Recycling of large-size photomask substrate

A used large-size photomask substrate having a patterned light-shielding film is recycled by (i) removing the light-shielding film from the used substrate to provide a photomask-forming glass substrate stock, (ii) resurfacing the glass substrate stock by sand blasting, (iii) repolishing the resurfac...

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Bibliographische Detailangaben
Hauptverfasser:	UEDA, SHUHEI, SHIBANO, YUKIO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY CINEMATOGRAPHY ELECTROGRAPHY GLASS HOLOGRAPHY JOINING GLASS TO GLASS OR OTHER MATERIALS MATERIALS THEREFOR METALLURGY MINERAL OR SLAG WOOL ORIGINALS THEREFOR PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	A used large-size photomask substrate having a patterned light-shielding film is recycled by (i) removing the light-shielding film from the used substrate to provide a photomask-forming glass substrate stock, (ii) resurfacing the glass substrate stock by sand blasting, (iii) repolishing the resurfaced glass substrate stock to yield a regenerated glass substrate stock, (iv) applying a light-shielding film onto the regenerated glass substrate stock to yield a regenerated photomask-forming blank, and (v) processing the light-shielding film of the blank into a pattern corresponding to the desired exposure of a mother glass, yielding a regenerated photomask substrate.