EP 0754312 A1 19970122 - SERIES FOR PROGRESSIVE SPECTACLE LENSES
Title (en)
SERIES FOR PROGRESSIVE SPECTACLE LENSES
Title (de)
SERIE PROGRESSIVER BRILLENGLÄSER
Title (fr)
SERIE DE VERRES PROGRESSIFS DE LUNETTES
Publication
Application
Priority
- DE 9501499 W 19951028
- DE 4438506 A 19941029
- DE 19511613 A 19950330
Abstract (en)
[origin: US5880810A] PCT No. PCT/DE95/01499 Sec. 371 Date Jun. 28, 1996 Sec. 102(e) Date Jun. 28, 1996 PCT Filed Oct. 28, 1995 PCT Pub. No. WO96/13748 PCT Pub. Date May 9, 1996A series of progressive ophthalmic lenses, each having a varying surface power in a distance part and/or a varying increase in surface power from a distance part to a near part, includes a front surface having a continuously varying surface power and an eye-facing surface, principal sections of which have varying powers and at least one of which deviates from a circular form. The lenses have astigmatic power and are distinguished by a deviation (dz) between an apex circle and a sagitta of each principal section, as given by the equation:dz=aj*r2+bj*r4with coefficients |aj|</=2*10-4 mm-1|bj|</=1*10-6 mm-3and where coefficients aj2 and bj2 are yielded by the following functionals:aj=fj1 (sph,zyl)=aj1 (sph)+bj1 (sph)*zylbj=fj2 (sph,zyl)=aj2 (sph)+bj2 (sph)*zylwith coefficients aj2 and bj2 being a function of a second order.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
G02C 7/061 (2013.01 - EP US); G02C 7/065 (2013.01 - EP US); G02C 2202/08 (2013.01 - EP US)
Citation (search report)
See references of WO 9613748A2
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
US 5880810 A 19990309; AU 3800195 A 19960523; AU 710343 B2 19990916; EP 0754312 A1 19970122; JP 4024851 B2 20071219; JP H09507925 A 19970812; WO 9613748 A2 19960509; WO 9613748 A3 19960704
DOCDB simple family (application)
US 66311196 A 19960628; AU 3800195 A 19951028; DE 9501499 W 19951028; EP 95935816 A 19951028; JP 51424696 A 19951028