G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 17/02 (2006.01) G01B 17/06 (2006.01) G01M 11/02 (2006.01)
Patent
CA 2366499
The application relates to a method and device for simultaneously measuring the center material thickness and back radius of curvature of a lens, and in particular a toric disposable opthalmic lens. An ultrasound wave is radiated by a transducer towards a lens and reflected off the front and back surfaces of the lens. Based on the lapse in time between respective echoes the center material thickness and the sagittal height of the lens is determined. The back radius of curvature is calculated from known geometric relationships between the chord of a circle and the sagittal height.
La présente invention concerne un procédé et un dispositif permettant de mesurer simultanément l'épaisseur du matériau central et le rayon de courbure postérieur d'une lentille, et notamment d'une lentille ophtalmique torique jetable. Une onde ultrasonore est émise vers une lentille par un transducteur et réfléchie par les surfaces antérieure et postérieure de la lentille. En fonction de l'intervalle de temps entre les échos respectifs, on détermine l'épaisseur centrale et la hauteur sagittale de la lentille. Le rayon de courbure postérieur est calculé à partir des relations géométriques connues entre la corde d'un cercle et la hauteur sagittale.
Ebel James A.
Lewis Yulin
Longo Jeffrey
Rice Brian
Ross Denwood F.
Johnson & Johnson Vision Care Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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