Method for packaging a spectacle lens
AssigneeEssilor International
InventorPatrick Henry
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for packaging an optical lens including two faces and a peripheral edge, at least one of the faces having a convexity marked by a peak point, the method including the following steps: a step of depositing a protective strip made from a rigid material at least partially along the edge, the width of the strip extending beyond the peak point of the convex face of the lens; a step of inserting the lens into an envelope delimited by a wall; a step of positioning the lens in the envelope, such that the protective strip acts as a spacer in order to maintain a distance between the wall of the envelope and the convex face of the lens and thus preventing any contact between the wall and the face.
Claims15
A method of packaging an optical lens including two faces and a peripheral circumferential edge, at least one convex face of said two faces having a convexity marked by a peak point, said method comprising:
- depositing a rigid material protective strip along a totality of a length of said peripheral circumferential edge, a width of the strip extending beyond the peak point of the at least one convex face of the lens, two ends of the protective strip overlapping one another along the peripheral circumferential edge forming an overlap over at least 1 cm thereby providing greater mechanical strength of the strip at the overlap in relation to remaining portions of the strip other than the overlap, the protective strip being at least partially elastic, the protective strip being tensioned when the protective strip is deposited over the peripheral circumferential edge of the lens with a tension of approximately 10 kN, the two ends of the protective strip being fixed together while the protective strip is tensioned around the peripheral circumferential edge of the lens;
- inserting the lens in an envelope delimited by a wall;
- and
- placing said lens in said envelope so that the protective strip serves as a spacer in order to maintain a distance between the wall of the envelope and the at least one convex face of said lens and thus to prevent any contact between said wall and said at least one convex face.
An optical lens package comprising:
- a lens comprising two faces and a peripheral circumferential edge, at least one convex face of said two faces having a convexity marked by a peak point;
- a rigid material protective strip deposited along a totality of a length of the peripheral circumferential edge of the lens, a width of the strip extending beyond the peak point of the at least one convex face of the lens, two ends of the protective strip overlapping one another along the peripheral circumferential edge forming an overlap over at least 1 cm thereby providing greater mechanical strength of the strip at the overlap in relation to remaining portions of the strip other than the overlap, the protective strip being at least partially elastic, the protective strip being tensioned with a tension of approximately 10 kN when deposited over the peripheral circumferential edge of the lens, the two ends of the protective strip being fixed together while the protective strip is tensioned around the peripheral circumferential edge of the lens;
- and
- an envelope delimited by a wall and comprising the lens inserted therein,
- wherein the lens is placed in said envelope so that the protective strip serves as a spacer in order to maintain a distance between the wall of the envelope and the at least one convex face of said lens to prevent any contact between said wall and said at least one convex face,
- the lens is one of (i) finished with a finished thickness, and (ii) semi-finished with a greater thickness than the finished thickness, and
- the protective strip is deposited along a totality of a width of the peripheral circumferential edge of the lens when the lens is finished and along only a portion of the width of the peripheral circumferential edge of the lens when the lens is semi-finished.
Dependencies are inferred from the claim text.