VERFAHREN ZUR HERSTELLUNG EINER MEMBRAN FÜR EINEN ELEKTROAKUSTISCHEN WANDLER

摘要

The membrane manufacture procedure provides areas of reduced thickness in a deformable thermoplastics material of constant thickness by clamping the inner areas (8) which are to remain at the initial thickness and the periphery of the membrane via respective fixing devices (6,6'; 7,7'). The intermediate parts (9) of the membrane are reduced in thickness by applied tensile force and heat. The obtained membrane is then positioned in a stamping mould for providing a shaped membrane with a raised central area, enclosed by an annular raised area and a flat peripheral lip.