Loud speaker, diaphragm and process for making the diaphragm

A loudspeaker comprising:

• a diaphragm formed in one piece having a first portion having a first thickness and a second portion having a second thickness, said second portion extending outwardly from and around said first portion, said first portion including at least a central dome part, the first thickness being greater than the second thickness for distortion reduction, said diaphragm having a third portion having a third thickness including a voice coil junction part formed adjacent to said second portion, the third thickness being greater than the second thickness for increasing rigidity of said diaphragm, and a peripheral part extending outwardly from said voice coil junction part;
• a voice coil bobbin having a cylindrical shape connected at one end portion to said voice coil junction part,
• a voice coil disposed around a peripheral part of said voice coil bobbin;
• and
• a magnetic circuit for providing an electromagnetic driving force to said voice coil.

A loudspeaker comprising:

• a diaphragm formed in one piece having a first portion having a first thickness and a second portion having a second thickness, said second portion extending outwardly from and around said first portion, said first portion including at least a central dome part, the first thickness being greater than the second thickness for distortion reduction, said diaphragm having a third portion having a third thickness including a voice coil junction part formed adjacent to said second portion, the third thickness being greater than the second thickness for increasing rigidity of said diaphragm, and said diaphragm having a fourth portion having a fourth thickness including a peripheral part extending outwardly from said voice coil junction part, the third thickness being greater than the fourth thickness;
• a voice coil bobbin having a cylindrical shape connected at one end portion to said voice coil junction part,
• a voice coil disposed around a peripheral part of said voice coil bobbin;
• and
• a magnetic circuit for providing an electromagnetic driving force to said voice coil.

A loudspeaker comprising:

• a diaphragm formed in one piece having a first portion having a first thickness and a second portion having a second thickness, said second portion extending outwardly from and around said first portion, said first portion including at least a central dome part, said diaphragm having a third portion having a third thickness including a voice coil junction part formed adjacent to said second portion, the third thickness being greater than the second thickness for increasing rigidity of said diaphragm, and said diaphragm having a fourth portion having a fourth thickness including a peripheral part extending outwardly from said voice coil junction part;
• a voice coil bobbin having a cylindrical shape connected at one end portion to said voice coil junction part,
• a voice coil disposed around a peripheral part of said voice coil bobbin;
• and
• a magnetic circuit for providing an electromagnetic driving force to said voice coil.