Systems and methods for illuminating a spark gap in an electric discharge weapon

• US 7,336,472 B2
• Filed: 09/30/2004
• Issued: 02/26/2008
• Est. Priority Date: 09/30/2004
• Status: Active Grant

• Current Assignee: Axon Enterprise, Inc.
• Original Assignee: Taser International Incorporated
• Inventors: Carver, Matthew T., Shekarri, Nache, Nerheim, Magne H., Markle, Ryan C.
• Primary Examiner(s): Leja; Ronald W.
• Application Number:
  US10/957,315
• Publication Number:
  US 20060072280A1
• Time in Patent Office: 1,244 Days
• Field of Search: 361/232
• US Class Current: 361/232
• CPC Class Codes: F41B 15/04 with electric stunning-means ejecting electrically charged liquid jets F41B9/00; electric shock creating harpoons F42B30/14; electric circuits or apparatus for killing or stunning H05C
• CPC Class Codes: F41H 13/0012 Electrical discharge weapons, e.g. for stunning

Abstract

An electric discharge weapon includes a high voltage circuit, a control circuit, and a light source. The high voltage circuit includes a spark gap having a breakdown voltage affected by light. A magnitude of an electric discharge of the weapon is related to the breakdown voltage of the spark gap. Under control of the control circuit, the light source emits light to illuminate the spark gap prior to conduction so that the magnitude of the electric discharge is within a desired range.

Claims

1. A weapon for conducting a current through a target to stun or immobilize the target, the weapon comprising:

a circuit comprising;

a spark gap having a breakdown voltage for conduction, the current being produced in response to conduction by the spark gap; and

a capacitance having a voltage across the capacitance that in operation increases until conduction by the spark gap occurs, whereby conduction by the spark gap occurs in response to reaching a magnitude of the voltage across the capacitance;

a white light source that illuminates the spark gap for a duration of illumination that begins substantially prior to conduction by the spark gap to avoid increasing the voltage across the capacitance beyond a limit of operation of the circuit.

2. The weapon of claim 1 wherein the spark gap comprises an electrode and a gas, at least a portion of the gas being illuminated by the light source.

3. The weapon of claim 1 wherein the light source begins illuminating the spark gap in response to a pre-trigger event.

4. The weapon of claim 3 wherein the pre-trigger event comprises an operation of a safety switch enabling triggering of the weapon.

5. The weapon of claim 4 wherein illumination continues until a second operation of the safety switch disabling triggering of the weapon.

6. The weapon of claim 1 further comprising a control circuit wherein the light source begins illuminating the spark gap in response to a signal provided by the control circuit and the control circuit asserts the signal on lapse of a second duration greater than 12 hours.

7. The weapon of claim 1 further comprising a control circuit wherein the light source begins illuminating the spark gap in response to a signal provided by the control circuit and the control circuit asserts the signal in response to detecting a trigger event.

8. The weapon of claim 7 wherein the trigger event comprises operation of a trigger switch.

9. The weapon of claim 7 wherein the the current comprises a plurality of pulses through the target and illumination continues during the plurality of pulses.

10. The weapon of claim 1 further comprising a control circuit wherein the light source begins illuminating the spark gap in response to a signal provided by the control circuit.

11. The weapon of claim 10 wherein illumination continues until conduction by the spark gap.

12. An electrified projectile comprising the weapon of claim 1.

13. A hand held stun device comprising the weapon of claim 1.

14. A land mine comprising the weapon of claim 1.

15. A weapon of claim 1 capable of receiving a wire tethered probe for launching the probe toward the target to conduct the current through the target.

16. The weapon of claim 15 wherein the weapon is hand held.

17. A device for stationary installation comprising the weapon of claim 15.

18. A method performed by a weapon comprising a probe for launching toward a target or a terminal held against a target, a capacitance, a white light source, and a spark gap, the method comprising:

illuminating the spark gap from the white light source;

after illuminating has begun, increasing a voltage across the capacitance to a magnitude at which conduction by the spark gap occurs; and

while conduction occurs, providing a current through the probe or terminal and through the target, the current to stun or immobilize the target.

19. The method of claim 18 further comprises detecting a pre-trigger event before illuminating.

20. The method of claim 19 wherein the pre-trigger event comprises an operation of a safety switch of the weapon that enables triggering of the weapon.

21. The method of claim 20 wherein illuminating continues until a second operation of the safety switch that disables triggering of the weapon.

22. The method of claim 18 wherein:

the method further comprises;

discontinuing illuminating at a first time; and

determining a duration of non-illumination from the first time; and

illuminating begins if the duration is greater than 12 hours.

23. The method of claim 18 wherein illuminating begins after a trigger event.

24. The method of claim 23 wherein the trigger event comprises operation of a trigger switch of the weapon.

25. The method of claim 18 wherein illuminating continues until an end of a series of electric discharges provided by the weapon, the series being less than about 10 seconds.

26. The method of claim 18 wherein illuminating continues until conduction by the spark gap.

27. A computer programmed product comprising code for performing the method of claim 18.