Electrostatic capacitance type transducer

An electrostatic capacitance type transducer having an operational central frequency fc, comprising P cells,

• wherein each of the P cells includes a first electrode and a second electrode arranged with a gap therebetween,
• wherein the second electrode is electrically connected to a signal extraction electrode that is shared among the P cells,
• wherein the P cells have different wiring lengths from the signal extraction electrode, and
• wherein fc≤1/(2×π×P2×ΔRs×ΔCs) is satisfied, where ΔCs is electrostatic capacitance of each of the P cells, ΔRs is wiring resistance between two adjacent cells in the P cells.

An electrostatic capacitance type transducer having an operational central frequency, comprising:

• one or more elements each of which includes N cell groups and a signal extraction electrode that is shared among the N cell groups,
• wherein each of the N cell groups includes P cells,
• wherein each of the P cells includes a first electrode and a second electrode arranged with a gap therebetween,
• wherein the second electrode is electrically connected to the signal extraction electrode,
• wherein N and P are positive integers,
• wherein, in each of the N cell groups, each of the P cells has an equal wiring length from the signal extraction electrode, and
• wherein the operational central frequency is less than or equal to an expression scaled by N.

An electrostatic capacitance type transducer having an operational central frequency, comprising P cells,

• wherein each of the P cells includes a first electrode and a second electrode arranged with a gap therebetween,
• wherein P is a positive integer,
• wherein the second electrode is electrically connected to a signal extraction electrode,
• wherein the P cells have different wiring lengths from the signal extraction electrode, and
• wherein the operational central frequency is less than or equal to an expression scaled by P.