JPH01189500A - Ignition device for electric detonator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an ignition device for an electric detonator using a membrane resistor as a heating element.

<Prior art> In the ignition device of an electric detonator, an electric bridge made of ultrafine wire of several microns to several tens of microns made of platinum, platinum alloy, etc. is used as a heating element, and the structure of the ignition device including the electric bridge is It is known that the electric bridge is embedded inside the ignition ball or the ignition powder cup container. As for electronic delay detonators, there is also known an ignition device having a structure in which a platinum wire is externally attached to a support substrate provided inside the detonator tube, as described in Japanese Patent Publication No. 51-12683.

Recently, a large amount of phosphorus is dispersed and doped into a silicon element to form an H-type electric bridge part, and when the ignition charge is squeezed against the electric bridge and a current is passed, the dope generates plasma and the ignition charge is The semiconductor electric bridge that ignites is the National Cab.
, C & EN Mar, 9.1987 p13.

<Problems to be solved by the invention> An ignition device that uses a thin filament as a heating element requires a complicated process during manufacturing, and installation on a bare part of the electrical layer is likely to cause defects, such as electrical bridge breakage and abnormalities. Special care was required in terms of quality control, such as resistance value.

Furthermore, after the product is manufactured, problems such as wire breakage and resistance changes are likely to occur during transportation and handling, and this problem was extremely important for the ignition system of the electronic delay detonator, which requires particularly high timing accuracy. .

Concerning the semiconductor electric bridge, the specific details are not known, and although it has meaning in the laboratory, there are some aspects that are not clear from an industrial perspective.

The present invention provides an ignition device that fundamentally eliminates the problems of the above-mentioned filament bridge ignition device and uses a membrane resistor as a heating element.

<Means for Solving the Problems> The present invention is an ignition device for an electric detonator in which electrodes are bridged by a membrane resistor as a heating element. This is an ignition device for an electronic electric detonator, which supports an integrated circuit and has an energy storage capacitor and an input leg for supplying electric energy arranged between electrodes in parallel with a membrane resistor.

The film resistor of the present invention includes, for example, Cr, Ni-Cr, Rub
, Ta, Tag, AI, Au.

It is made of a resistive material of metal such as Cu, Pd, or its oxide, and is used to generate heat through ohmic current to ignite the igniter around the resistive material.The resistive material may be ceramic, glass epoxy, It is manufactured into a chip shape by screen printing, sputtering, vacuum evaporation, etc. on a substrate such as epoxy, and the resistance value of the finished product is approximately Thickness,
Several microns to several tens of microns, area, 0. IXo, 2M
, the resistance value is preferably about 0.5 to 2.0a.

Note that copper foil, nickel foil, etc. are applied to both sides of this chip, and it is important to design the chip so that it can be easily connected to the electrode portion by soldering or the like.

FIG. 1 shows a sparkball-type embodiment of the invention using a membrane resistor as a heating element.

In Figure 1 (a) is a side view and Figure 1 (bl is a plan perspective view), 1 is a plastic embolus that is fitted into the tube body of the electric detonator, and (2) is a plastic embolus that is integrated with the embolus. The molded leg line and the front end surface of the ignition ball fixing part are the base surface of the membrane resistor. (3) is the leg line, and the exposed ends of the leg line on the ignition ball side (3a), (3b) is an electrode part which is bent or cut along the upper surface of the ignition ball fixing part.A chip-shaped membrane resistor (4) is bonded to the electrode part.(5) is a ball-shaped film resistor (4). It is an ignition powder, and (6) is an ignition powder protective film.

FIG. 2 shows a sparkball-type embodiment of the igniter for an electronic delay detonator according to the invention, using a membrane resistor as a heating element. FIG. 2+a) is a side view, FIG. 2(b) is a plan perspective view, and FIG. 2(C) is a plan perspective view showing a method of manufacturing the membrane resistor. In the figure, (8) is the substrate, (9) is the electronic delay integrated circuit, 0 is the energy storage capacitor, αU is the electrical conductor path, the side is the undercoat material, Q3) is the resistive material, and (b) is the overlay. It is a coat material.

The substrate (8) here is made of a material such as ceramic, glass epoxy, or epoxy, and its surface is
In order to facilitate the mounting of electronic delay timer circuit components and the connection of input leg wires and ignition parts, printed wiring conductor paths aυ are pre-coated with Au, Cu, Ni, etc. On the output side of the electrode part (3a), (3b
), and a chip-shaped film resistor (4) is bonded thereto. (5) is a ball-shaped ignition powder, and (6) is an ignition powder protective film.

Figure 2 (C) shows a manufacturing method in which a film resistor is built directly onto a printed circuit board (8). Glass paste or the like is screen printed to serve as an undercoat material (support), and the resistor is formed after baking. Material (13) is cermet screen printed to form an electrode part (3a).

(3b), and after firing, finish by firing again as an overcoat material Q4) using glass paste or the like.

FIG. 3, like FIG. 2, shows an embodiment of an ignition device for an electronic delay electric detonator in the form of a sparkball. The ignition ball in Fig. 2 is hemispherical, while the ignition ball in Fig. 3 is spherical.
This structure has a structure in which a notch is formed in a portion of the substrate (8) near the membrane resistor (4) to facilitate the formation of a spherical shape. The chip-shaped film resistor may be added later, or may be fabricated in advance as shown in FIG. 2(C).

In any case of FIG. 1, FIG. 2, or FIG. 3, the film resistor (4
) is brought into contact with an appropriate amount of wet ignition powder in a dip method, dried, and then a protective film is applied to the ignition powder.

FIG. 4 shows an embodiment of the cup-type ignition device of the present invention using a membrane resistor as a heating element. FIG. 4(a) is a side view, and FIG. 4(bl) is a plan perspective view.

(2) is a leg line (3) and a cup fixing part integrally molded with the embolus (1), (7) is a bottomed cup attached to the outer periphery of the cup fixing part (2), and (5) ) is the igniter filled in the bottomed cup. The ignition powder (5) is a dry ignition powder, which is directly measured and filled into the bottomed cup and attached to the embolus with a membrane resistor.

Effect〉 According to the ignition device of the present invention, FIGS. 1 and 2.

When ignition powder (concentrated powder) is applied to form a sparkball shape as shown in Figure 3, or when combined with a cup containing ignition powder (dry powder) as shown in Figure 4, electric This solves the problem of electric bridge breakage caused by thermal contraction/expansion, friction, impact, etc. applied to the bridge portion from outside, such as ignition powder.

Furthermore, when a chip-shaped film resistor was mounted on the substrate or directly fabricated as the ignition device for the electronic delay electric detonator shown in Figure 2, it became possible to incorporate the ignition part into the series of manufacturing processes of the substrate. As a result, manufacturing time can be shortened, work efficiency can be improved, and costs can be expected to be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view (a) and a plan perspective view (b) showing an embodiment of an igniter type according to the present invention. FIG. 2 and FIG. 3 are a side view (al) showing an ignition ball type embodiment of the ignition device for an electronic delay electric detonator of the present invention, a plan perspective view (b), and a manufacturing mode of a membrane resistor, respectively. Plane perspective view (
C). FIG. 4 is a side view (a) and a plan perspective view (b) showing an embodiment of the force/knob type ignition device of the present invention. 1...Emboli 2...Ignition ball fixing part 2...Cup fixing part 3...Leg lines 3a, 3b Old...Electrode part 4... ... Membrane resistor 5 ... Ignition powder 6 ... Ignition protection film 7 ... Bottomed cup 8 ... Substrate 9 ... ...Energy storage capacitor 11 for electronic delay integrated circuit 10...
- Electrical conductor path 12... Undercoat material 13... Resistance material 14... Overcoat material Patent applicant Asahi Kasei Corporation Figure 3 (G) (b) 5゜Figure 4 (Q) (b) n~! Procedural amendment (method) March 1999 Director General of the Japan Patent Office Yoshi 1) Takeshi Moon 1, Indication of the case 1988 Patent Application No. 259768 2, Name of the invention Ignition device for electric detonator 3, Make amendments Patent applicant: 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture (003) Asahi Kasei Kogyo Co., Ltd. 4. Date of amendment order 1999 2 Drawing 6, Contents of amendment (1) Statement on page 8, lines 10 to 13 of the specification “Second
3 and 3 are plane perspective views (C
). ” is corrected as follows. "Figure 2 is a side view (a) showing an ignition ball type aspect of the ignition device for an electronic delay electric detonator of the present invention, a plan perspective view (b), and a plan perspective view showing the manufacturing mode of the membrane resistor. (C). Fig. 3 is a side view (a) and a plan perspective view showing another embodiment of the ignition ball type of the present invention." (2) As shown in the attached drawing in the drawing appendix ( (Amendment to correct the description of “utility model registration applicant” to “patent applicant”)

Claims (2)

[Claims] (1) An ignition device for an electric detonator in which the electrodes are bridged by a membrane resistor as a heating element. (2) For an electric detonator, in which an integrated circuit for delay time is supported on a substrate having an electric conductor path, and an energy storage capacitor and an input leg for supplying electric energy are provided between the electrodes in parallel with a membrane resistor. Ignition device.