Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1995-11-09
1997-09-23
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
25055913, 21912178, G02B 704
Patent
active
056707738
ABSTRACT:
In order to localize in space a focal point of a laser beam (14) of a machining machine with respect to a work table (18) thereof, the table is fixed an equipment (22) comprising a square target (20) and impact detectors such as illumination or light sensors. In a first plane (YOZ) perpendicular to the target plane localization takes place of the impact points of the beam with the edges of the target perpendicular to the first plane, by placing an estimated focal point (PFE) at a given distance d above and below the target. Thus, determination takes place of a first calculated value (PFC1) of the focal point. This operation is repeated at least once in the plane (YOZ) and then the same operations are performed in another plane (XOZ) in order to obtain a precise and reproducible space localization of the focal point.
REFERENCES:
patent: 3891857 (1975-06-01), Wiklund
patent: 4037958 (1977-07-01), Schmidt et al.
patent: 4363962 (1982-12-01), Shida
patent: 4761561 (1988-08-01), Fujiwara et al.
patent: 4939377 (1990-07-01), Okuda et al.
patent: 5521374 (1996-05-01), Cray et al.
Aerospatiale - Societe Nationale Industrielle
Meller Michael N.
Pyo Kevin
Westin Edward P.
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