JP2008003001A - Rupture test method of electrical conductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy to executable rupture test method for electrical conductors. <P>SOLUTION: This method includes a first step S1 for increasing the current value of a current X sent into a sample by a prescribed value each time, when a prescribed time interval elapses until the sample is fused; a second step S2 for acquiring the current value of the current X to be sent into the sample at a time interval containing fusion time, when the sample is fused; a third step S3 for sending a fusing current value acquired in the second step S2 into another or a plurality of other samples, respectively having a material and a shape similar to the sample; a fourth step S4 for measuring the fusing time, until another or the plurality of other samples are fused; and a fifth step S5 for determining whether the measured fusing time is within a time interval of 60 seconds. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fusing test method for conductors such as gold wires and fuses.

  Conventionally, fusing tests have been performed on bonding wires and wiring fuses used in electronic devices. For example, a blow test for a wiring fuse is defined in JIS (C 8352-1983).

  However, the fusing test stipulated in the above JIS is not easy to implement because an expensive measuring instrument that requires a complicated operation such as an oscilloscope is used. Accordingly, an object of the present invention is to provide a conductor fusing test method that is easy to implement.

  The present invention is a conductor fusing test method that is performed by passing a current through a conductor, and increases the current value that flows through the conductor by a predetermined value every time a predetermined time interval elapses until the conductor is blown. And a second step of acquiring a current value to be passed through the conductor in a time interval including the time of the fusing when the conductor is blown out. Therefore, if the current value of the current flowing through the conductor and the time during which this current is passed through the conductor can be measured, the fusing characteristics of the conductor can be achieved without using an expensive measuring instrument that requires complicated operations such as an oscilloscope. It is possible to perform a fusing test for quantification.

  Further, in the present invention, a third step in which the current value acquired in the second step is passed through one or more other conductors having the same material and shape as the conductor used in the second step, It is preferable to further include a fourth step of measuring the time until the one or more conductors are blown after the step. Therefore, by determining whether or not the time measured in the fourth step is within the above time interval, the reproducibility of the current value acquired in the second step can be easily confirmed.

  According to the present invention, it is possible to provide an electric conductor fusing test method that is easy to implement.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, if possible, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted. First, with reference to Fig.1 (a), the structure of the fusing test apparatus 10 which concerns on embodiment is demonstrated. The fusing test apparatus 10 is an apparatus used for a fusing test (a test for quantifying the fusing characteristics of a conductor) with respect to a conductor (hereinafter referred to as a sample 8) such as a gold wire or a fuse. 4 and a power source 6. Examples of the conductor of the sample 8 include a metal body, a superconductor, a transparent conductor, and an organic conductor. Examples of the metal body include materials made of conductive metals or alloys. Typically, gold, silver, copper, iron, zinc, lead, tin, silicon, aluminum, titanium, nickel, chromium, Examples thereof include materials composed of zirconium, manganese, vanadium, beryllium, bismuth, cadmium , platinum, tungsten , or alloys thereof, and materials usually used for electric wires, fuses, solders, thermocouples, and the like. As the superconductor, typically, Pb-based material, Nb-based material, Mo-based amorphous material, Cu-based (for example, Ba—Y—Cu—O-based) oxide material, or Bi-based (for example, Ba-based). -Pb-Bi-O-based) oxide materials can be given. Examples of the transparent conductor include a material composed of SnO ₂ : Sb, a material composed of In ₂ O ₃ : Sn, and a material composed of ZnO: Al. As the organic conductor, a material made of polyacetylene, a material made of polythiophene, a material made of expanded polyparaphenylene vinylene, a material made of polythiazyl, a material made of polypyrrole, a material made of polyparaphenylene, or iodine, The material which added dopants, such as a sulfuric acid and a bromine, can be mentioned. Further, examples of the shape of the sample 8 include a wire shape, a film shape, and a thin film shape, but the shape of the sample 8 is preferably a wire shape from the viewpoint of a shape that is preferably adapted to the present invention.

  The electronic load device 2 causes the current X to flow through the sample 8 under the control of the control device 4. The control device 4 is a PC (Personal Computer) or the like, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory) and the like (not shown). The CPU executes various programs stored in the ROM or the like. The control device 4 controls the electronic load device 2 by causing the CPU to execute a program. Thereby, the current X flowing through the sample 8 is controlled by the control device 4. Specifically, as shown in FIG. 2, the control device 4 controls the electronic load device 2 so as to increase the current value of the current X by 0.1 A every time interval of 60 seconds. Here, the horizontal axis of the graph shown in FIG. 2 indicates the time (seconds) during which the current X flows through the sample 8, and the vertical axis indicates the current value (A) of the current X. The time interval of 60 seconds is an example, and other time intervals such as 90 seconds and 30 seconds may be used. Furthermore, the increase amount 0.1A of the current value of the current X is also an example, and may be another increase amount such as 0.05A or 0.2A.

  Returning to FIG. The power source 6 is a DC power source for causing the current X to flow through the sample 8. The positive terminal 6 a of the power source 6 is connected to the terminal 2 a of the electronic load device 2, and the negative terminal 6 b of the power source 6 is connected to the terminal 2 b of the electronic load device 2 via the sample 8. The sample 8 is a gold wire, for example, and is attached to the fusing test apparatus 10 as shown in FIG. FIG. 3 shows a state in which one end of the sample 8 is sandwiched between two metal plate pairs 10a and the other end is sandwiched between the other two metal plate pairs 10b. The metal plate pair 10a is sandwiched between the clips 12a, and the metal plate pair 10b is sandwiched between the clips 12b. One of the clip 12 a and the clip 12 b is connected to the terminal 2 b of the electronic load device 2, and the other is connected to the minus terminal 6 b of the power source 6. Note that the diameter of the wire of the sample 8 is, for example, 20 μm, 25 μm, or 30 μm. The metal plate pair 10a and the metal plate pair 10b are made of two metal plates having low electrical resistance such as aluminum, copper, gold or silver.

  Next, with reference to the flowchart shown in FIG. 4, the fusing test of the sample 8 using the fusing test apparatus 10 is demonstrated. Sample 8 used for this fusing test is a gold wire with a diameter of 20 μm. First, until the sample 8 is blown (that is, until the current value of the current X becomes zero), as shown in FIG. 2, the current value of the current X that flows through the sample 8 every time the time interval of 60 seconds elapses. Is increased by an increment of 0.1 A (first step S1). Next, when the sample 8 is blown, the current value (fusing current value) of the current X to be passed (scheduled to flow) to the sample 8 in a time interval including the time of blowing (when the current value of the current X becomes zero). Is acquired (second step S2). Thereby, the fusing current value for fusing the sample 8 is acquired.

  FIG. 5 shows an example of a test result of a fusing test corresponding to the first step S1 and the second step S2 described above. The horizontal axis of the graph shown in FIG. 5 indicates the time (seconds) during which the current X flows through the sample 8, and the vertical axis indicates the current value (A) of the current X. The test results shown in FIG. 5 show that a current X of 0.1 A was passed through the sample 8 for approximately 60 seconds after 6 seconds had elapsed after 1.0 seconds had elapsed from the start of measurement, and 61.1 after the start of measurement. A current X of 0.2 A is applied to the sample 8 for approximately 60 seconds after 12 seconds have elapsed and 121.3 seconds have elapsed, and after approximately 121.2 seconds have elapsed since the start of measurement, approximately 181.3 seconds have elapsed. A current X of 0.3 A is caused to flow through the sample 8 in 60 seconds, and then about 60 seconds elapse after 181.3 seconds have elapsed since the start of measurement, where a current X of 0.4 A is scheduled to flow through the sample 8. It shows that fusing occurred in the sample 8 during the time period (see the portion indicated by the symbol Y in the figure). In this case, current / voltage data is output from the electronic load device 2 to the control device 4 every 0.5 seconds, and it is determined that the fusing is performed when the current value is completely 0A. Since no current fusing occurs in the sample 8 after the time interval of approximately 60 seconds elapses after 181.3 seconds have elapsed from the start of measurement, a current of 0.4 A is scheduled to flow through the sample 8. The fusing current value acquired in step S2 is 0.4A. Here, the details of the test results shown in FIG. 5 are shown in the table of FIG. According to the table of FIG. 6 (a), it can be seen that fusing has occurred in the sample 8 when 182.4 seconds have elapsed after the start of measurement (see the portion indicated by the symbol Z in the figure). Depending on the fusing current value (voltage value) and fusing time of sample 8, a fusing test device 11 shown in FIG. 1B may be used instead of fusing test device 10. The fusing test device 11 has a configuration in which the electronic load device 2 is removed from the fusing test device 10, and in the case of a relatively large fusing current value or fusing time (that is, precise current control using the electronic load device 2). Available).

  Returning to FIG. The current X having the fusing current value acquired in the second step S2 is passed through one or more other samples having the same material and shape as the sample 8 (third step S3), and the one or more samples are fused. Until the time (fusing time) is measured (fourth step S4), and it is determined whether or not the fusing time is within a time interval of 60 seconds (fifth step S5). FIG. 6B shows an example of the measurement result of the fusing time corresponding to the third step S3 to the fifth step S5. The measurement result of the fusing time shown in FIG. 6B is the measurement result when the fusing current value is 0.4A. As shown in FIG. 6B, the current X having the fusing current value acquired in the second step S2 is passed through the other eight samples having the same material and shape as the sample 8 (third step S3). Each fusing time until eight samples fusing was measured (fourth step S4). Then, it is determined whether or not the measured fusing time is within a time interval of 60 seconds (fifth step S5). In addition, you may perform statistical processing, such as calculating an average value, with respect to several fusing time shown in FIG.6 (b).

FIG. 7A to FIG. 7C show the measurement results of the fusing time when a gold wire with a diameter of 20 μm, a gold wire with a diameter of 25 μm, and a gold wire with a diameter of 30 μm are used as samples. FIG. 7A shows the measurement of the fusing time performed after obtaining a fusing current value (0.4 A) for a 20 μm gold wire (that is, after the same test as the first step S1 and the second step S2). A result (namely, the measurement result obtained by the same measurement as 3rd step S3) is shown. FIG. 7B shows the fusing time performed after obtaining a fusing current value (0.5 A) for a 25 μm gold wire (that is, after the same test as the first step S1 and the second step S2). The measurement result (that is, the measurement result obtained by the same measurement as in the third step S3) is shown. Moreover, FIG.7 (c) shows the fusing time performed after acquisition of fusing current value (0.7A) with respect to a 30-micrometer gold wire (namely, after the test similar to 1st step S1 and 2nd step S2). The measurement result (that is, the measurement result obtained by the same measurement as in the third step S3) is shown. It can be seen that any fusing time shown in FIGS. 7A to 7C is within a time interval of 60 seconds. In this way, it is determined whether or not the fusing time is within the 60 second time interval for various samples such as a conductor having a diameter of 20 μm, a conductor having a diameter of 25 μm, and a conductor having a diameter of 30 μm. Thus, the reproducibility of each fusing current value measured for each of these conductors can be easily confirmed.

  As described above, the fusing test according to the embodiment is performed using the fusing test apparatus 10. The fusing test device 10 includes a control device 4 such as a PC and an electronic load device 2 controlled by the control device 4. The fusing test according to the embodiment is such that the current value of the current X that flows through the sample 8 is a predetermined value (for example, a time interval of 60 seconds) until the sample 8 is blown. When the sample 8 is blown out, the current value of the current X to be passed through the sample 8 in the time interval including the time of the fusing (for example, the time interval of 60 seconds) For example, it has 2nd step S2 which acquires 0.4A). Therefore, the fusing test according to the embodiment can be performed if the current value of the current X flowing through the sample 8 and the time during which the current X flows through the sample 8 can be measured, and an expensive operation requiring a complicated operation such as an oscilloscope or the like. It is not necessary to use a simple measuring instrument. For this reason, an easy-to-implement fusing test method can be provided.

  Further, the fusing test according to the embodiment includes the third step S3 in which the fusing current value acquired in the second step S2 is passed through one or a plurality of other samples having the same material and shape as the sample 8, and this one or A fourth step S4 for measuring the fusing time until a plurality of samples are fused, and a fifth step S5 for judging whether or not the measured fusing time is within a time interval of 60 seconds. By determining in the fifth step whether or not the fusing time measured in the fourth step S4 is within the time interval of 60 seconds, the reproducibility of the fusing current value acquired in the second step S2 can be easily confirmed.

It is a figure which shows the structure of the fusing test apparatus which concerns on embodiment. It is a figure for demonstrating the fusing test method which concerns on embodiment. It is a figure for demonstrating the fusing test method which concerns on embodiment. It is a flowchart for demonstrating the fusing test method which concerns on embodiment. It is a figure which shows the result of the fusing test which concerns on embodiment. It is a figure which shows the result of the fusing test which concerns on embodiment. It is a figure which shows the result of the fusing test which concerns on embodiment.

Explanation of symbols

2 ... Electronic load device, 4 ... Control device, 6 ... Power source, 8 ... Sample, 10, 11 ... Fusing test device, 10a, 10b ... Metal plate pair, 12a, 12b ... Clip.

Claims (2)

A conductor fusing test method performed by passing a current through the conductor,
A first step of increasing a current value flowing through the conductor by a predetermined value every elapse of a predetermined time interval until the conductor is melted;
And a second step of acquiring the current value to be passed through the conductor in the time interval including the time of the fusing when the conductor is blown out. A third step in which the current value acquired in the second step flows through one or more other conductors having the same material and shape as the conductor;
The electric conductor fusing test method according to claim 1, further comprising a fourth step of measuring a time until the one or more electric conductors are fused after the third step.

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