EP4070137A1 - Filtre angulaire - Google Patents
Filtre angulaireInfo
- Publication number
- EP4070137A1 EP4070137A1 EP20815886.5A EP20815886A EP4070137A1 EP 4070137 A1 EP4070137 A1 EP 4070137A1 EP 20815886 A EP20815886 A EP 20815886A EP 4070137 A1 EP4070137 A1 EP 4070137A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lenses
- array
- angular filter
- filter according
- openings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0018—Reflow, i.e. characterized by the step of melting microstructures to form curved surfaces, e.g. manufacturing of moulds and surfaces for transfer etching
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
Definitions
- the present description relates to an angular optical filter.
- an angular filter intended to be used within an optical system, for example, an imaging system or to be used to collimate the rays of a light source (directional illumination by organic light emitting diode (OLED) and optical inspection).
- OLED organic light emitting diode
- An angular filter is a device making it possible to filter incident radiation as a function of the incidence of this radiation and thus block the rays whose incidence is greater than a desired angle, called maximum incidence.
- Angular filters are frequently used in conjunction with image sensors.
- an angular filter comprising: a first array of plano-convex lenses; a second array of plano-convex lenses located between the first array of lenses and an image sensor; and a matrix of apertures, the plane faces of the lenses of the first array and of the second array facing each other and the number of lenses of the second array being greater than the number of lenses of the first array.
- One embodiment provides for an angular filter comprising a first and a second array of planonvex lenses and a matrix of apertures, the plane faces of the lenses of the first array and of the second array facing each other.
- the matrix of openings is formed in a layer of a first opaque resin, in the visible and infrared domains.
- the openings of the matrix are filled with air or with a material that is at least partially transparent in the visible and infrared domains.
- the optical axis of each lens of the first array is aligned with the optical axis of a lens of the second array and the center of an opening of the array.
- each opening of the matrix is associated with a single lens of the first network.
- the image focal planes of the lenses of the first array are merged with the object focal planes of the lenses of the second array.
- the number of lenses of the second network is greater than the number of lenses of the first network.
- the lenses of the first network have a diameter greater than that of the lenses of the second network.
- the array of openings is located between the first array of lenses and the second array of lenses.
- the second lens array is located between the first lens array and the aperture matrix.
- the lenses of the first network are on and in contact with a substrate.
- One embodiment provides a method of manufacturing an angular filter comprising, among others, the following steps: depositing a film of a second photosensitive resin; making by photolithography, spots of second resin; and heating said pads in order to modify their geometry, and thus form the lenses of the second network.
- the exposure by lithography is carried out through the lenses of the first network.
- the second lens array is formed by molding.
- the two arrays of lenses are produced separately and then assembled using an adhesive film.
- Figure 1 illustrates, in a sectional view, an embodiment of an image acquisition system
- FIG. 2 illustrates, in a sectional view, a step of a first embodiment of a method for manufacturing an angular filter
- Figure 3 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 4 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 5 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 6 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 7 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 8 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment
- FIG. 9 illustrates, in a sectional view, a step of a second embodiment of a method for manufacturing an angular filter
- FIG. 10 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 11 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 12 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 13 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 14 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 15 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment
- FIG. 16 illustrates, in a sectional view, a step of a third embodiment of a method for manufacturing an angular filter
- FIG. 17 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment
- Figure 18 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment
- FIG. 19 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment
- Figure 20 illustrates, in a sectional view, a variant of the steps of Figures 18 and 19;
- FIG. 21 illustrates, in a sectional view, a step of a fourth embodiment of a method for manufacturing an angular filter
- FIG. 22 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the fourth embodiment
- FIG. 23 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the fourth embodiment.
- Figure 24 illustrates, in a sectional view, a variant of the step of Figure 23.
- a layer or a film is said to be opaque to radiation when the transmittance of the radiation through the layer or the film is less than 10%.
- a layer or a film is said to be transparent to radiation when the transmittance of the radiation through the layer or the film is greater than 10%.
- all the elements of the optical system which are opaque to radiation have a transmittance which is less than half, preferably less than a fifth, more preferably less than a tenth, of the highest transmittance. lower of the elements of the optical system transparent to said radiation.
- the electromagnetic radiation passing through the optical system in operation is called “useful radiation”.
- optical element of micrometric size an optical element formed on one face of a support, the maximum dimension of which, measured parallel to said face, is greater than 1 ⁇ m and less than 1 mm.
- a film or a layer is said to be impervious to oxygen when the permeability of the film or of the layer to oxygen at 40 ° C. is less than 1.10 _1 cm 3 / (m 2 * day) .
- the oxygen permeability can be measured according to the ASTM D3985 method entitled "Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Sheeting Using a Coulometric Sensor".
- a film or a layer is said to be waterproof when the permeability of the film or of the layer to water at 40 ° C. is less than 1.10 _1 g / (m 2 * day).
- the water permeability can be measured according to the ASTM F1249 method entitled "Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor".
- Embodiments of optical systems will now be described for optical systems comprising a matrix of micrometric-sized optical elements in the case where each micrometric-sized optical element corresponds to a micrometric-sized lens, or microlens composed of two dioptres.
- each optical element of micrometric size can also be implemented with other types of optical elements of micrometric size, each optical element of micrometric size being able to correspond, for example, to a Fresnel lens of micrometric size, to a lens with a gradient index of micrometric size or to a diffraction grating of micrometric size.
- visible light is called electromagnetic radiation, the length of which wave is between 400 nm and 700 nm and infrared radiation is electromagnetic radiation whose wavelength is between 700 nm and 1 mm.
- infrared radiation a distinction is made in particular between near infrared radiation, the wavelength of which is between 700 nm and 1.7 ⁇ m.
- a manufacturing step is assimilated to the structure obtained at the end of this step.
- FIG. 1 illustrates, in a sectional view, an embodiment of an image acquisition system 1.
- the acquisition system 1 shown in Figure 1 comprises, from bottom to top in the orientation of the figure, an image sensor 11 and an angular filter 13.
- the image sensor 11 comprises a matrix of photon sensors 111, also called photodetectors.
- the photodetectors 111 can be covered with a protective coating, not shown.
- the photodetectors 111 can be made of organic materials.
- the photodetectors 111 can correspond to organic photodiodes (OPD, Organic Photodiode), to organic photoresistors, to amorphous or monocrystalline silicon photodiodes associated with a matrix of TFT (Thin Film Transistor) or CMOS (Complementary Metal Oxide Semiconductor) transistors.
- OPD Organic Photodiode
- TFT Thin Film Transistor
- CMOS Complementary Metal Oxide Semiconductor
- the acquisition system 1 further comprises units, not shown, for processing the signals supplied by the image sensor 11, comprising for example a microprocessor.
- the angular filter 13 comprises, from top to bottom, in the orientation of Figure 1: a first array of plano-convex lenses 131; a first substrate or support 133; a first layer 135 of openings or holes 137; a second layer 139 which may comprise a planarization layer and / or another substrate and / or an adhesive film; and a second array of plano-convex lenses 141 serving for the collimation of the light transmitted by the filter, the plane faces of the lenses 141 facing the plane faces of the lenses 131.
- the flat faces of the lenses 131 of the first network and the flat faces of the lenses 141 of the second network face each other.
- the diameter of the lenses 131 of the first network is preferably greater than the diameter of the lenses 141 of the second network.
- Each opening 137 is preferably associated with a single lens 131 of the first array.
- the optical axes 143 of the lenses 131 are preferably aligned with the centers of the openings 137 of the first layer 135.
- the diameter of the lenses 131 of the first array is preferably greater than the maximum section (measured perpendicular to the axes 143). openings 137.
- the number of lenses 131 of the first array is equal to the number of lenses 141 of the second array.
- the lenses 131 of the first array and the lenses 141 of the second array are aligned by their optical axes 143.
- the number of lenses 141 of the second network is greater than the number of lenses 131 of the first network.
- each photodetector 111 is shown associated with a single opening 137, the center of each photodetector 111 being centered with the center of the opening 137 with which it is associated.
- the resolution of the angular filter 13 is at least twice the resolution of the image sensor 11.
- the system 1 has at least twice as many lenses 131 (or apertures 137) as it does.
- photodetectors 111 is associated with at least two lenses 131 (or apertures 137).
- the angular filter 13 is adapted to filter the incident radiation as a function of the incidence of the radiation with respect to the optical axes 143 of the lenses 131 of the first network.
- the angular filter 13 is adapted so that each photodetector 111 of the image sensor 11 receives only the rays whose respective incidences, with respect to the respective optical axes 143 of the lenses 131 associated with the photodetectors 111, are less than an angle of incidence maximum less than 45 °, preferably less than 30 °, more preferably less than 10 °, even more preferably less than 4 °.
- the angular filter 13 is adapted to block the rays of the incident radiation, the respective incidences of which with respect to the optical axes 143 of the lenses 131 of the filter 13 are greater than the maximum angle of incidence.
- the rays emerge, from the lenses 131 and from the layer 135, with an angle with respect to the respective direction of the rays incident to the lenses 131.
- the angle is specific to a lens 131 and depends on the diameter of the latter and the focal length of this same lens 131.
- the rays pass through the layer 139 then meet the lenses 141 of the second network.
- the rays are thus deflected, at the output of the lenses 141, by an angle b with respect to the respective directions of the rays incident to the lenses 141.
- the angle b is specific to a lens 141 and depends on the diameter of the latter and the distance focal length of this same lens 141.
- the total angle of divergence corresponds to the deviations generated successively by the lenses 131 and by the lenses 141.
- the lenses 141 of the second network are chosen so that the total angle of divergence is, for example, less than or equal to about 5 °.
- FIG. 1 illustrates an ideal configuration in which the image focal planes of the lenses 131 of the first array coincide with the object focal planes of the lenses 141 of the second array.
- the rays shown, arriving parallel to the optical axis, are focused at the image focal point of the lens 131 or object focal point of the lens 141.
- the rays which emerge from the lens 141 thus propagate parallel to the optical axis of the latter.
- the total divergence angle is, in this case, zero.
- Figures 2 to 8 illustrate, schematically and partially, successive steps of an example of a method of manufacturing an angular filter according to a first embodiment.
- FIG. 2 illustrates, in a sectional view, a step of the first embodiment of the method for manufacturing an angular filter.
- FIG. 2 partially and schematically represents a starting structure or stack 21 of the first array of lenses or microlenses 131 and of the first substrate 133.
- the substrate 133 can be made of a transparent polymer which does not absorb at least the wavelengths considered, here in the visible and infrared range.
- This polymer can in particular be made of poly (ethylene terephthalate) PET, poly (methyl methacrylate) PMMA, cyclic olefin polymer (COP), polyimide (PI), polycarbonate (PC).
- the thickness of the substrate 133 can, for example, vary from 1 to 100 ⁇ m, preferably between 10 and 100 ⁇ m.
- the substrate 133 can correspond to a colored filter, a polarizer, a half-wave plate or a quarter-wave plate.
- the microlenses 131, on and in contact with the substrate 133, can be made of silica, of PMMA, of a positive photosensitive resin, of PET, of poly (ethylene naphthalate) (PEN), of COP, of polydimethylsiloxane
- the microlenses 131 can be formed by creeping blocks of a photosensitive resin.
- the microlenses 131 can further be formed by molding on a layer of PET, PEN, COP, PDMS / silicone, epoxy resin or acrylate resin.
- the microlenses 131 are convergent lenses each having a focal length f of between 1 ⁇ m and 100 ⁇ m, preferably between 1 ⁇ m and 70 ⁇ m. According to one embodiment, all the microlenses 131 are substantially identical.
- the upper face of the structure in the orientation of Figure 2, is considered to be the front face and the lower face of the structure, in the orientation of Figure 2, as the back side.
- FIG. 3 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- Figure 3 illustrates by a view, partial and schematic, a step of forming the layer 135 of a first resin 145, comprising the matrix of openings 137, on the rear face of the structure obtained from the outcome of the step in Figure 2.
- the layer 135 is, for example, opaque. to the radiation detected by the photodetectors (111, FIG. 1), for example absorbent and / or reflective with respect to the radiation detected by the photodetectors.
- the layer 135 absorbs in the visible and / or the near infrared and / or the infrared.
- Layer 135 can be opaque to radiation, between 450 nm and 570 nm, used for imaging (biometrics and fingerprint imaging).
- the openings 137 are shown with a cross section, by a sectional view, trapezoidal.
- the cross section of the openings 137, in a sectional view can be square, triangular or rectangular.
- the cross section of the openings 137 in the top view may be circular, oval or polygonal, for example triangular, square, rectangular, trapezoidal or in the shape of a funnel.
- the cross section of the openings 137 in the top view is preferably circular.
- the openings 137 are arranged in rows and in columns.
- the openings 137 can have substantially the same dimensions.
- the diameter of the openings 137 (measured at the base of the openings, that is to say at the interface with the substrate 133) is called “wl”.
- the openings 137 are arranged regularly according to the rows and according to the columns.
- the repetition pitch of the holes 137 is called "p", that is to say the distance in top view between the centers of two successive holes 137 of a row or of a column.
- the openings 137 are preferably made so that each microlens 131 is facing a single opening 137 and each opening 137 is overhung by a single microlens 137.
- the center of a microlens 131 is, for example, aligned with the center of the opening 137 associated with it.
- the diameter of each lens 131 is, preferably greater than the diameter w1 of each opening 137 with which the lens 131 is associated.
- the pitch p can be between 5 ⁇ m and 50 ⁇ m, for example equal to approximately 15 ⁇ m.
- the height h may be between 1 ⁇ m and 1 mm, preferably, be between 12 ⁇ m and 15 ⁇ m.
- the width w1 can, preferably, be between 5 ⁇ m and 50 ⁇ m, for example be equal to approximately 10 ⁇ m.
- An embodiment of a method of manufacturing the layer 135 comprising the opening matrix 137 comprises the following steps: depositing the layer 135 of the first resin 145, on the rear face of the substrate 133, by centrifugation or coating; making the openings 137 in the layer 135 by exposing the first resin 145 (photolithography), via its front face, with light collimated through the mask formed by the array of microlenses 131; and developing, removing the exposed portions of the resin 145.
- the microlenses 131 and the substrate 133 are preferably made of transparent or partially transparent materials, that is to say transparent in a part of the spectrum considered for the target area, by example, imaging, over the range of wavelengths corresponding to the wavelengths used during the exposure.
- Another embodiment of a method for manufacturing the layer 135, comprising the matrix of openings 137 comprises the following steps: depositing the layer 135 of the first resin 145, on the rear face of the substrate 133, by centrifugation or coating; making the openings 137 in the layer 135 by exposing the resin 145, via its rear face, with light collimated through a mask; and developing the exposed portions of the resin 145 by development.
- This embodiment requires prior alignment of the openings, drawn on the mask, with the lenses 131 in order to form the openings 137 aligned with the lenses 131.
- this alignment is achieved by means of alignment marks (preferably at least four alignment marks) distributed over the entire surface of the structure.
- Another embodiment of a method for manufacturing the layer 135, comprising the matrix of openings 137 comprises the following steps: forming, on the rear face of the substrate 133 and by photolithography steps, a mold of a transparent negative sacrificial resin (not shown in FIG. 3) of the desired shape of the openings 137; filling the mold with the first resin 145; and removing the sacrificial resin mold, for example by a "lift-off" process.
- An embodiment of a method of manufacturing the layer 135, comprising the matrix of openings 137 comprises the following steps: depositing the layer 135 of resin 145, on the rear face of the substrate 133, by coating or centrifugation; and perforating the resin layer 135 145 to form the openings 137.
- This embodiment requires prior alignment of the lenses 131 with the perforation tool in order to form the openings 137 aligned with the lenses 131.
- the perforation can be carried out using a micro-perforation tool comprising, for example, micro needles calibrated to obtain precise dimensions of the holes 137.
- the perforation of the layer 135 can be carried out by laser ablation.
- the resin 145 is a positive photosensitive resin, for example a colored or black DNQ-Novolac resin or a DUV (Deep Ultraviolet) photosensitive resin.
- DNQ-Novolak resins are based on a mixture of diazonaphthoquinone (DNQ) and a novolak resin (phenolformaldehyde resin).
- DUV resins can include polymers based on polyhydroxystyrenes.
- the resin 145 is a negative photosensitive resin.
- negative photosensitive resins are epoxy-based polymer resins, for example the resin marketed under the name SU-8, acrylate resins and non-stoichiometric thiol-enes polymers (OSTE, Off-Stoichiometry thiol-enes polymer ).
- the resin 145 is based on a laser machinable material, that is to say a material capable of degrading under the action of laser radiation. Examples of laser machinable materials are graphite, plastic materials such as PMMA, acrylonitrile butadiene styrene (ABS) or tinted plastic films such as PET, PEN, COPs and PIs.
- FIG. 4 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- FIG. 4 illustrates a partial and schematic view of a planarization step, by the deposition of a second layer 139, on the rear face of the structure obtained at the end of the steps of FIGS. 2 and 3.
- the openings 137 are filled with air or a filling material at least partially transparent to the radiation detected by the photodetectors (111, FIG. 1), for example PDMS, an epoxy or acrylate resin or a resin known under the trade name SU8.
- the openings 137 can be filled with a material which is partially absorbing, that is to say absorbing in a part of the spectrum considered for the target area, for example imaging, in order to chromatically filter the filtered rays. angularly by the angular filter 13.
- the rear face of the structure is covered with the full plate by the second layer 139. That is to say that the 'the first layer 135 is covered by the second layer 139.
- the lower face of the second layer 139 is, following this step, substantially flat.
- the openings 137 are thus filled by the second layer 139 if the step of filling the openings 137 has not been carried out beforehand.
- the material of the layer 139 is preferably at least partially transparent to the radiation detected by the photodetectors (111, FIG. 1), for example PDMS, an epoxy or acrylate resin or a resin known under the trade name SU8. .
- the filling material used during the optional filling of the openings 137 and the material of the layer 139 may be of the same composition or of different compositions.
- FIG. 5 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- FIG. 5 illustrates, in a partial and schematic view, a step of depositing a film 149 of a second resin 151, on the rear face of the structure obtained at the end of the steps of FIGS. 2 to 4.
- the rear face of the structure is completely covered (full plate), and in particular the layer 139 is covered with the film 149 of the second resin 151.
- the second resin 151 is, of preferably, positive.
- the thickness of the film is substantially constant over the entire structure.
- the thickness is, for example, between 1 ⁇ m and 20 ⁇ m, preferably between 12 ⁇ m and 15 ⁇ m.
- the layer 149 can be deposited on a support film (not shown) and then the whole of the layer 149 and of said film can be laminated on the structure obtained at the end of the steps of FIGS. 2 to 4.
- Layer 149 can be deposited according to this variant implementation from the end of the step illustrated in FIG. 3.
- FIG. 6 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- FIG. 6 illustrates, in a partial and schematic view, a step of removing part of the layer 149 to form pads 153 of second resin 151.
- the pads 153 are formed so that they have, for example, in top view, a square or circular shape, preferably circular.
- the pads have a diameter w2 comprised, for example, between 2 ⁇ m and the diameter of the lenses 131.
- the number of pads 153 preferably corresponds to the number of lenses 131 of the first array.
- An embodiment of a method for manufacturing the pads 153, from the layer 149 comprises the following steps: producing the pads 153 in the layer 149 by exposure of the second resin 151, by its front face, by light collimated through the mask formed by the array of microlenses 131 and the openings 137; and developing the unexposed portions of the resin 151 by development.
- the microlenses 131, the substrate 133 and the layer 139 are preferably made of transparent materials over the range of wavelengths corresponding to the wavelengths used during the exposure.
- Another embodiment of a method for manufacturing the pads 153, from the layer 151 comprises the following steps: making the pads 153 in the layer 149 by exposing the resin 151, by its rear face, by collimated light through a mask; and developing the unexposed portions of the resin 151 by development.
- This embodiment requires prior alignment of the pads 153 drawn on the mask with the lenses 131 (and the openings 137) in order to form the pads 153 aligned with the lenses 131 (and the openings 137).
- FIG. 7 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- FIG. 7 illustrates, in a partial and schematic view, a step of heating the structure obtained at the end of the steps of FIGS. 2 to 6.
- the structure is heated in order to deform the pads 153 of resin 151.
- the pads 153 are deformed by creep until they form them.
- lenses 141 The temperature, during this step, is, for example, between 100 and 200 ° C.
- the pads 153 are exposed to UV in order to deform them and form the lenses 141.
- the opening angle of the UV source makes it possible to modify the curvature of the lenses 141.
- the lenses 141 have a shape, for example, of a spherical or aspherical cap.
- FIG. 8 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the first embodiment.
- FIG. 8 illustrates, in a partial and schematic view, a step of depositing a third layer 155, on the rear face of the structure obtained at the end of the steps of FIGS. 2 to 7.
- the rear face of the structure is completely covered (full plate) and, in particular, the lenses 141 and the second layer 139 are covered by the third layer 155.
- the third layer 155 and the second layer 139 can be of the same composition or of different compositions.
- the third layer 155 preferably has an optical index lower than the optical index of the second resin 151.
- FIGS. 9 to 15 illustrate, schematically and partially, successive steps of an example of the method of manufacturing an angular filter according to a second embodiment.
- the second mode of implementation differs from the first mode of implementation in that the first array of lenses 131 is produced in contact with the substrate 133 and before formation of the first layer 135 comprising the matrix of openings 137 .
- FIG. 9 illustrates, in a sectional view, a step of the second embodiment of the method for manufacturing an angular filter.
- FIG. 9 illustrates by a view, partial and schematic, a starting structure identical to the starting structure of the method according to the first embodiment, shown in FIG. 2.
- FIG. 10 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIG. 10 illustrates by a view, partial and schematic, a step of depositing the film 149 of the first embodiment, on the rear face of the structure obtained at the end of the step of figure 9.
- This step is substantially identical to the step illustrated in FIG. 5 of the method according to the first embodiment, with the difference that, in the step illustrated in FIG. 10, the film 149 covers the substrate 133.
- FIG. 11 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIG. 12 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIGS. 11 and 12 illustrate, by partial and schematic views, a step of forming the second lens array 141, on the rear face of the structure obtained at the end of the step of FIG. 10, from film 149. These two steps are substantially identical to the steps illustrated respectively in Figures 6 and 7 of the method according to the first embodiment.
- FIG. 13 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIG. 13 illustrates by a view, partial and schematic, a step of depositing a third layer 155, of optical index lower than the optical index of the second resin 151, on the rear face. of the structure obtained at the end of the steps of FIGS. 9 to 12.
- the rear face of the structure is completely covered (full plate) and, in particular, the lenses 141 and the substrate 133 are covered with the third layer 155.
- FIG. 14 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIG. 15 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the second embodiment.
- FIGS. 14 and 15 illustrate, by partial and schematic views, a step of forming the first layer 135, comprising the matrix of openings 137, on the rear face of the structure obtained at the end. steps of Figures 9 to 13.
- steps are substantially identical to the step illustrated in FIG. 3 of the method according to the first embodiment, with the difference that the first layer 135 is produced on the third layer 155.
- steps can be followed by a step of depositing a second layer substantially identical to the step of depositing the second layer 139 of FIG. 7 of the method according to the first embodiment.
- FIGS. 16 to 19 schematically and partially illustrate successive steps of an example of the method of manufacturing an angular filter according to a third embodiment.
- the third mode of implementation differs from the first mode of implementation by the mode of manufacture of the second array of lenses 141.
- FIG. 16 illustrates, in a sectional view, a step of the third embodiment of the method for manufacturing an angular filter.
- FIG. 16 illustrates, in a partial and schematic view, a step of forming a structure substantially identical to the structure illustrated in FIG. 4 of the method according to the first embodiment.
- the structure illustrated in FIG. 16 therefore corresponds substantially to the result of the implementation of the steps of FIGS. 2 to 4 of the method according to the first mode of implementation.
- FIG. 17 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment.
- FIG. 17 illustrates by a view, partial and schematic, a step of depositing the film 149 of the second resin 151 on the rear face of the structure obtained at the end of the step of FIG. 16 .
- This step is substantially identical to the step illustrated in FIG. 5 of the method according to the first embodiment.
- the second resin 151 is preferably based on uncrosslinked epoxy and / or acrylate.
- FIG. 18 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment.
- FIG. 18 illustrates by a view, partial and schematic, a step of forming the second lens array 141 from the film 149.
- the second lens array 141 is produced by molding (imprint). More precisely, the film 149, of constant initial thickness, is deformed by pressing a mold 157 on the structure.
- the mold 157 used preferably has the shape of the imprint of the lens array 141.
- the structure is, at the same time, exposed to light radiation, for example UV or to a heat source ( thermal molding) making it possible to crosslink, and therefore harden, the second resin 151.
- the second resin 151 then takes the reverse shape of the mold 157.
- the structure can be, during this step, mounted on a protective film, by its front face, so as not to damage the first array of lenses 131.
- FIG. 18 corresponds to the structure obtained at the end of the step described above, the mold 157 still being in contact with the resin 151.
- FIG. 19 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the third embodiment.
- FIG. 19 illustrates, in a partial and schematic view, a step of removing the mold 157 present on the structure obtained at the end of the step of FIG. 18.
- the lenses 141 are not necessarily separated from one another. Indeed, the latter can be connected by a crosslinked film originating from the film 149. This phenomenon is due in particular to the defects present on the internal surface of the mold 157, to defects in planarization of the layer 139.
- This step requires prior alignment of the mold 157 with the lenses 131 (and the openings 137) in order to form the lenses 141 aligned with the lenses 131 (and the openings 137).
- FIG. 20 illustrates, in a sectional view, a variant of the steps of FIGS. 18 and 19.
- FIG. 20 illustrates by a view, partial and schematic, an alternative embodiment of the steps of FIGS. 18 and 19.
- the step illustrated in FIG. 20 differs from the steps illustrated in FIGS. 18 and 19 in that the number of lenses 141 of the second array is not identical to the number of lenses 131 of the first array.
- the number of lenses 141 is preferably greater than the number of lenses 131.
- the number of lenses 141 is at least twice the number of lenses 131.
- the optical axis 143 (FIG. 1) of each lens 141 is, in this case, not necessarily aligned with the optical axis 143 (FIG. 1) of a lens 131.
- This variant therefore does not require prior alignment of the mold 157 with the lenses 131 (and the openings 137).
- FIGS. 21 to 24 schematically and partially illustrate successive steps of an example of the method of manufacturing an angular filter according to a fourth embodiment.
- the fourth mode of implementation differs from the first mode of implementation in that the two arrays of lenses 131 and 141 are produced separately and then assembled by an adhesive.
- FIG. 21 illustrates, in a sectional view, a step of a fourth embodiment of a method for manufacturing an angular filter.
- FIG. 21 illustrates, in a partial and schematic view, a step of forming a structure substantially identical to the structure illustrated in FIG. 4 of the method according to the first embodiment.
- FIG. 22 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the fourth embodiment.
- FIG. 22 illustrates a step of forming a stack 23, comprising, from top to bottom: an adhesive film 159; a second substrate 161; and the second lens array 141.
- the second substrate 161 is substantially identical to the first substrate 133 illustrated in FIG. 2 of the method according to the first embodiment.
- the formation of the lens array 141 is substantially identical to the formation of the lens array 141 mentioned in the steps illustrated in FIGS. 5 to 7 of the method according to the first embodiment, at the difference except that, in the step of FIG. 22, the second array of lenses 141 is formed on the substrate 161.
- the second array of lenses 141 being produced on a structure not comprising the first array of lenses 131, the lenses 141 do not can however not be produced, by photolithography, by the action of collimated light through the mask formed by the first array of lenses 131.
- the formation of the lens array 141 is substantially identical to the formation of the lens array 141 mentioned in the steps illustrated in FIGS. 17 to 20 of the method according to the third embodiment.
- FIG. 23 illustrates, in a sectional view, another step of the method of manufacturing an angular filter according to the fourth embodiment.
- FIG. 23 illustrates a step of assembling the two structures illustrated in FIG. 21 and in FIG. 22.
- FIG. 24 illustrates, in a sectional view, a variant of the step of FIG. 23.
- FIG. 24 illustrates by a view, partial and schematic, an alternative embodiment of the steps of FIGS. 22 and 23.
- the structure illustrated in FIG. 24 differs from the structure illustrated in FIG. 23 in that the number of lenses 141 of the second array is not identical to the number of lenses 131 of the first array.
- the number of lenses 141 is preferably greater than the number of lenses 131.
- the lenses 141 illustrated in FIG. 24, are substantially identical to the lenses 141 illustrated in FIG. 20 of the method according to the third embodiment.
- This variant therefore does not require prior alignment of the array of lenses 141 with the array of lenses 131 (and the openings 137).
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
- Lenses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1913892A FR3104272B1 (fr) | 2019-12-06 | 2019-12-06 | Filtre angulaire optique |
PCT/EP2020/084543 WO2021110875A1 (fr) | 2019-12-06 | 2020-12-03 | Filtre angulaire |
Publications (1)
Publication Number | Publication Date |
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EP4070137A1 true EP4070137A1 (fr) | 2022-10-12 |
Family
ID=70228128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20815886.5A Withdrawn EP4070137A1 (fr) | 2019-12-06 | 2020-12-03 | Filtre angulaire |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230003923A1 (fr) |
EP (1) | EP4070137A1 (fr) |
JP (1) | JP2023504883A (fr) |
CN (1) | CN218383360U (fr) |
FR (1) | FR3104272B1 (fr) |
WO (1) | WO2021110875A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3094140B1 (fr) | 2019-03-22 | 2022-04-08 | Isorg | Capteur d'images comprenant un filtre angulaire |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US6894840B2 (en) * | 2002-05-13 | 2005-05-17 | Sony Corporation | Production method of microlens array, liquid crystal display device and production method thereof, and projector |
KR100539090B1 (ko) * | 2003-04-18 | 2005-12-26 | 포스트마이크로 주식회사 | 마이크로 렌즈 제조 방법 |
JP4985061B2 (ja) * | 2007-04-06 | 2012-07-25 | 株式会社ニコン | 分光装置および撮像装置 |
JP2011203792A (ja) * | 2010-03-24 | 2011-10-13 | Hitachi Displays Ltd | 撮像装置 |
-
2019
- 2019-12-06 FR FR1913892A patent/FR3104272B1/fr active Active
-
2020
- 2020-12-03 CN CN202090000999.9U patent/CN218383360U/zh active Active
- 2020-12-03 WO PCT/EP2020/084543 patent/WO2021110875A1/fr unknown
- 2020-12-03 US US17/782,558 patent/US20230003923A1/en active Pending
- 2020-12-03 JP JP2022534311A patent/JP2023504883A/ja active Pending
- 2020-12-03 EP EP20815886.5A patent/EP4070137A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
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WO2021110875A1 (fr) | 2021-06-10 |
FR3104272B1 (fr) | 2023-09-01 |
CN218383360U (zh) | 2023-01-24 |
FR3104272A1 (fr) | 2021-06-11 |
JP2023504883A (ja) | 2023-02-07 |
US20230003923A1 (en) | 2023-01-05 |
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