12
Table 2-2
Minimum Angle (Tilted Window)
Distance from the front of the engine housing (b)
5mm
10mm
15mm
20mm
Uncoated, minimum window positive tilt (+w)
25
°
20
°
18
°
16
°
Uncoated, minimum window negative tilt (-w)
Anti-reflection coated, single side, minimum window positive tilt (+w)
22
°
18
°
16
°
16
°
Anti-reflection coated, single side, minimum window negative tilt (-w)
Anti-reflection coated, double sides, minimum window positive tilt (+w)
20
°
17
°
15
°
15
°
Anti-reflection coated, double sides, minimum window negative tilt (-w)
Window Material and Color
Window material must be clear. Use only cell-cast plastics or optical glass. PMMA, ADC and chemically tempered glass are
recommended. Window material selected for the engine should meet or exceed the specifications specified in
Table 2-3
.
•
PMMA (Cell-cast acrylic):
When fabricated by cell-casting, has very good optical quality and low initial cost, but surface
must be protected from the environment due to its susceptibility to attack by chemcials, mechanical stresses, and UV
light. Reasonably good impact resistance. This material can be laser-cut into odd shapes and ultrasonically welded.
•
ADC (CR-39):
A thermal-setting plastic produced by the cell-casting process. Excellent chemical and environmental
resistance. Quite good surface hardness, and therefore does not have to be hard-coated. Reasonably good impact
resistance. This material cannot be ultrasonically welded.
•
Chemically tempered glass:
Glass is a hard material which provides excellent scratch and abrasion resistance. But
unannealed glass is brittle. Increased flexibility strength with minimal optical distortion requires chemical tempering.
Glass is hard to be cut into odd shapes and cannot be ultrasonically welded.
Table 2-3
Specification
Description
Spectral Transmittance
≥
90%
Thickness
0.8-2.0mm
Wavefront Distortion
PV maximum: 0.2λ
RMS maximum: 0.04λ
Clear Aperture
1.0mm to edges
Surface Quality
60-20 scratch/dig
Содержание NLS-EM2037 V4
Страница 1: ...NLS EM2037 V4 OEM Scan Engine Integration Guide...
Страница 4: ......
Страница 13: ...7 Mechanical Mounting Dimensions for the All in one Type Unit mm Front View Figure 2 2 Bottom View Figure 2 3...
Страница 14: ...8 Side View Figure 2 4 Mechanical Mounting Dimensions for the Imager Unit mm Front View Figure 2 5...
Страница 15: ...9 Top View Figure 2 6 Bottom View Figure 2 7 Side View Figure 2 8...
Страница 20: ...14 SR version Horizontal Vertical Figure 2 13...
Страница 21: ...15 HD version Horizontal Vertical Figure 2 14...
