Pickup sensor and biological sensor
Provided are a pickup sensor and a biological sensor that are small-sized and can detect micro vibration efficiently and stably with high accuracy. The pickup sensor includes 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, in which 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 opposite to the abutting surface is grounded.
1. 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 electroacoustic converter film is folded, and
the thin film electrode that is laminated on an outside main surface of the folded electroacoustic converter film is grounded, and
wherein the protective layer is laminated on an outside main surface of the folded electroacoustic converter film.
2. The pickup sensor according to claim 1 ,
wherein the electroacoustic converter film is curved and held so as to protrude to one main surface.
3. The pickup sensor according to claim 2 , further comprising:
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,
wherein the elastic support is disposed to adhere to a main surface of the electroacoustic converter film on the grounded thin film electrode side.
4. The pickup sensor according to claim 3 , further comprising:
an elastic holding member that is formed in a C-shape,
wherein the holding member presses and holds the electroacoustic converter film against the test object.
5. The pickup sensor according to claim 4 , further comprising:
a suction cup member,
wherein the electroacoustic converter film is disposed at a center of an adsorption surface of the suction cup member.
6. A biological sensor comprising:
the pickup sensor according to claim 5 .
7. A biological sensor comprising:
the pickup sensor according to claim 4 .
8. A biological sensor comprising:
the pickup sensor according to claim 3 .
9. A biological sensor comprising:
the pickup sensor according to claim 2 .
10. A biological sensor comprising:
the pickup sensor according to claim 1 .
11. 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.
12. A biological sensor comprising:
the pickup sensor according to claim 11 .
13. 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.
14. A biological sensor comprising:
the pickup sensor according to claim 13 .
15. 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.
16. A biological sensor comprising:
the pickup sensor according to claim 15 .