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ISL29001IROZ-T7 Fiches technique(PDF) 9 Page - Intersil Corporation |
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ISL29001IROZ-T7 Fiches technique(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN6166.5 February 8, 2007 n = 1.85. This is a fudge factor to scale back the sensitivity up to ensure Equation 4 is valid. k = 7.5. This is a scaling factor for the IR sensitive Diode 2. Flat Window Lens Design A window lens will surely limit the viewing angle of the ISL29001. The window lens should be placed directly on top of the ISL29001. The thickness of the lens should be kept at minimum to minimize loss of power due to reflection and also to minimize loss of loss due to absorption of energy in the plastic material. A thickness of t = 1mm is recommended for a window lens design. The bigger the diameter of the window lens the wider the viewing angle is of the ISL29001. Table 4 shows the recommended dimensions of the optical window to ensure both 35° and 45° viewing angle. These dimensions are based on a window lens thickness of 1.0mm and a refractive index of 1.59. Window with Light Guide Design If a smaller window is desired while maintaining a wide effective viewing angle of the ISL29001, a cylindrical piece of transparent plastic is needed to trap the light and then focus and guide the light on to the ISL29001. Hence the name light guide or also known as light pipe. The pipe should be placed directly on top of the ISL29001 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 13. DLENS ∅ t D1 DTOTAL ∅ = Viewing angle WINDOW LENS ISL29001 FIGURE 12. FLAT WINDOW LENS TABLE 4. 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 ISL29001 D2 D2 > 1.5mm FIGURE 13. WINDOW WITH LIGHT GUIDE/PIPE ISL29001 |
Numéro de pièce similaire - ISL29001IROZ-T7 |
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Description similaire - ISL29001IROZ-T7 |
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