Page 23 of 39 RTE6701-OEM Integration Manual VC27U V1.03 DRAFT.doc
8 Guide Arrangement
The general assembly is shown in Figure 4 – this should only be used as an
example of a simple single entry guide. 3M can either provide the mechanical
arrangement shown or will help OEMs design their own slot for inclusion within
their own equipment. The dimensions and mounting for the read head is shown in
Appendix D – Read Head Dimensions and Mounting Points.
When designing the guide, there are some technical conditions that you must stick to:-
Failure to comply with these requirements will mean that your design will not be
able to read a wide range of real life documents and will fail to meet ICAO reading
standards.
1.
The slot past the read head should be no wider than 2 mm.
2.
There should be adequate provision for the entry to the guide (either top drop or side swipe) and generally
a wider entry will make it easier for the user to enter the document into the guide.
3.
Consider whether you require bi-directional swiping.
4.
Generally a vertical guide is best as this lets gravity help pull the document to the bottom of the guide.
Angling the guide at roughly 30 degrees front to back (back higher) with a back to front swipe is
ergonomically best.
5.
The back of the slot opposite the read head should be non-reflective in the near infra red band. This must
be checked using an IR detector, do not assume that black finished are absorbent in the infra-red region.
6.
The glass must be 5mm thick. The window must be full length of the read head.
7.
The glass must be made from an optically pure good quality product with approximately 90% transmission
across 5 mm at 900nm. 3M uses Pilkington's Optiwhite (code FG2) although there are similar products
from other manufacturers. 3M RT can provide the detailed specification for this glass if required.
Transmissive glass surfaces must be smooth and free of inclusions, scratches or blemishes. 3M
recommends that the other surfaces have a diffuse ground finish.
8.
The read head must be tight against the glass.
9.
The document must be able to pass smoothly in the required direction(s) past the read head without
catching on the guide.
3M provides a custom design and / or manufacture service for any of the above
components. Contact your local 3M Sales Representative for more details.
To Next Page
Loading...