PRINTER

• Main Authors: OSAWA MICHINAO, IINUMA AKIKO
• Format: Patent
• Language: English
• Published: 29.08.1988
• Subjects: CALCULATING; COMPUTING; CORRECTION OF TYPOGRAPHICAL ERRORS; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; HANDLING RECORD CARRIERS; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRESENTATION OF DATA; PRINTING; RECOGNITION OF DATA; RECORD CARRIERS; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

PURPOSE:To keep a processing speed low and to raise a dynamic range of a printer printing surface, by a method wherein upper and lower thresholds for a binarizing A/D converter are used as variable reference voltages, and the reference voltages are varied through D/A converters just before starting printing with a printer and, thereby, the reference voltages are so determined that a binarizing output level reaches to a proper level for the printer printing. CONSTITUTION:According to the value of a threshold code generation part 21, a direction is imparted to a binarizing output counting part 22, and the value is preset to determine the number to be counted. After that, by a counter in a threshold decision part 23 a lower threshold is set at the minimum, and an upper threshold is set at the maximum, and upper and lower reference voltages for an A/D converter 26 are imparted through D/A converters 24, 25. With a direction of a printer printing, an internal CPU etc. receives the direction to start pre-sampling the data value. Namely, with the direction imparted from the CPU etc. to a control part 28, the A/D converter 26 conducts a sampling, and the sampled data is fed into the binarizing output counting part 22.