1
Clement Frank John, Richardson Barton Leigh: Coordinate detection system. Bell Telephone Laboratories Incorporated, October 9, 1973: US3764813 (111 worldwide citation)

In a coordinate detection system, the interruption of pulsed invisible light beams is used to determine the spatial coordinates of a passive stylus, such as a finger or a pencil, relative to an associated display. The system comprises a rectangular frame which houses two mutually perpendicular linea ...


2
Cronin David V: Linear encoder immune to scale bending error. Dynamics Research Corporation, December 14, 1971: US3628026 (108 worldwide citation)

A linear encoder in which scale bending error does not materially affect encoder performance. An elongated generally rectangular encoder scale is provided having a plurality of alternately light responsive and opaque segments on one surface thereof and a plurality of similar segments on an opposite ...


3
Jones William M: Motor control apparatus adapted for use with a motorized vehicle. Cleveland Machine Controls, June 4, 1974: US3814199 (95 worldwide citation)

Motor control system for controlling both direction and speed of a DC motor. The system is particularly applicable for controlling direction and speed of a pair of DC reversible motors which independently drive spaced apart wheels on a vehicle, such as a motorized wheelchair. Motor speed is controll ...


4
Shaw Herbert John: Sensor using fiber interferometer.. Univ Leland Stanford Junior, October 26, 1983: EP0092367-A2 (72 worldwide citation)

A closed loop optical fiber interferometer is used in sensing a quantity, Q, by applying a time varying or modulated measure of, Q, asymmetrically to the closed loop (24) and detecting phase shift between two counterpropagating optical signals in the closed loop. The closed loop (24) can be used as ...


5
Cunniff John: Coded fiducial.. Hughes Aircraft Co, June 9, 1993: EP0545737-A1 (69 worldwide citation)

An optically detectable fiducial marker that utilizes a predetermined multi-bit binary coded pattern to provide levels of detectability and spatial resolution not found in conventional fiducials. The fiducial marker has a capture range equal to the length of a predetermined multi-bit binary coda uti ...


6
Walters Glenn A: Precision angle measuring device. January 2, 1973: US3708231 (69 worldwide citation)

A device for the precision measuring of angular movements. The device incorporates an optical lever utilizing a predetermined number of reflections to increase the displacement of a light beam to be read out by discrete sensors. Ambiguities resulting from the amplification of displacement are resolv ...


7
Giuliani David, Gutcheck Robert Allen: Optical fiber distribution system for an optical fiber sensor.. Abbott Lab, January 31, 1990: EP0352631-A2 (67 worldwide citation)

A device for distributing signals within a sensor system used for monitoring the presence of a specific analyte in a composition by means of an analyte-sensitive indicator molecule is disclosed. The sensor includes a signal-generating component, a single-fiber sensor tip that houses the indicator mo ...


8
Wieg Heinrich J: Apparatus for measuring displacement between two relatively movable members. Goodale Eugene C, June 11, 1974: US3816002 (56 worldwide citation)

A measuring apparatus for detecting relative movement between a fixed object and a movable object is disclosed. The measuring apparatus comprises a transducer guided on a grating tape slidably mounted within a housing. The housing is connected to one of the relatively moving members. The transducer ...


9
Babsch Alfred, Beth Dieter, Panzer Werner, Stempfle Johann Dipl Ing Fh: Device for the digital control of a machine or apparatus, especially of a matrix printer.. Mannesmann, December 27, 1985: EP0165378-A1 (52 worldwide citation)

Die Ist-Geschwindigkeit des zu regelnden Antriebsmotors wird durch Inkremental-Sensoren abgetastet. Diese erzeugen Signale zum Aktualisieren von Positionszählern, aufgrund deren Zählerstand der Antriebsmotor in nachfolgenden Steuerimpulsreihen korrigiert wird. Um ein genaues Mess- bzw. Steuer- bzw. ...


10
Rorden Robert J, Williams Gerald Hunter: Apparatus for detecting the position of a moving or modulated light beam. Coherent Radiation, Limbach Limbach & Sutton, July 8, 1975: US3894230 (49 worldwide citation)

An aligned array of photo-detecting devices, where each photo-detecting device corresponds to an increment in position, senses a pulsed light beam or a moving light beam which defines a reference plane. The output from an activated photo-detecting device is coupled to a numerical read-out display wh ...