Title:
WAFERS FOR OPHTHALMIC SYSTEMS
Document Type and Number:
WIPO Patent Application WO2000020168
Kind Code:
A3
Abstract:
A polymeric front optical element blank is provided which may be laminated to a rear optical element blank. The polymeric front blank (2) comprises an optical element having an exterior convex surface (6) and an interior concave surface, with an edge (8) between the exterior convex surface and the interior concave surface. The optical is provided with at least two projections (10) which extend away from and higher than the edge on a side of the optical element having the concave surface. These projections assist in aligning a back optical element during lamination so that the two lenses will not move out of optical registry during lamination, especially where centrifugal forces are used to spread an adhesive between the front and rear lenses.
Inventors:
BLOMBERG CHRIS
LEVIN GERT
BHALAKIA SUJAL
LEVIN GERT
BHALAKIA SUJAL
Application Number:
PCT/US1999/023335
Publication Date:
September 21, 2000
Filing Date:
October 07, 1999
Export Citation:
Assignee:
BMC VISION EASE LENS INC (US)
International Classes:
B29C65/48; B29D11/00; G02C7/02; (IPC1-7): G02C7/02
Foreign References:
| US3195145A | 1965-07-13 | |||
| GB2260937A | 1993-05-05 | |||
| GB1195651A | 1970-06-17 | |||
| US5805263A | 1998-09-08 | |||
| EP0556646A1 | 1993-08-25 |
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