Diaphragm for speaker device, speaker device and mobile phone
View Patent ↗A diaphragm of a speaker device, formed into an elongated configuration, has a recessed shape and includes a voice coil arrangement part extending in its longitude direction. The voice coil arrangement part has a gap with a constant width in its lateral direction and includes a voice coil supporting part for supporting a voice coil and an expanded part provided at a position along it.
1. A diaphragm for a speaker device comprising a voice coil arrangement part in which a voice coil is arranged,
wherein the voice coil arrangement part has a substantially rectangular parallelepiped shape with an open upper side, and
wherein the voice coil arrangement part comprises:
first lateral walls facing each other with a first distance therebetween;
second lateral walls facing each other with a second distance therebetween, wherein the second distance is greater than the first distance;
a bottom surface perpendicular to the first lateral walls and the second lateral walls; and
at least one expanded part in which the first lateral walls face each other with a third distance greater than the first distance therebetween.
2. The diaphragm according to claim 1 ,
wherein the at least one expanded part comprises multiple expanded parts provided with a constant spacing therebetween.
3. The diaphragm according to claim 1 , wherein the at least one expanded part comprises first and second expanded parts respectively provided in the vicinity of each of the second lateral walls and a third expanded part substantially equi-distant from the first and second expanded parts.
4. The diaphragm according to claim 1 ,
wherein the expanded part forms a space having a prismatic or cylindrical shape.
5. The diaphragm according to claim 1 ,
wherein the voice coil arrangement part is provided at a substantially central position in a lateral direction of the diaphragm.
6. The diaphragm according to claim 1 ,
wherein the first lateral walls sandwich and fix the voice coil.
7. The diaphragm according to claim 1 ,
wherein a sound output part having a hemispherical cross-section and having a function to output an acoustic wave is provided on outer sides of the first lateral walls.
8. A speaker device comprising a diaphragm therefor including a voice coil arrangement part in which a voice coil is arranged,
wherein the voice coil arrangement part has a substantially rectangular parallelepiped shape with an open upper side, and
wherein the voice coil arrangement part comprises:
first lateral walls facing each other with a first distance therebetween;
second lateral walls facing each other with a second distance therebetween, wherein the second distance is greater than the first distance;
a bottom surface perpendicular to the first lateral walls and the second lateral walls; and
at least one expanded part in which the first lateral walls face each other with a third distance greater than the first distance therebetween.
9. The speaker device according to claim 8 , further comprising a magnetic circuit including a magnetic gap,
wherein the magnetic gap is provided at a substantially central position of the magnetic circuit, and
wherein the voice coil arrangement part of the diaphragm is arranged in the magnetic gap.
10. A mobile phone comprising a speaker device including a diaphragm therefor including a voice coil arrangement part in which a voice coil is arranged,
wherein the voice coil arrangement part has a substantially rectangular parallelepiped shape with an open upper side, and
wherein the voice coil arrangement part comprises:
first lateral walls facing each other with a first distance therebetween;
second lateral walls facing each other with a second distance therebetween, wherein the second distance is greater than the first distance;
a bottom surface perpendicular to the first lateral walls and the second lateral walls; and
at least one expanded part in which the first lateral walls face each other with a third distance greater than the first distance therebetween.