Driving mechanism
A driving mechanism for moving an optical element is provided. The driving mechanism includes a fixed part, a movable part, and a driving assembly. The movable part is movably connected to the fixed part for holding the optical element. The driving assembly is configured for moving the movable part relative to the fixed part.
1 . A driving mechanism for moving an optical element, comprising:
a fixed part, having a housing and a base connected to each other;
a movable part, movably connected to the fixed part for holding the optical element;
a driving assembly, configured for moving the movable part relative to the fixed part, wherein the driving assembly has a coil and a magnetic element, the coil is disposed on the movable part, and the magnetic element and the movable part are received in the housing; and
a thin magnetic-permeable element, having a shielding portion located between the magnetic element and a sidewall of the housing, wherein a gap is formed between the shielding portion of the magnetic-permeable element and the sidewall of the housing.
2 . The driving mechanism as claimed in claim 1 , wherein the magnetic permeability of the magnetic-permeable element is greater than that of the housing.
3 . The driving mechanism as claimed in claim 1 , wherein the shielding portion of the magnetic-permeable element is angled relative to the sidewall of the housing.
4 . The driving mechanism as claimed in claim 1 , further comprising a glue disposed in the gap.
5 . A driving mechanism for moving an optical element, comprising:
a fixed part, having a housing and a base connected to each other;
a movable part, movably connected to the fixed part for holding the optical element;
a driving assembly, configured for moving the movable part relative to the fixed part, wherein the driving assembly has a coil and a magnetic element, the coil is disposed on the movable part, and the magnetic element and the movable part are received in the housing; and
a thin magnetic-permeable element, having a shielding portion located between the magnetic element and a sidewall of the housing, wherein the shielding portion has a first segment and a second segment that is not parallel to the first segment.
6 . The driving mechanism as claimed in claim 5 , wherein the first segment is parallel to the sidewall of the housing, and the second segment is angled relative to the sidewall of the housing.
7 . The driving mechanism as claimed in claim 6 , wherein the first segment and the sidewall of the housing are connected to each other by welding.
8 . The driving mechanism as claimed in claim 7 , wherein a gap is formed between the second segment and the sidewall of the housing.
9 . The driving mechanism as claimed in claim 8 , further comprising a glue disposed in the gap.
10 . A driving mechanism for moving an optical element, comprising:
a fixed part, having a housing and a base connected to each other;
a movable part, movably connected to the fixed part for holding the optical element;
a driving assembly, configured for moving the movable part relative to the fixed part, wherein the driving assembly has a coil and a magnetic element, the coil is disposed on the movable part, and the magnetic element and the movable part are received in the housing;
a thin magnetic-permeable element, having a shielding portion located between the magnetic element and a sidewall of the housing; and
an upper resilient element, connecting the movable part to the housing, wherein the upper resilient element forms several slots, the magnetic-permeable element forms a hole, and the slots and the hole at least partially overlap when viewed in a direction parallel to an optical axis of the optical element,
wherein the upper resilient element further forms several ribs between the slots, and the ribs and the hole at least partially overlap when viewed in the direction parallel to the optical axis of the optical element.
11 . The driving mechanism as claimed in claim 10 , wherein the housing has a top portion, the sidewall is connected between the top portion and the base, and a depressed structure is formed at a corner of the top portion, wherein the upper resilient element is disposed on the depressed structure and located between the depressed structure and the magnetic-permeable element.
12 . The driving mechanism as claimed in claim 11 , wherein the slots, the hole, and the depressed structure at least partially overlap when viewed in the direction parallel to the optical axis of the optical element.
13 . The driving mechanism as claimed in claim 11 , wherein a part of the upper resilient element is clamped between the magnetic element and the depressed structure.
14 . The driving mechanism as claimed in claim 10 , wherein the upper resilient element has an inner connection portion, an outer connection portion, and a plurality of deformable portions connected between the inner and outer connection portions, the inner connection portion is connected to the movable part, the outer connection portion is connected to the fixed part, and the slots are formed on the outer connection portion.
15 . The driving mechanism as claimed in claim 14 , wherein the outer connection portion has a quadrilateral structure, and the slots are arranged at at least a corner of the outer connection portion.
16 . The driving mechanism as claimed in claim 10 , wherein the magnetic-permeable element has a quadrilateral structure, and the hole is located at a corner of the magnetic-permeable element.
17 . The driving mechanism as claimed in claim 10 , wherein the optical element has an optical axis, and the magnetic-permeable element has a U-shaped structure when viewed in a direction perpendicular to the optical axis.