R200 datasheet(29/51 Pages) INTEL

29 / 51 page

System Integration

334616-001

7.8

Rear Cover Design Guidance

In addition to any thermal heat spreaders, the rear cover design must take into

consideration the openings for the R200 camera, projector, and LED. The openings

should be designed so that they provide protection from dirt and damage but also

accommodate the following considerations.

•

Maximize effective field of view of the cameras and field of projection of the

projector

•

Minimize air gap distance between the bezel surface and the front of the imaging

module components. This is done to minimize the size of the holes in the rear cover

required.

•

Employ gasket material and separate cover material windows to isolate the IR laser

projector output and prevent reflections off the cover material back into the system

chassis.

The R200 computer aided design model (part of mechanical design package) includes

the lens field of view projection profiles for each component. It is recommended to use

the model along with a platform chassis model to minimize the cover hole diameters.

7.8.1

Transparent Cover Material

It is recommended to use a transparent cover material over in the rear cover holes to

protect the camera module and prevent dirt from entering the system chassis. For the

IR projector and IR cameras, the material must have a 98% or higher transmission

rate in the 854 nm to 864 nm range. Anti-reflective coatings can help increase the IR

transmission of transparent material. Most designs will require an AR coating on both

sides of the cover material to reach 98% IR light transmission, using material with

lower than 98% transmission can result in poor depth performance. Because the

camera performance is limited by IR light from the projector indoors, a transparent

cover material that reduces IR light transmission will decrease the working range of

the camera.

R200 Datasheet(PDF) 29 Page - Intel Corporation