A light-folding element includes an object-side surface, an image-side surface, a reflection surface and a connection surface. The reflection surface is configured to reflect imaging light passing through the object-side surface to the image-side surface. The connection surface is connected to the object-side, image-side and reflection surfaces. The light-folding element has a recessed structure located at the connection surface. The recessed structure is recessed from the connection surface an includes a top end portion, a bottom end portion and a tapered portion located between the top end and bottom end portions. The top end portion is located at an edge of the connection surface. The tapered portion has two tapered edges located on the connection surface. The tapered edges are connected to the top end and bottom end portions. A width of the tapered portion decreases in a direction from the top end portion towards the bottom end portion.

An optical member driving mechanism is provided. The optical member driving mechanism includes a fixed portion, a movable portion, an electromagnetic driving assembly and an elastic member. The fixed portion has a base and a frame that is disposed on the base. The movable portion is movable relative to the fixed portion, and includes a carrier for carrying an optical member with an incident optical axis. The carrier includes a body and a sidewall that extends along the edge of the body. The electromagnetic driving assembly drives the movable portion to move relative to the fixed portion. The movable portion is movably connected to the fixed portion via the elastic member, wherein as viewed along the incident optical axis, the sidewall and the elastic member at least partially overlap.

An optical system is provided. The optical system includes a second optical module for driving a second optical element. The second optical module includes a second immovable part, a second movable part, a second driving assembly, and a second guiding assembly. The second movable part is used for connected to the second optical element. The second movable part is movable relative to the second immovable part. The second driving assembly is used for driving the second movable part to move relative to the second immovable part. The second guiding assembly is used for guiding the second movable part to move relative to the second immovable part in a first dimension.

An optical system is provided. The optical system includes a second optical module for driving a second optical element. The second optical module includes a second immovable part, a second movable part, a second driving assembly, and a second guiding assembly. The second movable part is used for connected to the second optical element. The second movable part is movable relative to the second immovable part. The second driving assembly is used for driving the second movable part to move relative to the second immovable part. The second guiding assembly is used for guiding the second movable part to move relative to the second immovable part in a first dimension.

Provided are a prism apparatus applied to a periscope lens module and a periscope lens module. The prism apparatus includes a bearing frame; a supporting-restoring assembly rotatably mounted on the bearing frame; a prism rotatable with the supporting-restoring assembly; and shape memory alloy wires configured to drive the supporting-restoring assembly and the prism to rotate with respect to the bearing frame. The supporting-restoring assembly includes a shape memory alloy wire-supporting frame rotatably connected to the bearing frame, and an elastic support member elastically connected to the bearing frame. The prism is mounted on the elastic support member. The shape memory alloy wires are connected between the bearing frame and the shape memory alloy wire-supporting frame. In the present invention, the shape memory alloy wires replace the electromagnetic drive and are used to drive the supporting-restoring assembly to rotate relative to the bearing frame, and the prism can automatically correct angle.

Provided are a prism apparatus applied to a periscope lens module and a periscope lens module. The prism apparatus includes a bearing frame; a supporting-restoring assembly rotatably mounted on the bearing frame; a prism rotatable with the supporting-restoring assembly; and shape memory alloy wires configured to drive the supporting-restoring assembly and the prism to rotate with respect to the bearing frame. The supporting-restoring assembly includes a shape memory alloy wire-supporting frame rotatably connected to the bearing frame, and an elastic support member elastically connected to the bearing frame. The prism is mounted on the elastic support member. The shape memory alloy wires are connected between the bearing frame and the shape memory alloy wire-supporting frame. In the present invention, the shape memory alloy wires replace the electromagnetic drive and are used to drive the supporting-restoring assembly to rotate relative to the bearing frame, and the prism can automatically correct angle.

An optical element driving device is described that includes a fixed portion having supporting holes, a holding member having a supporting portion supporting an optical element, and a supporting shaft supporting the holding member. The fixed portion is disposed at positions of two end portions of the supporting shaft to support the supporting shaft in the supporting holes in a rockable manner. A resin with viscoelasticity is filled between the outer peripheral surface of the supporting shaft which is rockable in the supporting holes and an inner peripheral surface of the supporting hole of the fixed portion.

A projection apparatus having a light modulation element includes a main body; an optical unit that is rotatably supported by the main body and includes a projection optical system for projecting the spatially modulated light onto the projection surface, a first rotation member rotatably supported to the main body and a second rotation member rotatably supported to the first rotation member; a first sensor; a second sensor; a controller; and a regulation mechanism, and the regulation mechanism includes a moving member that is movable between a regulation position for regulating the rotation and a regulation release position for releasing the regulating of the rotation, and fixes the moving member at the regulation position in a case where the controller determines that the first rotation member and the second rotation member are in the predetermined specific rotation state.

An optical element driving mechanism has an optical axis and includes a fixed portion, a movable portion, and a driving assembly. The movable portion is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion, wherein the driving assembly moves along a first direction to move the movable portion along a second direction, the first direction is different from the second direction.

An optical element driving mechanism has an optical axis and includes a fixed portion, a movable portion, and a driving assembly. The movable portion is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion, wherein the driving assembly moves along a first direction to move the movable portion along a second direction, the first direction is different from the second direction.