detection sheet 33 is also formed with a connector opening 33j and a notch 33k.

  Here, the minimum width of the interval H between the slits 43 is a width through which at least one wiring 42 passes. Further, the end 43a of the slit 43 has a pointed wedge shape so that the detection sheet 33 is easily torn as a starting point of cutting. Further, in the wiring pattern of the energization wirings 42 formed on the detection sheet 33, the wirings 42 are densely arranged on all six surfaces (33 a to 33 f) of the detection sheet 33, and At least one wiring 42 passes through the gap.

  As shown in FIG. 6, the detection sheet 33 having this configuration has a bottom surface 32 b of the inner case 32 placed on the sheet bottom surface portion 33 b in a state where the detection sheet 33 is flattened and bends each bent portion inward at a right angle. Each bent portion is defined by a slit 43 arranged in a direction along each ridge line at a portion corresponding to each ridge line between each surface of the inner case 32. Therefore, by bending each bent portion, as shown in FIG. 5, the inner case 32 wrapped by the detection sheet 33 can be easily obtained. The four side surface portions 33c to 33f of the detection sheet 33 are adhesively fixed to the side surfaces 32c to 33f of the inner case 32, respectively.

  Further, the sheet upper surface portion 33 a of the detection sheet 33 is disposed so as to cover the sheet pressing plate 35 placed on the upper surface 32 a of the inner case 32. A circular through hole 58 through which the projection 56 of the inner case 32 passes and a circular through hole 59 through which the circular protrusion 35a of the sheet pressing plate 35 penetrates are formed in the sheet upper surface portion 33a. By passing the protrusion 56 and the circular protrusion 35a through the through holes 58 and 59, the sheet upper surface portion 33a covers the upper surface of the sheet pressing plate 35 in a positioned state.

  As described above, the inner case 32 and the sheet pressing plate 35 wrapped with the detection sheet 33 are accommodated in the outer case main body 36 of the outer case 34 and fixed to the outer case main body 36 with bolts 38 as shown in FIG. The Thereafter, the outer case lid 37 is put on and fixed to the outer case main body 36. Here, the circular protrusion 35a and the outer case lid 37 exposed upward from the through hole 59 of the sheet upper surface portion 33a of the detection sheet 33 are bonded and fixed to each other. As a result, the sheet upper surface portion 33 a of the detection sheet 33 is stored in the outer case 34 while being sandwiched between the outer case lid 37 and the sheet pressing plate 35. The outer case lid 37 is formed with a positioning hole 37b into which the projection 56 is fitted. The outer case lid 37 is positioned in the outer case main body 36 in a state of being positioned with respect to the inner case 32 and the outer case main body 36. Fixed.

(Specific configuration of the sealing part)
Next, the sealing portion 27 of the circuit element group 26 in the fiscal control board 13 will be described with reference to FIGS. 4, 7, 8, and 9. 7 (a) is a schematic perspective view showing the fiscal control board 13, FIG. 7 (b) is a partially exploded perspective view of the sealing portion 27 with the cover member 29 removed, and FIG. 7 (c) is the sealing. FIG. 4 is a partially exploded perspective view of a portion 27 with a cover member 29 and a frame member 30 removed. FIG. 8 is a schematic sectional view of the sealing portion. 9A and 9B are perspective views when the cover member 29 is viewed from the front surface side and the back surface side, respectively, and FIGS. 9C and 9D respectively illustrate the frame member 30 as the front surface side and FIG. It is the perspective view at the time of seeing from a back surface side, and the perspective view of a back surface side. Since the sealing part 27 is formed with the substrate surface 13a of the fiscal control board 13 facing upward, in FIGS. 7 to 9 referred to in the description of the sealing part 27, the fiscal control board 13 is shown in FIG. And it has shown as the state upside down from the state shown in FIG. Moreover, since the sealing part 25 (refer FIG. 6) in the EJ fiscal memory board | substrate 10 is provided with the structure similar to the sealing part 27, the sealing part 27 is demonstrated and the description is abbreviate | omitted.

  As can be seen from FIG. 7B, a circuit element group 26 including a CPU 18 for program alteration confirmation, a ROM 19 and a RAM 20 is mounted on the fiscal control board 13, and the circuit element group 26 is sealed by a sealing structure to which the present invention is applied. The sealed portion 27 is made. As shown in FIG. 7C, the sealing portion 27 includes a resin cured layer 28 that covers the circuit element group 26 mounted on the substrate surface 13a of the fiscal control board 13, a cover member 29, and a frame member 30. I have.

  As can be seen from FIGS. 7 and 8, the frame member 30 is rectangular and is a metal or resin member. The frame member 30 is fixed to the substrate surface 13 a by an adhesive so as to surround the circuit element group 26. Thus, the substrate surface 13a and the frame member 30 form a recess 65 that opens above the substrate surface opposite to the substrate surface 13a, and a circuit element group is formed on the portion of the substrate surface 13a that defines the bottom surface of the recess 65. 26 is located.

  The cured resin layer 28 is formed so as to completely fill the recess 65, and the circuit element group 26 is completely covered. The cured resin layer 28 is a layer formed, for example, by curing an epoxy resin poured into the recess 65 in a molten state. As the resin cured layer 28, it is possible to use a resin other than an epoxy resin.

  The cover member 29 is a rectangular plate member made of metal or resin. The cover member 29 is attached to the end face 30a of the rectangular frame shape opposite to the substrate surface 13a in the frame member 30 in a state of completely covering the resin cured layer 28 exposed from the opening of the recess 65. The cover member 29 is attached and fixed to the surface of the cured resin layer 28 by being attached before the resin filled in the recess 65 is cured. In this way, the cover member 29 attached to the resin cured layer 28 from the opposite side of the substrate surface 13a with the resin cured layer 28 interposed therebetween is viewed on the substrate surface 13a when viewed from a direction orthogonal to the substrate surface 13a. The arrangement area of the circuit element group 26 is included.

  As can be seen from FIG. 8, two protrusions 66 and 67 are integrally formed on the cover member 29. The cover member 29 is bonded and fixed to the cured resin layer 28 with the protrusions 66 and 67 buried in the cured resin layer 28. As can be seen from FIG. 8, the protrusions 66 and 67 protrude perpendicularly from the back surface 29a of the cover member 29 facing the resin cured layer 28 toward the substrate surface 13a. Further, the tip portions 66a and 67a on the substrate surface 13a side of these protrusions 66 and 67 are bent in a direction different from the protruding direction, in this example, at a right angle.

  The structure of the frame member 30 and the cover member 29 will be described in more detail with reference to FIG. The frame member 30 is a frame member having a rectangular cross section with a rectangular outline having a size capable of including the circuit element group 26 to be sealed. The rectangular frame-shaped end surface 30b bonded and fixed to the substrate surface 13a of the frame member 30 is a flat surface, and the opposite rectangular frame-shaped end surface 30a is a step-shaped end surface whose inner peripheral side is one step lower. Yes. Further, one corner of the end face 30a having a rectangular frame shape is a positioning corner 30c.

  The cover member 29 is a plate member having a constant thickness and having a rectangular outline as a whole, and includes a stepped outer peripheral end surface 29 b corresponding to the rectangular frame end surface 30 a on the upper side of the frame member 30. Further, a positioning corner portion 29 c corresponding to the corner portion 30 c of the frame member 30 is provided. Therefore, the cover member 29 can be easily positioned and attached to the frame member 30 fixed to the substrate surface 13a.

  On the back surface 29a of the cover member 29, protrusions 66 and 67 extending in parallel at a constant interval are formed. One projection 66 is formed with a tip portion 66a that is bent at a right angle to the central portion in the lengthwise direction and extends. The other protrusion 67 is formed with a pair of tip end portions 67a that are bent at right angles in the same direction and extend at both ends in the length direction. The tip portion 66a and the pair of tip portions 67a are bent in directions away from each other. The number and shape of the protrusions 66 and 67 may be different from the number and shape shown in the drawing, and the bending directions of the tip portions may be different directions.

  In the sealing portion 27 having this configuration, the cured resin layer 28 is covered with a cover member 29 and a frame member 30. In order to remove the resin cured layer 28, it is necessary to destroy the cover member 29. Since the protrusions 66 and 67 of the cover member 29 are buried and fixed in the cured resin layer 28, it is difficult to remove the cover member 29 from the cured resin layer 28. Therefore, unauthorized access to the circuit element group 26 is extremely difficult.

  When the cover member 29 is forcibly removed from the cured resin layer 28, the protrusions 66 and 67 are cut off from the base portion of the back surface 29 a of the cover member 29 and remain in the cured resin layer 28. Therefore, there remains a trace that unauthorized access has been made to the circuit element group 26. In addition, when the cover member 29 and the resin cured layer 28 are destroyed and the circuit element group 26 is illegally accessed, even if the circuit element group 26 is sealed again with the resin cured layer 28, the broken cover member 29 is removed. It cannot be attached and it is extremely difficult to return to the original sealing portion 27. Therefore, unauthorized access can be known with certainty.

  Further, when a member made of a material that is inferior in shape retention property by heating as compared to the cured resin layer 28 is used as the cover member 29, the cover member 29 is first destroyed when the cured resin layer 28 is heated and peeled off. The Similarly, when the bending strength of the cover member is lower than the bonding strength between the cover member 29 and the resin cured layer 28, the cover member 29 is reliably destroyed before the cover member 29 is peeled off from the resin cured layer 28. The

(Other embodiments)
In addition to the detection sheet 33, another detection sheet can be arranged inside the inner case 32. For example, in FIG. 4A, the detection sheet 33 </ b> A can be arranged at a portion corresponding to the opening 55 provided in the inner case 32 for arranging the connector 5. In this way, the detection sheet 33A can be broken when it is illegally accessed from the outside through the opening 55 for the connector 5.

  In the above example, the entire inner case is wrapped with the detection sheet. However, only a part of the inner case can be wrapped with the detection sheet. Further, although a part of the detection sheet is sandwiched between the sheet pressing plate and the outer case lid, it is also possible to sandwich the detection sheet between the sheet pressing plate and a portion other than the outer case lid in the outer case. . Furthermore, various patterns can be adopted as the wiring pattern formed on the detection sheet.

1 .... Printer (Fiscal printer) 2. Printer body 3. Fiscal module 4. Frame 5. Connector 6. Open / close lid 7. Open / close lid 8. Receipt outlet 9 .... Slide button, 10 .... EJ Fiscal memory board (circuit board), 11 .... Detection sheet, 12 .... Printer control board (circuit board), 13 .... Fiscal control board (circuit board), 13a ... Board Front side, 15 ... Data flash memory, 16 ... Printer control CPU, 17 ... Fiscal control CPU, 18 ... Program tampering confirmation CPU, 21 ... RTC, 21a ... Event terminal, 21b ... Built-in Memory, 22 .... Primary battery (battery power supply), 24 .... Circuit element group, 25.27..Sealed part, 26..Circuit element group, 28 · Resin hardened layer, 29 · · Cover member, 29a · · Back surface of cover member, 29b · · Outer end surface of cover member, 29c · · Corner portion of cover member, 30 · · Frame member, 30a · 30b · · Frame member End face, 30c ... corner part of frame member, 32 ... inner case, 32A ... inner case main body, 32B ... inner case lid, 32a ... top face, 32b ... bottom face, 32c-32f ... side face, 33 .33A..Detection sheet, 33a..Sheet upper surface portion, 33b..Sheet bottom surface portion, 33c to 33f..Sheet side surface portion, 33g to 33i..Extension portion, 33j. , 34 .. Outer case, 35 .. Sheet pressing plate (sheet pressing member), 35 a .. Circular protrusion, 35 b .. Through hole, 35 c .. Opening, 36 .. Outer case body, 36 a. , 37 ... Case lid, 37a ... engaging claw, 37b ... hole, 37c ... opening, 38 ... 39 ... bolt, 40 ... fraud detection mechanism, 41 ... open circuit detection circuit, 42a ... end, 42 ... Wiring, 43 ·· Slit, 43a ·· Slit end, 51 · 52 ·· Connector, 53 · 54 · 55 ·· Opening portion, 56 ·· Protrusion, 58 · 59 ·· Through hole, 65 ·· Recess, 66 ..Protrusions, 66a, tip portions, 67, projections, 67a, tip portions

Claims (16)

An inner case in which the circuit board is stored;
An outer case in which the inner case is stored;
A detection sheet disposed between the outer case and the inner case, at least partially fixed to the inner case, and including a continuous line of energization wiring that does not have a branch point and an intersection in the middle;
A sheet pressing member disposed between the outer case and the inner case, and sandwiching at least a part of the detection sheet between the outer case;
A fiscal printer characterized by comprising: The outer case includes an outer case main body and an outer case lid that seals an opening of the outer case main body,
The fiscal printer according to claim 1, wherein the detection sheet is sandwiched between the outer case lid and the sheet pressing member at least between the outer case lid and the inner case. The inner case is a polyhedral case,
The detection sheet covers a plurality of surfaces of the inner case,
In the detection sheet, slits are formed at a predetermined interval in a direction along the ridge line in a portion corresponding to at least one ridge line between the surfaces covered with the detection sheet. The fiscal printer according to claim 2.   4. The fiscal printer according to claim 3, wherein the width of the sheet portion remaining between the adjacent slits in the direction along the ridgeline is a dimension that allows the wiring to pass therethrough. 5.   5. The fiscal printer according to claim 3, wherein at least one end of the slit in a direction along the ridgeline has a wedge-shaped outline. 6.   6. The fiscal printer according to claim 1, wherein at least one of the outer case and the inner case includes an acute corner that contacts the detection sheet. The inner case is a rectangular parallelepiped case,
The detection sheet is a sheet in which six sheet surfaces corresponding to each of the six surfaces of the inner case are connected via a crease in which the slit is formed, when the detection sheet is spread on a plane.
The detection sheet wraps around the six surfaces of the inner case by folding it on the same side along each of the folds,
A portion of one of the six sheet surfaces in the detection sheet is sandwiched between the outer case and the sheet pressing member,
5. The fiscal printer according to claim 3, wherein the energization wiring is formed on the detection sheet in a predetermined wiring pattern that passes through the six sheet surfaces. 6.   8. The circuit board is mounted with a battery power source for supplying current to the wiring of the detection sheet, and a real-time clock for recording the date and time when the energization of the wiring is cut off. A fiscal printer according to any one of the above. Electronic components mounted on the substrate surface of the circuit board;
A cured resin layer that covers the electronic component;
A cover member sandwiching the resin cured layer, attached to the resin cured layer from the opposite side of the substrate surface, and including a placement region of the electronic component on the substrate surface;
The fiscal printer according to claim 1, wherein the fiscal printer is provided.   The fiscal printer according to claim 9, wherein a part of the cover member is embedded in the cured resin layer. The cover member includes at least one protrusion,
The fiscal printer according to claim 10, wherein the protrusion is embedded in the cured resin layer.   The fiscal printer according to claim 11, wherein a part of the protrusion protrudes or bends in a direction different from a protruding direction of the protrusion.   The cover member is formed of a material whose shape retention is impaired at a temperature lower than that of the cured resin layer, or a material having a bending strength lower than the bond strength with the cured resin layer. The fiscal printer according to any one of claims 9 to 12.   The fiscal printer according to any one of claims 9 to 13, further comprising a frame member disposed between the substrate surface and the cover member and surrounding the resin cured layer. The substrate surface and the frame member fixed to the substrate surface form a recess that opens to the opposite side of the substrate surface,
The electronic component is mounted on a portion of the substrate surface that defines the bottom surface of the recess,
The electronic component is obscured by the cured resin layer filling the recess,
The fiscal printer according to claim 14, wherein a portion of the cured resin layer exposed from the opening of the recess is covered with the cover member attached to the cured resin layer.   The fiscal printer according to claim 9, wherein the cover member is a resin member.