Laser marking system

Abstract

A laser energy microinscribing system, comprising a semiconductor excited Q-switched solid state laser energy source; a cut gemstone mounting system, allowing optical access to a mounted workpiece; an optical system for focusing laser energy from the laser energy source onto a cut gemstone; a displaceable stage for moving said gemstone mounting system with respect to said optical system so that said focused laser energy is presented to desired positions on said gemstone, having a control input; an imaging system for viewing the gemstone from a plurality of vantage points; and a rigid frame supporting said laser, said optical system and said stage in fixed relation, to resist differential movements of said laser, said optical system and said stage and increase immunity to vibrational misalignments. The laser energy source is preferably a semiconductor diode excited Q-switched Nd:YLF laser with a harmonic converter having an output of about 530 nm. The system may further comprise an input for receiving marking instructions; a processor for controlling said displaceable stage based on said marking instructions and said imaging system, to selectively generate a marking based on said instructions and a predetermined program; and a storage system for electronically storing information relating to images of a plurality of workpieces. A secure certificate of authenticity of a marked workpiece is also provided.

Description

FIELD OF THE INVENTION [0001] The present invention relates to the field of inscribing indicia on a surface of gemstones, and more particularly to a system employing a Q-switched pulse laser for forming markings on a portion of a gemstone. BACKGROUND OF THE INVENTION [0002] A known system, as described in U.S. Pat. No. 4,392,476, incorporated herein by reference, for inscribing diamonds includes a Nd:YAG (1.06 μm, frequency doubted) Q-switched laser which marks diamonds by graphitizing the surface at a laser focal point. The beam position is computer controlled to create overlapping treated regions. The accuracy of known embodiments of this system are limited by vibration and laser steering system accuracy. [0003] U.S. Pat. No. 4,667,172, incorporated herein by reference, describes a laser beam diamond inscribing system, which provides a Q-switched flashlamp pumped YAG laser (1.06 μm, frequency doubled) with the diamond mounted on a computer-controlled positioning table for inscribi...

AI Technical Summary

Benefits of technology

"The invention is a laser energy microinscribing system that can create precise marks on a workpiece using a focused laser beam. The system includes a pulse laser energy source, a workpiece mounting system, an optical system for focusing the laser energy, a control input for directing the focused laser energy onto the workpiece, an imaging system for viewing the workpiece from multiple angles, and a processor for controlling the laser energy directed onto the workpiece. The system can also include a storage system for electronically storing information about the marks on the workpiece. Additionally, the invention includes a semiconductor excited Q-switched solid state laser energy source, a cut gemstone mounting system, and a displaceable stage for moving the gemstone mounting system to different positions for laser engagement. The system is designed to increase accuracy and immune to vibrational misalignments."

Problems solved by technology

The accuracy of known embodiments of this system are limited by vibration and laser steering system accuracy.

Thus, repositioning to form complete characters or graphics is unnecessary.

Images