Driving mechanism for optical element

1. A driving mechanism for an optical element, comprising:

a fixed part;

a movable part, configured to connect to an optical element having an optical axis, and is movable relative to the fixed part, wherein the movable part comprises:

a first elastic element;

a second elastic element; and

a holder, suspended by the first elastic element and the second elastic element;

a driving assembly, configured to drive the movable part to move relative to the fixed part,

wherein the driving assembly comprises a driving coil, a driving magnetic element, and a magnetic isolation element, the driving coil and the driving magnetic element are respectively disposed on the movable part and the magnetic isolation element and are separated from the fixed part with the magnetic isolation element; and

a shock-absorbing element arranged between the movable part and the fixed part;

wherein the fixed part has a protruding column portion, and the shock-absorbing element is arranged between the protruding column portion and the movable part;

wherein the protruding column portion has an extension structure which extends toward the movable part, and the shock-absorbing element is connected to the extension structure;

wherein in the direction of the optical axis, the maximum length of the protruding column portion is greater than the maximum length of the extension structure.

2. The driving mechanism for an optical element as claimed in claim 1 , wherein

the magnetic isolation element is affixed to the fixed part, and when viewed in a direction that is perpendicular to the optical axis, the magnetic isolation element and the driving magnetic element at least partially overlap;

when viewed along the optical axis, the magnetic isolation element and the driving magnetic element at least partially overlap; and

the fixed part includes a housing, and the magnetic isolation element is disposed between the housing and the driving magnetic element.

3. The driving mechanism for an optical element as claimed in claim 2 , wherein the driving magnetic element is at least partially located between the magnetic isolation element and the first elastic element;

when viewed along the optical axis, a corner of the first elastic element is exposed to the magnetic isolation element; and

the corner of the first elastic element exposed by the magnetic isolation element is connected to the housing.

4. The driving mechanism for an optical element as claimed in claim 3 , wherein the housing has a concave portion corresponding to the exposed corner of the first elastic element;

the concave portion is recessed toward the first elastic element;

the fixed part includes a protruding column portion, and the first elastic element is connected to the protruding column portion;

when viewed in a direction that is perpendicular to the optical axis, the concave portion at least partially overlaps the magnetic isolation element; and

when viewed along the optical axis, the concave portion at least partially overlaps the first elastic element and the protruding column portion.

5. The driving mechanism for an optical element as claimed in claim 3 , wherein the fixed part further includes a base, and the housing corresponds to the base;

the first elastic element is connected to the base;

the base has a protruding column portion, and the first elastic element is connected to the protruding column portion;

the holder is between the first elastic element and the second elastic element;

the second elastic element is used for electrical conduction; and

the base further has a circuit member, and the second elastic element is electrically connected to the circuit member.

6. The driving mechanism for an optical element as claimed in claim 3 , wherein the magnetic isolation element has an inner notch, and a limit portion of the movable part is exposed to the inner notch;

the magnetic isolation element further has a dodge portion, wherein in a direction along the optical axis, the first elastic element is exposed to the dodge portion, and when viewed along the optical axis, the first elastic element protrudes from the dodge portion;

when viewed in a direction that is perpendicular to the optical axis, the magnetic isolation element completely covers the driving magnetic element;

when viewed along the optical axis, the shortest distance between the inner notch and the optical axis is less than the shortest distance between the dodge portion and the optical axis; and

when the movable part moves to a limit position, the limit part contacts the housing.

7. The driving mechanism for an optical element as claimed in claim 3 , further comprising a winding post arranged in the movable part for a lead wire of the driving coil to wind;

when viewed from a light incident direction of the driving mechanism for an optical element, the winding post is at least partially shielded by the movable part.

8. The driving mechanism for an optical element as claimed in claim 2 , wherein when viewed along a direction that is perpendicular to the optical axis, the magnetic isolation element has a C-shaped structure;

the magnetic isolation element includes an upper partition and two side partitions, and the two side partitions are connected by the upper partition;

when viewed in a direction that is perpendicular to the optical axis, the two side partitions are located between the housing and the driving magnetic element;

in the direction of the optical axis, the upper partition is located between the driving magnetic element and the housing;

the maximum width of each side partition in the direction of the optical axis is greater than the maximum width of the driving magnetic element along the optical axis;

when viewed in a direction that is perpendicular to the optical axis, the two side partitions at least partially overlap the driving coil; and

when viewed in a direction that is perpendicular to the optical axis, the two side partitions expose at least a portion of the driving coil.

9. The driving mechanism for an optical element as claimed in claim 2 ,

wherein the extension structure has an inclined surface inclined with respect to the optical axis.

10. The driving mechanism for an optical element as claimed in claim 1 , further comprising a limit structure for limiting the movement of the movable part along a direction that is perpendicular to the optical axis;

the limit structure is located between a plurality of columns of the protruding column portion of the fixed part;

the movable part has a groove, located at a side of the movable part which is not parallel to the side of the movable part where the driving magnetic element is disposed;

the limit structure is accommodated in the groove; and

when viewed along the optical axis, the thickness of the limit structure in a direction perpendicular to the optical axis is greater than the thickness of the groove in a direction perpendicular to the optical axis.