A zoom lens forms an intermediate image at a position conjugate to a reduction side imaging plane and forms the intermediate image again on a magnification side imaging plane. The zoom lens includes a plurality of lens groups including at least two movable lens groups, which move by changing spacings between the groups adjacent to each other in a direction of an optical axis during zooming, at a position closer to the reduction side than the intermediate image. Among the plurality of lens groups, a final lens group closest to the reduction side has a positive refractive power, and remains stationary with respect to the reduction side imaging plane during zooming. The zoom lens satisfies predetermined conditional expressions (1) and (2) about the focal lengths of the movable lens groups.

The present disclosure discloses a zoom lens assembly. The zoom lens assembly comprises, sequentially along an optical axis from an object side to an image side, a first lens group comprising a first lens and a second lens; a second lens group having a positive refractive power and comprising a third lens, a fourth lens and a fifth lens; a third lens group having a negative refractive power and comprising a sixth lens; and a fourth lens group having a positive refractive power and comprising a seventh lens and an eighth lens. At least one of the first lens to the eighth lens is an aspheric lens. By changing positions of at least two lens groups in the second lens group, the third lens group and the fourth lens group on the optical axis, the zoom lens assembly switches between a wide-angle state and a telephoto state, and a focal length of the zoom lens assembly changes linearly when the zoom lens assembly switches from the wide-angle state to the telephoto state.

A lens barrel for providing a compact lens barrel capable of suppressing ghosts and flares includes a first lens holding portion that holds a first lens; and a second lens holding portion that holds a second lens disposed further toward an image plane side than the first lens, wherein the outer diameter of the first lens is larger than the outer diameter of the second lens, wherein a plurality of through-holes along the optical axis direction of the first lens and the second lens is provided in the second lens holding portion, and wherein the first lens holding portion includes a plurality of protrusions arranged so as to overlap the plurality of through-holes if viewed from an object side along the optical axis direction.

A lens apparatus that can secure a necessary lens moving distance while avoiding growing in size and that is able to firmly hold a lens. The lens apparatus comprises a first lens group holding member, a second lens group holding member, an exterior cylinder disposed on an outer peripheral side of the first lens group holding member, a first cam cylinder disposed to be rotatable around an optical axis and movable in an optical axis direction corresponding to a rotation angle, a guide cylinder having a diameter fitting portion rotatably holding the first cam cylinder around the optical axis, and a second cam cylinder. The exterior cylinder does not have a cam groove or a guide groove for guiding another member, and is driven to a position at which part of the exterior cylinder is exposed to an outside corresponding to a rotation angle of the second cam cylinder.

An image lens assembly includes, in order from an object side to an image side along an optical path, a first lens group, a second lens group, a third lens group and a fourth lens group. A total number of lens elements in the image lens assembly is seven. The first lens group includes a first lens element with positive refractive power and a second lens element with negative refractive power. Each of the second lens group and the third lens group includes at least one lens element. The fourth lens group includes a seventh lens element. When the image lens assembly is focusing or zooming, a relative position between the first lens group and an image surface is fixed, a relative position between the fourth lens group and the image surface is fixed, and the second lens group and the third lens group move along the optical axis.

A lens module includes a base, a movable lens group, a magnet portion and a coil portion. The movable lens group is movable in a first direction and has an optical axis in parallel to the first direction. The magnet portion is disposed on one of the base and the movable lens group. The coil portion is disposed on the other of the base and the movable lens group and is disposed corresponding to the magnet portion.

The present disclosure discloses a zoom lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens group having refractive power; a second lens group having negative refractive power; a third lens group having refractive power; and a fourth lens group having refractive power. The zoom lens assembly may be continuously zoomed by changing positions of the second lens group and the third lens group along the optical axis. A total effective focal length ft of the zoom lens assembly in a telephoto state, and a total effective focal length fw of the zoom lens assembly in a wide-angle state satisfy: 1.3<ft/fw<3.3.

The present disclosure discloses a zoom lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens group having refractive power; a second lens group having negative refractive power; a third lens group having refractive power; and a fourth lens group having refractive power. The zoom lens assembly may be continuously zoomed by changing positions of the second lens group and the third lens group along the optical axis. A total effective focal length ft of the zoom lens assembly in a telephoto state, and a total effective focal length fw of the zoom lens assembly in a wide-angle state satisfy: 1.3<ft/fw<3.3.

A zoom lens group, sequentially from an object side to an image side along an optical axis, including a first lens group; a second lens group; a third lens group having positive refractive power; and a fourth lens group having negative refractive power. The zoom lens group continuously zooms by changing positions of the second lens group, the third lens group, and the fourth lens group along the optical axis. A distance TTL from an object-side surface of a lens in the first lens group closest to the object side to an imaging plane of the zoom lens group along the optical axis, and a total effective focal length fw of the zoom lens group in a wide-angle state satisfy: 2.0<TTL/fw<3.0.

A zoom lens group, sequentially from an object side to an image side along an optical axis, including a first lens group; a second lens group; a third lens group having positive refractive power; and a fourth lens group having negative refractive power. The zoom lens group continuously zooms by changing positions of the second lens group, the third lens group, and the fourth lens group along the optical axis. A distance TTL from an object-side surface of a lens in the first lens group closest to the object side to an imaging plane of the zoom lens group along the optical axis, and a total effective focal length fw of the zoom lens group in a wide-angle state satisfy: 2.0<TTL/fw<3.0.