Tiinlab Corporation

Xiaolin Deng

Shihchia Chiu

Xiaochao Gong

A speaker includes a vibration diaphragm, a voice coil, a first magnet, and a second magnet. Each of the first and second magnets includes an end adjacent to the voice coil and an end distant from the voice coil, of which magnetic polarities are opposite to each other. The ends of the first magnet and the second magnet that are adjacent to the voice coil are of opposite magnetic polarities. The voice coil is partly aligned with a gap between the first magnet and the second magnet. A portion of the voice coil is located between the end surfaces of the first and second magnets that exhibit a height difference. Due to the height difference, a path of the magnetic lines of force is shortened and the magnetic flux density in an area around the voice coil is thus increased, thereby increasing the BL value of electromechanical coupling factor.

Speaker

A miniature loudspeaker includes an outer shell, a magnetic circuit assembly including an inner-ring magnetic circuit unit and an outer-ring magnetic circuit unit with an annular gap formed therebetween, a voice coil and a diaphragm. The outer shell is provided with a positioning column which defines a hollow channel, and a hollow tuning hole is defined in the bottom of the outer shell corresponding to the hollow channel. Multiple circumferential tuning holes are defined at the bottom of the outer shell and communicated with the annular gap to form a tuning channel. The voice coil includes a winding located in the annular gap and between the middle magnets of the inner-ring magnetic circuit unit and the outer-ring magnetic circuit unit. The hollow channel directly faces the diaphragm and forms another tuning channel together with the diaphragm.

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Shenzhen, China

Xiaolin Deng