Abstract: A pair of binoculars includes: a pair of lens barrels in each of which a telescopic optical system including an objective lens and an eyepiece is held; a reticle that is provided between the objective lens and the eyepiece of one of the telescopic optical systems movably in an optical axis direction of the one of the telescopic optical systems; and an adjusting ring that moves the reticle in the optical axis direction by rotation operation to adjust a position of the reticle in the optical axis direction.

Abstract: An ocular lens used in an optical apparatus, such as a telescope optical system, includes the following lens groups sequentially arranged from the object side: a first lens group G1 having negative refracting power; a second lens group G2 including a lens component having a convex surface facing the viewer's eye side; and a third lens group G3 having positive refracting power. An object-side focal plane of the third lens group G3 is located between the second lens group G2 and the third lens group G3. The first lens group G1 includes the following lens components sequentially arranged from the object side: a first lens component G1A having a convex surface facing the object side, having negative refracting power, and having a meniscus shape; and a second lens component G1B having negative refracting power.

Abstract: A range finder 100 includes a transmission optical system 20 that transmits signal light toward a target object, a detection optical system 30 that has a different optical axis from that of the transmission optical system and detects the signal light reflected from the target object, and a photodetector 12 that is disposed on an imaging surface of the detection optical system. A distance to the target object is measured on the basis of a time difference between a transmission time and a detection time of the signal light. The detection optical system 30 includes a variable focal length optical system 14 that makes the focal length of the detection optical system variable, thereby providing a range finder capable of measuring a distance to a target object that locates from further away to nearer by using a photodetector having the same size.

Abstract: The present application provides a distance measuring apparatus that can measure a distance with accuracy even when a light receiving level of a reflected light becomes saturated. A light emitting section of the distance measuring apparatus emits a measuring light toward an object to be measured. A light receiving section receives the reflected light being reflected from the object to be measured. A distance calculating section obtains a distance to the object to be measured based on an elapsed time which is from a point the measuring light is emitted until a point a light receiving level of the reflected light indicates a peak thereof. A distance correcting section corrects a value of the distance to the object to be measured depending on a length of saturation time of the light receiving level when the light receiving level becomes saturated and the peak is impossible to identify.

Abstract: A tripod-connecting adapter for connecting a pair of binoculars to a tripod comprising: a base portion that has a width in which a left and a right lens barrels of the pair of binoculars to be placed thereon come into contact therewith, and restricts rotation of the pair of binoculars around a joint shaft that connects the pair of lens barrels of the pair of binoculars; and a holding device that is provided on the base portion and is connected to the joint shaft to support the pair of lens barrels so that said pair of lens barrels may be placed on an upper surface of the base portion to come in contact therewith, and restricts movement of the pair of binoculars in an optical axis direction of the pair of binoculars.

Abstract: A telescope optical system TL comprising, in order from an object side: an objective lens 1; an erecting prism 2; and an eyepiece 3; the objective lens 1 comprising, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power, focusing being carried out by moving the second lens group G2 along an optical axis, and an image position being movable by moving the third lens group G3 in a direction perpendicular to the optical axis, thereby providing a telescope optical system having optimum optical performance for a telescope.

Abstract: Providing a pair of binoculars that is able to prevent diopter from being changed after adjusting diopter difference by pushing down the focus knob after adjusting diopter difference so as not to touch the operating knob, and able to prevent the focus position from being changed after adjusting focus position by pulling out the focus knob to create a focus lock state after adjusting focus position.

Abstract: A laser range finder includes: a light source emitting light from a linear light-emitting portion with making a divergent angle of the light larger in a transversal direction of the light-emitting portion than in a longitudinal direction thereof; an objective lens projecting the light onto a target object and converging reflection light; a partial reflection member disposed between the light source and the objective lens and having a partial reflection surface composed of a transmitting area transmitting light emitted from the light source and receiving areas reflecting reflection light; and a photodetector detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion disposed substantially perpendicular to a longitudinal direction of the transmitting area as seen along an optical axis.

Abstract: Shift lenses 20L, 20R are provided on optical axes that pass through LCDs 40L, 40R for displaying an image for focusing. The shift lenses 20L, 20R are moved along the optical axes by pressing a focus button provided on a case 10 in accordance with an instruction displayed on the LCDs 40L, 40R. An amplitude of accommodation is calculated on the basis of a position where the image starts blurring upon moving the shift lenses 20L, 20R from a far point side focus position, and a position where the image starts blurring upon moving the shift lenses 20L, 20R from a near point side focus position.

Abstract: A range-finding device includes: a light emitting unit that continuously emits measurement light to be used for distance measurement toward a measurement target object; a light-receiving unit that receives reflected light reflected by the measurement target object; a calculation unit that repeatedly calculates a distance to the measurement target object over predetermined time intervals by using the reflected light; a display unit at which an update of the distance is displayed each time the distance is calculated by the calculation unit; and a display update control unit that prohibits the update of the distance on display at the display unit and sustains the display of the previously calculated distance at the display unit according to a change in the most recently calculated distance calculated most recently by the calculation unit relative to the previously calculated distance having been calculated previously by the calculation unit.

Abstract: Providing a sighting device having a simple structure, being easy to manufacture and free from parallax. A sighting device comprises, in order from a target object side, a positive meniscus lens having a convex surface facing the target object and a negative meniscus lens having a convex surface facing the target object, wherein the surface of said positive meniscus lens that faces away from said target object or the surface of said negative meniscus lens that faces toward said target object is adapted to constitute a semi-transparent reflection surface or a wavelength selective reflection surface, and a point source is provided at a focal point of a catadioptric optical system constituted by said semi-transparent reflection surface or said wavelength selective reflection surface and a refracting surface of the negative meniscus lens having with the convex surface facing said target object, the refracting surface facing away from said target object side.

Abstract: An achromatic lens system is provided with a cemented resin lens having positive refractive power constructed by a resin lens L11 having positive refractive power cemented with a resin lens L12 having negative refractive power, and a close-contact multi-layer type diffractive optical element L11E, the diffractive optical element L11E being disposed to an image side of the cemented resin lens, the diffractive optical element L11E being constructed by cementing two diffractive element members DE11, DE12 each made of different optical materials with each other, and the cemented surface thereof being a diffractive optical surface Gf on which grooves of a diffraction grating are formed, there by being lightweight and easily manufactured, capable of excellently correcting chromatic aberration and spherical aberration at the same time.

Abstract: An observation device has an ocular lens and an objective lens and is adapted to observe through the ocular lens an intermediate image of an object formed by the objective lens. The observation device further includes a display section provided either on a light path connecting the ocular lens and the objective lens or on a light path branched off from the light path and displaying an image, and a light path switching section provided on the light path connecting the ocular lens and the objective lens and switching the light to be guided from the ocular lens to the objective lens and the image displayed on the display section to be guided to the ocular lens or the objective lens, thereby providing a small-sized observation device and binoculars having a display function.

Abstract: A relay zoom system includes, in order from an object side, a first lens group having a positive refractive power and a second lens group having a positive refractive power. Furthermore, in the relay zoom system, the first lens group and the second lens group are each made up of at least two positive lenses and one negative lens. The first lens group and the second lens group in the relay zoom system are configured so as to move along an optical axis when magnification is varied from a lower magnification edge state to a higher magnification edge state.

Abstract: A distance measuring apparatus, which can achieve reduction in cost and size and perform measurement ranging from short-distance to long-distance accurately, includes an unit outputting first pulsed light L1 to a measurement object, an unit detecting first pulsed light L2 reflected by the measurement object to output a signal responsive to an intensity variation thereof, a measuring unit measuring a time difference between output and detection of the first pulsed light during a period when an intensity of the signal is larger than a predetermined value, a measuring unit measuring the time difference at a time when an intensity of the signal varies from less than a predetermined value to the predetermined value or more, and an unit calculating a distance to the measurement object using a time difference measured by at least one of the two measuring units.

Abstract: A laser range finder 100 includes: a light source 10 emitting light from a linear light-emitting portion 10a with making a divergent angle of the light larger in a transversal direction of the light-emitting portion 10a than in a longitudinal direction thereof; an objective lens 30 projecting the light onto a target object and converging reflection light; a partial reflection member 20 disposed between the light source and the objective lens and having a partial reflection surface 21 composed of a transmitting area 21a transmitting light emitted from the light source and receiving areas 21b reflecting reflection light; and a photodetector 40 detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion 10a disposed substantially perpendicular to a longitudinal direction of the transmitting area 21a as seen along an optical axis.

Abstract: A range-finding device includes: a light emitting unit that continuously emits measurement light to be used for distance measurement toward a measurement target object; a light-receiving unit that receives reflected light reflected by the measurement target object; a calculation unit that repeatedly calculates a distance to the measurement target object over predetermined time intervals by using the reflected light; a display unit at which an update of the distance is displayed each time the distance is calculated by the calculation unit; and a display update control unit that prohibits the update of the distance on display at the display unit and sustains the display of the previously calculated distance at the display unit according to a change in the most recently calculated distance calculated most recently by the calculation unit relative to the previously calculated distance having been calculated previously by the calculation unit.