Abstract: An oblique projection optical system for leading rays of light from a display surface on which an image is displayed to a projection surface in such a way that the ray of light from the center of the display surface is obliquely incident on the projection surface in order to project a magnified image of the image displayed on the display surface onto the projection surface includes a plurality of reflecting surfaces having a power. At least two of the reflecting surfaces have a free-form curved surface, and, of all the reflecting surfaces, the one closest to the projection surface has a negative power and at least one of the other has a positive power. Alternatively, in a rear projection optical system having a projection optical system for projecting an image displayed on a panel display surface onto a screen surface, the projection optical system includes at least four curved-surface reflecting mirrors.

Abstract: An image-taking optical system for forming an optical image of an object on the light-receiving surface of an image sensor includes a plurality of optical blocks. The optical blocks each have a prism unit provided with a curved surface and an optical unit composed of a member different from a member composing the prism unit. The prism unit uses the curved surface as a total reflection surface and also as a transmission surface. The optical unit has near the curved surface a curved surface identically or substantially identically shaped therewith.

Abstract: The present invention provides image pickup optical systems capable of suppressing the degradation of the image quality due to unnecessary light beams while attaining compaction by optimizing the shapes of the emission surfaces of reflection prisms. The image pickup optical system includes an incidence-side prism for reflecting incident light while folding it by about 90 degree and an image-surface side prism. An image pickup device is placed near the emission surface of the image-surface side prism. The incidence-side prism is formed to have a convex emission surface. This can reduce the amount of the unnecessary light beams (stray light) reflected by the aforementioned reflection surface and also causes the unnecessary light beams reflected by the emission surface and the reflection surface to be diffused, thereby significantly reducing the amount of unnecessary light beams directed to the light receiving surface of the image pickup device.

Abstract: An antitumor agent comprising as an active ingredient a DNase, and novel DNases are disclosed. The novel DNases are derived from human stomach cancer cell line MKN-28 or human cervical cancer cell line HeLa, and do not act on normal cells but specifically act on cancer cells.

Abstract: An optical system is used in an optical pickup apparatus which conducts reproducing and/or recording information for a first optical disk having a thinner protective substrate t1 [mm] and a second optical disk having a thicker protective substrate t2 [mm]. The optical system comprises a relay lens group comprising at least one movable lens group. The movable lens group moves so that for the first optical disk, a parallel or substantial parallel light flux emitted from the relay lens group enters the objective lens while a divergent light flux emitted from the relay lens group enters the objective. The movable lens group satisfies the following formula: 7.5<=(NA1·?)/(t2?t1)<=22.

Abstract: A taking lens apparatus has a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal.

Abstract: An oblique projection optical system for leading rays of light from a display surface on which an image is displayed to a projection surface in such a way that the ray of light from the center of the display surface is obliquely incident on the projection surface in order to project a magnified image of the image displayed on the display surface onto the projection surface includes a plurality of reflecting surfaces having a power. At least two of the reflecting surfaces have a free-form curved surface, and, of all the reflecting surfaces, the one closest to the projection surface has a negative power and at least one of the other has a positive power. Alternatively, in a rear projection optical system having a projection optical system for projecting an image displayed on a panel display surface onto a screen surface, the projection optical system includes at least four curved-surface reflecting mirrors.

Abstract: A reflecting prism (PR1) and a reflecting prism (PR2) each adapted to bend an incident ray at a predetermined angle for reflection are arranged in such a manner that an incident surface of the reflecting prism disposed on a side of a subject on an optical path and the exit surface of the other reflecting prism are aligned substantially parallel to each other. The incident surface or the exit surface of at least one of the reflecting prisms has an optical power. At least one lens group including one or more lens element is arranged between the two reflecting prisms in such a manner that the optical axis of the lens group is coincident with the axis of the optical path between the two reflecting prisms. At least one lens group is moved in the direction of the optical axis thereof. Thus, provided are a thin and superfine zoom optical system, an imaging lens device incorporated with the zoom optical system, and a digital apparatus loaded with the imaging lens device.

Abstract: To obtain an optical element for generating near-field light which can accurately detect positions of a plurality of minute structures formed on a metallic thin film provided to a condensing surface, and a method of adjusting an optical spot position of the optical element. The metallic thin film is formed on the condensing surface of the optical element that condenses incident light so as to generate near-field light smaller than an condensing spot B near a condensing point, and a plurality of openings (minute structure) for generating the near-field light are formed into a matrix matter on the metallic thin film, and position detecting structures are formed on positions that partitions the openings is formed. Scanning in X and Y directions is carried out by a light beam, and its reflected light is detected so that the positions of the openings are detected.

Abstract: An image-taking optical system for forming an optical image of an object on the light-receiving surface of an image sensor includes a plurality of optical blocks. The optical blocks each have a prism unit provided with a curved surface and an optical unit composed of a member different from a member composing the prism unit. The prism unit uses the curved surface as a total reflection surface and also as a transmission surface. The optical unit has near the curved surface a curved surface identically or substantially identically shaped therewith.

Abstract: An oblique projection optical system for leading rays of light from a display surface on which an image is displayed to a projection surface in such a way that the ray of light from the center of the display surface is obliquely incident on the projection surface in order to project a magnified image of the image displayed on the display surface onto the projection surface includes a plurality of reflecting surfaces having a power. At least two of the reflecting surfaces have a free-form curved surface, and, of all the reflecting surfaces, the one closest to the projection surface has a negative power and at least one of the other has a positive power. Alternatively, in a rear projection optical system having a projection optical system for projecting an image displayed on a panel display surface onto a screen surface, the projection optical system includes at least four curved-surface reflecting mirrors.

Abstract: An imaging optical system 100 has an imaging side prism 102 for bending incident light at about 90 degrees for reflection, and an image sensor 105 having a light receiving surface opposing to an exit surface 102b of the imaging side prism 102. At least one of an incident surface 101a of an incident side prism 101 and an incident surface 101a of the imaging side prism 102, or at least one of an exit surface 101b of the incident side prism 101 and the exit surface 102b of the imaging side prism 102 has an optical power. An arrangement relation between the exit surface 102b of the imaging side prism 102 and the image sensor 105 is established to satisfy the conditional formula (1): 0.0?d/a<0.8 ??(1) where d represents a distance between the exit surface 102b and the light receiving surface of the image sensor 105, and a represents a height of the light receiving surface of the image sensor 105 on a plane where an optical path of the imaging optical system 100 is folded, e.g.

Abstract: An image-taking lens apparatus has an image sensor for converting an optical image of a subject into an electrical signal and an image-taking lens system for forming the optical image on the image sensor. The image-taking lens system includes a prism for bending the optical path, and the refractive index of the prism fulfills a prescribed conditional formula.

Abstract: A motorcycle, having both left and right mufflers, has an exhaust structure which enables an increase in the allowable margin through which the rear wheel is permitted to rise. A main exhaust pipe extends from an engine to one side of a shock absorber disposed on the rear side of the engine. The main exhaust pipe is branched in the vicinity of the shock absorber into a first branch pipe and a second branch pipe. The first branch pipe is connected to a first muffler disposed on the same side as the main exhaust pipe, and the second branch pipe is connected to a second muffler after passing between the shock absorber and a rear wheel to the opposed side of the vehicle body. The second branch pipe does not interfere with the rising motion of the rear wheel, and a sufficient allowable margin is secured for the rear wheel.

Abstract: A refracting objective optical system used in recording and/or reproducing information by near field light includes an aspherical lens in which an entrance surface is a continuous aspheric surface of convex shape and an exit surface is a flat surface, and a transparent flat plate joined to the flat surface of the relevant lens. The ray entering a first surface of the lens is refracted at the first surface, transmitted through a second surface and the flat plate, and condensed at a microscopic spot near an exit surface of the flat plate. The transparent flat plate includes a microscopic structure for generating a surface excitation plasmon near a light condensing point of the exit surface.

Abstract: A catadioptric objective system used for storage and/or reproduction of information by use of an optical near field. The catadioptric objective system is composed of a catadioptric objective lens and a light transmitting plate. The lens has a first surface and a second surface. The first surface has a positive optical power and transmits incident rays. The second surface has a positive optical power and reflects incident rays, and a plane portion is formed in the center of the second surface. The light transmitting plate has a third surface and a fourth surface which are substantially parallel to each other, and the third surface is bonded to the second surface. Incident rays pass through the first surface and are reflected by the second surface. Thereafter, the rays enter into the first surface again and are reflected by the first surface. Then, the rays pass through the plane portion of the second surface, and the rays are converged in vicinity of the fourth surface.

Abstract: An image taking apparatus has a solid-state image-sensing device, a shutter for shutting off the light incident on the solid-state image-sensing device, and a zoom optical system. The optical aperture stop of the zoom optical system and the shutter are located both on the optical axis but at different positions. During zooming, while the optical aperture stop moves along the optical axis, the shutter is kept stationary. The zoom optical system has an optical member having an optical power disposed on the image-plane side of the shutter.

Abstract: A taking lens apparatus has a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal.

Abstract: An oblique projection optical system for leading rays of light from a display surface on which an image is displayed to a projection surface in such a way that the ray of light from the center of the display surface is obliquely incident on the projection surface in order to project a magnified image of the image displayed on the display surface onto the projection surface includes a plurality of reflecting surfaces having a power. At least two of the reflecting surfaces have a free-form curved surface, and, of all the reflecting surfaces, the one closest to the projection surface has a negative power and at least one of the other has a positive power. Alternatively, in a rear projection optical system having a projection optical system for projecting an image displayed on a panel display surface onto a screen surface, the projection optical system includes at least four curved-surface reflecting mirrors.

Abstract: An image taking apparatus has a solid-state image-sensing device, a shutter for shutting off the light incident on the solid-state image-sensing device, and a zoom optical system. The optical aperture stop of the zoom optical system and the shutter are located both on the optical axis but at different positions. During zooming, while the optical aperture stop moves along the optical axis, the shutter is kept stationary. The zoom optical system has an optical member having an optical power disposed on the image-plane side of the shutter.