Method of manufacturing a spectacle lens
View Patent ↗What is described here is a method of manufacturing a spectacle lens in which the critical thickness is to be minimized in particular, comprising the following steps of operation: initially, a spectacle lens finished on one side (blank) is manufactured with a predetermined outsides contour and a round outside contour in particular, one part is cut out from the blank, whose outside contour corresponds approximately to the contour of the spectacle lens, the cut-out part is joined with the edge part with an axial offset in such a way that the edge part serves as handle for the subsequent machining operations.
1. Method of manufacturing a spectacle lens, wherein the critical thickness is to be minimized in particular, comprising the following steps of operation:
initially, a spectacle lens finished on one side (blank) is manufactured with a predetermined outside contour and a round outside contour in particular,
a cut-out part is cut from the blank, forming an outside contour of the cut-out part that corresponds approximately to the contour of the spectacle lens,
the cut-out part is joined with an edge part with an axial offset in such a way that the edge part serves as a handle for subsequent machining operations.
2. Method according to claim 1 , characterized in that the edge part serves for the manufacture of a second surface.
3. Method according to claim 1 , characterized in that a laser is used to cut the cut-out part.
4. Method according to claim 3 , characterized in that the edge part has the shape of a ring.
5. Method according to claim 4 , characterized in that the cut-out operation is carried out in such a way that the cutting surfaces of the cut-out part and of the edge part have the shape of a cylinder.
6. Method according to claim 5 , characterized in that the edge part is provided with a gap by the initial cutting operation.
7. Method according to claim 6 , characterized in that the cut-out part and the edge part are connected to each other by means of a clamping ring or a collar.
8. Method according to claim 1 , characterized in that the cut-out operation is carried out in such a way that the cutting surfaces of the cut-out part and of the edge part present the shape of a cone.
9. Method according to claim 8 , characterized in that after the cut-out part is lowered, relative to the edge part, in such a way that it adheres against the conical inner surface of the edge part.
10. Method according to claim 9 , characterized in that the cut-out part is fixed on the edge part.
11. Method according to claim 10 , characterized in that fixing is carried out by laser welding or adhesive bonding.
12. Method according to claim 11 , characterized in that a blank finished on the convex side is used as blank.
13. Method according to claim 12 , characterized in that during the machining operation on the second surface, the edge part, too, is machined and particularly cut and polished.
14. Method according to claim 13 , characterized in that the edge part serves as assistant in spectacle lens blocking.
15. Method according to claim 14 , characterized in that the spectacle lens is hardened together with the edge part, and is coated in particular in a coating installation.
16. Method according to claim 15 , characterized in that the edge part serves as information carrier for the further machining operations.
17. Method according to claim 10 , characterized in that fixing is carried out by laser welding and adhesive bonding.