Festo SBO***-Q Series, Руководство пользователя

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1. System overview
1-19
Festo P.BE-SBO-Q-EN en 1602e
To recognise different characteristics or check parts, you
should switch between various light sources, if necessary.
Use the following light sources or lighting techniques:
Light source Properties Recognition of
Back light Shines on the check part from the
opposite side. The light shining
through or around the check part
shows the shape of the check part. – Contours of (transparent) check
parts
– Levels of colourless liquids in
transparent vessels
Dome light Throws an indirect light from various
directions onto the check part and
generates a soft, diffuse and even
light. Check parts with irregular
shapes or curved surfaces are
illuminated evenly. Glare is avoided. – Printing on aluminium packaging
– Coating errors or holes on check
parts with crooked surface
– Stains on uneven or crooked
surfaces
Rod light Generates even, direct light on long
check parts. The diagonally impacting
light generates diffuse reflection,
which permits easy differentiation. For
shiny surfaces, a polarisation filter is
recommended. – Faulty galvanisation of contacts
– Edges of thin, transparent check
parts
Flat angle light Throws a direct light at a flat angle on
the edges of the check part (diagonal
lighting of the surface edges). This
clearly emphasises deviations at the
edges of the check part, and any
surface faults. – Chipping on low-contrast surfaces
and edges
– Thickness deviations and surface
faults
Coaxial vertical
light Lights the check part in the same axis
on which the lens is located.
Reflecting light from shiny surfaces is
reinforced, dark diffuse light is
dispersed. This increases the contrast
between dark and light surfaces. – Embossings/stampings
– Indentations on press-shaped
pieces
– Defects on the floor of deep-drawn
pieces
Tab. 1/7: Light sources