公开(公告)号：DE2846624A1

公开(公告)日：1979-05-31

申请号：DE2846624

申请日：1978-10-26

Applicant: IBM

Inventor： BURKE MICHAEL JOSEPH ,  SIVERLING MICHAEL MCHUGH ,  ROCHESTER MINN ,  WILFINGER RAYMOND JOHN

IPC: G06K9/38 ,  H04N1/407 ,  G06K9/02 ,  H04N1/40

Abstract: Analog voltage levels derived from optically scanning a document or from magnetically scanning a magnetic record, depend upon the variable amplitude of a background signal. The analog voltage levels are processed by a bucket brigade circuit to set a threshold from which a binary decision may be made as to the presence of a black or white indicium in optical recognition or a one (1) or zero (0) bit in magnetic reading.

公开(公告)号：DE3069603D1

公开(公告)日：1984-12-13

申请号：DE3069603

申请日：1980-11-14

Applicant: IBM

Inventor： BURKE MICHAEL JOSEPH ,  COLLINS DAVID WHINERY

IPC: H02K29/00 ,  H02P6/12 ,  H02P6/02 ,  H02K29/02

Abstract: A brushless D. C. motor is disclosed having two bifilar winding wire pairs (P1, P3 and P2, P4) with each bifilar pair forming alternate windings. Each winding (P1 to P4) is switched by a transistor (T1-T4) which has a back poled diode (45) connected in parallel therewith. A control circuit sequences energization of single windings with each winding energized being in a different bifilar pair than the next preceding energized winding whereby when a transistor is switched off the other winding of the bifilar pair and the associated back poled diode protect the transistor and provide an energy conserving/heat eliminating path for the induced current. Each winding is further formed of a pair of subwindings having an angle of separation therebetween approximately half the angular separation between adjacent windings.