MATRIX ADDRESSING FOR THIN FILM MAGNETIC HEAD ARRAYS
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Full width, head-per-track, thin film magnetic head arrays generally have considerable cost and recording speed advantages over rotary recording systems, when used for electronic image input to magnetographic printing systems. Since thin film heads require high currents (about an amp per head), it is desirable to minimize the number of wires and connectors, so that parallel addressing of the entire array (3000-6000 elements) is out of the question. Thus, some form of matrix addressing is required which minimizes both the electric current demands and the number of wires. Consideration of the latent image requirements, switching rates, recorded spot size, process speed, thermal considerations, and electric current limitations lead to some design constraints regarding matrix addressed head arrays for magnetic imaging; for example, shared lead designs may not be compatible with latent image requirements and, therefore, some parallel as well as sequential addressing will have to be employed to keep up with copier process speeds.