Abstract: An optical system includes first and second lens units configured to move to have a component of direction perpendicular to an optical axis, in which a sign of an amount of movement of the lens units is defined as negative for a moving direction of the first lens unit and as positive for an opposite direction to the moving direction of the first lens unit, a product of an amount of movement and a focal length of the first lens unit and a product of an amount of movement and a focal length of the second lens unit are different from each other in sign, and Petzval sums of the first and second lens unit, a focal length of the optical system, and a back focus of the optical system are set.

Abstract: An imaging lens which uses a larger number of constituent lenses for higher performance and features compactness and a wide field of view. The imaging lens is composed of seven lenses to form an image of an object on a solid-state image sensor. The constituent lenses are arranged in the following order from an object side to an image side: a first lens with positive refractive power; a second lens with positive or negative refractive power; a third lens with negative refractive power; a fourth lens with positive or negative refractive power as a double-sided aspheric lens; a meniscus fifth lens having a convex surface on the image side; a sixth lens with positive or negative refractive power as a double-sided aspheric lens; and a seventh lens with negative refractive power, in which an air gap is provided between lenses.

Abstract: An optical system with a fixed focal length includes a front lens unit closest to an object, a rear lens unit having a negative refractive power closest to an image plane, and a middle unit having a positive refractive power as a whole, including one or more lens units, and disposed between the front lens unit and the rear lens unit. A distance between adjacent lens units changes during focusing. The rear lens unit includes two or more positive lenses. A predetermined condition is satisfied.

Abstract: Disclosed is a camera optical lens. including, nine lenses from an object side to an image side being: a first lens with a negative refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens all with a positive refractive power, a seventh lens with a negative refractive power, an eighth lens with a positive refractive power and an ninth lens with a negative refractive power. The camera optical lens satisfies: ?1.60?f1/f??0.50, 2.50?d3/d4?10.00; wherein, f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, d3 denotes an on-axis thickness of the second lens, and d4 denotes an on-axis distance from the second lens to the third lens. The camera optical lens has good optical performance, and meets the design requirements of wide-angle and ultra-thin.

Abstract: An optical unit includes a first barrel, a second barrel, a third barrel, and a position detection unit. Eight magnets including first and second magnets are fixed to the first barrel. A first and second coils are fixed to the second barrel. The position detection unit includes a magnetic sensor configured to detect magnetic fields generated by the first and second magnets and to generate a detection signal having a corresponding relation with a position of the first barrel. The third barrel includes a position defining surface parallel to a moving direction of the first barrel. The position detection unit is fixed to the position defining surface.

Abstract: A lens assembly includes a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, and a first reflective element. The first and third lens groups are with negative refractive power. The second and fourth lens groups are with positive refractive power. The fifth and sixth lens groups are with refractive power. The first, second, third, fourth, fifth, and sixth lens groups are arranged in order from a first side to a second side along an axis. The first reflective element includes a first reflective surface. A light from the first side sequentially passes through the first, second, third, fourth, fifth, and sixth lens groups to the second side. The first reflective element is disposed between the first lens group and the sixth lens group.

Abstract: A surgical loupes head strap is disclosed. The surgical loupes head strap may include a first monofilament and a second monofilament coupled by at least one sleeve. The surgical loupes head strap may further include a first coupler with a first hole and a second hole, where the first hole is configured to surround and couple to a first end of the first monofilament, and the second hole is configured to surround and couple to at least a portion of a first surgical loupes headgear temple. The surgical loupes head strap may further include a second coupler with a first hole and a second hole, where the first hole is configured to surround and couple to a first end of the second monofilament, and the second hole is configured to surround and couple to at least a portion of a second surgical loupes headgear temple.

Abstract: An optical imaging system includes a first lens group, a second lens group, and a third lens group, sequentially arranged from an object side, wherein the first lens group includes two lenses having negative and positive refractive power, the second lens group includes a plurality of lenses, and the third lens group includes two lenses having negative and positive refractive power.

Abstract: A photographing optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element has an object-side surface being convex in a paraxial region thereof.

Abstract: An optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens includes an object-side surface that is convex with a meniscus shape. The second lens includes an image-side surface that is convex. The third lens includes an image-side surface that is concave. The fifth lens includes an image-side surface that is concave. The first to sixth lenses are sequentially disposed from an object side to an image side.

Abstract: Earpiece-less glasses including an interchangeable left eye frame, an interchangeable right eye frame and a nose piece connecting the left eye frame to the right eye frame. The left eye frame and the right eye frame each provide eye lens pockets configured to hold and snuggly fit a respective first eye lens in the respective pockets. The left eye frame and the right eye frame each provide an opening to the pockets so that the first lenses can be replaced with second lenses. A magnification strength of the first lenses may be different from the magnification strength of the second lenses.

Abstract: A head-mounted display may include a display system and an optical system in a housing. The display system may have displays that produce images. Positioners may be used to move the displays relative to the eye positions of a user's eyes. An adjustable optical system may include tunable lenses such as tunable cylindrical liquid crystal lenses. The displays may be viewed through the lenses when the user's eyes are at the eye positions. A sensor may be incorporated into the head-mounted display to measure refractive errors in the user's eyes. The sensor may include waveguides and volume holograms, and a camera for gathering light that has reflected from the retinas of the user's eyes. Viewing comfort may be enhanced by adjusting display positions relative to the eye positions and/or by adjusting lens settings based on the content being presented on the display and/or measured refractive errors.

Abstract: 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.

Abstract: An imaging lens system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, and a sixth lens having a positive refractive power. The F number of the system is 2.0 or less. The following Conditional Expression is satisfied: OAL/(Img HT)<1.50. In the expression, OAL represents a distance from an object-side surface of the first lens to an imaging plane, and Img HT represents a half of a diagonal length of the imaging plane.

Abstract: An optical system is provided. The optical system includes a fixed portion and a movable portion. The movable portion is movable relative to the fixed portion and includes: a first movable portion and a second movable portion. The first movable portion is configured to connect a first optical element. The second movable portion is configured to connect a second optical element and is movable relative to the first movable portion. The movable portion also includes a third optical element disposed corresponding to the first optical element and the second optical element. Light passes through the first optical element, the second optical element and the third optical element.

Abstract: A system is provided. The system includes a first PVH layer configured to deflect a first polarized light having a first handedness. The system includes a second PVH layer coupled to the first PVH layer and configured to deflect a second polarized light having a second handedness opposite to the first handedness. The system includes an optical sensor configured to generate a first image based on the first polarized light deflected by the first PVH layer and generate a second image based on the second polarized light deflected by the second PVH layer.

Abstract: An optical element drive mechanism is provided. The optical element drive mechanism includes an immovable part, a first movable part, a first drive assembly, and a guidance assembly. The first movable part is movable relative to the immovable part. The first movable part is connected to a first optical element. The first drive assembly drives the first movable part to move relative to the immovable part. The guidance assembly guides the movement of the first movable part in the first dimension.

Abstract: A zoom lens according to the present invention includes, in order from an object side to an image side, first to third lens units with positive, negative and positive refractive powers, and a rear group including two or more lens units, in which an interval between adjacent lens units is varied during zooming. The zoom lens includes a correction lens unit which has a function of moving an imaging position in a direction perpendicular to an optical axis. The correction lens unit includes, in order from the object side to the image side, a positive first subunit, a positive second subunit which moves in a direction having a component of the direction perpendicular to the optical axis, and a negative third subunit. Focal lengths of the zoom lens when focused at infinity at a wide angle end and the correction lens unit are appropriately set.

Abstract: A pair of temple-less glasses to allow the user to have unrestricted access to their face while still being able to maintain having their glasses, equipped with a prescription, in place. The temple-less glasses have a first eye unit and a second eye unit connected to a nose piece by way of an attachment mechanism. The attachment mechanism is present on both the first eye unit and the second eye unit. The attachment mechanism functions by slidably attaching the attachment element of each eye unit to an attachment bar located on the outer left and right edge of the nose piece.

Abstract: An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, and a second lens unit having a positive refractive power. An interval between the first lens unit and the second lens unit changes during focusing. The second lens unit includes, in order from the object side to the image side, a first subunit having a positive refractive power, an aperture stop, and a second subunit having a positive refractive power. A predetermined condition is satisfied.