Optical system

1 . An optical system, comprising:

a first optical element driving mechanism, comprising:

a first fixed assembly, comprising a first frame;

a first movable assembly, configured to be connected to at least two first optical elements, wherein the first movable assembly is movable relative to the first fixed assembly, and the first movable assembly comprises a first movable element;

a first rolling assembly, disposed between the first frame and the first movable element; and

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

wherein the first driving assembly is configured to drive the first movable element to move around a main axis, and a portion of the first driving assembly is disposed on the first movable element;

wherein the first frame does not overlap with the first movable element when viewed along the main axis;

wherein when viewed along a direction perpendicular to the main axis and toward the main axis, the first rolling assembly is fully exposed from the first movable element;

wherein when viewed along a direction perpendicular to the main axis and away from the main axis, the first rolling assembly is fully exposed from the first frame;

wherein the optical system further comprises a second optical element driving mechanism;

wherein the first optical element driving mechanism is disposed on the second optical element driving mechanism;

wherein the second optical element driving mechanism comprises:

a second fixed assembly;

a second movable assembly, configured to be connected to a second optical element; and

a second driving assembly, configured to drive the second movable assembly and the second optical element to move relative to the second fixed assembly;

wherein the second fixed assembly comprises a casing;

wherein the second optical element driving mechanism further comprises an anti-reflection element disposed on a top surface of the casing;

wherein the anti-reflection element is made of a plastic material;

wherein the casing is made of a metal material;

wherein the anti-reflection element has an opening:

wherein the casing has a casing opening;

wherein a pore diameter of the opening is smaller than a pore diameter of the casing opening; and

wherein the anti-reflection element completely covers the top surface of the casing.

2 . The optical system as claimed in claim 1 , wherein

the first fixed assembly comprises an outer shielding member;

wherein the outer shielding member is affixed to the first frame; and

the first frame is located between the outer shielding member and the first base.

3 . The optical system as claimed in claim 2 , wherein

the first movable element is disposed in the first frame;

the first movable element is rotatable around the main axis relative to the first frame;

the first rolling assembly is disposed between the first movable element and the first base;

the first rolling assembly comprises at least three first rolling elements;

the first movable element rotates around the main axis relative to the first base and the first frame by the first rolling elements;

the first frame has at least three accommodating grooves;

the first movable element has at least three grooves, respectively corresponding to the at least three accommodating grooves;

the first base has at least three grooves, respectively corresponding to the at least three grooves of the first movable element; and

the first rolling element is disposed in the corresponding accommodating groove, the corresponding groove of the first base and the corresponding groove of the first movable element.

4 . The optical system as claimed in claim 3 , wherein

when viewed along the main axis, each of the accommodating grooves has two side surfaces and a connecting surface;

the connecting surface is connected between the two side surfaces;

the connecting surface is neither parallel nor perpendicular to the two side surfaces;

a minimum distance between the two side surfaces is less than a diameter of the first rolling element;

one of the three first rolling elements is configured to be in contact with the two side surfaces of the corresponding accommodating groove instead of being in contact with the corresponding connecting surface; and

the other two of the three first rolling elements are configured to be in contact with the connecting surface of the corresponding accommodating groove.

5 . The optical system as claimed in claim 4 , wherein

the at least two first optical elements are movably connected to the first movable element;

when the first movable element rotates around the main axis, the at least two first optical elements move relative to the first fixed assembly and the first movable assembly, so as to adjust the amount of external light entering the first optical element driving mechanism; and

when viewed along the main axis, the outer shielding member has a ring structure and a first outer opening.

6 . The optical system as claimed in claim 5 , wherein

there are at least two first guiding grooves formed on the outer shielding member;

each of a part of the at least two first optical elements has a first upper protruding pillar and a first lower protruding pillar formed respectively on opposite surfaces of the corresponding first optical element;

each of the other part of the at least two first optical elements has a second upper protruding pillar and a second lower protruding pillar formed respectively on opposite surfaces of the corresponding first optical element;

the first upper protruding pillar and the second upper protruding pillar extend along the main axis toward the outer shielding member;

the first lower protruding pillar and the second lower protruding pillar extend along the main axis toward the first base;

when viewed along the main axis, the first upper protruding pillar does not overlap the first lower protruding pillar; and

when viewed along the main axis, the second upper protruding pillar does not overlap the second lower protruding pillar.

7 . The optical system as claimed in claim 6 , wherein

the first lower protruding pillar and the second lower protruding pillar are configured to be inserted into the first movable element;

each of the at least two first guiding grooves is configured to accommodate the corresponding first upper protruding pillar and the second upper protruding pillar;

when the first movable element rotates around the main axis, a part of the at least two first optical elements rotates around the first lower protruding pillar, and the first upper protruding pillar is configured to move along the corresponding first guiding groove; and

when the first movable element rotates around the main axis, the other part of the at least two first optical elements rotates around the second lower protruding pillar, and the second upper protruding pillar is configured to move along the corresponding first guiding groove.

8 . The optical system as claimed in claim 7 , wherein

each of the at least two first optical elements has a plate-shaped structure;

the main axis is perpendicular to an extending direction of the plate-shaped structure;

when viewed in a direction perpendicular to the main axis, a distance between a part of the at least two first optical elements and the first base in the main axis is different from a distance between the other part of the at least two first optical elements and the first base in the main axis; and

when viewed in a direction perpendicular to the main axis, a length of the first upper protruding pillar is different from a length of the second upper protruding pillar.

9 . The optical system as claimed in claim 8 , wherein

when viewed in a direction perpendicular to the main axis, the length of the first upper protruding pillar is less than the length of the second upper protruding pillar;

when viewed in a direction perpendicular to the main axis, a length of the first lower protruding pillar is different from a length of the second lower protruding pillar; and

when viewed in a direction perpendicular to the main axis, the length of the first lower protruding pillar is greater than the length of the second lower protruding pillar.

10 . The optical system as claimed in claim 9 , wherein

the second fixed assembly further comprises

a second base;

wherein the casing is affixed to the second base to form an accommodation space; and

the accommodation space is configured to accommodate the second movable assembly and the second driving assembly.

11 . The optical system as claimed in claim 10 , wherein

the casing surrounds a portion of the first optical element driving mechanism;

when viewed in a direction perpendicular to the main axis, a portion of the first optical element driving mechanism protrudes from the casing;

the second movable assembly comprises a holder and a second frame;

at least a portion of the first optical element driving mechanism is disposed on the second optical element;

the second frame surrounds a portion of the first optical element driving mechanism; and

when viewed in a direction perpendicular to the main axis, the second frame overlaps at least a portion of the first frame.

12 . The optical system as claimed in claim 11 , wherein

the first movable element comprises a first body and a radial extending portion;

the first body has a ring structure;

the radial extending portion radially extends from the first body;

the radial extending portion has a receiving groove; and

the first driving assembly comprises a first magnetic element disposed in the receiving groove.

13 . The optical system as claimed in claim 12 , wherein

when viewed along the main axis, the radial extending portion has an arc-shaped structure;

when viewed along the main axis, the first magnetic element has an arc-shaped structure;

a shape of the arc-shaped structure of the first magnetic element corresponds to a shape of the arc-shaped structure of the radial extending portion;

when viewed along a first axis, the first magnetic element is exposed from the casing;

the first axis is perpendicular to the main axis; and

when viewed in a direction perpendicular to the main axis, the first magnetic element overlaps the top surface of the casing.

14 . The optical system as claimed in claim 13 , wherein

the second optical element driving mechanism further comprises a circuit assembly electrically connected to the first driving assembly and the second driving assembly;

the circuit assembly comprises a substrate, a sharing element, a first circuit element and a second circuit element;

the sharing element, the first circuit element and the second circuit element are integrally formed as one piece;

the substrate is disposed on the second base;

the sharing element, the first circuit element and the second circuit element each has a long strip-shaped structure;

the sharing element extends along a second axis from the substrate;

the second axis is perpendicular to the first axis; and

the second axis is parallel to the main axis.

15 . The optical system as claimed in claim 14 , wherein

the first circuit element is configured to be electrically connected to the first driving assembly;

when viewed along the first axis, the first circuit element extends in a first direction from the sharing element;

the second circuit element is configured to be electrically connected to a second position sensing element;

when viewed along the first axis, the second circuit element extends in a second direction from the sharing element; and

the first direction is the opposite of the second direction.

16 . The optical system as claimed in claim 15 , wherein

the first circuit element comprises a first extending portion, a second extending portion, a third extending portion and a first contact portion;

the first extending portion is connected between the sharing element and the second extending portion;

the second extending portion is connected between the first extending portion and the third extending portion;

the third extending portion is connected to the first contact portion;

when viewed along the main axis, the first extending portion and the third extending portion extend along a third axis; and

the third axis is perpendicular to the second axis and the first axis.

17 . The optical system as claimed in claim 16 , wherein

when viewed along the main axis, the second extending portion and the first contact portion extend along the first axis;

when viewed along the main axis, the first extending portion, the second extending portion, the third extending portion and the first contact portion contact the second frame;

the second frame has a front side wall and a concave structure;

the concave structure is concaved from the front side wall along the third axis; and

the third extending portion and the first contact portion are disposed in the concave structure.

18 . The optical system as claimed in claim 17 , wherein

the first driving assembly further comprises a first coil;

the first coil is fixedly disposed on the first contact portion;

the second frame further has a positioning structure;

the positioning structure has a long strip-shaped structure that extends along the second axis; and

the first contact portion is fixedly connected to the positioning structure.

19 . The optical system as claimed in claim 18 , wherein

when viewed along the third axis, the first coil is located in the positioning structure;

when viewed along the third axis, the first contact portion completely covers the first coil; and

when viewed along the third axis, the first contact portion, the positioning structure and the first coil extend beyond the second optical element driving mechanism.

20 . An optical system, comprising:

a first optical element driving mechanism, comprising:

a first fixed assembly, comprising a first frame;

a first movable assembly, configured to be connected to at least two first optical elements, wherein the first movable assembly is movable relative to the first fixed assembly, and the first movable assembly comprises a first movable element;

a first rolling assembly, disposed between the first frame and the first movable element; and

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

wherein the first driving assembly is configured to drive the first movable element to move around a main axis, and a portion of the first driving assembly is disposed on the first movable element;

wherein the first frame does not overlap with the first movable element when viewed along the main axis;

wherein at least a portion of the first rolling assembly does not overlap with the first frame and the first movable element when viewed along the main axis;

wherein the optical system further comprises a second optical element driving mechanism;

wherein the first optical element driving mechanism is disposed on the second optical element driving mechanism;

wherein the second optical element driving mechanism comprises:

a second fixed assembly;

a second movable assembly, configured to be connected to a second optical element; and

a second driving assembly, configured to drive the second movable assembly and the second optical element to move relative to the second fixed assembly;

wherein the second fixed assembly comprises a casing;

wherein the second optical element driving mechanism further comprises an anti-reflection element disposed on a top surface of the casing;

wherein the anti-reflection element is made of a plastic material;

wherein the casing is made of a metal material;

wherein the anti-reflection element has an opening;

wherein the casing has a casing opening;

wherein a pore diameter of the opening is smaller than a pore diameter of the casing opening; and

wherein the anti-reflection element completely covers the top surface of the casing.

21 . An optical system, comprising:

a first optical element driving mechanism, comprising:

a first fixed assembly, comprising a first frame, wherein the first frame has at least three accommodating grooves;

a first movable assembly, configured to be connected to at least two first optical elements, wherein the first movable assembly is movable relative to the first fixed assembly, and the first movable assembly comprises a first movable element, and the first movable element has at least three grooves, respectively corresponding to the at least three accommodating grooves;

a first rolling assembly, comprising at least three first rolling elements, the first rolling element is disposed in the accommodating groove and the groove of the first movable element; and

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

wherein the first driving assembly is configured to drive the first movable element to move around a main axis, and a portion of the first driving assembly is disposed on the first movable element;

wherein the first frame does not overlap with the first movable element when viewed along the main axis;

wherein the at least three accommodating grooves and the at least three grooves of the first movable element do not overlap when viewed along the main axis;

wherein the optical system further comprises a second optical element driving mechanism;

wherein the first optical element driving mechanism is disposed on the second optical element driving mechanism;

wherein the second optical element driving mechanism comprises:

a second fixed assembly;

a second movable assembly, configured to be connected to a second optical element; and

a second driving assembly, configured to drive the second movable assembly and the second optical element to move relative to the second fixed assembly;

wherein the second fixed assembly comprises a casing;

wherein the second optical element driving mechanism further comprises an anti-reflection element disposed on a top surface of the casing;

wherein the anti-reflection element is made of a plastic material;

wherein the casing is made of a metal material;

wherein the anti-reflection element has an opening;

wherein the casing has a casing opening;

wherein a pore diameter of the opening is smaller than a pore diameter of the casing opening; and

wherein the anti-reflection element completely covers the top surface of the casing.