METHOD AND DEVICE FOR DETECTING EXTRANEOUS SUBSTANCE

PURPOSE:To obtain a method and a device for detecting an extraneous substance which enable easy detection of the place of occurrence of the extraneous substance being a problem in a process of manufacture of a liquid crystal display panel and also enable specification of the kind of the extraneous s...

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Bibliographische Detailangaben
Hauptverfasser:	NAITOU ATSUKATSU, MUNENO RYUICHI, KAMIMURA TSUYOSHI, MATSUDA MASAKI
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a method and a device for detecting an extraneous substance which enable easy detection of the place of occurrence of the extraneous substance being a problem in a process of manufacture of a liquid crystal display panel and also enable specification of the kind of the extraneous substance. CONSTITUTION:A transparent substrate 2 is pressed on a substrate 1 being an object of inspection of an extraneous substance and the extraneous substance is detected. In order to facilitate the detection of the extraneous substance, vacuum packing 3 is applied and each of the substrates 1 and 2 are pressed under the atmospheric pressure. By pressing the two substrates 1 and 2, an interference ring 4 is generated at the position of the extraneous substance. As for a method for pressing, a press can be used. The extraneous substance is held down in a narrow gap and the position of the extraneous substance can be recognized easily with the interference ring 4 under an electric light 5 of a single wavelength component or several wavelength components. By using the interference ring 4 as a recognizing means, a device for detecting the extraneous substance quickly can be constructed.