Membrane switch keypads graphic overlay Display Windows

Membrane switch keypads graphic overlay Display Windows including Clear and Transparent Colors:
A fixture to simulate the finished product is used to inspect membrane keypads display windows.
Clear and transparent colors are viewed through the fixture with an illumination set to approximate the finished product membrane keyboard.
For windows under 12 square inches of total area, each part is viewed for two seconds for every three square inches of display.
For windows over 12 square inches of total area, each part is viewed for eight seconds plus and an additional second for every three square inches over 12.
No visible flaws, including pinholes or color variation are acceptable.
Graphic overlay Color Inspection Criteria:
Colors are specified by a color matching system or customer supplied color swatch. Printed colors must be within 1.0 E (Delta E) of the specified color when measured on a photo spectrometer.
To visually compare colors, the finished printed part is placed next to the specified color swatch. A neutral gray template with two 0.375” diameter holes is placed over both parts. Position the template with one hole over the printed part and the other over the swatch. For a perfect match, there should be no color variation.
The light source should be a standard cool white fluorescent lamp emitting 75 to 100 foot candles.
For graphic overlay backlit areas and windows, colors should be compared over a fixture to simulate the illumination of the finished part as installed in the field.
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