Lens device

Abstract

A lens device including a lens barrel, a lens, a linear reciprocating motion mechanism, and a power machine is provided. The lens is disposed in the lens barrel. The linear reciprocating motion mechanism includes a first movable part and a second movable part. The first movable part is coupled to the lens barrel. The second movable part is coupled to the first movable part. The power machine is coupled to the second movable part to drive the second movable part to rotate, thereby driving the first movable part, and the first movable part drives the lens barrel to perform a linear reciprocating motion, wherein when the second movable part is rotated by N turns, the first movable part is rotated by one turn, and N is greater than or equal to 10.

What is claimed is: 
     
         1 . A lens device, comprising:
 a lens barrel;   a lens disposed in the lens barrel;   a linear reciprocating motion mechanism, comprising:
 a first movable part coupled to the lens barrel; and 
 a second movable part coupled to the first movable part; and 
   a power machine coupled to the second movable part to drive the second movable part to rotate, thereby driving the first movable part, and the first movable part drives the lens barrel to perform a linear reciprocating motion, wherein when the second movable part is rotated by N turns, the first movable part is rotated by one turn, and N is greater than or equal to 10.   
     
     
         2 . The lens device according to  claim 1 , wherein the first movable part comprises a first rotating part and a second rotating part, a center of the first rotating part is coaxial with a non-center part of the second rotating part, and the second rotating part is abutted against the lens barrel. 
     
     
         3 . The lens device according to  claim 1 , wherein the lens device further comprises a case, the lens barrel comprises a projection, and the lens barrel is disposed in the case, wherein when the first movable part is rotated, the first movable part pushes the projection to move the lens barrel. 
     
     
         4 . The lens device according to  claim 1 , wherein the lens device further comprises a case, and the lens device comprises an elastic member disposed between the case and the lens barrel. 
     
     
         5 . The lens device according to  claim 1 , wherein the lens device further comprises a case, and the lens barrel comprises a connecting rod connected to a non-axis center part of the first movable part, wherein when the first movable part is rotated, the first movable part drives the connecting rod to move the lens barrel. 
     
     
         6 . The lens device according to  claim 1 , wherein the second movable part comprises a first sub-movable part and a second sub-movable part that are coaxial, the lens device further comprises a third movable part coaxial with the power machine, the third movable part is coupled to the first sub-movable part, and the second sub-movable part is coupled to the first movable part. 
     
     
         7 . The lens device according to  claim 1 , wherein the first movable part includes a worm gear, and the second movable part includes a worm. 
     
     
         8 . The lens device according to  claim 1 , wherein the first movable part or the second movable part includes a gear set. 
     
     
         9 . The lens device according to  claim 1 , wherein the first movable part or the second movable part includes a friction wheel set. 
     
     
         10 . The lens device according to  claim 1 , wherein a power machine is chosen from the group of a step motor, a synchronous motor, and a permanent magnet synchronous motor. 
     
     
         11 . A lens device, comprising:
 a motor;   a parts set, comprising:
 an active member linked to the motor; and 
 a follower linked to the active member and driven by the active member to rotate; 
   a lens barrel linked to the follower and driven by the follower to perform a linear reciprocating motion; and   a lens disposed in the lens barrel, wherein within a fixed time, a number of turns of the active member is N times of a number of turns of the follower, and a value of N is greater than or equal to 10.   
     
     
         12 . The lens device according to  claim 11 , wherein the follower comprises a first follower and a second follower, the first follower is coupled to the active member, and the second follower is abutted against the lens barrel. 
     
     
         13 . The lens device according to  claim 11 , wherein the lens device further comprises a case, and the lens barrel comprises a projection, and the lens barrel is disposed in the case, wherein when the second follower is rotated, the second follower pushes the projection to move the lens barrel. 
     
     
         14 . The lens device according to  claim 11 , wherein the lens device further comprises a case, and the lens device comprises an elastic member disposed between the case and the lens barrel. 
     
     
         15 . The lens device according to  claim 11 , wherein the lens device further comprises a case, and the lens barrel comprises a connecting rod connected to a non-axis center part of the follower, wherein when the follower is rotated, the follower drives the connecting rod to move the lens barrel. 
     
     
         16 . The lens device according to  claim 11 , wherein the active member comprises a first active member and a second active member that are coaxial, the lens device further comprises a third active member coaxial with the motor, the third active member is coupled to the first active member, and the second active member is coupled to the follower. 
     
     
         17 . The lens device according to  claim 11 , wherein the active member is driven by the motor to rotate. 
     
     
         18 . The lens device according to  claim 11 , wherein the follower includes a worm gear, and the active member includes a worm. 
     
     
         19 . The lens device according to  claim 11 , wherein the follower or the active member includes a gear set. 
     
     
         20 . The lens device according to  claim 11 , wherein the follower or the active member includes a gear set.