A process for the preparation of acid halides of formula Iwhich are useful as intermediates in the preparation of i. The main shaft 30 is not inclined in the machine tool. 5% to 50% by weight of the fluoropolymer, heating the dispersion up to a temperature Tc in a range of CP\xb110\xb0C. The composition of the above phosphor is represented by chemical formula:. Thus, the connector is properly positioned relative to the mating connector by the magnetic force. This configuration makes it possible to provide the scheme for searching for the high-speed and high-accuracy motion vector, and the image coding device for performing this motion search.