JP6475547B2 - Storage device for memory elements - Google Patents

Description

  The present invention relates to a storage device for a memory element that can prevent stored data of a semiconductor memory element such as a USB memory or an SD card being stored from being inadvertently leaked to an outsider.

  A storage device for safely protecting recorded data of magnetic recording articles such as a magnetic tape being stored has been proposed (Patent Document 1).

  A conventional storage device is constructed by incorporating a demagnetizer into a storage case with a lockable door. The magnetic storage device is stored in the storage case, and the door is closed and locked to secure the magnetic recording device. Can be stored in. The degausser is activated in the event of an anomaly such as destructive activity from the outside, generating a demagnetizing magnetic flux in the storage case, and magnetically erasing the recorded data of the magnetic recording supplies being stored, thereby recording the recorded data. Can be prevented from leaking.

Japanese Patent Laid-Open No. 11-193084

  In such a conventional technique, the magnetic flux from the demagnetizer is not effective for erasing data stored in a semiconductor memory device such as a USB memory or an SD card, even if it is effective for erasing data recorded in a magnetic recording article. There is a problem that it is appropriate and cannot be applied to a semiconductor memory device.

  SUMMARY OF THE INVENTION Accordingly, in view of the problems of the prior art, the object of the present invention is to incorporate memory element slots and a high voltage generation circuit into a case with a lid, thereby leaking data stored in the semiconductor memory element to an outsider. An object of the present invention is to provide a storage device for a memory device that can effectively prevent this.

  The configuration of the present invention for achieving such an object includes a case with a lockable lid, a plurality of slots for memory elements installed in the case, a microcomputer housed in the case, and a high voltage generation circuit. The microcomputer operates the high voltage generation circuit when the locked lid is opened without inputting a predetermined authentication code, and supplies the high voltage from the high voltage generation circuit to each slot. The gist is to electrically destroy a plurality of memory elements at once.

  Note that the microcomputer operates the high voltage generation circuit to electrically destroy the memory element in the slot when the case whose lid is locked is lifted from the predetermined installation surface without inputting the predetermined authentication code. can do.

  Further, the slot may include at least one for a USB memory or an SD card.

  Further, the microcomputer may be combined with a microcomputer on the lid side, and a numeric keypad for inputting an authentication code and a display mounted on the surface of the lid may be connected to the microcomputer on the lid side.

  According to the configuration of the invention, a memory element can be detachably attached to the slot in the case, and the memory element on the slot can be safely stored by closing the case lid and locking it. Can do. On the other hand, when the locked lid is opened without entering a predetermined authentication code, the microcomputer determines that an unauthorized attack has been performed and activates the high voltage generation circuit. By applying a voltage to the memory element on the slot, it is possible to electrically destroy the memory element and effectively prevent leakage of stored data in the memory element. Note that the memory element here means a semiconductor memory element including one or both of a USB memory and an SD card, and the predetermined authentication code is, for example, a code number combining arbitrary numbers, arbitrary characters, numbers, A password that combines symbols.

  Even if the case with the lid locked up is lifted without entering the predetermined authentication code, the microcomputer determines that the internal memory element is taken away with the case, for example, and the high voltage The memory element on the slot can be electrically destroyed by the high voltage from the generation circuit to prevent leakage of stored data.

  The slot installed in the case can correspond to these memory elements that are most commonly used by including at least one for USB memory and one for SD card. It is assumed that one or more slots for USB memory and SD card may be prepared for any number of memory elements.

  By combining the microcomputer with the microcomputer on the lid side, the overall configuration can be simplified by reducing the number of signal lines for connecting the lid side and the case side. However, each microcomputer is supplied with power from an individual power source such as a battery.

  By connecting a numeric keypad, a display, etc. mounted on the surface of the lid to the lid side microcomputer, the interface with the case side microcomputer can be most simplified.

Overall block diagram Overall configuration perspective view (1) Overall configuration perspective view (2) Overall configuration sectional view (1) Overall configuration cross section (2) Operation explanatory diagram (1) Operation explanatory diagram (2) Program flow chart Principal part program flowchart showing another embodiment Main part explanatory drawing which shows other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The storage device for a memory element includes a case 11 with a lockable lid 12, a microcomputer 21 housed in the case 11, and a high voltage generation circuit 22 (FIGS. 1 and 2).

  The case 11 can be detachably installed on a fixed installation base 13. Further, the microcomputer 21 is combined with the microcomputer 23 on the lid 12 side. In the case 11, slots S1, S1... For the USB memory M1, and slots S2, S2. (FIGS. 3 and 4).

  The slots S1, S1,..., S2, S2... Are fixed on a horizontal partition plate 11a in the case 11. A printed circuit board 11b is incorporated under the partition plate 11a. Upward and downward limit switches LS1 and LS2 are incorporated on the front end side of the case 11 and the lower side of the printed circuit board 11b, respectively. However, the limit switch LS 1 can detect the opening of the lid 12 corresponding to the dog 14 a on the front end side of the lid 12, and the limit switch LS 2 corresponds to the dog 13 a on the installation table 13. It can be detected that the case 11 is separated from the surface of the

  The lid 12 is attached to the rear end of the case 11 via a hinge 12a so as to be freely opened and closed. On the front end side of the lid 12, a dog 14a for the limit switch LS1 and a latch receiver 14b with a hole 14c for locking the lid 12 are provided via a horizontally long bar-shaped guard member 14. A solenoid 15 is incorporated in the front end of the case 11 (FIG. 5), and the plunger 15a of the solenoid 15 faces the hole 14c of the latch receiver 14b of the fully closed lid 12. Therefore, when the solenoid 15 is driven to advance the plunger 15a, the plunger 15a enters the hole 14c and can lock the lid 12 so that it cannot be opened.

  In the case 11, batteries B, B... Are housed in a battery space 16 with a lid as a power source for the microcomputer 21 and the high voltage generation circuit 22 (FIGS. 3 and 5). However, in FIG. 1, the batteries B, B... Are shown as a single battery B for convenience.

  A battery space 17 with a lid for accommodating a battery (not shown) for the microcomputer 23 is formed on the surface of the lid 12 (FIG. 2). In addition to the keys K, K... For inputting the authentication code, a liquid crystal display 24 is mounted on the surface of the lid 12. The keys K, K... Are connected to the microcomputer 23 as a numeric key 23a (FIG. 1), and the display 24 displays an authentication code input by the numeric key 23a through the microcomputer 23 for each digit. be able to.

  The microcomputers 21 and 23 are bidirectionally connected via a data bus 25 having a connector 25a. In addition to the EPROM 26, a solenoid 15 and limit switches LS1 and LS2 are connected to the microcomputer 21 on the case 11 side. The solenoid 15 is attached with a limit switch LS3 indicating the locked state and unlocked state of the lid 12 by the forward and backward movement of the plunger 15a, and the limit switch LS3 is also connected to the microcomputer 21. The battery B is backed up via a power supply circuit 27 connected to the commercial power supply AC, and the high voltage generation circuit 22 is supplied with power from the battery B via a relay contact 21 a driven by the microcomputer 21. The output of the high voltage generation circuit 22 is branched and connected to the slots S1, S1,..., S2, S2... For the USB memory M1 and the SD card M2.

  The microcomputer 21 can unlock the lid 12 in a fully closed and locked state by retracting the plunger 15a of the solenoid 15 and removing it from the hole 14c of the latch receiver 14b (FIG. 6). The limit switch LS3 attached to the solenoid 15 can detect the locked state and the unlocked state of the lid 12.

  On the other hand, when the fully-closed lid 12 is slightly opened (FIG. 7), it can be detected by the limit switch LS1, and when the case 11 is lifted from the surface of the predetermined installation base 13, it is detected by the limit switch LS2. be able to. The guard member 14 on the front end side of the lid 12 can prevent unauthorized access to the inside of the case 11 through the gap d between the lid 12 and the case 11. Further, in order to detect the rising of the case 11 by the limit switch LS2, a through hole 11c is formed on the bottom surface of the case 11 so that the dog 13a on the installation base 13 faces the limit switch LS2.

  If the USB memory M1 and the SD card M2 are respectively attached to the slots S1 and S2 in the case 11 and the lid 12 is closed, the solenoid 15 is driven to lock the lid 12, and the internal USB memory M1 and SD card M2 are connected. It can be stored safely. At this time, the case 11 is set on a predetermined installation base 13. However, the numbers of the USB memory M1 and the SD card M2 stored in the case 11 are arbitrary regardless of the illustration.

  On the other hand, when the authentication code is input by operating the keys K, K... Of the numeric keypad 23a on the lid 12, the microcomputer 23 on the lid 12 side displays the input authentication code on the display 24 and the data bus 25. To the microcomputer 21 on the case 11 side. Therefore, when the lid 12 is not locked and the microcomputer 21 is in the unlocked state, the microcomputer 21 stores the authentication code from the microcomputer 23 in the EPROM 26 and registers the information registered in the microcomputer 23. The microcomputer 23 deletes the authentication code on the display 24. Thereafter, the microcomputer 21 operates according to the program flowchart of FIG. 8, for example.

  When the program first confirms that the lid 12 is in the unlocked state (program step (1) in FIG. 8, hereinafter referred to simply as (1)), whether or not the lid 12 is opened by the limit switch LS1. (2), and if the lid 12 is open, wait for it to close ((2), (1), (2)). Thereafter, when the lid 12 is closed (2), for example, after a predetermined waiting time of about 3 seconds (3), the lid 12 is locked by driving the solenoid 15 (4). During the predetermined waiting time, the program steps (1) and (2) are continuously checked ((3), (1), (2) and (3)). When the lid 12 is changed from the unlocked state to the locked state by the locking operation of the program step (4) (1), the program then repeatedly executes the checks after the program step (5) ((1), (5 ) ... (7), (1)). Therefore, at this time, the USB memory M1 and the SD card M2 in the case 11 can be safely stored.

  On the other hand, when the authentication code is input via the numeric keypad 23a during storage of the USB memory M1 and the SD card M2 and transferred from the microcomputer 23 to the microcomputer 21, the program detects it (7) and is input. The authentication code is compared with the authentication code registered in the EPROM 26 and it is confirmed that the input authentication code is a predetermined regular one (8). If the input authentication code is valid (8), the program drives the solenoid 15 to unlock the lid 12 (9), and then opens the lid 12 to open the inside of the case 11. The required USB memory M1 and SD card M2 can be taken out. If the input authentication code is not authentic (8), the process returns to the check routine of the original program steps (1), (5) to (7), (1). When the lid 12 is unlocked (9), the program shifts to a check routine of program steps (1), (2), and (1).

  Next, during the execution of the check routines of program steps (1), (5) to (7), (1), the lid 12 can be opened without entering a predetermined authentication code (5), and the case 11 For example, when the user floats from a predetermined installation surface corresponding to the surface of the installation table 13 (6), the program executes the program step (10). That is, the microcomputer 21 closes the relay contact 21a and operates the high voltage generating circuit 22 by the battery B, and supplies the high voltage from the high voltage generating circuit 22 to the slots S1, S1,..., S2,. The USB memory M1 and the SD card M2 on the slots S1 and S2 can be electrically destroyed. The determination of program steps (5) and (6) depends on the operating state of limit switches LS1 and LS2.

Other embodiments

  In the program step (6) of FIG. 8, if the case 11 is lifted from the surface of the installation table 13 while the lid 12 is locked without inputting a predetermined authentication code, the USB memory M1 and the SD card in the case 11 Instead of immediately destroying M2 electrically, for example, the destruction process can be executed after waiting for a predetermined time of about 6 seconds (program steps (6), (11), (14) in FIG. 9). , (15), (10), hereinafter simply referred to as (6), etc.). However, program steps (5), (6), and (10) in FIG. 9 correspond to program steps (5), (6), and (10) in FIG. 8, respectively.

  It should be noted that during the period from when the case 11 floats until the lapse of a predetermined time ((6), (11), (14), (15), (6)), when a regular authentication code is input ((11 ), (12)), the solenoid 15 is driven to unlock the lid 12 (13), and thereafter, the program returns to the regular check routine of the program steps (1), (2), (1) in FIG. . If the lid 12 is opened before the predetermined time elapses (14), the destruction process of the USB memory M1 and the SD card M2 is immediately executed (10). However, when the rising of the case 11 is repaired within a predetermined time from the rising of the case 11 ((15), (6)), the process returns to the check routine after the program step (7) in FIG. If the case 11 is allowed to float in a short time in this way, there is no possibility of causing troubles in normal work such as temporarily moving the case 11 on the installation base 13, for example.

  The microcomputer 21 may be provided with a relay contact 21b and a resistor R for checking the battery B (FIG. 10A). The relay contact 21b is driven by the microcomputer 21, and the voltage Vb of the battery B is read into the microcomputer 21. Therefore, the relay contact 21b is temporarily turned on to energize the resistor R with a predetermined dummy load current, and the voltage Vb at that time is checked to determine whether the battery B is good or not. Can be displayed (program steps (20) and (21) in FIG. 10B). However, FIGS. 10A and 10B are a main part block system diagram and a main part program flowchart, respectively, and program step (7) in FIG. 10B corresponds to program step (7) in FIG. doing.

  In the above description, the microcomputer 23 on the lid 12 side may be integrated with the microcomputer 21 on the case 11 side. In addition, the slots S1, S1,..., S2, S2... For the USB memory M1 and the SD card M2 may be prepared for any number of elements including at least one, and for other arbitrary semiconductor memory elements. Slot may be included. Further, the total number of memory elements to be mounted and stored in the slots S1 and S2 in the case 11 can be arbitrarily set.

  The present invention can be widely and suitably applied to a use for storing a semiconductor memory device and preventing leakage of stored data to realize high security.

M1 ... USB memory M2 ... SD card S1, S2 ... Slot 11 ... Case 12 ... Lid 13 ... Installation stand 21 ... Microcomputer 22 ... High voltage generation circuit 23 ... Microcomputer 23a ... Numeric keypad 24 ... Display

Patent Applicant Linear Circuit Co., Ltd.

Claims (5)

A case with a lockable lid, a plurality of slots for memory elements installed in the case, a microcomputer housed in the case, and a high voltage generation circuit, the microcomputer having a predetermined authentication actuates said lid front Symbol high voltage generating circuit when opened in locked without entering a code, a plurality of memory devices on the slots of a high voltage from the high voltage generating circuit is supplied to the respective slot A storage device for a memory element, wherein the memory device is electrically destroyed at once .   The microcomputer activates the high voltage generation circuit to electrically connect the memory element in the slot when the case whose lid is locked is lifted from a predetermined installation surface without inputting a predetermined authentication code. 2. The storage device for a memory device according to claim 1, wherein the storage device is destroyed.   3. The storage device for a memory device according to claim 1, wherein the slot includes at least one for a USB memory or an SD card.   4. The storage device for a memory element according to claim 1, wherein the microcomputer is combined with a microcomputer on the lid side.   5. The storage device for a memory device according to claim 4, wherein a numeric keypad for inputting an authentication code and a display mounted on the surface of the lid are connected to the lid-side microcomputer.

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