Additive manufacturing system and method for additively manufacturing an object

Abstract

An additive manufacturing system (100) and a method for additively manufacturing an object are provided. The additive manufacturing system includes a build platform (101). A surface (101-a) of the build platform is configured to support the object being manufactured. Additionally, the additive manufacturing system includes a manufacturing module (102) configured to create layers of the object. The surface of the build platform is impermeable, and the additive manufacturing system is configured to move one point on the surface of the build platform independently of other points on the surface while manufacturing the object.

Description

Technology Field

[0001] The present disclosure relates to an additive manufacturing system and method for additively manufacturing an object. Background Technology

[0002] Additive manufacturing is a technology for manufacturing various objects. In an embodiment, such an object may be an eyeglass component, for example, a lens.

[0003] In additive manufacturing, an object is manufactured by depositing materials to create layers of the object. In other words, the object is manufactured by stacking layers.

[0004] In an embodiment, the base portion of the object may have a footprint that contacts the building platform of the additive manufacturing system when oriented for manufacturing. In an embodiment, particularly when additively manufacturing a complex object (e.g., an object having a cantilevered portion), a pillar supporting the cantilevered portion may be created. When the object is additively manufactured, this pillar is removed.

[0005] The creation and removal of these pillars increase the complexity of manufacturing, the amount of material used, and the resulting manufacturing costs.

[0006] An additive manufacturing system and a related method for additively manufacturing an object are needed that enable the manufacturing of the object without having the aforementioned disadvantages. means of solving the problem

[0007] A simplified summary is presented below to provide a basic understanding of the various aspects of the present disclosure. This summary is not a comprehensive overview of all aspects considered, nor is it intended to identify the core or important elements of any aspect or to describe the scope of any or all aspects. Its sole purpose is to present some concepts regarding one or more aspects in a simplified form as an introduction to the more detailed descriptions that follow.

[0008] One aspect of the present disclosure is an additive manufacturing system. The additive manufacturing system includes a build platform. The surface of the build platform is configured to support an object to be manufactured. Additionally, the additive manufacturing system includes a manufacturing module configured to create layers of an object. The surface of the build platform is impermeable, and the additive manufacturing system is configured to move one point on the surface of the build platform independently of other points on the surface while manufacturing the object.

[0009] Another aspect of the present disclosure is a method for additively manufacturing an object. Such a method comprises the step of creating a first layer of solid material, the first layer being part of the object. Additionally, the method comprises the step of adjusting the position of at least one point on the surface of a construction platform independently of other points on the surface. The construction platform is configured to support the object while manufacturing the object. Additionally, the method comprises the step of creating a second layer of solid material, the second layer being part of the object. The surface of the construction platform is impermeable.

[0010] Another aspect of the present disclosure is a method for additively manufacturing an object. Such a method comprises the steps of: generating successive layers of an object; and modifying the shape of an impermeable surface of a construction platform intended to support the object so that a portion of the surface of the construction platform is configured to support a portion of a layer of the object to be manufactured in the future that is not placed on a previously manufactured layer of said object.

[0011] A computer may include memory and a processor. Examples of processors include a microprocessor, a microcontroller, a graphics processing unit (GPU), a central processing unit (CPU), an application processor, a digital signal processor (DSP), a reduced instruction set computing (RISC) processor, a system-on-chip (SoC), a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. Memory may be a computer-readable medium. For example, and without limitation, such a computer-readable medium may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, a combination of the types of computer-readable media described above, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by the processor of the computer.

[0012] Another aspect of the present disclosure is a computer-readable, non-transient program storage device that substantially embodies a program of instructions executable by a computer for carrying out a method for additively manufacturing an object. Such a method comprises the step of creating a first layer of solid material, the first layer being part of the object. Additionally, the method comprises the step of adjusting the position of at least one point on the surface of a construction platform independently of other points on the surface. The construction platform is configured to support the object while manufacturing the object. Additionally, the method comprises the step of creating a second layer of solid material, the second layer being part of the object. The surface of the construction platform is impermeable.

[0013] Another aspect of the present disclosure is a computer-readable, non-transient program storage device that substantially embodies a program of instructions executable by a computer for carrying out a method for additively manufacturing an object. The method comprises the steps of: generating successive layers of an object; and modifying the shape of an impermeable surface of a construction platform intended to support the object so that a portion of the surface of the construction platform is configured to support a portion of a layer of an object to be manufactured in the future that is not placed on a previously manufactured layer of said object. Brief explanation of the drawing

[0014] For a more complete understanding of the description provided herein and its advantages, we will now refer to the following brief description in conjunction with the attached drawings and detailed description, where similar reference numbers in the drawings indicate similar parts. Figure 1 shows an additive manufacturing system. FIGS. 2-a to 2-c show embodiments of a construction platform at different points in time. FIGS. 3-a to 3-c show other embodiments of a construction platform at different points in time. Figure 4 shows the coffee ring effect. Figure 5 shows the local surface power ( P Represents the factors used in the determination of ). Figure 6 shows parameters related to the description of the sine function of the local waveform of the layer. FIGS. 7-a to 7-c show various shapes of prism bases forming a block. Figure 8 shows a method for additive manufacturing of an object. Figure 9 shows a use case of the method of Figure 6 for additive manufacturing of an object. Specific details for implementing the invention

[0015] The detailed description provided below in connection with the accompanying drawings is intended to describe various possible embodiments and is not intended to represent the only embodiment in which the concept described herein can be implemented. The detailed description includes specific details for the purpose of providing a complete understanding of the various concepts. However, those skilled in the art will understand that the concept can be implemented without such specific details. In some cases, to avoid obscuring the concept, well-known structures and components are illustrated in block diagram form.

[0016] Description of additive manufacturing systems

[0017] FIG. 1 shows an additive manufacturing system (100). The additive manufacturing system (100) is,

[0018] · A construction platform (101), wherein the surface (101-a) of the construction platform (101) can be configured to support an object being manufactured;

[0019] · Manufacturing module (102) that can be configured to create a layer of an object

[0020] It may include.

[0021] The surface (101-a) of the construction platform (102) may be impermeable.

[0022] The additive manufacturing system (100) may be configured to move one point on the surface (101-a) of the construction platform (101-a) independently of another point on the surface (101-a) while manufacturing an object.

[0023] "Additive manufacturing system" refers to a manufacturing technology defined in the international standard ASTM 2792-12, which describes a process of manufacturing an object by combining materials based on 3D model data (typically by stacking layers one by one), unlike subtractive manufacturing technologies such as conventional machining methods.

[0024] There are various additive manufacturing methods, including stereolithography, mask stereolithography or mask projection stereolithography, polymer jetting, scanning laser sintering (SLS), scanning laser melting (SLM), and fusion deposition modeling (FDM).

[0025] Additionally, the additive manufacturing system may include a control module for controlling point movement of the surface (101-a) and controlling the manufacturing module (102). The purpose of such control may be to create layers of an object.

[0026] The control module may include memory and a processor.

[0027] The control module can be a computation module with low resource consumption.

[0028] Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, system-on-chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure.

[0029] Memory may be a computer-readable medium. For example, and without limitation, such a computer-readable medium may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that may be used to store computer-executable code in the form of instructions or data structures that can be accessed by a processor of a control module.

[0030] In an embodiment, the surface (101-a) of the construction platform (101) where the object is created is the top surface of the construction platform (101). In an embodiment, after each layer is manufactured, the construction platform (101) moves along a vertical axis by the thickness of the layer (downward if the manufacturing of the object starts from the bottom layer, and upward if the manufacturing of the object starts from the top layer).

[0031] In an embodiment, different layers can be realized through liquid polymerization. Such polymerization can be realized, for example, using UV light or heat.

[0032] The manufacturing module (102) may be configured to spray a liquid material and solidify the liquid material to form a layer of an object. The manufacturing module (102) may include a jetting head configured to spray a liquid material.

[0033] In an embodiment, the liquid material may be a UV-curable liquid material. The manufacturing module (102) may include UV light configured to cure the UV-curable liquid material. That is, in this embodiment, a layer of liquid may be sprayed onto a construction platform (101), and then the liquid may be polymerized to form a layer of object. Once this layer is formed, an additional layer of liquid is sprayed onto the previously formed layer and polymerized to form an additional layer of object. This embodiment is also known as polymer jetting.

[0034] In an embodiment, such liquid may be contained within a tank. The bottom of the tank forms a construction platform (101). A portion of the upper layer of the liquid is polymerized to form a layer of the object. Once the layer is formed, the bottom of the tank forming the construction platform (102) is moved downward so that the layer of liquid can cover the upper part of the object. Subsequently, an additional layer of the object is created by polymerizing an additional layer of the liquid. That is, the manufacturing module (102) may be configured to solidify a portion of the upper layer of the liquid material to form a layer of the object. The liquid material may be a curable material, for example, a UV-curable material, and the manufacturing module (102) may include UV light configured to cure the UV-curable material.

[0035] The manufacturing module (102) may include other types of curing units and dispensing units, and may include, for example, the following:

[0036] · Use of material dispensers and LED bars or DLP projectors: In this case, the curing selectivity is achieved by image projection (LED bar or DLP).

[0037] · Use of a print head for spraying liquid material, and use of an LED bar or DLP for curing the liquid material.

[0038] · When a thick layer is realized, a dispenser such as a syringe, and an LED bar or DLP for curing the liquid material are used. A thick layer means a layer thicker than 100 μm.

[0039] As described above, the additive manufacturing system (100) may be configured to move one point on the surface (101-a) of the construction platform (101-a) independently of another point on the surface (101-a) while manufacturing an object.

[0040] The object can be manufactured layer by layer, and the additive manufacturing system is configured to move a point on the surface of the build platform between manufacturing two consecutive layers.

[0041] The additive manufacturing system (100) may be configured to move a point on the surface (101-a) of the build platform (101) so that the distance between the manufacturing module (102) and the surface where the layer is created is kept constant. This is particularly useful when used in polymer jetting, and the droplet ejected by the manufacturing module (102) can be placed very close to the part being built, as the ejection distance is typically in the range of mm (about 1 mm for the print head reference number (KM1024iSHE) manufactured by Konica Minolta). The ejection distance refers to the distance between the print head and the surface where the liquid material is deposited. Such a surface is typically the build platform or the surface of the previous layer. This means that the shape of the build platform (101) must be adjustable during the printing process to be versatile enough to produce an entire product family.

[0042] Maintaining a constant distance means that the distance remains within a range close to a predetermined distance. The variation range must allow for droplet formation while preventing the formation of undesirable peripheral droplets. Peripheral droplets refer to small droplets that detach from the ejection axis due to air forces and are separated from the main droplet of the liquid material.

[0043] Using an additive manufacturing system (101), a transparent object, for example, a portion of an eyeglass or ophthalmic lens, can be manufactured. Sometimes, the object may include a cantilevered portion. By moving a specific point on the surface (101-a), the additive manufacturing system (101) can create a support for this cantilevered portion. For example, the support can be used to support a portion of the curvature on the concave or convex side of the lens during manufacturing.

[0044] An object (e.g., an ophthalmic lens) can be considered transparent if, when observing an image through it, the image can be perceived without a significant decrease in contrast. In other words, even if a transparent object is positioned between the image and the observer, the quality of the image is not significantly degraded.

[0045] When using an additive manufacturing system (100), it may not be necessary to create pillars that are sacrificial materials. This reduces the complexity of printing, eliminates the need to remove these sacrificial materials, and limits the amount of material required to manufacture the object.

[0046] In the embodiments shown in FIGS. 2-a to 2-c, the construction platform (101) may be segmented into a plurality of blocks (201). A sealing portion (202) may be located at the joint between the blocks (201). At least one of the blocks (201) may be configured to move independently of another block (201). Different blocks (201) may form an actuator. The blocks (201) may be configured to move one end relative to the other end.

[0047] The blocks (201) or actuators can be moved using a motor and screw, a piezoelectric actuator, or fluid pressure.

[0048] FIGS. 2-a through 2-c each show the same embodiment of the construction platform (101) at different points in time. The blocks (201) are arranged differently in each figure to be applied to different layers of the object to be manufactured or the same object to be manufactured.

[0049] While manufacturing the object, the moving points may be located on the surface of one of the blocks (201).

[0050] The variable geometry of the surface (101-a) of the construction platform (101) is obtained by different blocks (201) that can change their relative positions to obtain a geometry of the surface (101-a) compatible with the layer to be manufactured.

[0051] A seal (202) located at the joint between the blocks (201) contains a liquid material during the manufacturing process. Containing means that the seal (202) prevents the liquid material from leaking between the blocks (201). The seal prevents the liquid material from penetrating between the blocks (201). Such a seal can be obtained by mechanically forming the blocks (201) through very fine adjustment between the blocks (201), or by using auxiliary elements such as a film or a spray. In an embodiment, the outer boundary of the construction platform (101) may additionally include an external seal. The purpose of such an external seal is to prevent the liquid material from leaking outside the construction platform (101).

[0052] FIGS. 3-a through 3-c each illustrate the same embodiment of the construction platform (101) at different time points. The blocks (201) are arranged differently in each figure to be applied to different layers of the object to be manufactured or the same object to be manufactured. In this embodiment, the seal (202) is replaced by a layer (301) of an elastic and non-porous material. The layer (301) may be formed of, for example, silicone, polyurethane, neoprene, or an elastomer of PDMS (polydimethylsiloxane). As previously described, the different blocks (201) form an actuator. One end of each block (201) may be attached to the layer (301) and the other end may be attached to a fixed support common to all blocks (201). In other words, in this embodiment, the surface (101-a) of the construction platform (101) and the construction platform (101) include an actuator, and the end of the actuator is configured to move one point on the surface (101-a) independently of another point on the surface.

[0053] The embodiments of FIGS. 3-a through 3-c prevent step differences from occurring on the manufactured object due to the joints between the blocks (201). These step differences occur due to a height difference between two adjacent blocks. The step differences create discontinuities on the surface of the manufactured object. By using the layer (301), the height difference between two adjacent blocks disappears, so no step differences occur on the manufactured object. In other words, the layer (301) has the additional advantage of reducing the need for polishing the manufactured object after the manufacturing step.

[0054] Additionally, the embodiments of FIGS. 3-a to 3-c may have any shape of blocks (e.g., cylindrical). In practice, in this embodiment, impermeability is achieved by the layer (301) rather than the seal (202).

[0055] In an embodiment, the layer (301) of an elastic and non-porous material may be chemically compatible with the liquid material used to manufacture the object. Additionally, the material of the layer (301) may be selected so that the object can be easily separated from the layer (301). Easily separating means separating without damaging the layer (301) or the object.

[0056] In addition, wettability between the layer (301) and the liquid material is an important criterion in polymer jetting technology, where printed droplets must collapse to prevent material non-uniformity. It will be seen that the film does not amplify the "coffee ring" effect. FIG. 4 illustrates the "coffee ring" effect as shown within the circle (401). The "coffee ring" effect is a spontaneous phenomenon affecting a droplet, in which the liquid constituting the droplet flows from the center of the droplet to the periphery by capillary action, pushing the liquid constituting the droplet toward the periphery of the droplet.

[0057] To avoid the aforementioned disadvantages, advantageously, the layer (301) may be formed of an elastomer such as polyurethane, silicone, or polydimethylsiloxane (PDMS). The layer (301) may be formed of, for example, Teflon.

[0058] Additionally, the layer (301) may be selected so as not to create optical refractive power defects larger than are permissible for the object. If the object is an ophthalmic lens, the tolerance for a standard-sized ophthalmic lens is typically + / - 0.06 diopters. A tolerance of + / - 0.06 diopters is the standard ISO tolerance for semi-finished lenses for the distance vision portion of a single vision or progressive lens. The permissible amplitude of the defect may vary depending on the wavelength of the defect. The wavelength is related to the distance between the axes of the blocks (201).

[0059] The amplitude depends on the ability of the layer (301) to continuously cover all blocks (201), taking into account the shape thus generated. The local surface force (P) is calculated based on the refractive index (n) of the material and the local radius (r) of the surface. The radius r is obtained by the derivative value of the function (C) of the surface of the layer (301). FIG. 5 illustrates these factors used in determining the local surface force (P). The following equation may be used to determine the local surface force (P):

[0060]

[0061] At this time,

[0062]

[0063] Based on the hypothesis that the local waveform of the layer (301) can be described as a sine function having a total amplitude (A) and wavelength (λ), the following equation can be obtained:

[0064]

[0065] Figure 6 shows parameters related to describing the local waveform of the layer (301) as a sine function.

[0066] The applicant conducted experiments, and these experiments show that when the waveform of the layer (301) is less than 0.1 μm at a block (201) width of 2 mm (wavelength (λ) of 4 mm), an optical smoothing effect of less than 0.06 diopters is obtained.

[0067] If the object is an ophthalmic lens and the surface of the ophthalmic lens is not sufficiently smooth, a person skilled in the art knows how to smooth the surface by adding a covering coating, for example as described in patent application number EP3842221, or by filtering polishing with a polishing tool, as described in patent application number EP3060369.

[0068] In an embodiment, each block may be a prism. In the present disclosure, a prism means a three-dimensional geometric figure in which two ends (also referred to as bases) are similar, identical, and parallel to each other, and the sides are parallelograms. In an embodiment, the two ends are perpendicular to the straight figures forming the ends.

[0069] In the embodiment, the blocks may be cylindrical, and in this case, it is advantageous to place a layer (301) on the top of the block to ensure impermeability of the surface of the construction platform.

[0070] In an embodiment, the base of the prism may have a shape selected from the group consisting of a triangular shape, a square shape, and a hexagonal shape. This geometry may provide a sealing function between the blocks (201) without a sealing film when the blocks (201) are perfectly aligned.

[0071] FIGS. 7-a to 7-c show various shapes of prism bases forming a block. FIG. 7-a shows a triangular shape, FIG. 7-b shows a square shape, and FIG. 7-c shows a hexagonal shape. "a" is the width of the block.

[0072] In an embodiment, a point on the surface (101-a) of the construction platform (101) is configured to move in a direction substantially perpendicular to the surface (101-a).

[0073] Description of a method for additive manufacturing objects

[0074] FIG. 8 illustrates the steps of a method for additively manufacturing an object. This method can be realized by the system (100) of FIG. 1.

[0075] This method,

[0076] · A step (801) of creating a first layer of solid material, wherein the first layer is part of an object;

[0077] · A step (802) of adjusting the position of at least one point on the surface of the construction platform independently of other points on the surface, wherein the construction platform is configured to support the object while manufacturing the object;

[0078] · Step (803) of creating a second layer of solid material, wherein the second layer is part of an object.

[0079] Includes

[0080] That is, FIG. 8 illustrates a method for additively manufacturing an object. This method comprises the steps of: generating consecutive layers of an object; and modifying the shape of an impermeable surface of a construction platform (101) intended to support the object so that a portion of the surface of the construction platform (101) is configured to support a portion of the layers of the object to be manufactured in the future that is not placed on the previously manufactured layer of the object. The modification of the surface shape may be made at the initialization of the method or between generating two consecutive layers. The phrase “the surface of the construction platform (101) is configured to support a portion of the layers of the object” means that the shape of the surface matches the shape of a portion of the layer to be realized.

[0081] To realize additive manufacturing of an object, the memory of the control module may store a computer program including instructions that, when the program is executed by the processor, the control module commands the additive manufacturing system (100) to realize the method of FIG. 8.

[0082] The second floor may be partially placed on the first floor and / or partially placed on at least one point of the adjusted construction platform.

[0083] Both the step of creating the first layer (801) and the step of creating the second layer (803) are realized by the manufacturing module (102).

[0084] Point movement on the surface (101-a) of the construction platform (101) can be defined using various strategies. For example, initially, all points may be at the same height. There is relative translational movement of some points corresponding to the layer thickness of the object. The points being translated are defined according to the shape of the layer to be manufactured.

[0085] When the convex side of the lens is manufactured first (meaning the convex side faces the construction platform (101) (opposite to the manufacturing module (102))), the first layer may be configured in a shape similar to a circle. At each step, some of the points may be translated upward. For example, points aligned vertically with the periphery of the lens may be translated upward. This translation may vary depending on whether the construction platform (101) moves while the height of the manufacturing module (102) is fixed, or whether the manufacturing module (102) moves while the construction platform (101) is fixed.

[0086] When the liquid material is a UV-curable material and curing is performed by a display configured to project an image onto the liquid material, there is a correlation between the turned-on pixels of the display (the material is cured after being sprayed) and points on the surface (101-a) of the moving platform (101), because a reservoir for receiving the material being cured after being sprayed is created by the movement of the points.

[0087] When the concave surface of the lens is manufactured first (meaning the concave surface faces the construction platform (101)), the first layer is composed of a hollow circle or ring, and at each step, a point corresponding to the turned-on pixel of the display is moved relative to it.

[0088] The size of an actuator capable of moving a point can be the same as the size of a pixel. However, pixel sizes in additive manufacturing are typically about 10 to 100 μm. Therefore, it may be difficult to have actuators of this size. When the distance between actuators is greater than the distance between pixels, one possible method is to group the pixels to match the size of the actuators and take this into account when generating the image.

[0089] That is, the point movement of the surface (101-a) may vary depending on the manufacturing progress.

[0090] The point can be translated into each layer until it is not covered by the liquid material. After the liquid material hardens, the point maintains its position until the manufacturing of the object is finished.

[0091] At the start of manufacturing, the surface (101-a) of the construction platform (101) is flat. By moving some points relative to the manufacturing module (102), curvature is created.

[0092] When considering the movement of the manufacturing module (102), some points are moved upward at each stage. These points correspond to points outside the image area projected to cure the liquid material, which are not covered by the liquid material. A gap may be applied to ensure better continuity at the boundary. This gap may be established by adding extra thickness during image construction to define the points to be moved. This gap must not create an extra height that could hinder the movement of the manufacturing module (102).

[0093] FIG. 9 illustrates an example of using the method of FIG. 8 to additively manufacture a lens using an additive manufacturing system (100). From the top to the bottom, a block (201) covered by a layer (301) is first placed to create the bottom portion of the lens. Then, the block (201) moves to create a support while creating different layers of the lens. Then, at the bottom portion, when a new layer is created, the block (201) can remain in a fixed state without the need for additional support.

Claims

Claim 1 An additive manufacturing system (100) comprising: a construction platform (101), wherein the surface (101-a) of the construction platform (101) is configured to support an object to be manufactured; and a manufacturing module (102) configured to create a layer of said object, wherein the surface (101-a) of the construction platform (101) is impermeable, and the additive manufacturing system (100) is configured to move one point on the surface (101-a) of the construction platform (101) independently of another point on the surface (101-a) while manufacturing said object. Claim 2 An additive manufacturing system (100) according to claim 1, wherein the surface (101-a) of the construction platform (101) comprises a layer of an elastic and impermeable material, the construction platform comprises an actuator, and the end of the actuator is configured to move the point on the surface independently of another point on the surface. Claim 3 In claim 1, the construction platform (101) is segmented into a plurality of blocks (201), a sealing portion (202) is located at the joint between the blocks (201), and at least one of the blocks is configured to move independently of the other blocks, an additive manufacturing system (100). Claim 4 In paragraph 3, each block (201) is a prism, in an additive manufacturing system (100). Claim 5 In paragraph 4, the base of the prism has a shape selected from the group consisting of a triangular shape, a square shape, and a hexagonal shape, in an additive manufacturing system (100). Claim 6 An additive manufacturing system (100) wherein, in any one of claims 1 to 5, the point on the surface (101-a) of the construction platform (100) is configured to move in a direction substantially perpendicular to the surface (101-a). Claim 7 An additive manufacturing system (100) wherein, in any one of claims 1 to 6, the object is manufactured layer by layer, and the additive manufacturing system (100) is configured to move the point on the surface (101-a) of the construction platform (101) between manufacturing the two consecutive layers. Claim 8 In claim 7, the additive manufacturing system (100) is configured to move the point on the surface (101-a) of the construction platform (101) so that the distance between the manufacturing module (102) and the surface where the layer is created is maintained constant. Claim 9 In claim 7 or 8, the additive manufacturing system (100), wherein the manufacturing module (102) is configured to spray a liquid material and solidify the liquid material to form a layer of the object, Claim 10 In claim 9, the liquid material is a UV-curable liquid material, the manufacturing module (102) includes a jetting head configured to spray the UV-curable liquid material, and the manufacturing module (102) includes UV light configured to cure the UV-curable liquid material, an additive manufacturing system (100). Claim 11 An additive manufacturing system (100) according to claim 7 or 8, wherein the construction platform (101) is the lower part of a tank, the tank contains a liquid material, and the manufacturing module (102) is configured to solidify a portion of the upper layer of the liquid material to form a layer of the object. Claim 12 In claim 11, the liquid material is a curable material, for example, a UV-curable material, and the manufacturing module (102) comprises UV light configured to cure the UV-curable material, an additive manufacturing system (100), Claim 13 In any one of claims 1 to 12, the object is a lens, and the additive manufacturing system (100) is configured to manufacture the lens, the additive manufacturing system (100). Claim 14 A method for additively manufacturing an object, the method comprises: a step (801) of creating a first layer of solid material, wherein the first layer is part of the object; a step (802) of adjusting the position of at least one point on the surface of a construction platform (101) independently of other points on the surface, wherein the construction platform (101) is configured to support the object while manufacturing the object; and a step (803) of creating a second layer of solid material, wherein the second layer is part of the object, and the surface of the construction platform (101) is impermeable. Claim 15 A method for additively manufacturing an object, the method comprising: · generating successive layers of the object; · modifying the shape of an impermeable surface of a construction platform (101) intended to support the object so that a portion of the surface of the construction platform (101) is configured to support a portion of the layers of the object to be manufactured in the future that is not placed on a previously manufactured layer of the object.

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