Provided is an image pickup apparatus that can determine a step-out with a high approximation accuracy and then return a lens position to an initial position. The image pickup apparatus includes: an optical element that is movable with respect to a predetermined initial position; acceleration detection means that detects a shock applied to a body of the apparatus and outputs a vector of the shock; and control means that adds up an optical axis direction component of the optical element in the vector of the shock each time the shock is detected and, when a cumulative shock that is a result of adding up exceeds a predetermined threshold, determines that the optical element has stepped out and returns the optical element to the initial position.

Provided is an image pickup apparatus that can determine a step-out with a high approximation accuracy and then return a lens position to an initial position. The image pickup apparatus includes: an optical element that is movable with respect to a predetermined initial position; acceleration detection means that detects a shock applied to a body of the apparatus and outputs a vector of the shock; and control means that adds up an optical axis direction component of the optical element in the vector of the shock each time the shock is detected and, when a cumulative shock that is a result of adding up exceeds a predetermined threshold, determines that the optical element has stepped out and returns the optical element to the initial position.

A zoom system includes a collection optic L1 and a reflective Fresnel Lens L2 having a variable focal length. The reflective Fresnel Lens L2 is implemented with a MEMS MMA in which the mirrors tip, tilt and piston form and alter the reflective Fresnel Lens to focus light at a common focal point to set the variable focal length f2, hence the magnification M. In different embodiments, the zoom system may be configured to be “focal” or “afocal”. In the focal system, both L1 and L2 are fixed such that the system affects the net convergence or divergence of the magnified beam. In an afocal system, a mechanism is used to translate L2 to maintain a separation between L1 and L2 of d=f1+f2 as f2 is varied to change the magnification M.

The present invention relates to a lens (1) having an adjustable optical power, wherein the lens (1) comprises a container (2), wherein the container (2) comprises: a lens volume (V) filled with a transparent fluid (F1), a reservoir volume (R1) filled with the transparent fluid (F1) and connected to the lens volume (V), a frame structure (3) forming a lateral wall of the container (2), wherein the frame structure comprises a first recess (30) for accommodating at least a portion of the lens volume (V), and wherein the frame structure (3) comprises a second recess (31) for accommodating at least a portion of the reservoir volume (R1), an elastically deformable and transparent membrane (4) connected to the frame structure, a lens shaping element (5) connected to the membrane, wherein the lens shaping element (5) comprises a circumferential edge (50a) defining an area (4a) of the membrane (4) having an adjustable curvature, a transparent bottom wall (6) connected to the frame structure (3) so that the lens volume (V) is arranged between said area (4a) of the membrane (4) and said bottom wall, and an elastically deformable wall member (4b) adjacent the reservoir volume (R1).

An embodiment provides an imaging lens comprising first to third lens groups arranged sequentially from an object side to an image side and having refractive power, wherein the distances of the second lens group and the third lens group from the first lens group are variable such that a tele mode having a narrow angle of view and a wide mode having a wide angle of view can be implemented, the EFL in the tele mode is no more than 2.5 times the EFL in the wide mode, 2<F.sub.number<5 and 15 mm<TTL≤40 mm.

A 3D play system which includes a head-mounted/headset device. The head-mounted device includes a supporting structure, a first lens, and a second lens. The supporting structure is configured to support two display devices. The first lens is configured to zoom an image displayed by a first display device and project the zoomed image onto a left eye. The second lens is configured to zoom an image displayed by a second display device and project the zoomed image onto a right eye.

A 3D play system which includes a head-mounted/headset device. The head-mounted device includes a supporting structure, a first lens, and a second lens. The supporting structure is configured to support two display devices. The first lens is configured to zoom an image displayed by a first display device and project the zoomed image onto a left eye. The second lens is configured to zoom an image displayed by a second display device and project the zoomed image onto a right eye.

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).

Disclosed herein are embodiments of a porous aluminum oxide thin film having a surface RMS roughness value of less than 1 nm. The thin film may also comprise phosphorus. The disclosed thin films may have a refractive index of from 1 to 2, such as from 1 to 1.5. Also disclosed are embodiments of as method for making the disclosed thin films, comprising forming an aqueous solution of the alumina precursor, a surfactant and optionally a phosphorus-containing precursor, and depositing the solution on a substrate.

The present invention relates to an optical device (1), comprising a lens (10) having an adjustable focal length, the lens (10) comprising a container (11) that encloses a lens volume (V) and a reservoir volume (R) that is connected to the lens volume (V), wherein the two volumes (R, V) are filled with a transparent liquid (L), wherein the container (11) further comprises a flat lateral wall structure (12) having a front side (12a) and a back side (12b), an elastically deformable and transparent membrane (20), a transparent cover element (30), and an elastically deformable wall portion (22), wherein the membrane (20) is connected to the back side (12b) of the lateral wall structure (12), wherein the cover element (30) is connected to the front side (12a) of the lateral wall structure (12) such that the lens volume (V) is arranged between the cover element (30) and the membrane (20), and wherein the wall portion (22) is arranged adjacent the reservoir volume (R), and wherein the wall portion (R) comprises an inside (22a) and an outside (22b) facing away from said inside (22a), wherein the inside (22a) contacts the liquid (L) residing in the reservoir volume (R), and wherein the lens (10) further comprises a lens shaper (40) that is connected to the membrane (20) and defines an area (21) of the membrane (20), which area (21) has an adjustable curvature and contacts the liquid (L) in the lens volume (V), and wherein the lens (10) further comprises a movable piston (50) connected to the outside (22b) of the wall portion (22) and configured to act on said outside (22b) to pump liquid (L) from the reservoir volume (R) into the lens volume (V) or from the lens volume (V) into the reservoir volume (R) so as to change the curvature of said area (21) of the membrane (20) and therewith the focal length of the lens (10).