Pickup sensor and biological sensor

A pickup sensor comprising an electroacoustic converter film including:

• a piezoelectric polymer composite in which piezoelectric particles are dispersed in a viscoelastic matrix that is formed of a polymer material having viscoelasticity at normal temperature;
• two thin film electrodes that are laminated on opposite surfaces of the piezoelectric polymer composite, respectively;
• and
• a protective layer that is laminated on at least one of the two thin film electrodes,
• wherein at least a part of a surface of the electroacoustic converter film is an abutting surface that abuts against a test object, and
• the thin film electrode on a surface of the electroacoustic converter film opposite to the abutting surface is grounded,
• wherein the pickup sensor further comprises:
• an elastic support that is disposed to adhere to one main surface of the electroacoustic converter film such that the electroacoustic converter film is curved, and
• wherein the elastic support is disposed to adhere to a main surface of the electroacoustic converter film on the grounded thin film electrode side.

A pickup sensor comprising an electroacoustic converter film including:

• a piezoelectric polymer composite in which piezoelectric particles are dispersed in a viscoelastic matrix that is formed of a polymer material having viscoelasticity at normal temperature;
• two thin film electrodes that are laminated on opposite surfaces of the piezoelectric polymer composite, respectively;
• and
• a protective layer that is laminated on at least one of the two thin film electrodes,
• wherein at least a part of a surface of the electroacoustic converter film is an abutting surface that abuts against a test object, and
• the thin film electrode on a surface of the electroacoustic converter film opposite to the abutting surface is grounded,
• wherein the pickup sensor further comprises:
• an elastic holding member that is formed in a C-shape, and
• wherein the holding member presses and holds the electroacoustic converter film against the test object.

A pickup sensor comprising an electroacoustic converter film including:

• a piezoelectric polymer composite in which piezoelectric particles are dispersed in a viscoelastic matrix that is formed of a polymer material having viscoelasticity at normal temperature;
• two thin film electrodes that are laminated on opposite surfaces of the piezoelectric polymer composite, respectively;
• and
• a protective layer that is laminated on at least one of the two thin film electrodes,
• wherein at least a part of a surface of the electroacoustic converter film is an abutting surface that abuts against a test object, and
• the thin film electrode on a surface of the electroacoustic converter film opposite to the abutting surface is grounded,
• wherein the pickup sensor further comprises:
• a suction cup member, and
• wherein the electroacoustic converter film is disposed at a center of an adsorption surface of the suction cup member.