この研究では、私たちの生徒の予温劲を維持するための続き、 we propose a method to protect ultrasonic transducer which can provide tactile sensation. Conversion method and inefficient because all transducer try to contribute to the focus formation to all target point.In the proposed method only transducer that contributes the focus formation enable based on the normal direction of the surface. As a result, this method allows each transgender to be used efficiently to generate strong pressure. Thank you for listening!