| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low-profile speaker unit which includes: a diaphragm of which a central part recesses from an outer peripheral part, with a hole formed at the central part; a frame whose outer peripheral part is fitted to the outer peripheral part of the diaphragm; a magnetic circuit which is provided to the bottom part of the frame, including magnetism generating means and a yoke and having a magnetic gap for generating a magnetic field that is orthogonal to the vibration direction of the diaphragm; a voice coil consisting of a tubular bobbin and a coil wound around the outer peripheral surface of the bobbin; and a damper which is arranged between the diaphragm and the magnetic circuit, and in which an outer peripheral part is fitted to the frame, the bobbin of the voice coil is fitted to the central part so that the coil is positioned at a magnetic gap of the magnetic circuit, and a flexible part which is flexible along the vibration direction of the diaphragm is formed between the central part and the outer peripheral part. <P>SOLUTION: A waveform formation part (flexible part) 51e of a damper 51 and fitting parts (outer peripheral parts) 51a and 51b are configured to be positioned closer to the bottom part of a frame than to a central part 51d of the damper 51. <P>COPYRIGHT: (C)2012,JPO&INPIT |
