IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0000109
(2001-10-30)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
51 |
초록
▼
The present invention provides a radio frequency ("RF") shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging ("MRI") equipment through the supports of such equipment.
The present invention provides a radio frequency ("RF") shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging ("MRI") equipment through the supports of such equipment. The RF enclosure uses multiple layers and types of insulating materials positioned to maximize the noise absorption of the RF enclosure. This reduces the cost and space required by the enclosure. In one embodiment the enclosure includes a ceiling, a floor and a plurality of walls. The ceiling and walls include one or more multiple layers of different indulating materials that either abut each other or form air gaps. In one embodiment the floor includes a heavy metal plate on which the MRI equipment sits. The plate elastically couples to a conductive shield. The elastic coupling attenuates certain frequencies above the natural frequency of the metal sheet.
대표청구항
▼
The present invention provides a radio frequency ("RF") shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging ("MRI") equipment through the supports of such equipment.
The present invention provides a radio frequency ("RF") shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging ("MRI") equipment through the supports of such equipment. The RF enclosure uses multiple layers and types of insulating materials positioned to maximize the noise absorption of the RF enclosure. This reduces the cost and space required by the enclosure. In one embodiment the enclosure includes a ceiling, a floor and a plurality of walls. The ceiling and walls include one or more multiple layers of different indulating materials that either abut each other or form air gaps. In one embodiment the floor includes a heavy metal plate on which the MRI equipment sits. The plate elastically couples to a conductive shield. The elastic coupling attenuates certain frequencies above the natural frequency of the metal sheet. d air is trapped and an inside of said speaker box. 5. The speaker system for use with a shallow depth large volume displacement passive radiator as in claim 2, wherein said pressure vent system provides air port holes through said outer surround and between said space in which said air is trapped and a space outside of said speaker box. 6. The speaker system for use with a shallow depth large volume displacement passive radiator as in claim 1, further comprising: an amplifier frame including amplifier circuitry fixed to said speaker box. 7. The speaker system for use with a shallow depth large volume displacement passive radiator as in claim 2, further comprising: an amplifier frame including amplifier circuitry fixed to said speaker box. 8. The speaker system for use with a shallow depth large volume displacement passive radiator as in claim 3, further comprising: an amplifier frame including amplifier circuitry fixed to said speaker box. 9. The speaker system for with a shallow depth large volume displacement passive radiator as in claim 4, further comprising: an amplifier frame including amplifier circuitry fixed to said speaker box. 10. The speaker system for use with a shallow depth large volume displacement passive radiator as in claim 5, further comprising: an amplifier frame including amplifier circuitry fixed to said speaker box. 11. A passive radiator comprising: a radiator support member defined by an opening through a speaker enclosure, said radiator support member having a first and a second surface with an interior edge between said first and second surfaces; an inner center member having a first and a second side; a first surround encircling and having an inner edge fixed to the perimeter of said first side of said inner center member, and having an outer edge fixed to a perimeter of said first surface of said radiator support member, said first surround defining an arch extending in a first direction; an outer center member having a first and a second side; and a second surround encircling and having an inner edge fixed to the perimeter said first side of said of outer center member, and having an outer edge fixed to a perimeter of said second surface of said radiator support member, said second surround defining an arch extending in a second direction, opposite said first direction; wherein said second surface of said inner center member is fixed to and substantially integral with said second surface of said outer center member; wherein an air chamber is defined between said first and second surrounds, said inner center and outer center members fixed one to the other, and said interior edge of said radiator support member; wherein said air chamber is vented to one of an interior or an exterior of said speaker enclosure through at least one hole in at least one of said first surround, said second surround, said radiator support member, and said inner and outer center members. 12. The passive radiator as in claim 11, wherein the inner center member is fixed to and substantially integral with said outer center member through a connection member fixed to and between said inner center member and said outer center member. 13. The passive radiator as in claim 12, wherein the inner center member and said outer center member each are a substantially flat plate. 14. The passive radiator as in claim 12, wherein said inner center member has an inner member surface reference plane and said outer center member has an outer member surface reference plane; wherein said connection member is fixed to the inner and the outer center member so as to keep said inner member surface reference plane substantially parallel to said outer member surface reference plane. 15. The passive radiator as in claim 13, wherein said inner center member has an inner member surface reference plane and said outer center member has an outer member surface reference plane; wherein said co nnection member is fixed to the inner and the outer center member so as to keep said inner member surface reference plane substantially parallel to said outer member surface reference plane. 16. The passive radiator as in claim 12, wherein said connection member has a mass that provides acoustic resonance of said passive radiator at a selected frequency. 17. The passive radiator as in claim 13, wherein said connection member has a mass that provides acoustic resonance of said passive radiator at a selected frequency. 18. The passive radiator as in claim 14, wherein said connection member has a mass that provides acoustic resonance of said passive radiator at a selected frequency. 19. A passive radiator comprising: a radiator support member defined by an opening through a speaker enclosure; a frame surrounding and defining a central opening therethrough sized to mount within said radiator support member; an inner center member having a perimeter therearound; an inner elastic member encircling and having a first edge fixed to said perimeter of said inner center member and a second edge fixed to a first location of said central opening in said frame; and an outer center member having a perimeter therearound; an outer elastic member encircling and having a first edge fixed to said perimeter of said outer center member and a second edge fixed to a second location of said central opening in said frame; where the inner center member is fixed to and moves with said outer center member as a center member assembly; wherein said center member assembly is suspended in a neutral position by said inner elastic member and said outer elastic member when no force other than that of said inner elastic member and said outer elastic member is applied to said center member assembly; wherein when said center member assembly is displaced in a first direction, which is approximately along a center axis of said opening in said frame, the elastic restoring force versus displacement curve evident when moving said center member assembly in said first direction from said neutral position is approximately symmetrical with the elastic restoring force versus displacement curve evident when moving said center member assembly in a second direction from said neutral position, where said second direction is opposite said first direction; wherein an air chamber is defined between said inner elastic member, said outer elastic member, said inner and outer center fixed one to the other as said center member assembly, and said frame; wherein said air space chamber is vented to one of an interior or an exterior of said speaker enclosure through at least one hole in at least one of said inner and outer elastic members, said center member assembly and said frame. 20. The passive radiator as in claim 19, wherein when said center member assembly is displaced in a first direction, which is approximately along a center axis of said opening in said frame, the elastic restoring force versus displacement curve evident when moving said center member assembly in said first direction from said neutral position is approximately linear with the elastic restoring force versus displacement curve evident when moving said center member assembly in a second direction from said neutral position, where said second direction is opposite said first direction. 21. The passive radiator as in claim 19, wherein the ratio of the size of the smaller of the first location of said opening and second location of said opening to the larger of the first location of said opening and second location of said opening is 0.8 or greater. 22. The passive radiator as in claim 19, wherein the size of said inner elastic member is approximately the same as the size of said outer elastic member. 23. The passive radiator as in claim 19, wherein a closest distance between said inner elastic member and said outer elastic member is approximately 1 inch (2.54 cm). 24
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