Lens module and electronic device

Abstract

This application provides a lens module and an electronic device. A movable lens is disposed on a guide portion, and an internal thread surface that engages with an external thread is provided on the movable lens. The external thread is configured as a plurality of thread segments arranged along the axial direction of a screw, and the pitches of the plurality of thread segments are different. When the screw rotates, it can simultaneously drive the plurality of movable lenses to move along the optical path, and make their moving speeds different, thereby changing the distance between the movable lenses, thus realizing functions such as zooming or focusing, simplifying the internal structure of the lens module. Simultaneously, adjusting the pitch of the thread segments can change the moving speed and range of the movable lenses. When the first drive unit is not powered, the screw restricts the current position of the movable lens to reduce wear on the first drive unit.

Claims

1. A lens module, comprising: A department; A fixed lens is mounted on the base; a guide is mounted on one side of the fixed lens; a plurality of movable lenses are movably disposed on the guide, each of the plurality of movable lenses having an internal thread surface; and a first drive unit includes a screw with an external thread, the external thread comprising a plurality of thread segments along the length of the screw, the plurality of thread segments having different pitches and respectively engaging with the plurality of internal thread surfaces; the screw is configured to rotate to drive the plurality of movable lenses along the optical path toward or away from an imaging unit, wherein the plurality of thread segments includes a first thread segment and a second thread segment, the width of a tooth crest of the second thread segment being greater than that of the first thread segment, and the diameter of a tooth crest of the second thread segment being the same as that of the first thread segment.

2. The lens module as described in claim 1, wherein, The external thread is a trapezoidal thread and breaks at two adjacent thread segments.

3. The lens module as described in claim 1, wherein, The pitch of the first threaded segment is smaller than that of the second threaded segment, and the axial length of the first threaded segment is smaller than that of the second threaded segment; the plurality of movable lenses include a first lens corresponding to the first threaded segment and a second lens corresponding to the second threaded segment, the second lens being located between the first lens and the imaging unit.

4. As in request item 3, the lens module, wherein, Both the first lens and the second lens have a threaded groove located on the same side of the first lens and the second lens, and the internal thread surface is formed on the inner wall of the threaded groove; the screw passes through the two threaded grooves in sequence, and the side of the screw away from the movable lens is exposed on the outside of the threaded groove.

5. The lens module as described in claim 4, wherein, The first driving unit includes a magnetic plate; the lens module further includes: a base including a fixing frame, the fixing frame including two columns, the two ends of the screw being rotatably connected to the two columns, the magnetic plate being disposed on the fixing frame, and the magnetic plate and the screw being located on the same side of the movable lens; and a second driving unit including a first magnetic body disposed on the first lens and a second magnetic body disposed on the second lens, the second magnetic body and the first magnetic body being disposed on the side of the movable lens near the magnetic plate, and the magnetic force of the second magnetic body and the first magnetic body acting on the magnetic plate.

6. The lens module as described in claim 5, wherein, The guide section includes a first guide rod and a second guide rod; the first guide rod is fixedly connected to the two columns, and the movable lens is located between the first guide rod and the second guide rod; both the first lens and the second lens include a support portion and a lens barrel disposed on the support portion, the support portion having a first groove facing the first guide rod and a second groove facing the second guide rod; the screw drives the first lens and the second lens to move, and the first groove and the second groove slide along the first guide rod and the second guide rod respectively.

7. The lens module as described in claim 6, wherein, The base includes a base plate, on which two columns are erected; the first slide groove is a V-shaped groove with two mutually perpendicular first contact planes, which extend along the axial direction of the first guide rod and abut against the first guide rod; the second slide groove has a second contact plane, which extends along the axial direction of the second guide rod and abuts against the second guide rod, and the second contact plane faces the base plate at an angle of 45 degrees to both of the two first contact planes.

8. The lens module as described in claim 3, wherein, The first lens is located between the second lens and the fixed lens, and the screw drives the first lens and the second lens to move closer to or further away from the fixed lens.

9. The lens module as described in claim 5, wherein, The first drive unit also includes a worm, a turbine, and a drive motor mounted on the fixed frame. One end of the worm passes through the column and is connected to the turbine. The worm is fixedly connected to the output shaft of the drive motor and meshes with the turbine.

10. The lens module as described in claim 6, wherein, The second lens's support portion includes a first support body and a second support body. The first support body has the first groove and the second groove. The lens barrel is disposed on the second support body, and the second support body is movably disposed on the first support body. The number of second magnetic bodies is multiple. The second driving part also includes a first coil disposed at intervals from the multiple second magnetic bodies. One of the second magnetic bodies and the first coil is disposed on the first support body, and the other is disposed on the second support body. The multiple second magnetic bodies are arranged along the length direction of the first guide rod, and the magnetic poles of two adjacent second magnetic bodies face opposite directions. The induced magnetic field of the first coil acts on the multiple second magnetic bodies to drive the lens barrel closer to or away from the imaging part through the second support body.

11. The lens module as described in claim 10, wherein, The first carrier is provided with two third slides facing different directions, and the second carrier is provided with two fourth slides facing the two third slides respectively; the second lens also includes a plurality of balls, which are disposed between the third slides and the fourth slides, and the third slides move relative to the fourth slides through the balls.

12. The lens module as described in claim 10, wherein, The second lens also includes: a flexible transmission line disposed on the second lens and bent toward the first lens, the flexible transmission line including a first end and a second end, the first end being fixedly connected to the imaging unit, and the second end being fixedly connected to the first carrier.

13. The lens module as claimed in any one of claims 4 to 12, wherein, The lens module also includes a constraint part disposed on the first lens and the second lens; the constraint part is configured such that when the movable lens is in a stationary state, the constraint part generates a constraint force to drive the two threaded segments to abut against the two internal threaded surfaces respectively.

14. An electronic device comprising: The lens module as described in any one of claims 1 to 14.

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