Patent ID: 11945043
Assignee: CONCEPT LASER GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC B  G  Y | IPC B  G

Claim 0:
1. An optical system for an apparatus for additively manufacturing three-dimensional objects, the optical system comprising:
a first optical assembly comprising or configured as a first flat-field lens, the first flat-field lens having a first nominal scan field with a first flat focal plane;
a first scan field expansion assembly comprising one or more first field-expanding optical elements, the one or more first field-expanding optical elements secured to a field-expansion housing and having a flat portion and a curved portion at radially different regions;
a beam generation device configured to generate an energy beam;
a scanner arranged proximal to the beam generation device, the scanner directing the energy beam received from the beam generation device at a first angle onto the flat portion and the curved portion of the one or more first field-expanding optical elements at a different, second angle, the curved portion configured to expand the first nominal scan field to a first expanded scan field coinciding with the first flat focal plane,
wherein the first expanded scan field has a cross-sectional width and/or area that exceeds a corresponding cross-sectional width and/or area of the first nominal scan field.