LASER PRINTING DEVICE

PURPOSE:To prevent the burning of a condensing lens and to elongate its life, by providing a screening plate, which screens the laser light beam reflected by a metal mask plate, between the condensing lens and the metal mask plate. CONSTITUTION:In the laser printing device, the screening plate 6 is...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MOTOMURA SHIYOUJI, URASAKI NAOHIKO, MISHIMA MASATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING COLOUR PRINTING CORRECTION OF TYPOGRAPHICAL ERRORS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SELECTIVE PRINTING MECHANISMS SOLDERING OR UNSOLDERING STAMPS TRANSPORTING TYPEWRITERS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the burning of a condensing lens and to elongate its life, by providing a screening plate, which screens the laser light beam reflected by a metal mask plate, between the condensing lens and the metal mask plate. CONSTITUTION:In the laser printing device, the screening plate 6 is provided between the condensing lens 1 and the metal mask 4. A through hole 7 is provided in said screening plate 6, and the laser light beam 2 is converged in the inside of said through hole 7. Therefore, the most of the reflected laser light 2' from the metal mask plate 4 is screened by the screening plate 6 and does not reach the condensing lens 1. Therefore, the burning of the condensing lens due to the reflected laser light 2' as experienced in a conventional method can be prevented. As another method, the metal mask plate 4 can be provided so that it is inclined with respect to the optical axis of the laser light beam, not in perpendicular to the optical axis.