Two way dynamic and electrostatic speaker enclosure with side vent for greater high frequency dispersion

• US 4,122,302 A
• Filed: 07/07/1977
• Issued: 10/24/1978
• Est. Priority Date: 10/09/1970
• Status: Expired due to Term

• Current Assignee: Chester C. Pond
• Original Assignee: Chester C. Pond
• Inventors: Bobb, Lloyd J.
• Primary Examiner(s): Stellar, George G.
• Application Number:
  US05/813,666
• Time in Patent Office: 474 Days
• Field of Search: 179/1 E, 179/1 GA, 179/111 R, 179/115.5 PS, 181/144, 181/145, 181/146, 181/147, 181/148, 181/154, 181/155, 181/156, 181/198, 181/199, 181/152
• US Class Current: 381/335
• CPC Class Codes: H04R 1/26 Spatial arrangements of separate transducers responsive to two or more frequency ranges
• CPC Class Codes: H04R 19/02 Loudspeakers H04R19/01 takes precedence

Abstract

An electroacoustic transducer, especially an electrostatic speaker embodying a conductive perforated backing plate, a dielectric membrane carrying a conductive coating, and an intervening spacing layer formed of acoustically porous or transparent dielectric material having substantially uniformly and widely distributed local areas of contact with the membrane. A speaker frame is provided in which the perforated plate is mounted and the speaker preferably comprises a pair of membranes, spaced at opposite faces of the perforated plate, the membranes being adhesively secured to the frame. The membrane coating is also interrupted to provide electrically separated areas proportioned respectively to efficiently generate sound waves of different frequencies. A special form of speaker system is also provided incorporating both an electrostatic speaker and a dynamic speaker.

Claims

1. A speaker system comprising a cabinet having enclosing wall structure including front and side walls, lower frequency range dynamic and higher frequency range electrostatic speakers mounted in the cabinet in spaced edge-to-edge relation, with the front face of each exposed for sound radiation through a separate opening in the front wall thereof, a sound radiating opening through at least one side wall of the cabinet adjacent to the electrostatic speaker, the wall structure of the cabinet further including a back wall extended from one side wall to the opposite side wall behind the dynamic speaker, the wall structure of the cabinet including the front, side and back walls of the cabinet defining a volumetrically rectangular enclosure within which the rear face of each speaker is exposed, and baffle structure within the cabinet dividing the rectangular volume within the speaker enclosure into separate portions in which the rear faces of the dynamic and electrostatic speakers are respectively exposed, the baffle structure including a baffle wall dividing said separate portions of said volume from each other, said baffle wall being positioned behind the electrostatic speaker at an oblique angle providing for reflection of sound from the back of the electrostatic speaker through the opening in the side wall of the cabinet.

2. A speaker system comprising a cabinet having enclosing wall structure including front and side walls, lower frequency range dynamic and higher frequency range electrostatic speakers mounted in the cabinet in spaced edge-to-edge relation, with the front face of each exposed for sound radiation through a separate opening in the front wall thereof, a sound radiating opening through at least one side wall of the cabinet adjacent to the electrostatic speaker, the wall structure of the cabinet further including a back wall extended from one side wall to the opposite side wall behind the dynamic speaker, the front, side and back walls of the cabinet defining a volumetrically rectangular speaker enclosure, and baffle structure within the cabinet dividing the rectangular volume within the speaker enclosure into separate chambers in which the dynamic and electrostatic speakers are respectively located and including a baffle wall positioned behind the electrostatic speaker at an oblique angle providing for reflection of sound from the back of the electrostatic speaker through the opening in the side wall of the cabinet, the wall structure defining the chamber in which the dynamic speaker is enclosed including wall elements which inhibit sound radiation from the dynamic speaker.

3. A speaker system as defined in claim 2 in which the speakers are horizontally offset from each other and in which a sound radiating opening is provided in only one of the side walls of the cabinet adjacent to the electrostatic speaker.