Abstract: Disclosed is a pair of range binoculars that, when the pupil distance is adjusted, is free from a deviation of the optical axes and undesirable influences on the electronic parts resulting from vibration caused by the adjustment, is capable to show the measured distance in such a way as the user can see it easily without making the system complicated, and secures the brightness of the visual field where the measured distance is displayed. The range binoculars are characterized in that a main case and an attached case contain a pair of left and right observation optical systems and the pupil distance is adjusted by turning only the attached case, and that the main case accommodates laser range-finding means, and measured distance displaying means comprising LCD means for displaying a distance measured by said laser range-finding means and a displaying optical system for projecting the distance displayed by said LCD means on the reticle so that the distance is shown at a rim of the visual field.

Abstract: The range binoculars include first and second observing optical systems, a laser beam-emitter for emitting a laser beam, a measuring optical system for collimating the laser beam and sending the collimated laser beam to a target. A laser beam-receiving device receives the laser beam reflected by the target, while a distance-determining device determines the distance between the observation place and the target from the flight time of the laser beam taken from the laser beam-emitter to the laser beam-receiver. A measurement-displaying device displays the measurements obtained by the distance-determining device.

Abstract: A pair of variable-powered binoculars include a pair of objective lens systems; a pair of prism systems, each of the prism system inverting an image that advances through the corresponding objective lens systems, from an inverted image to an erecting image; a pair of concave adjusting lenses, each of the concave adjusting lenses placed between a focus formed by the corresponding objective lens system and the corresponding prism system, so that each of the concave adjusting lenses is movable along the optical axis formed by the corresponding objective lens system and the corresponding prism system; and a pair of ocular lens systems, each of the ocular lens systems placed on the optical axis, so that each ocular lens system is movable along the optical axis closer to or away from the corresponding concave adjusting lens, synchronizing with a movement of the corresponding concave adjusting lens.

Abstract: The range binoculars include first and second observing optical systems, a laser beam-emitter for emitting a laser beam, a measuring optical system for collimating the laser beam and sending the collimated laser beam to a target. A laser beam-receiving device receives the laser beam reflected by the target, while a distance-determining device determines the distance between the observation place and the target from the flight time of the laser beam taken from the laser beam-emitter to the laser beam-receiver. A measurement-displaying device displays the measurements obtained by the distance-determining device.

Abstract: Disclosed is a pair of variable-powered binoculars capable of keeping a high resolution without causing much change in the quality of the image, securing a wide view, and making small the difference between the eye relief of a low magnifying arrangement and that of a high magnifying arrangement when they are switched.

Abstract: This invention provides a pair of range binoculars that, when the pupil distance is adjusted, is free from a deviation of the optical axes and undesirable influences on the electronic parts resulting from vibration caused by the adjustment, is capable to show the measured distance in such a way as the user can see it easily without making the system complicated, and secures the brightness of the visual field where the measured distance is displayed. The range binoculars are characterized in that a main case and an attached case contain a pair of left and right observation optical systems and the pupil distance is adjusted by turning only the attached case, and that the main case accommodates laser range-finding means, and measured distance displaying means comprising LCD means for displaying a distance measured by said laser range-finding means and a displaying optical system for projecting the distance displayed by said LCD means on the reticle so that the distance is shown at a rim of the visual field.

Abstract: The objective of the invention is to provide a field scope with a digital video camera for observing an object both by eye and on the monitor, losing such advantages of field scopes as having a large aperture, a light weight and a small size. The field scope with a digital video camera comprises an observation optical system having an objective optical system and an ocular optical system; beam-splitting means for taking a part of a light beam advancing along the light path of said observation optical system out from said light path, and guiding the rest of the light beam to said ocular optical system; and an image pickup unit for receiving the separated light beam.

Abstract: A lightweight and small-sized high-power monocular, or binoculars, including a wide-view telescopic optical system to have a wide view and a bright field of view is provided. The wide-view telescopic optical system includes a reverse reflection optical system interposed between an objective lens system and an eye lens system. The reverse reflection optical system includes a first reflector arranged at an angle of 45 degrees to an incident optical axis. The reverse reflection optical system also includes a right-angled isosceles triangle prism having roof surfaces whose ridge line is laid on an axis parallel with the incident optical axis so as to receive a reflected light from the first reflector at a part of an oblique side surface of the prism. The reverse reflection optical system further includes a second reflector arranged to oppose another part of the oblique side surface of the right-angled isosceles triangle prism from which light reflected by the prism is emitted.

Abstract: The invention aims to provide binoculars suitable to be used in a theater or a sports stadium, which can provide a wide and bright field of view on one hand, and which are compact and lightweight with improved portability and maneuverability on the other hand. Inverse reflection of an image is achieved by providing optical systems of inverse reflection, each comprising a pair of specular reflectors opposed to each other on an object side and an eyepiece side, respectively, so that an optical axis of light exiting the optical system of inverse reflection on the eyepiece side extends in parallel with an optical axis of light entering the optical system of inverse reflection on the object side, and one or more object lens(es) is or are placed on one or more path(s) selected from optical paths of reflection from respective specular reflectors forming the optical systems of inverse reflection.

Abstract: A wide-field eyepiece, formed of at least four lens groups and five lens elements, is disclosed which satisfies predetermined conditional expressions, so as to provide an eyepiece having an angle of view of at least 65 degrees with less than 6% distortion. The wide-field eyepiece is formed of, in order from the side of an image position 1 formed by an objective lens (not illustrated): a first lens group G.sub.1 of negative refractive power that includes a first lens element L.sub.1 having a concave surface on both sides, a second lens group G.sub.2 of positive refractive power that includes a second lens element L.sub.2 having a convex surface on the side of an observer's eye position, a third lens group G.sub.3 of positive refractive power wherein a lens element surface thereof has a convex surface on both sides and is cemented to a negative lens element having a concave surface on the side nearest the image 1 formed by the objective lens; and a fourth lens group G.sub.

Abstract: The present invention relates to a focal-length adjusting assembly for a pair of binoculars which adjusts the eyepieces relative to the optics and which can hold the adjusting screw or rod in a click-stopped position which automatically positions the eyepieces in a position for viewing an object at an infinite distance.