A calibration system includes: an exposure head support part that supports an exposure head so that a beam for exposure is incident on an exposure region on the substrate at the time of exposure; a sensor unit including an optical sensor; a sensor unit support part that supports the sensor unit so that, at the time of exposure, a light-receiving surface of the optical sensor is parallel to an exposure surface in the exposure region and the sensor unit support part is installed slidably relative to the exposure head support part; a movement mechanism that moves the exposure head support part and the sensor unit support part; and a control part that moves, at the time of calibration, the exposure head support part and the sensor unit support part so as to arrange the light-receiving surface at a position corresponding to the exposure surface.

The micromirror device includes: a pair of connecting portions that have a thinner thickness than a fixed frame; and four piezoelectric sensors in each of which a shape and a position of an upper electrode are in a line-symmetrical relationship about a first axis and a second axis. In a case where a stretching direction of the connecting portion is a first direction, a direction orthogonal to the first direction and located in a plane is a second direction, and a length of a boundary between the fixed frame and the connecting portion in the second direction is denoted by H, at least a part of each of the four piezoelectric sensors is within a range of H/2 in the second direction from an axis parallel to the first direction, out of the first axis and the second axis, and is disposed on the fixed frame.

Multi-polygon, vertically-separated laser scanning apparatus and methods are disclosed. An example apparatus includes a multi-polygon. The multi-polygon includes a first polygon, a central axis, and a second polygon. The first polygon includes a first plurality of outwardly-facing mirrored facets. The second polygon includes a second plurality of outwardly-facing mirrored facets angularly offset about the central axis relative to the first plurality of outwardly-facing mirrored facets. The second polygon is positioned relative to the first polygon along the central axis. The first and second polygons are rotatable about the central axis.

Provided are a beam scanning device and a system including the beam scanning device. The beam scanning device includes: a spatial light modulator configured to modulate a phase of a light for a corresponding pixel of a plurality of pixels; and a phase mask including a support plate arranged in an output direction of the light that is output from the spatial light modulator and a plurality of nanostructures arranged on the support plate differently for each of the plurality of pixels to control the phase of the light.

An optical scanning device includes a light source and a beam detector for taking a main scanning start time of a light beam emitted from the light source and deflection-scanned by a deflection-scanning component to a predetermined main scanning direction. On the light source and the beam detector, the emission side of the light source and the light receiving side of the beam detector face the light-incident side of an fθ lens, which is longer in the main scanning direction. The light source is arranged on the upstream side in the main scanning direction and the beam detector is arranged on the downstream side in the main scanning direction, or the beam detector is arranged on the upstream side in the main scanning direction and the light source is arranged on the downstream side in the main scanning direction.

Optical scanner and electrophotographic image forming device are provided. The optical scanner includes a light source; and a first optical unit, a deflection apparatus, and an f-θ lens, which are sequentially arranged along a primary optical axis direction of a light beam emitted from the light source. The light beam emitted from the light source is focused onto a scanning target surface after sequentially passing through the first optical unit, the deflection apparatus, and the f-θ lens. Optical scanning directions of the light beam emitted from the light source include a primary scanning direction and a secondary scanning direction which are perpendicular to each other, and along the primary scanning direction, the f-θ lens satisfies following expressions: SAG1>0, SAG2>0, and 0<(SAG1+SAG2)/d<0.8.

An image forming apparatus includes a photosensitive member and a scanning unit including a light source, a rotatable polygonal mirror, and a sensor. The image forming apparatus includes setting of an operation in a first mode and setting of an operation in a second mode. The image forming apparatus further comprises, a surface identifying portion and a correction data storing portion configured to prestore correction data including first correction data for a first rotational speed and second correction data for a second rotational speed. Positional deviation in a main scan direction of laser light is corrected on the basis of the first correction data or the second correction data.

A display system includes a display screen, a light source to generate a light beam to be modulated in accordance with image data, and a beam scanning module to receive the light beams and to direct the light beam onto an associated display region of the display screen. The beam scanning module includes a resonant scanning mirror configured to scan the light beam along a first scanning direction across the associated display region, and a polygon scanning mirror to scan the light beam along a second scanning direction across the associated display region.

Provided is a scanner system includes a laser scanner and a remote controller thereof. The remote controller includes a guide light transmitting unit. The laser scanner includes a guide light receiving unit for detecting the guide light transmitting unit. The laser scanner directs the optical axis of distance-measuring light to the guide light transmitting unit based on a light reception signal and set a data exclusion range with reference to the direction of the guide light transmitting unit. The laser scanner re-measures point cloud data of the data exclusion range in accordance with a measurement permission from the remote controller upon measuring point cloud data of an entire measurement range, and deletes the point cloud data of the data exclusion range from the point cloud data of an entire measurement range, and replacing the deleted data with remeasured point cloud data to acquire entire point cloud data.

A light detection and ranging system is provided. The system includes a Galvanometer mirror; a multiple-facet light steering device; and a controller device comprising one or more processors, memory, and processor-executable instructions stored in memory. The processor-executable instructions comprise instructions for receiving a first movement profile of the Galvanometer mirror of the LiDAR scanning system; receiving calibration data of the multiple-facet light steering device of the LiDAR scanning system; generating a second movement profile of the Galvanometer mirror based on the calibration data and the first movement profile; and providing one or more control signals to adjust movement of the Galvanometer mirror based on the second movement profile.