Abstract: A cloaking device includes an object-side, an image-side and a cloaked region between the object side and image-side. An object-side half lens, an image-side half lens and a planar reflection boundary positioned between the object-side half lens and the image-side half lens are included. The object-side half lens and the image-side half lens each comprise an inward facing surface and an outward facing convex surface. The planar reflection boundary comprises an inward facing mirror surface. Light from an object positioned on the object-side of the cloaking device and obscured by the cloaked region is redirected around the cloaked region by the object-side half lens, planar reflection boundary and image-side half lens to form an image of the object on the image-side of the cloaking device such that the light from the object appears to pass through the cloaked region.

Abstract: A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ration (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.

Abstract: An imaging device with a short length and small aberration is provided. A total length D of an image-forming optical system is less than 3.6 mm. A maximum incidence angle of a principle ray on an image forming plane exceeds 33°. Conditions f/fL<?1.50 or f/fL<?0.9, and D/f<1.10 are satisfied where f denotes a focal length of the entire image-forming optical system and fL denotes a focal length of a last lens.

Abstract: Ring-field, catoptric and catadioptric, unit-magnification, projection optical systems having non-concentric optical surfaces are disclosed. Each system has a system axis with object and image planes on opposite sides of the system axis. The non-concentric surfaces allow for working distances of the object and image planes in excess of 100 millimeters to be achieved, with a ring-field width sufficient to allow a rectangular object-field having a long dimension in excess of 100 mm to be projected.

Abstract: A prism type of lens includes a first reflection lens, at least a first lens group, a second reflection prism, at least a second lens group, a third reflection prism, and at least a third lens group sequentially arranged from an object side to an image side. Light is reflected by the reflection prisms to form a bent light axis. Therefore, the optical axis has three sections for the lens groups to move respectively. The bent light axis has a longer distance that the lens of the present invention may have a great zoom range.

Abstract: A disclosed projection optical system for projecting and forming an enlarged image of an image displayed in a planar manner as an object includes: a lens system including, from an object side, at least a lens group providing telecentricity to an object space side, a lens group controlling divergence of angles of view, a diaphragm, a lens group converging the angles of view, and a lens group converging and subsequently enlarging the angles of view; and a catoptric system disposed on an image side relative to the lens system and including a mirror having negative power. Each lens group of the lens system and the mirror having negative power share an optical axis and the optical axis is shifted relative to a center of an object surface.

Abstract: A variable magnification optical system of the present invention for forming an optical image of an object on a light-receiving surface of an image sensor with variable magnification includes: from the object side, at least a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The variable magnification is performed by movement of at least the first lens unit and the third lens unit. A bending optical element for bending an optical axis is provided between the second lens unit and the third lens unit. Moreover, prescribed conditional formulae are fulfilled.

Abstract: A zoom lens comprises in a direction of light propagation a front lens group (G1) having positive refractive power, a variator lens group (G2) having negative refractive power, a compensator lens group (G3) having positive refractive power, and a base lens group (G4) having positive refractive power. The base lens group (G4) comprises a first base lens group (G4.1) and a second base lens group (G4.2). The front lens group (G1), the variator lens group (G2), the compensator lens group (G3) and the first base lens group (G4.1) are arranged along a common straight first optical axis (23). The second base lens group (G4.2) is arranged along a second optical axis 23?) inclined with respect to the first optical axis (23) at a first angle ? different from 0° and 180°. A beam deflector (18) is arranged between the first base lens group (G4.1) and the second base lens group (G4.2).

Abstract: A projection objective includes a first lens group (G1) of positive refractive power, a second lens group (G2) of negative refractive power and at least one further lens group of positive refractive power in which a diaphragm is mounted. The first lens group (G1) includes exclusively lenses of positive refractive power. The number of lenses of positive refractive power (L101 to L103; L201, L202) of the first lens group (G1) is less than the number of lenses of positive refractive power (L116 to L119; L215 to L217) which are mounted forward of the diaphragm of the further lens group (G5).

Abstract: An anti-aliasing aperture and method of using the same is disclosed. In one embodiment, an anti-aliasing method includes passing light through an aperture stop, and diffracting the light passing through the aperture stop for spreading an image of a point object to cover more than a pixel on a detector array. The aperture stop includes two or more apertures. In another embodiment, an anti-aliasing apparatus includes an aperture stop having two or more apertures to diffract light passing therethrough and provide spreading of an image of a point object to cover more than one pixel on a detector array.

Abstract: A zoom lens system that is free from parallax, is compact, and offers excellent optical performance has, from the object side, a positive first lens unit, a negative second lens unit, a positive third lens unit, and a negative fourth lens unit. The zoom lens system has a half-prism between the second lens unit and the third lens unit so that a light beam having passed through the second lens unit is split by reflection.

Abstract: An albada finder comprising an objective lens group, which includes two negative lenses, and an eyepiece lens group, which includes two positive lenses, arranged in this order from the object side. A view frame is formed on the object side surface of the eyepiece lens group, and a half mirror is formed on the eye point side surface of the objective lens group. The finder satisfies the following condition:LD/lf.gtoreq.2 (1)wherein,LD is the lens full length (distance from the 1st surface to the 8th surface), andLf is the eye relief (distance from the 8th surface to an eye point).