Linear vibrator having broadband
A linear vibrator is disclosed having a structure capable of generating a large vibratory force with a small size, outputting various types of vibrations in a wide bandwidth, and accurately coupling the magnet, the linear vibrator including: a case providing an inner space; a trembler including a yoke formed with a circular plate-shaped wing unit, a one inner lateral end-closed, cylindrical insertion unit bent from the wing unit to have a stair, an inner magnet coupled by being inserted into the insertion unit, and an external magnet coupled to one surface of the wing unit; an elastic member fixed at one end to the case and fixed at the other end to the trembler; and a stator fixed to the case to vibrate the trembler.
1. A linear vibrator, the linear vibrator comprising:
a case providing an inner space;
a vibrator including a yoke formed with a circular plate-shaped wing unit, a one inner lateral end-closed, cylindrical insertion unit bent from the wing unit to have a stair, an inner magnet coupled by being inserted into the insertion unit, and an external magnet coupled to one surface of the wing unit;
an elastic member fixed at one end to the case and fixed at the other end to the vibrator;
a stator fixed to the case to vibrate the vibrator;
a weight, which is made of a magnetic material, coupled to the other surface of the wing unit; and
a magnetic fluid coated in a ring shape on a space formed by the yoke and the elastic member to fix a position by magnetic flux leaked from the inner magnet,
wherein each of the inner and external magnets has an opposite magnetic polarity to a direction of vibrating the vibrator,
wherein the linear vibrator oscillates a vibration frequency detectable in the range of 30 Hz to an upper side ˜1.50Hz to the bottom side,
wherein a frequency band up to a maximum usable frequency detectable by vibration or sound source based on resonant frequency is 1.2 times greater than a frequency band to a minimum usable frequency, and
wherein a magnetic flux of the inner magnet is formed downwards of a trembler of the linear vibrator, and a magnetic flux of the outer magnet is formed upwards of the trembler.
2. The linear vibrator of claim 1 , further comprising a plate coupled to the external magnet and a bottom end of the inner magnet.
3. The linear vibrator of claim 2 , wherein at least one of the yoke and the plate is formed with a magnetic material.
4. The linear vibrator of claim 1 , wherein a resonant frequency of the linear vibrator is lower than a useable frequency detectable by vibration or sound source.