A distance measuring device includes a deflecting mirror configured to reflect transmission waves, and a swing motor configured to swing the deflecting mirror round a swing shaft so that scanning with the transmission waves is performed within a predetermined scanning region. The swing motor is configured to swing the deflecting mirror within a range of a predetermined rotation angle from a reference position, which is a rotational position of the deflecting mirror that reflects the transmission waves in a direction to a substantial center of the scanning region. The deflecting mirror is configured to return to the reference position when a distance measuring process, in which scanning with the transmission waves is repeated, ends.

A double-bearing position encoder has an axle stabilized within a housing via two bearings disposed on opposite walls of the housing. The axle is in communications with a rotating cam. The cam actuates a pulser so as to generate an active pulse at a tissue site for analysis by an optical sensor. The axle rotates a slotted encoder wheel or a reflective encoder cylinder disposed within the housing so as to accurately determine the axle position and, hence, the active pulse frequency and phase.

A rotation detection device includes a housing that accommodates a rotating body, a detected part that rotates integrally with the rotating body, a detection part that faces the detected part in an axial direction with an axial gap interposed therebetween, an installation member on which the detection part is installed, a female screw portion that is provided in one of the housing and the installation member, and a male screw portion that is provided in the other of the housing and the installation member and screwed into the female screw portion.

A retaining device for coupling an encoder unit of a rotary encoder to an electric machine includes an end shield having a guide groove for receiving an encoder module of the encoder unit, and a retaining ring including a first coupling element for mechanically coupling the retaining ring to the end shield, with the first coupling element being embodied as a hole. A fastening screw is received in the hole to mechanically fasten the retaining ring to the end shield. A shielding element is integrally formed on the retaining ring for shielding against an external interference field.

A pulley serving as a rotary body and a scale configured to rotate integrally with the pulley are attached to an end portion of the pulley serving as the rotary body in a thrust direction, a detection unit is configured to detect rotation of the pulley serving as the rotary body by reading a reading region of the scale. An absorber capable of absorbing liquid is attached to a surface of the scale on which a reading region is present, and when liquid adheres to the scale, the absorber absorbs the liquid.

A rotary encoder includes a stator and a shaft having a bearing configuration arranged in a housing. The shaft is rotatable relative to the housing via the bearing arrangement, and a rotor is attached to the shaft. A strain sensor arrangement, attached to the housing, is adapted to determine a malfunction of the bearing configuration. The housing has a flexible structure that facilitates transmitting forces associated with the bearing configuration to the strain sensor arrangement. The strain sensor arrangement is adapted to detect tension and/or compression associated with the housing, and a malfunction of the bearing configuration is determined based on the detected tension and/or compression.

The application provides an angular displacement measuring device, which uses an absolute linear grating ruler to measure angular displacement, including an absolute linear grating scale with absolute tracks, two opposite ends of the linear grating scale are connected to form a ring, which ring is tightly wound on a motor shaft, a first read head and a second read head positioned in two different positions along the circumference of the ring, for reading a track value on the ring and sending the track value to a data processing unit. The application also provides a method for measuring angular displacement of the motor shaft using the aforementioned angular displacement measuring device.

An angle measuring device includes first and second component groups and a bearing. The first component group includes a scale element having first and second graduations. The second component group has a first modular unit, having a position sensor, a second modular unit, having first to sixth position transducers, and a compensation coupling. To determine the relative angular position between the component groups, the first graduation is scannable with the aid of the position sensor. Using the first to third position transducers, the first graduation or a further graduation disposed on the scale element is scannable to determine a displacement of the scale element in a plane. Using the fourth to sixth position transducers, the second graduation is scannable to determine tilting of the scale element about a tilting axis, the position sensor being situated in a torsionally stiff but axially and radially flexible manner relative to the position transducers.

An optical reflective component and an optical encoder using the same are disclosed. The optical reflective component includes a main body, an optical pattern, a first attaching portion and a second attaching portion. The main body has a first central axis and a reflective surface perpendicular to each other. The optical pattern is disposed on the reflective surface and centered at the central axis. The first attaching portion is centered at the first central axis of the main body and extends from the man body in a direction parallel to the first central axis. The first attaching portion has an inner wall. The second attaching portion has a plane perpendicular to the first central axis. The plane is connected to the inner wall. The main body, the first attaching portion and the second attaching portion are formed of a metal material and are integrally formed with the optical pattern.

A rotary encoder for a valve comprises a rotatable code plate and an optical detector module comprising one or more optical detectors. The code plate defines a set of voids arranged along a set of one or more concentric circular arcs about an axis of rotation. The voids define an angle-dependent pattern over the set of arcs, the pattern comprising a plurality of distinct sectoral elements (A-O, X). At least two of the sectoral elements, located in non-adjacent sectors of the code plate, are identical, but the pattern is non-repeating over a single full rotation of the code plate about the axis. Each optical detector is aligned with a respective concentric circular arc of the code plate. A controller processes time-varying output signals from the optical detectors to determine successive positions of the rotatable code plate.