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US 4,377,617 AGranted
Loudspeaker diaphragm and process for producing same
AssigneeOnkyo Corporation
InventorsAkira Ikei, Motoharu Akahama, Tokisuke Wada, Takashi Onogi
Life of this patent
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Abstract
A dome-shaped diaphragm for loudspeakers comprising a substrate fabric of synthetic fiber, a poly-urethane elastomer film for giving airtightness to the substrate fabric, and a viscoelastic resin adhesive adhering the fabric and the film together.
Claims10
A dome-shaped diaphragm for loudspeakers comprising:
- a substrate fabric (17) of synthetic fiber,
- a polyurethane elastomer film (13) adhered to the substrate fabric (17), and
- a viscoelastic resin adhesive (14) elastically adhering the substrate fabric (17) and the film (13) together.
A process for producing a diaphragm for loudspeakers comprising:
- the first step of forming a layer (16) of viscoelastic resin adhesive over a surface of a polyurethane elastomer film (13),
- the second step of adhering together the polyurethane elastomer film (13) and a substrate fabric (17) of synthetic fiber with the adhesive layer (16) interposed therebetween to form a diaphragm base material (20), and
- the third step of shaping the base material (20) to the form of a dome with application of heat and pressure.
Dependencies are inferred from the claim text.