IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0137063
(2002-04-30)
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발명자
/ 주소 |
- Reynolds, Richard K.
- Cunningham, Andrew F.
- Hennings, George N.
- Nickolin, Thomas M.
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출원인 / 주소 |
- KDI Precision Products, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
19 인용 특허 :
11 |
초록
▼
A detonator for initiating a detonation event in an explosive charge. The detonator comprises an exploding foil initiator and a switch. The exploding foil initiator includes a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another. The switch includes
A detonator for initiating a detonation event in an explosive charge. The detonator comprises an exploding foil initiator and a switch. The exploding foil initiator includes a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another. The switch includes a switch contact that is spaced apart from the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact. A discharge arc, which is formed when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap, closes the switch to thereby permit current to flow between the bridge contact and the switch contact.
대표청구항
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1. A detonator for initiating a detonation of an explosive charge, the detonator comprising an exploding foil initiator and a switch, the exploding foil initiator having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another, the switch having a swi
1. A detonator for initiating a detonation of an explosive charge, the detonator comprising an exploding foil initiator and a switch, the exploding foil initiator having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another, the switch having a switch contact, said switch being defined by the switch contact and the bridge contact, the switch contact being spaced apart from the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact;wherein a discharge arc closes the switch to thereby permit current to flow between the bridge contact and the switch contact, the discharge arc being formed across the spark gap and between the bridge contact and the switch contact when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap. 2. The detonator of claim 1, further comprising a secondary switch that is operable in a first condition which does not affect the operation of the switch such that the switch is closed only by the formation of the discharge arc in response to the application of a voltage across the bridge contact and the switch contact in excess of the gap breakdown voltage, the secondary switch also being operable in a second condition which affects the operation of the switch such that the switch is closed at a voltage that is less than the gap breakdown voltage.3. The detonator of claim 2, wherein the secondary switch has a switch element that is disposed within the spark gap, the switch element changing states when the secondary switch is positioned in the second condition to shorten the width of the spark gap.4. A detonator for initiating a detonation of an explosive charge, the detonator comprising:an exploding foil initiator having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another; a switch having a switch contact, the switch contact being spaced apart from the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact; and a secondary switch having a switch element that is disposed within the spark gap, the switch element changing states when the secondary switch is positioned in the second condition to shorten the width of the spark gap, the secondary switch being operable in a first condition which does not affect the operation of the switch such that the switch is closed only by the formation of the discharge arc in response to the application of a voltage across the bridge contact and the switch contact in excess of the gap breakdown voltage, the secondary switch also being operable in a second condition which affects the operation of the switch such that the switch is closed at a voltage that is less than the gap breakdown voltage, said switch element being in a solid state when the secondary switch is positioned in the first condition and the switch element changing to a plasma state when the secondary switch is positioned in the second condition; wherein a discharge arc closed the switch to thereby permit current to flow between the bridge contact and the switch contact, the discharge arc being formed when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap. 5. The detonator of claim 4, wherein the secondary switch includes a first terminal and a second terminal, the first terminal being electrically coupled to the bridge contact and a first end of the switch element, the second terminal being electrically coupled to a second end of the switch element and an auxiliary switch, the auxiliary switch including an auxiliary switch element that is movable between a grounded condition, which electrically couples the second terminal to an electrical ground, and a open condition which inhibits current from flowing between the second terminal and the electrical ground.6. The detonator of claim 5, wherein the secondary switch further comprises an electric load device that is coupled in series between the first terminal and the bridge contact.7. The detonator of claim 6, wherein the electric load device has an impedance of at least 50 ohms.8. The detonator of claim 6, further comprising a capacitor for providing a source of electrical energy to the bridge contact, the capacitor having a predetermined capacitance, the load device capacitively coupling the auxiliary switch to the capacitor with a capacitance of about 1% of the predetermined capacitance to about 10% of the predetermined capacitance.9. The detonator of claim 2, wherein application of a voltage across the bridge contact and the switch contact generates an electric field, the electric field being affected when the secondary switch is changed from the first condition to the second condition to distort the electric field and thereby initiate a formation of the discharge arc.10. The detonator of claim 9, wherein placement of the secondary switch into the second condition releases a pulse of energy that is employed to produce at least one of an auxiliary electric field and a magnetic field to distort the electric field.11. The detonator of claim 10, wherein the secondary switch includes an electrically charged conductive pad that is disposed proximate one of the bridge contact and the switch contact.12. The detonator of claim 10, wherein the secondary switch includes a conductive pad that is electrically coupled to one of the bridge contact and the switch contact.13. The detonator of claim 1, wherein the detonator bridge and the switch contact are coupled to a base that is formed from an electrically insulating material and wherein the base is coupled to a first side of the detonator bridge and a flyer layer is coupled to a second layer of the detonator bridge, the flyer layer being formed of an electrically insulating material and covering the bridge member.14. The detonator of claim 13, wherein at least a portion of the flyer is juxtaposed between the detonator bridge and a barrel layer, the barrel layer being coupled to the base and formed from an electrically insulating material.15. A detonator for initiating a detonation of an explosive charge, the detonator comprising:an exploding foil initiator having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another; a flyer layer being formed of an electrically insulating material, said flyer layer covering the bridge member; a switch having a switch contact, the switch contact being spaced apart from the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact; barrel layer being formed from an electrically insulating material, wherein at least a portion of the flyer layer is juxtaposed between the detonator bridge and the barrel layer, wherein a spark aperture is formed in the barrel layer; a base being formed from an electrically insulating material, said base being coupled to said detonator bridge, said switch contact and said barrel layer, said base being further coupled to a first side of the detonator bridge, said flyer layer being coupled to a second side of the detonator bridge, wherein a discharge arc closes the switch to thereby permit current to flow between the bridge contact arc and the switch contact, the discharge arc being formed between the bridge contact and the switch contact in the spark aperture when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap; said spark aperture being sized such that the barrel layer does not overlie the bridge contact, the spark gap and the switch contact in the area proximate the discharge arc. 16. The detonator of claim 13, wherein the detonator bridge and the switch contact are simultaneously formed onto the base.17. The detonator of claim 1, further comprising a housing into which the exploding foil initiator and the switch are hermetically sealed.18. A detonator for initiating a detonation of an explosive charge, the detonator comprising:an exploding foil initiator having a base, a detonator bridge, a flyer layer and a barrel layer, the base being formed from an electrically insulating member, the detonator bridge having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another, the flyer layer overlying the bridge member, the barrel layer overlying the flyer layer and being coupled to the base; and a switch having a switch contact, said switch being defined by the switch contact and the bridge contact, the switch being formed onto the base in a spaced apart relation with the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact; wherein a discharge arc closes the switch to thereby permit current to flow between the bridge contact and the switch contact, the discharge arc being formed across the spark gap and between the bridge contact and the switch contact when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap. 19. A detonator for initiating a detonation of an explosive charge, the detonator comprising:an exploding foil initiator having a base, a detonator bridge, a flyer layer and a barrel layer, the base being formed from an electrically insulating member, the detonator bridge having a detonator bridge with a bridge member and a bridge contact that are electrically coupled to one another, the flyer layer overlying the bridge member, the barrel layer overlying the flyer layer and being coupled to the base; and a switch having a switch contact that is formed onto the base in a spaced apart relation with the detonator bridge such that a spark gap of a predetermined width is defined between the bridge contact and the switch contact; wherein a discharge arc closes the switch to thereby permit current to flow between the bridge contact and the switch contact, the discharge arc being formed when a voltage in excess of a predetermined gap breakdown voltage is applied across the spark gap, wherein a spark aperture is formed in the barrel layer, the spark aperture being sized such that the barrel layer does not overlie the bridge contact, the spark gap and the switch gap contact in an area proximate the discharge arc. 20. The detonator of claim 18, further comprising a housing into which the exploding foil initiator and the switch are hermetically sealed.21. The detonator of claim 18, further comprising a secondary switch that is operable in a first condition which does not affect the operation of the switch such that the switch is closed only by the formation of the discharge arc in response to the application of a voltage across the bridge contact and the switch contact in excess of the gap breakdown voltage, the secondary switch also being operable in a second condition which affects the operation of the switch such that the switch is closed at a voltage that is less than the gap breakdown voltage.22. The detonator of claim 21, wherein the secondary switch has a switch element that is disposed within the spark gap, the switch element changing states when the secondary switch is positioned in the second condition to shorten the width of the spark gap.23. The detonator of claim 21, wherein application of a voltage across the bridge contact and the switch contact generates an electric field, the electric field being affected when the secondary switch is changed from the first condition to the second condition to distort the electric field and thereby initiate a formation of the discharge arc.24. The detonator of claim 15, further comprising a protective layer overlying the barrel layer to thereby confine the spark gap from a side opposite the base.25. The detonator of claim 24, wherein the protective layer is formed from an electrically insulating material.26. The detonator of claim 19, further comprising a protective layer overlying the barrel layer to thereby confine the spark gap from a side opposite the base.27. The detonator of claim 26, wherein the protective layer is formed from an electrically insulating material.
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