A lens barrel includes a linear actuator that is disposed more to the outer peripheral side than the outer peripheral surface of a focus lens unit, and has two permanent magnets, a yoke unit, and a coil; and the focus lens unit that holds a focus lens and is driven back and forth along the optical axis direction. The permanent magnets are disposed substantially in parallel and spaced apart, with the same poles facing each other. The yoke unit includes a center yoke portion, a back yoke portion, and a yoke that magnetically couples the center yoke portion and the back yoke portion. The coil is wound around the center yoke portion, and its center is offset from the center of the two permanent magnets to the outer peripheral side with respect to the optical axis center of the focus lens.

A camera module includes a housing; a plurality of movable lens modules disposed in an internal space of the housing and configured to be movable in an optical axis direction, each of the plurality of movable lens modules comprising at least one lens; and a stopper configured to prevent contact between at least two of the plurality of movable lens modules, wherein the stopper includes a frame mounted on the housing; an extension portion extending from the frame into the internal space of the housing to face a side of one movable lens module of the plurality of movable lens modules in the optical axis direction; and a damping member disposed on the extension portion to face the side of the one movable lens module in the optical axis direction.

An optical system is provided, including a first optical module, a second optical module, and a light-quantity adjustment module. The first optical module, the second optical module, and the light-quantity adjustment module are arranged in a direction of an optical axis. The first optical module and the second optical module are movable in the direction of the optical axis.

The actuator assembly comprises a first part (102), a second part (110) and a helical bearing arrangement. The helical bearing arrangement is arranged to guide helical movement of the second part with respect to the first part around a helical axis H such that rotation of the second part around the helical axis is converted into helical movement of the second part. The first and second parts comprise respective stops (152, 162) that are arranged such that the stops are spaced from each other throughout an operating range of said helical movement of the second part relative to the first part. The stops are configured to engage if the second part is moved relative to the first part in at least one direction other than the direction of said helical movement such that the engagement of the stops restricts relative movement of the first and second parts.

Cameras with OIS capable of performing multi zoom super macro photography and handheld electronic devices comprising such cameras. A camera may include a lens comprising N lens elements L.sub.1-L.sub.N divided into two or more lens groups arranged along a lens optical axis starting with L.sub.1 on an object side and ending with L.sub.N on an image side, adjacent lens groups separated by a respective air-gap d.sub.1 along the lens optical axis; an image sensor with a sensor diagonal SD between 7 and 20 mm separated from lens element L.sub.N by an air-gap d.sub.2 along the lens optical axis; and an actuator for controlling air-gaps d.sub.1 and d.sub.2 to switch the camera between M≥1 operative pop-out states and a collapsed state and to focus the camera on an object at an object-lens distance of less than 30 cm.

A lens module includes: a carrier having an internal space; a lens unit including a plurality of lens groups, the lens unit being installed on the carrier such that at least one of the lens groups is configured to move in a length direction of the carrier; a lens guide assembly including a plurality of guide members disposed on side surfaces of each of the lens groups, and configured to guide movement of at least two lens groups among the plurality of lens groups; and at least two driving wires connected to the plurality of guide members and formed of a shape memory alloy.

In a camera device that includes a hand tremor correction mechanism, an anti-vibration mechanism for the camera device is provided. An optical system that is movable in an optical axis direction and includes a focus adjustment mechanism is provided in the camera device, includes an anti-vibration mechanism that performs hand tremor correction by anti-vibration of the imaging element, and includes from an object side, an imaging lens group, the anti-vibration mechanism, and an imaging element provided on the anti-vibration mechanism, and a plane perpendicular to the optical axis of the imaging lens group is used as a movement plane to allow the imaging element on the anti-vibration mechanism to move, so as to achieve hand tremor correction.

The present disclosure relates to a voice coil motor. The voice coil motor includes a base, an adjustment member, a first elastic member, a lens holder, a coil, at least one magnet, and a second elastic member. The base defines a through hole. The adjustment member is arranged in the through hole and is able to move along a central axis of the through hole relative to the base. The first elastic member is fixed on the base. The lens holder is fixed on the first elastic member. The coil is arranged surrounding an outer surface of the lens holder. The at least one magnet is arranged at an outer side of the coil. The second elastic member including an inner ring, the lens holder is fixed on the inner ring opposite to the first elastic member.

A zoom lens, a camera module, and a mobile terminal. The zoom lens includes a first lens group, a second lens group, and a third lens group arranged along an axis extending from an object side to an image side, where the first lens group is a fixed lens group with positive focal power nearest an object side, where the second lens group is a zoom lens group with negative focal power, where the third lens group is a compensative lens group with positive focal power nearest an image side to an image side, and where the second lens group is configured to move, in a zooming process of the zoom lens from a short-focal end to a long-focal end, toward the image side along an optical axis, and the where third lens group is configured to move toward the object side along the optical axis.

A lens interchangeable digital camera includes an image sensor in which a subject image is formed on an imaging surface through an imaging optical system including a zoom lens and a sensor movement type shake correction mechanism that performs a sensor movement operation of moving the image sensor in a direction to cancel a shake. A zoom operation determination unit determines whether or not a zoom operation in which the zoom lens moves is being performed. In a case where the zoom operation determination unit determines that the zoom operation is being performed, an operation deciding unit prohibits a shift operation which is at least a part of a sensor movement operation which is allowed while the zoom operation is stopped.