Abstract: The invention provides a tread thickness measuring method for accurately measuring the tread thickness from a belt surface located in an outermost position in a tire to the tread surface by an ultrasonic measurement irrespective of the material of the belt. The method includes the steps of spraying the same liquid as the liquid pooled in a tank on the tread surface of the tire under inspection before immersing the tread surface in the liquid in the tank and measuring the depth of the belt located in the outermost position in the tire by emitting ultrasonic waves to the tread surface immersed in the liquid in the tank and receiving the reflected waves.

Abstract: A display unit includes: a display section having a plurality of light-emitting devices arranged in a straight line; a driving section supplying a display driving signal for controlling the luminance of each of the light-emitting devices; and a display control section connected to the driving section for supplying the driving section with either a first display control signal for controlling the luminance of the light-emitting devices to display a preset display pattern according to an operation control signal from a controller or a second display control signal for controlling the luminance of the light-emitting devices in synchronism with the level of an audio signal, wherein the first display control signal is generated based on a wave function.

Abstract: The invention provides a tread thickness measuring method for accurately measuring the tread thickness from a belt surface located in an outermost position in a tire to the tread surface by an ultrasonic measurement irrespective of the material of the belt. The method includes the steps of spraying the same liquid as the liquid pooled in a tank on the tread surface of the tire under inspection before immersing the tread surface in the liquid in the tank and measuring the depth of the belt located in the outermost position in the tire by emitting ultrasonic waves to the tread surface immersed in the liquid in the tank and receiving the reflected waves.

Abstract: A display unit includes: a display section having a plurality of light-emitting devices arranged in a straight line; a driving section supplying a display driving signal for controlling the luminance of each of the light-emitting devices; and a display control section connected to the driving section for supplying the driving section with either a first display control signal for controlling the luminance of the light-emitting devices to display a preset display pattern according to an operation control signal from a controller or a second display control signal for controlling the luminance of the light-emitting devices in synchronism with the level of an audio signal, wherein the first display control signal is generated based on a wave function.