Abstract: If an intraocular lens is inserted in an eye to be examined, characteristics of the eye to be examined are measured after increasing light intensity of visible light projected onto the eye to be examined to be higher than light intensity at the time of measurement of an eye to be examined in which no intraocular lens is inserted.

Abstract: In a zoom lens system, an optical apparatus, and a manufacturing method, there are provided, in order from an object side: a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having negative power, a fifth group having positive power, and an aperture stop disposed to an image side of the second lens group. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens and second lens groups increases, a distance between the second and third lens groups decreases, a distance between the third and fourth lens groups varies, and a distance between the fourth and fifth lens groups varies. With given conditions being satisfied, high optical performance with suppressing variation in aberrations are achieved.

Abstract: An illumination system includes a light source arranged for emitting non-collimated light towards a reflective surface of a scanning mirror assembly such that the light source occludes a region of the light reflected from the reflective surface. The scanning mirror assembly includes the reflective surface, which is arranged to be rotationally displaced around at least one rotation axis. The illumination system also includes an optical element for changing the propagation direction of the said reflected light so as to illuminate at least a part of the said occluded region.

Abstract: A beam splitting system for laser ranging includes a roof half-pentaprism, an isosceles prism and a compensating prism. Due to different compensating prisms, there are four light splitting combinations in total. Light of a certain wavelength is incident from one side of the roof half-pentaprism, and is reflected therein for several times and finally emergent into the isosceles prism where it is reflected for several times and finally emergent in a direction consistent with an incident light axis. Light of another wavelength is incident from one side of the compensating prism, and finally emergent from one side of the roof half-pentaprism or one side of the isosceles prism. Different light splitting ways may be caused due to different positions of both prisms and data LCDs. A number of different optical ranging systems will be provided if a laser rangefinder employs different light splitting combinations.

Abstract: A combiner positioning system for a head-up display includes a carrier and a locking element. The carrier supports a combiner for the head-up display, and the combiner is movable between a stowed position and a display position. The locking element has an engaged position and a disengaged position. The locking element engages a portion of the carrier in the display position and rigidly holds the carrier in the display position.

Abstract: A display displays a composite image including element pixels. Each element pixel is formed by arranging, in a direction, pixels respectively extracted from images having different viewpoints. A first optical element includes lenses arrayed in the direction to correspond to the element pixels and emits in parallel light rays emitted from pixels respectively included in the element pixels, for a particular image. A second optical element condenses the light rays. An output circuit selects a pixel of the particular image which is included in a particular element pixel and outputs its pixel value to the display. At this time, a pixel more distant from an optical axis of the second optical element along the direction in the particular image is selected as a distance between the first and second optical elements becomes smaller than a focal length of the second optical element.

Abstract: An optical imaging lens includes, in order from an object side to an image side, first, second, third, fourth, fifth, sixth, and seventh lens elements arranged along an optical axis. The object-side surface of the first lens element has a convex portion and the image-side surface has a concave portion. The image-side of the third lens element is a concave surface. The object-side surface of the fourth lens element has a concave portion and the image-side surface of the fourth lens element has a convex portion. The image-side surface of the sixth lens element has a convex portion. The object-side surface of the seventh lens element has a convex portion and the image-side surface has a convex portion. The optical imaging lens only has seven lens elements having a refractive power.

Abstract: An auto stereo display system for subway tunnel is disclosed. When a train is traveling through the tunnel at high speed, passengers can see stereo images outside the window by the system. The system is composed of LED light columns that vertically aligned at equal distance on the tunnel wall. Each LED light column is composed of multiple columns of LEDs and slit gratings. When the LEDs are changing with the changing instant speed of multi viewing angle image pixel array and the train, the passengers can see stereo image without glasses. The display system is specially applicable for business advertisement and nonprofit propagation in subway tunnel.

Abstract: Disclosed are a diffractive optical element and a measurement device that are capable of reliably suppressing occurrence of a zero-order diffracted light beam and generating light spots in a wide range. The diffractive optical element has concave and convex portions and diffracts incident light in two dimensions to generate diffracted light. When a maximum diffraction angle with reference to an optical axis of the incident light is an angle range ?, the angle range ? is 7.5° or greater, and diffraction efficiency in a zero-order diffracted light beam is 5% or less.

Abstract: A method for manufacturing Q-switches includes coating a first Z-surface and second Z-surface of an oriented slab of a chemically reducible electro-optic lithium compound crystal (LC slab) with a condensed material including an active chemical operable once activated to chemically reduce the LC. The LC slab with condensed material thereon is heated in a non-oxidizing atmosphere at a temperature above an activating temperature of the condensed material. The LC slab is cooled to a temperature below a quenching temperature below which re-oxidization of the LN slab is inhibited. A finishing process is performed including cutting the LC slab of LC into a plurality of Q-switch devices each having a chemically reduced LC substrate, and forming metal electrodes on opposing sides of the LC substrates that are orthogonal to the Z-surfaces, and coating the Z-surfaces with an antireflective (AR) coating material.

Abstract: A zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, a fifth lens unit having a positive refractive power, and an aperture stop disposed between the second lens unit and the third lens unit. At the time of zooming, the aperture stop moves and the fifth lens unit is fixed. At the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, a distance between the third lens unit and the fourth lens unit fluctuates, and a distance between the fourth lens unit and the fifth lens unit fluctuates.

Abstract: An F-theta objective is provided that has five individual lenses with a first individual lens as biconcave lens with a focal length, a second individual lens as meniscus with a focal length, a third individual lens as meniscus with a focal length, a fourth individual lens as a biconvex lens with a focal length and a fifth individual lens as a plano-convex lens with a focal length and a total focal length f of the F-theta objective. A ratio between the focal lengths to the total focal length satisfies predetermined conditions.

Abstract: An autostereoscopic display apparatus may include a stepped waveguide, optical elements, and one or more reflective imaging and/or directional elements. These elements may be arranged to return light from the stepped waveguide into an array of viewing windows. Such elements can be used to achieve observer tracking autostereoscopic display for landscape and portrait modes of operation. System thickness and cost may be reduced and system brightness can be increased or low operating power modes may be achieved.

Abstract: There are provided a subminiature optical system having a miniature size and capable of obtaining a narrow view angle using only five sheets of lenses, and a portable device having the same. The subminiature optical system includes a first lens convex toward the object side and having positive refractive power. a second lens concave toward an image side and having negative refractive power, a third lens convex toward the object side and having positive refractive power, a fourth lens concave toward the image plane and having negative refractive power, and a fifth lens convex toward the image plane and having negative or positive refractive power, sequentially from an object side.

Abstract: An optical cloaking system which optically cloaks/hides an object in the visible light spectrum such that the object appears invisible, while permitting a background behind the object to be viewed substantially without distortion. The system includes at least one optical device manufactured using common optical materials in the form of prisms, lenses, mirrors, and the like, which is placed between an observer an the object to be cloaked, and the optical device bends and/or compresses light such that the light passes around a cloaked space in which an object is disposed, and the observer viewing a larger space including the cloaked space will not see the object, but will see a background behind the object in full view substantially undistorted in relation to the rest of the larger space.

Abstract: An optical imaging lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprising: the first lens element with positive refractive power, the second lens element with negative refractive power having a convex object-side surface and a concave image-side surface, the third lens element with positive refractive power, the fourth lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the fifth lens element with refractive power having a concave image-side surface, and both object-side surface and image-side surface being aspheric, wherein a stop and an image sensor disposed on an image plane are also provided. By such arrangements, the image pickup optical system satisfies conditions related to shorten the total length and to reduce the sensitivity for use in compact cameras and mobile phones with camera functionalities.

Abstract: An eyepiece for a head wearable display includes a light guide component for guiding display light received at a peripheral location offset from a viewing region and emitting the display light along an eye-ward direction in the viewing region. The light guide component includes an input surface to receive the display light into the light guide component, an eye-ward facing side, a world facing side, a total internal reflection (“TIR”) portion disposed proximal to the input surface to guide the display light received through the input surface using TIR, and a partially reflective portion including a partially reflective element disposed over the eye-ward facing side and a switchable reflector disposed over the world facing side. The partially reflective portion is disposed to receive the display light from the TIR portion and to guide the display light via reflections off of the partially reflective element and the switchable reflector.

Abstract: This invention is for a flexible telescope mirror. A mirrored film is stretched across a frame, and deformed into a rough parabola using a partial vacuum. The film is then deformed into a more perfect parabola using electric fields. In some embodiments, a feedback system based on a laser projector and a camera is used to fine tune the resulting parabola for optical performance. The invention allows the creation of large telescope mirrors for a substantially lower price than conventional ground glass mirrors, and allows the creation of substantially lighter mirrors, suitable for space-based applications.

Abstract: Contact lens designs are provided with improved stabilization wherein the moments of momentum are balanced.

Abstract: An imaging lens includes a first lens; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The first lens has a surface thereof on the object side having a positive curvature radius. The second lens has surfaces on the object side and the image plane side having positive curvature radii. The third lens has a surface on the object side having a positive curvature radius and a surface on the image plane side having a negative curvature radius. The fifth lens is formed has an aspheric shape surface on the object side. The sixth lens has an aspheric shape surface on the image plane side. The first to fourth lenses have refractive power weaker than that of the fifth and sixth lenses.