Semi-finished lens, method and device for manufacturing an optical lens

1 . A method for manufacturing an optical lens, the method comprising:

providing a semi-finished lens comprising

a first optical surface comprising a surface design associated with a first reference system,

a second optical surface to be manufactured, the first and second optical surfaces being connected by an external periphery surface, and

a reference element provided on one or more of (i) the second optical surface, and (ii) the external periphery surface, the reference element being an engraving mark, a position of the reference element being defined with respect to the first reference system;

providing surface data corresponding to the second optical surface of the optical lens to be manufactured;

fixedly positioning the first optical surface of the semi-finished lens in a machining device in a blocking position with respect to a machining reference system of the machining device;

measuring tridimensional coordinates of the reference element using a mechanical probe;

determining the position of the reference element of the semi-finished lens in the machining reference system while the first optical surface is in the blocking position based on the measured tridimensional coordinates of the reference element;

determining the position of the first optical surface in the machining reference system using the determined position of the reference element in the machining reference system; and

manufacturing the second optical surface according to the surface data so that the second optical surface is orientated with respect to the determined position of the first optical surface in the machining reference system.

2 . The method for manufacturing an optical lens according to claim 1 , further comprising providing the position of the second optical surface to be manufactured relative to the first optical surface in the first reference system.

3 . The method for manufacturing an optical lens according to claim 1 , further comprising determining the position of the reference element relative to the first optical surface.

4 . A non-transitory computer readable medium on which is stored one or more sequences of instructions that are accessible to a processor and which, when executed by the processor, causes the processor to carry out the method of claim 1 .

5 . A machining device for manufacturing an optical lens, the machining device having a machining reference system, the machining device comprising:

a blocking system configured to fixedly position the first optical surface of a semi-finished lens in a machining device in a blocking position with respect to the machining reference system, the semi-finished lens comprising

a first optical surface comprising a surface design associated with a first reference system,

a second optical surface to be manufactured, the first and second optical surfaces being connected by an external periphery surface, and

a reference element provided on one or more of (i) the second optical surface and (ii) the external periphery surface, the reference element being an engraving mark, a position of the reference element being defined with respect to the first reference system;

a position tool comprising a probe configured to measure tridimensional coordinates of the reference element and determine the position of the reference element of the semi-finished lens in the machining reference system while the first optical surface is in the blocking position;

a processor configured to determine the position of the first optical surface in the machining reference system using the measured tridimensional coordinates of the reference element in the machining reference system; and

a machining tool configured to manufacture by machining the second optical surface according to surface data corresponding to the second optical surface of the optical lens to be manufactured so that the second optical surface is positioned with respect to the determined position of the first optical surface in the machining reference system.

6 . The machining device according to claim 5 , wherein the blocking system comprises a clamp configured to clamp the semi-finished lens in the blocking position, the clamp defining the machining reference system.

7 . The machining device according to claim 5 , wherein the position tool comprises a digital camera configured to acquire images of the reference element through the semi-finished lens in the blocking position, and

wherein the processor is further configured to determine the position of the reference element in the machining reference system using the images acquired by the camera while the first optical surface is in the blocking position.

8 . A method for manufacturing an optical lens, the method comprising:

providing a semi-finished lens including

a first optical surface comprising a surface design associated with a first reference system,

a second optical surface to be manufactured, the first and second optical surfaces being connected by an external periphery surface, and

a reference element provided at least partly on the second optical surface to be manufactured, the reference element being an engraving mark, a position of the reference element being defined with respect to the first reference system; providing surface data corresponding to the second optical surface of the optical lens to be manufactured;

fixedly positioning the first optical surface of the semi-finished lens in a machining device in a blocking position with respect to a machining reference system of the machining device;

measuring tridimensional coordinates of the reference element using a mechanical probe;

determining the position of the reference element of the semi-finished lens in the machining reference system while the first optical surface is in the blocking position based on the measured tridimensional coordinates of the reference element;

determining the position of the first optical surface in the machining reference system using the determined position of the reference element in the machining reference system; and

manufacturing the second optical surface according to the surface data so that the second optical surface is orientated with respect to the determined position of the first optical surface in the machining reference system.

9 . A machining device for manufacturing an optical lens, the machining device having a machining reference system, the machining device comprising:

a blocking system configured to position fixedly the first optical surface of a semi-finished lens in a machining device in a blocking position with respect to the machining reference system, the semi-finished lens including

a first optical surface comprising a surface design associated with a first reference system,

a second optical surface to be manufactured, the first and second optical surfaces being connected by an external periphery surface, and

a reference element provided at least partly on the second optical surface to be manufactured, the reference element being an engraving mark, a position of the reference element being defined with respect to the first reference system;

a position tool comprising a probe configured to measure tridimensional coordinates of the reference element and determine the position of the reference element of the semi-finished lens in the machining reference system while the first optical surface is in the blocking position;

a processor configured to determine the position of the first optical surface in the machining reference system using the measured tridimensional coordinates of the reference element in the machining reference system; and

a machining tool configured to manufacture by machining the second optical surface according to surface data corresponding to the second optical surface of the optical lens to be manufactured so that the second optical surface is positioned with respect to the determined position of the first optical surface in the machining reference system.