WO2001018590A2 - Procede de nettoyage d'articles - Google Patents
Procede de nettoyage d'articles Download PDFInfo
- Publication number
- WO2001018590A2 WO2001018590A2 PCT/US2000/015470 US0015470W WO0118590A2 WO 2001018590 A2 WO2001018590 A2 WO 2001018590A2 US 0015470 W US0015470 W US 0015470W WO 0118590 A2 WO0118590 A2 WO 0118590A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- diopters
- preform
- distance
- convex
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
Definitions
- the present invention relates to ophthalmic lenses.
- the invention provides methods for producing a full prescriptive range of spectacle lenses while minimizing the number of the optical preforms, molds, or both required to produce the lenses.
- spectacle lenses for the correction of ametropia
- multifocal lenses such as progressive addition lenses (“PAL's")
- PAL's progressive addition lenses
- the manufacture of a full range of prescriptions for spectacle lenses, particularly multifocal lenses such as PAL's, by certain methods, such as surface casting, is problematic in that it requires a large number of lens shapes. This is especially true for prescriptions that include toric, or cylindric, correction of the lens wearer's astigmatism.
- a typical range of prescriptive lenses with toric correction may have 49 distance powers, 10 cylinder powers, 180 cylinder axes, and 9 add powers for a total of 794,241 different prescriptions.
- maintenance of such a large stock of lens shapes is impractical.
- FIG. 1 is a cross-sectional view of an embodiment of the lens of the invention.
- FIG. 2 is a cross-sectional view of an embodiment of the lens of the invention.
- FIG. 3 is a cross-sectional view of an embodiment of the lens of the invention.
- FIG. 4 is a cross-sectional view of an embodiment of the lens of the invention.
- FIG. 5 is a cross-sectional view of an embodiment of the lens of the invention.
- FIG. 6 is a cross-sectional view of an embodiment of the lens of the invention.
- the present invention provides methods for producing spectacle lenses, including multifocal lenses such as progressive addition lenses, as well as lenses produced by the methods.
- the invention permits production of the full prescriptive range of lenses while reducing the number of optical preforms, molds, or both required. It is one discovery of the invention that a full prescriptive range of spectacle lenses may be produced by both minimizing the optical preform curves used and adding power onto the preform to produce the desired lens.
- the invention provides a method for producing a lens comprising, consisting essentially of, and consisting of the steps of: a.) providing an optical preform having a first distance power, the preform comprising, consisting essentially of, and consisting of a convex and a concave surface; and b.) adding onto at least one of the convex or concave surfaces one or more layers comprising, consisting essentially of, and consisting of a second distance power.
- the distance power of the lens will be the sum of the first and second distance powers.
- optical preform is meant a shaped, optically transparent article capable of refracting light and possessing a convex and a concave surface, which article is suitable for use in producing a spectacle lens.
- an optical preform having a portion of the distance power of the desired lens. Additional distance power is then added in one or more layers to the preform to obtain the desired final distance prescription for the lens. It is a discovery of the invention that the manufacture of multifocal lenses may be more efficiently accomplished by the use of an optical preform having a given distance power onto which additional distance power is added. By distributing the distance power of the final, desired lens between the preform and one or more layers added to the preform, the number of preforms, molds, or both necessary to produce a full prescriptive range of spectacle lenses is reduced in relation those used in conventional surface casting techniques.
- the distribution of distance power between the preform and layer or layers added to the preform may be any of a variety of increments.
- the following preform distance powers are used with the listed base curves and added distance powers: about +2 to about + 5 with a base curve of about -1 to about -4 and added power of about 0 to about +6 diopters; about 0 to about +3 diopters with a base curve of about -2 to about -6 diopters and added power of about 0 to about +6 diopters; about -1 to about +1 diopters with a base curve of about -4 to about -6 diopters and added power of about -6 to about +6; and -1 to about -5 with a base curve of about -4 to about -9 with added power of about 0 to about -6 diopters.
- the distance power of the preform be selected from the following powers: about +3.50 diopters; about +1.50 diopters; about 0.00 diopters; or about -3.00 diopters.
- the concave surface of the preform be of one of the following base curvatures: about -2.50 diopters; about -4.00 diopters; about -5.50 diopters; or about -7.00 diopters.
- any distance power increment may be added to the preform, it is preferred that the added layer be added onto the convex surface for the specific preform and concave surface curvature be as set forth in Table 1. All values in Table 1 are to be assumed to be proceeded by the phrase "about.” Table 1
- any type of lens such as single vision, flat-top, multifocal including, without limitation, bifocal, trifocal, progressive, or the like, may be produced using the method of the invention.
- the invention may find greater utility in the production of multifocal lenses, particularly progressive addition lenses. Further, the invention may find its greatest utility in the production of progressive addition lenses using surface casting.
- the desired final lens is a bifocal
- the preform, the added layer, or both must provide near vision power in addition to distance power.
- the preform, layer, or both must provide near vision power, distance power and a zone of transition power between the distance and near vision power zones.
- a surface of the preform or an added layer may be a progressive addition surface thus providing a progressive addition lens as the final lens.
- progressive addition surface is meant a continuous, aspheric surface having distance and near vision zones and a zone of transition power, or zone of increasing dioptric power, connecting the distance and near vision zones.
- a progressive addition lens is provided by distributing the dioptric add power of the final lens between the preform and the added layer or layers.
- dioptric add power is meant the amount of dioptric power difference between the near and distance vision zones of a surface or lens.
- a portion of the dioptric add power may be on the concave surface of the preform and the remaining dioptric add power in a layer or layers added onto the convex surface of the preform.
- a portion of the dioptric add power is on the convex surface of the preform and additional dioptric add power is added onto the concave surface of the preform.
- the dioptric add power of the preform is distributed between the concave and convex surface of the preform and additional distance power, alone or with other power, is added onto one or both of these surfaces.
- the preform and added layer materials must be selected so that the refractive index of the preform differs from that of the added layer by about 0.01 or greater. However, because the greater the difference in refractive indices, the greater will be a particular curvature's contribution to power, preferably the difference is about 0.05 or greater.
- the total dioptric add power for the lens may be about +0.01 to about +3.50, preferably about +0.25 to about +3.50, more preferably about +1.00 to about +3.00 diopters.
- the total dioptric add power may be split, or distributed, between the preform and added layer or layers in a ratio of about 90: 10 to about 10:90 percent, preferably about 70:30 to about 30:70 percent, more preferably about 60:40 to about 40:60 percent.
- the concave surface of the optical preform is symmetric and the convex surface of the finished lens is asymmetric.
- symmetric is meant that the power and astigmatism maps of the surface are symmetric about the center meridian of the surface.
- the concave surface of the preform may have a cylinder power for correction of the lens wearer's astigmatism.
- cylinder power is meant the difference in powers measured in the two principal meridians of a preform or a lens.
- the cylinder power also may be located on the convex surface of the preform or distributed between the concave or convex surface of the preform and the added layer or layers.
- the concave surface of the preform has all of the cylinder power desired for the lens.
- the total cylinder power for the lens may be about -0.125 to about -6.00 diopters, preferably about -0.25 to about -3.00 diopters.
- the invention encompasses any one of a number of preform and added layer combinations of distance vision power with one or one or more of dioptric add power, transition power, and cylinder power.
- the invention provides a method for producing a spectacle lens comprising, consisting essentially of and consisting of: a.) providing an optical preform having a first distance power, the preform comprising, consisting essentially of, and consisting of a convex and a concave surface wherein one or both of the convex and concave surfaces has a power selected from the group consisting of dioptric add power, a zone of transition power, cylinder power, and combinations thereof; and b.) adding onto at least one of the convex or concave surfaces of the preform one or more layers comprising, consisting essentially of, and consisting of a second distance power.
- the invention provides a method for producing a spectacle lens comprising, consisting essentially of, and consisting of: a.) providing an optical preform having a first distance power, the preform comprising, consisting essentially of, and consisting of a convex and a concave surface wherein one or both of the convex and concave surfaces has a power selected from the group consisting of a first dioptric add power, a first zone of transition power, a first cylinder power, and combinations thereof; and b.) adding onto at least one of the convex or concave surfaces one or more layers comprising, consisting essentially of, and consisting of a second distance power and a power selected from the group consisting of a second dioptric add power, a second zone of transition power, a second cylinder power, and combinations thereof .
- the preforms required for such a combination may be reduced further by limiting the dioptric add power location to eight orientations relative to the cylinder axis. In this case a dioptric add power is not provided for every cylinder axis combination.
- a rotational misalignment of the near vision zone of the concave surface relative to that of the added layer of about + or - 1 to about + or - 25, preferably + or - 1 to about + or - 20, more preferably + or - 1 to about + or - 15 degrees may be used.
- the optical preforms useful in the invention may be made of any suitable materials.
- suitable materials include, without limitation, polycarbonates, such as bisphenol A polycarbonates, allyl diglycol carbonates, such as diethylene glycol bisallyl carbonate (CR-39TM), allylic esters, such as triallyl cyanurate, triallyl phosphate and triallyl citrate, acrylic esters, acrylates, methacrylates, such as methyl- ethyl- and butyl methacrylates, styrenics, polyesters, and the like and combinations thereof.
- the preform may be produced by any convenient means including, without limitation, injection molding, injection- compression molding, thermoforming, casting, or the like.
- the added distance power, dioptric add power, transition power, and cylinder power may be added by any convenient method.
- Suitable methods for adding one or more layers onto the preform include, without limitation, casting, surface casting, coating, thermoforming, injection molding and the like.
- Preferably the added layer or layers are surface cast onto the preform.
- Surface casting of the layer or layers onto the preform may be accomplished by any known method.
- Suitable methods for casting the convex and concave surfaces of a preform are disclosed in United States Patent Nos. 5,147,585, 5,178,800, 5,219,497, 5,316,702, 5,358,672, 5,480,600, 5,512,371, 5,531,940, 5,702,819, and 5,793,465 incorporated herein in their entireties by reference.
- the added layer or layers of distance power may be of a total thickness of less than about 1 mm, preferably less than about 0.25 mm, more preferably less than about 0.1 mm.
- the point for measuring the thickness of the layer or layers varies depending on whether the lens is a plus or minus lens.
- plus lens is meant that the lens is thicker in the center than at its edges and by “minus lens” is meant that the lens is thinner at its center than at its edges.
- the appropriate point to measure the thickness of the added layer will be at the center of the lens.
- the point for measuring thickness will be at the lens edge.
- a polycarbonate preform is formed by injection molding.
- preform 1 has a concave surface 2 base curvature of -5.50 diopters and a convex surface 3 base curvature of 5.50 diopters resulting in a preform distance power of 0 diopters.
- a layer 4 is surface cast onto preform 1, the cast layer 4 having a curvature of 3.00 diopters in the distance zone 5 and a 5.00 diopters curvature in the add, or near vision, zone 6 and a zone of transition power 7 between the distance and add zones.
- the resulting lens 10 has a distance power of -2.50 diopters and a dioptric add power of +2.00.
- Example 2 the procedure of Example 1 is followed except that preform concave surface 8 additionally has a -2.00 diopters cylinder power at 180° and a 7.50 diopters cylinder curvature 9.
- the added layer 11 is the same as for Example 1, the resulting lens 20 having a distance power of -2.50 diopters with -2.00 diopters of cylinder and a dioptric add power of +2.00.
- Example 3 Referring to FIG. 3, the procedure of Example 1 is used except that the preform 12 has a distance power of -3.00 diopters.
- Preform 12 has a -7.00 diopters concave surface 13 and a 4.00 diopters convex surface 14 resulting in a distance power of -3.00 diopters.
- the distance power of the added layer 15 is -3.00 diopters with a dioptric add power of +2.00.
- the resulting lens 30 has a distance power of- 6.00 diopters and a dioptric add power of +2.00.
- Example 3 the procedure of Example 3 is used except that preform 17 has a distance power of +3.50 diopters resulting from a -2.50 concave and +6.00 diopters convex surface distance curvatures.
- Added layer 18 has a distance power of +2.50 diopters with a dioptric add power of +2.00.
- the resulting lens 40 has a distance power of +6.00 diopters and a dioptric add power of +2.00.
- Example 5 Referring to FIG. 5, a polycarbonate preform is injection molded.
- Preform 19 has a -5.50 diopters concave surface 21 distance curvature with a - 4.50 diopters add zone 22 and a transition power zone 23.
- Convex surface 24 has 5.50 diopters distance power resulting in a first distance power of 0 diopters and a dioptric add power of 1.00.
- Added layer 25 is surface cast onto preform 19.
- Layer 25 has a distance zone 26 curvature of 3.00 diopters and a 4.00 diopters curvature in add zone 27.
- the resulting lens 50 has a distance power of -2.50 diopters and a dioptric add power of +2.00.
- Example 6 A polycarbonate preform, having a refractive index of 1.59, is injection molded.
- preform 29 has a dioptric add power spilt between the convex and concave surfaces and distance power of +4.50 diopters.
- Concave surface 31 also has a dioptric add power of 1.50 diopters and convex surface 32 has a dioptric add power of 1.75.
- Added layer 33 is cast onto preform 29. The index of refraction for layer 33 is 1.50.
- the dioptric add power of the finished lens 60 is +2.00, the result of a +1.75 diopters contribution from convex surface 32 and a +1.50/6, or +0.25, diopters contribution from concave surface 31 when combined with layer 33.
- Layer 33 has a distance power of +1.50 diopters.
- the resulting lens 60 has a distance power of +6.00 diopters and a dioptric add power of +2.00 diopters.
Abstract
L'invention concerne des procédés de production d'une gamme complète de verres correcteurs de lunettes, consistant à minimiser le nombre de préformes et moules optiques, nécessaires à la production de ces verres. Dans le procédé de l'invention, on répartit la puissance du verre pour vision de loin, entre une ou des couches ajoutée(s) et une préforme optique, afin de réduire le nombre de préformes et/moules, nécessaires à la production de verres.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU57267/00A AU5726700A (en) | 1999-09-06 | 2000-06-05 | Method of manufacturing spectacle lenses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23862999A | 1999-09-06 | 1999-09-06 | |
US09/238,62919990906 | 1999-09-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001018590A2 true WO2001018590A2 (fr) | 2001-03-15 |
Family
ID=22898685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/015470 WO2001018590A2 (fr) | 1999-09-06 | 2000-06-05 | Procede de nettoyage d'articles |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU5726700A (fr) |
WO (1) | WO2001018590A2 (fr) |
-
2000
- 2000-06-05 AU AU57267/00A patent/AU5726700A/en not_active Withdrawn
- 2000-06-05 WO PCT/US2000/015470 patent/WO2001018590A2/fr not_active Application Discontinuation
Also Published As
Publication number | Publication date |
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AU5726700A (en) | 2001-04-10 |
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