HID Lumidigm M Series, Руководство по механической интеграции

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Lumidigm M-Series M3xx Modules Mechanical Integration Guide, PLT-02217, Rev. A.0
Page 7 of 28 December 2014
or enforce stable placement so that once a finger is placed, subsequent movement is
minimized for about 150ms.
• The actual opening in the ergonomic feature that is in contact with the M3xx sensor
head should remain rectangular to provide a reliable sealing surface between the
ergonomic and the sensor head. The sealing surface is shown in the upper right of
Figure 7 and the dimensions of the sealing area are shown in the upper left portion of
Figure 7.
• The ergonomic feature shown in Figure 2 consists of an elliptical opening designed to
encourage finger placement such that the core of the fingertip is centered on the
platen area. In the Figure, the finger approaches from the left and the higher wall on
the right (sensor back) side is meant to stop additional forward motion, while the
lower entry wall is meant to insure full finger contact with the sensor platen area. And
finally the rectangular sealing surface aligns to the M3xx sensor head sealing area. If
an IP65-rated enclosure is required, an additional gasket would be added between
the M3xx sensor head and the enclosure ergonomic feature shown.
•
Care must be taken to place the M3xx sensor head in the enclosure such that the
platen surface is as close as possible to the enclosure’s external surface. A deep
depression at this interface may collect water and other contaminants and impede
finger contact with the platen. If the enclosure will be exposed to rain, enclosure
features that passively drain the platen surface should be considered.
• The final human factor design consideration is environmental. Solar heat gain at the
platen surface can increase platen temperature to levels to that uncomfortable to
touch. The sensor platen surface should be shaded by the enclosure from direct
sunlight through a combination of enclosure features as well as the placement of the
enclosure itself in the environment.
Lumidigm has experience designing ergonomic features that promote high biometric
system performance and should be consulted for this portion of the enclosure design.