JPS582287A - Ignition of gun powders and ignitor for initiation - 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 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, if the length of the resistor is less than IW, it becomes difficult to see it directly with the naked eye, making it almost impossible to manufacture it.

The igniter of the present invention is different from conventional ones such as jin,
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.

The drawing shows an insulating film or sheet 1 with metal foil 2.2 adhered to the front and back surfaces.
Each metal foil 2.2 is connected with a resistor 3.
shows a structure in which lead wires 4.4 are connected together.

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 is preferably 2 to 3+o+.

As for the metal foil, one made of conductive metal such as copper or aluminum is used. The adhesion of the metal foil to the film or sheet surface can be carried out by various conventionally known methods, and in addition to the method of surface adhesion of the metal film, metal vapor deposition methods, plating methods, etc. can also be employed.

The igniter of the present invention is advantageously manufactured using a photoetching 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) Negatives containing a large number of drawings of the desired shape are attached to both sides of this film, and both sides are exposed simultaneously or one side at a time.

(3) A method in which an exposed film is developed in solution and the unexposed areas or, conversely, the non-light areas are eluted. In this case, whether the exposed area or the non-exposed area is eluted depends on the type of photosensitive resin. In any case, it is sufficient that the elution area has a desired shape. Then, the metal foil on the lower surface is exposed in this elution part.

(4) Treat the metal part with a corrosive solution (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.

(6) Cut the film or sheet according to the pattern formed on the surface of the film or sheet, and connect the metal foils on both sides with a resistor such as platinum wire or tungsten wire to obtain the desired igniter.

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

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. It can be used as

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 111 Ill.
, 0.4 m in width. Of course, the igniter of the present invention can be applied in a larger size if necessary. The igniter of the present invention includes:
By making the structure minute, it can be advantageously applied as an igniter when blasting urinary stones with a small amount of gunpowder, but it can also be applied as an igniter in conventional detonators and fuzes. 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 polyimide resin film (thickness 0.2 mm) coated with copper foil 0.02 m thick on the front and back sides was coated with photosensitive resin paint on both copper foil surfaces to create a film. The same negative film was exposed to light at the same position on both sides, and then the unexposed areas were eluted and removed with a solvent to obtain a developed film in which a rectangular copper foil measuring 0.5 m x 3 m was exposed at the same position on both sides. This film was cut to obtain cut pieces having dimensions of 0.7 m x 4 m and having copper foil portions on both sides. Next, the aluminum foil portions on both sides of the cut pieces were connected with a platinum wire having a diameter of 0.02 m, and lead wires were connected to each aluminum foil portion. When the thus obtained igniter was used to ignite a trace amount of lead azide, it was confirmed that it could be reliably ignited.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing a structural example of the igniter of the present invention. 1... Insulating film or sheet, 2...
...Metal foil, 3...Resistor, 4...Lead wire. Sub-agent Patent Attorney Toshiaki Ikeura

Claims (1)

[Claims] (1) An explosive having a structure in which metal foils for connecting lead wires are adhered to the front and back sides of an insulating film or sheet, the metal foils are connected by a resistor, and a lead wire is connected to each metal foil. igniters for ignition and detonation of types.