Optical device with adjustable optical surface

1. An adjustable optical device comprising at least a deformable optical surface activated by linear fluidic actuators, the optical device comprising:

a material layer comprising an upper surface on which the optical surface is provided and a bottom surface;

an actuator layer comprising a plurality of linear fluidic actuators separated by at least one cavity, where at least one linear fluidic actuator is a pillar extending in the actuation direction (L) which is non-parallel to the bottom surface of the material layer, said pillar comprising a wall delimiting an internal cavity and where an upper surface of said pillar is continuously linked to a zone of the bottom surface of the material layer; and

fluidic inlets suitable for introducing a fluid in at least one internal cavity of a pillar linear fluidic actuator,

wherein the upper surface of the pillar linear fluidic actuator(s) is continuously fixed to the zone of the bottom surface of the material layer by a fixing relationship selected from the group consisting of:

the pillar linear fluidic actuator(s) and the material layer are made continuously of the same material, and

the upper surface of the pillar linear fluidic actuator(s) is affixed to the zone of the bottom surface of the material layer.

2. The adjustable optical device of claim 1 , wherein the pillar linear fluidic actuator comprises a lower part consisting of the wall and the internal cavity and an upper part situated between the pillar upper surface and the pillar lower part.

3. The adjustable optical device of claim 1 , wherein the pillar linear fluidic actuator has a cylindrical external surface which axis extends in the actuation direction L.

4. The adjustable optical device of claim 1 , wherein the internal cavity is a cylinder which axis extends in the actuation direction L.

5. The adjustable optical device of claim 1 wherein the thickness of the pillar linear fluidic actuator's wall is between 0.1 to 2 mm.

6. The adjustable optical device of claim 2 , wherein the pillar linear fluidic actuator has a cylindrical external surface which axis extends in the actuator direction L, and wherein the height ratio h1/h2 is between 0.2 and 10, where h1 is the highest dimension of the internal cavity at rest according to the L direction and h2 is the distance at rest from the top of the upper surface of the internal cavity to the pillar's upper surface according to the L direction.

7. The adjustable optical device of claim 1 wherein the layer thickness ratio h3/h4 is comprised between 0.1 and 1, where h3 is the highest dimension at rest of the material layer according to the L direction and h4 is the highest dimension at rest of the actuator layer according to the L direction, and where h3 is comprised between 1 to 10 mm.

8. The adjustable optical device of claim 1 wherein the actuator layer is arranged on a substrate layer comprising the fluidic inlets.

9. The adjustable optical device of claim 1 , wherein the deformable optical surface is a light reflective surface.

10. The adjustable optical device of claim 1 comprising at least two optical surfaces wherein at least one of said surfaces is actuated by an actuator layer through a material layer and wherein said optical device is light transmissive.

11. A method for adjusting a deformable optical surface of an adjustable optical device according to claim 1 , wherein a plurality of fluidic pressures is provided within the internal cavities of the pillar linear fluidic actuators and a constant pressure Po is provided within the cavity(ies) which separate(es) the pillar linear fluidic actuators.

12. A method for providing a lens for a wearer, comprising the steps of:

providing an adjustable optical device according to claim 10 to the wearer; and

adjusting the fluidic pressures of a plurality of internal cavities of the pillar linear fluidic actuators so as to obtain a desired optical system.

13. A method for manufacturing an adjustable optical device according to claim 1 , comprising the steps of:

providing a mold with a plurality of closed shapes defining the external contours of the cavities of the linear fluidic actuator layer; and

providing at least the wall material by moulding.

14. The adjustable optical device of claim 1 wherein the thickness of the pillar linear fluidic actuator's wall is equal or greater to 0.25 mm and/or equal or less to 0.75 mm.

15. The adjustable optical device of claim 4 , wherein the pillar linear fluidic actuator has a cylindrical external surface which axis extends in the actuator direction L, and wherein the height ratio h1/h2 is equal or greater to 0.5 and/or equal or less to 2 , where h1 is the highest dimension of the internal cavity at rest according to the L direction and h 2 is the distance at rest from the top of the upper surface of the internal cavity to the pillar's upper surface according to the L direction.

16. The adjustable optical device of claim 1 wherein the layer thickness ratio h3/h4 is equal or greater to 0.2 and/or equal or less to 0.5, where h3 is the highest dimension at rest of the material layer according to the L direction and h4 is the highest dimension at rest of the actuator layer according to the L direction, and where h3 is equal or greater to 2 mm and/or equal or less to 5 mm.