| 摘要 |
The present invention relates to an array ultrasound transducer for diagnosis through a polarization inversion and the adjustment of a thickness ratio of multiple piezoelectric elements and a manufacturing method thereof, and more specifically, to an array ultrasound transducer which is manufactured to have each of a high frequency broadband characteristic and a multi- frequency harmonic wave characteristic by means of the inversion and thickness ratio adjustment of multiple piezoelectric elements. The transducer also has a basic frequency which is improved as much as 1.5 times compared with the frequency of a single piezoelectric element structure, and an improved -6dB bandwidth when the transducer has a high frequency broadband characteristic. Therefore, due to the characteristics, the transducer easily improves the resolution of ultrasound images. When having a multi-frequency harmonic wave characteristic, the transducer is useful to implement images of the ultrasound harmonic wave because the basic frequency component is identical with that of a single piezoelectric element structure and the harmonic wave frequency component is greatly improved. By means of a valley generated between the basic frequency and the harmonic wave frequency, a filter to extract only the harmonic wave frequencies can be easily applied. The present invention is manufactured to be selectively used to have the two characteristics of the high frequency broadband and the multi-frequency harmonic wave in one array ultrasound transducer by consecutively arranging each element having the aforementioned characteristics, such that a user selectively adjusts characteristics appropriated to the diagnosis purpose. Manufacturing such array ultrasound transducer minimizes the use of an accurate cutter and designs the method similarly to a manufacturing method of the existing ultrasound transducers, thereby preventing damage to piezoelectric elements, and reducing time and costs during the manufacturing process. |
