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HSDL-3602 Datasheet(PDF) 25 Page - Lite-On Technology Corporation |
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HSDL-3602 Datasheet(HTML) 25 Page - Lite-On Technology Corporation |
25 / 27 page 25 To ensure IrDA compliance, some constraints on the height and width of the window exist. The minimum dimensions ensure that the IrDA cone angles are met without vignetting. The maximum dimensions mini- mize the effects of stray light. The minimum size cor- responds to a cone angle of 300 and the maximum size corresponds to a cone angle of 60º. In the figure below, X is the width of the window, Y is the height of the window and Z is the distance from the HSDL-3602 to the back of the window. The distance from the center of the LED lens to the center of the photodiode lens, K, is 7.08mm. The equations for com- puting the window dimensions are as follows: X = K + 2*(Z+D)*tanA Y = 2*(Z+D)*tanA The above equations assume that the thickness of the window is negligible compared to the distance of the module from the back of the window (Z). If they are comparable, Z' replaces Z in the above equation. Z' is defined as Z'=Z+t/n where ‘t’ is the thickness of the window and ‘n’ is the re- fractive index of the window material. Appendix D: Optical Port Dimensions for HSDL-3602: Section of a castellation in Y-axis. D Z K A IR TRANSPARENT WINDOW OPAQUE MATERIAL OPAQUE MATERIAL IR TRANSPARENT WINDOW HSDL-3602 Optical Port Dimensions X |
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