JPS582699B2 - Igniters for igniting and detonating explosives - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an igniter used for igniting and detonating explosives.

There is a known method for removing urinary tract stones present in organs by blasting and pulverizing them with explosives, but since the igniter used in such a crushing device is inserted into the narrow urethra, its structure is microscopic. is required.

A conventional igniter that meets these requirements is one in which the tips of two lead wires are connected with a fine and extremely short resistor (eg, platinum wire, nichrome wire, etc.).

However, in the igniter having such a structure, since the resistor is thin and short, it is extremely difficult to connect it to the tip of the lead wire.

In particular, when the length of the resistor is less than 1 month, it becomes difficult to see it directly with the naked eye, making it almost impossible to manufacture it.

The igniter of the present invention differs from such conventional ones,
It is easy to manufacture, has high ignition reliability, and has a structure suitable as a micro-igniter.

An example of the structure of the igniter of the present invention is shown in the drawings.

In the drawing, a metal foil 2 is adhered to the surface of an insulating film or sheet 1, and the middle part of the metal foil is a resistor 3.
The structure is shown in which lead wires 4, 4 are connected to both ends 2, 2 of the metal foil.

Figure a shows an example where the middle part of the metal foil becomes a point-like narrow body 3 to form a resistor. Figure b shows an example in which a circular-shaped perforation is provided in the middle part of the metal foil, and the edges thereof become narrow bodies 3, 3 to form a resistor, and figure C shows a hole in the middle part of the metal foil. An example in which a rectangular perforation is provided and the edges thereof become narrow bodies 3, 3 to form a resistor, and in Figure d, the middle part of the metal foil becomes a band-shaped narrow body 3 to form a resistor. Give an example.

The insulating film or sheet 1 used in the present invention includes a metal foil 2
Generally, synthetic resin, glass, ceramic, earthenware, and other insulating materials are used.

The thickness of the film or sheet 1 is preferably 2 to 3 mm or less.

Further, as the metal foil, one made of a conductive metal such as copper or aluminum is used.

The metal foil can be bonded to the film or sheet surface by various conventionally known methods, and in addition to the method of bonding the metal film to the surface, a metal vapor deposition method, a plating method, etc. can also be employed.

The igniter of the present invention is advantageously manufactured using a photo-etching technique using a photosensitive resin, and is manufactured, for example, as follows.

(1) A photosensitive resin liquid is applied to the metal foil surface of a large synthetic resin film with a metal foil adhered to the surface to form a photosensitive resin film.

(2) A negative containing many drawings of the desired shape is placed on top of this film and exposed.

(3) The exposed film is subjected to solution development, and the unexposed areas or, conversely, the exposed areas are eluted.

In this case, whether the exposed areas are eluted or the non-exposed areas are completely eluted depends on the type of photosensitive resin.

In any case, it is sufficient that the elution area has a desired shape.

Then, the Kanagawa leaf on the lower surface is exposed in this elution part.

(4) Treat the metal part with an etching solution to elute the metal in that part.

Thereafter, the photosensitive resin film on the surface is removed using a stripping solution.

(5) Connect the lead wire to the metal foil portion by adhesive or welding.

In this case, to connect the lead wire to the metal foil, drill a pore at a predetermined location in the film or sheet, insert the lead wire through the pore from the back side to the front surface, and connect the tip of the lead wire to the metal foil. It can also be done by connecting to.

(6) Film or sheet 1 - Cutting the film or sheet according to the pattern formed on the surface.

In this way, a large number of desired igniters can be obtained at once.

Note that this cutting can also be performed prior to the connection of the lead wires in (4) above.

Further, when perforating the film, it can be performed before or after this cutting.

The shape of the film or sheet 1 forming the metal foil support may be arbitrary, and may be rectangular, circular, annular, triangular, etc.

The film-shaped igniter according to the present invention can be used as is by being attached to gunpowder, and if the material is a flexible film, it can be bent vertically and horizontally, so it can be bent appropriately. Can be used.

For example, in the case shown in Figure b, the metal foil is bent along chain line A so that the metal foil is on the outside, and then it is folded along chain line B.

In this way, it is possible to obtain an igniter whose entire shape is band-shaped or rod-shaped, and whose size is reduced.

The igniter according to the present invention is preferably entirely covered with an insulating material, except for the resistor portion, in order to prevent electrical leakage when it comes into contact with other metal objects.

The igniter of the present invention can have an extremely small structure, for example, the entire length is 1 mm and the width is 0.5 mm. It can have dimensions of 4 mm.

Of course, the igniter of the present invention can be made larger in size if necessary.

Since the igniter of the present invention has a minute structure, it can be advantageously applied as an igniter when blasting urinary stones with a small amount of gunpowder, but it can also be used as an igniter in conventional detonators and fuzes. can do.

It is also suitable as a firearm fuse igniter. Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A photosensitive resin liquid was applied onto the surface of a polyimide resin (thickness: 0.2 mm) coated with a copper foil of a thickness of 0.02 mm to form a film, and a film was formed on the surface of the polyimide resin (thickness: 0.2 mm). A negative of the wedge pattern was placed and exposed, and then the non-exposed area was eluted and removed with a solvent to obtain a developed film in which the copper foil part of the wedge pattern shown in figure a was exposed on the surface.

Next, this film was cut into pieces of 1 mm. A cut piece with a size of 1 mm was obtained.

The total length of the wedge shape formed therein was 0.7 mm.

Furthermore, the accuracy of the resistance value of the wedge pattern in the large number of cut pieces obtained by this cutting is 1.2±0.1Ω, which shows very little variation.

Next, lead wires were adhered to both ends of the copper foil portion of the cut piece, and the entire piece was coated with an insulating paint except for the resistor portion 3.

In the igniter thus obtained, the surface of the resistor portion 3 is coated with 0.00% tricinate gunpowder. When we prepared five pieces with 5 mg of gunpowder attached to them and caused them to fire at the same time through a lead wire, there was almost no variation in time, and these five pieces ignited at the same time. It has been confirmed that you can get it.

Example 2 A photosensitive resin was applied onto an aluminum foil made of polyimide resin (thickness: 0.17 mm) whose surface was coated with aluminum foil having a thickness of 0.05 mm to form a film.

Using this product, a cut piece having the aluminum foil pattern shown in Figure b was obtained in the same manner as in Example 1.

The dimensions of this cut piece are 1 mm x 12 mm, and the dimensions of the aluminum foil portion formed on its surface are 0. 5 mm×
8 mm (there is a straight line in the center of this aluminum foil part)
．． 35mm resin part strength.

Next, the central circular resin part of this cut piece was punched out to obtain a cut piece having a 0.35 mm diameter pore in the center of the aluminum foil.

Next, connect lead wires to both ends of the aluminum foil part of this cut piece, and connect it to the chain shown in figure b. It was bent along line A with the aluminum foil section facing outward, and the entire structure was coated with insulating paint, leaving only the resistor section.

When a trace amount of lead azide was ignited using the igniter thus obtained, it was confirmed that the igniter could be reliably ignited.

[Brief explanation of the drawing]

Figures a to b are explanatory diagrams each showing a structural example of the igniter of the present invention. 1... Insulating film or sheet 1., 2... Metal foil. 3...Resistor, 4...Lead wire. 5...Drilling hole.

Claims (1)

[Claims] 1. On the surface of an insulating film or sheet, a metal foil having a narrow middle part and forming a resistor is adhered, and
An igniter for igniting and detonating explosives, which has a structure in which lead wires are connected to both ends.