Systems and techniques for scanning-beam display are provided to use local dimming on the optical energy of at least one optical beam to minimize the non-uniform image brightness across the screen. This local dimming during the beam scanning can be achieved by adjusting optical energy of at least one optical beam during the scanning based on (1) the location of the scanning optical beam and (2) the predetermined distortion information at the location.

A multi-spectral scan camera and methods are presented. Light beams are emitted from a plurality of light sources comprising a plurality of spectral wavelengths respectively. The light beams from the light sources are scanned across a field of view at a plurality of respective angles using a scan mirror, and each of the spectral wavelengths are received at respective detectors.

A light scanning apparatus, including: a light source configured to emit a light beam; and a rotary polygon mirror configured to deflect the light beam emitted from the light source so that the light beam scans a surface of a photosensitive member, wherein the rotary polygon mirror is formed in a four-sided polygon, and wherein a difference between a pair of diametrically opposed interior angles of the rotary polygon mirror is larger than 0.03°, and a difference between another pair of diametrically opposed interior angles of the rotary polygon mirror is 0.03° or less.

A lighting device comprises a light source defining a central axis and comprising at least two mutually independently operable lighting elements. The lighting device further comprises a rotatable deflective member rotatably mounted about said axis, and a fixed deflective member fixedly mounted on said axis and comprising at least two mutually differently deflective portions which each are associated with a respective lighting element. The lighting device of the invention enables various operation modes, like light beam rotation can rotate, jumping of the light beam from one location to another by a sequence of switching on and off one or more of the at least two lighting elements, or in that it can be dimmed or boosted, for example dimmable in steps by a sequence of one by one switching off the lighting elements.

An autonomous vehicle includes a LIDAR system that includes a waveguide array, a collimator configured to receive a plurality of beams from the waveguide array and output a plurality of collimated beams, and a scanner configured to adjust a direction of the plurality of collimated beams. The vehicle also includes one or more processors configured to determine a range to an object based on a return signal received from reflection or scattering of the plurality of collimated beams by the object and to control operation of at least one of a steering system or the braking system based on the range.

Device (100) for reading coded information, comprising a first optical group (10) including a first light source and first focusing means in optical alignment with said light source along an optical axis (X), and at least one further optical group including a further light source and further focusing means in optical alignment with the further light source along an optical axis (X1) parallel to the optical axis (X). The first optical group (10) and the further optical group (20) are housed in a single one-piece block (50) obtained through a single mechanical processing that, preferably, is a machine tool processing. The number of components of the reading device is thus reduced and the calibration operations necessary to achieve the desired optical alignment between light sources and with the respective focusing means are simplified and automated. Consequently, the costs of material and qualified workers are reduced, as is the time needed to calibrate the reading device.

In one example, a method of fabricating a polygon assembly of a Light Detection and Ranging (LiDAR) module is provided. The method comprises: forming, on a backside surface of a first silicon-on-insulator (SOI) substrate, a multi-facet polygon of the polygon assembly; forming, on a frontside surface of the first SOI substrate, an axial portion of a support structure of the polygon assembly, the axial portion forming a stack with the polygon along a rotation axis; forming, on a frontside surface of a second SOI substrate, a plurality of radial portions of the support structure; forming, on a backside surface of the second SOI substrate, a cavity that encircles the plurality of radial portions; and bonding, based on a wafer bonding operation, the axial portion to the plurality of radial portions to form the polygon assembly.

In one example, a Light Detection and Ranging (LiDAR) module is provided. The LiDAR module comprises a semiconductor integrated circuit comprising a micro-electromechanical system (MEMS) formed on a surface of a silicon substrate, and a controller, the MEMS comprising a polygon assembly, the polygon assembly comprising: a polygon; a support structure connected to the polygon and forming a stack with the polygon along a rotation axis; a plurality of anchors formed on the surface of the substrate; and a plurality of actuators, each actuator of the plurality of actuators being connected between the support structure and an anchor of the plurality of actuators. The controller is configured apply a voltage across each actuator of the plurality of actuators, wherein the voltage causes each actuator to exert a torque on the support structure to rotate the polygon around the rotation axis by a target rotation angle.

In an example, a method includes determining a first scaling to be applied to a first print operation and a second scaling to be applied to a second print operation. Each print operation includes selectively removing charge from a charged photoconductor by irradiating the photoconductor in a plurality of scans, forming a first print agent pattern on the photoconductor and delivering the first print agent pattern to a substrate. If the first and second scalings are different, a control instruction may be determined to change the scan-to-scan spacing between the first and second print operations.

A scanline curvature correction mechanism includes a holding mechanism to extend in a main scanning direction and hold an optical element in the main scanning direction , a pressing member provided near a center of the optical element in the main scanning direction and press the optical element of the optical scanning device in the sub-scanning direction, and a curvature adjustment mechanism provided on an opposite side of the pressing member with the optical element interposed therebetween and to adjust a curvature of the optical element in the sub-scanning direction. The curvature adjustment mechanism includes an eccentric cam to rotate around a rotation axis parallel to an optical axis of the optical element and include a cam portion of which an outer peripheral surface is eccentric with respect to the rotation axis, and a fixing mechanism to stepwisely fix an angular position of rotation of the eccentric cam.