Electric heating – Metal heating – By arc
Patent
1992-11-12
1994-08-02
Albritton, C. L.
Electric heating
Metal heating
By arc
21912175, 21912182, 21912184, B23K 2602
Patent
active
053348168
ABSTRACT:
In the laser beam machining apparatus, an optical sensor provided with a blue filter detects change of color of light emission from the machining spot on a workpiece irradiated by a machining laser beam from orange color light emission to blue color light emission, when laser beam intensity per area becomes above a certain level as a result of good focusing by a condenser lens; and the position of the condenser lens is controlled based on output of the optical sensor, in a manner that the optical lens lies in such a positional range that the blue color is emitted from machining spot.
REFERENCES:
patent: 4689467 (1987-08-01), Inoue
patent: 4764655 (1988-08-01), Ortiz, Jr. et al.
patent: 5045668 (1991-09-01), Neiheisel et al.
patent: 5061839 (1991-10-01), Matsuno et al.
patent: 5118918 (1992-06-01), Serrano
English Abstract of Inoue Japanese laid open appln. No. 58-183403, Sep. 1983.
Albritton C. L.
Matsushita Electric - Industrial Co., Ltd.
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