Device and Method of Controlling Negative Pressure, and Ink-jet Printing Apparatus Having the Same

PURPOSE: An apparatus and method for controlling sound pressure and an ink-jet printing apparatus including the same are provided to finely control the sound pressure applied to an object and the discharge pressure of the object by using an ejector which changes large supply pressure into the minute...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	CHOI, WOO HYUK, NAM, GUNG KEE
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	PURPOSE: An apparatus and method for controlling sound pressure and an ink-jet printing apparatus including the same are provided to finely control the sound pressure applied to an object and the discharge pressure of the object by using an ejector which changes large supply pressure into the minute intensity of the sound pressure. CONSTITUTION: An apparatus for controlling sound pressure comprises a pump(272), a regulator(274), an ejector(277), and a sound pressure sensor(278). The pump generates positive pressure. The regulator is connected to the pump. The regulator controls the positive pressure generated from the pump. The ejector includes an input unit(277a) connected to the regulator The ejector generates sound pressure through an output unit(277b) when the positive pressure is inputted through the input unit. The sound pressure sensor is offered between the output unit and an object(220) and senses and measures the sound pressure.