Patent Number: 
Section: claims

1. A beam processing system comprising a disk mounted thereon with a plurality of processing objects on the same circumference, a rotation drive mechanism for rotating said disk about a disk axis, a reciprocating drive mechanism for causing said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and a controller for controlling at least said reciprocating drive mechanism, said beam processing system causing said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects,wherein said beam processing system further comprises a beam width measuring unit for measuring a beam width of said processing beam,said controller sets said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width, andsaid controller, based on the number of rotation of said disk per unit time, a scan speed and the number of reciprocating scan times of said reciprocating scan motion, a reversal start timing of said disk at at least one of said inner overscan position and said outer overscan position, and said measured value of the beam width or said predetermined value of the beam width, controls said reciprocating drive mechanism so as to ensure an overlap region between a last and a current processing beam irradiation region on each of said plurality of processing objects, said overlap region overlapping at least half of said last processing beam irradiation region. 2. The beam processing system according to claim 1, wherein said controller sets said inner overscan position and said outer overscan position depending on said measured value of the beam width and measured values of one end position and the other end position in a scan direction on a cross section of the processing beam. 3. The beam processing system according to claim 1, wherein said controller determines the scan speed and the number of reciprocating scan times of said reciprocating scan motion depending on a required total beam irradiation amount. 4. The beam processing system according to claim 1, wherein said controller ensures said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by regularly delaying per scan the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 5. The beam processing system according to claim 4, further comprising a target detecting unit provided at a position adjacent to said disk for detecting an initial position detection target portion provided at a predetermined position of said disk while said disk is rotating, and outputting a detection signal,wherein said controller delays said reversal start timing based on said detection signal. 6. The beam processing system according to claim 1, wherein said controller ensures said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by delaying per scan the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position by a delay time (T/Nx) derived by dividing a rotation period T of said disk by a value Nx set based on the number of reciprocating scan times N. 7. The beam processing system according to claim 6, further comprising a target detecting unit provided at a position adjacent to said disk for detecting an initial position detection target portion provided at a predetermined position of said disk while said disk is rotating, and outputting a detection signal,wherein said controller delays said reversal start timing based on said detection signal. 8. The beam processing system according to claim 6, wherein when said number of reciprocating scan times N is large, said controller sets said value Nx so as to increase by stages as the number of reciprocating times approaches the number N. 9. The beam processing system according to claim 1, wherein said controller ensures said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by randomly controlling, based on random numbers, the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 10. The beam processing system according to claim 1, wherein said controller ensures said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by controlling the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position, based on a programmed relationship of said number of rotation of said disk, said number of reciprocating scan times, said scan speed, and said measured value of the beam width. 11. The beam processing system according to claim 1, wherein said controller stores a relationship between said number of rotation of said disk and said number of reciprocating scan times as table data in a storage device in advance and ensures said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by controlling, based on said table data, the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 12. A beam processing method that causes a disk mounted thereon with a plurality of processing objects on the same circumference to rotate about a disk axis, causes said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and causes said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects, said beam processing method comprising:measuring a beam width of said processing beam;setting said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width; andbased on the number of rotation of said disk per unit time, a scan speed and the number of reciprocating scan times of said reciprocating scan motion, a reversal start timing of said disk at at least one of said inner overscan position and said outer overscan position, and said measured value of the beam width or said predetermined value of the beam width, controlling said reciprocating scan motion so as to ensure an overlap region between a last and a current processing beam irradiation region on each of said plurality of processing objects, said overlap region overlapping at least half of said last processing beam irradiation region. 13. The beam processing method according to claim 12, comprising setting said inner overscan position and said outer overscan position depending on said measured value of the beam width and measured values of one end position and the other end position in a scan direction on a cross section of the processing beam. 14. The beam processing method according to claim 12, comprising determining the scan speed and the number of reciprocating scan times of said reciprocating scan motion depending on a required total beam irradiation amount. 15. The beam processing method according to claim 12, comprising ensuring said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by regularly delaying per scan the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 16. The beam processing method according to claim 15, comprising using, as a reference for delaying said reversal start timing, a detection signal obtained by detecting an initial position detection target portion provided at a predetermined position of said disk while said disk is rotating. 17. The beam processing method according to claim 12, comprising ensuring said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by delaying per scan the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position by a delay time (T/Nx) derived by dividing a rotation period T of said disk by a value Nx set based on the number of reciprocating scan times N. 18. The beam processing method according to claim 17, comprising using, as a reference for delaying said reversal start timing, a detection signal obtained by detecting an initial position detection target portion provided at a predetermined position of said disk while said disk is rotating. 19. The beam processing method according to claim 17, comprising, when said number of reciprocating scan times N is large, setting said value Nx so as to increase by stages as the number of reciprocating times approaches the number N. 20. The beam processing method according to claim 12, comprising ensuring said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by randomly controlling, based on random numbers, the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 21. The beam processing method according to claim 12, comprising ensuring said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by controlling the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position, based on a programmed relationship of said number of rotation of said disk, said number of reciprocating scan times, said scan speed, and said measured value of the beam width. 22. The beam processing method according to claim 12, comprising preparing a relationship between said number of rotation of said disk and said number of reciprocating scan times as table data in advance and ensuring said overlap region between the last and current processing beam irradiation regions on each of said plurality of processing objects by controlling, based on said table data, the reversal start timing of said disk at said at least one of said inner overscan position and said outer overscan position. 23. A beam processing system comprising a disk mounted thereon with a plurality of processing objects on the same circumference, a rotation drive mechanism for rotating said disk about a disk axis, a reciprocating drive mechanism for causing said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and a controller for controlling at least said reciprocating drive mechanism, said beam processing system causing said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects,wherein said beam processing system further comprises a beam width measuring unit for measuring a beam width of said processing beam,said controller sets said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width, andsaid controller sets a scan speed of said reciprocating scan motion based on selection and setting of the number of rotation of said disk per unit time so that a distance of said reciprocating scan motion during one rotation of said disk becomes smaller than said measured value of the beam width or said predetermined value of the beam width and, after determining the number of reciprocating scan times, sets a reversal start timing of said reciprocating scan motion, thereby controlling said reciprocating drive mechanism so that irradiation of the processing beam is performed onto said plurality of processing objects so as to provide an overlap region overlapping at least half of a last irradiation region of the processing beam on each of said plurality of processing objects. 24. A beam processing method that causes a disk mounted thereon with a plurality of processing objects on the same circumference to rotate about a disk axis, causes said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and causes said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects, said beam processing method comprising:measuring a beam width of said processing beam;setting said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width; andsetting a scan speed of said reciprocating scan motion based on selection and setting of the number of rotation of said disk per unit time so that a distance of said reciprocating scan motion during one rotation of said disk becomes smaller than said measured value of the beam width or said predetermined value of the beam width and, after determining the number of reciprocating scan times, setting a reversal start timing of said reciprocating scan motion, thereby controlling said reciprocating scan motion so that irradiation of the processing beam is performed onto said plurality of processing objects so as to provide an overlap region overlapping at least half of a last irradiation region of the processing beam on each of said plurality of processing objects. 25. A beam processing system comprising a disk mounted thereon with a plurality of processing objects on the same circumference, a rotation drive mechanism for rotating said disk about a disk axis, a reciprocating drive mechanism for causing said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and a controller for controlling at least said reciprocating drive mechanism, said beam processing system causing said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects,wherein said beam processing system further comprises a beam width measuring unit for measuring a beam width of said processing beam,said controller sets said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width, andsaid controller sets a scan speed of said reciprocating scan motion based on selection and setting of the number of rotation of said disk per unit time so that a distance of said reciprocating scan motion during one rotation of said disk becomes greater than said measured value of the beam width or said predetermined value of the beam width and, after selecting the number of reciprocating scan times, sets a reversal start timing of said reciprocating scan motion, thereby controlling said reciprocating drive mechanism so that irradiation of the processing beam is performed onto said plurality of processing objects so as to provide an overlap region overlapping at least half of a last irradiation region of the processing beam on each of said plurality of processing objects. 26. A beam processing method that causes a disk mounted thereon with a plurality of processing objects on the same circumference to rotate about a disk axis, causes said disk, while rotating, to perform a reciprocating scan motion in a direction perpendicular to said disk axis within a stroke range defined by an inner overscan position and an outer overscan position, and causes said plurality of processing objects to pass through an irradiation position of a processing beam by rotation and the reciprocating scan motion of said disk, thereby irradiating the processing beam onto said plurality of processing objects, said beam processing method comprising:measuring a beam width of said processing beam;setting said inner overscan position and said outer overscan position depending on a measured value of said beam width or a predetermined value of said beam width; andsetting a scan speed of said reciprocating scan motion based on selection and setting of the number of rotation of said disk per unit time so that a distance of said reciprocating scan motion during one rotation of said disk becomes greater than said measured value of the beam width or said predetermined value of the beam width and, after selecting the number of reciprocating scan times, setting a reversal start timing of said reciprocating scan motion, thereby controlling said reciprocating scan motion so that irradiation of the processing beam is performed onto said plurality of processing objects so as to provide an overlap region overlapping at least half of a last irradiation region of the processing beam on each of said plurality of processing objects.