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| Number | Title | Issue Date |
| 4564294 | Encapsulated photoelectric measuring system An encapsulated photoelectric measuring system for measuring the relative position of two objects includes a housing which encloses a scanning unit positioned to scan the graduation of a measuring scale. The housing defines a longitudinal slit closed by s... | 01/14/1986 |
| 4549808 | Movable aperture photoelectric measuring instrument A photoelectric measuring instrument for determining position deviations of an object is provided with an illuminated aperture and an objective which cooperate to generate an image of the illuminated aperture on the object to be measured. The image of the... | 10/29/1985 |
| 4527056 | Error correction system for position measuring device A length or angle measuring system is provided in which for the purposes of error correction the graduation of the measuring scale is scanned on both sides of the graduation axis which runs along the measuring direction. The weighting given to the two sid... | 07/02/1985 |
| 4498736 | Method and apparatus for producing visual patterns with lenticular sheets A lenticular sheet system having an air gap between a pair of superimposed lenticular sheets which does not diminish or attenuate the spacial optical effect produced by the superimposed lenticular sheets and which is made possible by coating both sides of... | 02/12/1985 |
| 4492032 | Coupling arrangement for length measuring device A coupling apparatus for a length measuring instrument is disclosed. The length measuring instrument includes a scale, which defines a division, and a scanning unit. The scale is connected to a first object and the scanning unit is connected to a second o... | 01/08/1985 |
| 4477726 | Position measuring apparatus utilizing flexible steel band containing grid divisions A digital electric position measuring apparatus shielded by a flexible covering band. The covering band is held against an elongated carrier body to form a protective seal. A scanning component, movable along the carrier body, lifts the covering band from... | 10/16/1984 |
| 4474430 | Leading mark An instrument for marking leading lines, comprising a front screen and a behind screen (1,2,15,16), which include opaque lines (3) separated by transparent interstices (4), whereby an interference pattern, a so-called moire pattern, arises when viewing th... | 10/02/1984 |
| 4448531 | Displacement measuring instrument In a displacement measuring instrument comprising a case having a substantially enclosed construction, a fixed scale solidly secured to the case, a spindle abutted at the forward end thereof against an object under measurement and reciprocated due to a di... | 05/15/1984 |
| 4389962 | Optical display unit for pneumatic systems An optical display unit for pneumatic systems, having a housing with a transparent cover at one end. A mirror part is provided from which light may be shut off by a moving shutter acted upon by a change in pressure, for example an increase in pressure, in... | 06/28/1983 |
| 4320578 | Measuring instrument mounting apparatus A mounting apparatus for a length measuring instrument for having a housing, a scale, and a scanning unit that scans the scale includes a first mounting element for rigidly attaching one end section to the housing to a mounting surface, a flex element con... | 03/23/1982 |
| 4302109 | Position encoders An encoder for accurately determining the position of one body relative to another consists of an optical mask carried by one body which moves through the focal point of a concave reflector carried by the other body. The reflector produces an image of the... | 11/24/1981 |
| 4297033 | Incremental photoelectric measuring device An incremental photoelectric measuring device is described including a measuring scale having a line grid and a scanning plate having a line grid, wherein the grid spacings of the two line grids are unequal such that one is an integral multiple of the oth... | 10/27/1981 |
| 4286871 | Photogrammetric measuring system An electro-optical measuring system in a photogrammetric comparator or stereocompiler comprises a visible light transparent phase grating which is carried upon a surface of the photo support plate of the device. The grating is formed as a composite layer ... | 09/01/1981 |
| 4273448 | Measuring method and apparatus This invention relates to method and apparatus for improving the accuracy of optical or electrical position measuring apparatus wherein movement of one object relative to another is measured. One known system employs primary and secondary windings each co... | 06/16/1981 |
| 4245912 | Device such as an instrument for optically, preferably visually, determining a definite plane A parallelepiped box is provided with three screens of parallel opaque lines, forming a definite plane, separated by transparent interspaces, and with a mirror behind the screens to direct ambient light from an opening in the top of the box through the sc... | 01/20/1981 |
| 4242000 | Arrangement at screens intended to give rise to a moire pattern An arrangement and structural cross section of grid lines in screens which present a moire pattern. The cross-sections of the screen lines are arranged so that light from behind the screen is not reflected on the front of the grid lines and the moire patt... | 12/30/1980 |
| 4198757 | Fastening apparatus for longitudinal measuring system In a measuring instrument for measuring or adjusting the relative position of two objects, including a measuring scale, a movably mounted sensor housing unit and an elongated hollow body which is resistant to bending and encloses the measuring scale and t... | 04/22/1980 |
| 4189840 | Scanning unit A scanning unit is provided which is adapted for translation in a longitudinal direction along three guide surfaces defined by a length measuring device. The preferred embodiment of this scanning unit includes at least one set of bearings which is adapted... | 02/26/1980 |
| 4190366 | Refractively scanned interferometer An interferometer, preferably of the Michelson type, is disclosed, in which the reflectors associated with the interferometer arms are stationary, and scanning is accomplished by displacement of a single wedge-shaped refractive element in one of the arms.... | 02/26/1980 |
| 4184262 | Device for determining the exact position of two members linearly displaceable relative to each other An apparatus is disclosed for determining the position of one of a pair of linearly displaceable members relative to the other, including a scale secured to one member parallel with the axis of linear displacement, and an electrooptical scanning head conn... | 01/22/1980 |
| 4170828 | Error correction apparatus for longitudinal measuring instrument An error correction apparatus adapted for use with a longitudinal measuring instrument is disclosed. In the preferred embodiment the correction apparatus is mounted on a measuring instrument having a longitudinal scale, a scanning unit movable along the s... | 10/16/1979 |
| 4170826 | Longitudinal measuring device with longitudinally displaceable scale A longitudinal measuring device is disclosed which includes a flexible scale mounted inside a tubular member. The tubular member defines a groove having overhanging flanges on each side of the groove and the scale is positioned inside the groove. The widt... | 10/16/1979 |
| 4169316 | Vibration resistant measuring device A vibration resistant measuring device is disclosed of the type which includes a scale and a scanning unit which is guided along the scale. This device includes a compensating mass connected to the scanning unit to counteract and reduce the tendency of th... | 10/02/1979 |
| 4166699 | Device for optic, preferably visual determination of a certain plane A device or planoscope for determining a certain plane through the use of a change in an angle of bands of a moire interference pattern. The device may have several sets of screens of opaque lines separated by transparent lines. Each set of screens has a ... | 09/04/1979 |
| 4165564 | Encapsulated measuring device An encapsulated measuring device is described which includes a hollow body, a scale defining a measuring direction, and a sensing unit disposed to move along the scale within the hollow body. An entrainment member is pivotably secured to the sensing unit ... | 08/28/1979 |
| 4160328 | Segmented longitudinal measuring device A segmented longitudinal measuring device is disclosed which includes a plurality of hollow tubular housing segments. Inside each housing segment is mounted an intermediate support member which in turn serves as a mounting surface for a measuring scale se... | 07/10/1979 |
| 4149319 | Positioning apparatus An apparatus for maintaining a positioning force on movable parts within a guide means, such as a scanning carriage mounted within a hollow body in an incremental measuring system. The positioning apparatus includes a leaf spring for mounting a pressure r... | 04/17/1979 |
| 4125025 | Instrument for measuring the amplitude of vibration of a vibrating object An instrument for measuring the amplitude of vibration of a vibrating object consists of a first optical system for periodically projecting the image of a grating onto the vibrating object and second optical system having an optical axis intersecting that... | 11/14/1978 |
| 4074131 | Apparatus for measuring or setting two-dimensional position coordinates The invention contemplates a system of two-dimensional grid markings for use in accurate two-coordinate identification of the instantaneous relative position of two closely spaced parallel surfaces, one of which may be on a slide-mounting base or plate, a... | 02/14/1978 |
| 4070759 | Sealed incremental measuring device having an articulated fastening means for mounting the housing A photoelectric incremental longitudinal measuring instrument is disclosed in which a measuring graduation and a displaceable photoelectric sensor housing unit are enclosed in an elongated hollow body resistant to bending to screen the measuring graduatio... | 01/31/1978 |
| 4051367 | Measurement apparatus In an apparatus for measuring relative displacement between first and second members, a grating fixed relative to the first member is illuminated by means defining a spatially periodic optical object fixed relative to the second member. Light transmitted ... | 09/27/1977 |
| 4049965 | Measurement apparatus In an apparatus for measuring relative displacement between first and second members, a grating fixed relative to the first member is illuminated by means defining a spatially periodic optical object fixed relative to the second member. Light transmitted ... | 09/20/1977 |
| 4047585 | Scale optical detector with spring constant variation compensator An optical detection system for a spring scale includes an apparatus for generating a moire interference fringe pattern and detecting the pattern movement to measure scale tare deflection and thereby determine the load weight. One of a pair of ruled paral... | 09/13/1977 |
| 4037161 | Ratio detector An electro-optical device for generating data signals representing relative displacement between an aperture pattern in a reference plane and a reflective pattern in a measurement plane comprises a reference detector for sensing reference radiation direct... | 07/19/1977 |
| 3951548 | Electro-optical fourier vernier device An electro-optical device for generating data signals representing relative displacement between an aperture pattern in a reference plane and a reflective pattern in a measurement plane comprises a reference detector for sensing reference radiation direct... | 04/20/1976 |
| 3942895 | Linear digital readout assembly for milling machines and the like and means for mounting same A linear digital readout assembly for milling machines and the like and structure for mounting the same to the machine, comprising a preassembled, prealigned scale and reading head assembly, with the scale and reading head, respectively, carried by adjace... | 03/09/1976 |
