ULTRASONIC DETECTION DEVICE AND ULTRASONIC DIAGNOSTIC DEVICE
First Claim
1. An ultrasonic detection device, comprising:
- a capacitive electromechanical transducer including a cell that includes a first electrode and a second electrode disposed so as to oppose with a space;
a voltage source for developing a potential difference between the first electrode and the second electrode; and
an electric circuit for converting a current, which is caused by a change in electrostatic capacitance between the first electrode and the second electrode due to vibration of the second electrode, into a voltage,wherein the capacitive electromechanical transducer provides an output current with a high-pass characteristic having a first cutoff frequency with respect to a frequency,wherein the electric circuit provides an output with a low-pass characteristic having a second cutoff frequency with respect to the frequency, andwherein the second cutoff frequency is smaller than the first cutoff frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is an ultrasonic detection device including: a capacitive electromechanical transducer including a cell that includes a first electrode and a second electrode disposed so as to oppose with a space; a voltage source for developing a potential difference between the first electrode and the second electrode; and an electric circuit for converting a current, which is caused by a change in electrostatic capacitance between the first electrode and the second electrode due to vibration of the second electrode, into a voltage, in which the capacitive electromechanical transducer provides an output current with a high-pass characteristic having a first cutoff frequency with respect to a frequency, the electric circuit provides an output with a low-pass characteristic having a second cutoff frequency with respect to the frequency, and the second cutoff frequency is smaller than the first cutoff frequency.
-
Citations
6 Claims
-
1. An ultrasonic detection device, comprising:
-
a capacitive electromechanical transducer including a cell that includes a first electrode and a second electrode disposed so as to oppose with a space; a voltage source for developing a potential difference between the first electrode and the second electrode; and an electric circuit for converting a current, which is caused by a change in electrostatic capacitance between the first electrode and the second electrode due to vibration of the second electrode, into a voltage, wherein the capacitive electromechanical transducer provides an output current with a high-pass characteristic having a first cutoff frequency with respect to a frequency, wherein the electric circuit provides an output with a low-pass characteristic having a second cutoff frequency with respect to the frequency, and wherein the second cutoff frequency is smaller than the first cutoff frequency. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification