Abstract: Detailed information about plural factors determining a color and the coordinate value of a pointed position are determined from a position pointing device. The detailed information about the plural colors is by factors such as detailed gradation information on basic colors such as red, green, and blue. The amplitude or frequency of an AC field is controlled in accordance with the set color information. The AC field has a spatial distribution corresponding to the coordinate value of the pointed position.

Abstract: A position detecting device and a position pointing device therefor, which are capable of sending various types of instructions from a tablet to a cordless position pointing device, thus controlling the operation thereof. The tablet is equipped with an instruction generating means and an electromagnetic wave transmitting means to transmit an electromagnetic wave, which includes an operation state setting instruction, to the position pointing device. The position pointing device is equipped with an electromagnetic wave receiving means, an instruction extracting means, and an operation setting means to receive the electromagnetic wave, which includes the operation state setting instruction, extract the operation state setting instruction, and set the operation state in accordance with the extracted operation state setting instruction, thus enabling the operation state of the position pointing device to be set.

Abstract: A position detecting apparatus has a plurality of magnetostrictive transmission medium elements which are arranged substantially in parallel with one another. A first coil and a second coil are wound around these elements such that signals are exchanged between these coils through the intermediary of the magnetostrictive transmission medium elements. The electric-mechanical coupling coefficient of the magnetostrictive transmission medium elements is locally changed by a magnetism from a position appointing magnetism generator so as to appoint a position on a plane provided by the magnetostrictive transmission medium elements, and the appointed position is detected through detection of a change in the timing of a signal caused by the local change in the above-mentioned coefficient. The position appointing magnetism generator is not connected to any portion of the stationary part of the apparatus.