Patent Number: 052272680
Section: claims

1. An X-ray mask comprising: an X-ray permeable film, having a first main surface and a second main surface opposite to said first main surface, supported by a supporting frame formed of silicon;  an LSI circuit pattern and a first alignment pattern formed on the first main surface of said X-ray permeable film; and  a second alignment pattern, substantially identical to said first alignment pattern, formed on the second main surface of said X-ray permeable film at a position corresponding to said first alignment pattern.  coating a photosensitive material over the second main surface of an X-ray permeable film being installed on a supporting frame and having a first LSI circuit pattern and a first alignment pattern formed on the first main surface; and  forming a second alignment pattern opposite to said first main surface and self-adjustingly on the second main surface of said X-ray permeable film through an exposure of said photosensitive material from the first main surface of said X-ray permeable film with the first alignment pattern, which was formed on said first main surface, used as a mask and then a development of said photosensitive material.  coating a photosensitive material over the second main surface of an X-ray permeable film being installed on a supporting frame and having a first LSI circuit pattern and a first alignment pattern formed on the first main surface;  forming a second LSI pattern and a second alignment pattern opposite to said first main surface and self-adjustingly on the second main surface of said X-ray permeable film through an exposure of said photosensitive material from the first main surface with the LSI circuit pattern and the first alignment pattern, which was formed on the first main surface, used as a mask and then a development of said photosensitive material; and  eliminating selectively the second LSI circuit pattern formed on the second main surface of said X-ray permeable film.  disposing an X-ray mask, which has an X-ray permeable film with an LSI circuit pattern and a first alignment pattern formed on a first main surface and also with a second alignment pattern formed on a second main surface opposite to said first main surface at a position corresponding to that of said first alignment pattern, close to a wafer surface with the first main surface of said X-ray permeable film facing said wafer surface; and  irradiating the second main surface of said X-ray permeable film with X-rays after an alignment has been performed at least through the use of diffracted lights emitted from the second alignment pattern formed on the second main surface of said X-ray permeable film upon irradiating the second main surface of said X-ray permeable film with laser beam. 2. A fabricating method of an X-ray mask having a first main surface and a second main surface comprising the steps of: 3. A fabricating method of an X-ray mask having a first main surface and a second main surface comprising the steps of: 4. An exposure method comprising the steps of: