Patents Assigned to Kern & Co. AG
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Patent number: 5003187Abstract: For sensing the surface of an object, a number of gratings with linear line patterns of different periods on a common carrier are successively projected onto the surface. Images of the line patterns deformed at the object surface are detected and stored by a television camera and evaluated by an electronic circuit. The evaluation comprises computing, from the residual phases of the object points within each fringe of the linear pattern, the absolute heights of these points with respect to a common reference plane.Type: GrantFiled: January 17, 1990Date of Patent: March 26, 1991Assignee: Kern & Co., AGInventors: Roland Zumbrunn, Linus Richner
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Patent number: 4957375Abstract: A shaft is guided axially with respect to position and clearance in a bearing flange. The guidance is adjustable by means of guiding pieces engaging a turned groove of the shaft. The groove has oblique conical sidewalls, and each guiding piece by radial adjustment limits the axial position of a respective sidewall.Type: GrantFiled: October 10, 1989Date of Patent: September 18, 1990Assignee: Kern & Co. AGInventor: Dieter Hoffmann
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Patent number: 4916324Abstract: To simplify the reflectors for electro-optical distance measurement with a distance measuring apparatus with modulation of light outside of the light source, the optical bundle for distance measurement is focussed on to the target. Thereby, distance measurements on unprepared (non-cooperative) objects or on objects prepared only with simple reflecting foils are made possible.Type: GrantFiled: September 29, 1988Date of Patent: April 10, 1990Assignee: Kern & Co. AGInventor: Dietrich Meier
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Patent number: 4877324Abstract: The optical aiming device may be mounted on firearms. It comprises a light-collecting rod (8) consisting of a phosphor material to illuminate a central circular spot (22) of an aiming mark (6). Such illumination passes through a truncated hollow cone (25) and is used for good ambient light conditions. For poor ambient light four tritium luminous cells (18, 19, 20, 21) are mounted around the truncated hollow cone (25). Each tritrium cell illuminates one radial line component (23) of the aiming mark (6) via the external mirrored lateral area of cone (25). To adapt the brightness of the aiming mark to the brightness of the target the tritium luminous cells (18, 19, 20, 21) may be shifted on a circle around cone (25) with respect to the line components (23) of aiming mark (6).Type: GrantFiled: July 23, 1987Date of Patent: October 31, 1989Assignee: Kern & Co. AGInventors: Bernhard Hauri, Hans Etter
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Patent number: 4759623Abstract: For electrooptical measurement of distance with modulation of light external to the light source (1) a modulator system (5, 7, 8, 11) with low sensitivity to temperature and with a low modulating voltage is disclosed. The temperature dependence of the static birefringence of a modulating crystal (7) is compensated by passing the modulated light beam (6), after traversing the crystal (7), a quarterwave plate (11), the measured path (9) and the quarterwave plate (11) again--a second time through the crystal (7) with its polarization rotated by 90.degree.. The light beam returning from the measured path is separated from its source (1) by means of a polarizing beam splitter (5).Type: GrantFiled: June 10, 1986Date of Patent: July 26, 1988Assignee: Kern & Co. AGInventor: Dietrich Meier
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Patent number: 4681433Abstract: For simplification of storage of measured range and direction values in surveying, as well as for coordination and processing of these values with additional information these values are transmitted from the measuring station (1,2) to the target point (2'). The additional information is mainly obtained at the target point (2') at a distance from the measuring station (1,2) and at the other end of the measured range, whereas the measured values are transmitted by modulating electric signals upon the infrared beam of an electrooptic range-finder (2) or by means of a separate short wave link. At the target point (2') there are a signal receiver and a programmable data storage device (3) which accepts the additional information keyed in by hand via a keyboard (17).Advantages are obtained by this method in simplifying the observer's task and preparation of reports, providing automatic data transmission and therefore reducing reading and transmission errors.Type: GrantFiled: February 2, 1981Date of Patent: July 21, 1987Assignee: Kern & Co. AG.Inventor: Heinz Aeschlimann
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Patent number: 4553836Abstract: With an electrooptical distance meter impulses of light are transmitted over the distance. The distance is found by counting the duration of gating signals which last between transmission and reception of the light impulses. 10,000 times of travel generated by a first digital circuit (16, 17, 18) are communicated to a second digital circuit (1, 19, 20) for storing and processing. The distance is computed by the second circuit (1, 19, 20) by forming a mean value from the more frequent counts. By evaluation of artificial gating signals of various durations and by generation of gating signals from the light impulses by means of various threshold levels an improved accuracy of distance measurement is achieved, even when measuring on natural, non cooperative objects.Type: GrantFiled: August 30, 1982Date of Patent: November 19, 1985Assignee: Kern & Co. AG.Inventors: Dietrich Meier, Hans-Ulrich Minder
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Patent number: 4482118Abstract: This invention provides an adjusting base for geodetic instruments.By a double function of a clamping ring the adjusting base may be used with both instruments with a standard central single peg and instruments with more pegs arranged around a common center. Various interchangeable parts enable the adjusting base to be used on all known tripods and pillar plates.Type: GrantFiled: June 2, 1982Date of Patent: November 13, 1984Assignee: Kern & Co. AGInventor: Dieter Hoffmann
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Patent number: 4482219Abstract: This invention provides a high speed compact catadioptric, i.e. reflecting-refracting objective system of F/1.2.The lens system comprises, in accordance with the advance of the light rays, a positive lens with a convex surface toward the object, a lens with front and back surface concave toward the object and with a main mirror surfaced on the peripheral portion of said back surface. A counter-mirror is surfaced to the central portion of said positive lens and a field lens is cemented to the central portion of said lens with the main mirror surfaced thereon. Small zonal errors of spherical aberration, economical production and a reduced sensitivity to machining and mounting errors result from employing only two optical members which carry the mirrors and lens elements.Type: GrantFiled: October 3, 1980Date of Patent: November 13, 1984Assignee: Kern & Co. AGInventor: Ludvik Canzek
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Patent number: 4352556Abstract: A reflector for electrooptical measurement of the distance between a first (3) and a second point (4) is arranged with a right angle sighting device (13) in a common case (8). The reflector (6) may thus be set up at a point (5) where the directions to the first (3) and second points (4) form a right angle. This facilitates the distance measurement between points (3, 4) that are not suited for the set up of reflectors or where visual contact between the points (3, 4) is impaired by an obstacle (1).Type: GrantFiled: March 19, 1980Date of Patent: October 5, 1982Assignee: Kern & Co. AGInventors: Erwin Haefliger, Fritz Hinden, Aldo Lardelli
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Patent number: 4274736Abstract: With an electrooptical distance meter a reference signal is timeshifted by means of an electronic phase shifter (20), until it has a given phase relation to the measurement signal. Both signals are compared in phase by a double balanced mixer (22), the output of which directs the electronic phase shifter (20) by a control loop (20, 22, 23). The phase shift is measured after frequency conversion by two additional double balanced mixers (24, 25). Thus handy precision distance meters with measurement frequencies about 500 MHz may be built, comprising control loops for laser diode transmitter (1), avalanche diode receiver (13), phase shifter (20) and intermediate frequency, as well as a processor (5, 29) control for automatic function of the instrument.Type: GrantFiled: September 26, 1979Date of Patent: June 23, 1981Assignee: Kern & Co. AGInventor: Beat Balmer
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Patent number: 4259010Abstract: A restitution instrument for measuring and evaluating picture plates. The instrument includes a mounting stage for mounting the plate. The stage has two edges forming a 90.degree. angle. A carriage means attached to the stage, is used for guiding the stage free of rotation in directions parallel to the edges, i.e., X and Y directions. A drive means is attached to the stage for driving the stage in the X and Y directions along the carriage means. The drive means includes a drive unit slidably mounted to each of the edges and a drive member driven by a drive motor. The member is mounted at 90.degree. to the edge. The member drives the stage in a line of motion perpendicular to the edge. The lines of motion of each of the members intersects at a fixed point whose projection on to the stage falls upon an image point under observation. The drive means includes a measuring means for determining the distance the stage is driven in each of the X and Y directions.Type: GrantFiled: December 26, 1978Date of Patent: March 31, 1981Assignee: Kern & Co. AGInventor: Bernhard Hauri
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Patent number: 4136955Abstract: The corrected values to compensate for errors in instrumental levelling of a theodolite and similar instruments are found by determining angles of elevation and/or horizontal directions, measuring the instrumental levelling errors, and calculating the error free values of the instrument.Type: GrantFiled: August 27, 1976Date of Patent: January 30, 1979Assignee: Kern & Co. AGInventors: Heinz Aeschlimann, Rene Nunlist, Rudolf Stocker
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Patent number: 4003665Abstract: A stylus is assembled from a plastic tip having an axial bore and an ink tube in said bore centered therein and welded thereto. Ultrasonic welding is used for softening and partially melting the tip. On switching off the ultrasonic energy source, the molten portion of the tip hardens and provides a strong bond between the tip and the ink tube.Type: GrantFiled: March 20, 1975Date of Patent: January 18, 1977Assignee: Kern & Co. AGInventors: Hans Dreyer, Roman Etter