Protection system for devices connected to an alternating current electrical power supply
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02H-005/04
출원번호
US-0476562
(2000-01-03)
발명자
/ 주소
Legatti, Raymond H.
출원인 / 주소
Technology Research Corporation
대리인 / 주소
Gealow, Jon Carol
인용정보
피인용 횟수 :
20인용 특허 :
24
초록▼
A protective arrangement for an electrical device energized from an alternating current power supply which de-energizes the electrical device when undesirable conditions, develop within the electrical device. The protective arrangement, when provided for an electrical device having protection for un
A protective arrangement for an electrical device energized from an alternating current power supply which de-energizes the electrical device when undesirable conditions, develop within the electrical device. The protective arrangement, when provided for an electrical device having protection for undesirable leakage currents in the power cord supplying to electrical device, utilizes the same circuit interrupting device to de-energize the electrical device upon the occurrence of an undesirable condition, other than a leakage current, within the device, or upon the occurrence of an undesirable leakage current in the power cord supplying the electrical device.
대표청구항▼
A protective arrangement for an electrical device energized from an alternating current power supply which de-energizes the electrical device when undesirable conditions, develop within the electrical device. The protective arrangement, when provided for an electrical device having protection for un
A protective arrangement for an electrical device energized from an alternating current power supply which de-energizes the electrical device when undesirable conditions, develop within the electrical device. The protective arrangement, when provided for an electrical device having protection for undesirable leakage currents in the power cord supplying to electrical device, utilizes the same circuit interrupting device to de-energize the electrical device upon the occurrence of an undesirable condition, other than a leakage current, within the device, or upon the occurrence of an undesirable leakage current in the power cord supplying the electrical device. ment is aspherical. 3. The zoom lens according to claim 2, wherein the first lens element is a plastic element. 4. The zoom lens according to claim 1, wherein the first lens element is a meniscus lens having a concave surface on the object side. 5. The zoom lens according to claim 1, wherein the first lens element is a meniscus lens having a convex surface on the object side. 6. The zoom lens according to claim 1, wherein the second lens element is a spherical glass element. 7. The zoom lens according to claim 1, wherein the third lens element is a spherical glass element. 8. The zoom lens according to claim 1, wherein the first lens group includes a variable iris having a mechanical aperture stop positioned between the first lens element and the second lens element. 9. The zoom lens according to claim 1, wherein the first lens element is in a fixed position relative to the second lens element and moveably positioned relative to the third lens element. 10. A zoom lens comprising, in order from an object side: a first lens group having a first lens element and a second lens element; and a second lens group having a third lens element, wherein the zoom lens satisfies the following condition: |φ1|/φw1is a power of the first lens element and φwis a power of the zoom lens in a wide angle position. 11. The zoom lens according to claim 10, the first lens element having a first surface and a second surface, wherein at least one surface of the first lens element is aspherical. 12. The zoom lens according to claim 11, wherein both the first surface and the second surface are aspherical. 13. The zoom lens according to claim 11, wherein the first lens element is plastic. 14. A zoom lens comprising, in order from an object side: a first lens group having a first lens element and a second lens element, the first lens group having a power, the second lens element having a power; and a second lens group having a third lens element, wherein the power of the first lens group is substantially equal to the power of the second lens element. 15. The zoom lens according to claim 14, wherein the first lens element has at least one aspherical surface. 16. The zoom lens according to claim 14, wherein the zoom lens satisfies the following condition: |φ1|/φw1is a power of the first lens element and φwis a power of the zoom lens in a wide angle position. 17. The zoom lens according to claim 14, wherein the zoom lens satisfies the following conditions: |φ1|/φw1is a power of the first lens element and φwis a power of the zoom lens in a wide angle position. 18. A zoom lens comprising, in order from an object side: a first lens group including a plastic first lens element having at least one aspherical surface and a glass second lens element having spherical surfaces; and a second lens group including a glass third lens element having spherical surfaces, wherein the zoom lens satisfies the following condition: |φ1|/φw1is a power of the first lens element and φwis a power of the zoom lens in a wide angle position. 19. The zoom lens according to claim 18, wherein the first lens element is a meniscus lens having a concave surface on the object side. 20. The zoom lens according to claim 18, wherein the first lens element is a meniscus lens having a convex surface on the object side. ple-pass optical cell with refocusing mirrors that has the advantage of avoiding beam-spreading problems. This approach differs from previous free-space approaches in that it uses only one optical switch or spatial light modulator instead of one or more switches for each bit. In one approach, a microwave signal for each antenna element may be modulated onto an optical beam. After the individual optical beams are delayed by the desired amount of time through the system, the signals may then be down-converted to microwave signals for further processing. This process may be used in either the transmit or the receive mode of a phased array radar.
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