Speaker device and mobile phone

A speaker device comprising:

• a magnetic circuit which includes a magnetic gap;
• a diaphragm which has a recessed part of a substantially rectangular parallelepiped shape opening toward a sound output side of the diaphragm, at least a part of the recessed part being arranged in the magnetic gap, and the recessed part extending in a direction substantially orthogonal with respect to a direction of a magnetic flux in the magnetic gap;
• and
• a voice coil which is formed into an annular shape comprising:
• a first parallel part, at least a part of the first parallel part being arranged in the recessed part;
• and a second parallel part extending in a direction in parallel with the first parallel part, at least a part of the second parallel part being arranged outside of the recessed part
• wherein the at least a part of the first parallel part is arranged in the magnetic gap, and
• wherein the second parallel part is arranged outside of the magnetic gap.

A speaker device comprising:

• a magnetic circuit which includes a magnetic gap;
• a diaphragm which has a recessed part arranged in the magnetic gap and extending in a direction substantially orthogonal with respect to an extending direction of a magnetic flux in the magnetic gap;
• and
• a voice coil which has a Y-shaped cross-section and has a first part having a first parallel part extending in one direction, a second part having a second parallel part extending in a direction in parallel with the first parallel part and connected with the first part to form an annular shape, and a third part having a third parallel part extending in the direction in parallel with the first parallel part and connected with the first part to form an annular shape, the third parallel part being arranged at a position symmetrical with the second parallel part with respect to a central line passing through a center in a width direction of the first parallel part, the width direction corresponding to an extending direction of the magnetic flux,
• wherein the first parallel part, the second parallel part and the third parallel part are arranged in a direction in parallel with an extending direction of the recessed part, respectively, and
• wherein an entire or one part of the first parallel part is arranged in the recessed part to be positioned in the magnetic gap, and the second parallel part and the third parallel part are positioned on an upper surface on a sound output side of the diaphragm, respectively.

A mobile phone comprising a speaker device including:

• a magnetic circuit which includes a magnetic gap;
• a diaphragm which has a recessed part of a substantially rectangular parallelepiped shape opening toward a sound output side of the diaphragm, at least a part recessed part being arranged in the magnetic gap, and the recessed part extending in a direction substantially orthogonal with respect to an extending direction of a magnetic flux in the magnetic gap;
• and
• a voice coil of an annular shape, which includes:
• a first parallel part, at least a part of the first parallel part being arranged in the recessed part;
• and at least a second parallel part arranged outside of the recessed part and extending in a direction in parallel with the first parallel part,
• wherein the at least a part of the first parallel part is arranged in the magnetic gap, and
• wherein the at least a second parallel part is arranged outside of the magnetic gap.