Loud speaker system

{
  "publication_number": "US3772466A",
  "country": "US",
  "kind": "A",
  "title": "Loud speaker system",
  "abstract": "This invention relates to a loudspeaker system comprising a directly energized high frequency diaphragm and at least one low frequency diaphragm accoustically coupled to the high frequency diaphragm through a substantially enclosed air space having a predetermined volume and surface area whereby the frequency of vibrations transmitted there through may be controlled.",
  "claims": [
    "1. A loudspeaker system comprising an energising system, a high frequency diaphragm having at least one predetermined surface, means for coupling said energising system to said high frequency diaphragm, a low frequency diaphragm having at least one predetermined surface, Air-tight resilient means for physically connecting said predetermined surface of said high frequency diaphragm at the outer edge thereof with a portion of said predetermined surface of said low frequency diaphragm whereby a volume of air is totally enclosed between said high frequency diaphragm, said portion of said low frequency diaphragm and said physical connecting means, said predetermined surface of said high frequency diaphragm as defined thereon by said connecting means is greater in area then said portion of said surface of said low frequency diaphragm defined by said connecting means whereby a small movement of the high frequency diaphragm is transformed into a large movement of the low frequency diaphragm by the enclosed volume of air.",
    "2. A loudspeaker system according to claim 1 Wherein the energising system comprises a magnet system located in a position adjacent to a surface of said high frequency diaphragm other than the said predetermined surface whereof a portion is connected with said means for physically connecting said high frequency diaphragm to said low frequency diaphragm.",
    "3. A loudspeaker system according to claim 1 wherein said low frequency diaphragm has a conical cross section and said means for physically connecting a portion of the predetermined surface of said high frequency diaphragm to said low frequency diaphragm is located upon said low frequency diaphragm so as to define upon the predetermined surface thereof an area encompassing the central portion of said low frequency diaphragm wherein the axis of rotation of the cone defining the conical section of said low frequency diaphragm is also the axis of rotation of the area of surface thus defined.",
    "4. A loudspeaker system in accordance with claim 1 wherein the said high frequency diaphragm and said low frequency diaphragm are of frusto conical cross section and said means for physically connecting a portion of the predetermined surface of said high frequency diaphragm with a portion of the predetermined surface of said low frequency diaphragm is so located that the portions of said predetermined surfaces thus defined are located so that the axis of rotation of said portions is other than the axis of rotation of the frusto conical section.",
    "5. A loudspeaker system according to claim 4 wherein the axis of rotation of said low frequency diaphragm is substantially common with the axis of rotation of said high frequency diaphragm and said high frequency diaphragm and said low frequency diaphragm lie in the same hemisphere of arc having a common axis of rotation with said conical section.",
    "6. A loudspeaker system according to claim 5 wherein the angle of arc subtended by the high frequency diaphragm to said common axis of rotation is the same as that subtended by said low frequency to said axis of roTation.",
    "7. A loudspeaker system according to claim 1 wherein said means physically connecting said high frequency to said low frequency diaphragm are rippled members."
  ],
  "cpc": [
    "H04R 1/2834",
    "H04R 7/122"
  ],
  "assignees": [
    "ROMEN KG KDT"
  ],
  "filing_date": "1971-11-24",
  "publication_date": "1973-11-13",
  "grant_date": "1973-11-13",
  "priority_date": "1970-11-25",
  "application_number": "US-20174971-A",
  "family_id": "5789040",
  "citations": [
    "US1988250A",
    "US2231479A",
    "US2704185A",
    "US3019849A",
    "US3275758A"
  ]
}