A linear motor capable of improving power efficiency while preventing enlargement. A winding core direction of a coil coincide with a thrust direction of the linear motor. A center yoke is arranged inside the coil extending in the thrust direction. A magnet faces the center yoke outside the coil so that its magnetization direction is perpendicular to the thrust direction. A back yoke adjoins the main magnet at an opposite side of the center yoke. Two sub magnets adjoin the main magnet and their magnetization directions are inclined by 90 to that of the main magnet. Two side yokes adjoin the center and back yokes at both sides a magnet group in the thrust direction. Surfaces of the main magnet that adjoin the sub magnets incline inward toward the back yoke. Surfaces of the sub magnets that adjoin the main magnet incline inward toward the center yoke.

A linear motor capable of improving power efficiency while preventing enlargement. A winding core direction of a coil coincide with a thrust direction of the linear motor. A center yoke is arranged inside the coil extending in the thrust direction. A magnet faces the center yoke outside the coil so that its magnetization direction is perpendicular to the thrust direction. A back yoke adjoins the main magnet at an opposite side of the center yoke. Two sub magnets adjoin the main magnet and their magnetization directions are inclined by 90 to that of the main magnet. Two side yokes adjoin the center and back yokes at both sides a magnet group in the thrust direction. Surfaces of the main magnet that adjoin the sub magnets incline inward toward the back yoke. Surfaces of the sub magnets that adjoin the main magnet incline inward toward the center yoke.

A knob assembly and a follow focus remote controller are disclosed. The knob assembly includes a base, a rotating assembly, and a damping adjustment assembly. The rotating assembly is rotatably mounted on the base. The damping adjustment assembly includes a damping member and an actuator. The damping member is positioned between the base and the actuator. The actuator can drive the damping member to move, thereby altering the insertion depth of an insertion segment into a damping groove for housing damping grease. The damping grease creates a sticky sensation between the damping member and the base, enabling the user to adjust the damping feel to their preference and providing excellent damping feedback.

A knob assembly and a follow focus remote controller are disclosed. The knob assembly includes a base, a rotating assembly, and a damping adjustment assembly. The rotating assembly is rotatably mounted on the base. The damping adjustment assembly includes a damping member and an actuator. The damping member is positioned between the base and the actuator. The actuator can drive the damping member to move, thereby altering the insertion depth of an insertion segment into a damping groove for housing damping grease. The damping grease creates a sticky sensation between the damping member and the base, enabling the user to adjust the damping feel to their preference and providing excellent damping feedback.