Haptic output device
A haptic output device includes an actuator that provides a haptic effect and a signal transmitter that transmits a driving signal and a braking signal to the actuator. The driving signal includes a first driving waveform in a first half cycle, a second driving waveform, following the first driving waveform, in a second half cycle, and a third driving waveform, following the second driving waveform, in a third half cycle. The braking signal includes a braking waveform following the third driving waveform. The polarities of the voltage values of the first driving waveform and second driving waveform are opposite to each other. The polarities of the voltage values of the second driving waveform and third driving waveform are opposite to each other. The braking waveform has a phase opposite to the phase of the driving signal. The third driving waveform has a higher frequency than the first driving waveform.
1. A haptic output device comprising:
an actuator that provides a haptic effect; and
a signal transmitter that transmits a driving signal and a braking signal to the actuator; wherein
the driving signal includes a first driving waveform in a first half cycle, a second driving waveform, which follows the first driving waveform, in a second half cycle, and a third driving waveform, which follows the second driving waveform, in a third half cycle;
the braking signal includes a braking waveform, which follows the third driving waveform;
a voltage value of the second driving waveform has a polarity opposite to a polarity of a voltage value of the first driving waveform;
a voltage value of the third driving waveform has a polarity opposite to the polarity of the voltage value of the second driving waveform;
the braking waveform has a phase opposite to a phase of the driving signal;
a frequency of the third driving waveform is higher than a frequency of the first driving waveform; and
a total number of waveforms included in all of the first driving waveform, the second driving waveform, and the third driving waveform is not equal to a total number of waveforms included in the braking waveform.
2. The haptic output device according to claim 1 , wherein an amplitude of the braking waveform in a first half cycle of the braking waveform is equal to or larger than an amplitude of the first driving waveform.
3. The haptic output device according to claim 1 , wherein an amplitude of the braking waveform in a last half cycle of the braking waveform is equal to or smaller than an amplitude of the first driving waveform.
4. The haptic output device according to claim 1 , wherein a half cycle of the braking waveform in a last half cycle of the braking waveform is shorter than the first half cycle.
5. The haptic output device according to claim 1 , wherein the actuator includes a vibrating body, an elastic member that supports the vibrating body such that the vibrating body vibrates linearly, and a coil that applies an electromagnetic force to the vibrating body.
6. An electronic device comprising the haptic output device according to claim 1 .
7. The haptic output device according to claim 1 , wherein
the braking waveform includes:
a first braking waveform, which follows the third driving waveform, in a fourth half cycle, and
a second braking waveform, which follows the first braking waveform, in a fifth half cycle;
a voltage value of the first braking waveform has a polarity opposite to a polarity of a voltage value of the first driving waveform; and
a voltage value of the second braking waveform has a polarity opposite to the polarity of the voltage value of the second driving waveform.