Tactile presentation device

A tactile presentation device including a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob, the tactile presentation device comprising:

• a tactile electrode that includes a plurality of first electrodes and a plurality of second electrodes provided inside the operation screen of the tactile presentation device;
• a dielectric layer that covers the tactile electrode and has one surface serving as the operation screen;
• and
• a voltage generation circuit that generates a first voltage signal of a first frequency and a second voltage signal of a second frequency different from the first frequency, the first voltage signal being applied to at least one of the first electrodes that is located in a region of at least part of the operation screen of the tactile presentation device, the second voltage signal being applied to at least one of the second electrodes that is located in a region of at least part of the operation screen,
• wherein the tactile sense is presented by supplying the first voltage signal and the second voltage signal to generate a frictional force between the operation screen and the tactile presentation knob,
• the tactile presentation knob includes:
• a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on a side opposite to the operation screen;
• and
• an operation part that fixes the conductive elastic portion,
• the surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate a vibration by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob, and
• the inner layer is set to have higher vibration transmissibility than the surface layer.