TDK's PiezoHapt technology is a thin vibration module consisting of a laminated piezoelectric device and a vibrating plate. The tactile feedback technology of vibration and tactile feedback are mainly used. HapTIcs refers to the technique of transmitting information through skin sensory feedback such as force and vibration. TDK's PiezoHapt actuator is a thin vibration module consisting of a laminated piezoelectric device and a vibrating plate. Although it is driven by a low voltage, it can cope with various vibration forms. Compared to previous eccentric motors or linear actuators (linear vibrators) used to cope with equipment vibration, this product has no mounting restrictions and can be used in a variety of applications where feedback is required through skin feel. The PiezoHapt actuator is a single crystal structure actuator that bonds ceramic piezoelectric devices with electrodes mounted on one side to one side of a metal plate. When an alternating voltage is applied to the electrodes, the piezoelectric device expands and contracts, and thus the bonded metal plate is bent. Its performance is shown in the figure below. By alternating the additional voltage, the metal plate will repeatedly bulge, sink and bend, resulting in vibration. By using the single crystal structure, the entire metal plate can be efficiently vibrated. Piezoelectric devices are available in both single-plate and laminated versions, but PiezoHapt actuators have a laminated piezoelectric device that produces greater displacement than single-plate devices of the same thickness. To this end, TDK's PiezoHapt actuator delivers vibrational sensation to the skin with a low voltage of 24V compared to conventional piezoelectric haptic feedback techniques that require high voltage. At the same time, since the device is not required to be soldered using a metal wire, the amplitude efficiency can be improved without burdening the laminated device. The starting speed is 1/25 of the eccentric motor, and it can cope with multiple vibration forms. PiezoHapt's features make it less power-consuming than eccentric motors, providing real-time vibration. An eccentric motor or linear actuator is generally an actuator for a vibrator. However, these products have the disadvantage of slow response. For example, when manufacturing a device that can feel the unevenness when touching the display by hand, the response speed must be faster than that of the existing actuator. To this end, the implementation of more advanced haptic feedback technology still faces many problems. TDK's PiezoHapt actuators provide instant response through piezoelectric properties. The chart below compares the eccentric motor to the PiezoHapt drive. The eccentric motor starts more than 0.1 second, while the PiezoHapt actuator starts at only 1/25. At the same time, since the PiezoHapt actuator can be operated with a short-time power supply compared to the eccentric motor, the low power consumption is also one of its characteristics. The higher the frequency or voltage of the input, the higher the power consumption, but the power can be saved by optimizing the vibration. Since the PiezoHapt actuator amplitude can be changed by changing the driving voltage, a variety of vibration forms can be expressed delicately. This is not possible with eccentric motors. In addition, the eccentric motor is difficult to transmit vibrations away from the mounting position, but the PiezoHapt actuator transmits vibration evenly throughout. With this feature, strong vibrations can be transmitted to the entire display or touch screen. In addition to forming a uniform vibration, it can also detect the position of the fingertip and change the vibration according to the position. The higher driving voltage is the difficulty of piezoelectric type, but TDK's PiezoHapt actuator overcomes this difficulty by using a laminated device, thereby realizing the functions that the eccentric motor cannot achieve, and further expanding the tactile feedback using vibration. The possibility of using technology. PiezoHapt is mainly used in display devices, wearable devices, car navigation, touch screens, controllers and other devices that require feedback through skin sensation.
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