Speaker cabinet

• US 4,109,983 A
• Filed: 03/07/1977
• Issued: 08/29/1978
• Est. Priority Date: 08/22/1974
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Kinoshita, Shouzo
• Primary Examiner(s): Gilliam, Paul R.
• Assistant Examiner(s): Sakran, Victor N.
• Application Number:
  US05/775,016
• Time in Patent Office: 540 Days
• Field of Search: 312/214, 312/7 TV, 312/357, 181/199, 181/198, 428/310-314, 428/322, 220/9 F, 178/7.9
• US Class Current: 312/7.1
• CPC Class Codes: B32B 21/047 of foam
• CPC Class Codes: B32B 2266/045 Metal
• CPC Class Codes: B32B 2266/06 Open cell foam
• CPC Class Codes: B32B 2307/102 Insulating
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 3/28 characterised by a layer comprising a deformed thin sheet , i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled B32B29/08 takes precedence
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: Y10T 428/24996 With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers
• CPC Class Codes: Y10T 428/249968 Of hydraulic-setting material

Abstract

A speaker cabinet is constituted with plate material formed by intimately bonding a rigid foam plate having communicating or open-cell bubbles to a surface plate material with the latter being outside.

Claims

1. An acoustically improved speaker cabinet for housing a speaker and having a plurality of walls each having an inner surface and an outer surface, and wherein each wall comprises a rigid, sound-absorbing open-cell foamed place containing communicating bubbles and forming said inner surface, and a surface plate intimately bonded to said foamed plate and forming the outer surface of the wall, said surface plate being relatively impermeable to air, whereby the effective acoustical interior volume of said cabinet is substantially larger than the actual physical volume thereof, and whereby resonant vibration of the cabinet is eliminated.

2. A speaker cabinet according to claim 1, wherein said foamed plate is of foamed concrete.

3. A speaker cabinet according to claim 2, wherein said foamed concrete has specific weight in a range 0.3 to 0.6.

4. A speaker cabinet according to claim 1, wherein said foamed plate is of foamed aluminum.