Ignition device for pyrotechnic microcharges

• US 20030010243A1
• Filed: 06/20/2002
• Published: 01/16/2003
• Est. Priority Date: 07/13/2001
• Status: Active Grant

• Current Assignee: Herakles
• Original Assignee: SNPE
• Inventors: Roller, Denis
• Granted Patent: US 6,666,140 B2
• Time in Patent Office: Days
• US Class Current: 102/202.5
• CPC Class Codes: F42C 19/085 Primers for caseless ammunition
• CPC Class Codes: F42C 19/12 electric

Abstract

The technical field of the invention is that of devices for igniting pyrotechnic charges, and more specifically those suitable for small pyrotechnic charges which can be found in microsystems such as microvalves or micropumps.

The subject of the present invention therefore relates to a device for igniting a solid pyrotechnic charge, comprising a heating device. The main characteristic of this ignition device is that the heating device is a conducting track (2) obtained by depositing a conducting ink on the pyrotechnic charge (1), it being possible for this deposition to be carried out by screen printing or by inkjet.

Claims

1. Device for igniting a solid pyrotechnic charge (1), comprising a conducting track (2), characterized in that the said track consists of a conducting fluid deposited at least partially on the pyrotechnic charge and in that the said pyrotechnic charge (1) is deposited on a solid support (3) and covers a cavity of this support (3).

2. Ignition device according to claim 1, characterized in that the conducting fluid is deposited by screen printing.

3. Ignition device according to claim 1, characterized in that the conducting fluid is a conducting ink and the conducting track (2) is produced by jet-spraying the said ink.

4. Ignition device according to claim 1, characterized in that the conducting track (2) is only in contact with the pyrotechnic charge (1).

5. Ignition device according to claim 1, characterized in that the pyrotechnic charge (1) is in the form of a film.

6. Ignition device according to either of claims 1 and 5, characterized in that the pyrotechnic charge (1) is based on nitrocellulose.

7. Method of producing a device for igniting a pyrotechnic charge, according to claim 1, characterized in that the conducting fluid is deposited directly on the pyrotechnic charge.

8. Method according to claim 7, characterized in that the deposition is carried out by screen printing.

9. Method according to claim 7, characterized in that the conducting fluid is a conducting ink and the deposition is carried out by jet-spraying the said ink.