Laser casting apparatus and method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasaki Kondo, Shigeki Maekawa
Life of this patent
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Abstract
A laser casting apparatus includes a laser light source, a phase disturbing device for disturbing a phase of laser light output from the laser light source, and a beam forming device for forming a beam of a predetermined shape. The formed beam is cast on a work after decomposing the laser light in to beams each having a small area and then superposing the decomposed beams. The phase disturbing device disturbs the phase of the light in a manner so that the superimposed beam formed of the decomposed beams has a uniform energy distribution without interference fringes.
Claims20
A laser casting apparatus, comprising:
- a laser light source for outputting laser light;
- a beam forming means for decomposing the laser light from said laser light source into decomposed beams each having a predetermined shape and superposing the decomposed beams so as to form a superposed beam of laser light having a predetermined shape and a uniform energy distribution for casting on a work;
- and
- a phase disturbing means for disturbing the phase of the laser light output from said laser light source so that when said beam forming means superposes the decomposed beams and forms the superposed beam of laser light having a predetermined shape and a uniform energy distribution the generation of interference fringes in the energy intensity distribution of the laser light is avoided.
A method of casting laser light comprising the steps of:
- emitting a laser light from a laser light source;
- decomposing the laser light from the laser light source into decomposed beams each having a predetermined shape;
- superposing the decomposed beams so as to form a superposed beam of laser light having a predetermined shape and a uniform energy distribution;
- casting the superposed beam of laser light on a work;
- and
- disturbing the phase of the laser light output from the laser light source so that when the decomposed beams are superposed and form the superposed beam of laser light having a predetermined shape and a uniform energy distribution, the generation of interference fringes in the energy intensity distribution of the laser light is avoided.
Dependencies are inferred from the claim text.