公开(公告)号：US3588380A

公开(公告)日：1971-06-28

申请号：US3588380D

申请日：1969-03-21

Applicant: IBM

Inventor： HORLANDER FRANK J ,  YOUNT WILLIAM R

IPC: G09B5/06 ,  G11B5/02 ,  G11B5/86 ,  G11B25/04 ,  G11B5/44

CPC classification number: G11B25/04 ,  G09B5/062 ,  G11B5/02 ,  G11B5/865

Abstract: EDUCATIONAL APPARATUS IN THE FORM OF A RECORDING/REPRODUCING UNIT ACCOMMODATES A RECORD MEDIA COMPARABLE IN SIZE TO THE FAMILAR IBM TABULATION CARD. THE MEDIA HAS PRINTED INFORMATION ON ONE SIDE SUCH AS QUESTIONS AND ANSWERS, CIRCUIT DIAGRAMS, ETC. THAT IS VISIBLE TO THE USER WHEN IN OPERATING POSITION AND RECORDED INFORMATION ON THE OPPOSITE SIDE POSITIONED FOR SCANNING BY A TRANSDUCER DURING PLAYBACK AND RECORD MODES. ONE FEATURE OF THE MACHINE IS TO RECORD AND PLAYBACK SPEECH WHILE USING TWO DISTINCTLY DIFFERENT MAGNETIC RECORDING MATERIALS. THE FIRST MATERIAL (MASTER CARD) REPRESENTS THAT USED FOR THE DIRECT RECORDING OF MASTER RECORDS. IT IS OF HIGH COERCIVITY AND HIGH RETENTIVITY. THE SECOND MASTER (COPY CARD) HAS RELATIVELY LOWER MAG-

NETIC PROPERTIES. IN ORDER TO RECORD AND REPRODUCE WITH THE TWO DIFFERENT MATERIALS ON A COMMON RECORD/PLAYBACK MACHINE, THE CIRCUITS CONTROLLING THE HIGH FREQUENCY BIAS AND SIGNAL RECORDING CURRENTS ARE CHANGED DEPENDING IN THE TYPE OF MATERIAL USED. THIS IS ACCOMPLISHED BY ELECTRICAL SWITCHING OF EITHER OF TWO EQUALIZATION AS BIAS AND PREEMPHASIS NETWORKS IN THE RECORD CIRCUITS RELATED TO THE MASTER AND COPY MEDIA WHICH OCCURS AUTOMATICALLY WHENEVER THE RESPECTIVE MEDIA IS INSERTED. THE MASTER MEDIA IS INTENTIONALLY OVERRECORDED TO COMPENSATE FOR NOMINAL AND EXTREME SIGNAL LOSSES EXPECTED TO BE ENCOUNTERED WHEN THE MASTER MEDIA IS USED AS A SOURCE DURING A LATER MAGNETIC TRANSFER OPERATION.

公开(公告)号：CA1186943A

公开(公告)日：1985-05-14

申请号：CA440728

申请日：1983-11-08

Applicant: IBM

Inventor： HORLANDER FRANK J

IPC: B41J2/36 ,  B41J2/325 ,  B41J2/355 ,  G06K15/10 ,  H03K17/62 ,  H04N1/23 ,  B41J3/20

Abstract: THERMAL PRINTER EDGE COMPENSATION A current-drive circuit (Fig. 1) is provided to drive each of forty electrodes 41. When selected, the circuit forces line 27 to a level of drive voltage Vdr minus a current-level reference voltage Vlev. A constant current is produced across resistor 25. Line 27 is connected through resistor 29a to line 27a, which is the same point in the current-drive circuit of the adjoining electrode 41a (Fig. 3) on one side of electrode 41. Line 27 is similarly connected through resistor 29b to line 27b, which is the same point in the current-drive circuit of the adjoining electrode 41b (Fig. 3) on the opposite side of electrode 41. Selection of the drive circuit also connects line 27 to the associated electrode 41. An unselected drive circuit for an adjoining electrode, such as the one connected to drive electrode 41a, has line 27a floating to the level dictated by Vdr through its resistor 25a, while its electrode 41 is disconnected. Current from the unselected circuit through resistor 29a adds to the current in electrode 41, thereby eliminating lightened-edge printing from current spreading.

公开(公告)号：CA1223149A

公开(公告)日：1987-06-23

申请号：CA473700

申请日：1985-02-06

Applicant: IBM

Inventor： HORLANDER FRANK J

IPC: B41J2/32 ,  B41J2/325 ,  B41J2/355 ,  B41J2/37 ,  B41J3/20

Abstract: REGULATED VOLTAGE AND APPROXIMATE CONSTANT POWER FOR THERMAL PRINTHEAD of the Invention Electrodes 1a through 1n are driven by operational amplifier 4 under control of a reference current source 25. The voltage at each electrode 1a through 1n is monitored by diodes 19a through 19n so that point 21 is set at that of the lowest electrode voltage. A current source provides equal currents through diode 23 and the conducting one of diodes 19a through 19n. The potential of control input 5 is therefore that of the lowest potential of all of electrodes 19a through 19n. Feedback through resistor 27 produces a differential amplifier system in which V2 is set by source 25. The output of amplifier 4 and the magnitude of resistors 15a through 15n are selected so that the nominal voltage on line 13 is reduced by one-half across the resistor 15a through 15n. This approximates constant power to ribbon 2. The voltage regulation and constant power each act to limit power dissipation at the ribbon surface. This reduces debris at the printhead.

公开(公告)号：CA1222411A

公开(公告)日：1987-06-02

申请号：CA462551

申请日：1984-09-06

Applicant: IBM

Inventor： BARTLETT JOHN C ,  BOHNHOFF ALAN E ,  CROLEY DONALD F ,  DYER STANLEY ,  EDDS KENNETH E ,  HORLANDER FRANK J ,  STAFFORD DONALD W

IPC: B41J2/325 ,  B41J29/36 ,  B41J29/373 ,  B41M5/26

Abstract: DRIVE FOR THERMAL PRINTING LIFT-OFF CORRECTION Ribbon (22) in thermal printing has an outer layer which adheres to printed characters at intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Lift-off is accomplished by the pattern control (40) controlling the current source (38) to provide rapid, square wave pulses displaced in phase 180 degrees at adjoining electrodes (9). The high level of the pulses is about that of the level at printing, and the pulses are sufficiently rapid so that their net effect is to raise the outer layer ribbon (22) to the intermediate temperature. At areas corresponding to underlines of characters, duration of the up period is longer. Good, long term reliability is achieved by the significant erase level being very close to the print level.

公开(公告)号：CA1212583A

公开(公告)日：1986-10-14

申请号：CA481784

申请日：1985-05-17

Applicant: IBM

Inventor： HORLANDER FRANK J

IPC: B41J2/32 ,  B41J2/335 ,  B41J2/425 ,  G01D15/10 ,  B41J3/20

Abstract: VOLTAGE MODE PRINTHEAD DRIVE WITH SENSING AT THE PRINTHEAD of the Invention A voltage mode printhead drive for a resistive ribbon 20 employs sensing electrodes 7a contiguous to drive electrodes 1a through 1n. Electrodes 7a sense the return voltage, Vc, from the drive electrodes to ground. Electrodes 7a are mounted in and are a part of the printhead.