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US 11,112,615 B2Granted
Device and method for the generation of a double or multiple spot in laser material processing
AssigneeII-Vi Delaware, Inc.
InventorsAxel Heinrici, Goran Bjelajac
Life of this patent
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Abstract
The invention relates to a device and a method for generating a multiple spot during laser material processing. According to the present invention, the power distribution is selected by pushing at least a first mirror into the laser beam. The light beam always falls on only one side of the mirror, so that the mirror can be produced easily and economically.
Claims15
A device for variable beam shaping of a light beam, comprising:
- a. an entry aperture with an entry cross-section and with an entry axis which passes centrally through the entry aperture, a continuation of the entry cross-section along the entry axis defining a free propagation volume;
- b. a collimation optics arranged between entrance aperture and an arrangement of mirrors;
- c. the arrangement of mirrors comprising at least
- i. a first mirror, the first mirror having a reflecting surface only on a side facing the laser beam and being arranged at least partially in a collimated laser beam for re-reflection of a partial beam;
- ii. a second mirror with a reflecting surface in the direction of the reflecting surface of the first mirror to deflect the reflected partial beam of the collimated laser beam;
- iii. a third mirror comprising a reflecting surface in the direction of the second mirror to reflect the reflected partial beam of the collimated laser beam back next to the unreflected partial beam of the collimated laser beam;
- d. a displacement device connected to at least one mirror of the array of mirrors to move it into the undivided collimated laser beam;
- e. an angle adjusting device connected to at least one mirror of the array of mirrors for its rotation;
- and
- f. focusing optics arranged behind the third mirror for focusing the reflected partial beam of the laser beam and the unreflected partial beam of the collimated laser beam with at least one double focus.
7 more elements
A method for generating a multiple spot in laser material processing, comprising the steps
- a. Collimation of a divergent laser beam by means of collimation optics;
- b. Displacement of at least a first mirror in a part of the collimated laser beam by a displacement device;
- c. Reflecting a partial beam of the collimated laser beam through the first mirror by means of a reflecting surface onto the reflecting surface of a second mirror;
- d. Reflecting the partial beam of the collimated laser beam through the second mirror by means of a reflecting surface onto the reflecting surface of a third mirror;
- e. Reflection of the partial beam of the collimated laser beam by the third mirror next to the unreflected partial beam of the collimated laser beam;
- f. Creating a difference angle between the reflected and the unreflected partial beam by rotating at least one of the mirrors;
- g. Focusing of reflected and unreflected partial beam of the collimated laser beam by means of focusing optics;
- h. Imaging a beam focus with at least a double focus on a workpiece to be processed.
5 more elements
Dependencies are inferred from the claim text.