A rear adapter module for a finite conjugate optical assembly and camera is configured to couple with a core zoom module. A lens assembly of the rear adapter module includes three or more lens elements and has a positive focal length. The lens assembly exhibits a pupil size of between 16 and 25 mm and a pupil depth greater than 50 mm.

A magnification adjustable projection system includes an imaging system having a first pair of cylindrical lens plates located within an object or image space. The first pair of cylindrical lens plates includes a first cylindrical lens plate axially movable relative to a second cylindrical lens plate. A second pair of cylindrical lens plates is located within the object or image space in optical alignment with the first pair of cylindrical lens plates. The second pair of cylindrical lens plates includes a third cylindrical lens plate axially movable relative to a fourth cylindrical lens plates. First and second actuators adjusts distances between the first and second cylindrical lens plates and between the third and fourth cylindrical lens plates. The first and second pairs of cylindrical lens plates have first and second cylindrical transverse axes that are approximately 45° relative to each other.

The invention relates to an optical zoom device (1) Optical zoom device (1), comprising a first lens assembly (2), and a second lens assembly (3) following the first lens assembly (2) in the direction of an optical axis (A) of the optical zoom device (1) so that light (L) can pass through the first lens assembly (2) and thereafter through the second lens assembly when travelling along the optical axis (A), wherein said lens assemblies each comprise a focus-adjustable lens (31, 32) as well as an electropermanent magnet (107, 207) or a shape memory alloy (120, 220) for actuating the respective lens (31, 32).

The disclosure provides a combined zoom dual-camera lens assembly, which includes a first lens group and a second lens group, wherein a field of view of the second lens group is larger than a field of view of the first lens group, and a thickness of the second lens group is smaller than a thickness of the first lens group; and a total effective focal length f.sub.T of the first lens group and a total effective focal length f.sub.W of the second lens group meet f.sub.T/f.sub.W>9.00.

A high etendue modular finite conjugate lens assembly has a zooming component with multiple lens groups, including four lens groups that each feature a doublet, and a lens attachment lens assembly comprising a fifth doublet, wherein the lens assembly is configured to exhibit between 0.45 and 4.65 mm.sup.2sr of etendue, and a ratio of highest to lowest magnification between 5.5:1 and 16:1, and a magnification of at least 2× at one or more points of a zoom range.

An optical system is provided in the present disclosure, including a first movable portion, a fixed portion, a first driving assembly, and a circuit assembly. The first movable portion is connected to a first optical element. The first movable portion is movable relative to the fixed portion. The first driving assembly drives the first movable portion to move relative to the fixed portion. The circuit assembly is electrically connected to the first driving assembly.

An optical system includes a first movable portion, a fixed portion, a first driving assembly and a first guiding structure. The first movable portion is connected to a first optical element. The movable portion is movable relative to the fixed portion. The first driving assembly drives the first movable portion to move relative to the fixed portion. The first guiding structure guides the first movable portion to move relative to the fixed portion in a first dimension.

A driving mechanism for driving an optical element is provided, including a fixed part, a movable part, a bobbin, and a driving assembly. The movable part is movably connected to the fixed part and holds the optical element. The bobbin is disposed on the fixed part or the movable part. The driving assembly drives the movable part to move relative to the fixed part and has a coil disposed on the bobbin. The fixed part has a main body, and the main body forms a recess for receiving the bobbin.

An optical system is provided in the present disclosure, including a fixed portion, a first movable portion, a first driving assembly, a second movable portion, and a second driving assembly. The first movable portion is connected to a first optical element. The first movable portion is movable relative to the fixed portion. The first driving assembly drives the first movable portion to move relative to the fixed portion. The second movable portion is connected to a second optical element. The second movable portion is movable relative to the fixed portion and the first movable portion. The second driving assembly drives the second movable portion to move relative to the fixed portion. The first driving assembly provides a first driving force via a first piezoelectric unit. The first movable portion is driven by the first driving force to move relative to the fixed portion.

An optical system is provided in the present disclosure, including a first movable portion, a fixed portion, a first driving assembly, and a circuit assembly. The first movable portion is connected to a first optical element. The first movable portion is movable relative to the fixed portion. The first driving assembly drives the first movable portion to move relative to the fixed portion. The first movable portion is movably connected to the fixed portion via the circuit assembly.