Patent ID: 8354611
Filing Date: 2013-01-15
Classification: B23K

Abstract:
1. A method for engraving a reproduction of an original gray-scale image on a substrate, the gray scale image comprising a plurality of pixels each thereof having a pixel dimension and a gray-scale value, the method comprising the steps of: mounting the substrate on a turntable having a rotation axis; rotating the turntable about the rotation axis; focusing a modulatable laser beam into a focal spot on the substrate; and rotating the turntable and the substrate thereon, translating the focal spot of the laser beam across the substrate in a direction transverse to the rotation direction, and modulating the laser beam such that the replica of the gray-scale image is engraved on the substrate with each pixel of the original image being reproduced as a plurality of about parallel lines having a length in the rotation direction and a spacing therebetween in the translation direction selected to represent the gray-scale value of that pixel.