Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1980-04-07
1982-11-02
Rosenberger, R. A.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250572, 356431, G01N 2186
Patent
active
043570712
ABSTRACT:
Optical fault seeking apparatus for material webs uses an optical scanning device to scan the material webs point by point line by line. The optical scanning device consists of a laser light source (17) which projects a light beam via a micro-objective (19), a cylindrical lens (20), and a further objective onto a mirror wheel arrangement (14) which is located substantially at the focus of a strip-like concave mirror (23). A light beam (24) is produced in the image space of the strip-like concave mirror (23) and generates a scanning light bead in a scanning plane through which the material web passes. The mirror wheel arrangement (14) has at least first and second alternately operating types of mirror surfaces which serve to alternately project light beads of different size and/or shape onto the material web thus enabling different types of fault to be reliably detected. The different types of scanning light bead are produced either by different curvatures of the faces (15) and (17) of the mirror wheel arrangement (14) or by the use of other optical means alone or in combination with differently shaped faces of the mirror wheel. Certain embodiments operate using two mirror wheels in tandem.
REFERENCES:
patent: 3488102 (1970-01-01), Buck et al.
patent: 4005926 (1977-02-01), Neale et al.
patent: 4116566 (1978-09-01), Sick
patent: 4123134 (1978-10-01), Meyers
patent: 4265545 (1981-05-01), Slaker
patent: 4277178 (1981-07-01), Cushing et al.
Mankel Siegfried
Ostertag Klaus
Schreyer Heinz
Erwin Sick GmbH, Optik-Elektronic
Rosenberger R. A.
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