Abstract: A binocular telescope with a photographing function comprises a pair of telescopic optical systems, a photographing optical system, and a pair of reticle elements, on which reticles are formed. The reticle elements are provided in the telescopic optical systems for focusing the telescopic optical systems. The distance between the optical axes of the telescopic optical systems can be adjusted, so that the reticle images are fused. The shapes of the fused reticle images are geometrically non-coordinate with each other.

Abstract: A reference plate is situated on an optical axis of an eyepiece. The reference plate includes a first glass plate and a second glass plate. One surface of the first glass plate and one surface of the second glass plate are bonded. Cross hairs are formed on the bonded surface of the first glass plate by using a chromium plating and so on. A radius of curvature of the bonded surface accords with the field curvature of the sagittal image surface of the eyepiece.

Abstract: The present invention aims at providing a granule comprising a slightly soluble in water and highly water-repellent physiologically active substance in a large content, and a solid preparation comprising the granule, which is superior in disintegration property and dissolution of the physiologically active substance from the preparation. The present invention relates to (1) a granule comprising a physiologically active substance and a cellulose-type disintegrant, (2) a granule comprising a physiologically active substance, a cellulose-type disintegrant and a binder, (3) a solid preparation comprising the granule described in (1) or (2), a cellulose-type disintegrant and a stearic acid-type lubricant and (4) the solid preparation described in (3), which is an oval tablet.

Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group. Upon zooming, each of the first through fourth lens groups independently move along the optical axis. The positive first lens group includes a negative first lens element and a positive second lens element, in this order from the object.

Abstract: An observation optical device comprises first and second focusing mechanisms, an association mechanism, and a reticle. The first focusing mechanism focuses an observation optical system. The second focusing mechanism focuses a photographing optical system. The association mechanism keeps the observation optical system and the photographing optical system in a focused state. The reticle is provided for focusing the observation optical system with a predetermined dioptric power during an operation of the association mechanism. The second focusing mechanism is constructed in such a manner that a measured dioptric power difference between a first dioptric power of an ocular lens system of the observation optical system and a second dioptric power of a combination of the observation optical system and the photographing optical system is cancelled.

Abstract: A zoom lens system includes a positive first lens group and a negative second lens group which move in an optical axis direction upon zooming. The positive first lens group includes a positive first lens element having a convex surface on the object side, a negative second lens element, and a positive third lens element. The negative second lens group includes a positive meniscus lens fourth lens element having the concave surface facing toward the object, and a negative meniscus fifth lens element having the concave surface facing toward the object.

Abstract: An intermediate telephoto lens system includes a first lens group and a second lens group. The first lens group includes a first lens element, a second lens element, a third lens element, an aperture stop, cemented lens elements constituted by a fourth lens element and a fifth lens element, and a sixth lens element. The second lens group includes a seventh lens element and an eighth lens element. Upon focusing, only the first lens group moves along the optical axis. The intermediate telephoto lens system satisfies the following condition: (&ngr;′1-1+&ngr;′1-2)/2>102 . . . (1); &ngr;′1-1: the dispersion ratio of the first lens element; &ngr;′1-2: the dispersion ratio of the second lens element; &ngr;′=(nd−1)/(ng−nF); nd: the refractive index of the d-line for each lens element; ng: the refractive index of the g-line for each lens element n the refractive index of the F-line for each lens element.

Abstract: In an optical viewer instrument with a photographing function, there is provided a telescopic lens system for observing objects, and a digital camera system including a solid-state image sensor and a photographing lens system associated with each other such that an object is formed as a photographed image on the solid-state image sensor through the photographing lens system. A manually-operable focussing mechanism is associated with the telescopic lens system and the photographing lens system such that the object is brought into focus through the telescopic lens system, and such that the object is brought into focus through the photographing lens system. Optical parameters are selected such that predetermined conditions are fulfilled, whereby the focussing of the telescopic lens system and the focusing of the photographing lens system can be suitably and properly performed by the focussing mechanism.

Abstract: In an optical viewer instrument with a photographing function, a telescopic lens system is used for observing an object, and a digital camera is used for photographing an object. The digital camera includes a CCD image sensor and a photographing lens system associated with each other such that the object is formed as a photographic image on the sensor through the photographing lens system. An automatically-operable focussing mechanism is associated with the photographing lens system such that the object is brought into focus through the telescopic lens system, and such that the object is brought into focus through the photographing lens system. Optical various parameters are selected such that predetermined conditions are fulfilled, whereby the focussing of the photographing lens system can be suitably and properly performed in an automatic focussing manner.

Abstract: In an optical viewer instrument with a photographing function, a telescopic lens system for observing an object and a digital camera system for photographing the object are housed in a casing. A manually-operable rotary wheel is rotatably provided in the casing such that a portion of the rotary wheel is exposed to the outside from the casing to bring the object into focus through the telescopic lens system. A display panel unit for displaying the object as a motion picture on a display screen thereof is mounted on the casing so as to be movable between a retracted position, where the display screen of the display panel unit is close to a wall surface of the casing, and a display position, where the display screen of the display panel unit is directed to the ocular-lens-system side of the telescopic lens system. The rotary wheel is arranged such that the exposed portion of the manually-operable rotary wheel is hidden behind the display panel unit when being at the retracted position.

Abstract: A viewing optical system includes an objective optical system and an eyepiece optical system. The objective optical system includes a positive first meniscus lens element having the convex surface facing toward the object, a positive second meniscus lens element having the convex surface facing toward the object, a negative third lens unit constituted by two negative lens elements, and a positive fourth lens element. The fourth lens constitutes an image-blur correcting optical system movable in a direction perpendicular to the optical axis. The viewing optical system satisfies the following conditions: 0.5<|tan 1°/(&phgr;1-4−&phgr;1-3)|<5 (mm) . . . (1) 0.5<SF4<1.0 . . .

Abstract: A photographing lens system including a first lens group, a second lens group, and a third lens group. The negative second lens group is moved to the image, upon focusing. The positive first lens group includes a biconvex lens element, another biconvex lens element, and a biconcave lens element. The second lens group includes cemented lens elements constituted by a meniscus lens element having the concave surface facing toward the object and a biconcave lens element. The photographing lens system satisfies the following conditions: 0.020<dX/f<0.20 . . . (1); (n1+n2)/2>1.52 . . . (2); (&ngr;1+&ngr;2)/2>55 . . .

Abstract: A zoom lens system including a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. Upon, all the lens groups move towards the object. A lens group other than the first one is a lens group for focusing, and a ratio K of traveling distance of the first to that of the second lens groups is made constant in any part of the focal length range. Furthermore, the zoom lens system satisfies the following condition: 0.16<K<0.50  (1) wherein K=&Dgr;X2/&Dgr;X1; &Dgr;X1 and &Dgr;X2 designate the traveling distances of the first lens group and the second lens group, from the short focal length extremity to the long focal length extremity.

Abstract: A photographing lens system including a first lens group, a second lens group, and a third lens group. The negative second lens group is moved to the image, upon focusing. The positive first lens group includes a biconvex lens element, another biconvex lens element, and a biconcave lens element. The second lens group includes cemented lens elements constituted by a meniscus lens element having the concave surface facing toward the object and a biconcave lens element. The photographing lens system satisfies the following conditions: 0.020<dX/f<0.20 . . . (1); (n1+n2)/2>1.52 . . . (2); (&ngr;1+&ngr;2)/2>55 . . .

Abstract: An intermediate telephoto lens system includes a first lens group 1, and a second lens group 2. The first lens group 1 includes a first lens element, a second lens element, a third lens element, an aperture stop, cemented lens elements constituted by a fourth lens element and a fifth lens element, and a sixth lens element. The second lens group 2 includes a seventh lens element, and an eighth lens element. Upon focusing, only the first lens group 1 moves along the optical axis. The intermediate telephoto lens system satisfies the following condition: (&ngr;′1-1 +&ngr;′1-2)/2>102 . . . (1); &ngr;′1-1: the dispersion ratio of the first lens element; &ngr;′1-2 the dispersion ratio of the second lens element; &ngr;′=(nd-1)/(ng-nF); nd: the refractive index of the d-line for each lens element; ng: the refractive index of the g-line for each lens element; nF: the refractive index of the F-line for each lens element.

Abstract: A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. Upon zooming, the first through fourth lens groups move toward the object so that the distance between the first and the second lens groups becomes longer, the distances among the second, the third and the fourth lens groups become shorter. The third lens group includes a positive 3-1st lens element, a positive 3-2nd lens element, and a negative 3-3rd lens element. The zoom lens system satisfies the following condition: −1.8<Ør3-3-1/Øw<−1.1...  (1) wherein Ør3-3-1 designates the surface power of the object-side surface of the negative 3-3rd lens element of the third lens group; and Øw designates the power of the entire lens system at the short focal length extremity.

Abstract: The internal focusing telephoto lens includes a first lens group I of positive refractive power, a second lens group II of negative refractive power and a third lens group III of positive refractive power, arranged in order from an object side. The second lens group II is movable along an optical axis for focusing. The first lens group I includes a first positive lens I-1, a second positive meniscus lens I-2 whose object side surface is convex, a third positive meniscus lens I-3 whose object side surface is convex and a fourth negative meniscus lens I-4 whose object side surface is convex, in order from the object side. At least two of the first positive lens I-1, the second positive meniscus lens I-2 and the third positive meniscus lens I-3 in the first lens group I satisfy the following conditions (1) and (2); 1.55<nI<1.75  (1) 61<&ngr;I  (2) where nI is refractive index and &ngr;I is Abbe number of the lenses in the first lens group I.

Abstract: A rear-focusing telephoto lens system includes a positive front lens group, and a positive rear lens group, in this order from the object The front lens group includes at least two positive lens elements, each of which has a large-curvature convex surface facing toward the object, and a negative lens element having a large-curvature concave surface facing toward the image. The rear lens group includes at least one lens element which has a convex surface facing toward the object, and is positioned at the most object-side in the rear lens group. Upon focusing, only the rear lens group moves along the optical axis, and the lens system satisfies the following condition: 0.5<f/fF<0.8  (1) wherein f designates the focal length of the entire lens system; and fF designates the focal length of the front lens group.

Abstract: A zoom lens system including a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. Upon, all the lens groups move towards the object. A lens group other than the first one is a lens group for focusing, and a ratio K of traveling distance of the first to that of the second lens groups is made constant in any part of the focal length range.

Abstract: A real-image zoom finder optical system in which the objective lens system, the condenser lens system, the erecting optical system and the eyepiece lens system are arranged in this order from the object. The objective lens system includes a negative lens group (O1) and a positive lens group (O2), in this order from the object, and these lens groups are moveable along the optical axis upon zooming. Further, the negative lens group (O1) includes a negative meniscus single lens element (O11) having a convex surface facing towards the object, and a meniscus single lens element (O12) having a convex surface facing towards the image, in this order from the object.