EP2024765A1 - Disk for modification of the power of an optical component - Google Patents

Disk for modification of the power of an optical component

Info

Publication number
EP2024765A1
EP2024765A1 EP07766108A EP07766108A EP2024765A1 EP 2024765 A1 EP2024765 A1 EP 2024765A1 EP 07766108 A EP07766108 A EP 07766108A EP 07766108 A EP07766108 A EP 07766108A EP 2024765 A1 EP2024765 A1 EP 2024765A1
Authority
EP
European Patent Office
Prior art keywords
pellet
height
jumps
lens
optical
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Withdrawn
Application number
EP07766108A
Other languages
German (de)
French (fr)
Inventor
Bruno Fermigier
François GUILHAUMON
Matthieu Koscher
Sylvie MAZÉ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP2024765A1 publication Critical patent/EP2024765A1/en
Withdrawn legal-status Critical Current

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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/16—Laminated or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/20—Diffractive and Fresnel lenses or lens portions

Definitions

  • the present invention relates to a patch for attachment to a face of an optical component to modify an optical power thereof. It also relates to an optical element and a pair of glasses that incorporate such a pellet, as well as a method of manufacturing the pellet. It may be useful to adapt the power of an optical component according to a particular use thereof. This may be the case, for example, to adapt a glass of sun protection glasses to the ametropia of a carrier of this glass.
  • the power of an optical component refers to the vergence of this element, and is commonly expressed in diopters.
  • the pellet includes a Fresnel lens which is formed of a series of Fresnel zones disposed one inside the other parallel to a smooth face of the pellet. These zones have jumps in height between two successive zones that are greater than five times an average wavelength of visible light, the jumps in height being measured in a direction perpendicular to the tangent of the smooth face.
  • the pellet itself has an optical power which results from the refraction of the light rays on both sides of the pellet in each Fresnel zone. This optical power of the chip is added to that of the optical component to which it is applied.
  • the use of a Fresnel lens shape reduces the thickness of the pad to achieve a fixed power change, compared to an additional lens that would be contiguous to the optical component.
  • pellets have an initial planar shape, and must be curved when applied to the curved surface of an ophthalmic lens or lens.
  • This deformation of the pellet at the moment of its application to the lens or to the ophthalmic lens creates distortions of an image formed through the lens or glass, once the lens or glass is provided with the wafer, as well as optical aberrations.
  • Such defects are particularly troublesome for ophthalmic application, since an object then appears with variable deformation when viewed through different locations of the glass.
  • the distortions of the image vary dynamically when the observed object moves in the field of view or when the wearer of the glass turns his head following the object of the gaze. These image distortions are very troublesome.
  • these defects are all the more important as the optical power change provided by the chip is high.
  • the existing pellets are designed to be applied to a glass by turning the face of the pellets opposite the glass which has the jumps in height.
  • the smooth face of each pellet which is located on the side opposite to the jumps in height, allows adhesion of the pellet on the glass by capillarity or electrostatic effect.
  • the face of the pellet which is exposed to soiling is then that which comprises jumps height. But it can not be cleaned simply because of its relief, and soil deposits that form in high jumps cause significant light diffusion. They also greatly degrade the quality of an image formed through the glass provided with the pellet, by locally deforming the wavefront light.
  • a diffractive optical lens comprising a lower surface having an aspheric curve and an upper surface having a quasi-parabolic curve, said upper surface further including a plurality of diffractive streaks. These diffractive stripes are shaped in accordance with a Fresnel diffraction formula.
  • the optical lenses as described are intended to be used as instrumental lenses, such as lenses that can be found in electronic devices such as cameras, projectors, or scanners. These optical lenses constitute diffractive optical elements. Such lenses can not be used in ophthalmic optics because of their design. Indeed a diffractive lens brings chromaticism, this one being more and more important with the corrective power which one creates at the level of the lens. As a result, the use of a diffractive lens as described in this patent application is not capable of providing a solution to the technical problem of the present invention.
  • An object of the present invention is to provide an optical power modification patch that does not have the disadvantages mentioned above.
  • the invention provides a pellet of the type described above, and which is intended to be fixed on a curved surface of an optical component to modify the power thereof.
  • modifying means either the contribution of an optical power to an optical component not comprising power, or a variation of the optical power to an optical component already comprising its own optical power.
  • the pellet has a generally convex shape in addition to the jumps in height that are present between the Fresnel zones.
  • the smooth face of the pellet has an initial curvature which corresponds substantially to the shape of the curved surface of the optical component intended to receive said pellet.
  • the face of the pellet which includes the jumps in height also has a mean curvature which also corresponds to said curved surface of the optical component. It is this face of the pellet which includes the jumps in height which is intended to be brought into contact with the curved surface of the optical component.
  • An optical power modification patch according to the invention is therefore not flat, but has a generally convex shape, for example substantially spherical, in addition to jumps in height.
  • the pellet With this initial curved shape, the pellet is only slightly deformed, or not deformed, when it is applied to the surface of an optical component which is itself substantially curved. The pellet then creates little or no image distortion, or optical aberration, when an object is observed through the optical component provided with the pellet.
  • the comfort of use of the optical component is not degraded by the chip, even for a chip that makes a significant optical power change that may be greater than 30 diopters in absolute value at the level of the chip in itself. even.
  • optical component means visors such as helmet visors and ophthalmic lenses.
  • visors such as helmet visors and ophthalmic lenses.
  • optical lenses means lenses adapted in particular to a spectacle frame or to a mask such as a ski mask or a diving mask, as well as masks whose function is to protect the eye and / or correcting the view, these lenses being chosen from afocal, unifocal, bifocal or progressive addition lenses.
  • mask such as solar masks, is meant a lens consisting of a single piece and intended to be positioned in front of both eyes. Such ophthalmic lenses or visors may be optionally tinted.
  • optical components within the meaning of the invention may optionally have one or more functions that do not provide the application of one or more coatings and may especially be chosen from photochromic, anti-reflective, anti-fouling, anti-shock and anti-scratch coatings. , polarizing and antistatic.
  • the invention is particularly suitable for corrective or non-corrective ophthalmic lenses.
  • the jumps in height between successive Fresnel zones are located on a generally convex face of the pellet.
  • the face of the pellet which is exposed to soiling is that which is smooth. It can therefore be easily cleaned.
  • the face of the pellet which includes the jumps in height is then protected from dirt by the lens against which it is applied.
  • the modification of the optical power that is provided by the pellet is then permanent, and is not affected by dirt deposits.
  • the average radius of curvature of the pellet is between 135 mm (millimeters) and 53 mm.
  • Such a radius of curvature corresponds to the shape of the posterior face, or concave face, of many spectacle lenses.
  • the jumps in height between successive Fresnel zones have substantially constant amplitudes within a circle of 10 mm radius surrounding the optical center of the patch.
  • the face of the pellet which includes the jumps in height then has a constant height of reliefs in a central part of this face. This further contributes to ensuring that no image distortion or optical aberration is caused by the chip when it is applied against an optical component on the side of the jumps height.
  • the invention also comprises a patch in which the jumps in height between successive Fresnel zones have substantially constant amplitudes over the entire surface of said patch.
  • the invention thus comprises the different possible combinations between jumps of variable height between Fresnel zone and jump of constant height between constant Fresnel zone on all or part of the surface of the patch.
  • the invention also relates to an optical element which comprises a basic optical component and a patch as described above, fixed on the component.
  • the face of the pellet which has the jumps in height is turned towards the base component within the optical element, to protect this face against soiling.
  • the pellet may be attached to the component by a layer of material having adhesive properties capable of providing permanent cohesion between said pellet and said optical component.
  • the basic optical component may be an ophthalmic lens.
  • an ophthalmic lens is tinted or partially reflective and optionally has optical properties capable of correcting an ametropia.
  • the pellet is then little visible and does not reduce the aesthetics of a pair of glasses that includes the lens, when applied to the concave or posterior face of the lens.
  • the invention also relates to a pair of spectacles which comprises minus a lens and a pellet as described above, which is fixed on the lens.
  • the pellet is fixed on the posterior surface of the lens.
  • Such a pair of spectacles may be of the type of ametropia corrective glasses, tinted or not, or glasses or non-corrective sun protection mask, in particular.
  • the invention finally relates to a method of manufacturing an optical power modification pad as described above, from a thermoplastic material.
  • FIG. 1a is a perspective view of a pellet according to the invention.
  • FIG. 1b and 1c are respective sectional views of two pellets according to the invention
  • FIG. 2a and 2b are sectional views of two ophthalmic lenses, adapted to be adapted to a pair of glasses, provided with pellets according to Figures 1b and 1c;
  • FIG. 3 is a diagram illustrating variations in height jumps for a tablet according to the invention.
  • FIG. 4 illustrates a convention for measuring a wetting angle;
  • FIG. 5 schematically illustrates the principle of manufacture of a pellet according to the invention.
  • a tablet 1 according to the invention has a generally domed shape, or cup.
  • the pellet has a spherical cap shape, with an average radius of curvature which may be of the order of 66 mm (millimeters) for example. This radius of mean curvature is advantageously between 88 mm and 53 mm
  • the pellet 1 constitutes a Fresnel lens: it is formed of a succession of Fresnel zones which are concentrically arranged contiguously, for example 100 to 200 zones. These zones, referenced 2 in the figures are coaxial crowns which are oriented and centered along an optical axis marked z. The z axis then passes through an optical center of the pellet, which is located thereon and is denoted by O.
  • each Fresnel zone corresponds to a lens portion, and the thickness of the pellet 1 varies. continuously within this zone in a radial direction, denoted r, in a plane perpendicular to the z axis.
  • one of the surfaces of the pellet 1 has a height jump parallel to the z axis, referenced 3. Its amplitude is noted ⁇ z. It is specified that the jumps in height 3 which are present between successive zones 2 are superimposed on the general shape of the pellet 1, this general shape being curved, possibly approximately spherical, according to the invention.
  • the jumps of height 3 correspond to discontinuities in height of the convex face of the pellet 1, referenced Sl
  • a Fresnel zone 2 has a radial dimension which is denoted ⁇ r, measured perpendicularly to the z axis.
  • the concave face of the pellet 1, referenced S2 is then smooth, e denotes the average thickness of the pellet 1, between the faces S1 and S2. It is measured perpendicular to the S2 face.
  • the thickness e is less than 2 mm and may be between 0.5 and 0.7 mm. The increase in weight of an optical element comprising the patch 1, which is due to the latter, is then limited.
  • the Fresnel zones 2 are dimensioned so that the amplitudes ⁇ z of the jumps of height 3 are at least equal to five times one. average wavelength of visible light.
  • the amplitudes of the jumps in height 3 can be between 5 microns (micrometers) and 250 microns. In this way, because of the short length of coherence of the light Naturally, no interference is perceptible that would occur between portions of a light beam that pass through different areas.
  • the pellet 1 has a purely refractive optical effect, which is related to the shape of the surfaces S1 and S2 in each zone 2, and produces no visible diffractive effect.
  • the amplitudes of the jumps in height 3 between successive Fresnel zones may be variable over at least a portion of the surface of the patch while maintaining a substantially spherical profile on the surface (S1). In this case, the amplitude ⁇ z is greater at the periphery of the pellet than in its central zone.
  • the amplitude of these jumps can be between 5 microns and 250 microns; in the case where the jumps in height between successive Fresnel zones are constant over the entire surface (S1) then they may be between 5 microns and 100 microns; and in the case where the jumps in height between successive Fresnel zones have substantially constant amplitudes within a circle (C) of 10 mm radius surrounding the optical center of the patch (O), the amplitude in of a circle (C) may be between 5 ⁇ m and 50 ⁇ m, and the variable amplitude of the height jumps outside this circle (C) to a peripheral part of the lens may be between 5 ⁇ m and 250 ⁇ m.
  • the radial dimension ⁇ r of each zone 2 then depends on the optical power of the pellet 1 and the amplitude ⁇ z of the height jumps 3. In the preceding conditions, and for an optical power of the pellet 1 less than 12 diopters, ⁇ r may be between 10 ⁇ m and 2 mm.
  • the pellet 1 may have a positive or negative vergence, depending on the direction of variation of its thickness in the direction r, within each Fresnel zone 2.
  • FIGS. 1b and 1c respectively correspond to a convergent or divergent pellet .
  • the variation of the thickness of the pellet inside each zone 2 may be, in particular, a quadratic function of r.
  • FIGS. 2a and 2b show two ophthalmic lenses that are adaptable to a pair of spectacles that are provided, on their posterior faces SO, or concave faces, pellets according to Figures 1b and 1c, respectively. It is understood that each of these pellets can be used in the same way with the lens of the other figure, and that the combinations illustrated are only taken as examples.
  • the lens of FIG. 2a, referenced 10 may be a sun protection lens with zero optical power, since it has two parallel faces.
  • the pellet 1 then gives it a non-zero power, which makes it possible to correct an ametropic defect of a wearer of the lens. In this way, the patch 1 makes it possible to adapt any sun protection lens to a carrier having an ametropia.
  • the pair of spectacles comprising such a lens 10 may then be chosen by the wearer according to his aesthetics, his color, or the shape of the associated frame.
  • the lens of Figure 2b, referenced 11, corresponds to a correction of myopia, since it is thinner at its center than at its periphery.
  • the patch 1 then makes it possible to adapt the strength of the correction as a function of the degree of myopia of the wearer.
  • the pellet 1 is placed on the glass 11 so as to superpose the respective optical axes of the glass and the pellet. An identical function is obtained with a corrective lens of hyperopia.
  • the pellet 1 is applied to the posterior surface SO of the lens 10 or 11, which is smooth. This operation can be done directly by the practitioner on the pair of glasses in which the lens is mounted on the frame chosen by the wearer.
  • the jumps of height 3 preferably have substantially constant amplitudes within a circle C of radius R c surrounding the center O. In this way, the pellet 1 can be applied more easily against the surface SO of the lens, at least in a central zone of the pellet, inside the circle C.
  • FIG. 3 represents an example of variation of the amplitudes ⁇ z of the jumps of height 3 in the radial direction r.
  • the amplitudes ⁇ z of the jumps 3 are constant and the radial dimension ⁇ r of the zones 2 decreases for zones 2 of larger and larger.
  • the jumps of height 3 may have amplitudes ⁇ z which increase, in particular to avoid making areas 2 which would have radial dimensions ⁇ r very short.
  • R c may be equal to 10 mm, for example, and the amplitudes ⁇ z of the jumps of height 3 may be equal to 40 ⁇ m inside circle C.
  • the wafer 1 is adhered to the SO face of the lens 10 or 11, with a layer of adhesive material 20 disposed between the wafer 1 and the lens.
  • the adhesive material 20 which is used advantageously has, in the liquid state, a wetting angle on the pellet 1 which is less than 90 °.
  • FIG. 4 illustrates the convention adopted here for measuring the wetting angle ⁇ of the adhesive material 20 on the material of the wafer 1. Under these conditions, the adhesive material 20 penetrates to the bottom of the jumps of height 3 without retaining of air bubble.
  • Several types of adhesive material may be used, in particular a radiation-polymerizable or thermal-curing adhesive or latex-type adhesive. Particularly successful embodiments of the invention have been obtained with an acrylate-based glue and polymerizable by UV irradiation.
  • Respective values substantially equal to 1, 59 and 1, 50 for the material of the pellet 1 and for the adhesive material 20 have made it possible to obtain optical power changes greater than 6 diopters, in absolute values, or even greater than 12 diopters .
  • the lens 10 or 11 may be made of any material commonly used in the ophthalmic industry, to correct an ametropia or to achieve sun protection.
  • the material of the ophthalmic lens can thus be of mineral or organic type. As an indication but not limiting, mention may be made as organic material that can be used in the context of the invention the materials conventionally used in optics and ophthalmia.
  • substrates of the polycarbonate type are suitable; polyamide; polyimides; polysulfones; copolymers of poly (ethylene terephthalate) and polycarbonate; polyolefins, especially polynorbomene; polymers and copolymers of diethylene glycol bis (allyl carbonate); (meth) acrylic polymers and copolymers, especially polymers and (meth) acrylic copolymers derived from bisphenol-A; thio (meth) acrylic polymers and copolymers; urethane and thiourethane polymers and copolymers; Epoxy polymers and copolymers and polymers and copolymers episulfide.
  • a pellet according to the invention may advantageously be produced by injection of a transparent thermoplastic material, for example based on polycarbonate, into an injection mold.
  • the mold is fed, in a manner known per se, by a device for compressing and injecting the material, which comprises a compression screw and a heating device.
  • Figure 5 schematically illustrates such a mold 100.
  • Two inserts, referenced 101 and 102 are placed in the mold.
  • the insert 101 defines the face S1 of the pellet 1 which comprises the jumps in height, and the insert 102 defines the smooth face S2. They are arranged vis-à-vis and separated by a space 103 which corresponds to the pellet 1.
  • the thermoplastic material is then injected into the mold 100 by an injection nozzle 104, so as to fill the space 103.
  • the pellet 1 can be recovered.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Health & Medical Sciences (AREA)
  • Eyeglasses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

A disk enabling modification of the power of an optical component consists of a Fresnel lens. The disk is initially formed with a general rounded shape which corresponds to the shape of the optical component. In this way, the disk does not lose its shape or does not lose it very much when it is applied against the component. It does not cause image distortion or optical aberration when an object is observed through the component provided with the disk. Such a disk is particularly adapted to obtain correction of ametropia or to a solar mask initially lacking optical power.

Description

PASTILLE DE MODIFICATION D'UNE PUISSANCE D'UN COMPOSANT PASTILLE FOR MODIFYING A POWER OF A COMPONENT
OPTIQUEOPTICAL
La présente invention concerne une pastille destinée à être fixée sur une face d'un composant optique pour modifier une puissance optique de celui- ci. Elle concerne aussi un élément optique et une paire de lunettes qui incorporent une telle pastille, ainsi qu'un procédé de fabrication de la pastille. II peut être utile d'adapter la puissance d'un composant optique en fonction d'une utilisation particulière de celui-ci. Ce peut être le cas, par exemple, pour adapter un verre de lunettes de protection solaire à l'amétropie d'un porteur de ce verre. Dans le cadre de l'invention, la puissance d'un composant optique désigne la vergence de cet élément, et est couramment exprimée en dioptries.The present invention relates to a patch for attachment to a face of an optical component to modify an optical power thereof. It also relates to an optical element and a pair of glasses that incorporate such a pellet, as well as a method of manufacturing the pellet. It may be useful to adapt the power of an optical component according to a particular use thereof. This may be the case, for example, to adapt a glass of sun protection glasses to the ametropia of a carrier of this glass. In the context of the invention, the power of an optical component refers to the vergence of this element, and is commonly expressed in diopters.
Il est connu de réaliser une pastille en matériau transparent qui est destinée à être appliquée sur une face d'un composant optique, pour modifier la puissance de ce dernier. La pastille comprend une lentille de Fresnel qui est formée d'une série de zones de Fresnel disposées les unes à l'intérieur des autres parallèlement à une face lisse de la pastille. Ces zones présentent des sauts de hauteur entre deux zones successives qui sont plus grands que cinq fois une longueur d'onde moyenne de lumière visible, les sauts de hauteur étant mesurés selon une direction perpendiculaire à la tangente de la face lisse. Dans ces conditions, la pastille possède elle-même une puissance optique qui résulte de la réfraction des rayons lumineux sur les deux faces de la pastille dans chaque zone de Fresnel. Cette puissance optique de la pastille s'ajoute à celle du composant optique sur lequel elle est appliquée. L'utilisation d'une forme de lentille de Fresnel réduit l'épaisseur de la pastille pour obtenir une modification de puissance fixée, par rapport à une lentille additionnelle qui serait accolée au composant optique.It is known to make a pellet of transparent material which is intended to be applied on one side of an optical component, to modify the power of the latter. The pellet includes a Fresnel lens which is formed of a series of Fresnel zones disposed one inside the other parallel to a smooth face of the pellet. These zones have jumps in height between two successive zones that are greater than five times an average wavelength of visible light, the jumps in height being measured in a direction perpendicular to the tangent of the smooth face. Under these conditions, the pellet itself has an optical power which results from the refraction of the light rays on both sides of the pellet in each Fresnel zone. This optical power of the chip is added to that of the optical component to which it is applied. The use of a Fresnel lens shape reduces the thickness of the pad to achieve a fixed power change, compared to an additional lens that would be contiguous to the optical component.
Ces pastilles possèdent une forme initiale plane, et doivent être courbées lorsqu'elles sont appliquées sur la surface courbe d'une lentille ou d'un verre ophtalmique. Cette déformation de la pastille au moment de son application sur la lentille ou sur le verre ophtalmique crée des distorsions d'une image formée à travers la lentille ou le verre, une fois que celle-ci ou celui-ci est muni(e) de la pastille, ainsi que des aberrations optiques. De tels défauts sont particulièrement gênants pour une application ophtalmique, puisque qu'un objet apparaît alors avec une déformation variable lorsqu'il est observé à travers des endroits différents du verre. En particulier, les distorsions de l'image varient dynamiquement lorsque l'objet observé se déplace dans le champ de vision ou lorsque le porteur du verre tourne la tête en suivant l'objet du regard. Ces distorsions d'image sont alors très gênantes. Enfin, ces défauts sont d'autant plus importants que la modification de puissance optique apportée par la pastille est élevée.These pellets have an initial planar shape, and must be curved when applied to the curved surface of an ophthalmic lens or lens. This deformation of the pellet at the moment of its application to the lens or to the ophthalmic lens creates distortions of an image formed through the lens or glass, once the lens or glass is provided with the wafer, as well as optical aberrations. Such defects are particularly troublesome for ophthalmic application, since an object then appears with variable deformation when viewed through different locations of the glass. In particular, the distortions of the image vary dynamically when the observed object moves in the field of view or when the wearer of the glass turns his head following the object of the gaze. These image distortions are very troublesome. Finally, these defects are all the more important as the optical power change provided by the chip is high.
En outre, les pastilles existantes sont conçues pour être appliquées sur un verre en tournant à l'opposé du verre la face des pastilles qui comporte les sauts de hauteur. En effet, la face lisse de chaque pastille, qui est située du côté opposé aux sauts de hauteur, permet une adhésion de la pastille sur le verre par capillarité ou par effet électrostatique. La face de la pastille qui est exposée aux salissures est alors celle qui comporte les sauts de hauteur. Or celle-ci ne peut pas être nettoyée simplement à cause de son relief, et les dépôts de salissure qui se forment dans les sauts de hauteur provoquent une diffusion lumineuse importante. Ils dégradent aussi fortement la qualité d'une image formée à travers le verre muni de la pastille, en déformant localement le front d'onde lumineux.In addition, the existing pellets are designed to be applied to a glass by turning the face of the pellets opposite the glass which has the jumps in height. Indeed, the smooth face of each pellet, which is located on the side opposite to the jumps in height, allows adhesion of the pellet on the glass by capillarity or electrostatic effect. The face of the pellet which is exposed to soiling is then that which comprises jumps height. But it can not be cleaned simply because of its relief, and soil deposits that form in high jumps cause significant light diffusion. They also greatly degrade the quality of an image formed through the glass provided with the pellet, by locally deforming the wavefront light.
Il est également connu du document US 2006/0109554, une lentille optique diffractive comprenant une surface inférieure ayant une courbe asphérique et une surface supérieure ayant une courbe quasi-parabolique, ladite surface supérieure incluant en plus une pluralité de rayures diffractives. Ces rayures diffractives sont façonnées en accord avec une formule de diffraction de Fresnel. Les lentilles optiques telles que décrites sont destinées à être utilisées en tant que lentilles instrumentales, du type des lentilles que l'on peut trouver dans des appareils électroniques tels que les caméras, les projecteurs, ou bien les scanners. Ces lentilles optiques constituent des éléments optiques diffractifs. De telles lentilles ne peuvent trouver un usage en optique ophtalmique, du fait de leur conception. En effet une lentille diffractive apporte du chromatisme, celui-ci étant de plus en plus important avec la puissance corrective que l'on crée au niveau de la lentille. De ce fait l'utilisation de lentille diffractive telle que décrite dans cette demande de brevet n'est pas apte à fournir une solution au problème technique de la présente invention. Un but de la présente invention est de proposer une pastille de modification de puissance optique qui ne présente pas les inconvénients cités ci-dessus.It is also known from US 2006/0109554, a diffractive optical lens comprising a lower surface having an aspheric curve and an upper surface having a quasi-parabolic curve, said upper surface further including a plurality of diffractive streaks. These diffractive stripes are shaped in accordance with a Fresnel diffraction formula. The optical lenses as described are intended to be used as instrumental lenses, such as lenses that can be found in electronic devices such as cameras, projectors, or scanners. These optical lenses constitute diffractive optical elements. Such lenses can not be used in ophthalmic optics because of their design. Indeed a diffractive lens brings chromaticism, this one being more and more important with the corrective power which one creates at the level of the lens. As a result, the use of a diffractive lens as described in this patent application is not capable of providing a solution to the technical problem of the present invention. An object of the present invention is to provide an optical power modification patch that does not have the disadvantages mentioned above.
Pour cela, l'invention propose une pastille du type décrit ci-dessus, et qui est destinée à être fixée sur une surface courbe d'un composant optique pour modifier la puissance de celui-ci. Par modifier on entend soit l'apport d'une puissance optique à un composant optique ne comprenant pas de puissance, soit une variation de la puissance optique à un composant optique comprenant déjà sa propre puissance optique. Selon l'invention, la pastille possède une forme généralement bombée en plus des sauts de hauteur qui sont présents entre les zones de Fresnel. Autrement dit, la face lisse de la pastille possède une courbure initiale qui correspond sensiblement à la forme de la surface courbe du composant optique destiné à recevoir ladite pastille. La face de la pastille qui comporte les sauts de hauteur possède également une courbure moyenne qui correspond aussi à ladite surface courbe du composant optique. C'est cette face de la pastille qui comprend les sauts de hauteur qui est destinée à être mise en contact avec la surface courbe du composant optique.For this, the invention provides a pellet of the type described above, and which is intended to be fixed on a curved surface of an optical component to modify the power thereof. By modifying means either the contribution of an optical power to an optical component not comprising power, or a variation of the optical power to an optical component already comprising its own optical power. According to the invention, the pellet has a generally convex shape in addition to the jumps in height that are present between the Fresnel zones. In other words, the smooth face of the pellet has an initial curvature which corresponds substantially to the shape of the curved surface of the optical component intended to receive said pellet. The face of the pellet which includes the jumps in height also has a mean curvature which also corresponds to said curved surface of the optical component. It is this face of the pellet which includes the jumps in height which is intended to be brought into contact with the curved surface of the optical component.
Une pastille de modification de puissance optique selon l'invention n'est donc pas plane, mais présente une forme générale bombée, par exemple sensiblement sphérique, en plus des sauts de hauteur. Grâce à cette forme initiale bombée, la pastille n'est que peu déformée, ou pas déformée, lorsqu'elle est appliquée sur la surface d'un composant optique qui est lui- même sensiblement bombé. La pastille crée alors peu ou aucune distorsion d'image, ni aberration optique, lorsqu'un objet est observé à travers le composant optique muni de la pastille. Le confort d'utilisation du composant optique n'est alors pas dégradé par la pastille, même pour une pastille qui réalise une modification de puissance optique importante pouvant être supérieure à 30 dioptries en valeur absolue au niveau de la pastille en elle- même.An optical power modification patch according to the invention is therefore not flat, but has a generally convex shape, for example substantially spherical, in addition to jumps in height. With this initial curved shape, the pellet is only slightly deformed, or not deformed, when it is applied to the surface of an optical component which is itself substantially curved. The pellet then creates little or no image distortion, or optical aberration, when an object is observed through the optical component provided with the pellet. The comfort of use of the optical component is not degraded by the chip, even for a chip that makes a significant optical power change that may be greater than 30 diopters in absolute value at the level of the chip in itself. even.
Au sens de l'invention on entend par composant optique les visières telles que les visières de casque et les lentilles ophtalmiques. Par lentilles ophtalmiques, on entend les lentilles s'adaptant notamment à une monture de lunette ou à un masque tel qu'un masque de ski ou un masque de plongée, ainsi que les masques ayant pour fonction de protéger l'œil et/ou de corriger la vue, ces lentilles étant choisies parmi les lentilles afocales, unifocales, bifocale ou à addition progressive. Par masque, tel que les masques solaires, on entend une lentille constituée d'une seule pièce et destinée à être positionnée devant les deux yeux. De telles lentilles ophtalmiques ou visières peuvent être éventuellement teintées. Ces composants optiques au sens de l'invention peuvent optionnellement présenter une ou plusieurs fonctions apporter pas l'application d'un ou plusieurs revêtements et pouvant notamment être choisi parmi les revêtements photochromiques, anti-reflets, antisalissures, anti-chocs, anti-rayures, polarisants et antistatiques. L'invention est particulièrement adaptée aux lentilles ophtalmiques correctrices ou non correctrices.For the purposes of the invention, the term "optical component" means visors such as helmet visors and ophthalmic lenses. "Ophthalmic lenses" means lenses adapted in particular to a spectacle frame or to a mask such as a ski mask or a diving mask, as well as masks whose function is to protect the eye and / or correcting the view, these lenses being chosen from afocal, unifocal, bifocal or progressive addition lenses. By mask, such as solar masks, is meant a lens consisting of a single piece and intended to be positioned in front of both eyes. Such ophthalmic lenses or visors may be optionally tinted. These optical components within the meaning of the invention may optionally have one or more functions that do not provide the application of one or more coatings and may especially be chosen from photochromic, anti-reflective, anti-fouling, anti-shock and anti-scratch coatings. , polarizing and antistatic. The invention is particularly suitable for corrective or non-corrective ophthalmic lenses.
Selon une caractéristique supplémentaire de l'invention, les sauts de hauteur entre zones de Fresnel successives sont situés sur une face généralement convexe de la pastille. Lorsqu'une telle pastille est appliquée contre la face postérieure, ou concave, d'une lentille ophtalmique, la face de la pastille qui est exposée aux salissures est celle qui est lisse. Elle peut donc être facilement nettoyée. La face de la pastille qui comporte les sauts de hauteur est alors protégée des salissures par la lentille contre lequel elle est appliquée. La modification de la puissance optique qui est apportée par la pastille est alors permanente, et n'est pas altérée par des dépôts de salissure. L'utilisateur de lunettes ou de masque comprenant de telles lentilles ophtalmiques munies de cette pastille en appréciera immédiatement l'avantage pratique dans sa vie quotidienne.According to a further characteristic of the invention, the jumps in height between successive Fresnel zones are located on a generally convex face of the pellet. When such a pellet is applied against the posterior or concave face of an ophthalmic lens, the face of the pellet which is exposed to soiling is that which is smooth. It can therefore be easily cleaned. The face of the pellet which includes the jumps in height is then protected from dirt by the lens against which it is applied. The modification of the optical power that is provided by the pellet is then permanent, and is not affected by dirt deposits. The user of glasses or masks comprising such ophthalmic lenses provided with this tablet will immediately appreciate the practical advantage in his daily life.
Selon encore une autre caractéristique de l'invention, le rayon de courbure moyen de la pastille est compris entre 135 mm (millimètres) et 53 mm. Un tel rayon de courbure correspond à la forme de la face postérieure, ou face concave, de nombreuses lentilles de lunettes. Selon une amélioration de l'invention, les sauts de hauteur entre zones de Fresnel successives ont des amplitudes sensiblement constantes à l'intérieur d'un cercle de 10 mm de rayon entourant le centre optique de la pastille. La face de la pastille qui comporte les sauts de hauteur présente alors une hauteur de reliefs constante dans une partie centrale de cette face. Ceci contribue encore à assurer qu'aucune distorsion d'image ni aberration optique ne soit provoquée par la pastille lorsque celle-ci est appliquée contre un composant optique du côté des sauts de hauteur. L'invention comprend également une pastille dans laquelle les sauts de hauteur entre zones de Fresnel successives ont des amplitudes sensiblement constantes sur toute la surface de ladite pastille. L'invention comprend ainsi les différentes combinaisons possibles entre saut de hauteur variable entre zone de Fresnel et saut de hauteur constant entre constant zone de Fresnel sur tout ou partie de la surface de la pastille. L'invention concerne aussi un élément optique qui comprend un composant optique de base et une pastille telle que décrite précédemment, fixée sur le composant. De préférence, la face de la pastille qui comporte les sauts de hauteur est tournée vers le composant de base au sein de l'élément optique, afin de protéger cette face contre des salissures. En particulier, la pastille peut être fixée sur le composant par une couche de matériau présentant des propriétés adhésives aptes à apporter une cohésion permanente entre ladite pastille et ledit composant optique. Cette couche de matériau est alors disposée entre les deux entités constituant l'élément optique. Comme décrit précédemment le composant optique de base peut être une lentille ophtalmique. De préférence, une telle lentille ophtalmique est teintée ou partiellement réfléchissante et présente éventuellement des propriétés optiques aptes à corriger une amétropie. La pastille est alors peu visible et ne réduit pas l'esthétisme d'une paire de lunettes qui comprend la lentille, lorsqu'elle est appliquée sur la face concave, ou face postérieure, de la lentille.According to yet another characteristic of the invention, the average radius of curvature of the pellet is between 135 mm (millimeters) and 53 mm. Such a radius of curvature corresponds to the shape of the posterior face, or concave face, of many spectacle lenses. According to an improvement of the invention, the jumps in height between successive Fresnel zones have substantially constant amplitudes within a circle of 10 mm radius surrounding the optical center of the patch. The face of the pellet which includes the jumps in height then has a constant height of reliefs in a central part of this face. This further contributes to ensuring that no image distortion or optical aberration is caused by the chip when it is applied against an optical component on the side of the jumps height. The invention also comprises a patch in which the jumps in height between successive Fresnel zones have substantially constant amplitudes over the entire surface of said patch. The invention thus comprises the different possible combinations between jumps of variable height between Fresnel zone and jump of constant height between constant Fresnel zone on all or part of the surface of the patch. The invention also relates to an optical element which comprises a basic optical component and a patch as described above, fixed on the component. Preferably, the face of the pellet which has the jumps in height is turned towards the base component within the optical element, to protect this face against soiling. In particular, the pellet may be attached to the component by a layer of material having adhesive properties capable of providing permanent cohesion between said pellet and said optical component. This layer of material is then disposed between the two entities constituting the optical element. As previously described, the basic optical component may be an ophthalmic lens. Preferably, such an ophthalmic lens is tinted or partially reflective and optionally has optical properties capable of correcting an ametropia. The pellet is then little visible and does not reduce the aesthetics of a pair of glasses that includes the lens, when applied to the concave or posterior face of the lens.
L'invention concerne aussi une paire de lunettes qui comprend au moins une lentille et une pastille telle que décrite précédemment, qui est fixée sur la lentille. De préférence, la pastille est fixée sur la face postérieure de la lentille. Une telle paire de lunettes peut être du type lunettes correctrices d'amétropie teintées ou non, ou lunettes ou masque de protection solaire non correctrice, en particulier.The invention also relates to a pair of spectacles which comprises minus a lens and a pellet as described above, which is fixed on the lens. Preferably, the pellet is fixed on the posterior surface of the lens. Such a pair of spectacles may be of the type of ametropia corrective glasses, tinted or not, or glasses or non-corrective sun protection mask, in particular.
L'invention concerne enfin un procédé de fabrication d'une pastille de modification de puissance optique telle décrite plus haut, à partir d'un matériau thermoplastique.The invention finally relates to a method of manufacturing an optical power modification pad as described above, from a thermoplastic material.
D'autres particularités et avantages de la présente invention apparaîtront dans la description ci-après d'exemples de réalisation non limitatifs, en référence aux dessins annexés, dans lesquels :Other features and advantages of the present invention will become apparent in the following description of nonlimiting exemplary embodiments, with reference to the appended drawings, in which:
- la figure 1 a est une vue en perspective d'une pastille selon l'invention ;- Figure 1a is a perspective view of a pellet according to the invention;
- les figures 1 b et 1 c sont des vues en coupe respectives de deux pastilles selon l'invention ; - les figures 2a et 2b sont des vues en coupe de deux lentilles ophtalmiques, aptes à être adaptées à une paire de lunettes, munies de pastilles conformes aux figures 1 b et 1c ;- Figures 1b and 1c are respective sectional views of two pellets according to the invention; - Figures 2a and 2b are sectional views of two ophthalmic lenses, adapted to be adapted to a pair of glasses, provided with pellets according to Figures 1b and 1c;
- la figure 3 est un diagramme illustrant des variations de sauts de hauteur pour une pastille selon l'invention ; - la figure 4 illustre une convention de mesure d'un angle de mouillage ; etFIG. 3 is a diagram illustrating variations in height jumps for a tablet according to the invention; FIG. 4 illustrates a convention for measuring a wetting angle; and
- la figure 5 illustre schématiquement le principe de fabrication d'une pastille selon l'invention.- Figure 5 schematically illustrates the principle of manufacture of a pellet according to the invention.
Pour raison de clarté, les dimensions des éléments représentés ne sont pas en proportion avec des dimensions ou des rapports de dimensions réels. En outre des références identiques sur des figures différentes désignent des éléments identiques.For the sake of clarity, the dimensions of the elements shown are not in proportion to dimensions or ratios of real dimensions. In addition, identical references in different figures designate identical elements.
Conformément aux figures 1 a et 1 b, une pastille 1 selon l'invention possède une forme générale bombée, ou en coupelle. De préférence, la pastille a une forme de calotte sphérique, avec un rayon de courbure moyen qui peut être de l'ordre de 66 mm (millimètres) par exemple. Ce rayon de courbure moyen est avantageusement compris entre 88 mm et 53 mmAccording to Figures 1a and 1b, a tablet 1 according to the invention has a generally domed shape, or cup. Preferably, the pellet has a spherical cap shape, with an average radius of curvature which may be of the order of 66 mm (millimeters) for example. This radius of mean curvature is advantageously between 88 mm and 53 mm
La pastille 1 constitue une lentille de Fresnel : elle est formée d'une succession de zones de Fresnel qui sont disposées concentriquement de façon contiguë, par exemple 100 à 200 zones. Ces zones, référencées 2 sur les figures sont des couronnes coaxiales qui sont orientées et centrées selon un axe optique noté z. L'axe z passe alors par un centre optique de la pastille, qui est situé sur celle-ci et est noté O. De façon connue, chaque zone de Fresnel correspond à une portion de lentille, et l'épaisseur de la pastille 1 varie continûment à l'intérieur de cette zone selon une direction radiale, notée r, dans un plan perpendiculaire à l'axe z. Entre deux zones 2 successives, l'une des surfaces de la pastille 1 présente un saut de hauteur parallèle à l'axe z, référencé 3. Son amplitude est notée Δz. Il est précisé que les sauts de hauteur 3 qui sont présents entre des zones 2 successives sont superposés à la forme générale de la pastille 1 , cette forme générale étant bombée, éventuellement à peu près sphérique, selon l'invention.The pellet 1 constitutes a Fresnel lens: it is formed of a succession of Fresnel zones which are concentrically arranged contiguously, for example 100 to 200 zones. These zones, referenced 2 in the figures are coaxial crowns which are oriented and centered along an optical axis marked z. The z axis then passes through an optical center of the pellet, which is located thereon and is denoted by O. In known manner, each Fresnel zone corresponds to a lens portion, and the thickness of the pellet 1 varies. continuously within this zone in a radial direction, denoted r, in a plane perpendicular to the z axis. Between two successive zones 2, one of the surfaces of the pellet 1 has a height jump parallel to the z axis, referenced 3. Its amplitude is noted Δz. It is specified that the jumps in height 3 which are present between successive zones 2 are superimposed on the general shape of the pellet 1, this general shape being curved, possibly approximately spherical, according to the invention.
De préférence, les sauts de hauteur 3 correspondent à des discontinuités de hauteur de la face convexe de la pastille 1 , référencée Sl Entre deux sauts de hauteur 3 successifs, une zone de Fresnel 2 possède une dimension radiale qui est notée Δr, mesurée perpendiculairement à l'axe z. La face concave de la pastille 1 , référencée S2, est alors lisse, e désigne l'épaisseur moyenne de la pastille 1 , entre les faces S1 et S2. Elle est mesurée perpendiculairement à la face S2. De préférence, l'épaisseur e est inférieure à 2 mm et peut être comprise entre 0,5 et 0,7 mm. L'augmentation de poids d'un élément optique comprenant la pastille 1 , qui est due à cette dernière, est alors limitée.Preferably, the jumps of height 3 correspond to discontinuities in height of the convex face of the pellet 1, referenced Sl Between two successive jumps of height 3, a Fresnel zone 2 has a radial dimension which is denoted Δr, measured perpendicularly to the z axis. The concave face of the pellet 1, referenced S2, is then smooth, e denotes the average thickness of the pellet 1, between the faces S1 and S2. It is measured perpendicular to the S2 face. Preferably, the thickness e is less than 2 mm and may be between 0.5 and 0.7 mm. The increase in weight of an optical element comprising the patch 1, which is due to the latter, is then limited.
Afin de ne provoquer aucune diffusion lumineuse, aucune diffraction ni aucune irisation, ou bien que ces phénomènes ne soient pas perceptibles, les zones de Fresnel 2 sont dimensionnées de sorte que les amplitudes Δz des sauts de hauteur 3 sont au moins égales à cinq fois une longueur d'onde moyenne de la lumière visible. Par exemple, les amplitudes des sauts de hauteur 3 peuvent être comprises entre 5 μm (micromètres) et 250 μm,. De cette façon, à cause de la courte longueur de cohérence de la lumière naturelle, aucune interférence n'est perceptible qui se produirait entre des parties d'un faisceau lumineux qui traversent des zones 2 différentes. Autrement dit, la pastille 1 a un effet optique purement réfractif, qui est lié à la forme des surfaces S1 et S2 dans chaque zone 2, et n'engendre aucun effet diffractif visible. Comme décrit précédemment les amplitudes des sauts de hauteur 3 entre zones de Fresnel successives peuvent être variables sur au moins une partie de la surface de la pastille tout en conservant un profil sensiblement sphérique à la surface (S1 ). Dans ce cas de figure, l'amplitude Δz est plus importante à la périphérie de la pastille que dans sa zone centrale. Ainsi selon l'invention, dans le cas où les sauts de hauteur entre zones de Fresnel successives sont variables sur l'ensemble de la surface (S1 ) alors l'amplitude de ces sauts peut être compris entre 5 μm et 250 μm; dans le cas où les sauts de hauteur entre zones de Fresnel successives sont constant sur l'ensemble de la surface (S1 ) alors ils peuvent être compris entre 5 μm et 100 μm; et dans le cas où les sauts de hauteur entre zones de Fresnel successives ont des amplitudes sensiblement constantes à l'intérieur d'un cercle (C) de 10 mm de rayon entourant le centre optique de la pastille (O) , l'amplitude dans de cercle (C) peut être comprise entre 5 μm et 50 μm, et l'amplitude variable des sauts de hauteur à l'extérieur de ce cercle (C) jusqu'à une partie périphérique de la lentille peut être comprise entre 5 μm et 250 μm.In order not to cause any light scattering, no diffraction or iridescence, or that these phenomena are not perceptible, the Fresnel zones 2 are dimensioned so that the amplitudes Δz of the jumps of height 3 are at least equal to five times one. average wavelength of visible light. For example, the amplitudes of the jumps in height 3 can be between 5 microns (micrometers) and 250 microns. In this way, because of the short length of coherence of the light Naturally, no interference is perceptible that would occur between portions of a light beam that pass through different areas. In other words, the pellet 1 has a purely refractive optical effect, which is related to the shape of the surfaces S1 and S2 in each zone 2, and produces no visible diffractive effect. As described above, the amplitudes of the jumps in height 3 between successive Fresnel zones may be variable over at least a portion of the surface of the patch while maintaining a substantially spherical profile on the surface (S1). In this case, the amplitude Δz is greater at the periphery of the pellet than in its central zone. Thus according to the invention, in the case where the jumps in height between successive Fresnel zones are variable over the entire surface (S1) then the amplitude of these jumps can be between 5 microns and 250 microns; in the case where the jumps in height between successive Fresnel zones are constant over the entire surface (S1) then they may be between 5 microns and 100 microns; and in the case where the jumps in height between successive Fresnel zones have substantially constant amplitudes within a circle (C) of 10 mm radius surrounding the optical center of the patch (O), the amplitude in of a circle (C) may be between 5 μm and 50 μm, and the variable amplitude of the height jumps outside this circle (C) to a peripheral part of the lens may be between 5 μm and 250 μm.
La dimension radiale Δr de chaque zone 2 dépend alors de la puissance optique de la pastille 1 et de l'amplitude Δz des sauts de hauteur 3. Dans les conditions précédentes, et pour une puissance optique de la pastille 1 inférieure à 12 dioptries, Δr peut être comprise entre 10 μm et 2 mm. La pastille 1 peut avoir une vergence positive ou négative, en fonction du sens de variation de son épaisseur selon la direction r, à l'intérieur de chaque zone de Fresnel 2. Les figures 1 b et 1c correspondent respectivement à une pastille convergente ou divergente. La variation de l'épaisseur de la pastille à l'intérieur de chaque zone 2 peut être, en particulier, une fonction quadratique de r.The radial dimension Δr of each zone 2 then depends on the optical power of the pellet 1 and the amplitude Δz of the height jumps 3. In the preceding conditions, and for an optical power of the pellet 1 less than 12 diopters, Δr may be between 10 μm and 2 mm. The pellet 1 may have a positive or negative vergence, depending on the direction of variation of its thickness in the direction r, within each Fresnel zone 2. FIGS. 1b and 1c respectively correspond to a convergent or divergent pellet . The variation of the thickness of the pellet inside each zone 2 may be, in particular, a quadratic function of r.
Les figures 2a et 2b montrent deux lentilles ophtalmiques adaptables à une paire de lunettes qui sont munies, sur leurs faces postérieures SO, ou faces concaves, de pastilles conformes aux figures 1b et 1c, respectivement. II est entendu que chacune de ces pastilles peut être utilisée de la même façon avec la lentille de l'autre figure, et que les combinaisons illustrées ne sont prises qu'à titre d'exemples. La lentille de la figure 2a, référencé 10, peut être une lentille de protection solaire avec une puissance optique nulle, étant donné qu'elle possède deux faces parallèles. La pastille 1 lui confère alors une puissance non nulle, qui permet de corriger un défaut d'amétropie d'un porteur de la lentille. De cette façon, la pastille 1 permet d'adapter n'importe quelle lentille de protection solaire à un porteur ayant une amétropie. La paire de lunettes comprenant une telle lentille 10 peut alors être choisie par le porteur en fonction de son esthétisme, de sa teinte, ou de la forme de la monture associée. La lentille de la figure 2b, référencé 11 , correspond à une correction de myopie, étant donné qu'il est moins épais en son centre qu'à sa périphérie. La pastille 1 permet alors d'adapter la force de la correction en fonction du degré de myopie du porteur. Dans ce cas, la pastille 1 est placée sur le verre 11 de façon à superposer les axes optiques respectifs du verre et de la pastille. Une fonction identique est obtenue avec un verre correcteur d'hypermétropie.FIGS. 2a and 2b show two ophthalmic lenses that are adaptable to a pair of spectacles that are provided, on their posterior faces SO, or concave faces, pellets according to Figures 1b and 1c, respectively. It is understood that each of these pellets can be used in the same way with the lens of the other figure, and that the combinations illustrated are only taken as examples. The lens of FIG. 2a, referenced 10, may be a sun protection lens with zero optical power, since it has two parallel faces. The pellet 1 then gives it a non-zero power, which makes it possible to correct an ametropic defect of a wearer of the lens. In this way, the patch 1 makes it possible to adapt any sun protection lens to a carrier having an ametropia. The pair of spectacles comprising such a lens 10 may then be chosen by the wearer according to his aesthetics, his color, or the shape of the associated frame. The lens of Figure 2b, referenced 11, corresponds to a correction of myopia, since it is thinner at its center than at its periphery. The patch 1 then makes it possible to adapt the strength of the correction as a function of the degree of myopia of the wearer. In this case, the pellet 1 is placed on the glass 11 so as to superpose the respective optical axes of the glass and the pellet. An identical function is obtained with a corrective lens of hyperopia.
La pastille 1 est appliquée sur la face postérieure SO de la lentille 10 ou 11 , qui est lisse. Cette opération peut se faire directement par le praticien sur la paire de lunettes dans laquelle la lentille est montée sur la monture choisie par le porteur. Les sauts de hauteur 3 possèdent de préférence des amplitudes sensiblement constantes à l'intérieur d'un cercle C de rayon Rc entourant le centre O. De cette façon, la pastille 1 peut être appliquée plus facilement contre la surface SO de la lentille, au moins dans une zone centrale de la pastille, à l'intérieur du cercle C. La figure 3 représente un exemple de variation des amplitudes Δz des sauts de hauteur 3 selon la direction radiale r. Lorsque r est inférieur au rayon Rc du cercle C, les amplitudes Δz des sauts 3 sont constantes et la dimension radiale Δr des zones 2 diminue pour des zones 2 de plus en plus grandes. Au delà de la valeur Rc, c'est-à-dire dans une partie périphérique de la pastille 1 à l'extérieur du cercle C, les sauts de hauteur 3 peuvent avoir des amplitudes Δz qui augmentent, notamment pour éviter de réaliser des zones 2 qui auraient des dimensions radiales Δr très courtes. Rc peut être égal à 10 mm, par exemple, et les amplitudes Δz des sauts de hauteur 3 peuvent être égales à 40 μm à l'intérieur du cercle C.The pellet 1 is applied to the posterior surface SO of the lens 10 or 11, which is smooth. This operation can be done directly by the practitioner on the pair of glasses in which the lens is mounted on the frame chosen by the wearer. The jumps of height 3 preferably have substantially constant amplitudes within a circle C of radius R c surrounding the center O. In this way, the pellet 1 can be applied more easily against the surface SO of the lens, at least in a central zone of the pellet, inside the circle C. FIG. 3 represents an example of variation of the amplitudes Δz of the jumps of height 3 in the radial direction r. When r is smaller than the radius Rc of the circle C, the amplitudes Δz of the jumps 3 are constant and the radial dimension Δr of the zones 2 decreases for zones 2 of larger and larger. Beyond the value Rc, that is to say in a peripheral portion of the pellet 1 outside the circle C, the jumps of height 3 may have amplitudes Δz which increase, in particular to avoid making areas 2 which would have radial dimensions Δr very short. R c may be equal to 10 mm, for example, and the amplitudes Δz of the jumps of height 3 may be equal to 40 μm inside circle C.
La pastille 1 est collée sur Ia face SO de la lentille 10 ou 11 , avec une couche de matériau adhésif 20 disposée entre la pastille 1 et la lentille. Afin de ne pas dégrader l'effet optique de la pastille 1 , le matériau adhésif 20 qui est utilisée présente avantageusement, à l'état liquide, un angle de mouillage sur la pastille 1 qui est inférieur à 90°. La figure 4 illustre la convention qui est adoptée ici pour mesurer l'angle de mouillage θ du matériau adhésif 20 sur le matériau de la pastille 1. Dans ces conditions, le matériau adhésif 20 pénètre jusqu'au fond des sauts de hauteur 3 sans retenir de bulle d'air. Plusieurs types de matériau adhésif peuvent être utilisés, en particulier une colle polymérisable par irradiation ou par voie thermique ou du type latex. Des mises en œuvre particulièrement réussies de l'invention ont été obtenues avec une colle à base d'acrylate et polymérisable par irradiation UV.The wafer 1 is adhered to the SO face of the lens 10 or 11, with a layer of adhesive material 20 disposed between the wafer 1 and the lens. In order not to degrade the optical effect of the pellet 1, the adhesive material 20 which is used advantageously has, in the liquid state, a wetting angle on the pellet 1 which is less than 90 °. FIG. 4 illustrates the convention adopted here for measuring the wetting angle θ of the adhesive material 20 on the material of the wafer 1. Under these conditions, the adhesive material 20 penetrates to the bottom of the jumps of height 3 without retaining of air bubble. Several types of adhesive material may be used, in particular a radiation-polymerizable or thermal-curing adhesive or latex-type adhesive. Particularly successful embodiments of the invention have been obtained with an acrylate-based glue and polymerizable by UV irradiation.
La différence entre les valeurs respectives d'indice de réfraction optique de la pastille 1 et du matériau adhésif 20 détermine la modification de la puissance optique du verre qui est apportée par la pastille. Des valeurs respectives sensiblement égales à 1 ,59 et 1 ,50 pour le matériau de la pastille 1 et pour le matériau adhésif 20 ont permis d'obtenir des modifications de puissance optique supérieures à 6 dioptries, en valeurs absolues, voire supérieures à 12 dioptries. La lentille 10 ou 11 peut être constituée de tout matériau couramment utilisé dans l'industrie opthalmique, pour corriger une amétropie ou pour réaliser une protection solaire. Le matériau de la lentille ophtalmique, peut ainsi être de type minéral ou organique. A titre indicatif mais non limitatif, on peut citer comme matériau organique pouvant être utilisé dans le cadre de l'invention les matériaux classiquement utilisés en optique et en ophtalmie. Par exemple, sont adaptés les substrats du type polycarbonate; polyamide ; polyimides ; polysulfones ; copolymères de poly(éthylènetérephtalate) et polycarbonate; polyoléfines, notamment polynorbomènes ; polymères et copolymères de diéthylèneglycol bis(allylcarbonate); polymères et copolymères (méth)acryliques notamment polymères et copolymères (méth)acryliques dérivés de bisphenol-A; polymères et copolymères thio(méth)acryliques ; polymères et copolymères uréthane et thiouréthane ; polymères et copolymères époxy et polymères et copolymères épisulfide.The difference between the respective values of optical refractive index of the pellet 1 and the adhesive material 20 determines the change in the optical power of the glass which is provided by the pellet. Respective values substantially equal to 1, 59 and 1, 50 for the material of the pellet 1 and for the adhesive material 20 have made it possible to obtain optical power changes greater than 6 diopters, in absolute values, or even greater than 12 diopters . The lens 10 or 11 may be made of any material commonly used in the ophthalmic industry, to correct an ametropia or to achieve sun protection. The material of the ophthalmic lens can thus be of mineral or organic type. As an indication but not limiting, mention may be made as organic material that can be used in the context of the invention the materials conventionally used in optics and ophthalmia. For example, substrates of the polycarbonate type are suitable; polyamide; polyimides; polysulfones; copolymers of poly (ethylene terephthalate) and polycarbonate; polyolefins, especially polynorbomene; polymers and copolymers of diethylene glycol bis (allyl carbonate); (meth) acrylic polymers and copolymers, especially polymers and (meth) acrylic copolymers derived from bisphenol-A; thio (meth) acrylic polymers and copolymers; urethane and thiourethane polymers and copolymers; Epoxy polymers and copolymers and polymers and copolymers episulfide.
Une pastille selon l'invention peut être avantageusement produite par injection d'un matériau thermoplastique transparent, par exemple à base de polycarbonate, dans un moule d'injection. Le moule est alimenté, d'une façon connue en soi, par un dispositif de compression et d'injection du matériau, qui comprend une vis de compression et un dispositif de chauffage. La figure 5 illustre schématiquement un tel moule 100. Deux inserts, référencés 101 et 102 sont placés dans le moule. L'insert 101 définit la face S1 de la pastille 1 qui comporte les sauts de hauteur, et l'insert 102 définit la face lisse S2. Ils sont disposés en vis-à-vis et séparés par un espace 103 qui correspond à la pastille 1. Le matériau thermoplastique est alors injecté dans le moule 100 par un une buse d'injection 104, de façon à remplir l'espace 103. Lorsque le moule 100 est ensuite ouvert et après refroidissement, la pastille 1 peut être récupérée.A pellet according to the invention may advantageously be produced by injection of a transparent thermoplastic material, for example based on polycarbonate, into an injection mold. The mold is fed, in a manner known per se, by a device for compressing and injecting the material, which comprises a compression screw and a heating device. Figure 5 schematically illustrates such a mold 100. Two inserts, referenced 101 and 102 are placed in the mold. The insert 101 defines the face S1 of the pellet 1 which comprises the jumps in height, and the insert 102 defines the smooth face S2. They are arranged vis-à-vis and separated by a space 103 which corresponds to the pellet 1. The thermoplastic material is then injected into the mold 100 by an injection nozzle 104, so as to fill the space 103. When the mold 100 is then opened and after cooling, the pellet 1 can be recovered.
Il est entendu que de nombreuses adaptations peuvent être introduites dans les réalisations qui ont été décrites en détail ci-dessus, tout en conservant certains au moins des avantages de l'invention. En particulier, l'Homme du métier comprendra que les matériaux et les valeurs citées ne sont qu'à but d'illustration, et peuvent être modifiées. It is understood that many adaptations can be introduced in the embodiments that have been described in detail above, while retaining at least some of the advantages of the invention. In particular, those skilled in the art will understand that the materials and values cited are for illustrative purposes only, and may be modified.

Claims

R E V E N D I C A T I O N S
1. Pastille (1) destinée à être fixée sur une surface courbe (SO) d'un composant optique (10, 11) pour modifier une puissance optique dudit composant, la pastille comprenant une lentille de Fresnel réfractive formée d'une série de zones de Fresnel (2) disposées les unes à l'intérieur des autres parallèlement à une face lisse de ladite pastille (S2) et présentant des sauts de hauteur (3) entre deux zones successives plus grands que cinq fois une longueur d'onde moyenne de lumière visible, lesdits sauts de hauteur étant mesurés selon une direction (z) perpendiculaire à la face lisse en un centre optique de la pastille (O),A wafer (1) for attachment to a curved surface (SO) of an optical component (10, 11) for modifying an optical power of said component, the wafer comprising a refractive Fresnel lens formed of a series of zones Fresnel (2) arranged inside each other parallel to a smooth face of said wafer (S2) and having jumps in height (3) between two successive zones greater than five times an average wavelength of visible light, said jumps in height being measured in a direction (z) perpendicular to the smooth face at an optical center of the pellet (O),
la pastille étant caractérisée en ce qu'elle possède une forme généralement bombée avec un rayon de courbure moyen compris entre 135 mm et 53 mm, en plus des sauts de hauteur entre zones de Fresnel successives, et en ce que les sauts de hauteur (3) entre zones de Fresnel successives sont situés sur une face (S1) généralement convexe de la pastille.the tablet being characterized in that it has a generally domed shape with an average radius of curvature of between 135 mm and 53 mm, in addition to jumps in height between successive Fresnel zones, and in that the jumps in height (3 ) between successive Fresnel zones are located on a generally convex face (S1) of the pellet.
2. Pastille selon la revendication 1 , possédant une forme générale sensiblement sphérique en plus des sauts de hauteur (3) entre zones de Fresnel successives.2. A tablet according to claim 1, having a substantially spherical general shape in addition to jumps in height (3) between successive Fresnel zones.
3. Pastille selon la revendication 1 ou 2, possédant un rayon de courbure moyen compris entre 88 mm et 53 mm, et préférentiellement sensiblement égale à 66 mm.3. The tablet according to claim 1 or 2, having an average radius of curvature of between 88 mm and 53 mm, and preferably substantially equal to 66 mm.
4. Pastille selon l'une quelconque des revendications précédentes, dans laquelle les sauts de hauteur (3) entre zone de Fresnel successives ont des amplitudes variables sur l'ensemble de la surface de la face (S1) de la pastille.4. A tablet according to any one of the preceding claims, wherein the jumps in height (3) between successive Fresnel zone have variable amplitudes over the entire surface of the face (S1) of the pellet.
5. Pastille selon l'une quelconque des revendications précédentes, dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives ont des amplitudes sensiblement constantes à l'intérieur d'un cercle (C) de 10 mm de rayon entourant le centre optique de la pastille (O). The tablet according to any one of the preceding claims, wherein the jumps in height (3) between successive Fresnel zones have substantially constant amplitudes within a circle (C) of 10 mm radius surrounding the center. optics of the pellet (O).
6. Pastille selon la revendication 5, dans laquelle les sauts de hauteurThe tablet according to claim 5, wherein the height jumps
(3) entre zones de Fresnel successives ont des amplitudes qui augmentent dans une partie périphérique de la pastille, en s'éloignant du centre optique (O) à l'extérieur du cercle (C) de 10 mm de rayon.(3) between successive Fresnel zones have amplitudes that increase in a peripheral portion of the patch, away from the optical center (O) outside the circle (C) of 10 mm radius.
7. Pastille selon la revendication 5 ou 6, dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives à l'intérieur du cercle (C) ont des amplitudes comprises entre 5 μm et 50 μm, et les sauts de hauteur (3) entres zones de Fresnel successives à l'extérieur du cercle (C) jusqu'à une partie périphérique de la pastille ont des amplitudes variables comprises entre 5 μm et 250 μm.7. A tablet according to claim 5 or 6, wherein the jumps in height (3) between successive Fresnel zones inside the circle (C) have amplitudes of between 5 μm and 50 μm, and the jumps in height ( 3) between successive Fresnel zones outside the circle (C) to a peripheral portion of the pellet have variable amplitudes between 5 microns and 250 microns.
8. Pastille selon l'une quelconque des revendications 1 à 3, dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives ont des amplitudes sensiblement constantes sur l'ensemble de la surface (S1) de la pastille.8. A tablet according to any one of claims 1 to 3, wherein the jumps in height (3) between successive Fresnel zones have substantially constant amplitudes over the entire surface (S1) of the pellet.
9. Pastille selon la revendication 8, dans laquelle les sauts de hauteurThe tablet according to claim 8, wherein the height jumps
(3) entre zones de Fresnel successives ont des amplitudes comprises entre 5 μm et 100 μm.(3) between successive Fresnel zones have amplitudes between 5 μm and 100 μm.
10. Pastille selon l'une quelconque des revendications précédentes, dans laquelle les zones de Fresnel (2) ont une dimension (Δr) comprise entre 10 μm et 2 mm, selon une direction radiale (r) passant par le centre optique (O) et perpendiculaire à un axe optique de la pastille.10. A tablet according to any one of the preceding claims, in which the Fresnel zones (2) have a dimension (Δr) of between 10 μm and 2 mm, in a radial direction (r) passing through the optical center (O). and perpendicular to an optical axis of the pellet.
11. Pastille selon l'une quelconque des revendications précédentes, ayant une épaisseur moyenne (e) inférieure à 2 mm, mesurée perpendiculairement à la face lisse (S2) de la pastille.11. A tablet according to any one of the preceding claims, having an average thickness (e) less than 2 mm, measured perpendicular to the smooth face (S2) of the pellet.
12. Pastille selon la revendication 11 , ayant une épaisseur moyenne (e) comprise entre 0,5 et 0,7 mm.12. A tablet according to claim 11, having an average thickness (e) of between 0.5 and 0.7 mm.
13. Pastille selon l'une quelconque des revendications précédentes, comprenant un matériau thermoplastique transparent. 13. A tablet according to any one of the preceding claims, comprising a transparent thermoplastic material.
14. Pastille selon l'une quelconque des revendications précédentes, comprenant un matériau à base de polycarbonate.The tablet according to any one of the preceding claims comprising a polycarbonate material.
15. Elément optique comprenant un composant optique de base (10, 11) et une pastille (1) selon l'une quelconque des revendications 1 à 14, fixée sur ledit composant.An optical element comprising a base optical component (10, 11) and a wafer (1) according to any of claims 1 to 14 attached to said component.
16. Elément selon la revendication 15, dans lequel une face (S1) de la pastille comportant les sauts de hauteur (3) est tournée vers le composant (10, 11).16. Element according to claim 15, wherein a face (S1) of the pellet comprising the jumps in height (3) is turned towards the component (10, 11).
17. Elément selon la revendication 15 ou 16, dans lequel la pastille (1) est fixée sur le composant (10, 11) par une couche d'un matériau adhésif (20) disposée entre ladite pastille et ledit composant.The element of claim 15 or 16, wherein the wafer (1) is attached to the component (10, 11) by a layer of an adhesive material (20) disposed between said wafer and said component.
18. Elément selon la revendication 17, dans lequel la pastille (1) comprend un matériau d'indice de réfraction optique sensiblement égal à 1 ,59 et le matériau adhésif (20) possède un indice de réfraction optique sensiblement égal à 1 ,50.18. Element according to claim 17, wherein the pellet (1) comprises a material of optical refractive index substantially equal to 1.59 and the adhesive material (20) has an optical refractive index substantially equal to 1.50.
19. Elément selon la revendication 17 ou 18, dans lequel le matériau adhésif (20) est du type colle polymérisable par irradiation ou par voie thermique ou du type latex.19. Element according to claim 17 or 18, wherein the adhesive material (20) is of the type polymerizable by irradiation or thermal or latex type.
20. Elément selon la revendication 19, dans lequel la colle (20) est à base d'acrylate et polymérisable par irradiation UV.20. Element according to claim 19, wherein the glue (20) is based on acrylate and polymerizable by UV irradiation.
21. Elément selon l'une quelconque des revendications 17 à 20, dans lequel le matériau adhésif (20) présente, à l'état liquide, un angle de mouillage inférieur à 90° sur la pastille (1).21. Element according to any one of claims 17 to 20, wherein the adhesive material (20) has, in the liquid state, a wetting angle of less than 90 ° on the pellet (1).
22. Elément selon l'une quelconque des revendications 15 à 21 , dans lequel le composant de base est une lentille ophtalmique (11).An element according to any one of claims 15 to 21, wherein the base component is an ophthalmic lens (11).
23. Elément selon la revendication 22, dans lequel le composant de base est une lentille ophtalmique correctrice d'amétropie. The element of claim 22, wherein the base component is an ophthalmic corrective ametropic lens.
24. Elément selon la revendication 22 ou 23, dans lequel la lentille ophtalmique est teintée ou partiellement réfléchissante.The element of claim 22 or 23, wherein the ophthalmic lens is tinted or partially reflective.
25. Elément selon l'une quelconque des revendications 15 à 24, dans lequel le composant de base est une lentille adaptée à une paire de lunettes de protection solaire (10).An element according to any one of claims 15 to 24, wherein the base component is a lens adapted to a pair of sunglasses (10).
26. Elément selon l'une quelconque des revendications 22 à 25, dans lequel la pastille (1) est fixée sur une surface concave (SO) du composant de base (10, 11).Element according to any one of claims 22 to 25, wherein the pellet (1) is fixed on a concave surface (SO) of the base component (10, 11).
27. Elément selon l'une quelconque des revendications 15 à 22, dans lequel le composant de base est une lentille de masque, notamment masque solaire, de ski ou de plongée, ou une visière, notamment une visière de casque.27. Element according to any one of claims 15 to 22, wherein the base component is a mask lens, including sun mask, ski or diving, or a visor, including a helmet visor.
28. Paire de lunettes comprenant au moins une lentille (10, 11) et une pastille (1) selon l'une quelconque des revendications 1 à 14, fixée sur ladite lentille.28. Pair of spectacles comprising at least one lens (10, 11) and a tablet (1) according to any one of claims 1 to 14, fixed on said lens.
29. Paire de lunettes selon la revendication 28, du type lunettes correctrices d'amétropie ou lunettes de protection solaire.29. A pair of spectacles according to claim 28, of the type refractive glasses ametropia or sun protection glasses.
30. Paire de lunettes selon la revendication 28 ou 29, dans laquelle la pastille (1) est fixée sur une face postérieure de la lentille.30. A pair of spectacles according to claim 28 or 29, wherein the pellet (1) is fixed on a rear face of the lens.
31. Paire de lunettes selon l'une quelconque des revendications 28 à31. Pair of spectacles according to any one of claims 28 to
30, dans laquelle la pastille (1) est fixée sur la lentille avec une face (S1) de ladite pastille comportant les sauts de hauteur (3) tournée vers la lentille.30, wherein the wafer (1) is fixed on the lens with a face (S1) of said wafer having the height jumps (3) facing the lens.
32. Paire de lunettes selon l'une quelconque des revendications 28 à32. Pair of spectacles according to any one of claims 28 to
31 , dans laquelle la pastille (1) est maintenue sur la lentille au moyen d'un matériau adhésif.31, wherein the tablet (1) is held on the lens by means of an adhesive material.
33. Procédé de fabrication d'une pastille selon l'une quelconque des revendications 1 à 14, comprenant les étapes suivantes : - disposer, en vis-à-vis dans un moule d'injection (100), deux inserts (101 , 102) définissant respectivement la face à sauts de hauteur (S1) et la face lisse (S2) de la pastille (1), et séparés par un espace (103) correspondant à la pastille (1) à fabriquer ; et - injecter un matériau thermoplastique transparent dans le moule (100) de façon à remplir l'espace entre les deux inserts (103). 33. A method of manufacturing a tablet according to any one of claims 1 to 14, comprising the following steps: disposing, facing each other in an injection mold (100), two inserts (101, 102) respectively defining the height-jumping face (S1) and the smooth face (S2) of the pellet (1) , and separated by a space (103) corresponding to the pellet (1) to be manufactured; and injecting a transparent thermoplastic material into the mold (100) so as to fill the space between the two inserts (103).
EP07766108A 2006-06-07 2007-05-29 Disk for modification of the power of an optical component Withdrawn EP2024765A1 (en)

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FR0605059A FR2902200B1 (en) 2006-06-07 2006-06-07 PASTILLE FOR MODIFYING A POWER OF AN OPTICAL COMPONENT
PCT/FR2007/051340 WO2007141440A1 (en) 2006-06-07 2007-05-29 Disk for modification of the power of an optical component

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US20100007846A1 (en) 2010-01-14
CN101467076A (en) 2009-06-24
US8210677B2 (en) 2012-07-03
BRPI0711960B1 (en) 2018-06-05
FR2902200B1 (en) 2008-09-12
WO2007141440A1 (en) 2007-12-13
BRPI0711960A2 (en) 2011-12-20
FR2902200A1 (en) 2007-12-14
JP2009540347A (en) 2009-11-19

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