Verfahren und Vorrichtung zur Herstellung eines optischen Elements mit zumindest einem funktionalen Bereich, sowie Verwendung der Vorrichtung

Abstract

The present invention relates to a method for manufacturing an optical element (100) having at least one functional region using a 3D-printer, comprising the steps: forming a three-dimensional structure (50) of the optical element (100) using a 3D-printer such that the three-dimensional structure (100) has at least one microfluidic cavity (4) for receiving a functional substance (6); and filling the at least one microfluidic cavity (4) with the functional substance (6) for forming the at least one functional region.

In addition, the invention relates to a device for manufacturing an optical element (100) as well as a use of the device.

Claims

1. A method for manufacturing an optical element (100) having at least one functional region, comprising the steps: forming a three-dimensional structure (50) of the optical element (100) using a 3D-printer such that the three-dimensional structure (100) has at least one microfluidic cavity (4) for receiving a functional substance (6); and filling the at least one microfluidic cavity (4) with the functional substance (6) for forming the at least one functional region.

2. The method according to claim 1 wherein the at least one microfluidic cavity (4) is formed such that it can receive the functional substance (6) using capillary effects.

3. The method according to claim 1, wherein the filling of the at least one microfluidic cavity (4) with the functional substance (6) occurs using capillary effects.

4. The method according to claim 1, wherein the at least on microfluidic cavity (4) is formed such that it has an extent of at least 100 m.

5. The method according to claim 1, wherein the filling of the at least one microfluidic cavity (4) comprises: wetting the at least one microfluidic cavity of the formed three-dimensional structure (50) with the functional substance (6); and/or introducing the functional substance (6) into the at least one microfluidic cavity (4).

6. The method according to one of the preceding claims, wherein filling of the at least one microfluidic cavity (4) with the functional substance (6) comprises allowing the drawing in of the functional substance (6) and/or application of pressure and/or bombardment with micro-droplets.

7. The method according to claim 1, further comprising: hardening and/or drying of the functional substance (6).

8. The method according to claim 1, further comprising: at least partial removal of the functional substance (6).

9. A device for manufacturing an optical element (100) having at least one functional region, comprising: a 3D-printer for forming a three-dimensional structure (50) of the optical element (100), wherein the three-dimensional structure (50) has at least one microfluidic cavity (4) and wherein the at least one microfluidic cavity (4) is suited for receiving a functional substance (6); and a means for wetting and/or filling the at least one microfluidic cavity (4) of the formed three-dimensional structure (50) with the functional substance (6).

10. The device according to claim 9, wherein the at least one microfluidic cavity (4) has an extent of less than 100 m,

11. The device according to claim 9, further comprising: a pressure-generating unit for application of pressure, by means of which the functional substance (6) is introduced to the at least one microfluidic cavity (4) of the at least one functional region.

12. The use of the device according to one of claims 9 for manufacturing an optical element (100) having at least one functional region.

13. The use according to claim 12, wherein the three-dimensional structure (50) and the at least one microfluidic cavity (4) of the optical element (100) are manufactured by means of a 3D-lithography system.

14. The use according to claim 12, wherein the three-dimensional structure (50) and the at least one microfluidic cavity (4) of the optical element (100) are manufactured by means of a 3D-laser-lithography system.

15. The use according to claim 14, wherein the 3D-laser-lithography system is based on a two-photon-polymerization of a UV-hardening photoresist.

Description

SHORT DESCRIPTION OF THE DRAWINGS

[0051] FIG. 1 shows a schematic flowchart of the method according to the invention according to a preferred embodiment;

[0052] FIG. 2a shows a schematic drawing of an exemplary three-dimensional structure with a micro-cavity which can be printed according to the method of the invention or the device according to the invention by means of a 3-D printer so as to manufacture a functional optical element;

[0053] FIG. 2b shows a schematic drawing of an exemplary finished optical dement which is created by filling of the micro-cavity of the three-dimensional structure of FIG. 2a with a functional liquid;

[0054] FIG. 3a shows a schematic drawing of a further exemplary three-dimensional structure with micro-cavities, which according to the method of the invention or the device according to the invention can be printed by means of a 3-D printer so as to manufacture a functional optical element;

[0055] FIG. 3b shows a schematic drawing of the filling process of the micro-cavities of the three-dimensional structure of FIG. 3a with a functional liquid;

[0056] FIG. 3c shows a schematic drawing of a further exemplary finished optical element which is created by filling of the micro-cavities of the three-dimensional structure of FIG. 3a or 3b with a functional liquid;

[0057] FIG. 4a shows a schematic sketch of the functioning of the optical element of FIG. 3c;

[0058] FIG. 4b shows a CAD construction belonging to an optical element of FIG. 3c.

DETAILED DESCRIPTION OF THE DRAWINGS

[0059] FIG. 1 shows a schematic flowchart of the method according to the invention for manufacturing an optical element with at least one functional region according to a preferred embodiment.

[0060] In a first step S1 a three-dimensional structure of the optical element is formed using a 3-D printer by providing a layout or design of the optical element to be manufactured in the form of a file. The layout according to the invention has at least one microfluidic cavity for forming a functional region. The forming or printing of the three-dimensional structure using the 3-D printer proceeds on the basis of the provided layout or file which is sent to the 3-D printer. That is, the formation of the three-dimensional structure proceeds in such a way that the three-dimensional structure has at least one microfluidic cavity. The at least one microfluidic cavity is suited for receiving a functional substance or liquid that forms the functionality of the optical element or that is used to form the functionality of the optical element.

[0061] Subsequently the at least one microfluidic cavity of the formed three-dimensional structure is filled with the functional substance. The filling proceeds in particular by means of a step S2 in which see at least one microfluidic cavity, for example using a dispenser or a cuvette, is wetted, that is, in which the functional liquid is brought into contact or touch with specific regions of the three-dimensional structure, and a step S3, in which the functional substance is introduced into the at least one microfluidic cavity for forming the at least one functional region. The steps S1 and S2 of FIG. 1 can thus be described generally as filling of the at least one microfluidic substance.

[0062] The filling or wetting of a microfluidic cavity can for example comprise dripping of the liquid into the at least one microfluidic cavity or its surroundings. By means of the onset or exploitation of capillary effects or by means of the effects of capillary forces in association with the at least one microfluidic cavity, the functional substance or liquid is introduced or drawn into the at least one microfluidic cavity.

[0063] Alternatively or additionally, an external pressure can also be applied so as to introduce the liquids into the desired hollow spaces. In particular the functional substance or liquid can be introduced into the at least one microfluidic cavity using pressure.

[0064] Thus the invention provides, in addition to the optically affective transparent structure, the printing of microfluidic cavities that subsequently are filled by means of a dispenser with a suitable functional substance or liquid. This liquid can for example in specific wavelength ranges or broadband be absorbent or reflective, can make available a specific refraction index or Abbe coefficient or can be diluted with functional nanoparticles. The liquid can subsequently harden, dry, or color the surface, and drain or volatize.

[0065] The method described herein makes it possible to broaden 3D-printed optics with new functionalities that until now were not possible. The method here is simple and effective. Optical elements with additionally functionalized regions have potentially a significantly enlarged performance capacity. For instance, by way of example some designs function when an absorbing aperture is attached to a specific point or the lens edge is blackened.

[0066] Furthermore there is the capability of integrating new materials effectively into the design, which until now was not readily feasible. Thus for example by using two different dispersive materials, one printed and one introduced subsequently, the chromatic aberration of an optical system can be corrected.

[0067] FIG. 2a shows a schematic drawing of an exemplary three-dimensional structure 50, namely a lens 2, which according to the method of the invention or the device according to the invention, can be made using a 3-D printer.

[0068] So that a functional optical element 100 can be manufactured from the three-dimensional structure 50, the three-dimensional structure has a microfluidic cavity 4 that can be wetted or filled with a functional substance 6. As is suggested in FIG. 2a, this filling can for example occur by droplet filling from above.

[0069] FIG. 2b shows a schematic drawing of the finished optical element 100, namely a lens with aperture. The aperture is formed in that the microfluidic cavity 4 is filled with the functional substance 6. In this shown example, the functional substance or liquid 6 can harden after a specific time.

[0070] FIGS. 3a to 3c show schematic drawings for comparatively complex production of an exemplary lens system with aperture and edge blackening.

[0071] Here in FIG. 3a the necessary three-dimensional structure 50 for this is shown, which also can be designated as the base or raw structure. This raw structure 50 comprises three lenses 10, 20, 30, which are held in a casing 12 printed at the same time. The casing 12 has lateral openings 15 through which the non-hardened or non-polymerized paint can drain from the lens intermediate spaces 13 after the writing process or 3D printing process. In addition there are hollow spaces, that is, microfluidic cavities 4, in the casing 12, which have no connection to the lens intermediate spaces 13. These microfluidic cavities 4 after the 3D-printing are filled with a functional substance or liquid 6 (in FIG. 3c the hollow spaces are filled with a function liquid and therefore shown hatched). In this example, the filling can be via a cannula, which is flanged to a lateral opening 17.

[0072] In FIG. 3b, the filling process of the microfluidic cavities 4 of the three-dimensional structure 50 of FIG. 3a with a functional substance or liquid 6 is shown schematically. Via a cannula 40, of which only the tip is shown here, the liquid 6, in this example for producing the aperture and for blackening of the lens edge, is injected using pressure and/or suctioned in by capillary forces. The pressure with which the liquid 6 is introduced can for example be applied via a closed print-controller in a very defined manner.

[0073] FIG. 3c finally shows the finished optical element 100, in this example a three-lens objective, in which an aperture 32 and a blackened edge 34 were realized.

[0074] FIG. 4a illustrates the functional principle or the optical design of the system manufactured with the method according to the invention of FIGS. 3a to 3c, while in FIG. 4b the associated CAD (computer-aided design) construction is shown.

[0075] In both FIGS. 4a and 4b, the three lenses 10, 20, and 30 respectively may be seen. As shown in FIG. 4a, light beams that fall from above on the lens system with different directions of incidence, are focused on different spots. Here the reference symbols 43 to 47 in FIG. 4a symbolize the light rays with different directions of incidence. Such optics can be realized using an aperture 32 (see FIG. 3c), as the light otherwise would strike the image plane via an undesired path and thus degrade the image quality. The manufacture of such an aperture in a simple and precise manner is possible with the device according to the invention.

REFERENCE SYMBOLS LIST

[0076] 2 lens [0077] 4 microfluidic cavity/hollow space [0078] 6 functional substance/functional liquid [0079] 10 lens [0080] 12 casing [0081] 13 intermediate space [0082] 15 opening [0083] 17 opening [0084] 20 lens [0085] 30 lens [0086] 32 aperture [0087] 34 blackened edge [0088] 40 dispenser/cannula [0089] 43 light beam [0090] 44 light beam [0091] 45 light beam [0092] 46 light beam [0093] 47 light beam [0094] 50 three-dimensional structure/base structure/raw structure [0095] 100 optical or micro-optical element/optics or micro-optics [0096] S10 forming of a three-dimensional structure [0097] S20 wetting of at least one microfluidic cavity of the formed three-dimensional structure with a functional substance [0098] S30 introduction of a functional substance into the at least one microfluidic cavity