A position transducer capable of accurately detecting an n-bit code by a small number of ABS detectors when there is provided one ABS track. In an ABS head, the ABS detectors 10.sub.1 to 10.sub.n+m are disposed for a distance .lambda..sub.1 between the first ABS detector 10.sub.1 and (n+m)th ABS detector 10.sub.n+m to satisfy a requirement (n-1).lambda.+2.delta.<.lambda..sub.1 and a distance .lambda..sub.2 between two successive ones of the ABS detectors to satisfy a requirement 2.delta.<....

A position detector includes a position indicator. Transmission/reception of electromagnetic waves relative to the position indicator is performed at least twice while the same loop coil is being selected. With a counter circuit and a switch circuit, a phase difference less than or equal to one cycle of a resonant frequency fO is added to a signal in each transmission/reception. The phase of a reception signal generated at the loop coil is adjusted, and the phase-adjusted signal is used as a det...

A position sensor for sensing linear or radial position, including at least four magnets, a first ferrous plate having at least two of the at least four magnets located at spaced locations along the first ferrous plate, the at least two magnets being oriented such that a north pole of at least one of the at least two magnets is directed toward the first ferrous plate and a south pole of an other of the at least two magnets is directed toward the first ferrous plate, a second ferrous plate having...

The present invention provides a position sensor which is suitable for use in a piston and cylinder assembly. The position sensor includes a movable field modifying member which is operable to vary the inductance of a sensor winding, whereby the position of the field modifying member relative to the sensor winding can be determined by monitoring the inductance of the sensor winding. The position sensor also includes a compensation winding which is arranged to have a common coupling with the fiel...

A compact position and velocity transducer having a high speed resolution and a fast speed response and that does not place much demand on the precision of the bearings. The transducer includes an optical encoder that, when assembled in motors, is assembled on a short protruding part of the rotor close to the torque-creating parts. The optical incremental encoder signals are fed both to a moderate frequency digital counter that counts 4 counts per basic encoder period and to an A/D-converter tha...

When an adjustment switch is turned on, the input of an input changeover switch is switched from a lens controller to a test signal generating circuit. A motor operates in accordance with a test signal of a step waveform outputted from the test signal generating circuit, and a lens moves forward and backward. At this time, a CPU receives a position signal of the lens from a potentiometer to read a response waveform of the position signal responsive to the test signal, and adjusts a feedback gain...

A transducer for detecting position in three generally orthogonal directions has a base unit (10), a mobile unit (20) and a hollow elongate arm (6) which is fixed to the base unit and is angularly movable relative to the base unit such that in use it extends generally towards the mobile unit. A variable length coupling line (4) coupling the base unit to the mobile unit passes through the guide arm and thus measurement of the angular position of the guide arm and the extended length of the coupli...

In a method for position coding, positions are coded in a first dimension on a surface in accordance with a primary number sequence that has the property that the place in the primary number sequence of each partial sequence of a first predetermined length is unambiguously determined. Each position in the first dimension is coded by one of the partial sequences. The primary number sequence is built up of at least two secondary number sequences that have a smaller base than the base of the primar...

A low cost x-y digitising system is provided 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.

There is provided a position transducer (1) capable of accurately detecting an n-bit code by n ABS detectors from one ABS track. When an INC value is under j or over k, signal output from each of the ABS detectors is binarized based on a threshold h and also based on a threshold l. First, an ABS value decider (24) decides that a bit is "H" when it has been judged as being "H" on the basis of both the thresholds and a bit is "L" when it is has been judged as being "L" on the basis of both the thr...