Loudspeaker having a laminate diaphragm of three layers

Details Loudspeaker having a laminate diaphragm of three layers Loudspeaker having a laminate diaphragm of three layers

H - Electricity

04

R

349/72

H04R 7/10 (2006.01) H04R 7/02 (2006.01) H04R 7/06 (2006.01) H04R 9/06 (2006.01)

Patent

CA 1104707

ABSTRACT OF THE DISCLOSURE A loudspeaker is disclosed which has a diaphragm including first and second skins and an intermediate core in the space between the opposing inner surfaces of the skins, the core being firmly secured to the inner surface of each of the skins to form an unitary structure therewith, a first device for causing the diaphragm to vibrate in dependence on a varying electrical input signal fed to the loudspeaker, and a second device for supporting the diaphragm and first device. In this case, the skins comprise materials having a velocity of propagation of longitudinal wave more than 5000 m/sec, and the core comprise materials having a shearing elastic modulus Gco more than the value given by Image where Ef = longitudinal elasticity of the skins tr = thickness of each of the skins tc = thickness of the core ? = diameter or length of one edge of the diaphragm.

293868

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