Abstract: An optical device, includes a light-transmitting substrate (20) having an input aperture and first and second major surfaces (26, 32) parallel to each other and edges, one partially reflecting surface located in the substrate which is non-parallel to the major surfaces of the substrate and an external optical arrangement having an output aperture for coupling light into the substrate by total internal reflection. The optical arrangement for coupling light having an output aperture optically attached to the input aperture of the substrate with the part of the substrate located next to the substrate input aperture, being substantially transparent.

Abstract: An exemplary video wall includes two display panels and a polygonal mullion elimination lens. Each of the display panels includes a main body and a bezel surrounding the main body. The polygonal mullion elimination lens includes a central first concave surface configured to reflect internal light incident thereon, two flat surfaces respectively attached to the main bodies of the display panels, a central second concave surface opposite to the first concave surface, and two lateral surfaces each connecting between a corresponding one of the flat surfaces and the second concave surface. Portions of light emitted by the main bodies of the display panels can enter the mullion elimination lens via the flat surfaces.

Abstract: A split unit capable of providing a stereoscopic image having less laterality is provided. The split unit includes: a beam splitter which transmits first imaging light as a part of light incident on an incident surface of the beam splitter, and reflects second imaging light as another part of the light incident on the incident surface; and a reflecting member which reflects the second imaging light reflected by the beam splitter. At least one of a reflectance of the reflecting member and a beam splitting characteristic of the beam splitter is set based on the following formulae: T=d/(1+d) R=1?T where T (0?T?1) is a transmittance of the beam splitter, R (0?R?1) is a reflectance of the beam splitter, and d (0?d?1) is a reflectance of the reflecting member.

Abstract: A reading apparatus for assisting a person to read or view reading material, including from a lying down position, with the reading apparatus including in a lying down position. The reading apparatus comprises: an optical system including a tray for supporting the reading material, a reflecting mirror and an imaging mirror, said tray, said reflecting mirror and said imaging mirror being mechanically intercoupled in a manner that enables them to be positioned at predetermined, respective angles relative to each other, to enable the reading material located on said tray to be viewed by viewing an image formed by said imaging mirror. A support is configured to enable the optical system to be positioned in front of the person. The tray, the reflecting mirror and the imaging mirror can be folded onto each other.

Abstract: Various embodiments may relate to a lighting device including at least two light sources, the light from which has different spectra and is combined to form useful light. For measuring the portions of the light from the individual light sources, part of the useful light, the measurement light, is branched off with the aid of a coupling-out element at the output of the lighting device and is fed to a measuring device.

Abstract: The disclosure generally relates to color combiners, and in particular color combiners useful in small size format projectors such as pocket projectors. The disclosed color combiners include at least two tilted dichroic plates having at least two reflectors configured with light collection optics to combine at least two colors of light.

Abstract: A projection apparatus including an image source, an imaging module and a beam splitting module is provided. The image source provides an image beam. The imaging module is disposed on a transmission path of the image beam and has an aperture stop. The beam splitting module is disposed on the transmission path of the image beam and located on or near the aperture stop. The beam splitting module includes a plurality of aperture stop sub-regions, and the beam splitting module separates a plurality of image sub-beams of the image beam irradiating these different aperture stop sub-regions. These image sub-beams respectively propagate towards different directions after travelling to these aperture stop sub-regions.

Abstract: According to certain embodiments, a system includes beamsplitter sets, where each beamsplitter set comprises a first beamsplitter module and a second beamsplitter module aligned with the first beamsplitter module. The first beamsplitter module receives a first beam traveling along a first optical path. The first beamsplitter module splits the first beam into a first output beam transmitted along the first optical path and a first split beam transmitted to the second beamsplitter module along a reflected beam path. The second beamsplitter module receives the first split beam. The second beamsplitter module splits the first split beam into a second output beam transmitted substantially parallel to the reflected beam path and a second split beam transmitted substantially perpendicular to the reflected beam path.

Abstract: An augmented reality electronic head gear is disclosed. The head gear includes an electronic device compartment configured to receive and support an electronic device such as an iPhone®. The head gear further includes a reflective surface configured to reflect the display of the electronic device to the eyes of a user. The head set is configured to rest upon a user's head, keeping the user's hands free and able to interact with the surrounding environment, while the user's eyes view real-time images of the surrounding environment being augmented.

Abstract: A method is provided that includes providing a light source having a light emitting diode (LED) that emits a light. A polarization conversion system (PCS) is located adjacent the LED and has both a linear polarizer and a wave plate. A polarizing beam splitter (PBS) is adjacent the light source and an imaging device is adjacent the PBS. The wave plate of the PCS is rotated to a first position, and a first light is emitted by the LED in the first light source. This first light is converted to circular polarization. This first light travels to the PBS where it is reflected onto the imaging device. The wave plate is then rotated to a second position, and a second light is emitted by the light source. This second light is converted to circular polarization and reflects from the PBS onto the imaging device.

Abstract: A system comprises first and second beamsplitter modules aligned along an alignment line. In certain embodiments, each beamsplitter module can split a beam traveling along a first optical path into a first split beam and a second split beam within a spectral range. Each beamsplitter module can transmit the first split beam along the first optical path and direct the second split beam along a second optical path substantially orthogonal to the first optical path and to the alignment line. In certain embodiments, each beamsplitter module can receive a first beam traveling along a first optical path and a second beam traveling along a second optical path that is substantially orthogonal to the first optical path and to the alignment line. Each beamsplitter module can combine the second beam with the first beam to yield a combined beam and transmit the combined beam along the first optical path.

Abstract: There is provided an optical imaging device for splitting an initial image into images with different optical characteristics, wherein the device comprises a plurality of beamsplitters and at least first and second reflectors arranged to create multiple images adjustably separable in two orthogonal directions, characterised in that the first reflector is rotatable about a first axis and the second reflector is rotatable about a second axis, the second axis orthogonal to the first axis. The beamsplitters are located in a first optical layer to create multiple optical pathways directed substantially orthogonally from the first optical layer to a second spaced apart optical layer. Each reflector can be moved translationally relative to its rotational axis.

Abstract: A solar concentrator device comprising a solar concentrator element comprising a radiation transmissive surface, a radiation absorptive material and a radiation concentrating/collection point and disposed on the incident radiation side thereof a recapture element for recapturing at least a portion of radiation lost from the concentrator element has improved solar radiation collection efficiency by reintroducing recaptured radiation into the concentrator element or by propagating said recaptured radiation through the recapture element to a radiation concentration point associated with the recapture element. It has been found that planar elements having a grooved or corrugated outer surface make for very good recapture elements for planar concentrator elements.

Abstract: A method for producing a mirror plate for a Fabry-Perot interferometer includes providing a base slab, which includes a substrate coated with a reflective multilayer coating, forming one or more intermediate layers on the base slab such that the lowermost intermediate layer substantially consists of silica, and such that the multilayer coating is at least partially covered by the lowermost intermediate layer, forming one or more capacitive sensor electrodes by depositing conductive material on top of the intermediate layers, and removing material of the lowermost intermediate layer by etching in order to form an exposed aperture portion of the multilayer coating.

Abstract: In an optical element, a half mirror layer includes a silver layer, a first dielectric multilayer film that is provided between the silver layer and a first translucent member made of resin, and a second dielectric multilayer film that is provided on the opposite side to the first translucent member with respect to the silver layer. The first dielectric multilayer film includes a first aluminum oxide layer that is in contact with the silver layer, and a titanium oxide layer that is in contact with the first aluminum oxide layer on the first translucent member side. The second dielectric multilayer film includes a zirconium layer (zirconium oxide-based dielectric layer) and a second aluminum oxide layer that is in contact with the zirconium oxide layer, and one of the second aluminum oxide layer and the zirconium oxide layer is in contact with the silver layer.

Abstract: A beam combining device for combining light from a first light source and light from a second light source of a light-source device for a medical apparatus includes a body made of a transparent material, a face which reflects in at least either a dichroic or polarization-dependent manner and is situated in or on the body, which face is transparent to light having a first spectrum or a first polarization and reflects light having a second spectrum or a second polarization, and a light-entrance face on the body, which light-entrance face is provided and arranged so that light enters the beam combining device through the light-entrance face. At least either the light-entrance face or the face reflecting in a dichroic or polarization-dependent manner is curved.

Abstract: This invention provides a system and method for expanding the field of view of a vision system camera assembly such that the field of view is generally free of loss of normal resolution across the entire expanded field. A field of view expander includes outer mirrors that receive light from different portions of a scene. The outer mirrors direct light to tilted inner mirrors of a beam splitter that directs the light aligned with a camera axis to avoid image distortion. The inner mirrors each direct the light from each outer mirror into a strip on the sensor, and the system searches features. The adjacent fields of view include overlap regions sized and arranged to ensure a centralized feature appears fully in at least one strip. Alternatively, a moving mirror changes position between acquired image frames so that a full width of the scene is imaged in successive frames.

Abstract: A mirror assembly includes a mirror pane and a head cap. The mirror pane generally faces a first direction. The head cap has a first region and a second region. The first region generally faces a second direction and the second region generally faces a third direction. The first region and the second region may both be formed from transparent materials. The first region is substantially covered by a first coating having a first reflectance and a first transmittance. The first reflectance is less than one hundred percent and the first transmittance is greater than zero, such that light passes through the first region and the second region and is visible from the interior of the vehicle.

Abstract: A scan lens and an interferometric measuring device using the scan lens are disclosed. The scan lens includes a lens set, a beam splitter, and a reflector disposed between the lens set and the beam splitter. During application the applied light beam passes through the lens set of the interferometric measuring device to fall upon the beam splitter where the light beam that passes through the beam splitter is defined as a first light beam and the light beam that is reflected by the beam splitter is defined as a second light beam. The first light beam is projected onto the test object. The second light beam is projected onto the reflector. The second light beam reflected by the reflector and the first light beam reflected or scattered by the test object will interfere with each other to form interference patterns for measuring the test object.

Abstract: A surface light source device is provided. The surface light source device includes a light source, a beam splitter configured to split a light irradiated from the light source into a plurality of light beams each having a different path, a diffusion unit configured to diffuse the plurality of light beams split by the beam splitter into a surface light, and a collimating unit configured to arrange the plurality of light beams diffused from the diffusion unit in one direction.

Abstract: A display device can have at least one imaging unit and at least one combiner. The location of the imaging unit and/or of the combiner can be provided to be locationally variable. The display device can be used such that information can be represented on a plurality of planes.

Abstract: An eyepiece for a head mounted display includes a light relay body, a total internal reflection (“TIR”) interface, and a focusing lens. The light relay body has a first end coupled to receive CGI light from an image source and a second end including a viewing region from which the CGI light is emitted. The TIR interface is disposed in the viewing region at an oblique angle relative to an eye-ward side of the light relay body through which the CGI light is emitted from the eyepiece. The TIR interface is oriented to redirect the light towards the eye-ward side of the light relay body. The focusing lens is disposed along the eye-ward side of the light relay body in alignment with the TIR interface to bring the CGI light into focus for a near-to-eye arrangement.

Abstract: A waveguide for use in solar power systems to capture sunlight without solar tracking. The waveguide includes a first transparent layer with a first surface receiving sunlight, and the waveguide includes a second surface, opposite the first surface of the first layer, including recessed surfaces (or “microstructures”) each defined by sidewalls extending from the second surface toward the first surface of the first layer. The waveguide includes a second layer of transparent material with a first surface proximate to the second surface of the first layer for receiving a portion of the sunlight transmitted through the first layer. The second layer has a second surface, opposite the first surface, including recessed surfaces of the same or differing shape, size, location, and orientation as those of the first layer. The recessed surfaces of the first and second layers capture sunlight of differing ranges of incidence angles with total internal reflection (TIR).

Abstract: Accurate simulation of sport to quantify and train performance constructs by employing sensing electronics for determining, in essentially real time, the player's three dimensional positional changes in three or more degrees of freedom (three dimensions); and computer controlled sport specific cuing that evokes or prompts sport specific responses from the player that are measured to provide meaningful indicia of performance. The sport specific cuing is characterized as a virtual opponent that is responsive to, and interactive with, the player in real time. The virtual opponent continually delivers and/or responds to stimuli to create realistic movement challenges for the player.

Abstract: A brightness tracking system for an optical device includes a first imager for viewing a target of interest, a second imager for viewing the same target of interest, and a photodiode circuit. The photodiode circuit (a) measures brightness levels of the target of interest received from the first imager, and (b) controls output brightness of the second imager, based on the measured brightness levels received from the first imager.

Abstract: Universal linear components are provided. In general, a P input and Q output wave combiner is connected to a Q input and R output wave mode synthesizer via Q amplitude and/or phase modulators. The wave combiner and wave mode synthesizer are both linear, reciprocal and lossless. The wave combiner and wave mode synthesizer can be implemented using waveguide Mach-Zehnder modulator technology. This device can provide any desired linear transformation of spatial modes between its inputs and its outputs. This capability can be generalized to any linear transformation at all by using representation converters to convert other quantities (e.g., polarization, frequency) to spatial mode patterns. The wave combiner and wave mode synthesizer are also useful separately, and can enable applications such as self-adjusting mode coupling, optimal multi-mode communication, and add-drop capability in a multi-mode system.

Abstract: A source light beam is split into an illumination beam and a highlight beam. The highlight beam can be controllably shaped into a shaped highlight beam based on a brightness analysis of an image to output. The illumination beam and the shaped highlight beam are combined and provided to an imaging device that generates the image using the combined beam. An array of reflectors, such as a MEMS mirror device, can be used in conjunction with a stacked rod array to generate the shaped highlight beam. The illumination beam and the shaped highlight beam can be combined using offset lenses or a polarizing beam splitter.

Abstract: An integrated apertured micromirror is provided in which the micromirror is monolithically integrated with a micro-optical bench fabricated on a substrate using a lithographic and deep etching technique. The micromirror has an aperture therein and is oriented such that the micromirror is optically coupled to receive an incident beam having an optical axis in a plane of the substrate and to at least partially transmit the incident beam therethrough via the aperture.

Abstract: A projector is provided, including a first light source, a second light source, a splitting unit, a first modulating element, a second modulating element, a projection lens unit, a projection screen and a combining unit. The first light source provides a first beam in a first state. The second light source provides a second beam in a second state. The splitting unit receives the first beam and the second beam, splitting the first beam into a first sub-beam and a second sub-beam, and splitting the second beam into a third sub-beam and a fourth sub-beam. The first modulating element receives the first sub-beam and the third sub-beam from the splitting unit. The second modulating element receives the second sub-beam and the fourth sub-beam from the splitting unit. The combining unit respectively combines the first sub-beam and the second sub-beam, and combines the third sub-beam and the fourth sub-beam.

Abstract: A multi-band refractive optical imaging system. In one example, the system includes a plurality of lenses configured to receive and propagate electromagnetic radiation in at least the visible spectral band and the longwave infrared (LWIR) spectral band, the plurality of lenses including a first group of lenses of a first crown material, at least one lens of a first flint material, and at least one lens of a second material different than the first crown material and the first flint material. The plurality of lenses includes at least one crown-flint pair configured as an achromat to provide color correction in the visible and/or LWIR spectral bands. The system also includes a first beamsplitter configured to separate the electromagnetic radiation into the visible spectral band and the LWIR spectral band, and a rear external aperture stop positioned between the plurality of lenses and the first beamsplitter.

Abstract: An optical submount has a circumscribed 4-faced depression on its bottom surface and a 3-faced depression at an edge of its bottom surface. An optical signal is transmitted through a face of the 3-faced depression and internally reflected from a face of the 4-faced depression. A set of additional depressions and intervening areas on the submount bottom surface act as an alignment mark.

Abstract: A light source comprises a light combining device for guiding incident light from a first light emitting source (310) and incident light from a second light emitting source (340) with different incident directions to combine two paths of incident light into one path of emission light emitted from a first optical path. The light combining device comprises a guide part (330), for guiding light from the second light emitting source (340) to converge into the first optical path, and hindering a part of light from the first light emitting source (310) from entering the first optical path, the luminous flux of the hindered part of the light being less than the luminous flux of light from the first light emitting source (310) entering the first optical path.

Abstract: Waveguide array optical power splitters that provide compact, low-cost implementation of optical power splitting for one and two dimensional optical waveguide arrays are disclosed. The optical power splitters do not introduce mode dependent loss and preserve polarization, enabling the optical power splitters to be used with multimode and single mode light sources. In one aspect, an optical power splitter includes a beamsplitter to receive a plurality of incident beams of light. The beamsplitter splits each incident beam of light into a plurality of output beams of light with each output beam output in a different direction from the beamsplitter. The optical power splitter includes a first set of lenses with each lens to approximately collimate one of the incident beams of light, and includes a second set of lenses with each lens to focus the output beams of light.

Abstract: A virtual image display system includes a display device that outputs image light, a projection lens that projects the image light from the display device, a first holding member that holds the projection lens, a light guide plate that takes in the image light from the projection lens, and then, guides the light to an external predetermined position, and a second holding member that holds the light guide plate. A positioning structure for positioning the light guide plate with respect to the projection lens is provided in the first holding member and the second holding member.

Abstract: A microscope includes an objective optical system including an imaging optical system configured to form an image of an object, a re-imaging optical system configured to re-form an image of the object image formed by the imaging optical system, and a reflection unit arranged on an optical path between the imaging optical system and the re-imaging optical system and configured to be locally changeable in at least one of a position thereof in an optical axis direction and an inclination thereof relative to an optical axis, and an image sensor configured to capture the image re-formed by the objective optical system.

Abstract: Method for actuation control of a microscope, in particular of a Laser Scanning Microscope, in which, at least one first illumination light, preferably moving at least in one direction, as well as at least one second illumination light moving at least in one direction, illuminate a sample through a beam combiner, a detection of the light coming from the sample takes place, whereby, at least one part of the illumination light is generated through the splitting of the light from a common illuminating unit, characterized in that, by means of a common control unit, a controlled splitting into the first and the second illumination light takes place, in which the intensity of the first illuminating light, specified by the user or specified automatically, is assigned a higher priority (is prioritized) compared to the specified value for the second illumination light, and an adjustment for the second illumination light takes place until a maximum value is obtained, which is determined by the value specified for the f

Abstract: A lens array includes a first lens row including first lenses arranged in a first direction, a second lens row including second lenses arranged in a direction substantially parallel with the first direction, a first boundary being a boundary between the first lenses adjacent to each other, a second boundary being a boundary between each of the first lenses and the second lens adjacent to the first lens, and a first join portion where the first boundary and the second boundary join each other. At the first joint portion, the first boundary and the second boundary contact each other with no step as seen in a plane that is substantially orthogonal to the first direction.

Abstract: An optical element includes a waveguide, a polarizing beam splitter film, and a deflector. The waveguide propagates light incident at a predetermined angle while reflecting the light between first and second planes. The polarizing beam splitter film is adhered to the first plane of the waveguide. The polarizing beam splitter film separates light incident from the waveguide into transmitted light and reflected light. The deflector is joined to the waveguide with the polarizing beam splitter film therebetween. The deflector has a plurality of first reflecting surfaces. The first reflecting surfaces reflect, in a direction substantially perpendicular to a surface of the polarizing beam splitter film, light transmitted by the polarizing beam splitter film. The polarizing beam splitter film reflects the majority of light incident at a predetermined angle from the waveguide and transmits a majority or all of the light incident in a substantially perpendicular direction from the deflector.

Abstract: The present invention relates to a fiber laser system for processing materials involving a system of interconnected operational components for combining and optionally distributing beams from multiple beam emitters. More particularly, the present invention provides a system for combining and distributing fiber laser beams having different wavelengths and a method for operating the system thereof. Multiple beam combiners may be optionally linked with a beam distribution system. In exemplary use, multiple fiber laser sources generating different wavelength outputs are combined in a single beam incident of a work piece comprising multiple layers.

Abstract: An optical system has an aperture through which virtual and real-world images are viewable along a viewing axis. The optical system may be incorporated into a head-mounted display (HMD). By illuminating a viewing location with an infrared light source, an eye pupil may be illuminated. Infrared light is reflected from the viewing location and is collected with a proximal beam splitter. An image former is configured to reflect at least a portion of the visible light pattern generated by the display panel to form the virtual image and transmit at least a portion of the collected infrared light. The transmitted infrared light may be imaged by a camera. The HMD may use images from the camera to provide, for example, context-sensitive virtual images to a wearer.

Abstract: A beam shaping device, consists of a polarization beam splitter interface (PBS interface), four light surfaces and at least one light processing surface, as well as various entities are described. The PBS interface passes light in P polarization and reflects light in S polarization; two of the four light surfaces are light I/O surfaces, and the other two of them are light surfaces for processing (LSFP); the light processing surface is arranged and oriented to retro-reflect, or close to retro-reflect light beam coming from said PBS interface and back it to where it comes from, and, in the meantime, physically rotate the reflected light beam around its propagating direction by 90°, or close to 90°. The invention works for light beam in any polarization status including non-polarized beam.

Abstract: A luminous flux branching element includes a transparent base member arranged diagonally to an optical axis and having an incidence plane and an emission plane parallel to each other. Incident light from the incidence plane is split into a main luminous flux emitted from an emission position on the emission plane and a branched luminous flux emitted from a branch position apart from the emission position and having a smaller light quantity than of the main luminous flux. A reflecting member is arranged on the incidence plane to cause the incidence plane to reflect reflected light from the emission plane. A non-coat region in which antireflection-treatment is not performed is formed in a region of the emission plane where the incident light from the incidence plane is reached, and antireflection-treatment is performed in the emission plane excluding the non-coat region and the incidence plane.

Abstract: An exemplary video wall includes two display panels and a polygonal mullion elimination lens. Each of the display panels includes a main body and a bezel surrounding the main body. The polygonal mullion elimination lens includes a central first concave surface configured to reflect internal light incident thereon, two flat surfaces respectively attached to the main bodies of the display panels, a central second concave surface opposite to the first concave surface, and two lateral surfaces each connecting between a corresponding one of the flat surfaces and the second concave surface. Portions of light emitted by the main bodies of the display panels can enter the mullion elimination lens via the flat surfaces.

Abstract: A laser pulse stretching unit is described herein which has one or more nested optical delay paths. In addition, a method for using the laser pulse stretching unit is also described herein.

Abstract: A beamsplitter that includes a first prism including an input face, an output face and an oblique face and a second prism including an output face and an oblique face, the oblique face of the second prism being coupled to the oblique face of the first prism. A polarizing coating is sandwiched between the oblique face of the first prism and the oblique face of the second prism, and a linear polarizer coupled to at least one of the output face of the first prism and the output face of the second prism.

Abstract: A near-eye display system includes an image former and first and second series of mutually parallel beamsplitters. The image former is configured to form a display image and to release the display image through an exit pupil. The first series of mutually parallel beamsplitters is arranged to receive the display image from the image former. The second series of mutually parallel beamsplitters is arranged to receive the display image from the first series of beamsplitters, and to release the display image through an exit pupil longer and wider than that of the image former. The second series of beamsplitters has a different alignment and a different orientation than the first series of beamsplitters.

Abstract: A multi-band refractive optical imaging system. In one example, the system includes a plurality of lenses configured to receive and propagate electromagnetic radiation in at least the visible spectral band and the longwave infrared (LWIR) spectral band, the plurality of lenses including a first group of lenses of a first crown material, at least one lens of a first flint material, and at least one lens of a second material different than the first crown material and the first flint material. The plurality of lenses includes at least one crown-flint pair configured as an achromat to provide color correction in the visible and/or LWIR spectral bands. The system also includes a first beamsplitter configured to separate the electromagnetic radiation into the visible spectral band and the LWIR spectral band, and a rear external aperture stop positioned between the plurality of lenses and the first beamsplitter.

Abstract: In various embodiments, an optical element may include: a first planar base area; and a second planar base area; wherein the first base areas and second base areas do not lie in a same plane; wherein the first base area has a coating, which is designed to reflect or transmit an electromagnetic wave according to a predefined criterion; wherein the predefined criterion concerns a property of the electromagnetic wave which is different from an intensity; wherein a surface structure is arranged at the second base area of the optical element, said surface structure being formed integrally with the base area; and wherein the surface structure is designed to shape an intensity profile of a light beam impinging on the surface structure of the optical element.

Abstract: There is provided an optical imaging device for splitting an initial image into images with different optical characteristics, wherein the device comprises a plurality of beamsplitters and at least first and second reflectors arranged to create multiple images adjustably separable in two orthogonal directions, characterised in that the first reflector is rotatable about a first axis and the second reflector is rotatable about a second axis, the second axis orthogonal to the first axis. The beamsplitters are located in a first optical layer to create multiple optical pathways directed substantially orthogonally from the first optical layer to a second spaced apart optical layer. Each reflector can be moved translationally relative to its rotational axis.

Abstract: Described herein is a projective optical metrology system including: a light target formed by a first number of light sources having a pre-set spatial arrangement; and an optical unit including an optoelectronic image sensor, which receives a light signal coming from the light target and defines two different optical paths for the light signal towards the optoelectronic image sensor. The two optical paths are such that the light signal forms on the optoelectronic image sensor at most an image of the light target that can be processed for determining at least one quantity indicating the mutual arrangement between the light target and the optical unit.