Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1993-05-07
1994-10-04
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
181196, 381154, 128 33, 128 38, 601 57, H04R 2300
Patent
active
053532619
ABSTRACT:
A hollow member having a continuous sound-waveguide therein is formed by a plate shaped rigid base member microwave welded to an overriding member of flexible and semi-rigid plastic made, e.g., by vacuum forming. A speaker and an amplifier are confined in the hollow member which is filled with gas. The shape, material and thickness of the hollow member is selected to have a strength capable of retaining the shape of a sound-waveguide without an airpressure within the hollow member against reasonable external forces imposed, such as when under the usual condition of use on the back or seat of a chair.
REFERENCES:
patent: 5135282 (1992-08-01), Pappers
Andoh Kimihiro
Ishigaki Ryuzou
Kakiuchi Yoshihiko
Tamura Shingo
ECS-88 Company, Limited
Eldred J. Woodrow
Matsushita Electric - Industrial Co., Ltd.
Vank Corporation
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