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Title: Vacuum-tight windows for passage of X-rays or similar penetrating radiation
Claims: What is claimed is: 1. A vacuum-tight window construction for the passage of x-ray and similar penetrating radiation, said construction comprising an annular frame having a tubular edge portion, a cap-shaped window transparent to penetrating radiation having an annular flange with radially inner and outer surfaces, and a ring, said ring, said annular flange and tubular edge portion being juxtaposed with one another and press-fit together to form an integral assembly, the outermost of the juxtaposed elements having a coefficient of thermal expansion which is less than that of the annular flange of the cap-shaped window which forms the middle juxtaposed element, the innermost of the juxtaposed elements having a coefficient of thermal expansion which is at least equal to that of the outermost element but less that that of the middle element, the innermost of the juxtaposed elements having an outer surface mating with the inner surface of the annular flange, the outermost element having an inner surface mating with the outer surface of the annular flange and encircling the annular flange of said window, the innermost element being encircled by both the outermost element and the annular flange of the window, and the elements being formed with sufficiently close tolerances and being forced together with sufficient pressure therebetween at the mating surfaces thereof to provide a tight press-fit relationship in the absence of any additional securing means. 2. A construction as claimed in claim 1 wherein said innermost and outermost elements are composed of steel and the middle element is pure or alloy aluminum. 3. A construction as claimed in claim 1 wherein the innermost element is the tubular edge portion of the frame, said annular flange of the window being the middle element, and said ring being the outermost element. 4. A construction as claimed in claim 3 wherein the innermost element has an outer conical surface and the outermost element has an inner conical surface. 5. A construction as claimed in claim 2 wherein at least one of the steel elements has a circumferential bead which penetrates into the aluminum element. 6. A construction as claimed in claim 5 wherein said bead has a triangular cross-section pointing outwardly. 7. A construction as claimed in claim 1 with the annular flange being of sheet material having an axial extent of at least two to three centimeters in overlapping relation to the tubular edge portion of said frame, and said annular flange having a vacuum-tight seal to said tubular edge portion of said frame solely by the press fit relationship of the engaging surfaces thereof. 8. A construction as claimed in claim 7 with the window including said annular flange being of sheet material having a thickness of about one millimeter. 9. A construction as claimed in claim 8 with the window providing an inlet aperture for penetrating radiation of at least about 30 centimeters in diameter and the sheet material of the window having a thickness of about one millimeter. Other info: Inventors: Kotschak, Otto (Erlangen-Buckenhof, DE, US) Frank, Richard (Erlangen, DE, US) Application Number: 669725 Filing Date: 1976-03-23 Publication_date: 1978-10-10 Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE) Primary Class(es): 220/2.1R 313/420, 378/140, 378/161 Other Classes: US Patent Ref:
Other Refs:
Primary Examiner: Marcus, Stephen Assistant Examiner: Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson |
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