Method and apparatus for calibrating and improving linearity of system for scanning moving objects
US5170279A · kind A · utility
Inventors
Key dates
| Filing date | Nov 1, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Nov 1, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
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 a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.