公开(公告)号：FR2410850A1

公开(公告)日：1979-06-29

申请号：FR7830415

申请日：1978-10-19

Applicant: IBM

Inventor： BURKE MICHAEL J ,  SIVERLING MICHAEL M ,  WILFINGER RAYMOND J

IPC: G06K9/38 ,  H04N1/407 ,  G06G9/00

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：CA1177880A

公开(公告)日：1984-11-13

申请号：CA362741

申请日：1980-10-20

Applicant: IBM

Inventor： BURKE MICHAEL J ,  COLLINS DAVID W

IPC: H02K29/00 ,  H02P6/12 ,  H02P7/28

Abstract: BIFILAR BRUSHLESS DC MOTOR A brushless D. C. motor is disclosed having two bifilar winding wire pairs with each bifilar pair forming alternate windings. Each winding is switched by a transistor which has a back poled diode connected in parallel therewith. The 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. RO978-046