Patent Number: 062122525
Section: claims

1. An X-ray mask comprising: a substrate;  a membrane formed on said substrate and allowing passage of X-rays; and  an X-ray absorber formed on said membrane and intercepting transmission of X-rays, wherein  a protective film arranged between said substrate and said X-ray absorber.  forming a membrane allowing passage of X-rays on a substrate;  forming an X-ray absorber intercepting transmission of X-rays on said membrane;  forming a window exposing said membrane in said substrate;  forming a first mask layer on said X-ray absorber;  writing a first mask pattern on said first mask layer;  effecting development on said first mask layer to form a first mask pattern layer;  removing said X-ray absorber using said first mask pattern layer as a mask, and thereby forming an opening functioning as an alignment mark in a region not overlapping with said opening in a plan view.  removing said first mask pattern layer;  forming a second mask layer on said X-ray absorber;  writing a second mask pattern on said second mask layer while performing position detection of said second mask layer using said opening as the alignment mark;  effecting development on said second mask layer to form a second mask pattern layer; and  removing said X-ray absorber to form a transfer circuit pattern, using said second mask pattern layer as a mask.  said step of writing said first mask pattern includes an exposure step using light, and  said step of writing said second mask pattern includes a writing step using an electron beam.  said step of forming said second mask layer includes a step of forming a second mask layer exposing said opening on said X-ray absorber.  said step of forming said opening include a first etching step of removing said X-ray absorber,  said step of forming said transfer circuit pattern includes a second etching step of removing said X-ray absorber, and  said first and second etching steps are performed under different conditions, respectively.  writing a second mask pattern on said first mask layer while performing position detection of said first mask layer using said opening as an alignment mark;  forming a second mask pattern layer by effecting development on said first mask layer; and  forming a transfer circuit pattern by removing said X-ray absorber, using said second mask pattern layer as a mask.  said step of writing said first mask pattern includes an exposure step using light, and  said step of writing said second mask pattern includes a writing step using an electron beam.  said step of forming said opening includes a first etching step of removing said X-ray absorber,  said step of forming said transfer circuit pattern includes a second etching step of removing said X-ray absorber, and  said first and second etching steps are performed under different conditions, respectively. 2. The X-ray mask according to claim 1, wherein said alignment mark is an opening formed in said X-ray absorber. 3. The X-ray mask according to claim 1, further comprising: 4. A method of manufacturing an X-ray mask, comprising the steps of: 5. The method of manufacturing the X-ray mask according to claim 4, further comprising the steps of: 6. The method of manufacturing the X-ray mask according to claim 5, wherein 7. The method of manufacturing the X-ray mask according to claim 5, wherein 8. The method of manufacturing the X-ray mask according to claim 5, wherein 9. The method of manufacturing the X-ray mask according to claim 4, further comprising: 10. The method of manufacturing the X-ray mask according to claim 9, wherein 11. The method of manufacturing the X-ray mask according to claim 9, wherein