Abstract: A method of driving a vibration device including a light-transmitting body and a piezoelectric element connected to the light-transmitting body is provided to vibrate the light-transmitting body. The method atomizes and removes liquid drops sticking to the light-transmitting body. A driving voltage to vibrate the piezoelectric element is swept at a sweep speed in a range of about 1 Hz to about 50 Hz so as to sweep a vibration frequency of the piezoelectric element to cover a frequency range including both of a resonant frequency of the light-transmitting body without liquid drops sticking to the light-transmitting body and a resonant frequency of the light-transmitting body with the liquid drops sticking to the light-transmitting body.

Abstract: A method of driving a vibration device including a light-transmitting body and a piezoelectric element connected to the light-transmitting body is provided to vibrate the light-transmitting body. The method atomizes and removes liquid drops sticking to the light-transmitting body. A driving voltage to vibrate the piezoelectric element is swept at a sweep speed in a range of about 1 Hz to about 50 Hz so as to sweep a vibration frequency of the piezoelectric element to cover a frequency range including both of a resonant frequency of the light-transmitting body without liquid drops sticking to the light-transmitting body and a resonant frequency of the light-transmitting body with the liquid drops sticking to the light-transmitting body.

Abstract: A shift from a scroll mode to a pointer mode is more securely caused with a simple operation. A mobile phone (10) includes: a display section (14); a touch pad (16) having a detection region at a location outside a display region, an event identifying section (21) configured to identify a type of a touch event based on location information received from the touch pad (16); and a mode switching section (23) configured to switch a scroll mode, in which a screen is scrollable, to a pointer mode, in which a displayed object is selectable, in a case where a single tap is inputted in the scroll mode.

Abstract: An object of the present invention is to realize a simpler operation in an information processing apparatus including a display section and an object detecting section. A mobile phone (10) including a display section (14) and a touch pad (16) undergoes a transition from a pointer mode to a scroll mode in a case where a touch duration time passed beyond a threshold time (T1), and performs an action corresponding to a position of a pointer in a case where the touch duration time passed beyond a threshold time (T2).