Method for producing a plastic membrane device and the thus obtained device

1. A membrane device in the form of an optical lens comprising a substrate, a liquid deposited on said substrate, and a first homogenous continuous thin film covering said liquid and at least one substrate portion bearing said liquid, wherein said liquid and substrate portion are covered by said film by means of a low-pressure deposition process, said film being made of polyparaxylylene or parylene and forming a membrane fitting the contours of the substrate-liquid assembly, and wherein said liquid has a saturation vapor pressure lower than the deposit pressure and is chemically non-reactive with said polyparaxylylene or parylene, said optical lens having a focal distance determined by materials which are used.

2. The membrane device according to claim 1 , wherein said liquid has a surface tension chosen in such a way that the liquid forms a specific angle with the substrate.

3. The membrane device according to claim 1 , wherein it further comprises a heater lodged under said liquid for producing an increase in the temperature of the liquid, which expands for modifying the geometry of the lens.

4. The membrane device according to claim 1 , wherein said substrate comprises a cavity in which said liquid is deposited.

5. The membrane device according to claim 4 , wherein said cavity passes through said substrate from one surface to another surface, and wherein said film is deposited on both of said surfaces of the substrate.

6. The membrane device according to claim 1 , wherein said substrate is made of a second homogenous continuous thin film made of polyparaxylylene or parylene deposited by means of a low-pressure deposition process.

7. The membrane device according to claim 1 , wherein said liquid is an oil.

8. The membrane device according to claim 1 , wherein said substrate comprises an oleophobic material.

9. A method for producing a membrane device in the form of an optical lens according to claim 1 , said method comprising:

providing a substrate,

depositing a liquid on said substrate, and

covering said liquid and at least one substrate portion bearing said liquid with a first homogenous continuous thin film by means of a low-pressure deposition process,

said film being made of polyparaxylylene or parylene and forming a membrane fitting the contours of the substrate-liquid assembly,

said liquid having a saturation vapor pressure lower than the deposit pressure and being chemically non-reactive with said polyparaxylylene or parylene,

and said optical lens having a focal distance determined by materials which are used.

10. The method according to claim 9 , wherein said liquid has a surface tension chosen in such a way that the liquid forms a specific angle with the substrate.

11. The method according to claim 9 , wherein said substrate comprises a cavity in which said liquid is deposited.

12. The method according to claim 1 , wherein said cavity passes through said substrate from one surface to another surface, and wherein said film is deposited on both of said surfaces of the substrate.

13. The method according to claim 9 , wherein said substrate is made of a second homogenous continuous thin film made of polyparaxylylene or parylene deposited by means of a low-pressure deposition process.

14. The method according to claim 9 , wherein said liquid is an oil.

15. The method according to claim 9 , wherein said substrate comprises an oleophobic material.

16. A membrane device in the form of a piezoelectric actuator comprising a substrate, a liquid deposited in a channel of said substrate, and a layer of a piezoelectric material deposited at the bottom of said channel and made accessible so as to connect it to an electrode, wherein a homogenous continuous thin film covers said liquid and at least one substrate portion bearing said liquid, wherein said film is of a polyparaxylylene or parylene made by means of a low-pressure deposition process and forms a membrane fitting the contours of the substrate-liquid assembly, and wherein said liquid has a saturation vapor pressure lower than the deposit pressure and is chemically non-reactive with said polyparaxylylene or parylene.

17. The membrane device according to claim 16 , wherein said liquid is an oil.

18. The membrane device according to claim 16 , wherein said substrate comprises an oleophobic material.

19. The membrane device according to claim 16 , wherein the layer of piezoelectric material is structured in a plurality of elements distributed along said channel to create locally a shock wave in the liquid, and wherein a slightly unsynchronized action of each element with regard to its neighbor enables propagation of the liquid in the channel.

20. A method for producing a membrane device in the form of a piezoelectric actuator according to claim 16 , said method comprising:

providing a substrate comprising a channel and a layer of a piezoelectric material deposited at the bottom of said channel and made accessible so as to connect it to an electrode,

depositing a liquid in said channel of said substrate, and

covering said liquid and at least one substrate portion bearing said liquid with a homogenous continuous thin film by means of a low-pressure deposition process,

said film being made of polyparaxylylene or parylene and forming a membrane fitting the contours of the substrate-liquid assembly,

and said liquid having a saturation vapor pressure lower than the deposit pressure and being chemically non-reactive with said polyparaxylylene or parylene.

21. The method according to claim 20 , wherein said liquid is an oil.

22. The method according to claim 20 , wherein said substrate comprises an oleophobic material.

23. The method according to claim 20 , wherein the layer of piezoelectric material is structured in a plurality of elements distributed along said channel to create locally a shock wave in the liquid, and wherein a slightly unsynchronized action of each element with regard to its neighbor enables propagation of the liquid in the channel.