Abstract: It is provided that a lens positioning jig, a method of attaching lens barrel, and a lens device. A lens holding portion is inserted through a barrel insertion hole, and then a housing holding portion allows a barrel attachment portion to be thereby positioned and held in a lens housing. When an air pump is operated, a lens holding portion sucks and holds a convergent lens held in a second lens barrel and then positioned with respect to the barrel attachment portion. In addition, the second lens barrel is held in the lens housing so that the second flange does not come in contact with barrel attachment groove. Subsequently, an adhesive is filled into a gap formed between the second flange and the barrel attachment groove to thereby fix the second lens barrel thereto.

Abstract: Where two axes X and Y using the axial center position as the origin are set on a section orthogonal to the axial line of the distal end hard portion, the observation portion and the treatment equipment lead-out portion are disposed at both side positions between which the Y-axis is placed, the surface on which the solid-state image pickup device of the substrate is incorporated is disposed in a direction parallel to the X-axis, the center of the treatment equipment lead-out port is disposed between a plane parallel to the X-axis including the center of the optical axis of the object lens and a plane including the plane of the substrate, the line connecting the centers of both the illumination portions are roughly parallel to the Y-axis, and is drawn near the center of the optical axis of the object lens, and the distances between the center of the optical axis and both the illumination portions are made as equal to each other as possible.

Abstract: An electronic scan type ultrasound diagnostic instrument employing an ultrasound transducer which is constituted by an array of transducer elements in a predetermined direction and adapted to drive a plural number of adjacent located transducer elements in simultaneous or delayed action mode. Arrayed transducer elements are divided into a plural number of transducer assembly units in the arrayed direction. Each one of the transducer elements is provided with a separate electrode which is connected with a signal line separately from other transducer elements, and a common electrode which is connected commonly with one or a plural number of transducer elements. A signal line from a separate electrode of a transducer element is short circuited with a signal line from a transducer element in a different transducer assembly unit and connected together to a single wiring cable.

Abstract: An imaging lens comprises, in order from an object side: an aperture stop; a first lens having a positive refractive power in a meniscus form having a convex surface facing toward the object; a second lens having a positive or negative refractive power in a meniscus form having a concave surface facing toward the object; and a third lens having a positive or negative refractive power in an aspheric form at both surfaces, wherein conditional expressions given below are satisfied: ?d1>50??(1) ?d3>50??(2) 0.7<f1/f<1.0??(3) ?0.9<f2/{f3·(45??d2)}<0.4??(4) where ?d1: Abbe number of the first lens, ?d2: Abbe number of the second lens, ?d3: Abbe number of the third lens, f: Focal length of an overall system, f1: focal length of the first lens, f2: focal length of the second lens, and f3: focal length of the third lens.

Abstract: An imaging lens includes a first lens having a negative power and including a concave surface facing an image side, a second lens having a positive power, a third lens having a positive power, an aperture diaphragm, a fourth lens, which is a biconvex lens having a negative power, a fifth lens having a positive power and including a convex surface facing the image side, and a sixth lens having a positive power and including a convex surface facing an object side, which are arranged in this order from the object side. The Abbe number of a material forming the fourth lens with respect to the d-line is 30 or less. When the focal length of the entire lens system is f and a composite focal length from the fourth lens to the sixth lens is f456, the imaging lens satisfies following conditional expression: 1.00<f456/f<1.88.

Abstract: Abnormal noise generated while driving a piezoelectric actuator is prevented. A pulse-generation circuit is capable of selectively generating a displacement pulse and a stationary pulse as a drive pulse for application to a piezoelectric element, the displacement pulse having a duty ratio for causing a lens to be displaced by a predetermined step width, and the stationary pulse having a duty ratio for causing the lens to remain stationary in a current position. The pulse-generation circuit controls the production of the drive pulse continuously for a plurality of times within the servo control cycle, causes the displacement pulse to be produced when the remainder of a required amount of displacement is equal to or greater than a threshold value, and causes the stationary pulse to be continuously produced until the initiation of the next servo control cycle when the remainder is less than the threshold value.

Abstract: A high power zoom lens system includes, in order from the object side: a first lens group having a positive refractive power and remaining stationary during zooming; a second lens group having a negative refractive power and moving during zooming; a third lens group and a fourth lens group having a positive refractive power and being movable relative to each other to correct image plane variation accompanied by zooming; and a fifth lens group having a positive refractive power and including an aperture diaphragm, the fifth lens group being used for forming an image. The second lens group and a composite lens group formed by combining the third lens group and the fourth lens group pass simultaneously through ?1× magnification points of the groups during zooming from a wide-angle end to a telephoto end. The fourth lens group has at least one aspheric surface.

Abstract: A zoom lens is provided and includes: in order from an object side thereof, a first group having a positive refractive power; a second group having a negative refractive power; a stop; a third group having a negative refractive power, the third group including at least two positive lenses and at least two negative lenses; and a fourth group having a positive refractive power. Power variation from a wide angle end to a telephoto end of the zoom lens is performed by moving the second group to an image side along an optical axis thereof, while the first group and the third group are fixed, and correction of an image plane caused by the power variation and focusing is performed by moving the fourth group along the optical axis.

Abstract: In a digital camera, a solid state imaging device is used to catch subject light so that an image signal is created. The digital camera contributes to effectively implementing further thinness in such a manner that a part of image taking lenses is saved to a suitable position at the time of the collapse. Both the rear elements lens and the focus lens are revolved between a position on the optical axis and a saving position coming into a hollow portion beside the CCD solid state imaging device, or between the position on the optical axis and a saving position in which the front elements lens, the rear elements lens and focus lens form a line substantially on a plane.

Abstract: The focus adjustment support device is mounted on a lens apparatus included in an image pickup system for supporting the focus adjustment of the lens apparatus. The image pickup system comprises: an image pickup apparatus having a lens apparatus including focus adjusting section requiring a manual adjustment; and, a case member disposed at a given position for covering at least the image pickup range of the lens apparatus and focus adjusting section, while a portion of the case member corresponding to the image pickup range of the lens apparatus is made of a first light transmissible member having a given optical characteristic. The focus adjustment support device includes a second light transmissible member formed to have an optical characteristic which can provide the same image forming position as in a state where the case member is disposed at a given position.

Abstract: A zoom lens is provided and includes: in order from an object side of the zoom lens, a first lens group adapted to be fixed during power-varying of the zoom lens, the first lens group having a positive power and including in order from the object side, a negative lens, a reflecting member that bends an optical path thereof, and a biconvex lens of a positive lens made of a resin material and having at least one aspherical surface; a second lens group adapted to move during the power-varying, the second lens group having a negative power and including two lenses; a third lens group adapted to be fixed during the power-varying and including one positive lens; and a fourth lens group adapted to move during the power-varying and during focusing of the zoom lens, the fourth lens having a positive power and including in order from the object side, a cemented lens having a positive power, and a negative lens made of a resin material and having at least one aspherical surface and a concave surface on an image side of

Abstract: An imaging lens comprises, in order from an object side: a first lens having a negative refractive power with a concave surface on an image side thereof; a second lens with at least one aspherical surface; an aperture stop; and a third lens having a positive refractive power with at least one aspherical surface, wherein the first lens is formed of an optical glass whose Abbe number is 40 or more, the second lens is formed of a plastic whose Abbe number is 40 or less, and the third lens is formed of a plastic whose Abbe number is 50 or more, and wherein assuming that a point, where a light ray which constitutes an outermost light ray in light rays which enter an image plane intersects a lens surface, constitutes an effective aperture terminating edge, the second lens is such that an intersection point between an object side surface and an optical axis lies closer to an image forming side of the imaging lens than an effective aperture terminating edge of the object side surface does.

Abstract: To provide an automatic focusing system which has an AF pickup device dedicated to an AF operation and which can perform the AF operation with high following ability to a moving subject. At the time of performing an AF control operation, a CPU of a lens unit sets a focusing state of a photographing optical system to an in-focus state by controlling a focus lens group FL of the photographing optical system so that an estimated focus value representing the magnitude of a contrast of a subject image is the maximum. The CPU adjusts an electronic shutter speed of the AF pickup device based on a brightness level of an image signal acquired by the AF pickup device and enhances the frame rate of the AF pickup device as high as possible.

Abstract: An endoscope apparatus comprises: an endoscope comprising an imaging device that forms color image signals of a body to be observed; a Y/C signal processing circuit that forms brightness/color difference signals from a color image signal obtained by the imaging device; a storage portion that stores Y/C matrix data for forming a spectral image based on the brightness/color difference signals; and a Y/C spectral image forming circuit that conducts matrix calculation by the Y/C matrix data of the storage portion and the brightness/color difference signals output from the Y/C signal processing circuit and forms a spectral image of an arbitrarily selected wavelength range.

Abstract: A zoom lens is provided and includes: in order from an object side thereof, a first lens group having a negative refractive power, a stop; a second lens group having a positive refractive power; and a third lens group having a positive refractive power. The magnification of the zoom lens is varied from a wide angle end to a telephoto end by changing a space between the first lens group and the second lens group and a space between the second lens group and the third lens group. The first lens group includes: in order from an object side thereof, a negative lens having at least one aspherical surface and having a concave surface on an image side thereof; and a positive meniscus lens having a convex surface on the object side thereof. The zoom lens satisfies conditional expressions specified in the specification.

Abstract: An endoscope capable of preventing the cover member from being damaged and also preventing the airtight failure from being caused is disclosed. A projection 172 can reparably join with an opening 137. It becomes possible for the cover fitting member 170 and the cover member 130 to rotate together as one body when they join with each other. When they enter in this state, the cover fitting member 170 is screw-joined with a sleeve 120, thereby fitting the cover member 130 thereto. After this, the cover member 130 is moved in the axial direction to separate the projection from the opening, thereby it becoming for the cover member 130 to turn round the axis. On one hand, the movement of the cover member 130 in the axial direction is restrained by the cover fitting member 170 and the slide restraint member 180 as well.

Abstract: The present invention provides an autofocus system comprising: a lens device interchangeably attached to a camera and provided with an autofocus device which controls focus so that a subject within a predetermined AF area range within the image-taking range of the camera is focused; a controller which is connected to the lens device as an accessory device and which gives AF area information specifying the AF area range to the autofocus device, the autofocus system; an AF area information acquisition device which acquires the AF area information given to the autofocus device from the controller; and an AF area display device which visibly displays the AF area range in a picture taken by the camera based on the AF area information acquired by the AF area information acquisition device.

Abstract: A diagnostic ultrasonic probe for use in body cavities has at its tip an ultrasonic transducer array, which has a layered structure wherein a flexible circuit board, an electric circuit, a backing material, a piezoelectric element array, an acoustic impedance matching layer and an acoustic lens are formed atop another on a supporting member. The electric circuit includes at least one of amplifiers for amplifying echo signals from ultrasonic transducers, switches for switching over between sending the echo signals from the ultrasonic transducers and receiving drive signals for exciting the ultrasonic transducers, a multiplexer for selective-switching between the echo signals as well as between the drive signals, an A/D converter for converting the echo signals from an analog form to a digital form, and a D/A converter for converting the drive signals from a digital form to an analog form.