Patent Number: 048333344
Section: claims

1. A protective box for electronic circuits hardened with respect to x-rays, said protective box comprising a molded rigid mechanical structure of composite material constituted by a fiber-reinforced resin; an x-ray protection material covering at least parts of said mechanical structure capable of being irradiated by x-rays, said x-ray protection material being potted on said mechanical structure and composed of a resin matrix containing a regularly dispersed powder consisting of at least one metal and/or at least one inorganic compound of a metal, said powder having a melting temperature at least equal to 630.degree. C., said metal and/or metal of the inorganic compound having a high atomic number at least equal to 47; and  an anti-SGEMP material which at least partly covers the outer and/or inner surface of the mechanical structure. 2. A protective box according to claim 1, wherein the powder represents 25 to 50% by volume of the x-ray protection material. 3. A protective box according to claim 1, wherein the high atomic number metal is selected from the group consisting of silver, tantalum, tungsten and uranium. 4. A protective box according to claim 1, wherein the anti-SGEMP material includes at least one chemical element with a low atomic number at the most equal to 6. 5. A protective box according to claim 4, wherein the low atomic number element is selected from a group consisting of carbon, boron and beryllium. 6. A protective box according to claim 1, including an electrically conducive material covering the outer surface of the assembly composed of the mechanical structure and the x-ray protection material. 7. A protective box according to claim 1, including a material which is electrically conducive covering the inner surface of the mechanical structure. 8. A protective box according to claim 7, wherein the electricity conducting material is selected from the group consisting of silver, aluminum, beryllium and copper. 9. A protective box according to claim 1, wherein the mechanical structure is provided on its surface covered with the x-ray protection material with slots for improving the adhesion of said material to the mechanical structure. 10. A protective box according to claim 1, wherein the composite material constituting the mechanical structure is formed from a thermosetting resin. 11. A protective box according to claim 1, wherein said anti-SGEMP material has a thickness exceeding the free middle path of electrons emitted during an x-ray irradiation of said box.