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Table 2-2
Minimum Angle (Tilted Window)
Uncoated, minimum window positive tilt (+w)
Uncoated, minimum window negative tilt (-w)
Anti-reflection coated, single side, minimum window positive tilt (+w)
Anti-reflection coated, single side, minimum window negative tilt (-w)
Anti-reflection coated, double sides, minimum window positive tilt (+w)
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.
9
Distance from the front of the engine housing (b)
5mm
10mm
30°
25°
25°
22°
22°
20°
15mm
20mm
22°
18°
20°
16°
18°
15°
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