Ultrasonic device and inspection device

An ultrasonic device, comprising:

• an ultrasonic transmitter, the ultrasonic transmitter including a first element, a second element, a supporter, and a driver,
• the first element including a first member region, a first electrode, a first counter electrode provided between the first member region and the first electrode, and a first piezoelectric layer provided between the first electrode and the first counter electrode and supported by the supporter;
• the second element including a second member region, a second electrode, a second counter electrode provided between the second member region and the second electrode, and a second piezoelectric layer provided between the second electrode and the second counter electrode and supported by the supporter;
• the driver being configured to supply a first electrical signal between the first electrode and the first counter electrode and to supply a second electrical signal between the second electrode and the second counter electrode, the second electrical signal being different from the first electrical signal;
• the second element having at least one of a second length or a second thickness, the second length being different from a first length, the second thickness being different from a first thickness;
• the first length being a length of the first piezoelectric layer along a second direction crossing a first direction, the first direction being from the first counter electrode toward the first electrode;
• the second length being a length of the second piezoelectric layer along the second direction;
• the first thickness being a thickness of the first member region along the first direction;
• the second thickness being a thickness of the second member region along the first direction;
• the supporter including a first hole and a second hole;
• the first electrode overlapping the first hole in the first direction;
• the second electrode overlapping the second hole in the first direction;
• the first piezoelectric layer including a first region overlapping the first hole in the first direction, the first region not overlapping the first electrode in the first direction;
• and
• the second piezoelectric layer including a second region overlapping the second hole in the first direction, the second region not overlapping the second electrode in the first direction,
• wherein the first electrical signal includes a first signal having a first frequency and substantially not including a second frequency, and
• the second electrical signal includes a second signal having the second frequency and substantially not including the first frequency.