Patent Number: 
Section: claims

1. An X-ray mask structure detachably mountable in an X-ray exposure apparatus, said X-ray mask structure comprising: an X-ray absorptive material pattern;  a supporting film for supporting the pattern;  a holding frame for holding the supporting film; and  a suction port arranged in said X-ray mask structure, and operable to perform gas drawing from a workpiece side to an opposite side thereto. 2. An X-ray mask structure according to  claim 1 , further comprising a second suction port operable to perform gas drawing at a side of the supporting film remote from the workpiece side. claim 1 3. An X-ray mask structure according to  claim 1 , wherein the suction port is provided in the holding frame. claim 1 4. An X-ray mask structure according to  claim 1 , further comprising a reinforcing member provided on the holding frame. claim 1 5. An X-ray mask structure according to  claim 4 , wherein the suction port is formed in the reinforcing member. claim 4 6. An X-ray mask structure according to  claim 1 , further comprising a pellicle and a pellicle frame for supporting the pellicle. claim 1 7. An X-ray mask structure detachably mountable in an X-ray exposure apparatus, said X-ray mask structure comprising: an X-ray absorptive material pattern;  a supporting film for supporting the pattern;  a holding frame for holding the supporting film;  a suction port arranged in said X-ray mask structure, and arranged to be communicated with external gas drawing means; and  a supply port through which a gas can be supplied. 8. An X-ray mask structure according to  claim 7 , wherein the suction port and the supply port are formed in the holding frame. claim 7 9. An X-ray mask structure according to  claim 7 , further comprising a reinforcing member provided on the holding frame. claim 7 10. An X-ray mask structure according to  claim 9 , wherein the suction port and the supply port are formed in the reinforcing member. claim 9 11. An X-ray exposure apparatus, comprising: a supporting member for supporting an X-ray mask structure; and  a suction port formed in the supporting member and having a function for drawing an exposure ambient gas under a condition that said supporting member supports the X-ray mask structure. 12. An apparatus according to  claim 11 , wherein the suction port is provided in a portion of the supporting member surrounding an X-ray mask structure as held by the supporting member, which portion is at a position other than an upstream position with respect to a gravity direction. claim 11 13. An apparatus according to  claim 11 , further comprising a mask cassette for accommodating an X-ray mask structure, wherein the mask cassette has a suction port formed therein. claim 11 14. An apparatus according to  claim 11 , wherein, when a step-and-repeat exposure process with X-rays is performed to a workpiece by use of an X-ray mask structure as held by the supporting member, the exposure process is executed in an order from a downstream side of the workpiece with respect to the gravity direction. claim 11 15. An X-ray exposure apparatus, comprising: a supporting member for supporting an X-ray mask structure;  a suction port formed in the supporting member and being effective to perform discharging of an exposure ambience gas; and  a supply port formed in the supporting member and having a function for drawing an exposure ambient gas under a condition that said supporting member supports the X-ray mask structure. 16. An apparatus according to  claim 15 , wherein, when the X-ray mask structure is supported by the supporting member, the suction port and the supply port are operable to perform gas discharging and gas supply through a bore formed in the X-ray mask structure. claim 15 17. An apparatus according to  claim 15 , further comprising a mask cassette for accommodating an X-ray mask structure and having a suction port and a supply port formed therein. claim 15 18. An X-ray exposure method, comprising the steps of: holding an X-ray mask structure, wherein X-ray exposure of a workpiece can be performed by using the X-ray mask structure; and  performing exposure ambient gas drawing through a suction port formed in one of the X-ray mask structure and a supporting member for holding the X-ray mask structure, the suction port having a function for drawing an exposure ambient gas under a condition that the X-ray mask is held in said holding step. 19. A method according to  claim 18 , further comprising supplying a gas through a supply port formed in one of the X-ray mask structure or the supporting member for holding the X-ray mask structure. claim 18 20. A method according to  claim 18 , wherein the gas drawing step is executed after X-ray exposure and after separating the X-ray mask structure and a workpiece by a sufficient distance. claim 18 21. A method according to  claim 18 , wherein a chemical amplification type resist is used on a workpiece for X-ray exposure. claim 18 22. A device manufacturing method, comprising the steps of: holding an X-ray mask structure, wherein X-ray exposure of a workpiece can be performed by using the X-ray mask structure;  performing exposure ambient gas drawing through a suction port formed in one of the X-ray mask structure and a supporting member for holding the X-ray mask structure; and  developing the workpiece for which the X-ray exposure has been accomplished by use of the X-ray mask structure, for production of devices. 23. A device produced in accordance with a method as recited in  claim 22 . claim 22 24. An X-ray exposure apparatus, comprising: a supporting member for supporting an X-ray mask structure;  a suction port effective to perform gas drawing; and  a supply port formed in the supporting member and being effective to perform introduction of a gas therethrough containing one of oxygen and ozone, for ozone cleaning with the gas. 25. An apparatus according to  claim 24 , further comprising ultraviolet ray projecting means for irradiating oxygen, introduced through the supply port, with ultraviolet rays to perform ozone cleaning to the X-ray mask structure. claim 24 26. An apparatus according to  claim 25 , wherein the supply port, the suction port and the ultraviolet ray projecting means are disposed adjacent to an exposure position of said exposure apparatus. claim 25 27. An apparatus according to  claim 25 , wherein the supply port, the suction port and the ultraviolet ray projecting means are provided in a mask accommodating member. claim 25 28. An apparatus according to  claim 25 , wherein the supply port, the suction port and the ultraviolet ray projecting means are provided in a separate cleaning unit. claim 25 29. An apparatus according to  claim 25 , wherein the ultraviolet ray projecting means projects ultraviolet rays of a wavelength not greater than 185 nm. claim 25 30. An X-ray exposure apparatus, comprising: a supporting member for supporting an X-ray mask structure;  a suction port effective to perform gas drawing; and  a supply port formed in the supporting member and being effective to perform introduction of a gas therethrough containing at least oxygen, for plasma cleaning of the X-ray mask structure with the gas. 31. An apparatus according to  claim 30 , wherein the supply port and the suction port are provided in a mask accommodating member. claim 30 32. An apparatus according to  claim 30 , wherein the supply port and the suction port are provided in a separate cleaning unit. claim 30 33. An X-ray exposure method, comprising the steps of: performing X-ray exposure with use of an X-ray mask structure; and  introducing one of oxygen and ozone for performing ozone cleaning of the X-ray mask structure. 34. A device manufacturing method, comprising the steps of: performing X-ray exposure of a workpiece with use of an X-ray mask structure, whereby a pattern is transferred to the workpiece:  introducing one of oxygen and ozone for performing ozone cleaning to the X-ray mask structure: and  developing the workpiece having the pattern transferred thereto through the X-ray exposure, for production of devices. 35. An X-ray exposure method, comprising the steps of: performing X-ray exposure by use of an X-ray mask structure: and  introducing oxygen for oxygen plasma cleaning of the X-ray mask structure. 36. A device manufacturing method, comprising the steps of: performing X-ray exposure of a workpiece by use of an X-ray mask structure, whereby a pattern is transferred to the workpiece;  introducing oxygen for oxygen plasma cleaning of the X-ray mask structure; and  developing the workpiece having the pattern transferred thereto, for production of devices.