Abstract: A night vision monocular that includes an objective lens subassembly for receiving low intensity and/or infrared light. The objective lens subassembly focuses the light onto an image intensifier tube that converts the light into a visible image. The visible image passes through a collimator subassembly that collimates the visible image. Finally, the collimated image is viewed through an eyepiece subassembly. The objective lens subassembly, image intensifier tube, collimator subassembly and eyepiece subassembly are each separately manufactured subassemblies that are encased in subhousings and are ready to be assembled into a larger optical device. The housing of the present invention night vision monocular is a two piece structure, having a first half and an opposite second half. Partitions extend inwardly from a plurality of locations on both halves of the housing. The partitions are contoured and positioned to abut against and retain the various subassemblies within the night vision device.

Abstract: A zoom lens system is composed of three lens groups. Arranged in the order from an eyepoint side are a first lens group G.sub.1 having a positive refracting power, a second lens group G.sub.2 having a positive refracting power and movable along an optical axis during the period of zooming, and a third lens group G.sub.3 having a negative refracting power and movable along the optical axis during the period of zooming. In the second lens group G.sub.2, at least one positive lens includes a lens surface composed of an aspheric surface at least on one of its eyepoint side and object side. Not only a sufficient eye relief is ensured but also various aberrations are corrected throughout the whole zooming range.

Abstract: A device for accurately positioning the vertex of a secondary mirror (5) off-centered with respect to that of a primary mirror (3) of a telescope (1). The secondary mirror (5) is connected to a support (8). The connection (9) includes two radial and crossed elongate connecting members (10) which extend on either side of the support (8) (along a first direction X--X and a second direction Y--Y) passing through the center (0) of the support, corresponding to the vertex (5A) of the secondary mirror (5). Each of the connecting members (10) is longitudinally rigid and transversely flexible. Each of the connecting members is capable of being controlled, in order to move along its longitudinal extent by an actuation device (11).

Abstract: A telescope has an objective lens system, an eyepiece optical system, and a third lens system between the objective lens system and the eyepiece optical system. The objective lens system is provided with a circular shape lens whose upper and lower portions are cut off. The eyepiece optical system is also provided with a circular shape lens whose upper and lower portions are cut off. The third lens system is provided with a circular shape lens which is disposed in a position where a light beam formed by the objective lens system has a smaller cross-sectional area.

Abstract: A semitransparent mirror is attached to a holder on its objective side and an LED (light source) is attached to the holder on its ocular side. The light from the LED is reflected by the semitransparent mirror and provided as an aiming point. A receiving recess having an inclined axis is formed in one end of the holder on the objective side. A resilient ring, the semitransparent mirror and a support ring are received in the receiving recess in this order. Three or more adjusting screws are equally spacedly arranged in the circumferential direction. By selectively tightening the adjusting screws, the inclination of the semitransparent mirror is adjusted.

Abstract: An optical device comprising a spectacle frame having a pair of optical lenses. The optical device further includes a lens assembly pivotally attached to the spectacle frame which is pivotable between an operative position and a non-operative position. The optical device also includes an detent mechanism for repeatedly positioning the lens assembly into the operative position from the non-operative position. The lens assembly includes a support bracket for holding a pair of telescopes. The support bracket is contoured to the shape of the spectacle frame so that the bracket is substantially out of a user's forward line of sight when the lens assembly is in the operative position.

Abstract: A night vision device having an image intensifier tube, collimator lenses and at least one aspheric ocular lens are retained within a unistructurally formed optical bed. The optical bed is essentially a tubular structure having a large receptacle at one end to receive the image intensifier tube. The tubular structure is configured so that the various collimator lenses can be stacked within the tubular structure in a highly precise yet labor and cost efficient manner. A housing is provided that conforms to the shape of the electro-optical subassembly. The housing has a substantially similar ocular end structure and objective end structure. An objective lens assembly and ocular lens assembly are retained by the housing. Both the objective lens assembly and the ocular lens assembly contain at least one lens held with a commonly shaped lens casing.

Abstract: A telescope provided with an automatically opening and closing lens cover which obviates a protective cap attached to the main body. The telescope is provided with a lens hood disposed along a cylinder of the main body in such a manner as to be slidable forward and backward, and two movable lens covers disposed in such a manner as to cover the objective lenses provided at one end of the cylinder. The two lens covers are axially rotatably supported between the objective lenses. A guide pin is attached to the side surface of each lens cover, and a guide groove is provided on the inner surface of the lens hood in such a manner as to be engaged with the guide pin so as to open and close the lens cover by the forward and backward movements of the lens hood. When the lens hood is moved forward and the lens covers covering the objective lenses are opened, thereby enabling observation. When the lens hood is moved backward in this state, the lens covers are replaced to the original position and closed.

Abstract: The light-weight clinical viewer includes a two-element objective lens and a single-element eyepiece lens. Use of multiple lenses allows for a more compact package. The doublet objective serves to reduce vignetting while providing a wide field of view and reduced chromatic aberration. Image quality is further enhanced, while keeping the weight of the viewer down, through the use in the objective of light-weight high index glass. Moreover, the invention permits the use of a single mounting barrel assembly for different eyepieces to reduce manufacturing costs.

Abstract: The invention relates to a telescope mounting for a telescope. The telescope mounting is attached on an arm-band. The arm-band could include a watch. The telescope mounting ensures a stable support for the telescope. The length of the telescope should not be longer than 15 cm, preferably 6-7 cm so that the telescope will not be a burden on the arm of the telescope wearer. The diameter of the telescope is no larger than 1.5 cm. The telescope and telescope mounting could be releasable from the arm-band. A slip-on lens could be attached at the front of the telescope.

Abstract: A night vision device that uses low cost optics in a balanced arrangement that corrects for distortions created by the low cost optics. The night vision device is a monocular assembly that uses a Gen II or a Gen III image intensifier tube. An objective lens assembly, containing a plurality of low cost lenses, is positioned in front of the image intensifier tube so that the objective lens assembly directs low intensity light onto the input surface of the image intensifier tube. A collimator assembly is positioned proximate the output surface of the image intensifier tube, wherein the collimator assembly collimates the visible image produced by the image intensifier tube. The collimator assembly is comprised of lenses that are identical in shape, size and material to the lenses found within the objective lens assembly. However, the lenses in the collimator assembly are arranged in reverse, as a mirror image of the lenses in the objective lens assembly.

Abstract: A catadioptric optical system includes, in succession from the object side, a first partial optical system having positive refractive power and for forming the primary image of an object, and a second partial optical system having positive refractive power and for forming a secondary image by light from the primary image, and at least one aperture stop may be provided in the optical path of the first partial optical system and at least one aperture stop may be provided in the optical path of the second partial optical system.

Abstract: A telescope includes a master telescope whose aberration has been independently corrected and which has an objective lens and an ocular lens. A rear conversion lens is provided on the image side of the objective lens of the master telescope and is made of a single lens having a concave surface that faces an object side. The rear conversion lens meets the requirements defined by the following relationships: f.sub.o '/f.sub.o >1 and 0.5<(dx.sub.2 /dh.sub.2)/(dx.sub.1 /dh.sub.1)<1.3, wherein "f.sub.o " represents the focal length of the objective lens of the master telescope; "f.sub.o '" represents the resultant focal length of the objective lens of the master telescope and the rear conversion lens; "dx.sub.1 /dh.sub.1 " represents an inclination of an incident surface of the rear conversion lens at an incident point thereof, upon which light is incident at a height h.sub.1 ; "dx.sub.2 /dh.sub.

Abstract: An infrared refractive reimaging afocal telescope (10) has an objective lens group (12), an eyepiece lens (14), and a switching lens group (16). The system (10) provides a plurality of magnification modes in a compact arrangement. Diffractive surfaces are provided on at least one of the objective lenses and the eyepiece lens. Also, the system (10) utilizes switching lenses (40, 42, 44, 46) to provide magnification changes. The diffractive surfaces provide chromatic aberration correction. The system provides for excellent image quality in all modes using a minimum number of lens elements.

Abstract: A method and apparatus for allowing a user who wears spectacles including at least one lens having a positive magnification factor, to view a distant object through both the lens of the spectacles and a telescope. The method comprises the step of positioning a lens in the optical path of the telescope. The lens placed in the optical path of the telescope is adapted to cancel the positive magnification factor of the lens of the spectacles to maintain the afocal characteristic of telescope. The apparatus comprises at least one afocal telescope defining an optical path having a first lens oriented in the optical path for magnifying a distant object to be viewed through the afocal telescope system. The telescope further comprises a second lens oriented in the optical path for cancelling the positive magnification factor of the lens to maintain the afocal characteristic of the telescope.

Abstract: An equatorial mount for supporting a binocular reflecting telescope having two Cassegrain or Schmidt-Cassegrain reflecting mirror units having the same aperture and the same focal length. The equatorial mount includes a pedestal, a polar shaft (first shaft) supported obliquely by the pedestal. A second shaft is rotatably supported in a support barrel coupled to the polar shaft. A third shaft is rotatably supported in a second support barrel provided at the bottom end of the first support barrel. Counterweights are screwed onto a threaded rod so as to extend from the free end of a V-shaped crank which is mounted on the free end of the second shaft. Another counterweight is screwed onto another threaded rod mounted inside of the crank and extends in the same direction as the crank. The equatorial mount has a greater degree of freedom of rotation compared with a German-style equatorial mount, because it has the third shaft.

Abstract: A telescope-radio receiver assembly, in which a telescope and a radio receiver are built into a single casing, includes a casing made up of an upper half and a lower half as a substantially parallelepipedic hollow member. The casing is formed with a first housing section for housing a telescope section extending along its first lateral surface across two mutually opposite lateral surfaces extending at right angles to the first lateral surface, and a second housing section for housing a radio receiving section fitted with a bar antenna. The second housing unit is extended outward beyond a front side one of the two mutually opposite lateral surfaces extending at right angles to the first lateral surface. The radio receiving section has its bar antenna housed along the front side lateral surface extended beyond the second housing section for achieving good reception sensitivity without being affected by the telescope disposed within the casing.

Abstract: A binocular reflecting telescope having two Cassegrain or Schmidt-Cassegrain reflecting mirror units having the same aperture and the same focal length; each unit includes a concave primary mirror and a convex secondary mirror provided opposite to each other along each of two parallel first optical axes; the telescope also having two erect real image forming devices each including a combination of place mirrors for guiding a ray of light out of the first optical axis from a point between the primary mirror and the secondary mirror. Two eyepiece units are provided and are rotatable about the optical axes of the light rays guided out of the two erect real image forming devices.

Abstract: Binoculars designed to provide a large aided static field of view are provided. The binoculars are characterized by S/D ratios of above 2.8, where S is the binoculars' aided static field of view calculated by multiplying the binoculars' magnifying power by the binoculars' semi field of view in object space and D is given by tan.sup.-1 [(R.sub.ex +1.5)/13], where R.sub.ex is the radius of the binoculars' exit pupil and where R.sub.ex and the constants 1.5 and 13 are measured in millimeters. As a result of the increased S/D ratio, the binoculars' of the invention minimize the sensation of tunnel vision which normally occurs when binoculars are used and reduce the user's apprehension of missing activities in his or her peripheral vision. In certain embodiments, a movable field lens unit is employed to provide variable power and a negative corrector lens unit is employed for aberration correction and to minimize the size of the binoculars. The binoculars are suitable for mass production and general consumer use.

Abstract: A binocular mountable on a headgear, includes two optical systems, one for each eye of the user. Each system includes at least an objective lens and an eyelens. The binocular is pivotably attached to the headgear. When the headgear is in position on the user's head, the objective lenses and the eye lenses can be quickly swiveled out of the way to facilitate free and unaided vision, and returned to the position of binocular-aided vision. The binocular optical systems can be configured to provide either telescopic or microscopic effects. Moreover, the mounts of the lenses are transparent and integrally formed with the respective lenses. Thus, a continuity of visual field without "tunnel" vision is achieved. Hook and loop type fasteners can be used to attach the optical systems to the headgear, which can be either a cap or a visor. Additionally, a laser light/sun light shield can be provided. The optical systems can define bifocal optical systems. A single optical system (i.e.

Abstract: An epi-illumination system for microscopes is described, which contains an epi-illumination module (18) that consists of a Smith-splitter with an integrated telescope system (14). The telescope system (14) corrects in the sense of "Shift-Optics" differences in length that appear when switching from a modularly-designed 45 degree neutral splitter (20) to a Smith-splitter containing module (18). The arrangement of the two lenses in the telescope system (14) is such that the positive member (15) is directed towards the mirror (4) of the Smith-splitter and the negative member (16) is directed towards the light source (6). Alternatively it is also possible to install a telescope system with an opposite lens arrangement in a module (19), containing a 45-degree neutral splitter, if this is exchanged for a Smith-splitter containing module, so that the negative member (16) is directed towards the 45-degree neutral splitter (20) and the positive member (15) is directed towards the light source (6).

Abstract: An apparatus (10) for removable attachment to the adjustment ring (26) of telescope sights (12) for firearms (14) or the like is disclosed including a pinch clamping band (28) having an integral, elongated linear projection (42) extending axially therefrom. The clamping band (28) includes a split, annular wall (30) having a transverse radial cut defining first and second, free ends (32, 34). The free ends (32, 34) of the annular wall (30) are drawn together by a bolt (40) extending between bosses (36, 38) extending outwardly from the annular wall (30) on opposite sides of the transverse cut. A lever (50) has a securement end (52) positionable between the free ends (32, 34) of the annular wall (30) and including an aperture (60) for slideably receiving the bolt (40). The lever (50) extends axially from the clamping band (28) parallel to the axis (A) of the adjustment ring (26) and the projection ( 42).

Abstract: A microscope-telescope combination fitted with an illumination apparatus of a compact and simple structure having an illumination apparatus is effectively applicable both as the illumination for the microscope and as the flashlight. A microscope-telescope combination is fitted with an illuminating apparatus comprising of a telescope optical system, an auxiliary objection lens for forming a microscope optical system arranged so as to be projected into and retracted from the front of said objective lens of said telescope optical system, and a light source supported so that its illuminaing direction is changeable to a first direction parallel to an optical axis of said telescope optical system and to a second direction directing toward an observation position of said microscope optical system.

Abstract: The light-weight high-magnification clinical viewer includes a three-element objective lens and a two-element eyepiece lens. Use of multiple lenses allows for a more compact package. The doublet eyepiece lens serves to reduce chromatic aberration at high magnification. The triplet objective serves to avoid vignetting while providing a wide field of view and reduced chromatic aberration. Image quality is further enhanced, while keeping the weight of the viewer down, through the use in the objective of light-weight high index glass.

Abstract: A resetting mechanism for an electronic theodolite of the present invention is comprised of a horizontal shaft for vertically turning a telescope, a first cam provided at one end of the horizontal shaft, and a lock lever limited by the first cam. A second cam is locked or released by the lock lever, and operates a lock member. A lock concave provided on the telescope is locked by the lock member when the telescope is turned to a fully down, locked position. Also an encoder is set to a zero position when the telescope is turned to a fully down, locked position.

Abstract: In a sight scope device, a sleeve-like body is provided with a translucent mirror and a light source. Light emitted from the light source is reflected by the translucent mirror and proceeded toward an eyepiece side so as to served as an aiming point. A shield member interposed between the translucent mirror and the light source and having a plurality of through-holes is provided on the body. These through-holes have different areas, respectively, with each other. A movement of the shield member on a plane which is generally perpendicular to an axis of the body causes one of the through-holes to be selectively arranged or appeared on a line connecting the light source and the translucent mirror. The one of the through-holes is selected depending on a distance to a target.

Abstract: In a sight scope, an erect sleeve received in a scope body is inclined with respect to the axis of the scope body by an inclination adjusting mechanism. A movable sleeve capable of moving axially of the erect sleeve is disposed within the erect sleeve, and an erect lens system is supported by this movable sleeve. A position adjusting mechanism for moving the movable sleeve axially of the scope body includes a rotary member. This rotary member is allowed to extend all the way through the scope body and supported for turning about an axis extending radially of the scope body. The rotary member has a control handle formed on an external end of the rotary member and a cam member disposed on an internal end of it. A follower is received in the scope body. This follower is moved axially of the scope body in accordance with rotation of the cam member. The movement of this follower is transmitted to the movable sleeve through an association sleeve which is fitted to the outer periphery of the erect sleeve.

Abstract: The optical sensor (10) has a multiple telescope assembly (12), a rotating periscope assembly (14), an imager optical system (16) and a detector (18). The sensor (10) may be utilized with visible, ultraviolet or infrared wavelength radiation. Each telescope (12) views a particular sector of a scene. The rotating periscope (14) multiplexes the output of each telescope (12) to provide a combined wide field of view of each of the sectors. The system may be used in various types of navigation, pilotage, and monitoring systems.

Abstract: An aiming telescope has an inner tube mounted within the main tube on the eyepiece side, e.g. with a ball-and-socket joint, for receiving an inversion system and a reticle. For adjusting the reticle, a pair of adjusting spindles disposed at right angles to each other are provided, the restoring forces being applied by a spring which is supported on the ball of the ball-and-socket joint at a distance from the center of the ball, on the one hand, and on the main tube, on the other hand.

Abstract: A light-weight clinical viewer includes a two-element objective lens and a single-element eyepiece lens. Use of multiple lenses allows for a more compact package. The doublet objective serves to reduce vignetting while providing a wide field of view and reduced chromatic aberration. Image quality is further enhanced, while keeping the weight of the viewer down, through the use in the objective of light-weight high index glass. Moreover, the invention permits the use of a single mounting barrel assembly for different eyepieces to reduce manufacturing costs.

Abstract: A monocular telescope having a constant length includes a lens mounted in a tube and interchangeable eyepieces to vary the magnification. Focusing is performed using a positioning member to move a focusing unit axially in the tube. The rate of focus adjustment is adaptable to the selected magnification due to the provision of a transmission gear having different diameter gear wheels arranged along the positioning member. The transmission gear can be operatively coupled to the interchangeable eyepiece.

Abstract: A collapsible terrestrial telescope having a lens system which includes an objective lens and a terrestrial eyepiece, wherein the eyepiece includes an erecting lens group, and an eyepiece lens. The objective lens and the erecting lens group each include an aspheric surface. The objective lens may be one of an optically interchangeable doublet including a positive element having the aspheric surface and a negative element, or a singlet having the aspheric surface and a diffractive surface.

Abstract: A Newtonian binocular telescope (20), which is readily adaptable to popular telescope mounts, such as the Dobsonian mount (76), and which includes two primary mirrors (42a, 42b), and two secondary mirrors (32a, 32b), in a single tube (21) of either solid wall or open frame construction. The single tube (21) allows central secondary optical axes (34a, 34b) to be disposed in laterally and longitudinally separate parallel relation to one another so as to form a comfortable interocular axis (36) between them. Both telescopes' oculars (50a, 50b) are conveniently disposed adjacent an ocular wall (22) on a side of tube (21) nearest one of the telescopes. The viewer is provided easy access (91a, 91b and 92a, 92b) to primary alignment means (87a, 87b), which may be used to merge images between telescopes.

Abstract: A high-resolution synthetic aperture, adaptive optics system includes an imaging system having a plurality of optical elements including at least a primary mirror which is a section of the aperture to be synthesized, and a detector for receiving the radiation collected by the primary mirror; and a device for rotating the primary mirror section through a number of angular positions about the aperture being synthesized to obtain a plurality of component images of an object, at least one from each of the positions; a device for sensing distortion of an incident wavefront; and a device responsive to distortions of the wavefront for locally adjusting at least one of the optical elements to correct distortions in the wavefront.

Abstract: An articulated device for space vehicles, for example, for temporarily sealing the aperture of a space optical instrument. The device includes a fixed support element for mounting on the vehicle and an auxiliary element such as a temporary sealing flap mounted to pivot with respect to the fixed support element around a hinge axis between a first configuration (e.g. wherein the aperture is sealed) and a second configuration. The auxiliary element is attached, by a frangible controlled-break component for making temporary connections, to a hinge shaft whose rotation between the first and second configuration is controlled by an actuator. A torsional resilient return device is secured to the auxiliary element and to the shaft while resiliently biasing the auxiliary element to rotate it around the shaft in a predetermined direction. The shaft is substantially loosely engaged in journal bearings which are rigidly fastened to the auxiliary element.

Abstract: A pair of telescopic spectacles includes a frame having a top bar and a bottom rim disposed to provide an aperture and a lens having a bore therein disposed in the aperture of the frame. The telescopic spectacles further include a telescope assembly disposed through the bore of the lens at a predetermined convergence and declination angle. The telescope assembly includes a first housing having a first aperture, a first region with a bore therein and a second region having a cavity therein, a second aperture and a first surface. The telescope assembly further includes a lens retainer disposed in the first aperture of the first housing, and an eyepiece assembly disposed in the first region of the first housing. The eyepiece assembly includes a lens housing having a first end with a first aperture and having a second opposing end with a second aperture.

Abstract: A laser telescope is provided for reducing undesired laser thermal lensing effects which would otherwise impair the intensity and quality of a laser beam passing therethrough. An outer barrel is mounted in a chamber within a housing by ball bearings which hold the outer barrel longitudinally fixed but permits rotation of the outer barrel about its longitudinal axis. An inner barrel is coaxially situated within the outer barrel and includes a threaded outer surface which is threaded into a threaded inner surface of the outer barrel. A first lens is mounted adjacent one end of the chamber and a second lens is mounted in the inner barrel. A laser beam is directed through the laser telescope along the common axis of the chamber, the outer barrel, and the inner barrel. The lens spacing in the barrels is sensed and actuates a drive motor in proportion to the error between the sensed lens spacing and the desired lens spacing.

Abstract: Binoculars designed to provide a large aided static field of view are provided. The binoculars are characterized by S/D ratios of above 2.8, where S is the binoculars' aided static field of view calculated by multiplying the binoculars' magnifying power by the binoculars' semi field of view in object space and D is given by tan.sup.-1 [(R.sub.ex +1.5)/13], where R.sub.ex is the radius of the binoculars' exit pupil and where R.sub.ex and the constants 1.5 and 13 are measured in millimeters. As a result of the increased S/D ratio, the binoculars of the invention minimize the sensation of tunnel vision which normally occurs when binoculars are used and reduce the user's apprehension of missing activities in his or her peripheral vision. In certain embodiments, a movable field lens unit is employed to provide variable power and a negative corrector lens unit is employed for aberration correction and to minimize the size of the binoculars. The binoculars are suitable for mass production and general consumer use.

Abstract: A high-resolution synthetic aperture telescope system includes a primary mirror which is a section of the aperture to be synthesized; and a device for rotating the primary mirror section through a number of angular positions about the aperture being synthesized to obtain a plurality of component images of an object, at least one from each of the positions.

Abstract: An optical system (10) includes a three mirror anastigmat telescope (12) and imager optics (14). The imager optics (14) provide narrow and wide field of view staring of the viewed scene. The optical system is positioned in a turret assembly (50) and folded to provide a sensor. The sensor includes an output laser beam generator (90). The telescope (12) is shared by the infrared system and the laser (90) to provide a simplistic and compact turret arrangement (50) which is well suited for aircraft targeting and designation purposes.

Abstract: In a telescope according to the present invention, defocus amount of an optical system constituting the telescope is calculated; whether or not the defocus amount is within a predetermined in-focus range obtained from a focal point adjusting ability of human eye is discriminated; and when the defocus amount exceeds the in-focus range as a result of the above discrimination, the optical system is driven. The optical system is driven in a shorter time than a time required for removing a defocus by human eye.

Abstract: A new coronagraph sufficiently increases the contrast ratio between the infrared image of a nonsolar star and a possible orbiting nonsolar planet to make imaging of such a planet possible. The coronagraph is used with an infrared telescope system having a square objective or aperture. Unwanted stellar irradiance is diffracted orthogonally by the square telescope aperture or objective so that a coronagraph apodizer in the first focal plane in the shape of crossed arms, and a coronagraph Lyot stop in the pupil plane with a square opening, stop most of the on-axis direct and diffracted stellar energy while allowing most of the planet irradiance to pass through the coronagraph. The discarded light reflected from the back of the apodizer can be used to provide information concerning piston and tilt error of individual segments of a segmented telescope so that an array of correcting piston-tilt mirrors can be controlled to align the telescope.

Abstract: Holographic apparatus and methods are provided for generating high resolution telescopic images using low cost, small aperture lenses. Holographic media, such as photorefractive crystals, are used in conjunction with multiple and/or synthetic aperture techniques. In a multiple aperture system, a thin nonlinear holographic medium is used with a plurality of small optical lenses to compensate for the inherent piston and tilt errors of the lenses, thereby providing higher resolution. In another embodiment, synthetic aperture techniques are accomplished by illuminating a far field object with coherent light, deriving a reference beam from the coherent light, and changing the position of the reference beam in accordance with a computational formula. A hologram is formed from a sequence of image exposures in the holographic media, each made at different positions with respect to the image.

Abstract: A binocular-type optical device for night as well as day vision. A night vision optical device is located in a central body. The night vision optical device includes an optical path which is folded through a pair of opposed holes in a central body containing the night vision device. Two lateral bodies are affixed to the central body, each lateral body having a hole facing the holes in the central body. One of the lateral bodies faces an oblong hole in the central body, and is rotatable with respect to the central body. Each of the lateral bodies includes a day vision optical system having an objective at one end and an eyepiece at another end. A mirror contained in each lateral body are adjustable to permit either the folded night vision optical path or the day vision optical path to be received by a pair of common eyepieces.

Abstract: Focus adjustment assemblies for projection television are provided. Locking systems are also provided which lock the barrels of the projection television in position immediately after focusing and which have a reduced risk of warping the barrels.

Abstract: A new coronagraph sufficiently increases the contrast ratio between the infrared image of a nonsolar star and a possible orbiting nonsolar planet to make imaging of such a planet possible. The coronagraph is used with an infrared telescope system having a square objective or aperture. Unwanted stellar irradiance is diffracted orthogonally by the square telescope aperture or objective so that a coronagraph apodizer in the first focal plane in the shape of crossed arms, and a coronagraph Lyot stop in the pupil plane with a square opening, stop most of the on-axis direct and diffracted stellar energy while allowing most of the planet irradiance to pass through the coronagraph. The discarded light reflected from the back of the apodizer can be used to provide information concerning piston and tilt errors of individual segments of a segmented telescope so that an array of correcting piston-tilt mirrors can be controlled to align the telescope.

Abstract: An optical system with a tube having an open front end and a back end, imaging optics mounted in the tube and a plurality of light reflective baffle portions rotationally symmetric with respect to the optical axis, and wherein first baffle portions are configured as ellipsoids of revolution, all with foci lying adjacent edge portions of the open front end of the tube and facing the the open front end, and wherein the second baffle portions are configured as hyperboloids of revolution facing away from the open end and inwardly of the tube.

Abstract: The present optical system (20) provides an all-reflective vehicle rear vision optical system. A planar mirror (22), acting like a conventional vehicle rearview mirror, would be positioned to receive a beam. The beam would be provided by an image erecting assembly (30) which, in turn, would reflect the beam into a three-mirror anastigmat telescope (24, 26 and 28) to provide rearward image beam to the first planar mirror and in turn, to the exit pupil (25). The optical system provides a 2X magnification at a wide field of view which substantially eliminates blind spots.

Abstract: A star tracker for generating positional information for a vehicle includes a holographic telescope (150) having one or more fields of view for imaging stellar objects. The telescope includes a plurality of radiation detectors (100) and an input aperture comprised of a primary holographic optical element (HOE) (134). The primary HOE provides one or more wavefronts to one or more secondary HOEs (136), each of which applies a chromatic correction so as to correct for a chromatic aberration induced by the primary HOE. A single or multiple field of view Schmidt telescope embodiment is also disclosed having one or more aspheric corrector plate HOEs and one or more associated concave spherical reflectors.

Abstract: In a dioptric sight having a tubular body with an eyepiece including an adjustable iris diaphragm mounted on one end thereof and a plastic sleeve mounted on the eyepiece, the tubular body and the sleeve each has at least one transverse slot formed therein for receiving filter discs of a diameter corresponding to the diameter of the tubular body, the filter discs being lockable in the slots but being easily removable for cleaning and exchange.