Exposure device for an apparatus for the additive production of three-dimensional objects

Patent metadata

Field	Value
Publication number	US-11169339-B2
Application number	US-201815917312-A
Country	US
Kind code	B2
Filing date	Mar 9, 2018
Priority date	Mar 9, 2017
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

Exposure device (6) for an apparatus (1) for the additive production of three-dimensional objects (2), comprising: —at least one energy beam generating device (7), which is configured in order to generate an energy beam (4), —at least one light-guide fibre (8), which is optically couplable or coupled to the energy beam generating device (7) and is configured in order to guide at least one energy beam (4), introduced into it, between an input region (8a) of the light-guide fibre (8) and an output region (8b) of the light-guide fibre (8), the light-guide fibre (8) comprising a plurality of fibre cores (15), at least one energy beam (4) being introducible or introduced into each fibre core (15).

First claim

The invention claimed is:

1. An exposure device for use with an apparatus for additively manufacturing three-dimensional objects, the exposure device comprising:
a plurality of energy beam generating devices respectively configured to generate an energy beam;
a light-guide fiber comprising a plurality of fiber cores respectively configured to guide at least one energy beam from an input region of the light-guide fiber to an output region of the light-guide fiber, respective ones of the plurality of fiber cores being optically couplable or coupled to a corresponding one of the plurality of energy beam generating devices, at least one energy beam being introducible or introduced into respective ones of the plurality of fiber cores; and
a control device, the control device configured to:
form a selected energy beam-exposure pattern comprising the plurality of energy beams, by an alternating operation of the plurality of energy beam generating devices and a defined control of the energy beam properties of the energy beams introducible or introduced into the plurality of fiber cores, the alternating operation of the plurality of energy beam generating devices and the defined control of the energy beam properties comprising a function of time and/or position of the energy beams; and
carry out, by the alternating operation of the plurality of energy beam generating devices and the defined control of the energy beam properties of the energy beams introducible or introduced into the plurality of fiber cores, selective exposure and consequent selective solidification of a construction material layer with a first energy beam output from at least one centrally arranged fiber core of the plurality of fiber cores, and thermal pretreatment, at least in sections, of a construction material layer to be selectively solidified and/or thermal after-treatment, at least in sections, of a selectively solidified construction material layer with one or more further energy beams output from at least one off-center fiber core of the plurality of fiber cores.

2. The exposure device of claim 1 , comprising:
at least one energy beam splitting device configured to split an energy beam into a plurality of energy beams differing in relation to at least one energy beam parameter, wherein at least some of the plurality of fiber cores are optically couplable or coupled to at least one of the plurality of energy beam generating devices indirectly with the interposition of the least one energy beam splitting device.

3. The exposure device of claim 1 , wherein respective ones of the plurality of fiber cores have the same cross-sectional fiber core geometries relative to one another.

4. The exposure device of claim 1 , wherein respective ones of the plurality of fiber cores are configured or arranged symmetrically over the cross-sectional area of the light-guide fiber.

5. The exposure device of claim 1 , wherein starting with a light-guide fiber having a round or roundish cross-sectional area, at least some of the plurality of fiber cores are configured or arranged at different radial positions with respect to a central axis of the light-guide fiber.

6. The exposure device of claim 1 , wherein at least some of the plurality of the fiber cores are configured or arranged equidistantly relative to one another.

7. The exposure device of claim 1 , wherein respective ones of the plurality of energy beam generating devices are configured to generate respectively different energy beams with different energy beam properties relative to one another.

8. The exposure device of claim 1 , wherein an energy beam from a corresponding one of the plurality of energy beam generating devices is introducible or introduced into at least two of the plurality of fiber cores.

9. The exposure device of claim 1 , wherein the control device is configured to form a defined profile of the energy radiation which can be or is output overall from the exposure device, by defined control of the energy beam properties of the plurality of energy beams introducible or introduced into respective ones of the plurality of fiber cores.

10. The exposure device of claim 1 , wherein respective ones of the plurality of fiber cores have different cross-sectional fiber core geometries relative to one another.

11. The exposure device of claim 1 , wherein respective ones of the plurality of fiber cores are configured or arranged asymmetrically over the cross-sectional area of the light-guide fiber.

12. An apparatus for additively manufacturing three-dimensional objects, the apparatus comprising:
a process chamber;
a construction module;
an exposure device; and
a control device;
wherein the exposure device comprises:
a plurality of energy beam generating devices respectively configured to generate an energy beam; and
a light-guide fiber comprising a plurality of fiber cores respectively configured to guide at least one energy beam from an input region of the light-guide fiber to an output region of the light-guide fiber, respective ones of the plurality of fiber cores being optically couplable or coupled to a corresponding one of the plurality of energy beam generating devices, at least one energy beam being introducible or introduced into respective ones of the plurality of fiber cores;

wherein the control device is configured to form a selected energy beam-exposure pattern comprising the plurality of energy beams, by an alternating operation of the plurality of energy beam generating devices and a defined control of the energy beam properties of the energy beams introducible or introduced into the plurality of fiber cores, the alternating operation of the plurality of energy beam generating devices and the defined control of the energy beam properties comprising a function of time and/or position of the energy beams;
wherein respective ones of the plurality of energy beam generating devices are configured to generate respectively different energy beams with different energy beam properties relative to one another; and
wherein the control device is further configured, by the alternating operation of the plurality of energy beam generating devices and the defined control of the energy beam properties of the energy beams introducible or introduced into the plurality of fiber cores, to carry out selective exposure and consequent selective solidification of a construction material layer with a first energy beam output from at least one centrally arranged fiber core of the plurality of fiber cores, and to carry out thermal pretreatment, at least in sections, of a construction material layer to be selectively solidified and/or thermal after-treatment, at least in sections, of a selectively solidified construction material layer with one or more further energy beams output from at least one off-center fiber core from among the plurality of fiber cores.

13. The apparatus of claim 12 , wherein the exposure device comprises:
at least one energy beam splitting device configured to split an energy beam into a plurality of energy beams differing in relation to at least one energy beam parameter, wherein the at least some of the plurality of fiber cores are optically couplable or coupled to at least one of the plurality of energy beam generating devices indirectly with the interposition of the least one energy beam splitting device.

14. The apparatus of claim 12 , wherein the plurality of fiber cores have the same or different cross-sectional fiber core geometries relative to one another.

15. The apparatus of claim 12 , wherein the plurality of fiber cores are configured or arranged symmetrically or asymmetric

Assignees

• Cl Schutzrechtsverwaltungs Gmbh
• Concept Laser Gmbh

Inventors

• Pontiller-Schymura Peter

Classifications

• G02B6/4296 Primary

  coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources · CPC title

• B22F12/49

  Scanners · CPC title

• B22F12/45

  Two or more · CPC title

• B22F12/44

  characterised by the configuration of the radiation means · CPC title

• B22F12/13

  to preheat the material · CPC title