An additive manufacturing apparatus

An additive manufacturing apparatus for additively manufacturing a three-dimensional object by photocuring a photocurable resin which can be cured at a specific wavelength, the apparatus comprising:

• a container device, the container device delimiting a receiving volume for receiving a photocurable resin which can be cured at a specific wavelength,
• at least one first radiation device configured to generate one or more light images corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more light images having a first wavelength and a first polarization, the first wavelength particularly corresponding to the specific wavelength of the photocurable resin;
• at least one second radiation device configured to generate one or more directed light beams corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more directed light beams having a second wavelength and a second polarization different from the first polarization, the second wavelength particularly corresponding to the specific wavelength of the photocurable resin;
• at least one optical device configured to direct the one or more light images generated by the at least one first radiation device and the one or more light beams generated by the at least one second radiation device towards the container device;
• at least one detection device configured to detect one or more secondary images of the one or more light images generated by the at least one first radiation device which secondary images are not directed towards the container device and/or one or more secondary beams of the one or more light beams generated by the at least one second radiation device which secondary beams are not directed towards the container device;
• a control device configured to analyze the one or more detected secondary images and/or the one or more detected secondary beams to determine a calibration state of the at least one first radiation device and/or the at least one second radiation device;
• or
• at least one first radiation device configured to generate one or more light images corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more light images having a first wavelength and a first polarization, the first wavelength particularly corresponding to the specific wavelength of the photocurable resin,
• at least one other first radiation device configured to generate one or more light images corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more light images having a second wavelength and a second polarization different from the first polarization, the second wavelength particularly corresponding to the specific wavelength of the photocurable resin,
• at least one optical device configured to direct the one or more light images generated by the first radiation devices towards the container device;
• at least one detection device configured to detect one or more secondary images of the one or more light images generated by at least one first radiation device which secondary images are not directed towards the container device ;
• a control device configured to analyze the one or more detected secondary images to determine a calibration state of at least one first radiation device;
• or
• at least one second radiation device configured to generate one or more directed light beams corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more directed light beams having a first wavelength and a first polarization, the first wavelength particularly corresponding to the specific wavelength of the photocurable resin;
• at least one other second radiation device configured to generate one or more directed light beams corresponding to at least a part of a cross-section of a three-dimensional object to be additively manufactured with the apparatus, the one or more directed light beams having a second wavelength and a second polarization different from the first polarization, the second wavelength particularly corresponding to the specific wavelength of the photocurable resin;
• at least one optical device configured to direct the one or more directed light beams generated by the second radiation devices towards the container device;
• at least one detection device configured to detect one or more secondary beams of the one or more directed light beams generated by at least one second radiation device which secondary beams are not directed towards the container device;
• a control device configured to analyze the one or more detected secondary beams to determine a calibration state of at least one second radiation device.