Patent ID: 11958252
Assignee: 3D SYSTEMS, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 1:
2. A method for producing at least one solid-body layer on a support that can be rotated about an axis of rotation-, in accordance with predetermined geometry data,
a) wherein a container is provided, in which at least one material layer composed of a liquid, paste-like or powder-form material applied to a support wherein for irradiation of the material with radiation that solidifies the material, an emitter array having a number of N radiation emitters that are spaced apart from one another and face the material layer is provided, which emitters are arranged in matrix form, in emitter columns are offset parallel to one another, and emitter rows that are offset parallel to one another and run transverse to the emitter columns, wherein emitter columns are adjacent to one another in the circumferential direction of the axis of rotation are offset from one another in the expanse direction of the emitter columns, in each instance, in such a manner that the individual emitters of the emitter array are arranged at different radial distances DA(i) from the axis of rotation, wherein it holds true that:

DA(i)>DA(i+1)

where j∈[M . . . (M+N−1)]

b) wherein print dots (PM . . . PM+N) are assigned to the geometry data, which dots are offset from one another, in a matrix having multiple rows that run next to one another, in which a number of Q print dots are arranged, in each instance, in such a manner that the following holds true:

PA(j)>PA(j+1),

where j∈[M . . . (M+N−1)] and 1≤M≤Q−N,
wherein PA(j) is the radial distance of the jth print dot Pj of the row in question from the axis of rotation, and M is a whole number,

c) wherein for print dots Pk at which the solid-body layer is supposed to be present, radiation is emitted onto the material from the emitter Dk of the emitter array assigned to the print dot Pk in question, in each instance, wherein k is a whole number between M and M+N−1,
d) wherein the irradiation of the material takes place in print cycles in which the emitter array is triggered once, in each instance, at a trigger point assigned to the print cycle in question, for irradiation, and the support as well as the emitter array are offset relative to one another, in each instance, from print cycle to print cycle, by an angular distance with reference to the axis of rotation,
e) wherein printing of all the print dots PM . . . PM+N−1 of a row that are to be printed takes place in a number of print cycles that is greater than the number of emitter columns,
f) wherein the print cycle for each print dot to be printed is selected, in each instance, in such a manner that the angular difference between the rotational position of the trigger point of the print cycle and the rotational position in which the print dot to be printed is arranged with reference to the axis of rotation when the support is positioned at the trigger point relative to the emitter array is not greater, in terms of amount, than half the angular distance between the trigger points.