Patent ID: 8144918

Claim:
A diaphragm for a planar speaker comprising: a voice coil layer including a plurality of voice coils, each including a wound-wire conductor; lead lines to draw both ends of each of the voice coils to the outside; a first adhesive layer formed on a first side of the plurality of voice coils; a second adhesive layer formed on a second side of the plurality of voice coils, the plurality of voice coils being entirely sandwiched between the first and second adhesive layers; a first base bonded to a side of the first adhesive layer that is opposite the plurality of voice coils; and a second base bonded to a side of the second adhesive layer that is opposite the plurality of voice coils, the first and second adhesive layers with the voice coils therebetween being sandwiched between the first and second bases, wherein both surfaces of the first and second bases are flat, both surfaces of the first and second adhesive layers are flat, and the first and second adhesive layers include a thermosetting resin, the diaphragm being thermally cured.