CH718540B1 - Material dispensing device and associated method - Google Patents

Abstract

The present invention describes a device (1) for dispensing a material (M) comprising an injection system with an injection needle (11), and a first detection device (20) for determining both the position of a part (P) and the quantity of material to be deposited thereon. The invention also covers a method for dispensing a material as well as the parts produced according to this method and the objects comprising several of these parts. The invention also relates to a method for automated deposition of a material on a surface of one or more parts, by means of such a dispensing device.

Description

Technical field

[0001] The present invention relates to a device for dispensing viscous and/or multi-component material such as photoluminescent material. In particular, it is an automated device for dispensing a multi-component fluid in a reproducible manner. It is furthermore an automated device adaptable to the dispensing of a variety of different materials.

State of the art

[0002] In the industrial field, it is often necessary to dispense a more or less viscous fluid onto the surface of the parts being manufactured. Such fluids may also contain solid particles. The automation of such processes requires controlling both the position of the parts and the quantity of material to be deposited. In the case where the fluid to be deposited is intended to produce an aesthetic effect, the quality of the deposit must be extremely careful, to the point that it still requires human intervention. This is particularly the case in the field of watchmaking, for deposits of photoluminescent material for example.

[0003] A luminescent or photoluminescent material is often used to materialize the hands or indices of a watch dial. The material to be deposited is generally viscous and may include a solid phase, so that it may be difficult to control the regularity and reproducibility of the deposit. The particles included in such compositions may be of variable sizes. The defects that may result are exacerbated by the luminescent properties of the deposited material and lead to the rejection of the part, which can significantly increase production costs. Under these conditions, increasing production rates or reproducibility through automation remains a challenge.

[0004] The materials dispensed may also be abrasive and prematurely damage the injection tools, in particular the tips of needles or injectors, which may result in an alteration of their properties and create drifts in the production batches. These considerations are added to the fact that the parts receiving the luminescent material are small, of the order of a millimeter. Their variations in dimensions, from one to another, can significantly impact the result of the deposition. It is therefore not possible to calibrate an identical dispensing volume for all the parts because in this case, the result would be too inhomogeneous.

[0005] Two-component or multi-component materials are most often custom-made according to specific needs. In particular, the viscosity, particle concentration and/or particle size they comprise frequently vary from one composition to another. Their properties can also vary according to environmental conditions such as temperature, humidity or the presence of static electricity. Such variability from one material to another limits the possibilities of large-scale automation.

[0006] Many deposition operations are still partly or completely manual. Despite the dexterity of the operators, most often able to make deposits in a reproducible manner, variability can be observed from one operator to another. The different parts then assembled into the same object may appear dissimilar and produce an aesthetic defect.

[0007] The solid particles contained in such materials can be of any type. For example, they have a crystalline structure, which gives them their properties. In this case, the optical properties of luminescent materials are closely linked to the crystalline structure of the particles they contain. It is important to preserve the integrity of these particles, particularly during injection operations, so as to preserve the luminescence of the final product.

Brief summary of the invention

[0008] An aim of the present invention is to propose an automated dispensing device for two-component or multi-component material, such as a photoluminescent material, making it possible to obtain a uniform result despite possible variations from part to part. The uniform result refers in particular to the visual appearance of the final part, comprising one or more surfaces covered with the luminescent material. In particular, it involves reproducing the same visual quality of each of these surfaces, both in their dimensions and in their shapes, so that they all appear identical. The uniform result also relates to the luminescence or phosphorescence properties of the surfaces covered with the luminescent material. In particular, the luminous intensity must correspond to an acceptable value or fall within a range of acceptable values. It must be identical or similar from one part to another, in particular in the case where the parts are intended to be assembled into a common object. The luminous intensity must also remain uniform within a given part. Reproducibility of the deposit is particularly necessary in the case of watch dial indices, for example.

[0009] Another aim of the invention is to propose a device for automated dispensing of photoluminescent material which makes it possible to increase the rates and/or the reproducibility without compromising on the quality of the deposits, or even with an increased quality of deposit compared to traditional methods involving human intervention.

[0010] Another aim of the present invention is to propose a device for automated dispensing of two-component or multi-component materials, the viscosity, size and number of solid particles of which vary from one material to another.

[0011] Another aim of the present invention is to propose a method for depositing a two-component or multi-component material such as a luminescent product, making it possible to produce a homogeneous and reproducible deposit despite possible dimensional variations of the parts to be covered.

[0012] According to the invention, these aims are achieved in particular by means of the dispensing device and the method described in the independent claims and detailed in the dependent claims.

[0013] This solution has in particular the advantage over the prior art of covering parts with a two-component or multi-component material in a reproducible manner despite variations in the dimensions of the parts to be covered.

Brief description of the figures

[0014] Examples of implementation of the invention are indicated in the description illustrated by the following figures: • Figures 1a, 1b: schematic representation of a deposit of multi-component material according to the present description. • Figure 2: schematic representation of a dispensing device according to the present description. • Figure 3: schematic representation of the main elements of the dispensing device 1 according to the present description. • Figure 4: Example of defective deposit. • Figure 5: Example of compliant deposit.

Example(s) of embodiment of the invention

[0015] Figure 1a shows an example of depositing a materialM on the surfaceS of a partP by means of an injection system 10 according to the present description. Figure 1b shows a partP in profile, the surfaceS of which is covered with a materialM. The partP may for example correspond to a watch hand or an index fixed on the dial of a watch. These examples are however not limiting. The partP designates in particular any part with a dimension of less than 20 mm, preferably less than approximately 10 mm, or of the order of 0.5 to 5 mm. The partP comprises at least one predetermined surfaceS, intended to receive one or more fluid materialsM. The surfaceS of the part may be delimited by a relief capable of containing the materialM dispensed. The relief may take the form of a border surrounding a portion of the surface of the partP to delimit the surfaceS to be covered with the materialM. Alternatively, the surfaceSmay be machined from the mass of the partP, so as to be delimited by the thickness of the partP. Alternatively or in addition, the surfaceSmay be delimited by a surface treatment of the partP, for example by applying a plasma or a coating around the surfaceSto be covered with the materialM. The surfaceSmay have variations from one partP to another, related to its perimeter as well as to its surface condition which may represent three-dimensional variations. It follows that an identical quantityQof materialMdeposited on the surfaceSof all partsPleads to variations in the appearance of the final product.

[0016] The materialM to be deposited on the surfaceS of the partP designates any fluid material. It designates in particular fluids comprising solid particles of micrometric size, typically between 0.5 and 100 µm, or between 5 and 80 µm or a mixture of particles of different sizes. The average particle size may be for example of the order of 15 to 30 µm, or approximately 20 µm. Such particles may be for example pigments. All kinds of pigments are considered here such as phosphorescent or fluorescent pigments, emitting in the visible or UV spectrum or in other spectra. Depending on the needs, the particles present in the materialsM may be intended to modify the mechanical properties of the materialsM once deposited, in particular to give them better resistance to abrasion, greater hardness or better resistance to aging. Other types of particles may be included in the composition of the materialsM. The particles may in particular have a crystalline structure. As such, the materialsMrepresent two-component or multi-component materials. For the purposes of this description, the terms multi-component materials are used to designate indifferently two-component materials and multi-component materials, comprising at least one solid phase dispersed in a liquid or viscous phase. The viscosity of the materialMmay vary from approximately 1 cP to 250,000 cP. The dispensing device 1 described here is particularly suitable for dispensing fluids having a viscosity greater than 5000 cp, preferably greater than 30,000 cp, or even greater than 50,000 cP. The device according to this description allows in this case the injection of small volumes of multi-component materialM and/or having a viscosity greater than 10 cp or 100 cp, with high reproducibility. Due to the presence of particles, the materialMcan be abrasive and degrade the injection tools. It can also generate overpressures at the injection tools and distort the quantities deposited. The volume of materialMdeposited on each surfaceSis typically of the order of a few nanoliters. The volume of each deposit is between 1 nanoliter and approximately 1 microliter.

[0017] Alternatively or in addition to the particles, the material M may comprise reagents enabling the material M to be solidified/or to allow its adhesion to the surface S once deposited, under UV irradiation or by heating or by any other means deemed adequate.

[0018] The material may include additives such as surfactants or solvents or other additives as required.

[0019] It is understood that several materials M can be deposited on the same surface S of a part P, for example superimposed on each other. In this case, at least one of these different materials M is preferably a multi-component material.

[0020] Figure 2 shows an example of a dispensing device according to the present description. The device1 comprises an injection system10 suitable for dispensing the materialM onto the partsP. The injection system can be of the volumetric type, allowing a predetermined volume to be injected. It can alternatively be of the time-pressure type. In this case, a predetermined pressure is applied to the materialM contained in the injection system for a predetermined duration. The injection system can alternatively be of the point-by-point micro-injection type, allowing the materialM to be propelled onto the surfaceS.

[0021] The injection system comprises a needle11 adapted to the injection of small volumes of materialsM, typically of the order of a few nanoliters. The needle11 may be made of metal or polymer or any other suitable material. It is preferably removable so as to be easily replaced.

[0022] The injection system 10, and in particular the injection needle 11, is arranged above a laying surface 40, on which one or more parts P can be arranged. The laying surface 40 is preferably horizontal. It may be provided that the horizontality of the laying surface is guaranteed by a level arranged on the machine or directly associated with the laying surface 40. The laying surface 40 is preferably movable in the horizontal plane along one or more of the x and y axes, in particular by means of adjustable supports 41, 42 along these axes. One or more rotation axes may be additionally provided so as to be able to tilt the laying surface 40 according to a range of predetermined and controlled angles. The laying surface 40 may also be movable along a vertical axis z, so as to be able to precisely position the part P relative to the other elements of the device 1, and in particular relative to the injection system 10. The laying surface 40 may comprise a fixing means (not shown) for holding one or more parts P in position. The parts P may be placed directly on the laying surface 40 individually, or via an intermediate support on which they are already distributed, individually or in batches.

[0023] The injection system 10 is preferably mobile and/or orientable. The injection system 10 can be mobile along a vertical axis z so as to precisely adjust the position of the needle above the surface S to be covered. Alternatively or in addition, the injection system 10, in particular its injection needle 11, can be orientable along an axis of rotation parallel to one of the axes x or y. In this way, the inclination of the injection needle 11 relative to the laying surface 40, and consequently relative to the surface S of the part P, can be modulated. The injection system can be oriented vertically, i.e. it forms an angle of 90° relative to the laying surface 40. However, it can be inclined up to an angle of 30° or 20° or less relative to the laying surface 40. The angle formed by the injection needle 11 and the laying surface 40 may for example vary from 90° to 20°, or remain between 80° and 30° or in a more restricted range between 70° and 35°. The injection system 10 or a part of the injection system may for this purpose be associated with a support 100 in the shape of an arc of a circle on which it can slide in a controlled manner. Other devices for tilting the injection system 10 may however be envisaged.

[0024] Alternatively or additionally, the injection system 10 or a part of the injection system 10, in particular the injection needle 11, may be orientable along a vertical axis of rotation. The positioning of the injection needle 11 may thus be controlled by means of suitable actuators relative to one or other of these axes.

[0025] The dispensing device1 further comprises a first detection device20, making it possible to determine the position of a partP, in particular the position of its surfaceS to be covered with the materialM. The position is understood as its coordinates along at least one of the x and y axes, preferably both. The position of the surfaceS may further comprise its coordinates along the vertical axis z. The first detection device20 thus makes it possible to determine the position as well as the orientation of the surfaceS, if applicable. The first detection device20 may be connected to one or more of the actuators making it possible to control the movable supports41, 42, the height of the laying surface40, or other elements, or to enable their activation via a control unit, so as to reposition the partP if necessary. The first detection device20 further or alternatively makes it possible to determine the dimensions of the surfaceS. The dimensions of the surfaceS include its precise delimitation, as materialized by its outline. The outline can for example be materialized by a relief or a change in surface condition. The dimensions of the surfaceSalso include its surface condition, including possible machining defects, unevenness, roughness, granularity or any other characteristic likely to impact the quantityQof materialM to be placed there.

[0026] The first detection device 20 is preferably a non-touch device, making it possible to perform the required detections without contact with the part P. It may for example comprise a vision system 21, capable of visualizing the location of the part P on the laying surface 40 as well as its dimensions, in particular its three-dimensional dimensions. Such a vision system 21 may for example comprise a 2.5D or 2D1/2 vision system. It may alternatively comprise a 2D camera associated with a laser measuring device making it possible to visualize the three-dimensional variations. Alternatively, the vision system 21 may comprise one or more matrix sensors, such as CCD or CMOS type sensors. It may alternatively comprise a line laser making it possible to map the three-dimensional dimensions of the surface S. It is understood that any suitable alternative may be used for this purpose. The first detection device 20 may for example be arranged above the laying surface 40, vertically. It may be integral with a fixed support of the dispensing device 1. However, it may include a focusing or focal variation means if necessary. The first detection device 20 may also be movable in translation along the vertical axis z or along one or more of the axes of the xy plane.

[0027] The first detection device20 thus makes it possible to determine the quantity of materialM to be deposited on the surfaceS based on its actual three-dimensional profile. The three-dimensional profile of each surfaceS is recorded in a database60 and analyzed so as to deduce a quantityQ of materialM to be dispensed.

[0028] The dispensing device1 according to the present description further comprises a second detection device30 for detecting the position of the injection needle11 relative to the surfaceS. The position of the injection needle11 may not be directly deduced from the orientation and position of the injection system10 relative to the x, y and z axes. The injection needles11 must be changed regularly. Their alignment and/or their curvature may vary from one to the other, modifying the relative position of the end of the injection needle11 relative to the rest of the injection system10. The second detection device30 thus makes it possible to precisely locate the end of the injection needle11 in the coordinate system of the dispensing device1. Where appropriate, the position and/or orientation of the injection system10 may be modulated as a function of the position of the injection needle11 actually determined by the second detection device30. The second detection device30 comprises, for example, one or more cameras or optical sensors enabling the spatial localization of the injection needle11.

[0029] The position of the injection needle 11, as determined by the second detection device 30, thus serves as a reference or calibration, making it possible to adjust the position of the placement surface 40 so as to correctly position a part P for the material dispensing operation M.

[0030] The second detection device 30 can further take an image of the end of the injection needle 11 to determine its quality or its state of degradation. The image can be compared to a reference image, stored in a database, so as to deduce a state of wear or degradation. An alert can be issued when the quality of the injection needle 11 does not correspond to the pre-established standards, and encourage its replacement. The alert can be visual or audible.

[0031] According to one embodiment, one or other of the first20and second30detection devices further makes it possible to control the quality of the deposition of materialMon the surfaceS. The quality of the deposition is in particular defined by the three-dimensional shape of the surface of the materialMdeposited, such as its curvature, concave or convex, and its homogeneity.

[0032] Alternatively, the dispensing device1 may comprise an independent control system50, additional to the first20 and second30 detection devices. Such an independent control system50 thus makes it possible to determine the quality of the deposition of materialM on a surfaceS, in particular by measuring the curvature and/or the homogeneity of its surface. In addition or alternatively, the independent control system50 may be adapted to measure the quality of the luminescence of the materialM deposited. The quality of the luminescence, the homogeneity of the luminescence over the entire deposit as well as its intensity. Figure 3 schematically shows the arrangement of the main elements of the dispensing device1.

[0033] Either of the first20, second30detection devices, and independent control system50if present, can be used as an injection servo system, in particular when it allows the quality of the material depositionM to be controlled. The dispensation of materialM can thus be viewed live and analyzed. The deposition can for example be sequentially compared to a reference depositionRstored in a database60. The injection can thus be stopped when the material depositionMcorresponds to the reference image. Such an arrangement is advantageous during continuous line deposition for example.

[0034] Alternatively, the dispensing device 1 comprises an independent servo system 80 allowing the dispensing of material M to be viewed online and in real time.

[0035] The dispensing device1 may further comprise one or more databases60, comprising for example the profile of the partsPalready processed, the quantityQof materialMdeposited, its nature, and/or the quality of material depositionMon each partP. The database60 may further enable a posteriori inspection of the parts already produced for control or diagnostic purposes.

[0036] The dispensing device1 further comprises at least one control unit70, provided with suitable calculation means for determining for each surfaceS the quantityQ of materialM to be deposited, on the basis of its profile determined by the first detection device20. The control unit70 may for example comprise volume calculation software, considering one or more of the parameters such as the actual profile of the surfaceS to be covered, the nature of the materialM, including its density, its viscosity, the size of the particles it may contain, their concentration, or a combination of several of these characteristics, and the shape of the surface to be obtained after deposition of the materialM. The control unit70 is connected to at least one of the first20, second30detection devices, the injection system10, the independent control system50if present, at least one database60, and the independent servo system80if present. The control unit 70 can thus compile the data received by the detection devices and compare them with the data in the database 60. It also makes it possible to control one or more of the mobile elements of the dispensing device 1, such as the orientation and inclination of the injection system 10, its activation according to the criteria calculated on the basis of the recorded data, the mobile supports 41, 42. The control unit 70 can also make it possible to monitor the quality status of the injection needle 11, by comparing it to a reference, and produce an alert below a certain quality threshold. Alternatively or in addition, the control unit 70 can comprise a learning module 70', making it possible for example to determine the quantity Q of material M to be deposited according to the result to be obtained. Such a learning module can be of the "deep learning" type, and be based on the selection of accepted and rejected parts P.

[0037] The dispensing device1 may further comprise a control unit90 acting as an interface between a user and the dispensing device1. The control unit90 comprises, for example, at least one display means such as a screen or any equivalent device, at least one means for entering commands or data such as a keyboard, a touch screen or any other equivalent device and suitable calculation and transmission means such as software and digital programs.

[0038] According to one embodiment, the dispensing device 1 comprises more than one injection system 10 that can be used for the same surface S of a part P. Several different materials M can thus be arranged sequentially on a surface S, each of the materials being stored in different injection systems. It is specified here that in the case where several materials M are injected, not all are necessarily multi-component and/or viscous. Preferably at least one of the materials M is a multi-component or viscous material. However, it is possible to inject a first layer of a first material such as an adhesion promoter or a surface treatment before injecting a multi-component material. The same material M can be injected twice or more than twice.

[0039] The dispensing device1 may further comprise one or more environmental control systems so as to control at least one of the parameters such as temperature, humidity, degree of static charge, atmospheric pressure. For this purpose, the laying surface40, the injection system and the detection devices may be included in a regulated enclosure.

[0040] The dispensing device1 may further comprise one or more integrated modules for fixing or hardening the deposited materialM, via a light irradiation process or a thermal process. For this purpose, it may comprise a UV or UV-visible source for example for polymerizing photo-crosslinkable materials.

[0041] The dispensing device1 may further comprise an independent device for monitoring the luminescence of the deposited materialM. Such a device may for example comprise a dark enclosure, provided with a sensor suitable for determining the intensity and/or the homogeneity of the luminescence of the materialM. The enclosure may further comprise a light irradiation source, making it possible to irradiate a sample in a suitable wavelength range.

[0042] The present description also covers a dispensing method comprising a profiling step a) for defining the actual profile of a surface S to be covered with material M. The actual profile can be obtained by means of a first detection device 20 as described above. The profiling step a) can be combined with a step of positioning the part P to be treated, or a surface S of the part P, along one or other of the x, y and z axes of the dispensing device.

[0043] The method comprises a step b) of determining the quantity Q of a material M to be deposited on the surface S, as a function of its actual profile determined during the profiling step a). The quantity Q of material M can be directly calculated on the basis of the actual profile of the surface S, for example by means of a modeling of this profile. Alternatively, the quantity Q can be deduced from a database resulting from a prior experimental plan, or from dispensing operations already carried out.

[0044] The method may comprise a calibration step c) for locating the tip of the injection needle 11 in the reference frame of the dispensing device 1. The calibration step may be carried out by means of a second detection device 30 as described above. The calibration step may comprise adjusting the position and/or orientation of the injection system 10.

[0045] The calibration step c) may be accompanied by a step of verifying the quality of the injection needle 11, and where appropriate, an alert regarding a level of degradation of the injection needle beyond a predetermined threshold.

[0046] The method described here comprises an injection step d) comprising the activation of an injection system for dispensing the quantity Q of material M defined during step b). The injection system may be as described above.

[0047] The method comprises a visualization step e) of the material depositM carried out during the injection step d). The visualization can be carried out in real time by means of a suitable optical device. In this case, the visualization can be carried out by means of an independent servo system80 or any other means described above. Alternatively, the visualization step allows a control at the end of injection of the surface of materialM dispensed. One or other of the devices mentioned for this purpose can then be used. During the visualization step e), the surface of materialM can be recorded and stored in a database60. It can also be compared to a pre-established standard.

[0048] The method further comprises a selection step f) for accepting or rejecting a partPprocessed during the previous steps. The selection step f) can be carried out manually by an operator on the basis of a pre-established standard. Figure 4 shows an example of a defective processed part, compared to a standardR. Alternatively, the selection can be carried out automatically by means of suitable algorithms.

[0049] According to the present method, partsPfrom several different batches can be processed in a reproducible manner. Furthermore, partsPprocessed on several dispensing devices1can be produced identically.

[0050] One or more of steps a) to f) may be repeated one or more times for the same surface S. The injection step d) may be reproduced with the same material M or a different material. For example, a first profiling step a1) may be performed on the bare surface S, followed by a first step b1) of determining the quantity Q of a first material M to be deposited, a first calibration step c1) and a first injection step d1). Following the first injection d1), a visualization step e1) and selection step f1) may be performed. Alternatively or in addition, if the deposition is judged to meet expectations, a second injection step d2) may be performed with the same material M or a different material. Optionally, a second profiling step a2), a second step b2) of determining the quantity of material to be deposited, or a second calibration step c2), or several of the steps a2), b2) and c2) can be carried out before the second injection step d2).

[0051] One or more transformation steps g) for transforming the deposited materialM, if necessary, may be included in the method. A first injection step d1) may for example be followed by a first transformation step g1) for solidifying the materialM deposited on the surface S. The transformation may be carried out under conditions adapted to the needs, for example under thermal conditions or under UV irradiation, for polymerizing the materialM. Other transformations may however be envisaged. A transformation step g) may be provided immediately after an injection step d) or immediately after a visualization step e) or immediately after a selection step f).

[0052] The method of the present description may further comprise a control step h) for verifying the optical qualities of the deposit of material M, preferably at the end of the process. Figure 5 shows a part whose luminescence is controlled. The homogeneity or the intensity of the luminescence or both can be controlled and compared to pre-established reference values. The control step h) may be combined with a selection step for accepting or rejecting a part according to its similarity to a reference standard.

[0053] The present invention also covers a partP comprising at least one surfaceS covered by one or more materialsM by means of the dispensing device1 described here or according to the method described here. The part P may be for example a watch component such as a hand, a watch dial index, or an ornament or the materialM is a luminescent or phosphorescent product. The partP may be an eyewear item, a decorative accessory such as a piece of jewelry or an item of adornment, a writing tool, or any other element of an aesthetic nature. The present invention covers in particular any object comprising at least two identical partsP each comprising at least one surfaceS covered with a materialM. In this case, no difference is visible between the different surfaces of materialM covering the different surfacesS of the different partsP of the object. Such an object designates for example a watch dial where several indices each represent a partP.

Reference numbers used in the figures

[0054] 1 Dispensing device 10 Injection system 11 Injection needle 20 First detection device 21 Vision system 30 Second detection device 40 Resting surface 41, 42 Adjustable supports 50 Independent control system 60 Database 70 Control unit 80 Independent servo system 90 Control unit P Part M Material R Reference standard S Surface

Claims (14)

1. Dispensing device (1) adapted to dispensing a material (M) onto a surface (S) of one or more parts (P), comprising: – at least one laying surface (40) adapted to receive the one or more parts (P); – an injection system (10), comprising an injection needle (11) adapted to dispensing a quantity (Q) of said material (M); – a first detection device (20) adapted to determine the three-dimensional dimensions of said one or more parts (P) so as to determine the quantity (Q) of material to be deposited on the surface (S) according to its actual three-dimensional profile, further making it possible to determine the position of said one or more parts (P); – a second detection device (30) making it possible to detect the position and/or the quality of the end of the injection needle (11). 2. Device according to claim 1, in which said first detection device comprises a vision system (21), capable of determining the location of the part on the laying surface along the x and y axes and a means of analyzing without contact the surface (S) of the part (P) so as to determine the quantity (Q) of material to be deposited. 3. Device according to one of claims 1 and 2, in which the first detection device comprises a single means for analyzing without contact the surface (S) of the part (P) so as to determine the quantity of material to be deposited, and to determine the location of the part on the support along the x and y axes. 4. Device according to one of claims 1 and 2, in which the first detection device (20) contains – a 2D 1⁄2 vision system arranged above the part support along a vertical axis, – the combination of a 2D camera and a depth measuring laser, – a matrix sensor, or – a line laser. 5. Device according to one of claims 1 to 4, where one or other of the first (20) and second (30) detection devices further allows a control of the quality of the material (M) after deposition on the surface (S) of the part. defined by the three-dimensional shape of the surface of the deposited material (M). 6. Device according to one of claims 1 to 5, where the second detection device (30) comprises a calibration camera making it possible to locate the end of the injection needle (11) in space and/or to determine the quality status of the end of the injection needle (11). 7. Device according to one of claims 1 to 6, in which the injection system (10) is of the volumetric, time-pressure, or point-by-point micro-injection type. 8. Device according to one of claims 1 to 5, the laying surface (40), the injection system and the first and second detection devices being included in a regulated enclosure capable of regulating at least one parameter among the temperature, the hygrometry, the degree of static charge and the atmospheric pressure. 9. Device according to one of claims 1 to 6, further comprising a system for controlling the luminescence and/or pigmentation of the deposit made. 10. Device according to one of claims 1 to 9, further comprising an artificial intelligence or learning module, trained to automatically differentiate between acceptable parts and unacceptable parts after the deposition of the material. 11. Method for automated deposition of a material (M) on a surface (S) of one or more parts (P), by means of a dispensing device (1) according to one of claims 1 to 10, comprising: – a profiling step a) for defining the actual profile of a surface (S) to be covered with material (M), carried out by means of the first detection device (20), – a step b) for determining the quantity (Q) of a material (M) to be deposited on the surface (S), as a function of its actual profile determined during the profiling step a), carried out by means of the first detection device (20), – a calibration step c) for locating the tip of the injection needle (11), carried out by means of the second detection device (30) and – an injection step d) comprising the activation of the injection system, comprising an injection needle (11), for dispensing the quantity (Q) of material (M) defined during the step b). 12. Method according to claim 11, further comprising a visualization step e) of the deposition of material (M) carried out during the injection step d) and a selection step f) of rejection of the defective parts. 13. Method according to one of claims 11 and 12, further comprising a transformation step g) via a light irradiation process or a thermal process making it possible to fix or harden the deposit (M). 14. Method according to one of claims 11 to 13, in which one or more of the steps are repeated at least once.