Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D11/00—Producing optical elements, e.g. lenses or prisms
  • B29D11/00009—Production of simple or compound lenses
  • B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
  • B29C64/10—Processes of additive manufacturing
  • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
  • B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
  • B29C64/10—Processes of additive manufacturing
  • B29C64/188—Processes of additive manufacturing involving additional operations performed on the added layers, e.g. smoothing, grinding or thickness control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
  • B29C64/30—Auxiliary operations or equipment
  • B29C64/386—Data acquisition or data processing for additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
  • B29C64/40—Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D11/00—Producing optical elements, e.g. lenses or prisms
  • B29D11/00009—Production of simple or compound lenses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y10/00—Processes of additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
  • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y50/00—Data acquisition or data processing for additive manufacturing
  • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y80/00—Products made by additive manufacturing
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
  • G02B1/041—Lenses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0072—Roughness, e.g. anti-slip
  • B29K2995/0073—Roughness, e.g. anti-slip smooth

Definitions

• said geometric characteristic representative of said cutoff spatial frequency corresponds to a diameter of a polishing pupil characteristic of said flexible polishing step and the critical distance is less than or equal to one-half, preferably one-quarter, or one-tenth, of the diameter of said polishing pupil.
• the at least three directions can each be represented by a half-axis resulting from the determined asperity, with these half-axes which are angularly offset with respect to one another with one or more specific offsets.
• the offset between two half-axes should not be characteristic of an excessively obtuse angle, and should preferably be less than about 160 °, for example.
• FIGS. 9A and 9B, 10A and 10B and 1 1A to 1 1 C respectively illustrate three alternative embodiments of the second improved additive manufacturing strategy.
• This intermediate optical element 10 is thus carried by the manufacturing support 12.
• the energy and the energy source are implemented, here a source emitting in the ultraviolet for the three-dimensional printing machine but it could be a laser in the case of a stereolithography machine or a heating energy in the case of a wire deposit also known as extrusion thermoplastic wire.
• the photo-polymerization steps can be implemented at the deposition of each volume element, globally after the passage of the nozzle and / or the nozzle ramp or after the deposition of each layer of volume elements.
• the thickness Se of the excess thickness 9 is in the range [1 ⁇ ; 150 ⁇ ].
• the average thickness over the entire lens may be in the range [10 ⁇ ; ⁇ ⁇ ] and preferably in the interval [ ⁇ ⁇ , 50 ⁇ ].
• the first unit 2 is further configured to receive in step 107 a file comprising soft polishing data of the flexible polishing machine 21.
• This may be, for example, the diameter of the polishing pupil and / or the smoothing (or filtering) capabilities of the machine which are for example characterized by its spatial cut-off frequency and / or its cutoff spatial wavelength.
• It may also be the technical parameters of the flexible polishing machine such as the rotational speed of the intermediate optical element, the scanning speed, the number of scans, the pressure exerted by the polisher on the surface of the polishing machine. optical element, the trajectory and the scanning amplitude of the polisher, the mechanical properties of the polisher (including its dimensions and structure), the size, the concentration and / or the hardness of the abrasive particles.
• the first unit 2 is configured to optionally determine a dimensional shrinkage and an index variation of the optical element intermediate 10. These are possible future evolutions, on the one hand, of the refractive index of the material 18 in which the intermediate optical element 10 is made and, on the other hand, of the geometry (withdrawal dimensional) of the intermediate optical element 10, for example during an annealing step.
• the manufacturing zones of the first type are here defined by a sliding cylinder of axis normal to the surface of the target ophthalmic lens 30, with the total volume of the extra thickness 9 in this sliding cylinder which is substantially constant.
• the sliding cylinder here has a diameter similar to that of the polishing pupil characteristic of the flexible polishing step.
• the intermediate optical element 10 is here manufactured so that it has several manufacturing zones of the first type which are formed on separate layers, and which do not overlap.
• At least one of the first type of manufacturing zones may be formed on a layer which overlaps an immediately lower layer.
• the predetermined volume elements may have different sizes during construction in the manufacturing zone of the first type; and / or that the first portions do not all have the same dimensions in an area of the first type. For example, the widths are different and / or the heights are different.
• a first portion may be at a predetermined distance from another first portion, separated by a second portion, which distance may be less than the minimum width of a voxel.
• the manufacturing instruction of the intermediate optical element 10 is here also determined so that the latter has, in section, at the level of at least one of its faces, manufacturing zones of a first type which are each provided with a plurality of first portions 150 and second portions 151 formed alternately.
• the alternation of the first and second portions 150 and 151 here mainly extend in a general direction generally perpendicular to the axis of steeper slope between the layers.
• the alternation of the first and second portions is therefore in a direction generally ortho-radial with respect to the optical axis of the lens. This direction may be a local axis, or a curve, substantially ortho-radial with respect to the curvature of the final lens.
• the predetermined volume element or elements which are in the immediate proximity of the roughness or which form the peak and the trough are here more easy to abrade as the predetermined volume element (s) which are at a distance from this peak and this hollow.
• the closer one gets to the peak and the depression of the roughness 40 the more the predetermined volume element (s) are formed by a friable material compared to that used for the body of the intermediate optical element, or are formed by a material comprising a porosity agent.
• the method further comprises one or more other manufacturing steps, for example a trimming step and / or a marking step to form so-called temporary marks;

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Health & Medical Sciences (AREA)
• Ophthalmology & Optometry (AREA)
• General Physics & Mathematics (AREA)
• Eyeglasses (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (7)

Cited By (6)

Families Citing this family (23)

Citations (7)

Family Cites Families (8)

• 2013
  • 2013-12-11 FR FR1362435A patent/FR3014355B1/fr not_active Expired - Fee Related
• 2014
  • 2014-12-09 US US15/103,643 patent/US10442146B2/en active Active
  • 2014-12-09 CN CN201480068905.0A patent/CN105829074B/zh active Active
  • 2014-12-09 BR BR112016012473-1A patent/BR112016012473B1/pt active IP Right Grant
  • 2014-12-09 JP JP2016538036A patent/JP6632530B2/ja active Active
  • 2014-12-09 EP EP14825417.0A patent/EP3079884B1/fr active Active
  • 2014-12-09 WO PCT/FR2014/053232 patent/WO2015086981A1/fr not_active Ceased

Patent Citations (7)

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