JP6097178B2 - Switch circuit and switch control method using the same - Google Patents

Description

  The present invention provides a switch circuit that includes a short-circuit portion that short-circuits between open electrodes and an open portion that opens between energized electrodes, and switches the entire circuit to an energized state or a cut-off state, and switch control using the same Regarding the method.

  For activation of various devices and software, send the serial ID attached to the device and software package to the manufacturer together with data with unique values for each computer such as computer hardware information and IP address, Next, it is performed by inputting from the software a “protection release key” that can be used only with the combination of the transmitted serial ID and computer sent from the manufacturer.

  By performing the activation, various devices and software can be used, or restricted functions become effective. Also, depending on the license conditions, for example, after a certain period of time has elapsed or after a predetermined number of uses, the functions of various devices and software are limited.

  Switching on and off of a series of functions associated with this type of activation is generally controlled by software.

JP 2010-003665 A

  However, in function control by software, there is a risk that functions are turned on and off illegally due to recent illegal copying, hacking, cracking, and the like.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a switch circuit capable of irreversibly performing switching control and effectively countering unauthorized use, and a switch control method using the switch circuit.

  In order to solve the above-described problem, a switch circuit according to the present invention includes a first fusible conductor and a first heating element that melts the first fusible conductor, and the first heating element. The first fusible conductor is melted by causing the first fusible conductor to melt, a short-circuit portion that short-circuits between the open electrodes by the molten conductor, a second fusible conductor disposed between the energizing electrodes, and the second A second heating element that melts the fusible conductor, and heats the second heating element to melt the second fusible conductor and opens between the energization electrodes; A first current control element that controls power feeding to one heating element, and a second current control element that controls power feeding to the second heating element, the open electrode of the short-circuit portion, and the The current-carrying electrode in the open part is connected in series.

  The switch circuit according to the present invention includes a first fusible conductor and a first heating element that melts the first fusible conductor, and the first heating element generates heat to generate heat. The first soluble conductor is melted, the short-circuit portion between the open electrodes is short-circuited by the molten conductor, the second soluble conductor disposed between the energized electrodes, and the second soluble conductor is melted. An open portion that melts the second soluble conductor by causing the second heat generating element to generate heat and opens the gap between the energizing electrodes, and power supply to the first heat generating element. A first current control element that controls power supply and a second current control element that controls power feeding to the second heating element, and the open electrode of the short-circuit part and the conductive electrode of the open part, Are connected in parallel.

  In addition, the switch control method according to the present invention includes a first fusible conductor and a first heating element that melts the first fusible conductor, and the first heating element generates heat by causing the first heating element to generate heat. The first soluble conductor is melted, the short-circuit portion that short-circuits between the open electrodes by the molten conductor, the second soluble conductor disposed between the energized electrodes, and the second soluble conductor is melted. A second heating element, the second heating element is heated to melt the second soluble conductor, and the current-carrying electrode is opened, and an opening to the first heating element is provided. A first current control element that controls power feeding; and a second current control element that controls power feeding to the second heating element, the open electrode of the short-circuit part and the conductive electrode of the open part. Are connected in series, and the first current control element is used to shorten the distance between the open electrodes of the short-circuit portion. Is allowed, switching the entire circuit from the cutoff state to the conduction state, the second current control element is opened between the powered electrode of the opening, switches the entire circuit to re-cutoff state from the conduction state.

  In addition, the switch control method according to the present invention includes a first fusible conductor and a first heating element that melts the first fusible conductor, and the first heating element generates heat by causing the first heating element to generate heat. The first soluble conductor is melted, the short-circuit portion that short-circuits between the open electrodes by the molten conductor, the second soluble conductor disposed between the energized electrodes, and the second soluble conductor is melted. A second heating element, the second heating element is heated to melt the second soluble conductor, and the current-carrying electrode is opened, and an opening to the first heating element is provided. A first current control element that controls power feeding; and a second current control element that controls power feeding to the second heating element, the open electrode of the short-circuit part and the conductive electrode of the open part. Are connected in parallel, and the current-carrying electrodes of the open part are opened by the second current control element. Is allowed, switching the entire circuit from the energized state to the cutoff state, said to short-circuit the above open electrodes of the short-circuit portion by the first current control element, in which switching to re-energized the entire circuit from the cutoff state.

  According to the present invention, since the entire circuit is energized and cut off by melting the first and second fusible conductors, the circuit function can be controlled on and off physically and irreversibly. Therefore, unlike the case where the on / off of the function is controlled by software, the vulnerability to unauthorized use due to unauthorized copying, hacking, cracking, etc. can be improved.

It is a block diagram which shows the structure of the 1st switch circuit to which this invention was applied. It is a circuit diagram which shows the structure of a 1st switch circuit. It is a circuit diagram which shows the 1st switch circuit made into the energized state by the short circuit part. It is a circuit diagram which shows the 1st switch circuit made into the interruption | blocking state by the open part. It is a circuit diagram which shows the other structure of a 1st switch circuit. It is a block diagram which shows the structure of the 2nd switch circuit to which this invention was applied. It is a circuit diagram which shows the structure of a 2nd switch circuit. It is a circuit diagram which shows the 2nd switch circuit made into the interruption | blocking state by the open part. It is a circuit diagram which shows the 2nd switch circuit made into the energization state by the short circuit part. It is a circuit diagram which shows the other structure of a 1st switch circuit. It is a figure which shows the structural example of a short circuit element, (A) is a top view, (B) is sectional drawing. It is a figure which shows the short circuit element which the meltable conductor fuse | melted and short-circuited, (A) is a top view, (B) is sectional drawing. It is a figure which shows the structural example of an open element, (A) is a top view, (B) is sectional drawing. It is a figure which shows the open element which the soluble conductor fuse | melted and short-circuited, (A) is a top view, (B) is sectional drawing.

  Hereinafter, a switch circuit to which the present invention is applied and a switch control method using the same will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention. Further, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  The first switch circuit 1 to which the present invention is applied switches the function of a device from an off state to an on state, and switches it back to an off state again. The second switch circuit 2 to which the present invention is applied switches the function of the device from the on-state to the off-state, and switches it back on. Each of the first and second switch circuits 1 and 2 includes a short-circuit portion that short-circuits between the open electrodes and an open portion that opens between the energized electrodes, and includes a short-circuit portion and an open portion according to the application to be applied. They are connected in series or in parallel. Moreover, the short circuit part and open | release part of the 1st, 2nd switch circuits 1 and 2 physically short-circuit between open electrodes by opening a soluble conductor, or open between energized electrodes. Therefore, the first and second switch circuits 1 and 2 can irreversibly switch the function of the application. Details will be described below.

[First switch circuit]
As shown in FIG. 1, the first switch circuit 1 includes a short-circuit portion 10 that short-circuits the first and second open electrodes 11 and 12 and an open-circuit that opens the first and second energizing electrodes 21 and 22. The short circuit part 10 and the open part 20 are connected in series. In the first switch circuit 1, the open section 20 is connected to the power supply 3 of the device whose function is controlled on and off by the first switch circuit 1, and the short circuit section 10 is connected to the functional circuit 4 of the device. ing. Further, the first switch circuit 1 receives the short circuit signal, and opens the first current control element 13 that controls the current so that the short circuit portion 10 is short-circuited between the first and second open electrodes 11 and 12. It has a second current control element 23 that receives the signal and controls the open portion 20 so that the first and second current-carrying electrodes 21 and 22 are opened.

  Specifically, as shown in FIG. 2, the first switch circuit 1 is configured by connecting a short-circuit element 10 </ b> A constituting the short-circuit portion 10 and an open element 20 </ b> A constituting the open-circuit portion 20 in series. Can do.

[Short-circuit element]
The short-circuit element 10 </ b> A includes first and second open electrodes 11 and 12 opened in an initial stage, a first soluble conductor 14, and a first heating element 15 that melts the first soluble conductor 14. With. The short-circuit element 10A melts the first fusible conductor 14 by causing the first heating element 15 to generate heat, and a switch 16 that short-circuits the first and second open electrodes 11 and 12 with the molten conductor. Configure. In the short-circuit element 10A, the first open electrode 11 is connected to the second energizing electrode 22 of the open element 20A, and the second open electrode 12 is connected to the functional circuit 4 of the device.

  The first soluble conductor 14 has one end connected to the first open electrode 11 and the other end connected to the first heating element 15. The first heating element 15 is connected to the first current control element 13 via the heating element electrode 17. The first current control element 13 controls power feeding to the first heating element 15 and is constituted by, for example, a field effect transistor (hereinafter referred to as FET), and according to a signal from a detection circuit (not shown). Works.

  The first fusible conductor 14 and the first heating element 15 are connected in series, and when the first current control element 13 is activated, the first heating element is connected from the power source 3 via the first fusible conductor 14. 15 is fed. When the first heating element 15 generates heat, the first soluble conductor 14 is melted, and the first and second open electrodes 11 and 12 are short-circuited by the molten conductor. As a result, the switch 16 is turned on, the power of the power supply 3 is supplied to the functional circuit 4, and the function of the device is turned on. Moreover, when the 1st soluble conductor 14 fuse | melts, the electric power feeding path | route to the 1st heat generating body 15 is interrupted | blocked, and heat_generation | fever of the 1st heat generating body 15 stops.

[Open element]
The open element 20 </ b> A includes a second fusible conductor 24 disposed between the energizing electrodes 21 and 22, and a second heating element 25 that melts the second fusible conductor 24. By causing 25 to generate heat, the second soluble conductor 24 is melted, and the first and second current-carrying electrodes 21 and 22 are opened. In the open element 20A, the first energization electrode 21 is connected to the power source 3 of the device, and the second energization electrode 22 is connected to the first open electrode 11 of the short-circuit element 10A.

  The second soluble conductor 24 is disposed between the first energizing electrode 21 and the second energizing electrode 22. Thus, the open element 20A is energized between the first and second energization electrodes 21 and 22. One end of the second heating element 25 is connected to the power source 3 via the second soluble conductor 24, and the other end is connected to the second current control element 23 via the heating element electrode 26. The second current control element 23 controls power feeding to the second heating element 25, is constituted by, for example, an FET, and operates according to a signal from a detection circuit (not shown).

  When the second second current control element 23 is activated, power is supplied from the power source 3 to the second heating element 25 via the second soluble conductor 24. When the second heating element 15 generates heat, the second fusible conductor 24 is melted, and the first and second current-carrying electrodes 21 and 22 are opened. As a result, the power supply path from the power supply 3 to the functional circuit 4 is interrupted, and the function of the device is turned off. Moreover, when the 2nd soluble conductor 24 fuse | melts, the electric power feeding path | route to the 2nd heat generating body 25 is interrupted | blocked, and heat_generation | fever of the 2nd heat generating body 25 stops.

[First switch control method]
As shown in FIG. 2, the first switch circuit 1 initially opens between the first and second open electrodes 11 and 12 of the short-circuit portion 10, and the first and second energizations of the open portion 20. The electrodes 21 and 22 are short-circuited via the second soluble conductor 24. In the first switch circuit 1, power supply to the first and second heating elements 15 and 25 is stopped by the first and second current control elements 13 and 23. As a result, in the first switch circuit 1, the power supply path from the power source 3 to the functional circuit 4 is cut off, and a part or all of the device functions are disabled.

  When activating the device, first, a short circuit signal is supplied from the detection circuit to the first current control element 13, and the first current control element 13 is activated. Then, the power of the power source 3 is supplied to the first heating element 15 and the first heating element 15 starts to generate heat. The first fusible conductor 14 is blown by transferring heat of the first heating element 15.

  As a result, as shown in FIG. 3, the first and second open electrodes 11, 12, where the molten conductor of the first soluble conductor 14 is open, is short-circuited, the switch 16 is turned on, and the power source 3 The power supply path to the functional circuit 4 is connected, and the function of the device can be used. Moreover, when the 1st soluble conductor 14 fuse | melts, the electric power feeding path | route to the 1st heat generating body 15 is interrupted | blocked, and heat_generation | fever of the 1st heat generating body 15 stops.

  Depending on the license conditions, for example, after a certain period of time has elapsed, after a predetermined number of times of use, or when the device is to be discarded, the second current control is required. An open signal is supplied to the element 23 from the detection circuit, and the second current control element 23 is activated. Then, the power of the power source 3 is supplied to the second heating element 25, and the second heating element 25 starts to generate heat. The second fusible conductor 24 is blown by transferring heat of the second heating element 15.

  As a result, as shown in FIG. 4, the first and second current-carrying electrodes 21 and 22 that are short-circuited by the second soluble conductor 24 are cut off, and the power supply path from the power supply 3 to the functional circuit 4 is cut off. As a result, the function of the device becomes unusable. Moreover, when the 2nd soluble conductor 24 fuse | melts, the electric power feeding path | route to the 2nd heat generating body 25 is interrupted | blocked, and heat_generation | fever of the 2nd heat generating body 25 stops.

  Thus, according to the first switch circuit 1, the first and second fusible conductors 14 and 24 are sequentially melted to connect and cut off the current path between the power supply 3 and the functional circuit 4. The function can be switched from the off state to the on state, and again to the off state. At this time, according to the first switch circuit 1, the first and second fusible conductors 14 and 24 are melted to connect and cut off the current path between the power supply 3 and the functional circuit 4. Function on / off can be controlled physically and irreversibly. Therefore, unlike the case where the on / off of the function is controlled by software, the vulnerability to unauthorized use due to unauthorized copying, hacking, cracking, etc. can be improved.

  In the first switch circuit 1 described above, there is one second soluble conductor 24 of the open element 20A in terms of the circuit configuration, but as shown in FIG. 5, the second soluble conductors 24a and 24b. You may have two.

[Second switch circuit]
Next, the second switch circuit 2 will be described. In the following description, the same components as those of the first switch circuit 1 described above are denoted by the same reference numerals and the details thereof are omitted. As shown in FIG. 6, the second switch circuit 2 includes a short-circuit portion 10 and an open portion 20, and the short-circuit portion 10 and the open portion 20 are connected in parallel between the power supply 3 and the functional circuit 4. ing. The second switch circuit 2 receives the short circuit signal, and opens the first current control element 13 that controls the current so that the short circuit portion 10 is short-circuited between the first and second open electrodes 11 and 12. It has a second current control element 23 that receives the signal and controls the open portion 20 so that the first and second current-carrying electrodes 21 and 22 are opened.

  Specifically, as shown in FIG. 7, the second switch circuit 2 is configured by connecting a short-circuit element 10 </ b> A constituting the short-circuit portion 10 and an open element 20 </ b> A constituting the open-circuit portion 20 in parallel. Can do.

[Short-circuit element]
In the second switch circuit 2, the short-circuit element 10 </ b> A has a first open electrode 11 connected to the power source 3 and a second open electrode 12 connected to the functional circuit 4 of the device. The other configuration of the short-circuit element 10A is as described above.

[Open element]
In the second switch circuit 2, the open element 20 </ b> A has a first current-carrying electrode 21 connected to the power source 3 of the device and a second current-carrying electrode 22 connected to the functional circuit 4 of the device. The other configuration of the opening element 20A is as described above.

[Second switch control method]
As shown in FIG. 7, the second switch circuit 2 initially opens between the first and second open electrodes 11, 12 of the short-circuit portion 10, and the first and second energizations of the open portion 20. The electrodes 21 and 22 are short-circuited via the second soluble conductor 24. In the second switch circuit 2, power supply to the first and second heating elements 15 and 25 is stopped by the first and second current control elements 13 and 23. As a result, the second switch circuit 2 secures a power supply path from the power supply 3 to the functional circuit 4 via the open portion 20, and the function of the device can be used.

  If it is necessary to limit the function of the device or software, for example, after the initial free usage period has elapsed or the initial free usage count has been used, depending on the license conditions, the second current control element 23 An open signal is supplied from the detection circuit to the second current control element 23. Then, the power of the power source 3 is supplied to the second heating element 25, and the second heating element 25 starts to generate heat. The second fusible conductor 24 is blown by transferring heat of the second heating element 15.

  As a result, as shown in FIG. 8, the first and second current-carrying electrodes 21 and 22 that are short-circuited by the second soluble conductor 24 are cut off, and the power supply path from the power supply 3 to the functional circuit 4 is cut off. As a result, the function of the device becomes unusable. Moreover, when the 2nd soluble conductor 24 fuse | melts, the electric power feeding path | route to the 2nd heat generating body 25 is interrupted | blocked, and heat_generation | fever of the 2nd heat generating body 25 stops.

  When the user performs a license contract procedure and activates the device, first, a short circuit signal is supplied from the detection circuit to the first current control element 13, and the first current control element 13 is activated. Then, the power of the power source 3 is supplied to the first heating element 15 and the first heating element 15 starts to generate heat. The first fusible conductor 14 is blown by transferring heat of the first heating element 15.

  As a result, as shown in FIG. 9, the first and second open electrodes 11, 12 where the molten conductor of the first fusible conductor 14 is open is short-circuited, and power is supplied from the power supply 3 to the functional circuit 4. The path is connected and the device functions can be used. Moreover, when the 1st soluble conductor 14 fuse | melts, the electric power feeding path | route to the 1st heat generating body 15 is interrupted | blocked, and heat_generation | fever of the 1st heat generating body 15 stops.

  Thus, according to the second switch circuit 2, the current path between the power source 3 and the functional circuit 4 is interrupted and reconnected by sequentially melting the first and second fusible conductors 14 and 24. The function can be switched from the on state to the off state and then back to the on state. At this time, according to the second switch circuit 2, the current path between the power source 3 and the functional circuit 4 is interrupted and reconnected by melting the first and second fusible conductors 14, 24. The function can be controlled on and off physically and irreversibly. Therefore, unlike the case where the on / off of the function is controlled by software, the vulnerability to unauthorized use due to unauthorized copying, hacking, cracking, etc. can be improved.

  In the second switch circuit 2 described above, there is one second soluble conductor 24 of the open element 20A in terms of circuit configuration, but as shown in FIG. 10, the second soluble conductors 24a and 24b are provided. You may have two.

[Element configuration example]
[Short-circuit element]
Next, a configuration example of the short-circuit element 10A will be described. FIG. 11A shows a plan view of the short-circuit element 10A, and FIG. 11B shows a cross-sectional view of the short-circuit element 10A. The short-circuit element 10A includes an insulating substrate 30, a first heating element 15 provided on the insulating substrate 30, and a first open electrode 11 and a second open electrode 12 provided adjacent to each other on the insulating substrate 30. A third electrode 31 provided adjacent to the first open electrode 11 and electrically connected to the first heating element 15; and a second electrode provided adjacent to the second open electrode 12. 4, the first open electrode 11, and the third open electrode 31 are provided between the first open electrode 11 and the third electrode 31 to form a current path, and the first open electrode 11 is heated by the first heating element 15. A first fusible conductor 14a that melts the current path between the first open electrode 11 and the second open electrode 11 and shorts between the first open electrode 11 and the second open electrode 12, and the second open electrode 12 and the fourth open electrode 12. Between the electrode 32 and by heating from the first heating element 15 And fusion, and a first, a first fusible conductor 14b for short-circuiting between the second opening electrodes 11 and 12. And the cover member 33 which protects the inside of the short circuit element 10A on the insulating substrate 30 is attached.

  The insulating substrate 30 is formed in a substantially square shape using an insulating member such as alumina, glass ceramics, mullite, zirconia, and the like. In addition, the insulating substrate 30 may be made of a material used for a printed wiring board such as a glass epoxy board or a phenol board, but it is necessary to pay attention to the temperature at which the first fusible conductors 14a and 14b are blown. is there.

  The first heating element 15 is a conductive member that has a relatively high resistance value and generates heat when energized, and is made of, for example, W, Mo, Ru, or the like. The first heating element 15 is obtained by forming a paste on the insulating substrate 30 using a screen printing technique by mixing a powdery body of these alloys, compositions, or compounds with a resin binder or the like. Or by firing.

  The first heating element 15 is covered with an insulating layer 35 on the insulating substrate 30. The insulating layer 35 efficiently transfers the heat of the first heating element 15 to the first and second open electrodes 11 and 12 and the third and fourth electrodes 31 and 32, and the first soluble conductor 14 a, The molten conductor 14b is provided on the first and second open electrodes 11 and 12 for aggregation, and is made of, for example, a glass layer.

  On the insulating layer 35 covering the first heating element 15, the first and second open electrodes 11 and 12 and the third and fourth electrodes 31 and 32 are formed. The first open electrode 11 is formed adjacent to the second open electrode 12 on one side and insulated. A third electrode 31 is formed on the other side of the first open electrode 11. The first open electrode 11 and the third electrode 31 are electrically connected by mounting the first fusible conductor 14a, constitute a part of the power supply path from the power source 3 to the functional circuit 4, and the first A current path at the time of fusing one soluble conductor 14a, 14b is formed. The first open electrode 11 is connected to an external connection terminal (not shown) provided on the back surface of the insulating substrate 30 through a conductive through hole 36 facing the side surface of the insulating substrate 30. Via the second energizing electrode 22 (FIG. 2) of the open element 20A or the power source 3 (FIG. 7).

  The third electrode 31 is connected to the first heating element 15 through a heating element extraction electrode 37 provided on the insulating substrate 30. The first heating element 15 is connected to the heating element electrode 17 facing the side edge of the insulating substrate 30 via the heating element extraction electrode 37. The heating element electrode 17 is connected to an external connection terminal (not shown) provided on the back surface of the insulating substrate 30 through the conductive through hole 36, and the first current control element 13 is connected to the external heating terminal via the external connection terminal. Connected.

  A fourth electrode 32 is formed on the other side of the second open electrode 12 opposite to the first side adjacent to the first open electrode 11. The first soluble conductor 14 is connected to the second open electrode 12 and the fourth electrode 32. The second open electrode 12 is connected to an external connection terminal (not shown) provided on the back surface of the insulating substrate 30 through a conductive through hole 36 facing the side surface of the insulating substrate 30. And connected to the functional circuit 4 (FIGS. 2 and 7).

  The first and second open electrodes 11 and 12 and the third and fourth electrodes 31 and 32 can be formed using a general electrode material such as Cu or Ag, but at least the first, A coating such as Ni / Au plating, Ni / Pd plating, or Ni / Pd / Au plating is preferably formed on the surfaces of the second open electrodes 11 and 12 by a known plating process. Thereby, oxidation of the 1st, 2nd open electrodes 11 and 12 can be prevented, and a molten conductor can be held reliably. Further, when the short-circuit element 10A is mounted by reflow soldering, the solder that connects the first fusible conductor 14 or the low melting point metal that forms the outer layer of the first fusible conductor 14 is melted so that the first and second fusible elements 14A are melted. It is possible to prevent the open electrodes 11 and 12 from being cut by being eroded (soldered).

[Soluble conductor]
The first fusible conductors 14a and 14b can use any metal that is quickly melted by the heat generated by the first heating element 15. For example, a low-melting-point metal such as Pb-free solder mainly containing Sn. Can be suitably used.

  The first soluble conductors 14a and 14b may contain a low melting point metal and a high melting point metal. As the low melting point metal, it is preferable to use solder such as Pb-free solder, and as the high melting point metal, it is preferable to use Ag, Cu or an alloy containing these as a main component. By including a high melting point metal and a low melting point metal, when the short circuit element 10A is reflow mounted, even if the reflow temperature exceeds the melting temperature of the low melting point metal and the low melting point metal melts, the low melting point of the inner layer The outflow of the metal to the outside can be suppressed, and the shapes of the first soluble conductors 14a and 14b can be maintained. In addition, even when fusing, the low melting point metal melts, and the high melting point metal is eroded (soldered), so that the fusing can be quickly performed at a temperature lower than the melting point of the high melting point metal.

  The first soluble conductors 14a and 14b can be configured with a low melting point metal layer as an inner layer and a high melting point metal layer as an outer layer. Such first soluble conductors 14a and 14b can be formed by forming a high melting point metal layer on a low melting point metal foil using a plating technique, or other well-known lamination techniques, It can also be formed using a film formation technique. The first soluble conductors 14a and 14b may be configured such that the high melting point metal layer is an inner layer and the low melting point metal layer is an outer layer, and the low melting point metal layer and the high melting point metal layer are alternately laminated. Alternatively, a multilayer structure of four or more layers may be used.

  The first soluble conductors 14a and 14b are connected to the first and second open electrodes 11 and 12 and the third and fourth electrodes 31 and 32 by using solder or the like.

  In order to prevent oxidation of the first soluble conductors 14a and 14b and improve wettability when the first soluble conductors 14a and 14b are melted, the first soluble conductors 14a and 14b are placed on the first soluble conductors 14a and 14b. A flux 39 is applied.

  The inside of the short-circuit element 10 </ b> A is protected by the insulating substrate 30 being covered with the cover member 33. The cover member 33 has a side wall 33a that constitutes a side surface of the short-circuit element 10A and a top surface portion 33b that constitutes an upper surface of the short-circuit element 10A, and the side wall 33a is connected to the insulating substrate 30 so that the short-circuit element 10A. It becomes a lid that closes the inside of the. The cover member 33 is formed using an insulating member such as a thermoplastic plastic, ceramics, glass epoxy substrate, etc., similarly to the insulating substrate 30.

  Further, the cover member 33 may be formed with a cover electrode 33c on the inner surface side of the top surface portion 33b. The cover part electrode 33 c is formed at a position overlapping the first and second open electrodes 11 and 12. When the first heating element 15 generates heat and the first fusible conductors 14a and 14b are melted, the cover electrode 33c has a molten conductor aggregated on the first and second open electrodes 11 and 12. By being wetted by contact, the molten conductor can be reliably held between the first and second open electrodes 11 and 12, and the allowable amount to be held can be increased.

  When the device is activated, the short-circuit element 10A operates in response to the short-circuit signal from the first current control element 13, whereby the first short-circuit element 10A is connected to the power supply 3 from the first open electrode 11 side. Electric power is supplied to the heating element electrode 17 through the soluble conductor 14 a, the heating element extraction electrode 37, and the first heating element 15. Therefore, the first heating element 15 generates heat when energized. When the first soluble conductors 14a and 14b are melted by this heat, the molten conductors agglomerate on the first and second open electrodes 11 and 12, as shown in FIGS. Since the first and second open electrodes 11 and 12 are formed adjacent to each other, the agglomerated molten conductors are combined on the first and second open electrodes 11 and 12, whereby the first and second open electrodes 11 and 12 are combined. The open electrodes 11 and 12 are short-circuited. That is, the shorting element 10A is short-circuited between both terminals of the switch 16 (FIGS. 3 and 9).

  The energization of the first heating element 15 is stopped because the first open electrode 11 and the third electrode 31 are blocked by the first fusible conductor 14a being blown.

[Open element]
Next, a configuration example of the open element 20A will be described. The open element 20A is formed at both ends of the insulating substrate 50, the second heating element 25 laminated on the insulating substrate 50 and covered with the insulating member 51, and the insulating substrate 50, as shown in FIG. The first energizing electrode 21 and the second energizing electrode 22, the heating element extraction electrode 52 laminated on the insulating member 51 so as to overlap the second heating element 25, and both ends of the first and second energizing electrodes A second soluble conductor 24 connected to each of the energizing electrodes 21 and 22 and having a central portion connected to the heating element extraction electrode 52;

  The insulating substrate 50, the second heating element 25, and the second soluble conductor 24 are the same as the insulating substrate 30, the first heating element 15, and the first soluble conductor 14 used in the short-circuit element 10A. Therefore, details are omitted.

  In the open element 20 </ b> A, an insulating member 51 is disposed so as to cover the heating element 14, and a heating element extraction electrode 52 is disposed so as to face the second heating element 25 through the insulating member 15. In order to efficiently transfer the heat of the second heating element 25 to the second soluble conductor 24, an insulating member 51 may be laminated between the second heating element 25 and the insulating substrate 50. As the insulating member 51, for example, glass can be used.

  One end of the heating element lead-out electrode 52 is connected to the first heating element electrode 26a, and is continuous with one end of the second heating element 25 through the first heating element electrode 26A. The other end of the second heating element 25 is connected to the second heating element electrode 26b. The second heating element electrode 26 b is connected to an external connection terminal (not shown) formed on the back surface of the insulating substrate 50 through a conductive through hole 55 formed in the insulating substrate 50. The second heating element 25 is connected to the second current control element 23 via the second heating element electrode 26b and the external connection terminal.

  The second soluble conductor 24 is connected to the heating element extraction electrode 52 and the first and second energization electrodes 21 and 22 by soldering or the like. The second fusible conductor 24 can be easily connected by reflow soldering.

  As shown in FIG. 13, the first energizing electrode 21 and the second energizing electrode 22 formed on both side edges of the insulating substrate 50 and connected by the second fusible conductor 24 have through holes 55 respectively. And an external connection terminal (not shown) provided on the back surface of the insulating substrate 50. The 1st electricity supply electrode 21 is connected with the power supply 3 via an external connection terminal (FIG. 2, FIG. 7). The second energizing electrode 22 is connected to the first open electrode 11 (FIG. 2) or the functional circuit 4 (FIG. 7) of the short-circuit element 10A via an external connection terminal.

  In addition, the 1st, 2nd electricity supply electrodes 21 and 22 and the heat generating body extraction electrode 52 can also be formed using common electrode materials, such as Cu and Ag, and the 1st, 2nd electricity supply electrodes 21 are used. 22 and the surface of the heating element extraction electrode 52 are preferably formed by a known plating process such as Ni / Au plating, Ni / Pd plating, Ni / Pd / Au plating. Thereby, oxidation of the 1st, 2nd electricity supply electrodes 21 and 22 and the heat generating body extraction electrode 52 can be prevented, and a molten conductor can be hold | maintained reliably. Further, when the open element 20A is reflow-mounted, the first melting point and the second melting point 24 are melted by the solder connecting the second soluble conductor 24 or the low melting point metal forming the outer layer of the second soluble conductor 24. It is possible to prevent the energization electrodes 21 and 22 and the heating element extraction electrode 52 from being melted (soldered) and cut.

  The open element 20A is formed on almost the entire surface of the second soluble conductor 24 in order to prevent the second soluble conductor 24 from being oxidized and to improve the wettability when the second soluble conductor 24 is melted. A flux 57 is applied. Also in the open element 20A, a cover member 58 is provided on the insulating substrate 50 in order to protect the inside.

  When the open element 20A interrupts the function of the device, the second current control element 23 operates upon receiving an open signal, whereby electric power is supplied from the power source 3 side, and the second heating element 25 is energized. Generate heat. When the second fusible conductor 24 is melted by this heat, the molten conductor is placed on the heating element extraction electrode 52, the first and second energizing electrodes 21 and 22, as shown in FIGS. Aggregate. As a result, the first and second current-carrying electrodes 21 and 22 are opened, and the current path between the power supply 3 and the functional circuit 4 is interrupted (FIGS. 4 and 8).

  The energization of the second heat generating element 25 is stopped because the first conductive electrode 21 and the second heat generating element electrode 26b are interrupted when the second soluble conductor 24 is melted.

DESCRIPTION OF SYMBOLS 1 1st switch circuit, 2nd 2nd switch circuit, 3 Power supply, 4 Functional circuit, 10 Short circuit part, 10A Short circuit element, 11 1st open electrode, 12 2nd open electrode, 13 1st current control element , 14 1st soluble conductor, 15 1st heating element, 16 switch, 17 heating element electrode, 20 opening part, 20A opening element, 21 1st electricity supply electrode, 22 2nd electricity supply electrode, 23 2nd Current control element, 24 second soluble conductor, 25 second heating element, 26 heating element electrode, 30 insulating substrate, 31 third electrode, 32 fourth electrode, 33 cover member, 35 insulating layer, 36 conductive Through hole, 37 Heating element extraction electrode, 39 Flux, 50 Insulating substrate, 51 Insulating member, 55 Conductive through hole, 57 Flux, 58 Cover member

Claims (6)

A first fusible conductor and a first heating element that melts the first fusible conductor; the first fusible conductor is melted by heating the first heating element; and A short-circuit portion that short-circuits between the open electrodes by the molten conductor;
A second fusible conductor disposed between the current-carrying electrodes; and a second heating element for melting the second fusible conductor; and generating the second heating element by generating heat. Melting the fusible conductor and opening between the energizing electrodes;
A first current control element for controlling power feeding to the first heating element;
A second current control element for controlling power feeding to the second heating element,
A switch circuit in which the open electrode of the short-circuit portion and the energization electrode of the open portion are connected in series. Short-circuiting between the open electrodes of the short-circuit portion by the first current control element, the entire circuit is switched from a cut-off state to an energized state,
2. The switch circuit according to claim 1, wherein the second current control element opens the gap between the energization electrodes of the open portion to switch the entire circuit from the energized state to the interrupted state again. A first fusible conductor and a first heating element that melts the first fusible conductor; the first fusible conductor is melted by heating the first heating element; and A short-circuit portion that short-circuits between the open electrodes by the molten conductor;
A second fusible conductor disposed between the current-carrying electrodes; and a second heating element for melting the second fusible conductor; and generating the second heating element by generating heat. Melting the fusible conductor and opening between the energizing electrodes;
A first current control element for controlling power feeding to the first heating element;
A second current control element for controlling power feeding to the second heating element,
A switch circuit in which the open electrode of the short-circuit portion and the energization electrode of the open portion are connected in parallel. Opening the gap between the energization electrodes of the open portion by the second current control element, and switching the entire circuit from an energized state to an interrupted state;
4. The switch circuit according to claim 3, wherein the first current control element is used to short-circuit the open electrodes of the short-circuit portion, and the entire circuit is switched from the interrupted state to the energized state again. A first fusible conductor and a first heating element that melts the first fusible conductor; the first fusible conductor is melted by heating the first heating element; and A short-circuit portion that short-circuits between the open electrodes by the molten conductor;
A second fusible conductor disposed between the current-carrying electrodes; and a second heating element for melting the second fusible conductor; and generating the second heating element by generating heat. Melting the fusible conductor and opening between the energizing electrodes;
A first current control element for controlling power feeding to the first heating element;
A second current control element for controlling power feeding to the second heating element,
The open electrode of the short-circuit portion and the energizing electrode of the open portion are connected in series,
Short-circuiting between the open electrodes of the short-circuit portion by the first current control element, the entire circuit is switched from a cut-off state to an energized state,
A switch control method in which the current-carrying electrodes of the open part are opened by the second current control element, and the entire circuit is switched from the energized state to the cut-off state again. A first fusible conductor and a first heating element that melts the first fusible conductor; the first fusible conductor is melted by heating the first heating element; and A short-circuit portion that short-circuits between the open electrodes by the molten conductor;
A second fusible conductor disposed between the current-carrying electrodes; and a second heating element for melting the second fusible conductor; and generating the second heating element by generating heat. Melting the fusible conductor and opening between the energizing electrodes;
A first current control element for controlling power feeding to the first heating element;
A second current control element for controlling power feeding to the second heating element,
The open electrode of the short-circuit portion and the energizing electrode of the open portion are connected in parallel,
Opening the gap between the energization electrodes of the open portion by the second current control element, and switching the entire circuit from an energized state to an interrupted state;
A switch control method for short-circuiting the open electrodes of the short-circuit portion by the first current control element and switching the entire circuit from the cut-off state to the energized state again.

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