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electrostatic pickup
An electrostatic pickup converts mechanical motion to an electrical signal by means of varying electrical capacitance. This type of pickup, in which the moving plate is a vibrating metal reed, is used in some types of electronic pianos and organs as an inexpensive method of generating tones.
==Principle of operation==
The electrostatic pickup consists of a capacitor with one stationary plate and one moving plate. The moving plate is typically a steel or brass reed, anchored at one end and free to vibrate at the other end. Another fixed plate is suspended near the vibrating reed, but is electrically insulated.
A high voltage is applied between the stationary and moving plates to produce an electric field. The motion of the moving plate induces a varying current through the capacitor formed by the reed and the fixed plate.
The capacitance of the pickup is changed by the motion of the moving plate. As a result of the changing capacitance, a varying current flows into or out of the plates as needed to maintain the proper charge for the new amount of capacitance. This current produces a varying voltage across an external resistor which is amplified to produce a usable output signal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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