JP3860900B2 - Ignition heating tool and igniter - Google Patents

Description

【００２１】
この表から明らかなように、比較品は電源Ｖの出力電圧が１０〜２５Ｋｖになると点火薬剤が発火したが、本発明品は、試験１、試験２とも点火薬剤が発火することはなく、静電気性能の向上が認められた。
【００２２】
一方、本発明について発火感度の確認試験を行った。試験は通電時間を一定として、定電流発生装置を用いて通電電流値を変化させ、最小発火電流値を測定した。その結果、本発明品は１．０２Ａ、同様のテストで比較品の最小発火電流値は１．０５Ａであり、放電ギャップを設けても発火感度は変化しないことがわかった。
【００２３】
【発明の効果】
以上、詳細に説明したように本発明の点火具では、保管中や輸送中に発生する静電気は放電してしまうので、不測の暴発事故を防止でき、きわめて安全である。しかも、その対策が発熱抵抗に影響を及ぼすことはないので発火感度を良好に保つことができる。また静電気が発熱抵抗を通じて放電されることがなくなるので、発熱抵抗の自然劣化を防ぐことができる。
【００２４】
また本発明の点火用発熱具では、静電気対策のため発熱抵抗の発熱面積を大きくする必要がなくなったため小型化を達成できるようになった。しかもその静電気対策である放電ギャップの形成は様々な形状の基板に応用でき、量産性に優れたものである。
【図面の簡単な説明】
【図１】本発明を適用する点火用発熱具の基板の図である。
【図２】本発明を適用する本発明の点火具の外観図である。
【図３】試作品の静電気性能を試験するための試験回路図である。
【符号の説明】
１は基板、２ａ・２ｂは電極ピン、３は発熱抵抗体、４ａ・４ｂは凹部、５は放電ギャップ、６ａ・６ｂ導体、８は点火薬剤、Ｃはコンデンサー、Ｒは放電抵抗、Ｖはテスト電源である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an igniter for igniting various pyrotechnics, and an ignition heating tool used for the igniter.
[0002]
[Prior art]
A gas generator is used as a drive source for various devices that require a large amount of power instantaneously, such as a seat belt for an automobile, an air bag, and space. A gas generator, which is a pyrotechnic, includes a gas generating agent and an igniter for burning it. The igniter is composed of a heating resistor connected to a power source and a small amount of igniting chemical in contact therewith. A conventional igniter is disclosed in, for example, JP-A-8-210639.
[0003]
If a static current flows through the heating resistor of the igniter, it will lead to an accident. Therefore, conventionally, the heat generation area of the heat generation resistor is increased to disperse the heat generation, and a very small current such as electrostatic energy does not generate heat up to the ignition temperature of the ignition chemical.
[0004]
[Problems to be solved by the invention]
However, as with conventional igniters, suppressing heat generation due to electrostatic energy below the ignition temperature of the ignition agent means desensitizing the igniter's sensitivity, and improving antistatic performance and improving ignition sensitivity The results were in conflict. Furthermore, although conventional igniters have the above-mentioned countermeasures against static electricity, the generated static electricity is discharged through a heating resistor, so if this is repeated, a heating resistor (mostly a bridge or printed resistor) Deterioration was inevitable, and the discharge was indeterminate due to the presence and shape of burrs and whiskers that occurred during welding of the bridge and during resistance adjustment trimming of the printed resistance, and the electrostatic performance was not stable. Further, since the heat generation is dispersed by increasing the heat generation area, the heat generation resistance is increased, which in turn contributes to the increase in the size of the igniter.
[0005]
The present invention has been made to solve the above-described problems. In providing an ignition tool that is highly safe by preventing an accident due to static electricity and a heating tool for ignition used in the ignition tool, the ignition sensitivity is maintained. The purpose is to stabilize the electrostatic performance without deteriorating the heating resistance and to achieve miniaturization.
[0006]
[Means for Solving the Problems]
The present invention made to achieve the above object will be described with reference to the drawings corresponding to the embodiments.
[0007]
As shown in FIG. 1, an ignition heating tool to which the present invention is applied has a pair of conductors 6a and 6b that are electrically connected to a pair of electrode pins 2a and 2b (see FIG. 2) formed on a ceramic substrate 1, respectively. On one side A of the substrate 1, the pair of conductors 6a and 6b are connected by the heating resistor 3, and on the other side C, the pair of conductors 6a and 6b that have passed through the ceramic substrate 1 are opposed to each other by the through-holes. characterized in that it forms a.
[0008]
It can be implemented appropriately when the discharge voltage of the discharge gap is 5 to 30 Kv.
[0009]
Further, in the igniter to which the present invention is applied, a pair of conductors 6a and 6b respectively conducting to the pair of electrode pins 2a and 2b are formed on the ceramic substrate 1 as shown in FIGS. conductors 6a and 6b of the pair in one side a is connected with the heating resistor 3, the conductor 6a and 6b of the pair passing through the ceramic substrate to form a discharge gap 5 so as to face the other surface C in the through hole, An ignition chemical 8 is disposed in contact with the heating resistor 3.
[0010]
In the ignition heating device of the present invention and the ignition device using the same, static electricity is discharged in the discharge gap 5. Static electricity is a high voltage but has a small capacity, so it discharges in a very short time. Although the electrostatic discharge current also flows through the heating resistor 3, it discharges in a very short time, so that it does not generate heat and the ignition chemical 8 does not ignite. The formed discharge gap 5 is in parallel with the heating resistor 3, and the resistance value in the power supply voltage region for ignition can be regarded as infinite compared to the heating resistor 3, and therefore flows through the heating resistor 3. Does not affect the operating current.
[0011]
If the discharge voltage of the discharge gap is too lower than the above range, the operating voltage for ignition may be discharged, and if it is too high, the static electricity may not be fully discharged.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a diagram illustrating a substrate 1 of an ignition heating tool to which the present invention is applied, with an upper surface A, a central section BB, and a lower surface C drawn. The substrate 1 is made of a ceramic insulator and has a pair of recesses 4a and recesses 4b. The conductor 6a and the conductor 6b are formed of, for example, a silver-palladium conductive material on the inside and the periphery (the upper surface A and the lower surface C) of the pair of recesses 4a and 4b. On the upper surface A of the substrate 1, the heating resistor 3 is stretched over the conductor 6a and the conductor 6b. On the lower surface B, the conductor 6a and the conductor 6b are not connected and form a discharge gap 5.
[0014]
The electrode pin 2a and the electrode pin 2b (see FIG. 2) are inserted into the pair of recesses 4a and 4b of the substrate 1, respectively, connected to the conductors 6a and 6b, respectively, and conductive, thereby completing the ignition heating tool. ing.
[0015]
FIG. 2 is an external view of an igniter to which the present invention is applied. An igniting agent 8 mainly composed of trinitronesolcin lead is attached so as to cover the heating resistor 3 of the ignition heating tool. Furthermore, the electrode pin 2a and the electrode pin 2b are connected to a power source (not shown). The igniter is incorporated in a pyrotechnic such as a gas generator.
[0016]
The substrate 1 of the ignition heating tool is manufactured as follows.
[0017]
An alumina green sheet having a size of 120 pieces provided with holes corresponding to the recesses 4a and 4b of the pair, and a grid-like groove for breaking a large plate and separating each substrate 1 Molded and fired. The conductor 6a and the conductor 6b are printed by screen printing on both surfaces (upper surface A and lower surface C) of this large substrate. On the lower surface C side, the conductors 6a and 6b are printed in the pattern of the discharge gap 5, and the conductors 6a and 6b are also formed inside the holes corresponding to the recesses 4a and 4b by the through holes. After baking this, the heating resistor 3 is printed on the upper surface A side across the conductors 6a and 6b by screen printing, and then fired. The large substrate having the circuits formed on both sides in this way is folded along the grid and divided into individual substrates 1. The discharge gap 5 may be adjusted for discharge voltage by laser trimming after printing and firing the conductors 6a and 6b.
[0018]
A prototype of the igniter according to the present invention, in which the gap of the discharge gap 5 was 0.25 mm and the discharge voltage was adjusted to 5 Kv, was tested for electrostatic performance using the test circuit shown in FIG. For comparison, a test piece without a discharge gap (having the conductor on the surface C cut off) was made and tested in the same manner.
[0019]
Test 3 for the three prototypes of the present invention and three prototypes for comparison, the capacitor C of the test circuit of FIG. 3 is set to 500 pF, the discharge resistance R is set to 5 KΩ, the prototype is connected, the switch S is inserted, and the test power supply The output voltage of V was gradually increased, and whether or not the ignition chemical was ignited and when it was ignited, the voltage was observed. In the same manner as Test 2, the capacitor C was 150 pF and the discharge resistance R was 150Ω. The results are as shown in the table below.
[0020]
[Table 1]

[0021]
As is apparent from this table, the comparative product ignited the ignition agent when the output voltage of the power source V became 10 to 25 Kv, but the product of the present invention did not ignite the ignition agent in both test 1 and test 2, An improvement in performance was observed.
[0022]
On the other hand, an ignition sensitivity confirmation test was performed on the present invention. In the test, the energization time was fixed, the energization current value was changed using a constant current generator, and the minimum ignition current value was measured. As a result, the product of the present invention was 1.02A, the minimum ignition current value of the comparative product was 1.05A in the same test, and it was found that the ignition sensitivity did not change even if a discharge gap was provided.
[0023]
【The invention's effect】
As described above in detail, in the igniter of the present invention, static electricity generated during storage or transportation is discharged, so that an unexpected accident can be prevented and it is extremely safe. In addition, since the countermeasure does not affect the heating resistance, the ignition sensitivity can be kept good. In addition, since static electricity is not discharged through the heating resistor, natural degradation of the heating resistor can be prevented.
[0024]
In addition, the ignition heating tool of the present invention can be reduced in size because it is not necessary to increase the heat generation area of the heat generation resistor in order to prevent static electricity. In addition, the formation of the discharge gap, which is a countermeasure against static electricity, can be applied to substrates of various shapes and is excellent in mass productivity.
[Brief description of the drawings]
FIG. 1 is a diagram of a substrate of an ignition heating tool to which the present invention is applied.
FIG. 2 is an external view of an igniter according to the present invention to which the present invention is applied.
FIG. 3 is a test circuit diagram for testing the electrostatic performance of a prototype.
[Explanation of symbols]
1 is a substrate, 2a and 2b are electrode pins, 3 is a heating resistor, 4a and 4b are recesses, 5 is a discharge gap, 6a and 6b conductors, 8 is an ignition agent, C is a capacitor, R is a discharge resistance, and V is a test. It is a power supply.

Claims (3)

A pair of conductors respectively conducting to the pair of electrode pins are formed on the ceramic substrate, the pair of conductors are connected by a heating resistor on one side of the ceramic substrate, and the ceramic substrate is connected by a through hole on the other side. ignition heating tool conductors of the pair that has passed is characterized in that it forms a discharge gap facing.     The ignition heating tool according to claim 1, wherein a discharge voltage of the discharge gap is 5 to 30 Kv. A pair of conductors respectively conducting to the pair of electrode pins are formed on the ceramic substrate, the pair of conductors are connected by a heating resistor on one side of the ceramic substrate, and the ceramic substrate is connected by a through hole on the other side. igniter conductor of said pair of passes are opposed to form a discharge gap, characterized in that the ignition agent in contact with the heat generating resistor is disposed.

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