Lens module with protrusions on outer surface of barrel and camera module having same
An exemplary camera module includes a barrel, a holder, and an image sensor assembly. The barrel forms an external thread on an outer surface thereof. At least one protrusion is formed along a circumferential direction on the outer surface thereof. The at least one protrusion and the external thread are arranged in an order written from an object side to an image side. An internal thread is formed on an inner wall of the holder to threadedly engage with the external thread of the barrel. The at least one protrusion contacts the inner wall of the holder but are slidable relative to the inner wall of the holder. The image sensor assembly includes an image sensor. The image sensor is received in the holder.
1. A lens module comprising:
a barrel having an external thread formed on an outer cylindrical surface thereof, at least one protrusion formed on the outer cylindrical surface along a circumferential direction thereof, the at least one protrusion and the external thread arranged in an order written from an object side to an image side, wherein the at least one protrusion comprises a plurality of first protrusions and a plurality of second protrusions, and each second protrusion is formed on the respective first protrusion; and
a holder, an internal thread formed on an inner wall of the holder to threadedly engage with the external thread of the barrel, the at least one protrusion contacting the inner wall of the holder but being slidable relative to the inner wall of the holder.
2. The lens module of claim 1 , wherein the external thread and the at least one protrusion are spaced by a distance in an axis direction of the barrel.
3. The lens module of claim 1 , wherein a height relative to the outer cylindrical surface of each of the second protrusions plus the radius of the barrel equals the radius of the first through hole.
4. The lens module of claim 1 , wherein each of the second protrusions has a height relative to the outer cylindrical surface greater than a maximum height of the external thread relative to the outer cylindrical surface.
5. The lens module of claim 1 , wherein each first protrusion is larger than each second protrusion.
6. The lens module of claim 1 , wherein each second protrusion is formed on a lower end of each first protrusion adjacent to the holder.
7. The lens module of claim 1 , wherein each second protrusion is formed on a center of a side surface of each first protrusion.
8. The lens module of claim 1 , wherein the holder defines a first through hole, a second through hole, and a third through hole arranged in an order written from an object side to an image side therein, and the first through hole, the second through hole, and the third through hole comprise a first inner wall, a second inner wall, and a third inner wall thereof, respectively.
9. The lens module of claim 8 , wherein the first through hole, the second through hole, and the third through hole communicate with each other.
10. The lens module of claim 8 , wherein the second protrusions all contact the first inner wall of the holder but are slidable relative to the first inner wall of the holder.
11. The lens module of claim 8 , wherein the internal thread is formed on the second inner wall of the holder.
12. The lens module of claim 8 , wherein a flat step surface is formed between the second inner wall and the third inner wall, and the flat step surface is configured to block the barrel from moving forward in the holder.
13. A camera module comprising:
a barrel having an external thread formed on an outer cylindrical surface thereof, at least one protrusions formed on the outer cylindrical surface along a circumferential direction thereof, the at least one protrusion and the external thread arranged in an order written from an object side to an image side, wherein the at least one protrusion comprises a plurality of first protrusions and a plurality of second protrusions, and each second protrusion is formed on the respective first protrusion;
a holder, an internal thread formed on an inner wall thereof to threadedly engage with the external thread of the barrel, the at least one protrusion contacting the inner wall of the holder but being rotatably slidable relative to the inner wall of the holder; and
an image sensor assembly comprising an image sensor, the image sensor received in the holder.
14. The camera module of claim 13 , wherein the external thread and the at least one protrusion are spaced by a distance in an axis direction of the barrel.