| 摘要 |
A lens module includes a holder base, which is affixed to a circuit board and has bottom receiving holes for receiving LEDs or sensors on the circuit board and a top flange with a foolproof notch, a lens device press-fitted into the top flange and secured to the foolproof notch to ensure accurate positioning and having flat protrusions engaged into respective through holes in the holder base in alignment with the LEDs or sensors, and a top cover capped on the holder base to hold down the lens device and having through holes that receive convex portions of the lens device respectively.
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