Constant-focus camera module
A camera module reinforced against excessive torque forces when being installed includes a lens bracket and a lens barrel. The lens bracket includes an internally-threaded receiving barrel, the lens bracket having external threads around its circumference. The external threads match the internal threads, and lower end of the lens bracket includes an annular groove, a resilient ring being received in the annular groove.
1. A camera module comprising:
a lens bracket and a lens barrel, the lens bracket comprising a receiving barrel, and a plurality of internal threads is formed on an inner surface of the receiving barrel; the lens barrel comprising a plurality of external threads around its circumference surface, and the external threads is matched with the internal threads, wherein a supporting portion is formed at a terminal of the internal threads, and the supporting portion is extended along a radial direction of the receiving barrel, and a first annular receiving groove is formed on the supporting portion and below the internal threads, and a lower end of the lens barrel comprises a second annular receiving groove, and a resilient ring is received in the second annular receiving groove.
2. The camera module of claim 1 , further comprising a printed circuit board and an image sensor, wherein the image sensor is mounted on the printed circuit board, and the lens bracket is fixed on the printed circuit board and covers the image sensor.
3. The camera module of claim 1 , wherein an outer diameter of the resilient ring in the second annular receiving groove is larger than diameters of the external threads, and the resilient ring is clamped between the second annular receiving groove and the internal threads.
4. The camera module of claim 2 , wherein the lens bracket further comprises a pedestal, the pedestal is substantially square and comprises a top surface, the receiving barrel comprises a circumference side wall protruding from the top surface and extending away from the top surface.
5. The camera module of claim 4 , wherein the pedestal comprises a hollow accommodation space, and the pedestal is fixed on the printed circuit board, and the hollow accommodation space covers the image sensor.
6. The camera module of claim 5 , wherein the supporting portion is formed at a junction of inside the hollow accommodation space and the receiving barrel, the supporting portion extends in a radial direction within the circumference side wall, and the supporting portion opens with a light through hole.
7. The camera module of claim 6 , wherein the supporting portion comprises a top end surface toward the internal threads, and the top end surface defines the first annular receiving groove.
8. The camera module of claim 7 , wherein the top end surface is formed with an annular flange surrounding the first annular receiving groove, a surface of the annular flange is formed with a layer of black adhesive.
9. The camera module of claim 8 , wherein the lens barrel comprises an optical lens portion and an assembly section locating at one end of the optical lens portion.
10. The camera module of claim 9 , wherein a bottom of the lens bracket comprises two fixing boards protruding away from a side surface of the pedestal, each of the two fixing boards comprises a mounting hole.
11. The camera module of claim 10 , wherein the printed circuit board comprises two fixing holes, each of the two fixing holes matches with a corresponding one of the two mounting holes, and a screw bolt is inserted into each of the two mounting holes and the corresponding one of the fixing holes to fix the lens bracket on the printed circuit board.
12. The camera module of claim 11 , wherein the camera module comprises a third annular receiving groove, the third annular receiving groove is formed by a top end of the circumference side wall and the assembly section.
13. The camera device of claim 12 , wherein a top end of the circumference side wall has no internal threads, and a thickness of the top end of the circumference side wall is thinner than a thickness of a bottom end, the internal threads are defined on the bottom end of the circumference side wall.
14. The camera module of claim 13 , wherein a sealing glue is disposed on the printed circuit board to seal a bottom periphery of the pedestal.
15. The camera module of claim 14 , wherein a connector is mounted on the printed circuit board and adjacent to the image sensor, and the connector is electrically connected to the image sensor.
16. The camera module of claim 1 , wherein an outer surface of the receiving barrel is an insert molding with a metal sheet, and the metal sheet circles and surrounds a periphery of the receiving barrel.
17. The camera module of claim 16 , wherein the metal sheet is located below the third annular receiving groove and corresponds to the inner thread of the outer surface.
18. The camera module of claim 1 , wherein a cross-section of the resilient ring is substantially round or square.