Carl Zeiss Vision International

The application relates to a method for calibrating an apparatus (10) for the additive production of an optical element, in particular a spectacle lens, in a printing process by applying droplets of printing ink (23), the apparatus (10) comprising a print head (12) with a print head nozzle arrangement (26) which has a plurality of print head nozzles (30.n.m) for producing droplets of printing ink (23). According to the invention, a mean droplet volume Vm of the printing ink droplets (23) is determined as a calibration variable of the apparatus (10) for additive manufacturing of the optical element. The invention also relates to the manufacture of an optical element, in particular an optical element from the group consisting of a lens, intraocular lens, contact lens, spectacle lens and an apparatus (10) for the manufacture of an optical element, in particular a spectacle lens.

A method of anomaly detection for a lens and a corresponding apparatus is provided. The detecting of an anomaly is based on a plurality of images of the lens illuminated with a pattern that is periodic in a modulation direction, wherein the pattern is phase-shifted from image to image. Phase progression rate for a plurality of positions on the lens are determined based on the plurality of images, and the anomaly is detected based on deviations between the phase progression rate for different positions on the lens.

The invention relates to a method of manufacturing a spectacle lens (80), in which a plurality of stacked volume layers VLi, i = 1, 2, 3, ... is generated, each of which is produced from a specific volume layer starting material Mi, i = 1, 2, 3, ... which contains at least one reactive component. According to the invention, the volumetric layer starting material Mi of each volumetric layer VLi, i = 1, 2, 3, ... is subjected to free radical polymerization by means of UV radiation prior to application of the overlying volumetric layer VLi+1, i = 1, 2, 3, ... by means of UV radiation for radical polymerization of the at least one reactive component in the presence of a inhibitor present on a surface of the volume layer starting material Mi in such a way that a volume layer VSi and a surface layer OFSi complementary to the volume layer VSi are formed in the volume layer VLi with the volume layer starting material Mi, wherein in the volume layer VSi , i = 1, 2, 3, ... the cure level of the at least one reactive component assumes at least the value PVSi, i = 1, 2, 3, ... and wherein the following applies to the cure level POFSi, i = 1, 2, 3, ... in the surface layer OFSi: POFSi < PVSi. By applying a volume layer VLi+1, i = 1, 2, 3, ... on the volume layer VLi, i = 1, 2, 3, ... after treating the volume layer starting material Mi therein, the volume layer starting material Mi+1 of the volume layer VLi+1, i = 1, 2, 3, ... is at least partially mixed with the volume layer starting material Mi of the volume layer VLi, i = 1, 2, 3, ... in the surface layer OFSi, i = 1, 2, 3, .... In a transition zone TZi,i+1, i = 1, 2, 3, ... extending from the surface layer OFSi, i = 1, 2, 3, ... of the volume layer VLi, i = 1, 2, 3, ... into the volume layer VLi+1, the volume layer starting material Mi+1 of the volume layer VLi+1 is at least partially mixed with the volume layer starting material Mi of the volume layer VLi in the surface layer OFSi. The mixing is done in such a way that starting from the volume layer VSi the concentration CMi of the volume layer starting material Mi decreases continuously through the surface layer OFSi, i = 1, 2, 3, ... up into the transition zone TZi,i+1 down to a minimum and starting from the volume layer VSi+1 the concentration CMi+1 of the volume layer starting material Mi+1 decreases continuously through the transition zone TZi,i+1, i = 1, 2, 3, ... up into the surface layer OFSi, i = 1, 2, 3, ... down to a minimum.

Provided is a method for dip coating an ophthalmic lens. The method comprises providing a coating device comprising a process volume containing a lacquer mixture, dipping the ophthalmic lens into the process volume of the coating device such that the ophthalmic lens is entirely immersed in the stream of the lacquer mixture, and removing the ophthalmic lens from the process volume and curing the lacquer mixture adhering to the ophthalmic lens. The method further comprises adjusting the lacquer mixture prior to dipping the ophthalmic lens into the process volume such that the lacquer mixture meets one or more or all of the following conditions at a pressure of 1,01325 bar: - a viscosity of the lacquer mixture (14) is in a range from 0,587 mPa·s to 200 mPa·s at a temperature of 20° C; - a surface tension of the lacquer mixture (14) is in a range from 22,6 mN/m to 150 mN/m at a temperature of 20° C; - a density of the lacquer mixture (14) is in a range from 0,787 kg/m3 to 1.280 kg/m3 at a temperature of 20° C; - a volume flow of the lacquer mixture (14) fed into the process volume is in a range from 1 L/min to 15 L/min; and - a temperature of the lacquer mixture (14) used in the process volume is in a range from 8° C to 28° C.

The present invention relates to a spectacle lens comprising an anti-reflective coating, the anti-reflective reflective coating as defined in ISO 13666:2019(E), entry 3.18.3, said anti-reflective coating comprising a plurality of layers, said spectacle lens having, in an interval of angles of incidence, a residual reflectance colour in CIE 1976 L*a*b* colour space, the spectacle lens being characterized in that at an angle of incidence of 0°, positions of CIELAB a*,b* coordinates for said residual reflectance colour lie in a rectangular region in an a*,b* plane, said rectangular region in said a*,b* plane being defined by 2 ≤ a* ≤ 9.2 and 7 ≤ b* ≤ 16.8, in an interval of angles of incidence limited by an angle of incidence of > 0° and an angle of incidence of 75°, each position of CIELAB a*, b* coordinates for said residual reflectance colour, in said a*,b* plane, has a value D ≥ 0, with D = b* + 6.5 · a* + 6.5, the CIELAB a*,b* coordinates are determined with respect to a single surface of said spectacle lens comprising said anti-reflective coating.

The present invention relates to a spectacle lens comprising an anti-reflective coating, said anti-reflective coating being a single layer anti-reflective coating, said spectacle lens having a spectral reflectance of < 1.5% at an angle of incidence of 0° in a wavelength interval of from a wavelength λ₁ to a wavelength λ₂, the spectacle lens being characterized in thatsaid wavelength interval of from said wavelength λ₁ to said wavelength λ₂ extends over one of the following widths w, w = λ₂ - λ₁,- a width of at least 1200 nm,- a width of at least 1300 nm,- a width of at least 1400 nm,with 380 nm ≤ λ₁, λ₂ ≤ 2500 nm, λ₁ ≠ λ₂, λ₂ > λ₁.

The present invention is directed to a computer-implemented method for generating printing instructions for inkjet printing a spectacle lens, said printing instructions being based on a digital twin of said spectacle lens, said digital twin being sliced into a layer stack, the method comprising the steps:(i) positioning a volume element in a discrete x_m+1,y_m+1,z_m+1 ... x_n+1,y_n+1,z_n+1 position of a layer of said layer stack, based on a positioning of a volume element in a discrete x_m,y_m,z_m ... x_n,y_n,z_n position of an adjacent layer of said layer stack; or(ii) not positioning a volume element in a discrete x_m+1,y_m+1,z_m+1 ... x_n+1,y_n+1,z_n+1 position of a layer of said layer stack, based on a positioning of a volume element in a discrete x_m,y_m,z_m ... x_n,y_n,z_n position of an adjacent layer of said layer stack.

A method for manufacturing at least one spectacle lens, the method comprising:a) providing at least one spectacle lens, wherein the at least one spectacle lens is subject to undergo at least one manufacturing step being performed by at least one manufacturing machine configured for performing the at least one manufacturing step;b) generating, by using a measurement system, at least one item of information on at least one property of the at least one spectacle lens, wherein the item of information on the at least one property of the at least one spectacle lens relates to actual measurement data determined by the measurement system through measuring the at least one spectacle lens;c) applying the item of information on the at least one property of the at least one spectacle lens to a surface of the at least one spectacle lens;d) performing the at least one manufacturing step on the at least one spectacle lens depending on the item of information on the at least one property of the at least one spectacle lens by using the at least one manufacturing machine.Furthermore, a corresponding system for manufacturing at least one spectacle lens and a corresponding spectacle lens is disclosed.

A computer-implemented method (100, 200, 300) configured to control a coating apparatus (3), the coating apparatus (3) being configured to vapor deposit a layer (51, 52) of a coating (5) onto a spectacle lens (4) by electron beam evaporation, characterized in that the method comprises automated determining (201) of an initial strength of an emission current of a current cycle of applying the coating (5) onto the spectacle lens (4) as a function of a strength of an emission current used during a previous cycle of applying the coating (5) onto the spectacle lens (4).

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