Abstract: A telescopic speaker box, and an audio player and an electronic apparatus using the same are provided. The audio player comprises a loudspeaker unit and a telescopic speaker box. The telescopic speaker box comprises a speaker box housing whose volume is adjustable. The speaker box housing has a hole. The hole is used for receiving the loudspeaker unit. By adjusting the volume of the speaker box housing, a lowest resonant frequency of the telescopic speaker box can be achieved.

Abstract: A system of angular displacement control for micro mirrors includes a stationary vertical element, a stationary horizontal element and an interference eliminator. Alternatively, the stationary horizontal element holds micro mirrors in place during transportation for avoiding vibration and collision. The stationary vertical element orientates the micro mirrors in the vertical position. The interference eliminator eliminates magnetic interference that could affect the operation of the micro mirrors. The micro mirrors having interference eliminators are capable of remaining unaffected by operations of other micro mirrors.

Abstract: A system of angular displacement control for micro mirrors includes a stationary vertical element, a stationary horizontal element and an interference eliminator. Alternatively, the stationary horizontal element holds micro mirrors in place during transportation for avoiding vibration and collision. The stationary vertical element orientates the micro mirrors in the vertical position. The interference eliminator eliminates magnetic interference that could affect the operation of the micro mirrors. The micro mirrors having interference eliminators are capable of remaining unaffected by operations of other micro mirrors.