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.

An image forming apparatus includes an exposure device configured to form a latent image on a photoreceptor. The exposure device includes a polygon mirror motor, a polygon mirror pre-incidence optical system, a post-scan optical system, and a housing. The polygon mirror pre-incidence optical system includes a light source station configured to emit the light beam. The post-scan optical system is configured to irradiate the photoreceptor with the light beam. The housing includes a first holding portion, a second holding portion, and a slit. The slit is formed between the first holding portion and the second holding portion. The slit is configured to separate the first holding portion and the second holding portion in a region corresponding to a gap between the light source station and the polygon mirror motor.

In one embodiment, a lidar system includes a light source configured to emit light at one or more wavelengths between 1200 nm and 1400 nm. The lidar system also includes a scanner configured to scan the emitted light across a field of regard of the lidar system and a receiver configured to detect a portion of the emitted light scattered by a target located a distance from the lidar system. The lidar system further includes a processor configured to determine the distance from the lidar system to the target based at least in part on a round-trip time for the portion of the emitted light to travel from the lidar system to the target and back to the lidar system.

A polygon mirror rotates around a rotational axis. First and second reflection surfaces are placed on at least two of a plurality of sides of the polygon mirror, respectively. The first surface is formed in a planar shape inclined to a plane perpendicular to the rotational axis. The second surface is formed in a planar shape inclined with respect to a plane perpendicular to the rotational axis. Light which enters into the mirror is reflected by the first surface and then by the second surface. Among the sides, at least one of a direction in which the first surface is inclined with respect to a plane perpendicular to the rotational axis and a distance in the direction of the rotational axis between the first and second reflection surfaces is different.

A polygon scanner (10) for detecting objects (24) in a monitored zone (22) is provided having a light transmitter (12); having a light receiver (30); having an evaluation unit (32); and having a rotatable mirror unit (20) for a periodic deflection of the light beam (16) that has a plurality of mirror facets (34) in order thus to scan an angular section multiple times per rotation of the mirror unit (20) by a respective mirror facet (34), wherein at least some of the mirror facets (34) have a different curvature from one another. In this respect, at least one of the mirror facets (34) is configured as a free-form surface whose curvature is adapted to the angle of incidence of the transmitted light beam (16) on the mirror facet (34) that varies during the rotation of the mirror unit (20).

An apparatus configured to fly a light-absorbing material, includes a unit configured to irradiate a light-absorbing material absorbing light with a laser beam corresponding to a light absorption wavelength of the light-absorbing material to fly the light-absorbing material. When a preceding beam radiation region and a following beam radiation region overlap, the following beam radiation region is irradiated with the laser beam such that a beam centroid position is outside the preceding beam radiation region.

An additive manufacturing apparatus includes a platform, a dispenser configured to deliver a plurality of successive layers of feed material on a platform, a light source configured to generate a light beam, an auxiliary polygon mirror scanner configured to receive the light beam from the light source and reflect the light beam, and a primary mirror scanner to receive the light beam reflected by the auxiliary polygon mirror scanner and direct the light beam to impinge on an exposed layer of feed material.

High speed laser scanning systems and methods are disclosed for imaging target samples. Embodiments of the laser scanning systems and methods include separating a laser beam into two or more different pathways and pulsing light along the two or more pathways. The different pathways intersect the surface of a moving mirror at different locations and light traveling in a pathway that is being approached by an edge of the moving reflective surface is turned off while light traveling in a different pathway that is farther from the edge of the moving reflective surface is turned on. Embodiments include reflective surfaces that form a rotating polygonal scanner. Further embodiments include recombining the two or more different pathways, focusing the laser light on a test sample, and imaging the light reflected from the test sample.

A sensor comprises two independently rotatable elements. The first element comprises facets in a polygonal configuration fully rotatable about a first axis at a first angle relative to a source's beam axis and redirects energy incident on a facet at a second angle to a facet plane at a reflected angle equal in magnitude to the second angle as the first element is rotated. The second element may be a wedge mirror fully and independently rotatable about a second axis at a third angle to the beam axis that redirects energy at a fourth angle to the second axis, in a direction within the FOV, receives reflected energy to the first element for redirection toward an element interposed between it and the source that allows the source energy to pass unimpeded, and on to a detector. Correlating data from the detector and the source determines the target range.

A laser radar includes: a base member; a drive part configured to rotate the base member about a rotation axis; and a plurality of optical units arranged on the base member at a predetermined interval in a circumferential direction about the rotation axis and each configured to project laser light in a direction away from the rotation axis. Here, projection directions of the laser lights from the plurality of optical units are different from each other in a direction parallel to the rotation axis.