An optical system is provided. The optical system includes a first movable portion, a fixed portion, a first driving assembly, and a first sensing assembly. The first movable portion is used for connecting to an optical assembly having a main axis. The first movable portion is movable relative to the fixed portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion. The first sensing assembly is used for sensing the movement of the first movable portion relative to the fixed portion.

An optical element driving mechanism is provided. The optical element driving mechanism includes a first movable portion, a fixed portion, a first driving assembly, and a first guiding assembly. The first movable portion is used for connecting to a first optical element driving mechanism. The first optical element driving mechanism has a main axis that extends in a first direction. The first movable portion is movable relative to the fixed portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion. The first guiding assembly is used for guiding the movement of the fixed portion relative to the fixed portion.

An optical element driving mechanism is provided. The optical element driving mechanism includes a first movable portion, a fixed portion, a first driving assembly, and a first guiding assembly. The first movable portion is used for connecting to a first optical element driving mechanism. The first optical element driving mechanism has a main axis that extends in a first direction. The first movable portion is movable relative to the fixed portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion. The first guiding assembly is used for guiding the movement of the fixed portion relative to the fixed portion.

An attachment position adjustable membrane, including a membrane body and at least one attachment member. The membrane body allows light to pass through, and the membrane body is provided with at least one accommodating and guiding portion. The attachment member is movably disposed in the at least one accommodating and guiding portion, wherein the at least one attachment member is movable between a first position and a second position in the accommodating and guiding portion.

An attachment position adjustable membrane, including a membrane body and at least one attachment member. The membrane body allows light to pass through, and the membrane body is provided with at least one accommodating and guiding portion. The attachment member is movably disposed in the at least one accommodating and guiding portion, wherein the at least one attachment member is movable between a first position and a second position in the accommodating and guiding portion.

An optical element driving system is provided. The optical element driving system includes an optical element driving mechanism and a control assembly. The optical element driving mechanism includes a movable portion, a fixed portion, a driving assembly, and a position-sensing assembly. The movable portion is used for connecting to an optical element. The movable portion is movable relative to the fixed portion. The movable portion is in an accommodating space in the fixed portion. The driving assembly is used for driving the movable portion to move relative to the fixed portion. The control assembly provides a driving signal to the driving assembly to control the driving assembly. The position-sensing assembly is used for detecting the movement of the movable portion relation to the fixed portion and providing a motion-sensing signal to the control assembly.

An optical element driving mechanism is provided. The optical element driving mechanism includes a first movable portion, a fixed portion, a first driving assembly, and a first guiding assembly. The first movable portion is used for connecting to a first optical element driving mechanism. The first optical element driving mechanism has a main axis that extends in a first direction. The first movable portion is movable relative to the fixed portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion. The first guiding assembly is used for guiding the movement of the fixed portion relative to the fixed portion.

An optical element driving mechanism is provided. The optical element driving mechanism includes a first movable portion, a fixed portion, a first driving assembly, and a first guiding assembly. The first movable portion is used for connecting to a first optical element driving mechanism. The first optical element driving mechanism has a main axis that extends in a first direction. The first movable portion is movable relative to the fixed portion. The first driving assembly is used for driving the first movable portion to move relative to the fixed portion. The first guiding assembly is used for guiding the movement of the fixed portion relative to the fixed portion.

A lens barrel 10 comprises a first lens group frame 29, a rotating shaft 30, a plurality of barrier vanes 23a to 26b, an annular barrier sliding frame 28, and an annular stationary frame 27. The plurality of barrier vanes 23a to 26b rotate around the rotating shaft 30, and switch between an open state of exposing the surface of a first lens L1 in an imaging state, and a closed state of covering the surface of the first lens L1 in a collapsed state. The annular barrier sliding frame 28 is disposed on the subject side of the first lens group frame 29, and rotates the plurality of barrier vanes 23a to 26b upon rotating relatively around the optical axis with respect to the first lens group frame 29. The stationary frame 27 is disposed between the plurality of barrier vanes 23a to 26b and the barrier sliding frame 28 and fixed with respect to the first lens group frame 29, and supports the plurality of barrier vanes 23 a to 26b from the opposite side from the subject.

A scanning device including: a first, second and third scan mirrors; a first and second relay lenses; and a mirror; wherein the rotational axis of the second scan mirror is tilted with a first angle with respect to a reference plane, the optical axis of the first relay lens is tilted with the first angle with respect to the reference plane, the optical axis of the second relay lens is parallel to the reference plane and is orthogonal to that of the first relay lens, and the rotational axis of the first scan mirror is parallel to the reference plane; and the first and second scan mirrors, and first and second relay lenses are arranged such that the respective axes of the first and second scan mirrors, and first and second relay lenses lie on a plane that is tilted at the first angle with respect to the reference plane.