| 摘要 |
An input apparatus allowing the improved operability of data entry without noticeable volume changes of a portable device itself and further allowing easy entry of a positional coordinate, a curve, and the like is disclosed. The input apparatus is detachably coupled to the portable device and is provided with a coordinate information generator for generating coordinate information depending on a movement on a flat surface to control a position of a cursor on a display of the portable device. Therefore, the input apparatus is removed from the portable device and the singly input apparatus can output coordinate information to the portable device by sliding it on a desk. The input apparatus preferably incorporates a battery for supplying power to the portable device when the input apparatus is coupled to the portable device.
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