VISUAL AND MAGNETIC RECORDING SYSTEM

摘要

Disclosed is a system for visually and magnetically recording data indicative of characters on opposite sides of a paper sheet having a magnetizable backing. The data are recorded with a typewriter which includes a head for recording coded magnetic bits indicative of each character visually printed on the sheet. The head is coreless and is comprised of a plurality of windings, only certain of the windings write or record bipolarity magnetic bits onto the backing, the remaining windings serve as both spacer and erase windings. Recording is accomplished by feeding large amplitude, short duration current pulses to the recording windings. The magnetic bits for each magnetically recorded character are selectively erased by applying bipolarity, low duty-cycle pulses of successively lower amplitudes to the backing by way of the windings and different modes of erasing various areas on the recording medium are disclosed. Also disclosed is a system for decoding the magnetic bits stored on the backing, wherein a head sequentially scans a rotating line of magnetic bits and sequentially reads out each character of the line. The entire document is read by stepping the head from line to line.