Method for mounting an optical lens to be polished

1. A method for mounting an optical lens to be polished on a spindle of a polishing device, the optical lens comprising a first and a second main surface, the method comprising:

an optical lens providing step, in which an optical lens whose first main surface is to be polished is provided; and

a mounting step, in which the optical lens is mounted on the spindle,

wherein the mounting step further comprises a support device positioning step, in which a support device is positioned between the spindle and the second surface of the optical lens so as to be rotated by the spindle and to have a contact surface partly in contact with the second main surface of the optical lens that partly extends beyond the second main surface of the optical lens so as to extend the second main surface of the optical lens; and

wherein the contact surface of the support device is at least partly covered with a membrane having a Shore-hardness greater or equal to 40 D and smaller or equal to 100 D.

2. The method according to claim 1 , wherein the support device presents a modulus of elasticity greater or equal to 0.1 MPa and smaller or equal to 1 MPa.

3. The method according to claim 1 , wherein the contact surface of the support device is at least partly covered with a membrane having a tensile strength greater or equal to 10 MPa and smaller or equal to 20 MPa.

4. The method according to claim 1 , wherein the membrane is made of an elastomer.

5. The method according to claim 1 , wherein the contact surface is totally covered with a membrane.

6. The method according to claim 1 , wherein the membrane presents a resistance to traction of at least 0.5 N/mm 2 .

7. The method according to claim 1 , wherein the membrane presents a tear resistance of at least 2 N/mm.

8. The method according to claim 1 , wherein the support device is made of foam.

9. The method according to claim 1 , wherein at least 10% of the contact surface of the support device extends beyond the second main surface of the optical lens.

10. The method according to claim 1 , wherein the optical lens and the support device have circular or elliptic shapes and where the ratio between the diameters or the major axis of the support device and of the optical lens is greater or equal to 1.1.

11. The method according to claim 1 , wherein the support device has a thickness of at least 0.5 mm.

12. The method according to claim 1 , wherein the support device and the spindle are interlocked.

13. A method for polishing an optical lens, wherein the optical lens is mounted to a spindle of a polishing tool, the optical lens comprising a first and a second main surface, the method comprising:

an optical lens providing step, in which an optical lens whose first main surface is to be polished is provided,

a mounting step, in which the optical lens is mounted on the spindle,

wherein the mounting step further comprises a support device positioning step, in which a support device is positioned between the spindle and the second surface of the optical lens so as to be rotated by the spindle and to have a contact surface partly in contact with the second main surface of the optical lens that partly extends beyond the second main surface of the optical lens so as to extend the second main surface of the optical lens; and

wherein the contact surface of the support device is at least partly covered with a membrane having a Shore-hardness greater or equal to 40 D and smaller or equal to 100 D.

14. A method for mounting an optical lens to be polished on a spindle of a polishing device, the optical lens comprising a first and a second main surface, the method comprising:

an optical lens providing step, in which an optical lens whose first main surface is to be polished is provided; and

a mounting step, in which the optical lens is mounted on the spindle,

wherein the mounting step further comprises a support device positioning step, in which a support device is positioned between the spindle and the second surface of the optical lens so as to be rotated by the spindle and to have a contact surface partly in contact with the second main surface of the optical lens that partly extends beyond the second main surface of the optical lens so as to extend the second main surface of the optical lens; and

wherein the contact surface of the support device is at least partly covered with a membrane having a tensile strength greater or equal to 10 MPa and smaller or equal to 20 MPa.

15. The method according to claim 14 , wherein the support device presents a modulus of elasticity greater or equal to 0.1 MPa and smaller or equal to 1 MPa.

16. The method according to claim 14 , wherein the membrane is made of an elastomer.

17. The method according to claim 14 , wherein the contact surface is totally covered with a membrane.

18. The method according to claim 14 , wherein the membrane presents a resistance to traction of at least 0.5 N/mm 2 .

19. The method according to claim 14 , wherein the membrane presents a tear resistance of at least 2 N/mm.

20. A method for polishing an optical lens , wherein the optical lens is mounted to a spindle of a polishing tool, the optical lens comprising a first and a second main surface, the method comprising:

an optical lens providing step, in which an optical lens whose first main surface is to be polished is provided,

a mounting step, in which the optical lens is mounted on the spindle,

wherein the mounting step further comprises a support device positioning step, in which a support device is positioned between the spindle and the second surface of the optical lens so as to be rotated by the spindle and to have a contact surface partly in contact with the second main surface of the optical lens that partly extends beyond the second main surface of the optical lens so as to extend the second main surface of the optical lens; and

wherein the contact surface of the support device is at least partly covered with a membrane having a tensile strength greater or equal to 10 MPa and smaller or equal to 20 MPa.