Abstract: A zoom lens including, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, an image side lens group having a positive refractive power, wherein the distance between the first lens group and the second lens group changes during zooming, a refractive optical element A, which has a positive refractive power when its object side surface and image side surface are exposed to air, is provided in the first lens group and located closest to the object side in the first lens group, and the refractive optical element A is cemented together with an optical element B. The Abbe constant ?d and the partial dispersion ratio ?gF of the refractive optical element A satisfies certain conditions.

Abstract: An image forming optical system includes in order from an object side to an image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and an image-side lens group having a positive refractive power. A distance between the first lens group and the second lens group changes at the time of zooming. A refractive optical element A having a positive refractive power is positioned in the first lens group. The image forming optical system satisfies the following conditional expression (1-1), conditional expression (1-2), and conditional expression (2). ?dA<30??(1-1) 0.54<?gFA<0.9??(1-2) |fG1/fG2|>6.4??(2).

Abstract: In an image pickup apparatus which includes a photoelectric conversion cell group in which, a plurality of photoelectric conversion cells which convert an optical image formed by an optical system to an electrical signal, are arranged two-dimensionally, at least some photoelectric conversion cells from among the plurality of photoelectric conversion cells are formed to output an image signal and a signal for ranging, and areas of a photoelectric conversion regions of photoelectric conversion cells which output the image signal, including the photoelectric conversion cells which output the image signal and the signal for ranging having the same spectral sensitivity of light received, in the photoelectric conversion cell group are substantially same, and the photoelectric conversion cells are arranged such that, for at least two photoelectric conversion cells which are necessary for ranging, a distance between centers of gravity of areas of the photoelectric conversion region of the photoelectric conversion cel

Abstract: At least some of the pixels on which color filters that give the largest weight to a brightness signal or color filters that have the highest transmittance among the plurality of color filters are provided are pixels for focus detection that are designed in such a way that the direction of incidence of light beams incident thereon is restricted, the pixels other than the pixels for focus detection are pixels for image picking-up that are designed in such a way that the degree of restriction placed on light beams incident thereon is smaller than that placed on light beams incident on the pixels for focus detection, the pixels for focus detection output at least a signal for ranging, the pixels for image picking-up output at least a signal for an image, and there are at least three pixels for focus detection in an area defined between a circle having its center at the center of any one of the pixels for focus detection and having a radius equal to 3.

Abstract: Provided is a newspaper production apparatus which can make the processing mechanisms after digital printing small-scaled and which can quite easily obtain a favorably stacked state of sheets. The newspaper production apparatus includes: a paper feeding unit which feeds a continuous paper; ink jet printing units; and a folding unit which cuts and folds the continuous paper after being printed. The folding unit is configured as a rotary folding unit provided with a folding cylinder including: a retaining mechanism which retains a sheet on an outer circumferential surface of the folding cylinder; and a folding blade mechanism which projects the retained sheet radially outward. The rotary folding unit is capable of collect run by which sheets retained by the retaining mechanism are folded at each plural number of turns of the folding cylinder.

Abstract: The invention provides a viewing optical system positioned between a viewing plane as a virtual plane and an eye point. The viewing optical system comprises, in order from the viewing plane side, a cemented lens in which at least one negative lens and at least one positive lens are cemented together and one positive lens, and satisfies the following condition (1). ?8<r3/f<?0.2??(1) Here r3 is the radius of curvature of the lens surface positioned in the cemented lens and nearest to the viewing plane side, and f is the focal length of the whole viewing optical system.

Abstract: A lens component of the present invention is made by cementing a lens LA and a lens LB having a refracting power smaller than a refracting power of the lens LA, and satisfies predetermined conditional expressions. Moreover, in an image forming optical system of the present invention which includes a lens group B having a negative refracting power, a lens group C having a positive refracting power and which moves only toward an object side at the time of zooming from a wide angle end to a telephoto end, and one or two more lens groups additionally, one of the lens components of the present invention is used in the lens group B.

Abstract: In a zoom lens, in which the distance between the first lens group and the second lens group changes during zooming, wherein a refractive optical element A that has a positive refracting power if its object side surface and its image side surface are interfaces with air is provided between an object side base optical element B and an image side base optical element C to constitute therewith a three-piece cemented optical element D in the first lens group, there is at least one optical element having a positive refracting power disposed closer to the object side than the three-piece cemented optical element D, and the zoom lens satisfies a certain condition.

Abstract: An imaging body (1) includes: an attachment/detachment portion (2) to which an imaging optical system (12) is detachably attached; an imaging element (3); and a conversion optical system (4). The conversion optical system (4) is constituted by front side lens systems (4a, 4b) and a rear side lens system (4c). The conversion optical system (4) forms an intermediate image between the attachment/detachment portion (2) and imaging element (3). A shutter (5) is provided near the intermediate image.

Abstract: An imaging body (1) includes: an attachment/detachment portion (2) to which an imaging optical system is detachably attached; an optical path division means (3); an imaging element (4); and a conversion optical system (5, 5?). The conversion optical system (5, 5?) is formed by a front lens system (5a, 5c, 5d) and a rear lens system (5b, 5e). The front lens system (5a, 5c, 5d) is disposed between the attachment/detachment portion (2) and the optical path division means (3). The rear lens system (5b, 5e) is disposed between the optical path division means (3) and the imaging element (4).

Abstract: An optical unit (1) includes a first attachment/detachment portion (2) to which an imaging optical system (31) is detachably attached, an optical path division means (3), a finder optical system (6), and a second attachment/detachment portion (4). An imaging unit includes a third attachment/detachment portion (11) disposed at a position corresponding to the second attachment/detachment portion (4) and an imaging element (12, 12?). An imaging body (20, 20?) includes the optical unit (1) and imaging unit (10, 10?) which are detachably attached to each other through the second and third attachment/detachment portions (4) and (11).

Abstract: There is provided a zoom lens with a wide angle of view at the wide angle end and a high zoom ratio that has good imaging performance throughout the entire zoom range with chromatic aberrations being corrected favorably.

Abstract: An optical system comprises, in order from the object side, an aperture stop, a first lens with positive refracting power, a second lens with negative refracting power, and a third lens, both surfaces of the third lens are an aspherical surface in which refracting power varies in accordance with distance from the optical axis in such a way that the both surfaces have a convex shape facing toward the object side in the vicinity of the optical axis and have a concave shape facing toward the object side in the vicinity of the outer circumference, and the following conditions (1) and (2) are satisfied: 2.2<d2/d3<7??(1) ?0.04<f/f3<0.04??(2) where d2 is the thickness of the first lens on the optical axis, d3 is a space distance between the first and second lenses on the optical axis, f is a focal length of the whole of the wide angle optical system, and f3 is a focal length of the third lens.

Abstract: An image pickup apparatus that comprises: an optical path splitting element; an optical system including a variable-optical-power element which is substantially immobile in an optical axis direction and a reflective surface; and an image pickup surface, the variable-optical-power element, the optical system, and the image pickup surface being arranged so that a ray from an object side is divided into two rays by the optical path splitting element, at least one of the rays enters the optical system, and is reflected by the reflective surface to return to the optical path splitting element, and the ray strikes on the image pickup surface via the optical path splitting element.

Abstract: An optical apparatus includes a variable optical-property element, a driving circuit driving the variable optical-property element, and an image sensor. In order to compensate a change of an imaging state caused by at least one factor of temperature, humidity, a manufacturing error, a change of an object distance, and a zoom state, photographing is performed while referring to a look-up table to change driving information provided to the variable optical-property element, and the driving information that the high-frequency component of a photographed image is practically maximized is assumed so that the variable optical-property element is driven by the driving information to perform photographing.

Abstract: A wide angle optical system is formed by, in order from the object side, an aperture stop, a first lens with positive refracting power, a second lens with negative refracting power, and a third lens. Both surfaces of the third lens are an aspherical surface in which refracting power varies in accordance with distance from the optical axis in such a way that the both surfaces have a convex shape facing toward the object side in the vicinity of the optical axis and have a concave shape facing toward the object side in the vicinity of the outer circumference, and the following conditions (1) and (2) are satisfied: 0.1<d5/d6<0.65??(1) ?0.04<f/f3<0.04??(2) where d5 is a space distance between the second and third lenses on the optical axis, d6 is the thickness of the third lens on the optical axis, f is a focal length of the whole of the wide optical system, and f3 is a focal length of the third lens.

Abstract: An image pickup device includes an image pickup element that receives light of an object image formed by a picture-taking lens; and a focus detection filter section that is so disposed near the image pickup element and on the side of the picture-taking lens as to be able to be inserted or withdrawn. The focus detection filter section, from the side of the picture-taking lens, includes a field diaphragm that includes a plurality of openings; a condenser lens disposed near a focus detection area on the surface of the field diaphragm; a pupil division diaphragm that corresponds to the opening of the field diaphragm and includes a pair of openings arranged at such an interval as to secure focusing accuracy; and a re-imaging lens group that includes a plurality of re-imaging lenses that are so arranged as to correspond to the openings of each of the pupil division diaphragms.

Abstract: A zoom lens is provided with, in order from the object side, at least, a positive first group with a diffraction-type optical element, a positive second group, and a negative third group. A space between the first and second groups and a space between the second and third groups are increased in changing a magnification from the wide-angle end position to the telephoto end position, and the third group is fixed.

Abstract: The invention relates to a focus detection optical system used with the so-called autofocus (AF) system mounted on single-lens reflex cameras (SLRs) or the like, and an imaging apparatus incorporating it. The focus detection optical system comprises at least n focus detection areas that are adjacent to or intersect each other on a predetermined imaging plane, where n?2. A re-imaging lens group comprises n+1 re-imaging lenses, A (n?1)th re-imaging lens and an nth re-imaging lens are a pair of re-imaging lenses that correspond to a (n?1)th focus detection area and are adjacent to each other. An nth re-imaging lens and a (n+1)th re-imaging lens are a pair of re-imaging lenses that correspond to the nth focus detection area and are adjacent to each other. The (n?1)th re-imaging lens and (n+1)th re-imaging lens are located at different positions.

Abstract: A wide-angle optical system comprises, in order from its object side, a stop, a first lens (L1) having positive refracting power, a second lens (L2) having negative refracting power and a third lens (L3) that is an aspheric lens. The third lens is configured such that as viewed in a lens section including an optical axis, a portion thereof near the optical axis is in a meniscus shape convex on an object side thereof, and an object side surface and an image side surface thereof at a peripheral site are in a meniscus shape convex on an image side thereof. The optical system satisfies the following conditions (1-1) and (1-2). ?0.40<f/f3<0.15??(1-1) 0.30<hc7/hp7<2.0??(1-2) where f is the focal length of the whole wide-angle optical system, and f3 is the focal length of the third lens.