A flying spot scanner is used to expose a photosensitive surface to an intensity modulated beam of light to build up an image on the photosensitive surface. Such a scanner includes a position sensor comprising an elongate grating (14), means to take part of the beam of light from the scanning head (8) of the flying spot scanner and apply it to the grating (14) so that it scans in a direction along the grating, the rulings of the grating forming an oblique angle with the direction of scanning of ...

A position measuring device includes a conventional encoder, a scale member and an index member together arranged to provide two periodic waveforms of the same frequency and in quadrature with one another. Errors in the waveforms are corrected, and the corrected waveforms used to produce an indication of the position represented by the waveforms. The two positional indications are combined to give a high-resolution output. The conventional encoder may be absolute or incremental, and the device m...

Photodiodes are situated in a row over a line segment having a predetermined width. Current generated by at least one of the photodiodes is converted into voltage by a resistor. This voltage is amplified by first MOSFETs that are connected at drains thereof in parallel to a source of voltage with a resistor between the adjacent two thereof. This voltage is amplified by second MOSFETs that are connected at drains thereof in parallel to the source of voltage. The first MOSFETs produce a first outp...

A detector for detecting movements which, in its simplest form of embodiment, has one exciter magnet: (EM) and only one individual pulse wire (FE) with one induction coil (SP1) and with a sensor (SP2, HS) for determining polarity and position of the moveable exciter magnet (EM). All information is simultaneously determined at the time (T.sub.s), that the ferromagnetic element (FE) is triggered and remagnetized by said magnet (EM). For counting operation a further information about the last estab...

A position switch is disclosed, with a plunger. In at least one embodiment, the plunger can be moved, via an actuator, from a rest position to an operating position by way of a first rotatable locking element. A second rotatable locking element is usable to block the first rotatable locking element by way of the plunger. A position switch is specified, which separates the actuating mechanism for a switch unit from the holding-shut mechanism and, in doing so, guarantees reliable holding-shut, whi...

The invention relates to a position sensor including at least two sensor units which measure in a contactless manner a position x of an element which is movably arranged relative to the sensor units. Using limited circuitry, the invention precludes sources of errors during the processing of the sensor signals in that from the sensor signals there is formed a measuring signal from the phase position of which relative to the clock signal there can be determined the position x. The position x may b...

A sensor failure detection circuit for a position encoder, the sensor failure detection circuit receiving from a first set of at least one position sensor position signals which change state at a high resolution and from a second set of at least one position sensor position signals which change state at a lower resolution, the detection circuit monitoring a count for the position signals at the high resolution between states of the position signals at the lower resolution and comparing the count...

A position indicator for use in an input coordinate device for providing a desired coordinate point on a position detecting plane, comprises a chassis having both a pen shaped portion formed by a substantially cylindrical portion and a mouse portion including a flat bottom; a first indicating circuit, disposed within the pen shaped portion, including a core body having an end extending externally from the pen shaped portion and a first switch; a second indicating circuit, disposed within the mou...

A position determining system for determining a position of a rotor of a rotating motor has sensors that are coupled to the rotor. The sensors generate, in response to a rotation of the rotor, a quadrature signal that has sine and cosine components. The position determining system calculates a sum (A.sup.2) of a squared value of the sine component (A.sup.2sin.sup.2x) and a squared value of the cosine component (A.sup.2cos.sup.2x). An amplitude correction factor (A) is calculated as the squared r...

A measuring-cable position sensor is provided in a pressure tight, in particular explosion protected manner, wherein all functional elements besides the cable drum and the measuring cable are located in a pressure tight housing, which is stable enough, so that also in case of an explosion in the interior of the pressure-tight housing section no ignition spark can get through the gaps of the housing to the outside.