Deployable inflatable wing

1. A space wing produced by means of a membrane, said membrane forming a polygonal surface provided with an inflatable structure which comprises ribs extending over the membrane along diagonals of the membrane and passing through a central point of the membrane, wherein the inflatable structure comprises at least one film strip, a contour thereof being adhesively bonded to the membrane so as to form an inflatable volume with the membrane and to produce extension ribs of the membrane, wherein the membrane is previously folded during the launching of a satellite or spacecraft and which is deployed once the satellite or spacecraft is in space so as to obtain a large surface.

2. The space wing as claimed in claim 1 , wherein the polygonal membrane is unfolded by means of an inflatable structure comprising at least two film strips, a first strip being adhesively bonded to a first face of the membrane on a first diagonal of the membrane, said first strip and the membrane below said first strip forming a first inflatable tube, and a second strip being adhesively bonded to a second face of the membrane opposing said first face on one or more second diagonals of the membrane, the second strip and the membrane below said second strip forming a second inflatable tube.

3. The space wing as claimed in claim 2 , wherein the membrane is perforated in a center of the polygon surface to place the first and second inflatable tubes in communication with one another.

4. The space wing as claimed in claim 1 , wherein at least one film strip comprises a cut-out adhesively bonded to a face of the membrane on diagonals of the membrane, said at least one flim strip comprising the cross-shaped cut-out and the membrane below said at least on film strip comprising the cross-shaped cut-out forming an inflatable tube.

5. The space wing as claimed in claim 1 , wherein the inflatable structure is produced from a square membrane and comprises two film strips, a first strip being adhesively bonded to a first face of the membrane on a first diagonal of the square membrane, said first strip and the membrane below said first strip forming a first inflatable tube and a second strip being adhesively bonded to a second face of the membrane opposing said first face on a second diagonal of the square membrane, the second strip and the membrane below said second strip forming a second inflatable tube.

6. The space wing as claimed in claim 5 , wherein the square membrane is perforated at a center of the square membrane to place the first and second inflatable tubes in communication with one another.

7. The space wing as claimed in claim 1 , wherein the inflatable structure is produced from a membrane having a square surface and a cross-shaped film strip adhesively bonded to a face of the membrane on the diagonals of the square surface, said cross-shaped film strip and the membrane below said cross-shaped film strip forming an inflatable tube.

8. The space wing as claimed in claim 1 , wherein the inflatable structure comprises an inflating device in a center of the inflatable structure.

9. The space wing as claimed in claim 8 , wherein the inflating device comprises a valve and a tubular end piece perpendicular to the membrane and which is fixed to one of the at least one film strip.

10. The space wing as claimed in claim 9 , wherein the tubular end piece extends a telescopic mast for deployment of the space wing.

11. The space wing as claimed in claim 1 , wherein the space wing is a part of an antenna, a solar panel, an airbrake sail or a solar sail of a spacecraft.

12. A method for folding a space wing as claimed in claim 1 , wherein said method comprises a first series of foldings of the membrane in the manner of a concertina, parallel to a first diagonal of the membrane until a band is produced about said first diagonal, then a second series of foldings of the membrane in the manner of a concertina, perpendicular to said first diagonal until an overlapping surface of sat least one film strip on the membrane is left visible, said overlapping surface bearing an end piece for inflating the inflatable structure.

13. The method for folding a space wing as claimed in claim 12 , wherein the first series of foldings is carried out parallel to the first diagonal, said method starts by folding a first wing of the membrane in the manner of a concertina on a first side of said first diagonal by means of foldings which fold said first wing on a band having a width of a strip about said first diagonal and the method is terminated by folding a second wing in the manner of a concertina on the other side of the first diagonal by means of foldings which fold the second wing on the first folded wing.

14. The method for folding a space wing as claimed in claim 13 , wherein the first series of foldings is carried out parallel to an axis of the first diagonal and the first wing and the second wings are folded together in the manner of a concertina.

15. The method for folding a space wing as claimed in claim 12 , wherein as one increment corresponds to a width of a strip arranged on the first diagonal, the first series of foldings comprises the folding of a first wing along the folds in the manner of a concertina parallel to the first diagonal on a band having a width of half an increment on a first side of the first diagonal, the first series of foldings comprising the folding of a second wing along the folds in the manner of a concertina on a band having a width of half an increment on a second side of the first diagonal so that the first wing and the second wings are folded side-by-side.

16. The method for folding a space wing as claimed in claim 12 , wherein the second series of foldings is carried out perpendicular to the first diagonal, arms of the band on either side of a second diagonal being folded together in the manner of a concertina.

17. The method for folding a space wing as claimed in claim 12 , wherein the second series of foldings is carried out parallel to a second diagonal and comprises the folding of a first arm along the folds in the manner of a concertina and then the folding of a second arm along the folds on the first arm in the manner of a concertina.

18. The method for folding a space wing as claimed in claim 12 , wherein the second series of foldings comprises a separate folding in parallel with arms, on either side of the first diagonal along the folds in the manner of a concertina.