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AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasayoshi Kamo, Kazuo Hasegawa, Atsuo Onoda, Yuuji Oomura, Masao Sato, Hidetada Nagaoka, Yukio Izumi, Akira Hashimoto, Keiichi Nishikawa, Yoichi Muratomi, Yasutaka Mizutani
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A head assembly moving along a long side of a magnetic card, more than one magnetic head rotating in the head assembly for reading/writing data, a rotary transformer and a carriage with a card holding mechanism for keeping a card at a predefined position are provided in a card reader of the present invention. A rotating part of the rotary transformer in the head assembly receives and sends a signal to the magnetic head and a fixing part of the rotary transformer is connected to a reading/writing circuit. On the card of the present invention, which is usually rectangular, there are tracks defined by plural arcs. The arcs are on plural same-size circles whose centers are aligned on one line along the long side of the card. A magnetic card or an optical card can be used for the present invention.
A card for recording a data, comprising a recording area having a plurality of recording tracks for recording data, wherein the plurality of recording tracks includes a plurality of sets of two arc tracks, each set being located at a place on one circumference of the card, and wherein radii of circumferences at the sets are substantially identical and centers of circumferences of the sets are aligned along a common linear axis and separated from one center point to the next center point by a predetermined pitch and wherein each set is arranged to be selectively accessed during a rotation of an access head about said one circumference and while said access head is centered at a single center point that is stationary along said common linear axis during said rotation about said one circumference, wherein the arc tracks have a track pitch P=X/cos .alpha. wherein x is a track width and .alpha. is a half of a center angle of the arc tracks.
Dependencies are inferred from the claim text.