Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-01-26
1990-04-17
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358225, 358901, H04N 718
Patent
active
049185179
ABSTRACT:
The invention is both a system and method for video monitoring a metal working process which involves the generation of an intense point source of light near or on a workpiece, such as an electric arc welding process. The system comprises a lens assembly for projecting an image of the point source of light and the area of the workpiece being worked onto the image sensing circuit of a television camera, a filter assembly having at least one filter element that includes both a central region of low light transmission for dimming the image of the point source of light projected onto the image sensing circuit, and a peripheral region of high light transmission for freely transmitting the image of the background surrounding the point source, and a mechanism for adjusting the apparent size of the central region of low light transmission relative to the image. In the preferred embodiment, an iris disposed within the lens assembly is used to adjust the apparent size of the central region so that it just barely covers the bright arc generated by the torch assembly so that the weld puddle and surrounding area of the workpiece is clearly visible and brightly illuminated in the resulting video image. The system provides a clear, bright and well balanced image of a welding operation without the severe and obscuring contrasts associated with prior art monitoring devices.
REFERENCES:
patent: 4039254 (1977-08-01), Harsch
patent: 4240709 (1980-12-01), Hornell
patent: 4251141 (1981-02-01), Stemme et al.
patent: 4348578 (1982-09-01), Masaki
patent: 4591253 (1986-05-01), Hecker et al.
patent: 4639772 (1987-01-01), Sluyter
patent: 4649426 (1987-03-01), Bolstad
patent: 4728173 (1988-03-01), Toth
patent: 4730096 (1988-03-01), Mizumoto
Britton Howard W.
Westinghouse Electric Corp.
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