Ultrasonic transducer, ultrasonic probe, and photoacoustic apparatus

摘要

An ultrasonic transducer capable of detecting an ultrasonic wave from a low frequency band to a high frequency band while suppressing a decrease in maximum value of reception sensitivity and an increase in minimum received sound pressure. An ultrasonic transducer for receiving an ultrasonic wave emitted from an object irradiated with light, wherein at least a frequency band in which the reception sensitivity is -6 dB or more from the maximum value of the reception sensitivity of the ultrasonic transducer The signal-to-noise ratio of the receiving sensitivity of 0.5 MHz is 1 to 10 MHz, and the minimum receiving sound pressure of the maximum value of the receiving sensitivity is 1 Pa or less, relative to the signal to noise ratio of the maximum value of the receiving sensitivity. An ultrasonic transducer characterized by at least -20 dB. [Selected figure] Figure 4