Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2006-02-28
2008-03-18
Lee, Seung Ho (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S436000, C235S439000, C235S491000
Reexamination Certificate
active
07344076
ABSTRACT:
There is disclosed a laser processing device, comprising: a laser light source for emitting laser light; an irradiating optical system for irradiating laser light emitted from the laser light source substantially perpendicularly onto a processing surface of an object to be processed; a reflected light monitoring unit for monitoring the intensity of light reflected from the processing surface which is being irradiated with the laser light from the irradiating optical system; a thermal radiation monitoring unit for monitoring the intensity of thermal radiation generated at the processing surface which is being irradiated with the laser light from the irradiating optical system; and a controller for controlling output of laser light from the laser light source, wherein the controller determines abnormality and either one of reduces and stops output of laser light from the laser light source when the intensity of reflected light monitored by the reflected light monitoring unit drops below a first prescribed value during irradiation by the laser and the output of laser light from the laser light source is in a prescribed state and either one of prior to the start and after the end of thermal radiation.
REFERENCES:
patent: 6808117 (2004-10-01), Han et al.
patent: 7255275 (2007-08-01), Gurevich et al.
patent: 2004-322146 (2004-11-01), None
Yousuke Kawhito, et al., “In-Process monitoring and adaptive control in laser micro-spot lap welding of aluminum alloy,” Proceedings of the 62nd Laser Materials Processing Conference, Dec. 2004, pp. 136-142.
Ho Lee Seung
Sumitomo Electric Industries Ltd.
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