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US 7,125,117 B2Granted
Opthalmic lens preform
AssigneeEssilor International
InventorsAlain Chansavoir, Eric Comte, Frank Paggetti, Jean Francois Belly
Life of this patent
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Abstract
The invention concerns an ophthalmic lens preform having intrinsically at least a mechanical angular indexing member (7, 8). It is applicable to the manufacture of lenses in mineral or organic material.
Claims24
An ophthalmic lens preform or blank, having, intrinsically, at least one element for mechanical angular registration,
- wherein the perform has two main faces, one of which is concave, and a peripheral edge joining the said two faces,
- wherein the edge of the preform has a major portion and a clamping portion, with the major portion being undercut and the clamping portion being substantially cylindrical adjacent to the concave face.
Dependencies are inferred from the claim text.