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ISL29003IROZ-T7 Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL29003IROZ-T7 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN7464.2 December 12, 2006 Window with Light Guide Design If a smaller window is desired while maintaining a wide effective viewing angle of the ISL29003, a cylindrical piece of transparent plastic is needed to trap the light and then focus and guide the light on to the device. Hence the name light guide or also known as light pipe. The pipe should be placed directly on top of the device with a distance of D1 = 0.5mm to achieve peak performance. The light pipe should have minimum of 1.5mm in diameter to ensure that whole area of the sensor will be exposed. See Figure 5. TABLE 16. RECOMMENDED DIMENSIONS FOR A FLAT WINDOW DESIGN DTOTAL D1 DLENS @ 35 VIEWING ANGLE DLENS @ 45 VIEWING ANGLE 1.5 0.50 2.25 3.75 2.0 1.00 3.00 4.75 2.5 1.50 3.75 5.75 3.0 2.00 4.30 6.75 3.5 2.50 5.00 7.75 t = 1 Thickness of lens D1 Distance between ISL29001 and inner edge of lens DLENS Diameter of lens DTOTAL Distance constraint between the ISL29001 and lens outer edge * All dimensions are in mm. DLENS t L DLENS LIGHT PIPE ISL29003 D2 D2 > 1.5mm FIGURE 5. WINDOW WITH LIGHT GUIDE/PIPE ISL29003 |
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