Diaphragm (acoustics)
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In a loudspeaker, a diaphragm (generally, but not exclusively cone shaped) is the thin, semi-rigid membrane attached to the voice coil, which moves in a magnetic gap, vibrating the diaphragm, and producing sound. Diaphragms are also found in headphones, and microphones.
Similarly, the eardrum uses this same principle, using a diaphragm to stimulate nerves to transmit a neural "image" of sound to the brain. In loudspeakers, cellulose fiber (paper) has historically been the most common material used for the diaphragms, based on its low mass, and controllable acoustic properties. Synthetic fibres and binders may be added to provide specific properties. Other materials used for diaphragms include: polypropylene (PP), polycarbonate (PC), Mylar (PET), silk, glassfibre, carbon fibre, titanium, aluminium, aluminium-magnesium alloy, and beryllium.
[edit] References
- ALMA NP-001 Page 1, NP-001 Page 2, NP-001 Page 3, & NP-001 Page 4 Diaphragm Styles & Nomenclature
- ALMA DG-001 Dimensioning & Tolerancing Guidelines for Diaphragms
- ALMA MG-001 Measurement Guidelines for Diaphragms
- ALMA TM-100 Test Method for Measurement of the Lowest Resonance Frequency of Loudspeaker Cones
- ALMA TM-104 Test Method for Measurement of Diaphragm Neck ID
- ALMA TM-114 Test Method for Measurement of Diaphragm Body Mass
- ALMA TM-138 Test Method for Measurement of Diaphragm Assembly Mass
