Electron beam apparatus

Details Electron beam apparatus Electron beam apparatus

1975-08-19

1977-08-16

Truhe, J. V.

Electric heating

Metal heating

By arc

B23K 900

Patent

active

040428010

ABSTRACT:
In order to provide exceptionally high beam deflection speed in apparatus utilizing a magnetically deflected electron beam, such as an electron microscope or an electron beam welding machine, a ferro-magnetic yoke having opposed internal poles arranged to be positioned on opposite sides of the beam is provided with a pair of beam deflection coils on each pole, one coil of each pair being connected in a series circuit including a coil of the other pair and in a sense such that the voltage induced in one pair of coils by a collapsing deflection current in the other pair assists the rising deflection current in the first mentioned pair.
In the case of a welding machine the apparatus includes generating means for applying to each series circuit alternately a voltage having a waveform such that the beam may be deflected alternately between two welding positions spaced transversely relative to the direction of movement of the workpiece and at a speed such that there is no substantial melting of the workpiece during the transverse movement of the beam.

REFERENCES:
patent: 2882446 (1959-04-01), Janssen et al.
patent: 3131289 (1964-04-01), Hansen
patent: 3169207 (1965-02-01), Obert et al.
patent: 3221133 (1965-11-01), Kazato et al.
patent: 3389252 (1968-06-01), Poole
patent: 3479483 (1969-11-01), Boring et al.
patent: 3854108 (1974-12-01), Horie et al.

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