EP1395869A2 - B-spline-optimierung von optischen gläsern und insbesondere brillengläsern mit symmetrieebenen - Google Patents
B-spline-optimierung von optischen gläsern und insbesondere brillengläsern mit symmetrieebenenInfo
- Publication number
- EP1395869A2 EP1395869A2 EP02716592A EP02716592A EP1395869A2 EP 1395869 A2 EP1395869 A2 EP 1395869A2 EP 02716592 A EP02716592 A EP 02716592A EP 02716592 A EP02716592 A EP 02716592A EP 1395869 A2 EP1395869 A2 EP 1395869A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- symmetry
- spline
- area
- plane
- areas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
Definitions
- the invention relates to a method for optimizing an in particular ator surface of an optical glass and in particular a spectacle lens, which has at least one plane of symmetry.
- atoric surface in the general sense is understood to mean a surface with two different main sections, at least one of which deviates from the circular shape.
- the curvature of the two main sections in the apex of the spectacle lens can be the same that the atoric deviations of the main sections from the circular shape only serve to correct image errors, but it is of course also possible that the curvature of the two main sections in the apex of the spectacle lens differs in such a way that the resulting astigmatism serves to correct a corresponding eye astigmatism.
- the geometry of the surface on the eye side can be determined in such a way that it not only produces the dioptric effect specified in the respective prescription of the glasses, but also corrects image errors that result from the use of a progressive surface that has been calculated for a specific position of use a different position of use - different pupil spacing, different forward inclination, different cornea / vertex spacing etc. than required for the optimization of the progressive surface.
- an atorus with a plane of symmetry that is not represented by splines is used, and not an asymmetrical atorus that can be represented and optimized with B-spline functions.
- a B-spline would be more advantageous than the functions used in conventional optimization, since, in contrast to the conventional representation of a particularly symmetrical atorus, the local properties (limited carrier) of a B-spline can be used to optimize the runtime reduce the structure of the sparsely populated matrices.
- a piecewise interpolation of low order takes place, ie one always interpolates only over a few interpolation points of an interval and assembles the interpolation polynomials, with at least the first and the second derivative at the interfaces being continuous. Interpolation formulas with derivatives can also be used.
- the B-spline does not provide the symmetrical surface that is sometimes desired for the reasons mentioned, so that the use of B-splines to represent and optimize surfaces with one or more planes of symmetry has not been considered in the prior art is.
- the invention is therefore based on the object of specifying a method for optimizing an atoric surface and in particular a prescription surface of a spectacle lens, in which a general atoric surface, which is represented by B-splines, is optimized in such a way that predeterminable symmetry conditions also after the Optimization are adhered to.
- the basic ideas according to the invention enable a B-spline to be symmetrized, so that even after the optimization it describes a surface which has one, two or more planes of symmetry.
- a method for optimizing an (in the general sense) atoric surface is nes optical glass and in particular a spectacle lens that has at least one plane of symmetry, which is characterized by the combination of the following features: the atoric surface with at least one plane of symmetry is divided into at least two areas separated by the at least one plane of symmetry, one of the separate areas this area (area shown) is represented by a set of coefficients of B-spline functions, the arrow heights of the area shown are calculated by B-spline interpolation, the arrow heights in the at least one other area are calculated by mirroring the coefficients or of the coordinates on the at least one plane of symmetry, and the atoric surface is optimized solely by varying the B-spline coefficient set of the area shown.
- the surface shown and optimized according to the invention is an atoric surface in the general sense. This means that the two main cuts of this surface are neither spherical cuts nor have to be identical.
- This generally atoric surface in this sense can, but need not necessarily, have a surface astigmatism that is suitable for compensating the astigmatism of an astigmatic eye.
- the astigmatism resulting from the different course of the two main sections can also only be used to compensate for an undesirable astigmatism of the Serve glasses with an otherwise astigmatism-free eye.
- the two regions into which the surface is divided are hemispheres.
- the plane of symmetry runs through the geometric center of a tubular spectacle lens.
- Certain prescription values can, however, also be optimally achieved with spectacle lenses with an atoric surface that has two planes of symmetry. This shows particularly clearly that the increase in the number of symmetry levels can significantly reduce the computational effort.
- this area is divided into four areas separated by the two planes of symmetry.
- One of the four areas (shown area) is then represented by a coefficient set of B-spline functions.
- the arrow heights of the displayed area are calculated by B-spline interpolation.
- the arrow heights in the other three areas are calculated by mirroring the coefficients or the coordinates at the first and the second plane of symmetry as well as at both planes of symmetry together.
- the atoric surface is optimized solely by varying the B-spline coefficient set of the area shown.
- the B-spline used is two-dimensional.
- the coefficient matrix to be optimized has n z / 2 rows and n s / 2 columns in the case of a plane of symmetry and n z / 4 rows and n s / 4 columns in the case of two planes of symmetry, n 2 and n s is the number of rows or columns that would (would) be needed to display the entire area with B-splines.
- the B-spline coefficient set of the displayed area is iteratively varied in cycles until selected imaging errors - which may be selected according to a company philosophy - one for the respective one
- Mapping errors fall below the specified limit.
- target functions can also be used which are formed from a plurality of imaging errors. The area is then optimized until the (respective) target function falls below an (individually) specified limit.
- mapping errors or the target functions are only calculated for a plurality of points (evaluation points representing the surface at which the iteration problem is given).
- the evaluation points can in particular - but do not have to - form an equidistant grid.
- the computing effort in the method according to the invention is further reduced if a "pre-optimized" surface is used to calculate the atoric surface according to the invention.
- the optimized area is calculated as a B-spline area based on a first assumed B-spline coefficient matrix (start coefficient matrix).
- start coefficient matrix a first assumed B-spline coefficient matrix
- variable vector which determines the direction of descent of the target function can be determined using the value of the target function and suitable algorithms.
- suitable algorithms of this type can be, for example, the Gauss-Newton method, a quasi-Newton method or similar methods.
- the procedure can be such that the calculated variable vector is suitably copied into the B-spline coefficient matrix, so that in this way a further B-spline coefficient matrix is available as the basis for a further optimization cycle.
- the optimization by varying the B-spline coefficient set is carried out iteratively until the target function is sufficiently minimized.
- cubic splines or 4th order splines can be used as B splines.
- evaluation points are placed in the vicinity of the at least one plane of symmetry.
- the atoric surface also serve to correct an eye astigmatism, the axial position of which is deviates from the horizontal or vertical axis, it is preferred if the at least one plane of symmetry is perpendicular to the axis position or parallel to it. The same applies to oblique prisms.
- the optimization routine calls the target function during the program run, the following happens:
- the variable vector proposed by the optimization routine is suitably copied into the B-spline coefficient matrix, so that the current B-spline area is obtained.
- the mapping properties are then calculated for this area and finally the target function is determined by subtracting the ACTUAL values of the mapping properties from the TARGET values or the ideal specifications.
- the value of this objective function and possibly the Jakobi matrix is returned to the optimization routine, and this determines the direction of descent based on the algorithms used (Gauss-Newton, Quasi-Newton or the like).
- the coefficient matrix therefore does not have n 2 rows and n s columns, but only n s / 2 columns and n z rows or n s columns and n z / 2 rows.
- mapping properties do not have to be recalculated at all evaluation points, but only those in a small environment. Above all, this saves complex and therefore expensive main jet iterations.
- the local property of the B-splines allows the use of algorithms that use the weak population of the matrices.
- the areas are no longer restricted by the mathematical approach used (eg meridional generators), but - apart from the symmetry level - their performance is typical of splines: they are "free-form areas”.
- the plane of symmetry at which the coefficients or coordinates are reflected when evaluating the arrow height does not have to be vertical or horizontal in space.
- oblique cylinders or oblique prisms it will make sense to choose them more skillfully, for example perpendicular to or parallel to the axis.
- FIG. 2 shows an example of a B-spline coefficient set describing an area, the area having a plane of symmetry.
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10106386 | 2001-02-12 | ||
DE10106386A DE10106386A1 (de) | 2001-02-12 | 2001-02-12 | B-Spline-Optimierung von optischen Gläsern und insbesondere Brillengläsern mit Symmetrieebenen |
PCT/DE2002/000496 WO2002065195A2 (de) | 2001-02-12 | 2002-02-12 | B-spline-optimierung von optischen gläsern und insbesondere brillengläsern mit symmetrieebenen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1395869A2 true EP1395869A2 (de) | 2004-03-10 |
Family
ID=7673712
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02716592A Withdrawn EP1395869A2 (de) | 2001-02-12 | 2002-02-12 | B-spline-optimierung von optischen gläsern und insbesondere brillengläsern mit symmetrieebenen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6974214B2 (de) |
EP (1) | EP1395869A2 (de) |
JP (1) | JP2004522184A (de) |
AU (1) | AU2002247597A1 (de) |
DE (1) | DE10106386A1 (de) |
WO (1) | WO2002065195A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10106386A1 (de) | 2001-02-12 | 2002-09-12 | Rodenstock Optik G | B-Spline-Optimierung von optischen Gläsern und insbesondere Brillengläsern mit Symmetrieebenen |
EP2177943A1 (de) * | 2008-10-16 | 2010-04-21 | Essilor International (Compagnie Générale D'Optique) | Bestimmung eines optischen Systems anhand erweiterter Kriterien |
DE102011009473B4 (de) * | 2010-04-28 | 2022-03-17 | Rodenstock Gmbh | Computerimplementiertes Verfahren zur Berechnung eines Brillenglases mit blickwinkelabhängigen Verordnungsdaten, Vorrichtung zum Berechnen oder Optimieren eines Brillenglases, Computerprogrammerzeugnis, Speichermedium, Verfahren zum Herstellen eines Brillenglases sowie Verwendung eines Brillenglases |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3517321A1 (de) * | 1985-05-14 | 1986-11-20 | Fa. Carl Zeiss, 7920 Heidenheim | Multifokale brillenlinse mit mindestens einer gleitsichtflaeche |
DE4210008A1 (de) * | 1992-03-27 | 1993-09-30 | Zeiss Carl Fa | Brillenlinse |
ES2183466T3 (es) * | 1994-03-30 | 2003-03-16 | Rodenstock Optik G | Serie de cristales progresivos para gafas. |
WO1996013748A2 (de) * | 1994-10-29 | 1996-05-09 | Optische Werke G. Rodenstock | Serie progressiver brillengläser |
US6012813A (en) * | 1997-06-19 | 2000-01-11 | Hoya Corporation | Aspherical spectacle lens |
IL133301A0 (en) * | 1998-06-04 | 2001-04-30 | Sola Int Holdings | Shaped ophthalmic lenses |
DE19960826A1 (de) * | 1999-12-16 | 2001-07-05 | Rodenstock Optik G | Einstärken-Brillenglas mit Vollkorrektion |
DE10106386A1 (de) | 2001-02-12 | 2002-09-12 | Rodenstock Optik G | B-Spline-Optimierung von optischen Gläsern und insbesondere Brillengläsern mit Symmetrieebenen |
-
2001
- 2001-02-12 DE DE10106386A patent/DE10106386A1/de not_active Withdrawn
-
2002
- 2002-02-12 US US10/467,717 patent/US6974214B2/en not_active Expired - Fee Related
- 2002-02-12 JP JP2002564654A patent/JP2004522184A/ja active Pending
- 2002-02-12 EP EP02716592A patent/EP1395869A2/de not_active Withdrawn
- 2002-02-12 AU AU2002247597A patent/AU2002247597A1/en not_active Abandoned
- 2002-02-12 WO PCT/DE2002/000496 patent/WO2002065195A2/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO02065195A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002065195A3 (de) | 2003-05-08 |
US20040114100A1 (en) | 2004-06-17 |
US6974214B2 (en) | 2005-12-13 |
WO2002065195A2 (de) | 2002-08-22 |
AU2002247597A1 (en) | 2002-08-28 |
JP2004522184A (ja) | 2004-07-22 |
DE10106386A1 (de) | 2002-09-12 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ESSER, GREGOR Inventor name: PFEIFFER, HERBERT Inventor name: ALTHEIMER, HELMUT Inventor name: DORSCH, RAINER Inventor name: WELK, ANDREA Inventor name: HAIMERL, WALTER Inventor name: BAUMBACH, PETER |
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Owner name: RODENSTOCK GMBH |
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Owner name: RODENSTOCK GMBH |
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