Magneto-optical printing head and method of grey-scale image gen

Details Magneto-optical printing head and method of grey-scale image gen Magneto-optical printing head and method of grey-scale image gen

1985-09-12

1987-12-22

Punter, William H.

G02F 109

Patent

active

047143258

ABSTRACT:
Magneto-optical printing head for generating a grey-scale image on a recording substrate has a magneto-optical light-switching mask with light-switching elements which are switched thermomagnetically by the simultaneous positive or negative effect of heat pulses selectively generated from thin-film resistors applied to the light-switching elements. A magnetic field is applied to a coil between two possible states with in each case the direction of magnetization either parallel or antiparallel to the surface normals, whereby individual time control of the light-switching elements in n possible steps is effected by the single switching of all light-switching elements into the (first) starting state by the action of the positive magnetic field generated by the coil and subsequent switching into the second state by means of a second static magnetic field whose direction is opposite to that of the magnetic field of the coil, and by the action of heat pulses of n-1 point in time. The static magnetic field is generated by an arrangement of permanent magnets situated close to the light-switching elements.

REFERENCES:
patent: Re32099 (1986-03-01), Hill et al.
patent: 4449153 (1984-05-01), Tschang
patent: 4495492 (1985-01-01), Anderson et al.
patent: 4609257 (1986-09-01), Shirasaki
Gosch, J., "Magneto-Optics Begets New Display Technology", Electronics, 12-29-81, pp. 53-54.

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