Method for producing a coated lens

Abstract

The invention relates to a method for producing a coated lens (10), wherein the method comprises at least the following steps: applying a coating precursor material (12) to a surface of an uncoated or precoated lens substrate body (14) and applying electromagnetic radiation (24) to the coating precursor material (12) on the lens substrate body (14) in order to cure the coating precursor material (12), wherein the material of the lens substrate body (14) at least partially absorbs the electromagnetic radiation. According to the invention, the electromagnetic radiation (24) is applied to the applied coating precursor material (12) over an irradiation period (ts) such that the lens substrate body (14) is heated, at least on a side facing the coating precursor material (12), to a temperature (TH) for photonic curing, during which the coating precursor material (14) and the material of the lens substrate body (12) bond, wherein the intensity of the electromagnetic radiation (24) and the irradiation period (ts) are selected such that, during treatment, a shear force introduced into the lens substrate body (14) from the coating precursor material (12) causes only deformation of the lens substrate body (14), which deformation is below a specified limit value (G).

Description

[0001] u

[0002] - 1 -

[0003] Method for manufacturing a coated lens

[0004] Description

[0005] The invention relates to a method for producing a coated lens, wherein the method comprises at least: applying a coating precursor material to a surface of one side of an uncoated or precoated lens substrate body and applying electromagnetic radiation to the coating precursor material on the lens substrate body in order to cure the coating precursor material, wherein the material of the lens substrate body at least partially absorbs the electromagnetic radiation.

[0006] For the purposes of this invention, a lens is understood to be a glass or plastic body having two optically effective surfaces, i.e., surfaces that refract light, which are positioned opposite each other. In particular, a lens within the meaning of this invention is a spectacle lens designed for insertion into a spectacle frame. A spectacle lens can be, for example, a plano lens according to section 3.6.3 of DIN EN ISO 13666:2019-12, or a corrective lens (section 3.5.1), a protective lens (section 3.5.4), an absorption lens (section 3.5.5), a tinted lens (section 3.5.6), a clear lens (section 3.5.7), a uniformly tinted lens (section 3.5.8), a gradient-tinted lens (section 3.5.9), a photochromic lens (section 3.5.11), or a polarizing lens (section 3.5.12) according to section 3.5.12 of DIN EN ISO 13666:2019-12.

[0007] A lens substrate body within the meaning of the invention is a typically pre-formed piece of material for manufacturing a lens in any state prior to the completion of surface processing. A lens substrate body can be a spectacle lens blank. A lens substrate body can also be a so-called semi-finished product in the form of a lens blank with only one optically finished surface. Such semi-finished products are also referred to as spectacle lens semi-finished products.

[0008] A lens substrate body can consist of an organic hard resin, such as a thermosetting hard resin according to section 3.3.3 of DIN EN ISO 13666:2019-12, a thermoplastic hard resin according to section 3.3.4 of DIN EN ISO 13666:2019-12 or a photochromic material according to section 3.3.5 of DIN EN ISO 13666:2019-12.

[0009] A method of the type mentioned above for manufacturing a coated lens is known from EP 4 171 932 B1.

[0010] US Patent 2021 / 003867 A1 describes a process for manufacturing a plastic lens with a hardened coating layer. Here, an unhardened coating layer consisting of a photocurable coating composition comprising at least a) a photochromic compound, b) a radically polymerizable monomer, and c) a photopolymerization initiator is applied to the surface of a plastic lens. The plastic lens with the unhardened coating layer is then irradiated with light from an LED with a peak emission wavelength of 350 nm < A < 450 nm from above the outer surface of the unhardened coating layer to harden the unhardened coating layer. The irradiance BI of the light on the surface of the unhardened coating of the plastic lens with the unhardened coating is only BI < 100 mW / cm² at the peak emission wavelength. 2and for which the maximum integrated light quantity MIL on the surface of the unhardened coating of the plastic lens with an unhardened coating applies here: 2 J / cm² 2 < MIL < 50 J / cm 2 .

[0011] Lenses, especially spectacle lenses, are often enhanced by coating them with lacquers. Lens substrates are soft when warmed or heated. Spectacle lenses should be as thin as possible to make them visually appealing to the wearer. Coated lenses can improve a wearer's vision and protect them from strong sunlight. Furthermore, coatings can also protect spectacle lenses from scratches.

[0012] To ensure that a coating made of a coating precursor material in the form of an organic, thermosetting hard resin is well cured and adheres well to a lens substrate body, it is known to temper the lens substrate body with the coating precursor material in a tempering oven for several hours after the hard resin has been cured by irradiation with UV light.

[0013] Due to the heating that the lens substrate experiences during annealing, it can deform irreversibly. This can result in the optical properties of the lens deviating from the specifications that must be met. Furthermore, annealing can cause cracks in a coating applied to the lens substrate, the cause of which is fundamentally undesirable deformation of the lens substrate during annealing.

[0014] The lens substrate body can deform due to a shrinkage or shear force introduced into a lens substrate body from a coating in a tempering oven, if the latter is soft due to the temperature prevailing in the tempering oven.

[0015] The object of the invention is to provide a method for manufacturing a lens enhanced by at least one coating, wherein the method ensures that the lens meets specified requirements. This object is achieved by the method specified in claim 1. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

[0016] The invention is based on the idea of ​​designing the treatment process for a coating precursor material in the form of an organic, thermosetting hard resin on a lens substrate body in such a way that the coating precursor material is cured and directly or indirectly bonded firmly to the lens substrate body, without the lens substrate body being deformed in the treatment process in such a way that the lens no longer meets the requirements placed on it.

[0017] One idea of ​​the invention is that the coating precursor material on the lens substrate body is photonically hardened using electromagnetic radiation.

[0018] Photonic hardening refers to the hardening of the coating precursor material on the lens substrate by generating heat. This heat is caused, on the one hand, by a thermal radiation component of electromagnetic radiation in the infrared spectral range, and on the other hand, by heat developed within the coating precursor material and / or the lens substrate due to absorption of electromagnetic radiation. The coating precursor material may contain a photoinitiator.

[0019] The inventors have recognized that if the minimum thickness DL of a lens substrate body of a material from the group polyallyldiglycol carbonate ((P)ADC), polyurethane, polycarbonate is DI > 2.5 mm, then treating a lens having such a lens substrate body by means of electromagnetic radiation or heat to a temperature in the range of 100°C to 120°C does not cause any deformations that impair the optical properties of the lens. A lens substrate body made of a material from the group polyallyldiglycol carbonate ((P)ADC), polyurethane, polycarbonate can consist of, for example, a material with the trade name CR-39, CR-330, CR-607, CR-630, RAV 700, RAV 7NG, RAV 7AT, RAV 710, RAV 713, RAV 720, RA-Volution, Trivex, Panlite, Lexan, Makrolon, MR10, MR7, MR8 or Tribrid.

[0020] The inventors discovered that a coated lens can deform during curing if the entire lens body heats up and is therefore soft. The coated lens can then deform during curing due to shrinkage stress caused by the coating.

[0021] A deformation effect can occur not only with so-called hard coatings, but also with so-called functional coatings, such as photochromic coatings, tinting coatings, primers and coatings with resins based on acrylate, urethane and epoxy resins.

[0022] If the coating contains, for example, a photoinitiator, or if the coating is multilayered and one of the layers can be cured using UV light, UV irradiation is required to cure the coating.

[0023] During UV curing, the lens body can deform if it is heated or becomes heated. However, if the substrate is not heated during the curing process of a UV-curable coating, and no additional thermal curing is required for the coating, then the lenses will not soften during UV curing, and the shrinkage stress of the coating will not be sufficient to cause lens deformation.

[0024] However, if the coating requires thermal curing as a single or additional curing step—where, depending on the type of resin and / or whether it's a single- or multi-layer coating, a first curing step may involve UV curing or only thermal curing—then lenses will soften due to the high temperatures to which they are exposed. As a consequence, lenses can deform during the curing process.

[0025] The inventors have recognized that if the layer thickness ds of a coating pre-material applied to a surface of one side of an uncoated or pre-coated lens substrate body is: ds < 3pm, a deformation of the lens substrate body caused in the treatment process by the photonic hardening step is negligible and then plays no role in the optical properties of a manufactured lens.

[0026] Furthermore, the inventors have recognized that photonic hardening of coating precursor material by irradiation on a lens substrate body, or thermal hardening of coating precursor material by irradiation on a lens substrate body, or annealing of the lens substrate body with the coating precursor material over a time interval for which length ta > 300s, causes no or only a slight deformation of the lens substrate body if it is ensured that the storage modulus Sm of the lens substrate body material during hardening is Sm > 1000 MPa, preferably Sm > 1500 MPa.

[0027] In particular, the inventors have recognized that if the treatment process includes as a treatment step photonic hardening of the coating precursor material by irradiation on a lens substrate body, or thermal hardening of the coating precursor material by irradiation on a lens substrate body, or annealing of a lens substrate body with coating precursor material over a time interval for which the length ta is greater than 300 s, then by selecting the layer thickness of the coating material applied to the surface of the lens substrate body, a deformation of the lens substrate body can be reduced or prevented, i.e., in particular, a relative change Ah / h in the height h of the lens substrate body at its apex in the treatment process can be reduced or prevented, if the storage modulus Sm of the lens substrate body material is less than 1500 MPa.

[0028] The invention proposes to provide at least the following steps in the manufacture of a coated lens:

[0029] Applying a coating precursor material to a surface of an uncoated or precoated lens substrate body; treating the coating precursor material on the lens substrate body by means of electromagnetic radiation having a spectral intensity distribution, wherein the material of the lens substrate body or the coating precursor material has at least one absorption band overlapping with the spectral intensity distribution of the electromagnetic radiation used for treatment, such that the material of the lens substrate body or the coating precursor material at least partially absorbs the electromagnetic radiation.

[0030] The electromagnetic radiation can, for example, have a spectral intensity distribution extending into the ultraviolet spectral range, whereby the material of the lens substrate body or the coating precursor material absorbs the electromagnetic radiation at least partially in the ultraviolet spectral range.

[0031] The wavelength of the electromagnetic radiation can, for example, lie at least partially in the ultraviolet spectral range in order to harden the coating precursor material.

[0032] Such application of electromagnetic radiation to the coating precursor material for an irradiation time ts causes the lens substrate body to heat up, at least on one side facing the coating precursor material, to a temperature TH for photonic hardening, at which the coating precursor material and the lens substrate material bond. The intensity of the electromagnetic radiation and the irradiation time can be selected such that, during treatment, a shear force introduced into the lens substrate body from the coating precursor material causes only a deformation of the lens substrate body that is below a predetermined limit value G.

[0033] It should be noted that during photonic curing by applying electromagnetic radiation to the coating precursor material on the lens substrate body, a temperature gradient can form which does not lead to a deformation of the lens substrate body if the coating precursor material is arranged on a convexly curved surface of the lens substrate body and the temperature of the lens substrate body at this surface is higher than the temperature in the interior of the lens substrate body, and this temperature in turn is higher than the temperature at a concavely curved rear surface of the lens substrate body.

[0034] The reason for this is that the electromagnetic radiation first passes through the coating precursor material and through the lens substrate body to reach its rear surface, whereby the intensity of the electromagnetic radiation decreases due to absorption and scattering on its way through the coating precursor material and the lens substrate body.

[0035] The specified limit value G can, for example, be a limit value from the group consisting of the relative change in height Ah / h of a vertex of the lens substrate body and / or the relative change Akl / kl of a local curvature of the lens substrate body and / or the relative mean curvature Akm / km of the lens substrate body and / or the relative change in refractive power ABK / BK of the lens substrate body. Refractive power is understood to mean spherical or cylindrical refractive power. The limit value G is preferably: G < 25%, preferably G < 10%, preferably G < 5%, and particularly preferably G < 1%.

[0036] The inventors have recognized that if the irradiation time ts is less than 300s, unwanted deformation of the lens substrate body during irradiation with electromagnetic radiation can be minimized.

[0037] The invention exploits the fact that, in addition to a brief photonic curing triggered by the application of electromagnetic radiation, the application of electromagnetic radiation to the uncoated or precoated lens substrate creates a temperature gradient that helps to prevent lens deformation. This is because the temperature on the side of the lens substrate facing the electromagnetic radiation source is higher than the temperature within the lens substrate, and the temperature on the side of the lens substrate facing away from the electromagnetic radiation source is lower than the temperature within the lens substrate. This situation differs from that in an oven, where a locally constant temperature prevails.

[0038] The lens substrate material can be, for example, a material from the group consisting of polyallyldiglycol carbonate ((P)ADC), polyurethane, or polycarbonate. In particular, the lens substrate can consist of one or more materials or a mixture of materials from the group consisting of CR-39, CR-330, CR-607, CR-630, RAV 700, RAV 7NG, RAV 7AT, RAV 710, RAV 713, RAV 720, RAVolution, Trivex, Panlite, Lexan, Makrolon, MR10, MR7, MR8, or Tribrid.

[0039] The lens substrate then consists of a polymer exhibiting viscoelastic properties. The shrinkage force of a lens coating causes a material deformation that depends on time and temperature. The comparatively short treatment time required for curing by irradiation, compared to the curing time of a coating precursor material in an oven, means that the material may not deform, or only deform slightly, even at potentially higher temperatures, because deformation takes time.

[0040] The electromagnetic radiation can be supplied, for example, by means of a xenon lamp. By supplying the radiation to the surface of an uncoated or precoated lens substrate through the coating precursor material, it can be achieved that the lens substrate is primarily heated where the coating precursor material is located, and the temperature of the lens substrate on the side facing away from the coating precursor material is lower than on the side to which the coating precursor material is applied. A temperature gradient is then formed within the lens substrate, which is beneficial for the stability of the lens substrate.

[0041] In particular, the electromagnetic radiation can be pulsed. This is achieved by emitting electromagnetic radiation with a mean irradiance I in the range of 1500 mW / cm². 2 < I < 35000 mW / cm 2, preferably in the range of 2000 mW / cm² 2 < I < 30000 mW / cm 2 When the coating precursor material is applied to the surface of the lens substrate body through the coating precursor material, the coating precursor material is irradiated onto the surface of an uncoated or precoated lens substrate body with an intensity that is approximately 1000 to 10000 times higher than the irradiation intensity typically used for UV curing of a coating precursor material.

[0042] For the material applied through the surface of the coating precursor material

[0043] Radiant energy SE preferably applies: 25 J / cm² 2 < SE < 500 J / cm 2By ensuring that the electromagnetic radiation has a spectral intensity distribution extending into the ultraviolet spectral range and that the material of the lens substrate body absorbs the electromagnetic radiation at least partially in the ultraviolet spectral range, it is possible to achieve a heating effect of the electromagnetic radiation on the lens substrate body.

[0044] The inventors have realized that in the above-mentioned methods for manufacturing a coated lens, the minimum thickness DL of the lens substrate body can be less than 2.5 mm without the lens substrate body deforming.

[0045] The inventors also recognized that a layer thickness ds of the coating precursor material can be more than 3pm without the lens substrate body deforming.

[0046] The invention will now be explained in more detail with reference to the exemplary embodiments shown schematically in the drawing.

[0047] They show:

[0048] Fig. 1 shows the production of a coated lens in a treatment process that includes photonic and thermal hardening of the coating precursor material on the lens substrate body by irradiation;

[0049] Fig. 2 shows the emission spectrum of a xenon flash lamp with the absorption spectrum of the coating precursor material on the lens substrate body and the absorption spectrum of the lens substrate body;

[0050] Fig. 3 shows the intensity of light pulses from a xenon flash lamp; Fig. 4 shows a deformation of a lens caused by a coating in a treatment process;

[0051] Fig. 5 shows the storage module Sm of a lens substrate body for different glass materials;

[0052] Fig. 6 shows the deformation of a coated lens for different thicknesses of a lens substrate body and for different glass materials in an identical treatment process; and

[0053] Fig. 7 shows the deformation of a coated lens for different coating thicknesses and for different glass materials in an identical treatment process.

[0054] Figure 1 shows the production of a coated lens 10 in a treatment process that includes both photonic and thermal curing of a coating precursor material 12 to a cured coating precursor material 12' on a lens substrate body 14 by irradiation. The lens substrate body 14 is a spectacle lens blank made of a polymeric glass material, e.g., the plastic glass material with the trade name CR39. However, the spectacle lens blank can also be made of, for example, a material with the trade name CR-39, CR-330, CR-607, CR-630, RAV 700, RAV 7NG, RAV 7AT, RAV 710, RAV 713, RAV 720, RAVolu- tion, Trivex, Panlite, Lexan, Makrolon, MR10, MR7, MR8, or Tribrid.

[0055] The coating precursor material 12 is applied to the lens substrate body 14 from a metering unit 18 in a coating station 16. It should be noted that the coating precursor material 12 can also be applied to the substrate body 14, for example, by spin coating. Furthermore, the coating precursor material 12 can also be applied to the lens substrate body 14 by spray coating or inkjet coating.

[0056] The coating precursor material 12 can, for example, be a hard coating precursor material in the form of a silane derivative of formula R. 1 R 2 3- n Si(OR 3 ) n or R 1 4-nSi(OR 3 ) nbe, where R1 comprises an alkyl group, an aryl group or a heteroaryl group, each of which may be substituted, R2 is an organic residue comprising an epoxide group, R3 comprises an alkyl group, a cycloalkyl group, an aryl group or a heteroaryl group, each of which may be substituted, where: n = 2 or 3.

[0057] The coating precursor material 12 can also be a primer coating precursor material, e.g. a primer coating precursor material comprising: i) at least one aqueous aliphatic, cycloaliphatic, aromatic or heteroaromatic polyurethane dispersion, at least one aqueous aliphatic, cycloaliphatic, aromatic or heteroaromatic polyurea dispersion, at least one aqueous aliphatic, cycloaliphatic, aromatic or heteroaromatic polyurethane-polyurea dispersion, at least one aqueous aliphatic, cycloaliphatic, aromatic or heteroaromatic polyester dispersion, preferably at least one aqueous aliphatic polyurethane dispersion or at least one aqueous aliphatic polyester dispersion and more preferably at least one aqueous aliphatic polyurethane dispersion, ii) at least one solvent, iii) optionally at least one additive.In the treatment process, the coating precursor material 12 applied to the lens substrate body 14 is first irradiated with light pulses from a xenon flash lamp 22 in a treatment station 20.

[0058] Fig. 2 shows the emission spectrum 26 of the xenon flash lamp 22. The emission spectrum of the xenon flash lamp 22 extends from the ultraviolet to the infrared wavelength range with wavelengths 200 nm < A < 1000 nm. The xenon flash lamp 22 generates thermal radiation by emitting high-energy electromagnetic radiation pulses, which lead to thermal curing of the coating precursor material.

[0059] In addition, the xenon flash lamp 22 generates electromagnetic radiation 24 with wavelengths in the UV range, which can trigger UV light-induced curing of the coating precursor material 12 if, in addition to thermal curing, UV curing of the coating precursor material is also desirable and the coating precursor material contains a photoinitiator for UV curing.

[0060] Figure 3 shows an example of the time-dependent intensity of the light from the xenon flash lamp 22 of a single light pulse in the form of an electromagnetic pulse 23. The xenon flash lamp 22 generates such electromagnetic pulses 23 with a defined radiation dose, which in this case is, for example, 2.15 J / cm². 2 Each pulse 23 consists, for example, of 12 micropulses 25 with an average duty cycle of, for example, 35%. In this context, the duty cycle is understood to be the ratio of on-time to off-time.

[0061] Using the xenon flash lamp 22, pulses 23 are generated, for example, 150 times consecutively, as shown in Fig. 3. The pulse firing rate is, for example, 1.5 Hz. In this way, the coating precursor material 12 is deposited on the lens substrate body 14, and the lens substrate body is exposed to a radiant power per area S with S ≤ 3230 W / cm². 2 exposed. It should be noted that the pulse dose, micropulses, duty cycle, firing rate and repetitions are preferably flexible and that these parameters can be adjusted accordingly depending on the type of given substrate material or coating precursor material in order to ensure curing of the coating precursor material and to avoid lens deformation.

[0062] Fig. 2 shows an absorption spectrum 28 of the liquid coating precursor material 12 applied to the lens substrate body 14. Fig. 2 also shows an absorption spectrum 30 of the lens substrate body material 14 and an absorption spectrum 31 of the lens substrate body material 14 with the coating precursor material 12 applied to it. As can be seen in Fig. 2, the absorption spectrum 28 of the coating precursor material 12 on the lens substrate body 14 and the absorption spectrum 30 of the lens substrate body material 12 overlap with the emission spectrum 26 of the xenon flash lamp 22. As a result, the radiant energy of the xenon flash lamp 22 is converted into heat in the coating precursor material 12 and in the lens substrate body 14.The lens substrate body 12 is then heated with energy from the electromagnetic radiation of the xenon flash lamp 22, which causes thermal hardening of the coating precursor material.

[0063] By applying electromagnetic radiation to the coating precursor material on the lens substrate body, which is generated by means of the xenon flash lamp 22, radiant energy from this electromagnetic radiation can be introduced into both the coating precursor material 12 on the lens substrate body 14 and into the material of the lens substrate body 12.

[0064] When the coating precursor material applied to the lens substrate body 14 is irradiated with light from the xenon flash lamp 22, the lens substrate body 14 heats up. This heating of the lens substrate body 14 can cause the material of the lens substrate body 14 to soften. At the same time, the coating precursor material undergoes a volume reduction and shrinks during curing.

[0065] Figure 4 shows a deformation of a lens 10 caused by a coating 12' in a treatment process. This deformation is caused by the shrinkage of the coating precursor material as it cures. The shrinkage of the coating precursor material 12 causes tensile forces to be introduced into the lens substrate 14 at the interface between the lens substrate body 14 and the coating 12' produced by the conversion of the coating precursor material 12 on the lens substrate body 14. These tensile forces act tangentially on the convexly curved interface of the lens substrate body 14 and result in the lens substrate body 14 deforming as the plastic-glass material of the lens substrate body 14 softens.

[0066] In this case, the direction of the clamping forces causes the curvature of the lens substrate body 14 to decrease, whereby the height h of the vertex 32 is reduced by the amount Ah to a height h'. By further tempering the lens substrate body with the cured coating 12', the clamping forces at the interface of the lens substrate body 14 can be reduced. This reduction of clamping forces then results in the lens substrate body 14 permanently retaining the deformed shape if the deformation caused by the clamping forces, due to the softening of the plastic material as a result of heating, was plastic and not elastic.

[0067] Therefore, if a lens substrate assumes a flat shape due to the shrinkage force of a coating during curing, this deformation is permanent. It is not reversed by the reduction of tensile forces at the interface between the lens substrate and the coating on the lens substrate.

[0068] The plastic-glass material of the lens substrate body 14 is a polymer exhibiting viscoelastic properties. The invention exploits the fact that relaxation of the polymer chains in the plastic-glass material is time- and temperature-dependent. The longer the time or the higher the temperature, the easier the relaxation of the network.

[0069] The photonic curing of the coating precursor material 12 on the lens substrate body 14, effected by means of the xenon flash lamp 22, is based on a photonic process triggered by the electromagnetic radiation 24 of the xenon flash lamp 22, which takes place within a time interval with a duration At < 300 s.

[0070] Although the temperature T of the lens substrate body 14 during photonic curing in the time interval causes the material of the lens substrate body 14 to be soft on the side facing the coating precursor material 12, the network of polymer chains in the material of the lens substrate body 14 is only slightly altered by forces introduced from the coating precursor material 12 into the lens substrate body due to the considerable viscosity of the material of the lens substrate body at the temperature of photonic curing.

[0071] The reason for this is that the temperature of the lens substrate body on the surface of the back side, which faces away from the surface of the lens substrate body 14 where the coating precursor material is located, is lower than on the surface to which the coating precursor material is applied. This creates a temperature gradient from the coated surface of the lens substrate body 14 to its back side, which results in the softness of the lens substrate body 14 material decreasing from the surface where the coating precursor material 12 is located to the side of the lens substrate body 14 facing away from this surface. Consequently, the shrinkage force is insufficient to deform the lens substrate body 14.

[0072] The result is that the lens substrate body 14 is dimensionally stable during the photonic curing of the coating precursor material 12, unlike curing in a tempering oven, which requires much more time.

[0073] The invention selects the treatment process such that the relative deformation Ah / h of the lens substrate body 14 remains below a predetermined threshold. This minimizes the plastic deformation of the lens substrate body 14 caused by tensile forces at the interface between the lens substrate body 14 and the coating 12' on the lens substrate body 14.

[0074] Figure 5 illustrates the invention. It shows the storage modulus Sm of the lens substrate body 14 for the materials MR10, MR7, MR8, Tribrid, CR39, polycarbonate and Trivex as a function of temperature T.

[0075] The storage modulus Sm describes the proportion of deformation work that is stored in the lens substrate body 14 after a force is applied and that can be released again as elastic deformation work after the force is removed. Figure 5 shows that above a temperature T, which depends on the material of the lens substrate body 14, the introduction of a force into the lens substrate body 14 causes a substantially plastic deformation of the lens substrate body 14.

[0076] Fig. 6 shows a relative deformation Ah / h in the form of a changed height of the vertex 32 of a coated lens for different thicknesses DL of a lens substrate body 14 for different glass materials and different layer thicknesses ds of the coating precursor material applied to the lens body 14 after a residence or curing time t = 1 h in a tempering oven at a temperature T < 110°C. It should be noted that thermal curing of coating precursor material on a lens substrate body in a tempering oven can also take place at, for example, 85°C or, for example, 100°C.

[0077] In Fig. 7, a relative deformation Ah / h of the lens substrate body 14 of a coated lens is applied for different thicknesses ds of a coating and for different thicknesses DL of a lens substrate body 14 as well as glass materials of the lens substrate body 14 in an identical treatment process.

[0078] Based on the relationships they determined and shown in Figures 5 to 7, the inventors recognized that if the irradiation in the treatment process takes place within a time interval of which length ta is: ta < 300s, where the irradiation causes photonic hardening of the coating precursor material 12 on the lens substrate body 14 by irradiation, and the material of the lens substrate body 14 is soft at least on the side facing the coating precursor material, the relative deformation Ah / h of the lens substrate body 14 in the treatment process is negligible, and there are no noticeable effects on the optical properties of a spectacle lens 10 that is made from the lens substrate body 14 with the coating precursor material 12.

[0079] The inventors also recognized from the relationships shown in Figs. 5 to 7 that if the minimum thickness DL of the lens substrate body is DI > 2.5 mm, the relative deformation Ah / h of the lens substrate body 14 in the treatment process is negligible and has no effect on the optical properties of a spectacle lens made from the lens substrate body 14 with the coating precursor material 16.

[0080] Finally, the inventors recognized from the relationships shown in Figs. 5 to 7 that for lens substrate bodies 14 with a thickness DL > 0.9 mm, the relative deformation Ah / h of the lens substrate body 14 in the treatment process is negligible and has no effect on the optical properties of a spectacle lens if the coating pre-material applied to at least one surface has a layer thickness ds for which: ds < 3 pm.

[0081] Furthermore, the inventors have recognized from the relationships shown in Figures 5 to 7 that the relative deformation Ah / h of the lens substrate body 14 in the treatment process is negligible and has no effect on the optical properties of a spectacle lens if the treatment process includes, as a treatment step, photonic hardening of the coating precursor material by irradiation on the lens substrate body 14, thermal hardening of the coating precursor material 12 by irradiation on the lens substrate body 14, or annealing of the lens substrate body 14 with the coating precursor material 12 over a time interval for which the length ta is: ta > 300 s, wherein the storage modulus of the material of the lens substrate body 14 is: Sm > 1000 MPa, preferably Sm > 1500 MPa.

[0082] Finally, the inventors derived from the designs shown in Figs. 5 to 6.The relationships shown in Figure 7 show that the relative deformation Ah / h of the lens substrate body 14 in the treatment process is negligible and has no effect on the optical properties of a spectacle lens if the treatment process includes, as a treatment step, photonic hardening of the coating precursor material 12 by irradiation on the lens substrate body 14, thermal hardening of the coating precursor material 12 by irradiation on the lens substrate body 14, or annealing of the lens substrate body 14 with the coating precursor material 12 over a time interval for which the length ta is: ta > 300 s, where the storage modulus Sm of the plastic-glass material of the lens substrate body 14 is: Sm < 1500 MPa, where the coating precursor material 12 applied to at least one surface has a layer thickness ds that is such that it is reduced to the minimum thickness DL of the lens substrate body 14. has been agreed upon.

[0083] In summary, the following preferred features of the invention are particularly noteworthy: The invention relates to a method for manufacturing a coated lens 10, wherein the method comprises at least the following steps:

[0084] Applying a coating precursor material 12 to a surface of an uncoated or precoated lens substrate body 14 and applying electromagnetic radiation to the coating precursor material 12 on the lens substrate body 14 to cure the coating precursor material 12, wherein the material of the lens substrate body 14 at least partially absorbs the electromagnetic radiation.The electromagnetic radiation 24 is applied to the coating precursor material 12 for an irradiation time ts such that the lens substrate body 14 heats up, at least on one side facing the applied coating precursor material 12, to a temperature TH for photonic hardening at which the coating precursor material 14 and the material of the lens substrate body 12 bond. The intensity of the electromagnetic radiation 24 and the irradiation time ts are selected such that, during treatment, a shear force introduced into the lens substrate body 14 from the coating precursor material 12 causes only a deformation of the lens substrate body 14 that is below a predetermined limit value G. Reference numeral list:

[0085] 10 Carrier device

[0086] 12 Coating precursor material

[0087] 12' cured coating precursor material

[0088] 14 lens substrate bodies

[0089] 16 coating stations

[0090] 18 dosing units

[0091] 20 treatment stations

[0092] 22 Xenon flash lamp

[0093] 23 Puls

[0094] 24 electromagnetic radiation

[0095] 25 micropulses

[0096] 26 Emission spectrum

[0097] 28 Absorption spectrum of coating precursor material

[0098] 30 Absorption spectrum Material Lens substrate body

[0099] 31 Absorption spectrum Material lens substrate body with

[0100] Coating precursor material

[0101] 32 Vertex

Claims

- 23 - Patent claims 1. Method for manufacturing a coated lens (10), wherein the method comprises at least: Applying a coating precursor material (12) to a surface of one side of an uncoated or precoated lens substrate body (14) and Applying electromagnetic radiation to the coating precursor material (12) on the lens substrate body (14) to cure the coating precursor material, wherein the material of the lens substrate body (14) at least partially absorbs the electromagnetic radiation (24), characterized in that the electromagnetic radiation (24) is applied to the coating precursor material (12) for an irradiation time ts such that the lens substrate body (14) heats up at least on one side facing the applied coating precursor material (12) to a temperature TH for photonic curing at which the coating precursor material (12) and the material of the lens substrate body (14) bond, wherein the intensity of the electromagnetic radiation (24) and the irradiation time ts are selected such thatthat during treatment, a shear force introduced into the lens substrate body (14) from the coating precursor material (12) only causes a deformation of the lens substrate body (14) that is below a predetermined limit value G.

2. Method according to claim 1, characterized in that the wavelength of the electromagnetic radiation lies at least partially in the ultraviolet spectral range.

3. Method according to claim 1 or 2, characterized in that the predetermined limit value G is a limit value from the group relative height change Ah / h of a vertex (32) of the lens substrate body (14) and / or relative change Akl / kl of a local curvature of the lens substrate body (14) and / or relative mean curvature Akm / km of the lens substrate body (14) and / or relative refractive power change ABK / BK.

4. Method according to claim 3, characterized in that the limit value G is: G < 25%, preferably G < 10%, preferably G < 5%, particularly preferably G < 1%.

5. Method according to one of claims 1 to 4, characterized in that the irradiation time ts is: ts < 300s.

6. Method according to any one of claims 1 to 5, characterized in that the material of the lens substrate body (14) is a material from the group consisting of polyallyldiglycol carbonate ((P)ADC), polyurethane, polycarbonate.

7. Method according to claim 6, characterized in that the material of the lens substrate body (14) is a material with the trade name CR-39, CR-330, CR-607, CR-630, RAV 700, RAV 7NG, RAV 7AT, RAV 710, RAV 713, RAV 720, RAVolution, Trivex, Panlite, Lexan, Makrolon, MR10, MR7, MR8 or Tribrid.

8. Method according to one of claims 1 to 7, characterized in that the electromagnetic radiation (24) is provided by means of a xenon lamp (22).

9. Method according to claim 8, characterized in that the electromagnetic radiation (24) is pulsed.

10. Method according to any one of claims 1 to 9, characterized in that the electromagnetic radiation (24) has a mean irradiance I in the range of 1000 mW / cm² 2 < I < 35000 mW / cm 2 , preferably in the range of 2000 mW / cm² 2 < I < 30000 mW / cm 2 is applied to the surface of the coating precursor material (12).

11. Method according to one of claims 1 to 10, characterized in that the following applies to the radiation energy SE applied through the surface of the coating precursor material (12): 25 J / cm2 < SE < 500 J / cm2.

12. Method according to any one of claims 1 to 11, characterized in that the electromagnetic radiation (24) has a spectral intensity distribution (26), wherein the material of the lens substrate body (14) or the coating precursor material (12) has at least one absorption band overlapping with the spectral intensity distribution, such that the material of the lens substrate body (14) or the coating precursor material (12) at least partially absorbs the electromagnetic radiation (24).

13. Method according to claim 12, characterized in that the electromagnetic radiation (24) has a spectral intensity distribution (26) extending into the ultraviolet spectral range, wherein the material of the lens substrate body (14) or the coating precursor material (12) absorbs the electromagnetic radiation (24) at least partially in the ultraviolet spectral range.

14. Method according to claim 13, characterized in that the coating precursor material (12) contains a photoinitiator.

15. Method according to any one of claims 1 to 14, characterized in that the minimum thickness DL of the lens substrate body (14) is: DL < 2.5mm.

16. Method according to any one of claims 1 to 15, characterized in that the coating precursor material (12) applied to at least one surface has a layer thickness ds for which: ds >

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