US3732822A

US3732822A - Explosive encapsulated device

Info

Publication number: US3732822A
Application number: US00520547A
Authority: US
Inventors: F Thomanek
Original assignee: Individual
Current assignee: Individual
Priority date: 1966-01-12
Filing date: 1966-01-12
Publication date: 1973-05-15
Anticipated expiration: 1990-05-15

Abstract

An electrical structural unit comprises a plurality of electrical components which are arranged together in proper circuit orientation within a housing which is packed or filled around the electrical components with an insulating material which comprises an explsoive. A synthetic resin material is used to bound the explosive and in one embodiment the explosive is admixed with fillers such as a textile material, synthetic resins and glass fibers.

Description

Uited States Patent n 1 Thomanek 154] EXPLOSIVE ENCAPSULATED DEVICE [76] Inventor: Franz Rudolf Thomanek, Sandizell 38 5 1, Landkreis, Schrobenhausen, upper Bavaria, Germany [22] Filed: Jan. 12, 1966 [21] Appl. No.: 520,547

[52] U.S. Cl. ..l02/70.2 R, 174/52 PE [51] Int. Cl. ..F42b 1/00, F42b 13/48 [58] Field of Search ..102/70.2; 174/50,

l74/50.5, 52 PE [5 6] References Cited UNITED STATES PATENTS Bixby ..1o2 70.2

[113 3,732,822 1 May 15,1973

3,166,015 1/1965 Tuve et al.., ..l02/70.2

Primary Examiner-Verlin R. Pendegrass Attorney- McGlew & Toren [57] ABSTRACT An electrical structural unit comprises a plurality of electrical components which are arranged together in proper circuit orientation within a housing which is packed or filled around the electrical components with an insulating material which comprises an explsoive. A synthetic resin material is used to bound the explosive and in one embodiment the explosive is admixed with fillers such as a textile material, synthetic resins and glass fibers.

8 Claims, 1 Drawing Figure PATENTEU "W 51973 lnventor: FRANZ RUDOLF THOMHNEK B 7 MFA/Wi EXPLOSIVE ENCAPSULATED DEVICE SUMMARY OF THE INVENTION This invention relates in general to encapsulated electrical structures and in particular to a new and useful electronic or electrical structural unit having a plurality of interconnected electrical components embedded within an explosive material.

It is well known to encapsulate electronic structural units which include individual resistances, condensers, inductances, diodes, transistors and similar electrical elements which are interconnected in proper circuitry and encapsulated by means of an insulating material such as a plastic or resin. Such encapsulating materials usually effect two functions, that is, filling the space between the components and holding them in proper spatial relationship, and also to electrically insulate and separate the elements from each other. The space filling material should have electrical insulating qualities and also must provide means for fixing the relative position of the individual structural elements irrespective of any acceleration which may act on the unit, and also to protect the structural unit against atmospheric attacks. A rapidly polymerizing synthetic resin has been applied to such units under vacuum condition in order to prevent any hollow spaces from appearing within the unit and which would have a tendency to glimmer or glow after construction. The synthetic resins which are used for this purpose are customarily admixed with fillers, such as quartz meal and other mineral and fiber materials.

For certain fields of utilization of such electronic structural units, particularly in the aviation field and for flying bodies or missiles, there is a problem of arranging the electronic units within the flying body for the control and the guidance of the flying body and for the ignition of the explosive charge contained therein in such a manner that there remains sufficient space for the explosive charge. Preferably, the space for the explosive charge should be in the area of the flying body which is most suitable for its respective field of application or use.

Certain installations require that the electronic structural elements be accommodated at predetermined areas of the flying bodies such as where they must control the flight thereof for seeking out the target. Heretofore it has been necessary to include such units in the flying bodies at the expense of a reduction of explosive charge.

In accordance with the present invention, an encapsulated electronic or electrical unit is provided with explosives employed as an encapsulating material for filling the space between the electrical structural units. It has been found that most explosives are excellent electrical insulators. By providing a complete electronic package in this manner which includes explosives, it is possible to locate the electronic units in those areas within a flying body or missile at which the location is most desirable for the particular purpose and without any interference with the structural elements or the explosives contained in the device.

In accordance with the invention it is particularly advantageous if the explosive charges are of the kind which give off splinters. This is so because with the use of electronic structural units according to the invention, the entire flying body can be disassembled in a simple and safe manner. In addition, flying bodies which miss their target can be decomposed or deassembled into many small harmless parts, and this is of importance for anti-aircraft devices in particular.

Accordingly it is an object of the invention to provide an improved encapsulated electrical unit.

A further object of the invention is to provide an electrical unit which includes aplurality of interconnected electronic components embedded in an explosive material. 1

A further object of the invention is to provide an encapsulation structure which is simple in design, rugged in construction and economical to manufacture.

The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.

In the drawings:

The only FIGURE of the drawing is a perspective view, partly in section, of an electronic component for use in a flying body.

Referring to the drawing in particular, the invention embodied therein comprises an electronic unit which, for example, may be employed for controlling an operation of a flying body or missile and which includes, in the embodiment shown for example purposes, a resistor l, condenser 2, diode 3, transistor 4, and similar electronic components which are arranged together in an electronic unit 5 includes an encapsulation by an explosive material which is advantageously applied around the electronic components and thereafter permitted to harden. Such an electronic structural unit is comparable to an ordinary structural unit with the electrical components spaced apart and encapsulated with resins as in prior art arrangements.

It should be appreciated that the configuration of the unit 5 is, of course, adapted to the geometry of the particular space in which the unit is to be accommodated and also to the particular requirements which are to be met by the electronic units and the explosive charge.

Experiments have shown that the structural elements of the electronic unit, including the diode transistors, are insensitive in respect to the processing temperature of the explosive. In addition, the dielectric properties of the explosives which are used are so good that the electrical properties of the inventive unit are certainly comparable to those of the customary units which are filled with ordinary insulating materials. However, in the event that differing electric constants of resin and explosive should influence particularly sensitive electronic structural units in respect to the function of the latter, then this can be considered by particularly arranging the structural elements within the circuit. It is also recommended in the event ofextraneous materials, for example in respect to electrical elements which give off gas, to coat these elements prior to the casting or filling with the explosive with a protective film 7, preferably a lacquer layer of small thickness.

For a space filling and an encapsulating material, an explosive of high explosive bound'with synthetic resin is preferably employed. An explosive may be used which consists of a multiple nitro body and highly explosive crystal admixtures. Preferably the explosive material should be secured against crack formations in its hardened phase by suitable additions, as, for exam ple, mononitronaphtalin or substances which have similar action. In some instances it is desirable to admix explosive material with textile filler, synthetic resins or glass fiber fillers in order to improve its drawabilityv With certain electronic structural elements as, for example, condensers, it is advantageous to coat them with a neutral protecting lacquer of small layer thickness in order to thereby prevent disadvantageous reaction between the explosive and the structural elements and which may give off gas and moisture.

While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

What is claimed is:

1. An electrical structural unit comprising a plurality of electrical components arranged together in proper circuit orientation, and an insulating material filling the space between said electrical components, which insulating material is an explosive.

2. An electrical structural unit according to claim 1,

including a synthetic resin material bounding the explosive.

3. An electrical structural unit according to claim 1, wherein said explosive includes a meltable component and a crystallized component.

4. An electrical structural unit according to claim 1, wherein said explosive includes additions such as mononitronaphtalin.

5. An electrical structural unit according to claim 1, wherein said explosive includes admixtures of materials to prevent crack formation after the explosive has hardened.

6. An electrical structural unit according to claim 1, wherein said explosive is admixed with fillers such as textile material, synthetic resins and glass fibers.

7. An electrical structural unit according to claim 1, wherein the individual electrical structural elements are coated with a neutral protective film.

8. An electrical structural unit according to claim 1, wherein the individual electrical units and said explosive are arranged in a configuration adapted to the respective use to which the explosive is to be put.

Claims

2. An electrical structural unit according to claim 1, including a synthetic resin material bounding the explosive.
3. An electrical structural unit according to claim 1, wherein said explosive includes a meltable component and a crystallized component.
4. An electrical structural unit according to claim 1, wherein said explosive includes additions such as mononitronaphtalin.
5. An electrical structural unit according to claim 1, wherein said explosive includes admixtures of materials to prevent crack formation after the explosive has hardened.
6. An electrical structural unit according to claim 1, wherein said explosive is admixed with fillers such as textile material, synthetic resins and glass fibers.
7. An electrical structural unit according to claim 1, wherein the individual electrical structural elements are coated with a neutral protective film.
8. An electrical structural unit according to claim 1, wherein the individual electrical units and said explosive are arranged in a configuration adapted to the respective use to which the explosive is to be put.