Electric heating – Metal heating – By arc
Reexamination Certificate
2005-08-16
2005-08-16
Heinrich, Samuel M. (Department: 1725)
Electric heating
Metal heating
By arc
C219S121670, C219S121700, C219S121730
Reexamination Certificate
active
06930274
ABSTRACT:
Preferred embodiments of a system and methods to deliver different magnitudes of laser power density to a work piece while maintaining a constant focusing spot size are described. In particular, the system includes a laser, an optical focusing assembly and an overlay. The overlay receives a laser beam having a perimeter at a first magnitude of power and transmits the laser beam to the optical focusing assembly at about the same perimeter and at a magnitude lower than the first magnitude. In a preferred embodiment, the overlay can include an optically neutral blocking lens or a neutral density filter. A method of laser machining an orifice at a suitable average power density sufficient to machine the orifice with reduced heat affected zone, spatters, soots or recasts is described. A method of providing a focusing spot size of a generally constant effective area by a laser machining system is also described.
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Heinrich Samuel M.
Siemens VDO Automotive Corporation
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