A position controller has a command generator for generating position instructions, a position control unit for controlling a position by inputting a position instruction and the position of a motor being an object to be controlled, and outputting a speed instruction so that they become coincident with each other, a speed control unit for controlling a speed by inputting a speed instruction and a speed of the motor and outputting a torque instruction so that the speed instruction and speed becom...

A position sensor including a rotatable shaft, a first threaded member, a second threaded member, at least one magnet, and at least one magnetic flux detection device. The first threaded member is connected to the rotatable shaft. The second threaded member is threadably engaged with the first threaded member. The at least one magnet is connected to the second threaded member. The at least one magnetic flux detection device is positioned to detect a magnetic field from the at least one magnet.

A hinge position sensor comprises first and second members connected together to provide a hinge, and an optical fiber or wave-guide connected between the first and second members to provide a communication link between the first and second members. A laser or LED is coupled to the optical fiber or wave-guide to transmit optical signals between the first and second members and the optical signal is received by a photo-detector. The optical fiber or wave-guide is physically distorted by actuation...

A position detecting apparatus for detecting position of an object disposed in a first space by receiving light from the object with a light receiving element disposed outside said first space, said position detecting apparatus includes an optical system for directing light from the object to the light receiving element, and a first optical element transmitting light from the object, disposed in a partitioning member for partitioning said first space and space outside said first space, wherein s...

To overcome the problem of a low frequency disturbance causing minute vibrations affecting response attributable to the difficulty of adaption to the phase of the vibrations, the present invention provides a position controller, which includes a subtracter for subtracting a motor position signal from a movement position signal to produce an angle-of-twist signal; a high-pass filter for advancing the phase of the angle-of-twist signal; a low pass filter for eliminating only high-frequency compone...

An optical encoder that includes an optical grating and a quadrature optical encoder sensor that move relative to each other. The optical grating includes a first encoder bar and a plurality of second encoder bars, wherein the first encoder bar is optically configured to change an amplitude of an output of the quadrature optical encoder sensor.

A low cost x-y digitising system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitiser includes a resonant stylus, an excitation winding for energising the resonant stylus and a set of sensor windings for sensing the signal generated by the stylus, from which the x-y position of the stylus is determined. A novel stylus design is described together with novel digitiser windings and novel excitation and...

One embodiment of a position and time-at-position logging apparatus includes a GPS receiver, a microprocessor, memory, a keypad and a data port. The apparatus receives GPS signals and determines therefrom position and time-at-position information of the apparatus, and logs the information in memory in response to a key depression in a manual mode of operation, or in response to a data capture signal in an automatic mode of operation. The data port may be connected to an input device for generati...

A position detector for use with a code carrier which defines a position and has alternating radiation transmissive and non-transmissive regions which define a multi-bit output is disclosed. The position detector includes a photodetector array mounted on one side of the code carrier and a radiation source mounted on the detector on the side opposite the photodetector array. A radiation guide is interposed between the code carrier and the photodetector array and has a plurality of radiation trans...

Apparatus utilized in combination with a carriage reciprocating between a primary base position and a second position spaced away from the primary base position. The apparatus varies the distance of the second position of the carriage from the primary base portion of the carriage and includes a stop surface on the carriage and a plurality of secondary stop surfaces operatively associated with the carriage stop surface. The secondary stop surfaces are each movable between at least two operative p...