| 摘要 |
<p>A background medium for an optical sorting machine that sorts products in a passing product strewn by detecting variations in colour or hue against the background, is a clear cylindrical or flat material(51) located in the centre of the optical viewing assembly of the machine and having a background area(53) painted or projected thereon. The background is preferably on the outside surface of the tubular material aligned opposite the product stream from the detector(44,46) of the light that is reflected from a fight source off the products in the stream. Alternatively, the background area is textured, such as being frosted to cause a diffusion effect, and a background colour is projected as a background image onto the textured area. A machine that uses a bichromatic sorting background is similarly improved for a background colour or hue established in two sorting frequency spectrums. Multiple backgrounds can also be employed on a single tubular material for the respective optical sorting detectors that are employed to view the product stream at various different angles. <IMAGE></p> |
