# US 5,706,180 A · Electronic device protected from shocks by encapsulation

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- Number: US 5,706,180 A
- Document ID: US5706180A
- Status: Granted
- Kind: A
- Application number: 08/642,882
- Filed: 1996-05-06
- Granted: 1998-01-06
- Earliest claimed: 1995-05-18
- Assignees: Aerospatiale Societe Nationale Industrielle
- Inventors: Marc Lacroix; Claude Bouyon
- Web page: https://patentgrep.com/patent/US5706180A

## CPC

- H05K 3/284: {for encapsulating mounted components (H05K1/185 takes precedence)}
- H05K 7/1434: {for electronics exposed to high gravitational force; Cylindrical housings}
- H05K 1/14: Structural association of two or more printed circuits (providing electric connection to or between printed circuits H05K1/11, H01R12/00)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An electronic device (1) includes a set of boards (2) carrying electronic components (3). The boards are mounted so as to be separated from and parallel to one another. The electronic device (1) is capable of withstanding shocks in a defined direction approximately orthogonal to the planes of the boards (2). The electronic device (1) also includes a protective body (5) made of an elastomeric substance encapsulating the set of boards (2). The elastomeric substance fills the spaces between the boards (2) and forms at least one front shield (6), in the direction of the shocks (E) for the set of boards (2).

## Claims

### Claim 1

An electronic device comprising a set of boards (2) carrying electronic components (3), said boards being mounted so as to be separated from and parallel to one another, said electronic device (1) being capable of withstanding shocks in a defined direction approximately orthogonal to the planes of said boards (2),
which comprises a protective body (5) made of an elastomeric substance encapsulating said set of boards (2), said elastomeric substance filling the spaces between said boards (2) and forming at least one front shield (6), in the direction of the shocks (E), for said set of boards (2), said front shield (6) of said protective body (5) having a peripheral conical recess (8) intended to allow expansion of the elastomeric substance during a shock.

### Claim 2 (depends on 1)

The electronic device as claimed in claim 1, wherein said elastomeric substance forms a rear shield (7), in the direction of the shocks (E), for said set of boards (2).

### Claim 3 (depends on 2)

The electronic device as claimed in claim 2, wherein said rear shield (7) of said protective body (5) has a peripheral recess (9).

### Claim 4 (depends on 1)

The electronic device as claimed in claim 1, wherein said protective body (5) has a cylindrical general shape.

### Claim 5 (depends on 1)

The electronic device according to claim 1, wherein said protective body (5) has a parallelepipedal general shape.

### Claim 6 (depends on 1)

The electronic device as claimed in claim 1, wherein silicone is used as the elastomeric substance.

### Claim 7 (depends on 1)

The electronic device as claimed in claim 1, wherein said elastomeric substance is at least partially transparent.

### Claim 8 (depends on 1)

The electronic device as claimed in claim 1, which comprises at least one honeycomb auxiliary piece (13) mounted in front of the protective body (5) in the direction of the shocks (E).

### Claim 9 (depends on 1)

The electronic device as claimed in claim 1, wherein said protective body (5) is surrounded by a rigid casing (10).

### Claim 10 (depends on 9)

The electronic device as claimed in claim 9 wherein said rigid casing (10) is made of a composite.

### Claim 11 (depends on 9)

A process for producing the electronic device (1) specified in claim 9, wherein:
said set of boards (2) is inserted into said rigid casing (10) provided with openings (12) which are distributed along its longitudinal direction;
the ends of said rigid casing (10) are plugged;
an elastomeric substance is poured into said rigid casing (10) through said openings (12) so that said elastomeric substance encapsulates said set of boards (2) and fills the spaces between said boards (2); and
said elastomeric substance solidifies, thus forming said protective body (5) and at least said front shield (6).