LED DRIVING CIRCUIT OF LED PRINTER

PURPOSE:To obtain a drive circuit for setting (N) LEDs to the definite emission quantity of light, by providing a selection circuit for selecting a single duty signal on the basis of a selection signal and inputting the duty signal to a control circuit to set all of LEDs to the definite emission qua...

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Bibliographische Detailangaben
Hauptverfasser:	HIGUCHI FUKUJI, ISHII TAKESHI
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING CORRECTION OF TYPOGRAPHICAL ERRORS COUNTING ELECTRIC COMMUNICATION TECHNIQUE 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
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a drive circuit for setting (N) LEDs to the definite emission quantity of light, by providing a selection circuit for selecting a single duty signal on the basis of a selection signal and inputting the duty signal to a control circuit to set all of LEDs to the definite emission quantity of light. CONSTITUTION:Duty signals different in a duty ratio are outputted from a duty signal output circuit and a single duty signal is selected from the duty signals different in the duty ratio on the basis of the selection signal inputted to a selection circuit. When the single duty signal is inputted to a control circuit, (N) MOS-FETs are brought to a driving or non-driving state by the single duty signal during a period when (N) MOS-FETs must be driven by (N) control signals and the driving times of (N) MOS-FETs are controlled in common. By this method, all of (N) LEDs are set to the definite emission quantity of light to perform printing at definite density.