Glass manufacturing – Processes – Sequentially forming – reheating – and working
Patent
1996-11-04
1999-03-16
Griffin, Steven P.
Glass manufacturing
Processes
Sequentially forming, reheating, and working
65108, 65DIG8, 264291, 72368, 7237025, C03B 2304, B29C 5500
Patent
active
058823697
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to capillary tubes and methods for producing at least one capillary inside a workpiece of a mouldable material, such as glass, plastic, quartz, silicon, metal or the like, and which capillary has a big length in relationship to its cross section, comprising the steps of creating or producing a closed cavity within the workpiece, and stretching the material in at least one direction so much that the cavity forms a substantially elliptical or parabolic capillary having said length to width relationship.
BACKGROUND OF THE INVENTION
Capillary tubes whose inner surface has total reflecting properties with regard to electromagnetic radiation and whose longitudinal section is substantially elliptical/part elliptical or parabolic/part parabolic, can be used for focusing and or concentration of X-ray radiation beams, so that these are concentrated to a small area with high intensity.
However, a very high surface quality is required on the inside of the capillary tube, to enable for the X-ray radiation beam to pass by means of reflection from one opening at one end of the ellipsoid to an opening at the opposite end of the ellipsoid. It has also been shown that there should be a relationship in the magnitude of 1:1000 between both axes of the ellipsoid, to achieve an advantageous focusing of the X-ray radiation beam.
TECHNICAL PROBLEM
One purpose with the present invention is therefore to provide a production method for capillary tubes for this purpose.
SUMMARY OF THE INVENTION
For this purpose, the method according to invention is characterized in the additional step of heating the workpiece before stretching, so much at least right in front of the cavity that the cavity is expanded and shaped into an essentially spherical form.
The apparatus for focusing X-ray radiation and the like by means of a beam concentrator one end of which is connected to a source of radiation, is characterized in that the beam concentrator consists of at least one, in a workpiece of a mouldable material, such as glass, plastic, quartz, silicon, metal or the like, arranged capillary having a very small cross section in relationship to its length, that the capillary is formed by at least one cavity within the workpiece, by means of a closed or semiclosed cavity, that the workpiece with the included cavity is shaped by stretching in one direction under transformation of the cavity into said capillary, with a decreasing cross section at least in one of its ends, preferably with part elliptic or part parabolic shape as seen in the longitudinal direction of the capillary, and that one or both pointed ends of the capillary is cut off to form a passage/passages for the beam.
DESCRIPTION OF DRAWINGS
The invention will be described here below with reference to embodiments which are shown in the enclosed drawings, in which
FIGS. 1 and 2 schematically discloses a first variant for providing a workpiece for producing capillary tubes according to the invention,
FIG. 3 discloses a second variant for producing a workpiece for production of capillary tubes according to the invention, and
FIGS. 4 and 5 discloses such a workpiece, respectively before and after extension to a capillary tube.
DESCRIPTION OF EMBODIMENTS
FIG. 1 discloses three cylindric glass bodies 10, 11 and 12, of which the left constitutes of a glass tube with a longitudinal hole 13. The other two glass bodies 11, 12 are provided with in each of its ends made depressions 14. By heating, it is possible to melt together the ends of the three glass bodies, resulting in the fused glass body 15 shown in FIG. 2, which includes a blind tube channel 16 with arbitrary length, an ellipsoid cavity 17 and a depression 14. The hole 13 and the depressions 14 can for example be provided by casting the bodies 10-12 in mould.
Consequently, FIGS. 1 and 2 discloses a possible method to provide gas bubbles in a glass body. By heating the glass body 15, the tube channel 16 can be made to collapse at suitable places, so that a series of cavities
REFERENCES:
patent: 3183721 (1965-05-01), Kaynan
patent: 4726829 (1988-02-01), Gac et al.
patent: 4848998 (1989-07-01), Snitzer et al.
patent: 4917718 (1990-04-01), Berkey
patent: 5001737 (1991-03-01), Lewis et al.
Engstrom Per
Larsson Sture
Rindby Anders
Stocklassa Bengt
Griffin Steven P.
X-Ray Capillary Optics I Goteborg AB
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