| 摘要 |
A remote control transmitter (1) detects motion in a specific direction or in a rotational direction around a specific axis. The transmitter (1) includes a battery (16) placed on a bottom surface side within a case (2) containing the circuitry of the transmitter (1). The bottom surface side has a convex surface, with a center of curvature (C) coincident in the upward direction of the force of gravity above a center of gravity (G) of the transmitter (1). When placed on a flat surface, the transmitter (1) assumes a stable orientation such that when the transmitter (1) is grasped in order to perform a motion-based operation, it can be can be assumed that the vertical direction is the direction of the line joining the center of curvature (C) of the stable portion to the center of mass (G), as an absolute direction for reference in detecting the motion operation. |
