2results about How to "Small thickness tolerance" patented technology

The embodiment of the invention provides an ultrasonic transducer, a preparation method of the ultrasonic transducer, an ultrasonic fingerprint module and electronic equipment. The preparation method of the ultrasonic transducer comprises the following steps: forming a bottom electrode on the upper surface of a substrate, and forming a piezoelectric layer covering the bottom electrode above the substrate; at least forming a seed metal layer on the upper surface of the piezoelectric layer; a first enclosure structure is formed above the substrate, and a containing space used for preparing a top electrode is defined above the piezoelectric layer through the first enclosure structure; and electrifying the seed metal layer, and electroplating at least the seed metal layer in the accommodating space to obtain a top electrode so as to obtain the ultrasonic transducer. According to the technical scheme provided by the embodiment of the invention, the ultrasonic transducer with relatively good performance can be prepared.

This invention discloses a high-efficiency and energy-saving rolling mill for aluminum profiles, relating to the field of metal rolling technology. The high-efficiency and energy-saving rolling mill for aluminum profiles includes a rolling mill with rolling rollers inside. A drive mechanism is fixedly connected to the front of the rolling mill, and an adjustment mechanism is provided at the top of the rolling mill. The rolling parameters of the drive mechanism can be adjusted through the adjustment mechanism. A feeding mechanism is fixedly connected to the outer wall of the rolling mill on the left side of the drive mechanism, and a discharging mechanism is fixedly connected to the outer wall of the rolling mill on the right side of the drive mechanism. In this high-efficiency and energy-saving rolling mill for aluminum profiles, the rotation of a first cam and a second cam causes the metal plate to vibrate, loosening any adhering substances on the surface of the metal plate. The driven brush strips then remove impurities from the surface of the metal plate, keeping the aluminum metal plate surface clean and preventing pitting defects caused by impurities.