Abstract: A system and method for adaptively illuminating a volume with an illumination system that illuminates a volume of interest using separately controllable near field and far field optimized illumination sources, to maintain an irradiance pattern criteria in the volume, where that criteria may be different for a far field portion of the volume than for a near field portion of the volume.

Abstract: A receiving device includes an optical detector, a first detection region, and a second detection region. The optical detector detects a position of an object of interest to be detected by receiving, with use of one or more of light-receiving portions, reflected light that occurs when light emitted from one or more of light-emitting portions is reflected by the object of interest to be detected. The first detection region is provided at a position closer to the optical detector, and is for detecting movement of the object of interest to be detected with the use of the optical detector. The second detection region is provided at a position farther from the optical detector than the first detection region, and is for detecting presence of the object of interest to be detected with the use of the optical detector.

Abstract: A bonding apparatus configured to bond substrates includes a first holder configured to vacuum-exhaust a first substrate to attract and hold the first substrate on a bottom surface thereof; a second holder disposed under the first holder and configured to vacuum-exhaust a second substrate to attract and hold the second substrate on a top surface thereof; a rotator configured to rotate the first holder and the second holder relatively; a moving device configured to move the first holder and the second holder relatively in a horizontal direction; three position measurement devices disposed at the first holder or the second holder rotated by the rotator and configured to measure a position of the first holder or the second holder; and a controller configured to control the rotator and the moving device based on measurement results of the three position measurement devices.

Abstract: A system for monitoring a condition of a pan line associated with a longwall mining system includes multiple pan segments arranged in a successive manner. Adjacently located pan segments are moveably coupled by an interconnecting joint. An underside of each pan segment defines an opening whose axis is parallel to a plane of the associated pan segment. The system also includes a fiber optic shape sensing system that has a fiber optic cable disposed along the multiple pan segments and located within the opening of each pan segment. A controller coupled to the fiber optic cable detects a shape of the fiber optic cable, identifies a position of each pan segment based on the detected shape of the fiber optic cable, and determines if a fault exists in the interconnecting joints between adjacently located pan segments based on the identified positions of respective ones of the adjacently located pan segments.

Abstract: A method of calibrating a laser measurement device includes positioning a calibration part, having known geometric specifications, at varying distances from the laser measurement device (within a measurement depth-of-field of the laser measurement device). The detected geometric specifications, measured at these different positions, are compared with the known specification(s) of the calibration part in order to improve the accuracy of the calibration. A calibration standoff fixture having a plurality of adjustable legs may be used in conjunction with the method to facilitate changing the position of the calibration part relative to the laser measurement device.

Abstract: An electronic pen includes: a communication unit which communicates with a communication target apparatus; a state detection unit which detects a state of the electronic pen decided by a relation with the communication target apparatus; and a control unit which changes an operation of the communication unit according to the state detected by the state detection unit.

Abstract: A positioning apparatus including a moveable member moveable along a bearing guideway in a first dimension, the moveable member including at a first end thereof at least first and second bearing members which are preloaded against corresponding first and second sides of a concave corner of the bearing guideway.

Abstract: An illumination device configured to illuminate an imaging target, an image of which is to be captured by a camera, provided with a current adjusting device configured to adjust a current flowing through the LEDs of four LED-mounted boards on which many of the LEDs are mounted, wherein the four LED-mounted boards are arranged in a four-sided shape centered around the light axis of the camera as viewed from the imaging target, and each of the LED-mounted boards is inclined at a specified angle so that the LEDs of the LED-mounted boards face the imaging target. The current adjusting device is configured to divide an LED-mounted area of each of the LED-mounted boards into multiple illumination areas and to individually adjust the current flowing to the LEDs of each of the LED-mounted boards for each of the multiple illumination areas.

Abstract: A device for a 3D measurement of object coordinates of a measurement object or parts of the measurement object in a coordinate measuring machine is provided. The device includes at least one illumination device configured to generate at least one illumination light beam and to illuminate the measurement object, at least one lens, wherein the lens has a longitudinal chromatic aberration, at least one color sensor arranged in an image plane of the lens, wherein the color sensor is configured to capture a measurement light beam generated by the measurement object in response to the illumination light beam and to determine at least one spectrally dependent image space content; at least one evaluation unit configured to determine at least one item of depth information from the spectrally dependent image space content.

Abstract: Systems and methods track objects within an operating room. A machine vision system includes at least one camera and a machine vision controller. A navigation system includes a camera unit including a plurality of sensor arrays. The sensor arrays include a plurality of sensing elements. For each of the plurality of sensor arrays, the navigation system identifies a first subset of the plurality of sensing elements to be active based on the position of the object and a second subset of the plurality of sensing elements to be inactive based on the position of the object. The navigation processor is also configured to track a movement of the object within the operating room using the first subset of the plurality of sensing elements while preventing the use of the second subset of the plurality of sensing elements.

Abstract: A test system includes a semiconductor die and an integrated optical/electrical probe card. Electrical, optical, and optoelectronic devices reside in the semiconductor die. Electrical pads in the semiconductor die connect to the electrical and optoelectronic devices. Grating couplers in the semiconductor die connect to the optical device and optoelectronic devices. The electrical pads and grating couplers are interspersed in substantially a single line in the semiconductor die. The integrated optical/electrical probe card interfaces with the electrical pads by electrical needles, and concurrently interfaces with the grating couplers by optical fibers.

Abstract: A shading system creates a shaded region on a structure, enabling 3D scanning techniques that rely on light detection to generate a 3D model. The shading system includes a vehicle or device that moves the shading system into place. A light, such as a laser dot or line, can be projected onto the shaded region of the structure and detected by a 3D scanner.

Abstract: Various arrangements for assessing an installation of a smart home device are presented. An orientation of the smart home device may be analyzed to determine whether the orientation of the smart home device is unsuitable for one or more features of the smart home device to function properly. An indication of whether the orientation of the smart home device is unsuitable may be output, such as by the smart home device using voice or lighting.

Abstract: A clutch system configured to transmit torque between an input shaft and an output shaft. The clutch system includes a clutch. The clutch includes: an input portion disposed at an end of the input shaft; an output portion disposed at an end of the output shaft; a sliding component that slides axially between the input and output portions to engage the clutch; and swirl breaks. The input portion, the output portion, and the sliding component each comprises walls. The swirl breaks are affixed to a one of the walls.

Abstract: A LIDAR unit includes: an LD driver, a laser diode, and a scanner corresponding to an emission unit; a photo detector, a current/voltage conversion circuit, a A/D converter and an valuable segmenter that correspond to a light receiving unit; a landmark position prediction unit and landmark map acquisition unit that acquire position information indicating the position of a landmark on a map; and a synchronization controller that generates a valuable pulse trigger signal and a segment extraction signal. Based on a predicted current vehicle position value and the position of the landmark on the map, the landmark position prediction unit determines a predicted angular range of the landmark. The synchronization controller generates the valuable pulse trigger signal and the segment extraction signal such that the scan density of the light pulse is higher in the predicted angular range than the scan density of the light pulse in the other range.

Abstract: A method comprising receiving control instructions sent from a control device, where the control instructions are configured to instruct a photographing apparatus carried by an unmanned aerial vehicle to perform an image capturing operation; and controlling an indicator light at the unmanned aerial vehicle to indicate an execution status of the control instructions executed by the photographing apparatus.

Abstract: An optical assembly, for receiving light waves, includes a receiving optical system for focusing at least one incoming light wave onto a surface of a detector for detecting the at least one light wave, at least one diffractive optical element with a planar extension being situated between the receiving optical system and the detector, and the at least one diffractive optical element including a surface with a surface structure with at least one optical function. Furthermore, a LIDAR device includes an optical assembly of this type.

Abstract: Photonic integrated circuits including controllable cantilevers are described. Such photonic integrated circuits may be used in connection with other optical devices, in which light is transferred between the photonic integrated circuit and one of these optical device. The photonic integrated circuit may comprise an optical waveguide having an end disposed proximate to a facet of the cantilever. The orientation of the cantilever may be actively controlled in one or two dimensions, thus adjusting the orientation of the optical waveguide. Actuation of the cantilever may be performed, for example, thermally and/or electrostatically. Orientation of the cantilever may be performed in such a way to align the optical waveguide with an optical device.

Abstract: A system and method of generating a two-dimensional image of an environment is provided. The system includes a 2D scanner that comprises a light source, an image sensor and a controller. The controller determines a distance value to at least one of the object points. An inertial measurement unit is coupled to the scanner and has a first sensor. The first sensor has a first characteristic. A mobile computing device is removably coupled to the 2D scanner, the mobile computing device having a second sensor, the second sensor having a second characteristic. Processors are provided that are responsive to compare the first characteristic and the second characteristic and select one of the first or second sensor based on the comparison. The processors are further generate an image of the environment based on a signal from the selected first or second sensor.

Abstract: An imaging lighting device of an appearance inspection device images a product T. A controller of the appearance inspection device causes an imaging control unit to obtain an image, a preprocessing unit to position the product and remove background of the product, a color space processing unit to perform color space processing for emphasizing a defect such as a flaw and a dent of the product and to create a color space processing image, and an assessment unit to make an quality assessment of the product using a learned model obtained through machine learning of quality assessment of the product using the color space processing image.

Abstract: Embodiments of the present disclosure provide a method and an apparatus for detecting a characteristic sequence in a wireless communication system. The method includes: receiving, by a receiving end base station, an original characteristic sequence periodically transmitted by a transmitting end base station; detecting out, by the receiving end base station, a candidate characteristic sequence meeting a preset condition from the original characteristic sequence; determining whether the candidate characteristic sequence is a valid characteristic sequence; and detecting whether there is an associated event based on a preset rule according to the detected valid characteristic sequence. In this way, it is solved the problem that it cannot be guaranteed that the number of characteristic sequences falsely detected is reduced without increasing the missed-detection probability in a scenario of larger number of detections in the prior art.

Abstract: The invention corresponds to wide signal period with simple structure by providing a relative position detection means for optically detecting a relative position of displacement of an object to be measured in a measuring direction. The invention includes a target mounted on the object to be measured and irradiated with light from a light source; a light receiver for detection of a relative position for receiving light by changing polarization state of reflected light at the target with respect to the light; and a relative position information output unit for outputting relative position information based on displacement of the target in the measuring direction. The target may include a reflector mounted on the object to be measured and a plurality of birefringent members provided on the reflector and having a thickness changing from a tip to a base end along the measuring direction.

Abstract: A difficulty of contamination interfering with a grid plate positional measurement system is addressed. In one embodiment contamination is prevented from coming into contact with the grating or the sensor. In an embodiment, surface acoustic waves are used to detach contamination from a surface of the grating or sensor.

Abstract: Described are systems, methods, and apparatus for detecting objects within a distance of an aerial vehicle, and developing a three-dimensional model or representation of those objects. Rather than attempting to use stereo imagery to determine distances and/or depth of objects, the described implementations utilize range-gating, or time-gating, and the known position of the aerial vehicle to develop a three-dimensional representation of objects. For example, when the aerial vehicle is at a first position it may use range-gating to detect an object at a defined distance from the vehicle. The aerial vehicle may then alter its position and use range-gating to detect an object that is the defined distance from the vehicle at the new position. This may be done at several different positions and the resulting information and aerial vehicle position information combined to form a three-dimensional representation of those objects.

Abstract: A 3D camera device able to sense reflected visible light and reflected laser light to create a 3D image of a face or other object includes a laser source, one or more image sensors, and a data processing module. The data processing module obtains two-dimensional coordinates of the target object by processing two-dimensional image signal and obtains depth coordinates of the target object by processing depth image signal of the target object provided by the laser. A method applied to such device is also disclosed.

Abstract: Described herein are a method, apparatus, terminal, and system for measuring a trajectory tracking accuracy of a target. Using each method, apparatus, terminal, and system to measure the trajectory tracking accuracy of the target includes determining a location information of the actual tracking trajectory of the target; comparing the location information of the actual tracking trajectory with a location information of the target trajectory to determine a variance between the location information of the actual tracking trajectory and the location information of the target trajectory; and determining the tracking accuracy of the target based on the variance.

Abstract: An optical measurement method and an optical measurement device for determining the spatial or spatiotemporal distribution of a sample, the sample comprising at least one retransmission source retransmitting light depending on light projected onto the sample according to a predetermined law. The method has steps of projection onto the sample of at least two compact light distributions belonging to different topological families, which propagate along the same optical path; detection of the light retransmitted by said at least one retransmission source of the sample; generation of at least one optical image from the detected light; and algorithmic analysis of the optical images for obtaining location data on said at least one retransmission source.

Abstract: A control device includes a stop command unit for stopping an operation of a robot when a person comes in contact with the robot, and a speed limit unit for limiting the operation speed of the robot. A distance determination value relating to an accident caused by sandwiching a person is predetermined. The speed limit unit includes a model generation unit for generating three-dimensional models of two objects among the component of the robot, a hand, and object arranged around the robot, and a distance calculation unit for calculating the shortest distance between the models of the two objects. When the shortest distance is less than the distance determination value, the speed limit unit controls the operation speed of the robot so that the operation speed is equal to or lower than a predetermined limit speed.

Abstract: A laser scanner which includes a mobile station calculates a two-dimensional fixed station coordinate system formed at least three fixed stations, calculates coordinates of intersections of at least three circles, which have the fixed stations as their centers and the distances between each of the fixed stations and the mobile station as their radii, at every predetermined angle as each positioning result of the mobile station while horizontally rotating the laser scanner by 360° around a mechanical point, averages each of the positioning results corresponding to 360° and calculates approximate mechanical point coordinates in the fixed station coordinate system.

Abstract: A system and process for performing orthopedic surgery is provided that uses a patient's existing implant as a registration tool in an orthopedic surgical procedure. The systems and processes may be used with computer assisted systems or navigation systems to aid in the removal of bone, bone cement, or a bone prosthesis, typically a bone prosthesis used in hip replacement surgery, knee replacement surgery, and the like. The removal of the prosthesis may be done by conventional methods, with navigation systems, robotic assistance or articulating hand held systems. The removal of bone and/or bone cement may be performed with navigated systems, robotic systems, articulating hand-held systems and combinations thereof.

Abstract: A reconfigurable maintenance apparatus includes a body configured to operate within a cavity. The body has a first shape in a first configuration and a second shape in a second configuration. The first configuration facilitates the body entering the cavity. The reconfigurable apparatus also includes at least one maintenance device operably coupled to the body. The second configuration facilitates the at least one maintenance device of the reconfigurable apparatus performing a maintenance operation.

Abstract: A micro-structured organic sensor device which has the following layers oriented in parallel to one another: a substrate layer for supporting the further layers; an organic sensor layer for converting a technical quantity to be detected to an electrical quantity; a first electrode layer for contacting the organic sensor layer on a side of the organic sensor layer facing the substrate layer; a second electrode layer for contacting the organic sensor layer on a side of the organic sensor layer facing away from the substrate layer; and one or several functional layers; wherein the sensor layer is structured such that a plurality of horizontally spaced sensor segments are formed; wherein at least one of the electrode layers is structured such that a plurality of horizontally spaced electrode segments are formed so that at least one of the electrode segments of the respective electrode layer is associated to each of the sensor segments; and wherein the one or several functional layers at least partly fill gaps lo

Abstract: A fiducial marker to be tracked by a surgical navigation system. The fiducial marker is to be affixed to an object during a surgical procedure. The fiducial marker including a casing for attachment to the object; a light emitting component attached to the casing; a power source within the casing; a signal receiver to receive a signal from the surgical navigation system; and control logic to control the light emitting component in response to the signal from the surgical navigation system. The object to-be-tracked may include a plurality of the fiducial markers arranged in geometric pattern, and the markers may include a first active fiducial marker having a first light emitting component that emits light having a first spectral bandwidth, and a second active fiducial marker having a second light emitting component that emits light having a second spectral bandwidth different from the first spectral bandwidth.

Abstract: A handheld hemoglobin detecting device has a housing assembly including a holding base, a tubular housing and a liquid holder, a control module disposed on the housing assembly, and a lighting assembly mounted in the tubular housing and including a light emitting module, a light concentrator, and a light guide. At least one light beam emitted from the light emitting module passes through and is concentrated by the light concentrator to shine on the liquid holder, is reflected by a light reflector that is disposed in the liquid holder, enters the light guide, and is transmitted to a light sensor. The handheld hemoglobin detecting device has a simplified structure and is easy to assemble, and thus is light and has low manufacturing cost. Moreover, a lower accuracy in assembling the lighting assembly can be tolerated.

Abstract: Determining parameters of a patterned structure located on top of an underneath layered structure, where input data is provided which includes first measured data PMD being a function ƒ of spectral intensity I? and phase ?, PMD=ƒ(I?; ?), corresponding to a complex spectral response of the underneath layered structure, and second measured data Smeas indicative of specular reflection spectral response of a sample formed by the patterned structure and the underneath layered structure, and where a general function F is also provided describing a relation between a theoretical optical response Stheor of the sample and a modeled optical response Smodel of the patterned structure and the complex spectral response PMD of the underneath layered structure, such that Stheor=F(Smodel; PMD), where the general function is then utilized for comparing the second measured data Smeas and the theoretical optical response Stheor, and determining parameter(s) of interest of the top structure.

Abstract: To suppress an erroneous measurement of a measuring object in an optical displacement meter of a light sectioning method. The optical displacement meter includes an image sensor, a cover glass arranged obliquely relative to a light receiving surface of the image sensor, and a housing which houses the image sensor and the cover glass.

Abstract: A system for determining positional information of a camera, includes: a plane determination module configured to determine a first plane and a second plane based on a depth image; a plane-association module configured to associate the first plane determined by the plane determination module with a first tool-plane, and to associate the second plane determined by the plane determination module with a second tool-plane, the first and second tool-planes having known positional relationship with respect to each other; and a positional determination unit configured to determine the positional information of the camera based on an output from the plane-association module.

Abstract: A gaze-tracking system for use in a head-mounted display apparatus and an aperture device. The gaze-tracking system includes a first light source and a second light source operable to emit light of first and second type respectively; an image sensor operable to capture an image of the user's eye and reflections of the light of first type from the user's eye; a primary lens; an aperture device positioned between the image sensor and the primary lens, and a processor configured to control the first and second light sources and image sensor, and to process the captured image to detect a gaze direction of the user. The aperture device provides a first aperture to the light of first type and a second aperture to the light of second type, the first aperture and the second aperture being substantially concentric, the first aperture being smaller than the second aperture.

Abstract: A device for measuring radiation backscattered by a sample including: at least one light source that is configured to emit a light beam, along an axis of incidence, towards a surface of the sample so as to form, on said surface, an elementary illumination zone; an image sensor for forming an image of the radiation backscattered by the sample when the latter is illuminated by the light source, the image sensor lying in a detection plane; a bundle of optical fibres, extending, along an extension axis, between a proximal surface and a distal surface, the proximal surface being applied against the image sensor, the distal surface being configured to be applied against the surface of the sample; wherein the light source is arranged around the bundle of optical fibres, and wherein the distance between the light source and the bundle of optical fibres is less than 1 mm.

Abstract: An encoder signal processing device includes a position data acquisition unit, an error data calculation unit that calculates error data in a predetermined number of position data in one cycle, and a compensation unit that compensates the position data based on the calculated error data, in which the error data calculation unit calculates first error data in the predetermined number of position data sampled at first predetermined time intervals ?Tn in one cycle, defines the first error data as the error data, calculates second error data in position data sampled at second predetermined time intervals ?Tk in each of the first predetermined time intervals ?Tn, and changes a time interval of the error data without increasing or decreasing the predetermined number of error data by replacing second error data closest to a local extremum or inflexion point in error characteristics of the first and second error data with the first error data.

Abstract: An image projection system includes a projector and a light pen. The projector includes: an image pickup unit which performs image pickup in a periodically repeated image pickup period and does not perform image pickup in a non-image pickup period; a detection unit which detects a pointed position of the light pen; and an infrared signal receiving unit which receives pointing element information transmitted from the light pen. The light pen includes: a light emitting unit; a control unit; and a storage unit which stores the pointing element information. The light pen performs first light emission in the image pickup period and second light emission corresponding to the pointing element information in the non-image pickup period. The projector detects the pointed position, based on an image of the first light emission picked up by the image pickup unit and receives the pointing element information transmitted via the second light emission.

Abstract: A sensor (10) is provided for detecting an object (20) in a monitored zone (18), having at least one sensor element (36) for detecting a sensor signal; having a switch output (30) for outputting a binary object determination signal; and having an evaluation unit (28) that is configured to generate the object determination signal from the sensor signal in dependence on the detected object (20) and to determine, in a teaching phase, a switching point that determines the association between the sensor signal and the object determination signal. The evaluation unit (28) is further configured to detect a respective sensor signal for a plurality of detection situations in the teaching phase, with the associated object determination signal being predefined for the respective detection situation and with the switching point being derived therefrom.

Abstract: A micro-electro-mechanical systems (MEMS) array system is configured to apply suction forces for the manipulation of objects. The MEMS system includes includes a two-dimensional MEMS array of a plurality of individual MEMS elements. Each MEMS element comprises: a casing structure; a flexible membrane attached to the casing structure; and an electrode structure, wherein a voltage applied to the electrode structure actuates the MEMS element to cause the flexible membrane to flex relative to the casing structure. The flexible membrane and the casing structure define a gap into which the flexible membrane may flex, and a foot extends from the flexible membrane in a direction away from the casing structure, wherein the foot and the flexible membrane define a clearance region on an opposite side of the flexible membrane from the gap. When the MEMS element interacts with an object to be manipulated the foot spaces the membrane apart from the object.

Abstract: A 3D measuring device is provided. The device includes a measuring head with a light transmitter and a light receiver. A control and evaluation device is coupled to the light transmitter and light receiver and determines the distance to the object. An accessory interface allows an accessory device to be mechanically connected to the measuring head and can be electrically connected to the control and evaluation device. The accessory interface includes a receiving section and a contact section. The receiving and contact sections are arranged such that the accessory device can be inserted into the accessory interface in an insertion direction in order to electrically and mechanically couple the accessory device to the accessory interface. A support structure having an integral slot is coupled to the measuring head. The slot has the receiving section for the mechanical connection and the at least one contact section.

Abstract: A distance measurement device includes a projection optical system, a light-receiving system to receive light projected from projection optical system and reflected by an object; and a correction system to correct a difference in timing of light emission between the plurality of light sources. The projection optical system includes a plurality of light sources and a plurality of drive circuits to drive the plurality of light sources.

Abstract: An articulated arm coordinate measuring machine includes a laser line probe. The laser line probe includes a camera that can acquire metrology data and color data. A laser line probe is coupled to a probe end of an articulated arm. The laser line probe having a projector and a camera, the projector being operable to project a line of light at one or more predetermined wavelengths, the camera having a lens assembly optically coupled to a sensor assembly. The sensor assembly has a photosensitive array and a filter disposed between the photosensitive array and the lens assembly. The filter includes a plurality of red, green and blue pixels in a predetermined arrangement. A controller is coupled to the laser line probe and causes the camera to acquire a metrology image and a color image. The controller assigns a color to the three-dimensional coordinate points based on the color image.

Abstract: A target structure, wherein the target structure is configured to be measured with a metrology tool that has a diffraction threshold; the target structure including: one or more patterns supported on a substrate, the one or more patterns being periodic with a first period in a first direction and periodic with a second period in a second direction, wherein the first direction and second direction are different and parallel to the substrate, and the first period is equal to or greater than the diffraction threshold and the second period is less than the diffraction threshold.

Abstract: A wireless laser power transfer system includes, in part, a transmitter and a receiver that form a wireless link. The transmitter, includes, in part, a first communication system, at least a first source of laser beam, and a controller adapted to vary power and direction of the laser beam and further to modulate the laser beam. The receiver includes, in part, a communication system adapted to establish a wireless link with the first communication system, at least a first photo-voltaic cell, and a controller adapted to demodulate and detect the power of the modulated laser beam received by the first photo-voltaic cell from the first source of laser beam. The system optionally includes at least a second source of laser beam controlled by the transmitter controller. The system optionally further includes a second photo-voltaic cell. The transmitter controller is further adapted to cause the second laser beam to strike the second photo-voltaic cell.

Abstract: A method and an associated device for determining the transmittance of a flat-glass substrate with a measuring device, with which light of at least one light source is guided from one side of the flat-glass substrate through the flat-glass substrate to the opposite side of the flat-glass substrate, where it is captured by at least one receiving unit and the transmittance of the flat-glass substrate is determined by means of a comparison between the intensity of the light emitted by the light source and the light incident upon the receiving unit. The light source is a surface-like diffuse light source, and the receiving unit comprises at least one spatially resolving receiver. By evaluating brightness values in the measuring image of the spatially resolving receiver, the transmittance is determined in a spatially resolved manner in a partial surface of the flat-glass substrate, which is covered by the measuring image.

Abstract: A distance measurement device includes a projection optical system, a light-receiving system to receive light projected from projection optical system and reflected by an object; and a correction system to correct a difference in timing of light emission between the plurality of light sources. The projection optical system includes a plurality of light sources and a plurality of drive circuits to drive the plurality of light sources.