公开(公告)号：DE3888160T2

公开(公告)日：1994-09-15

申请号：DE3888160

申请日：1988-12-08

Applicant: IBM

Inventor： HEDGE SURYANARAYAN GANESH ,  SCRANTON ROBERT ALAN ,  YARMCHUK EDWARD JOHN

IPC: G01B7/14 ,  G11B5/10 ,  G11B5/105 ,  G11B5/48 ,  G11B5/58 ,  G11B5/60 ,  G11B21/21

公开(公告)号：DE3872438T2

公开(公告)日：1993-01-14

申请号：DE3872438

申请日：1988-04-21

Applicant: IBM

Inventor： DOVE DEREK BRIAN ,  KEEFE GEORGE EDWARD ,  YARMCHUK EDWARD JOHN

IPC: B41J2/42 ,  B41J2/43 ,  B41J2/385

Abstract: A magnetographic printing head (26) comprises an array of crossed elongated bar-shaped print elements (58, 62) each of which is individually magnetizable by electrical conductors (40) wound about respective ones of the print elements (58, 62). The print elements (58, 62) are arranged in two parallel arrays which are spaced apart from each other to define a passage (24) through which a magnetic medium (22) is to be passed for the imprinting of marks (66) thereon. A mark (66) can be imprinted at each cross point (64) of the crossed arrays upon application of sufficient magnetizing current to each of the print elements (58, 62) at the cross point (64). The print elements (58, 62) are specifically shaped to provide for concentration of magnetic fields at the cross points (64) in two dimensions to accomplish high resolution printing. The concentration of the fields is accomplished in one embodiment of the invention by the use of a knife-edge (68) configuration to opposed facing surfaces of the elements of the opposed arrays, and in a second embodiment by a set of pedestals (72) upstanding from the elements of one of the arrays. The resulting configuration of the print head (26) has structural simplicity which permits economical fabrication while retaining high resolution in the printing.

公开(公告)号：DE3380676D1

公开(公告)日：1989-11-09

申请号：DE3380676

申请日：1983-06-01

Applicant: IBM

Inventor： FRANASZEK PETER ANTHONY WATSON ,  YARMCHUK EDWARD JOHN

IPC: B41J2/43 ,  G11B5/09 ,  G11B5/127 ,  G11B5/17 ,  G11B5/48 ,  G11B5/00 ,  G03G19/00

Abstract: The drawing diagrammatically illustrates the lay-out of a head array. The array comprises 64 sub-arrays, only sub-arrays B1 and B64 being shown. The sub-array B1 comprises 64 heads, each had being represented by two pole pieces, shows as square dots. 64 word lines (not shown) link the pole pieces, the first word line linking cores 63, 64; the second 61, 62; and the last cores 1, 2. A single bit line links the 64 cores in sub-array B1. The bit line is linked with odd numbered cores in one sense and with even numbered cores in the opposite sense. A pole piece is uniquely selected by energising the appropriate word line and then pulsing the bit line with a positive or negative pulse to select one or other of the two cores conditioned by the word line. The heads in each column are staggered in the x-direction so that when a recording is made by relative movement in the y-direction, the magnetic spot recorded by a head e.g. head 57 is contiguous with the magnetic spot recorded by the next consecutive head in the column. Further the magnetic spot recorded by the first head in each subsequent sub-array is contiguous with the magnetic spot recorded by the last head of the preceding sub-array.