Abstract: A head for producing magnetic images of fine detail, including a group of recording elements spaced perpendicular to the movement of a magnetic tape and a power source that passes current pulses through the recording elements to create magnetic fields that magnetize small regions of the tape. Each recording element includes an elongated conductor with a thin nickel layer nearest the magnetic tape and a thick copper layer on the side of the nickel layer opposite the tape, the copper layer having a small gap therein at a predetermined recording location. Accordingly, the center of current flow is normally through a middle portion of the copper which is too far from the magnetic tape for the resulting magnetic field to magnetize the tape, except at the recording location where the current passes through the nickel layer which is close enough to the tape to magnetize it.

Abstract: A copying machine which includes a thin flexible sheet with a layer of chromium dioxide, a lamp for shining light at the sheet and a document to be copied to form a magnetic image on the chromium dioxide layer, a drum having a layer of nickel cobalt, a transfer head for pressing the sheet against the drum while applying an anhysteretic magnetic field to them to transfer the magnetic image to the nickel cobalt, an applicator for applying toner to the drum, and a mechanism for pressing sheets of paper against the drum to transfer the toner to the paper. The nickel cobalt layer has a lower coercivity but higher remanence than the chromium dioxide, so that the magnetic field on the drum can be of greater strength than the original magnetic field on the chromium dioxide layer. Also, the nickel cobalt layer on the drum is a smooth continuous metallic layer which can perform better printing than the nonmetallic chromium dioxide particles which are held in a resinous binder on the flexible sheet.