Driving mechanism
A driving mechanism for moving an optical element is provided, including a fixed part, a movable part, and a driving assembly. The movable part is movably connected to the fixed part, wherein the optical element is disposed on the movable part. The driving assembly is configured to drive the movable part to move relative to the fixed part.
1 . A driving mechanism for moving an optical element, comprising:
a fixed part, having a base and a housing connected to each other;
a movable part, movably connected to the fixed part, wherein the optical element is disposed on the movable part and has an optical axis;
a driving assembly, configured to drive the movable part to move relative to the fixed part;
a frame affixed in the housing, having a top portion and a plurality of extending portions extending from the top portion toward the base, wherein the movable part is received in the frame, and when the movable part moves relative to the fixed part to a limit position along the optical axis, the movable part contacts the top portion of the frame to prevent from collision with the housing;
a first circuit board, disposed on the frame;
at least a first conductive member, embedded in the top portion of the frame;
a magnet, disposed on the movable part;
a magnetic field sensor, disposed on the first circuit board for detecting the position of the magnet;
a second circuit board, wherein the first and second circuit boards are disposed on opposite sides of the frame, and the first conductive member is electrically connected to the first and second circuit boards;
a temperature sensor, disposed on the second circuit board; and
a plurality of first conductive members, extending downward on opposite sides of the second circuit board and protruding from the base.
2 . The driving mechanism as claimed in claim 1 , wherein the driving assembly includes a coil disposed on the movable part and a magnetic element disposed between the extending portions.
3 . The driving mechanism as claimed in claim 1 , wherein the temperature sensor faces the housing.
4 . The driving mechanism as claimed in claim 1 , wherein the magnetic field sensor and the temperature sensor face the same direction.
5 . The driving mechanism as claimed in claim 1 , wherein the driving assembly includes a coil and a magnetic element, and the frame is shaped in an octagon that includes a long side and a short side adjacent to each other, wherein the coil is disposed on the movable part, and the magnetic element is disposed on the long side of the frame.
6 . The driving mechanism as claimed in claim 5 , wherein the long side of the frame is 2 to 20 times of the short side.
7 . The driving mechanism as claimed in claim 5 , further comprising a rod affixed to the base and in contact with the movable part, wherein the movable part is slidable along the rod relative to the fixed part, and the rod is located adjacent to the short side of the frame and spaced away from the first circuit board.
8 . The driving mechanism as claimed in claim 1 , wherein the coil has a central axis offset from the optical axis in a horizontal direction that is perpendicular to the optical axis.
9 . The driving mechanism as claimed in claim 1 , further comprising a second conductive member embedded in the base and electrically connected to the first conductive member.
10 . The driving mechanism as claimed in claim 1 , further comprising a rod, wherein the base has a column affixed to the rod, and the rod contacts the movable part.
11 . The driving mechanism as claimed in claim 10 , further comprising a plurality of wires, wherein the driving assembly includes a plurality of coils and magnetic elements, the movable part has a plurality of bobbins, the wires connect the coils to the bobbins, and the column is higher than the bobbins on the top side of the movable part.
12 . The driving mechanism as claimed in claim 11 , wherein the movable part has a contact portion in contact with the rod, the column and the contact portion are located between two of the bobbins, and the contact portion is slidable along the rod.
13 . The driving mechanism as claimed in claim 11 , further comprising an upper spring sheet, wherein the coils are disposed on the movable part, and the magnetic elements are disposed on the frame, wherein the upper spring sheet is disposed on the top side of the movable part and electrically connected to the wires wound on the bobbins.
14 . The driving mechanism as claimed in claim 1 , wherein the housing has an opening, and the frame has a hole that is larger than the opening, wherein the optical axis passes through the opening and the hole.
15 . A driving mechanism for moving an optical element, comprising:
a fixed part, having a base and a housing connected to each other;
a movable part, movably connected to the fixed part, wherein the optical element is disposed on the movable part and has an optical axis;
a driving assembly, configured to drive the movable part to move relative to the fixed part;
a frame, affixed in the housing, wherein the movable part is received in the frame, and when the movable part moves relative to the fixed part along the optical axis to a limit position, the movable part contacts the frame to prevent from collision with the housing; and
a plurality of upper spring sheets, a lower spring sheet and a metal sheet, wherein the driving assembly includes a plurality of coils and magnetic elements, the coils are disposed on the movable part, the upper spring sheets are disposed on the top side of the movable part, the magnetic elements are disposed on the frame, and the coils are electrically connected by the upper spring sheets and the metal sheet, wherein the metal sheet extends from the top side of the movable part to the bottom side of the movable part to electrically connect to the lower spring sheet.