A drumhead includes a membrane with ferrous responsive material printed onto a surface or otherwise incorporated into it. The ferrous responsive material is detectable by an electromagnetic sensor such that striking the membrane causes vibration that is detected by the sensor, which may initiate an acoustic sound via a sound module. The drumhead may thus be used in an electronic drumming system without requiring fixation of a foreign object to a surface of the membrane.

Provided is an electroacoustic converter film including: a polymeric composite piezoelectric body having piezoelectric particles dispersed in a viscoelastic matrix which is formed of a polymer material exhibiting viscoelasticity at ordinary temperatures; thin film electrodes formed on both sides of the polymeric composite piezoelectric body; and protective layers formed on surfaces of the thin film electrodes. The electroacoustic converter film serves as a speaker capable of being integrated with a flexible display without impairing lightweightness or flexibility, and has considerable frequency dispersion in the storage modulus and also has a local maximum of the loss tangent around ordinary temperatures. A flexible display, a vocal cord microphone and a musical instrument sensor, in each of which the electroacoustic converter film is used, are also provided.

The disclosure provides a detection device, a percussion instrument, and a detection method. The percussion instrument includes a head; a base that has at least a portion formed in a curved shape and that is in contact with the head in a direction in which a curvature of the curved shape is changed with a vibration of the head; and a film-shaped piezoelectric sensor disposed on the base.

Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 μm.

An electronic percussion instrument includes a body having a top opening and an internal support area, and a drumhead having a striking surface and a drumhead bottom surface opposite thereto, the drumhead is stretched over the top opening of the body and is configured to receive a percussion strike thereon, and at least one peripheral sensor disposed on the internal support area of the body, and at least one rising element configured to be flexible and disposed on the internal support area of the body, and a peripheral carrier, adapted to receiving vibrations from the periphery of the drumhead, the peripheral carrier is supported by the at least one rising element such that a pressing force is formed for setting a top circumferential edge of the peripheral carrier in contact with the drumhead bottom surface.

An electronic percussion instrument includes a body having a top opening and an internal support area, and a drumhead having a striking surface and a drumhead bottom surface opposite thereto, the drumhead is stretched over the top opening of the body and is configured to receive a percussion strike thereon, and at least one peripheral sensor disposed on the internal support area of the body, and at least one rising element configured to be flexible and disposed on the internal support area of the body, and a peripheral carrier, adapted to receiving vibrations from the periphery of the drumhead, the peripheral carrier is supported by the at least one rising element such that a pressing force is formed for setting a top circumferential edge of the peripheral carrier in contact with the drumhead bottom surface.

A sensor output device includes a sensor and an output circuit. The sensor includes a piezoelectric element and an output terminal. The piezoelectric element includes porous resin. The output circuit is connected to the output terminal of the sensor and includes a thermistor.

A drumhead includes a membrane with ferrous responsive material printed onto a surface or otherwise incorporated into it. The ferrous responsive material is detectable by an electromagnetic sensor such that striking the membrane causes vibration that is detected by the sensor, which may initiate an acoustic sound via a sound module. The drumhead may thus be used in an electronic drumming system without requiring fixation of a foreign object to a surface of the membrane.

Provision of a piezoelectric element which uses a lightweight and flexible electret material and an electrode layer which is also lightweight, has high conductivity and good flexibility to easily receive electrical signals from an electret, and has good durability. Additionally, provision of a musical instrument provided with such a piezoelectric element. A piezoelectric element comprising an electrode layer (B) on at least one surface of an electret material (A) having pores inside, wherein a porosity of the electret material (A) is 20 to 80%, the electrode layer (B) contains 20 to 70 mass % of a carbon fine particle, and a thickness of the electrode layer (B) is 2 to 100 m.

A controller for musical instrument models is presented, comprising acoustic elements with embedded vibration sensors that the user actuates for example by plucking, strumming, or striking the elements. A vibration sensor attached to each acoustic element is used to generate an excitation signal for musical instrument models. A note input interface can be included so that note input such as MIDI can be used to control the musical pitch of the musical instrument models.