Sound-transmitting membrane and electronic device equipped with sound-transmitting membrane
AssigneeNitto Denko Corporation
InventorMasaaki Mori
Life of this patent
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Abstract
A sound-transmitting membrane (1) is provided that allows passage of sounds and prevents passage of foreign matters, the sound-transmitting membrane (1) including a supporting member (12) and a resin porous membrane (11) layered on the supporting member (12) and containing polytetrafluoroethylene as a main component. The supporting member (12) is a nonwoven fabric containing an elastomer. Since the supporting member (12) is a nonwoven fabric containing an elastomer, the insertion loss of the sound-transmitting membrane can be reduced for sounds of 3000 Hz.
Claims4
A sound-transmitting membrane that allows passage of sounds and prevents passage of foreign matters, the sound-transmitting membrane comprising:
- a supporting member;
- and
- a resin porous membrane layered on the supporting member and containing polytetrafluoroethylene as a main component,
- wherein the supporting member is a nonwoven fabric comprising an elastomer,
- an insertion loss for sounds of 3000 Hz of the sound-transmitting membrane is smaller than or equal to 5 dB, and
- a ratio of the insertion loss for the sounds of 3000 Hz to an insertion loss for sounds of 1000 Hz of the sound-transmitting membrane is in a range from 1.0 to 2.0.
Dependencies are inferred from the claim text.