Sensing system with different upper layers

1. A sensing system (S) that detects touch, comprising:

at least an intermediate layer ( 1 );

at least an upper layer ( 4 ) located on the intermediate layer ( 1 );

at least one light source ( 2 ) located under the intermediate layer ( 1 );

at least one image sensor ( 3 ) located under the intermediate layer ( 1 );

at least a first fiber optic bundle ( 5 a ) which comprises a plurality of fiber optic cables positioned such that a tips of which is facing to the light source ( 2 ) and other tips of which is facing to the said intermediate layer ( 1 ), and which transmits the light obtained from the light source ( 2 ) to the upper layer ( 4 ) located on the intermediate layer ( 1 );

at least a second fiber optic bundle ( 5 b ) which comprises a plurality of fiber optic cables, a tips of which is paired with at least one pixel of the image sensor ( 3 ) and other tips of which is positioned facing to the said intermediate layer ( 1 ), and which transmits the image of the upper layer ( 4 ) located on the intermediate layer ( 1 ) to the image sensor ( 3 );

at least one control unit which analyzes the image captured by the image sensor ( 3 ) using image processing techniques so as to calculate a force applied on the intermediate layer ( 1 ); and

at least a data link ( 6 ) for data communication between the image sensor ( 3 ) and the control unit

characterized in that the said upper layer ( 4 ) comprises a polarized film or a piezochromic material as a material that changes color with force.

2. A sensing system (S) according to claim 1 , characterized in that the said upper layer ( 4 ) comprises at least one pattern ( 7 ).

3. A sensing system (S) according to claim 2 , characterized in that the said pattern ( 7 ) is in the form of a chess board.

4. A sensing system (S) according to claim 1 , characterized in that the said piezochromic material is reversible.

5. A sensing system (S) according to claim 1 , characterized in that the said upper layer ( 4 ) comprises a first layer positioned at its side close to the surrounding environment and a second layer positioned at its side distant to the surrounding environment and containing an irreversible piezochromic material.

6. A sensing system (S) according to claim 5 , characterized in that the said first layer comprises a reversible piezochromic material.

7. A sensing system (S) according to claim 1 , characterized in that the upper layer ( 4 ) comprises at least an outer layer ( 8 ); at least an elastic element ( 9 ) positioned under the outer layer ( 8 ); and a plurality of obstacles ( 10 ) positioned in the elastic element ( 9 ) and which are in the form of a light-proof particle such that its color is different from the outer layer ( 8 ).

8. A sensing system (S) according to claim 7 , characterized in that the said elastic element ( 9 ) is in the form of a gel.

9. A sensing system (S) that detects touch, comprising:

at least an intermediate layer ( 1 );

at least an upper layer ( 4 ) located on the intermediate layer ( 1 );

at least one light source ( 2 ) located under the intermediate layer ( 1 );

at least one image sensor ( 3 ) located under the intermediate layer ( 1 );

at least a first fiber optic bundle ( 5 a ) which comprises a plurality of fiber optic cables positioned such that a tips of which is facing to the light source ( 2 ) and other tips of which is facing to the said intermediate layer ( 1 ), and which transmits the light obtained from the light source ( 2 ) to the upper layer ( 4 ) located on the intermediate layer ( 1 );

at least a second fiber optic bundle ( 5 b ) which comprises a plurality of fiber optic cables, a tips of which is paired with at least one pixel of the image sensor ( 3 ) and other tips of which is positioned facing to the said intermediate layer ( 1 ), and which transmits the image of the upper layer ( 4 ) located on the intermediate layer ( 1 ) to the image sensor ( 3 );

at least one control unit which analyzes the image captured by the image sensor ( 3 ) using image processing techniques so as to calculate a force applied on the intermediate layer ( 1 ); and

at least a data link ( 6 ) for data communication between the image sensor ( 3 ) and the control unit

characterized in that the said upper layer ( 4 ) comprises a phosphor and/or any other material that stores a part of the light in itself but proceeds to emit light when the light coming from the light source is cut off.

10. A sensing system (S) that detects touch, comprising:

at least an intermediate layer ( 1 );

at least an upper layer ( 4 ) located on the intermediate layer ( 1 );

at least one light source ( 2 ) located under the intermediate layer ( 1 );

at least one image sensor ( 3 ) located under the intermediate layer ( 1 );

at least a first fiber optic bundle ( 5 a ) which comprises a plurality of fiber optic cables positioned such that a tips of which is facing to the light source ( 2 ) and other tips of which is facing to the said intermediate layer ( 1 ), and which transmits the light obtained from the light source ( 2 ) to the upper layer ( 4 ) located on the intermediate layer ( 1 );

at least a second fiber optic bundle ( 5 b ) which comprises a plurality of fiber optic cables, a tips of which is paired with at least one pixel of the image sensor ( 3 ) and other tips of which is positioned facing to the said intermediate layer ( 1 ), and which transmits the image of the upper layer ( 4 ) located on the intermediate layer ( 1 ) to the image sensor ( 3 );

at least one control unit which analyzes the image captured by the image sensor ( 3 ) using image processing techniques so as to calculate a force applied on the intermediate layer ( 1 ); and

at least a data link ( 6 ) for data communication between the image sensor ( 3 ) and the control unit

characterized in that the upper layer ( 4 ) partially transmits light.