Method and apparatus for calibrating and improving linearity of

Details Method and apparatus for calibrating and improving linearity of Method and apparatus for calibrating and improving linearity of

1991-11-01

1992-12-08

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

356385, 359900, G02B 2608

Patent

active

051702797

ABSTRACT:
A method for calibrating and improving linearity of a system for scanning moving objects. A type of scanning system and a set of parameters to define the scanning system are selected. A set of initial values for some of the parameters are also selected and mathematical equations are derived which describe physical movements of the scanning and relationships between the parameters. The equations are solved to find values for the parameters with which the objects are scanned by an incident light with linearity and a predetermined accuracy. The parameters of the scanning system are then set to the values obtained by solving the equations. The system itself consists of a rotating polygon (34) and a rotating carousel (42) having predetermined axes of their rotation. The polygon (34) has a plurality of facets (46) which are symmetric with respect to the polygon's axis of rotation. The carousel supports objects, such as bottles (36, 37, . . . 41) which also may have spinning motions. The system may operate in a reading mode when objects are illuminated by an incident light beam which is reflected and is directed to a processing unit, or in a writing mode when the surfaces of the objects are treated, e.g., by a laser beam for engraving marks while the objects are moved by the carousel (42) and spin around their own axes.

REFERENCES:
patent: 3602571 (1971-08-01), Noris, Jr.
patent: 4632503 (1986-12-01), Karlsson

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