Abstract: A coin storage device includes: storage compartments that store therein coins by denomination; and screw-type conveying members, installed for the respective storage compartments, each of the screw-type conveying members including a shaft having an elongated shape and having an outer circumferential surface provided with a blade portion that protrudes radially outwards in a spiraling shape, and conveying coins toward a front side by being rotated in one direction about a central axis of the shaft. Further, each of the screw-type conveying members includes an actuating portion to move center of gravity of coins accumulated on the actuating portion up and down periodically as the screw-type conveying member is rotated about the central axis of the shaft.

Abstract: A semiconductor device includes a switching element including a control electrode, a first main electrode, and a second main electrode: a gate driver connected between the control electrode and the first main electrode, configured to transmit a gate drive signal for driving the control electrode; a Miller voltage detector detecting a Miller voltage between the control electrode and the first main electrode when the switching element turns off; a current value detector detecting a principal current flowing through the switching element; and a temperature calculator calculating a temperature of the switching element from the detected Miller voltage and principal current.