Abstract: An optical imaging system is provided. The optical imaging system has a first lens, a second lens, a third lens, and a fourth lens disposed in order from an object-side to an image-side. The optical imaging system satisfies the following conditional expressions: F No.?1.5, 0.5<EPD/TTL<0.7, where EPD is an entrance pupil diameter, and TTL is a distance from an object-side surface of the first lens to an imaging plane.

Abstract: A liquid lens can include two or more liquids enclosed in a chamber. The liquid lens can be configured to reduce the chromatic aberration produced when the meniscus formed at the interface of two of the liquids is tilted. This can be accomplished in a number of ways including selecting the liquids to maximize the refractive index difference and minimize the Abbe number difference.

Abstract: There is provided an imaging lens with high-resolution which realizes the wide field of view, low-profileness, and low F-value in well balance, and proper correction of aberrations. An imaging lens comprising in order from an object side to an image side, a first lens having a convex surface facing the object side near an optical axis and negative refractive power, a second lens having negative refractive power, a third lens, a fourth lens having biconvex shape near the optical axis, and a fifth lens, wherein each lens of the first lens to the fifth lens is arranged without being cemented, and a below conditional expression (1) is satisfied: 0.50<r5/r6<12.50??(1) where r5: curvature radius of the object-side surface of the third lens, and r6: curvature radius of the image-side surface of the third lens.

Abstract: A plastic barrel includes an object-end portion, an image-end portion, an inner tube portion and a plurality of protrusions. The object-end portion includes an outer object-end surface, an object-end hole and an inner annular object-end surface. One side of the inner annular object-end surface is connected to the outer object-end surface and surrounds the object-end hole. The image-end portion includes an outer image-end surface, an image-end opening and an inner annular image-end surface. The inner annular image-end surface is connected to the outer image-end surface and surrounds the image-end opening. The inner tube portion connects the object-end portion and the image-end portion and includes a plurality of inclined surfaces. The protrusions are disposed at least on one of the inner annular object-end surface, the inner annular image-end surface and the inclined surfaces, wherein the protrusions are regularly arranged around the central axis of the plastic barrel.

Abstract: A mirror support includes a first rod in which one end is connected to an arm at a position closer to a side of a first pad fixed to the mirror with respect to a second pad fixed to the mirror while the other end stretched and inclined onto the side of first pad from the position connected is connected to a support structure; a first-rod elastic body that is an elastic body constituting the first rod; a second rod in which one end is connected to arm at a position closer to a side of second pad with respect to first pad while the other end stretched and inclined onto the side of second pad from the position connected is connected to the support structure; and a second-rod elastic body that is an elastic body constituting the second rod.

Abstract: A camera accessory mounting element includes attachment elements configured to mount to a component of a camera, such as a lens or a flash device. One or more peripheral devices may be attached to the camera accessory mounting element using attachment elements such as magnets. Peripheral devices include a grid, a light directing dish, a lens hood, a lens adaptor, a step-ring, a lens filter, a lens extension tubes, a light diffusers, a light filter, and a light directing device.

Abstract: A lens apparatus includes a plurality of lens holders, a first cam barrel, a second cam barrel, and a third cam barrel each having a cam groove configured to move at least one of the plurality of lens holders in an optical axis direction. The first cam barrel is located outside the second cam barrel and the third cam barrel, and the second cam barrel is located outside the third cam barrel. A predetermined condition is satisfied.

Abstract: An objective includes the first and second groups. The first group includes the first cemented lens with a concave surface facing the object side, the first and second single lenses having positive power, and the second cemented lens with a concave surface facing an image side. The second group includes the third cemented lens with a concave surface facing the object side and a third single lens having positive power. Each of the cemented lenses combines one positive lens with one negative lens. The objective satisfies the following expressions. 0.31?NA<1??(1) 2.2?H/f?3.3??(2) 0<a/b?1.2??(3) Here, NA is a numerical aperture, f is a focal length at e-line, H is a distance from an object surface to a lens surface closest to an image, a is the sum of air-gap distances in the first group, and b is a thickness of a negative lens in the second cemented lens.

Abstract: Designs of display devices using an integrated lens are described. According to one aspect of the present invention, an integrated lens includes at least one planar lens and at least one liquid lens. The planar lens includes at least a substrate and a plurality of nanosized studs while the liquid lens includes a liquid layer (e.g., liquid crystals) and two (electrodes sandwiching the liquid layer. Depending on the implementation, the studs may be in different heights, spaced evenly or unevenly and oriented towards or outwards a focal point. One of the two electrodes is patterned per a predefined pattern to have an array of small electrodes. Together with another one of the two electrodes and the planar lens, the affected electric field applied across the liquid layer achieves desired optical characteristics to allow a viewer a media advantageously through the integrated lens.

Abstract: A method of producing freeform lenses for a PSP laser line system having a laser line diode and a set of three freeform lenses aligned along an optical alignment axis, the set of freeform lenses configured to yield a resultant laser line, the method including: (a) calculating lens surfaces for a lens form to fabricate a lens of the lens set therefrom; (b) fabricating a plurality of slices of the lens form, the plurality of slices distributed over a width “SW” of the lens, wherein each the slices has a width dimension “SL”; (c) aligning and constraining together the plurality of slices to fabricate the lens form, and molding a lens using the fabricated lens form; (d) repeating steps (a) to (c) to produce all three lenses of the set of lenses; and (e) integrating the produced lens set into the laser line system; the resultant laser line having a length “L” and a width “W” and a power uniformity evaluated along L.

Abstract: Provided are an imaging device capable of assisting focusing without giving uncomfortable feeling, a focusing assistance method thereof, and a focusing assistance program thereof. In a case where manual focusing is assisted by moving an image sensor, a focus adjustment speed by an imaging lens is detected. In a case where the focus adjustment speed by the imaging lens is reduced to a threshold value or less, the assistance is started by moving the image sensor. At this time, a focusing assistance unit is brought into an in-focus state by controlling the movement of the image sensor such that the sum of the focus adjustment speed by the imaging lens and a focus adjustment speed by the movement of the image sensor is set to a speed equal to or less than the threshold value.

Abstract: A projection optical system is for an image projection device. The projection optical system includes a whole lens system of seven to nine lenses and an aperture stop. The seven to nine lenses are all single lenses. One negative lens and one or two positive lenses are located on a magnifying side with respect to the aperture stop. Two negative lenses and three or four positive lenses are located on a reducing side with respect to the aperture stop. A lens adjacent to the magnifying side of the aperture stop and a lens adjacent to the reducing side of the aperture stop are both a negative lens.

Abstract: The housing includes a plate-shaped base; and a cover provided with a bottom plate and a side plate, and covers a main surface of the base. The base has in the main surface, a wall part which extends along the peripheral edge of the main surface, and faces the side plate of the cover. The side plate having an opening exposing a portion of the wall part. An adhesive bonding the base and the cover together is provided in a gap between the wall part and the side plate. The cross-sectional area of the gap in a cross section orthogonal to at least one direction from the direction from the wall part exposed from the opening, to either end of the wall part in the length direction, and the direction from the height-direction end of the wall part exposed from the opening, to the main surface of the base, decreases in said at least one direction.

Abstract: An illuminator including a light source and an optical device is provided. The light source is configured to emit light. The optical device is configured to provide uniform illumination with at least one indicating mark after receiving light. The optical device includes a diffusing part and a directing part. The diffusing part is configured to provide uniform illumination. The directing part is configured to provide at least one indicating mark.

Abstract: A plastic barrel includes an object-end portion, an image-end portion, an inner tube portion and a plurality of protrusions. The object-end portion includes an outer object-end surface, an object-end hole and an inner annular object-end surface. One side of the inner annular object-end surface is connected to the outer object-end surface and surrounds the object-end hole. The image-end portion includes an outer image-end surface, an image-end opening and an inner annular image-end surface. The inner annular image-end surface is connected to the outer image-end surface and surrounds the image-end opening. The inner tube portion connects the object-end portion and the image-end portion and includes a plurality of inclined surfaces. The protrusions are disposed at least on one of the inner annular object-end surface, the inner annular image-end surface and the inclined surfaces, wherein the protrusions are regularly arranged around the central axis of the plastic barrel.

Abstract: Optics systems presented are arranged as high-performance imagers particularly characterized by their exceptional compactness in view of image quality. A plurality of lens and let's and or doublets are configured to cooperate with related mount systems optimized for compactness. To achieve very high resolution imaging despite somewhat abbreviated compound lens design, these systems include use of lens array elements proximate to an imaging plane. So placed lens array devices may be designed with lens elements which invariably operate on incident wave planes with radial dependence. That is, the focusing strength of lenses from which these lens arrays are comprised may depend upon its distance from system optic axis. This enables an imaging correction function that counters distortion and other undesirable imaging errors typically present in a simplified compound lens systems.

Abstract: Provided are a lens drive motor, a camera and a mobile terminal apparatus. The lens drive motor includes a housing, a lens support, a coil and a magnet component; the coil is wrapped around the lens support and is provided in the housing; the magnet component is provided between the housing and the lens support, wherein a portion, corresponding to the magnet component, of the housing is made of a first material, and other portions of the housing are made of a second material; and a magnetic conductivity of the second material is smaller than a magnetic conductivity of the first material. A problem of insufficient driving force of the lens drive motor in a related technology is solved by the present disclosure.

Abstract: A method to configure an optical device. The method may rely on an optical device that includes two parallel mirrors extending, each, parallel to a reference plane, and an active material extending between the mirrors. An average plane of the active material is parallel to said reference plane, so as to form an optical resonator. The active material is energized so as to non-volatilely alter a refractive index and/or an optical absorption in one or more regions of said material. This results in forming one or more cavities, respectively, in which light can be laterally confined, in-plane with said average plane, in addition to being confined between the mirrors, along a direction perpendicular to said reference plane. Each of the one or more cavities has an altered mode profile compared to a non-altered region of the active material. Related methods and optical devices are also disclosed.

Abstract: A lens barrel that is capable of miniaturizing and thinning an image pickup apparatus by enabling to switch manual lens drive and electric lens drive with a simple mechanism. A lens barrel is mounted on an image pickup apparatus that supports an operation member rotatably. A drive barrel engages with a lens holding member to drive it in an optical axis direction. A motor transfers rotation to the drive barrel through a transfer mechanism. A switching mechanism switches between electric lens drive that drives the lens holding member by transferring rotation of the motor to the drive barrel and manual lens drive that drives the lens holding member by transferring rotation of the operation member to the drive barrel via an elastic member that rotates together with the operation member according to a user's operation. The drive barrel engages with the elastic member while shifting to a photographing area.

Abstract: The present invention relates to an apparatus and a method for controlling auto focus of a camera module including a voice coil motor actuator. The camera module includes a sensing unit configured to sense a movement of the lens unit and a controller configured to control the movement of the lens unit based on a sensing signal sensed by the sensing unit. If an initial operation command is received, the controller moves the lens unit to an end point of a maximum movement range. If the lens unit is positioned at the end point of the maximum movement range, the controller compares the sensing signal sensed by the sensing unit with a predetermined reference signal to calculate a compensation value for an error. If a focus operation command is received, the controller can move the lens unit to a focus position based on the calculated compensation value and compensate for the focus position of the lens unit.