公开(公告)号：GB975979A

公开(公告)日：1964-11-25

申请号：GB1959162

申请日：1962-05-22

Applicant: IBM WORLD TRADE LAB GREAT BRIT

Inventor： MEGGITT JOHN EDWARD ,  HERBERT JOHN RICHARD ,  SHARP JOHN JOSHUA

IPC: G11B5/52 ,  G11B19/20

Abstract: 975,979. Disc record data storage apparatus. IBM WORLD TRADE LABORATORIES (GREAT BRITAIN) Ltd. Jan. 10, 1963 [May 22, 1962], No. 19591/62. Heading G5R. Arcuate tracks 64 Fig. 3 on a magnetic disc 12 are scanned by rotating the disc and a head 60 about axes 16, 44 respectively the head being maintained in constant orientation with its track on the axis 62 by gears 52, 54, 56 in the inverse direction to the relative rotation of transducer and disc along the track. The head is only operational for 120 degrees of each successive track circuit to avoid overlapping, and improved track packing-density may be achieved near the centre of the disc, Fig. 4 by varying the start of the operational sector. In an alternative embodiment, Fig. 5, the head is aligned, not by rotation about the axis 62 (Fig. 1) but by a parallel-linkage movement. The precession of the tracks by incremental rotation of a gear coupled to a differential 26, or by a stepping motor included between 24 and 38, is claimed in Specification 975,978. Multiple head-driving arrangements may be used. A single head may be precessed by making the drive ratios for head and disc slightly different from unity.

公开(公告)号：GB975978A

公开(公告)日：1964-11-25

申请号：GB1959062

申请日：1962-05-22

Applicant: IBM WORLD TRADE LAB GREAT BRIT

Inventor： MEGGITT JOHN EDWARD ,  HERBERT JOHN RICHARD ,  SHARP JOHN JOSHUA

IPC: G11B5/52 ,  G11B19/20

Abstract: 975,978. Disc record data storage apparatus. IBM WORLD TRADE LABORATORIES (GREAT BRITAIN) Ltd. Jan. 10, 1963 [May 22, 1962], No. 19590/62. Heading G5R The description of Figs. 1-5 is the same as in Specification 975, 979, but the claims are directed to the means for incrementally processing successive tracks. The description extends to multi-head embodiments providing continuous recording:- Fig. 6 requires slip-rings for the heads, but only one drive means for the heads; Figs. 7 and 8 require three drive means but no slip rings since the partial tracks do not overlap. Fig. 9 is equivalent to the single-head embodiment in Fig. 5 (not shown, but see Specification 975,979). Stacked assemblies of discs with relevant heads and common drive means may be used, particularly where the information on the discs is related in decade manner. The heads are preferably of the type supported over the discs by Bernonilli effect.