Cognex In-Sight 1721, User Manual

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Section 3: Configuring a Wafer ID Application In-Sight
®
1700 Series Wafer Reader
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3.5.9 Image Orientation
The Image Orientation setting selects the orientation of the wafer mark in the image. The
default orientation is Normal.
SELECTION DESCRIPTION
Normal (default) Unmodified image acquired by the wafer reader.
Mirrored horizontally Horizontally mirrors the acquired image.
Flipped vertically Vertically flips the acquired image.
Rotated 180 degrees Rotates the acquired image by 180 degrees.
3.5.10 Light Mode and Light Power
Each Config can have unique Light Mode and Light Power settings for optimizing the
readability of the wafer mark in the image. In-Sight will automatically determine the
optimal light settings for a mark during the tuning process if the Light checkbox in the
Tune dialog is enabled.
Light Mode
The Light Mode setting specifies either a Bright Field or a Dark Field illumination effect on
the mark. Each position on the Light Mode slider control enables specific groups of LEDs
to achieve the intended effect in the image.
SELECTION DESCRIPTION
Slider position 0 All lights are disabled. Use this mode only when an external light source is required in a
specialized application.
Slider positions 1-3
(BF1–BF3) The mark will appear dark on a light background.
Default = BF1
Slider positions 4-12
(DF1–DF8) The mark will appear light on a dark background.
Light Power
The Light Power setting controls the effective intensity of the LEDs on the mark by
increasing the exposure time of the wafer reader’s CCD imager, in increments of 0.167
milliseconds. Decrease Light Power for a darker image; increase it for a lighter image.
Generally, use Light Power to maximize the contrast of the mark relative to the
background on the wafer.
NOTE The effect of the Light Power setting is visible in the duration of the “strobed” light pulse as the
wafer reader acquires an image.