Fuji Photo Optical Co., Ltd.

Fuji Photo Film Company, Limited

Masaaki Morizumi

Shigeru Kondo

Naoki Takatori

Shino Kanamori

Hitoshi Miyano

Shigeo Mizukawa

Katsuo Katagiri

A front end structure of a stereoscopic endoscope comprises a lens barrel main body 3 having a pair of lens barrel portions 31R, 31L for holding and accommodating a pair of objective optical systems 32R, 32L so as to make them project toward an object, respectively; and a front end part main body 2 formed with a pair of holes 21R, 21L for receiving the respective lens barrel portions 31R, 31L, while the image-side end portion of the front end part main body 2 is formed like a cylinder surrounding the lens barrel main body 3. The left and right side portions 41R, 41L of the outer peripheral surface of the lens barrel main body 3 are inscribed in the cylindrical portion 26 of the front end part main body 2, so that the lens barrel main body 3 and the front end part main body 2 slidably mate with each other. As a consequence, the front end part main body 2 and the lens barrel main body 3 can be assembled to each other while in a state positioned with respect to each other with a high accuracy. One of the holes 21L and its corresponding lens barrel portion 31L may mate with each other with a play, whereby a greater tolerance in dimensions can be obtained in the making of the front end part main body 2 and lens barrel main body 3.

Front end structure of stereoscopic endoscope

A front end lens 11 of a pair of objective lenses 32R, 32L disposed the object-side end face of a front end part 1 of a stereoscopic endoscope has a so-called D-cut lens form in which both side portions of a spherical lens are cut off, whereby spaces for arranging illumination windows 13, lens surface washing nozzles 15, and heads of fastening screws 14 for fastening the front end part 1 to a front end part main body 2 are secured at the front end face of the front end part 1, while keeping its function of yielding a sufficient angle of convergence .theta.. A positioning pin 16 formed in the front end part main body 2 is inserted into a pin insertion groove 17 formed in a protrusion 12 of the front end part 1 at an eccentric position of the protrusion 12, whereby both members 1, 2 are inhibited from rotating relative to each other, and the relative positional relationship between the front end lens 11 and the pair of objective optical systems 32R, 32L can reliably be fixed.

Front end structure of stereoscopic endoscope including an elongated lens

A cylindrical grip member is connected to a back end of a body of an operation section at hand. The grip member is connected to face forward so that its axis can be at an acute angle against an axis of the back end of an insertion section. As for the grip member, it is possible to keep the body of the operation section horizontal if the grip member is held by a wrist in a natural way. Therefore, when this endoscope is used, the extra force does not have to be added to the wrist during observation. And, in the case that an angle formed by the body of the operation section and the grip member is set at 20.degree.-45.degree., it is possible to hold the grip member in such a manner that an arm holding the grip member is put against the side of a human body, that is, the underarm is tightened, so the body of the operation section can be stably supported.

Endoscope with acutely angled handle and associated focus adjustment

An endoscope illumination system having an objective lens system forming an image of an object of an internal organ or in a hollow structural body and a light guide fiber bundle for guiding illumination light generated by the light guide source to a light exit end thereof and illuminating the object includes a shift mechanism means for causing parallel movement of the optical axis of the light exit end with respect to and in a plane including the optical axis of the illumination lens system.

Illumination system for endoscopes

An overhead projector for projecting an image of a sheet material placed on a flat stage onto a remote screen standing almost vertically has a projection optical system with its optical axis aligned with a normal line of the stage. The projection optical system is shifted keeping the optical axis in parallel with the normal line so as to project an image at an angle of elevation onto the screen.

Overhead projector

A camera vibration correction apparatus for use with a zooming camera. The correction apparatus includes: a group of correcting lenses for correcting blurring of an image; a camera vibration detector that detects magnitude and directions of a camera vibration; a CPU for computing a correcting movement value on the basis of the detected vibration; driving motors for moving the correcting lenses on the basis of the correcting movement value; and a zoom detector that senses movement values of a group of movable lenses within the group of photographic lenses. The CPU activates the driving motors, allowing correction for vibration, when the zoom detector senses that the camera lenses are in a telescopic region and deactivate the driving motors, preventing correction, when the zoom detector senses that the camera lenses are in a wide angle region. Preferably, if the angle of view becomes more than 10.degree., the correction apparatus is activated, otherwise it is not. The correcting lenses are mounted for rocking movement by a novel mounting structure that is simple and provides stable support.

Camera vibration correction apparatus

A binocular stereomicroscope is provided with a binocular magnifying optical system and an objective lens unit, which is located in front of the binocular magnifying optical system. The objective lens unit is composed of a stationary objective lens and a movable objective lens. A focusing operation is carried out by movement of the movable objective lens. With the binocular stereomicroscope, a smooth, quick, and accurate focusing function can be achieved, and positions of the eyes of an operator need not be shifted in accordance with the focusing operation.

Binocular stereomicroscope

An overhead projector has a flat stage, for placing a sheet material thereon, which is inclined such that a normal line of the flat stage, which is in alignment with the optical axis of the projection lens, inclines an angle relative to a vertical line so that a reflection mirror disposed above the projection lens at an angle of 45 degrees directs an image projected by the projection lens toward a remote screen at a desired angle of elevation.

An aperture diaphragm, configured by a plurality of diaphragm blades which are formed with generally wedge-shaped notches for defining small diaphragm apertures, is provided with a supplemental diaphragm blade coupled to one of the diaphragm blades. The supplemental diaphragm blade has a supplemental notch which is similar in shape to but shallower than the generally wedge-shaped notch of the one of the diaphragm blades so as to block up the smallest diaphragm aperture defined by the generally wedge-shaped notches of the diaphragm blades.

Diaphragm with light blocking element

A compensator lens is driven by a second driving means such that the rear end of the focal depth of an object image at infinity coincides with a surface of image-formation irrespective of the movement of a variable lens when the object image is photographed. With this arrangement, the whole range of the focal depth can be effectively utilized, so that the range of photographing can be enlarged without focussing immediately after the power source is turned on as compared with the conventional zoom lens system. That is, even an object disposed at a close distance can be photographed without focussing as compared with the conventional zoom lens system which can utilize only the substantially half length of the focal depth. Furthermore, even when the object disposed at the closest distance is photographed, focussing can be made in a short period of time as compared with the conventional zoom lens system.

Zoom lens system

A binocular stereomicroscope comprises a binocular magnifying optical system, which is composed of right and left sets of elements, an objective lens, which is located in front of the binocular magnifying optical system, and an illumination device for irradiating a light beam for illumination, which has been produced by a light source, to an object via the objective lens. Semi-transparent mirrors are respectively interposed in the right and left sets of elements of the binocular magnifying optical system. A distance measuring device is provided with detection elements, on which images of light beams separated by the semi-transparent mirrors are formed. The distance measuring device generates a distance measurement signal from the relationship between positions, at which the right and left images of the light beams separated by the semi-transparent mirrors are formed. An automatic focusing function carries out a focusing function by operating a focusing mechanism in accordance with the distance measurement signal, which is generated by the distance measuring device.

Autofocus binocular stereomicroscope

A parallax correcting mechanism for a camera having a zoom lens. An objective lens is placed in the optical path of a viewfinder and is movable perpendicular to the optical axis of the viewfinder in cooperation with the focusing mechanism of the associated camera. A movable lens is also placed in the optical path of the viewfinder and is movable along the optical axis of the viewfinder in cooperation with the zoom adjustment of a zoom lens associated with the camera. The movement of the objective lens corrects for any parallax error between the viewfinder and an image seen by the zoom lens of the camera. The movement of the movable lens insures that the field angle of the viewfinder will correspond to that of the zoom lens.

Zoom lens drive mechanism

A zoom lens drive mechanism which is capable of zooming by moving first and second lens groups with a constant relation being maintained between them and of focusing by moving only the first lens group. A zoom shaft is disposed in parallel with the optical axis of the zoom lens and on the zoom shaft there is rotatably disposed a zoom cam ring which includes two cam grooves in the outer periphery thereof. In the zoom shaft there is disposed a first lens group drive means which is free to move in the axial direction of the zoom shaft and in the first lens group drive means there is provided a focus cam ring such that it is free to rotate. Two cam followers respectively provided in the first lens group drive means and in the second lens group are in engagement with the two cam grooves in the zoom cam ring, respectively, and a cam follower provided in the first lens group is in engagement with a cam groove formed in the focus cam ring.

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Omiya, Japan

Masaaki Morizumi