| 摘要 |
A lens module includes a holder, a barrel, a lens, and a focus ring. The barrel is accommodated in the holder and threadedly coupled to the holder. The lens is received in the barrel. The focus ring surrounds and is securely fixed with the barrel. The focus ring is sandwiched between the holder and the barrel. The focus ring has at least two protrusions formed on an outer surface thereof. The at least two protrusions are symmetrical about a center of the focus ring.
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