A stroke sensor is provided with two disk-shaped rotors configured to rotate with a stroke of a measuring object, a rotation detecting unit that detects rotations of the two rotors, respectively, and a stroke position detecting unit that detects the stroke position of the measuring object based on the rotations of the two rotors detected by the rotation detecting unit. At least one of the two rotors is in direct contact with the measuring object. The two rotors are provided side by side in an arrangement direction perpendicular to an axial direction of the measuring object and are provided so as to be adjacent to the measuring object in an arrangement perpendicular direction perpendicular to the axial direction and the arrangement direction. Each of the two rotors is provided in such a manner that its rotation axis direction is inclined with respect to the arrangement direction.

A steering device for a vehicle, the steering device including: a rack housing unit; a rack drive unit inserted into the rack housing unit and configured to be movable in an axial direction; a casing unit coupled to the rack housing unit; a rotary unit mounted in the casing unit and configured to engage with the rack drive unit and be rotatable; and a detection unit mounted on the casing unit and configured to measure a rotation of the rotary unit, thereby implementing a degree of shape freedom and simplifying an assembly structure.

A draw wire sensor which measures distance. The draw wire sensor comprising: a reel, shaft or axle; a wire wound up on the reel, shaft or axle; and a rotational sensor coupled to the reel, shaft or axle. A rotation angle of the sensor is transformed into an electrical signal and the rotational sensor utilizes the tunnel magnetoresistance effect.

A linear system includes a linear unit and a motor adapted to drive the linear unit so as to perform a linear movement. A system for detecting the position of the linear unit includes an absolute encoder which is connected to the motor. The absolute encoder is configured so as to detect a position of the linear unit based on a movement of the motor.

A rotational position detection device includes: a rotary body including first and second magnet pairs respectively including first and second permanent magnets and third and fourth permanent magnets which have polarities different from each other and are arranged adjacent to each other in a predetermined rotation direction; and a sensor pair including first and second magnetic sensors adjacent to each other in the predetermined rotation direction and configured to output different output signals for detection of magnetic fields having different polarities. The rotational position detection device is configured to detect first and second facing positions where the first and second magnetic sensors respectively face the first and second permanent magnets and the third and fourth permanent magnets by a combination of the output signals.

The disclosed device comprises a manually-actuated micro positioning stage that incorporates a mechanism for measurement and electronic output of the stage slider position. A Hall Effect sensor device is used to sense rotary position of the lead screw. based on the lead screw pitch. Processor means converts the Hall Effect sensor measurement of the lead screw rotational displacement into linear displacement of the stage slider for presentation on an electronic display. A magnetically-permeable cap contains a small disc magnet that is poled diametrically and is affixed to the end of the lead screw that is in contact with the stage slider by means of a sensor housing. The Hall Effect sensor contained in a surface mount electronic package is enclosed in a sensor housing that is part of the stage slider that is in contact with the lead screw and is positioned coaxially with the lead screw.

Positioner assemblies may be configured to sense at least one position of at least a portion of a valve assembly that is moved along a first axis of movement. A movable element of the positioner assembly is configured to rotate about a second axis of movement, where the first axis of movement is substantially parallel to the second axis of movement. Valve systems and methods of sensing a position of a component of a valve system may include such a positioner assembly.

One object is to calculate the position of a rod of a linear actuator with a high precision. The linear actuator includes a rod capable of moving in an axial direction relative to a housing. The rod is moved by rotation of an output shaft of a motor. A position sensor for sensing the relative position of the rod relative to a preset reference position is provided in the housing. A rotation sensor for sensing the rotation angle of the output shaft of the motor is provided in the vicinity of the motor. The linear actuator includes a position calculating unit for calculating the position of the rod based on a position sensing value of the position sensor and a rotation angle sensing value of the rotation sensor.

Positioner assemblies may be configured to sense at least one position of at least a portion of a valve assembly that is moved along a first axis of movement. A movable element of the positioner assembly is configured to rotate about a second axis of movement, where the first axis of movement is substantially parallel to the second axis of movement. Valve systems and methods of sensing a position of a component of a valve system may include such a positioner assembly

A drug delivery device comprising: a housing; a cylindrical member rotatably supported within the housing; and a plurality of sensors; wherein: the outer surface of the cylindrical member is provided with a single track, the track forming an encoder and having a plurality of first track segments and a plurality of second track segments arranged along the length of the track which are respectively capable of inducing first and second responses in the sensors; and in each rotational position of the cylindrical member relative to the housing at least one different first track segment is capable of inducing a first response in at least one said sensor, thereby enabling the rotational position of the cylindrical member relative to the housing to be determined.