Analog Behavioral Model for Circuit Simulation (PSpice Network Listing).AlCap Useful Life Calculation Tool - Web-based Application.Further TDK Electronics Sample Kits at Digi-Key.Application Specific IC (ASIC) Development and Supply.CeraCharge - Rechargeable solid-state SMD battery.Substrates for High Power and Fast Switching Semiconductors.Switching / Heating, Piezo Components, Contactors, Buzzers, Microphones.Components for PFC and Harmonic Filtering.Piezoelectric elements can be used not only for the sense of touch but also the sense of hearing. This indicates that a very wide range of vibration frequencies can be created, including the range of human hearing (generally taken to be 20 Hz–20 kHz), which means that the element can also be used as a speaker. So far, the explanation focused on the sense of touch (tactile sensation), but as mentioned above, piezo elements have a very high resonance frequency (several tens of kHz). With an LRA device, shapes can be discerned to a certain extent, but details are still lacking, so the picture is still somewhat blurry.Ī piezoelectric device provides detailed information and therefore allows the identification of details.įurthermore, the piezoelectric element can be made smaller and thinner than ERM or LRA devices, which is especially desirable in the ICT sector where miniaturization is a major consideration.Īn additional application of piezoelectric elements The vibration produced by an ERM device simply indicates that "something is there" but provides no further information, which is represented by the blurred picture at left. (The graph below shows an example of the input / output response of a TDK product.) Therefore it is possible to freely control the vibrations in the important range of 50 to 500 Hz, creating tactile sensations that closely resemble the real sense of touch. In the case of LRA products, the frequency and amplitude can be adjusted to a certain degree, but because the resonance frequency of the product itself is around 150 to 300 Hz, finely detailed tactile control is difficult to achieve.īy contrast, the resonance frequency of a piezoelectric element is in the tens of kHz, which does not affect the sense of touch. Two types of products that are currently in wide use as haptic devices are Eccentric Rotating Mass (ERM) and Linear Resonant Actuator (LRA).ĮRM products can only vibrate with a sine wave at a specific frequency. piezoelectric devices) superior as haptic devices? Why are products using the piezoelectric effect (i.e. (The smaller the sine wave threshold, the higher the sensitivity.)įrom the graph it can be seen that humans are able to perceive vibrations in the frequency range of about 50 to 500 Hz as a sense of touch, and that the sensitivity is especially high around 200 Hz. ![]() ![]() The graph shown at left illustrates the function of these Pacinian corpuscles. ![]() So-called Pacinian corpuscles located under the skin are one of the sensor types responsible for the actual sense of touch. In particular, the sense of touch relies on the skin covering the entire body to provide sensory information, making it the largest sensory organ among the five senses. The human five senses (sight, hearing, touch, taste, smell) are supported by 'sensors' that work in different ways.
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