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.

In some embodiments, a LIDAR system may include at least one processor configured to control at least one light source for projecting light toward a field of view and receive from at least one first sensor first signals associated with light projected by the at least one light source and reflected from an object in the field of view, wherein the light impinging on the at least one first sensor is in a form of a light spot having an outer boundary. The processor may further be configured to receive from at least one second sensor second signals associated with light noise, wherein the at least one second sensor is located outside the outer boundary; determine, based on the second signals received from the at least one second sensor, an indicator of a magnitude of the light noise; and determine, based on the indicator the first signals received from the at least one first sensor and, a distance to the object.

In an optical scanning device, an outer wall closest to a circumscribed circle of a rotating polygon mirror has a space in a position facing to a position of a reflection surface of the rotating polygon mirror in an axial direction of a rotating shaft. A part of a cover is provided in a position farther from the circumscribed circle than the outer wall so as to close the space, when the optical scanning device is viewed in a direction perpendicular to the axial direction of the rotating shaft.

An optical emitter device includes an emitter array comprising a plurality of end-fire tapers, each end-fire taper configured to selectively emit a respective beam of light. A lens system is configured to shape and direct each beam of light based on a position of the respective end-fire taper relative to an optical axis of the lens system. A rotating reflector, including an axis of rotation perpendicular to the optical axis of the lens system, is configured to redirect and scan the beams of light through a scanning range.

An image forming apparatus with accurate color shift correction with consideration of a change in a rotational speed of a driving portion of a laser scanning member includes a light source, the laser scanning member, a driving portion, a speed controlling portion, a light detecting portion, a light source controlling portion, a scanning lens, a housing, a temperature gradient detecting portion, a first temperature detecting portion, and a correction processing portion. The temperature gradient detecting portion detects a temperature gradient in the housing. The first temperature detecting portion detects a temperature of the scanning lens. The correction processing portion corrects an emission start timing at which light corresponding to a line of image data is emitted from the light source, based on the temperatures detected by the temperature gradient detecting portion and the first temperature detecting portion, the rotational speed of the driving portion, and a preset arithmetic expression.

A mechanically resonant system exhibits a resonant mode frequency response. A conductor is included on a resonant member within the mechanically resonant system. A current in the conductor causes a modification of the resonant mode frequency response when in the presence of a magnetic field. The modification of the resonant mode frequency response may include an offset in the natural frequency of the mechanically resonant system.

Provided are a polygon mirror assembly and a scan device. A polygon mirror assembly includes: a polygon mirror including a plurality of reflection surfaces spaced apart from a rotation axis by a predetermined distance; a first motor for rotating the polygon mirror around the rotation axis; a second motor for moving the polygon mirror in a first axial direction such that the rotation axis is tilted while the first motor rotates the polygon mirror; and a clock signal extraction surface for extracting a clock signal for detecting a change in a rotational speed of the first motor.

A scanner for a lidar system is configured to direct emitted light to scan a field of regard of the lidar system in accordance with a scan pattern. The scanner includes a mirror and an actuator assembly. The mirror includes a reflective surface and a rear surface and is pivotable along a mirror axle. The actuator assembly is disposed along the rear surface of the mirror and is configured to exert a torque on the mirror to cause the mirror to pivot about the mirror axle.

A scanning device includes a motor and a mirror attached to the motor and configured to reflect emitted light of a light source. The scanning device is configured to scan probe light, which is reflected light reflected by the mirror, according to the rotation of the motor. A photosensor detects return light, which is light reflected from a point on an object. A processor detects the distance to the point on the object based on the output of the photosensor. A distance measurement sensor changes the angular resolution according to the distance to the object.

Controlling a mirror in a MEMS based projector. A method includes iteratively performing various acts. The method includes inputting a time domain target wave array, with target elements, to a system for a MEMS coupled to the mirror of the projector. The time domain target wave array includes a set of n target elements. The method further includes driving the driver to move the mirror using elements in a drive array comprising a set of drive elements. The method further includes sampling a time domain output wave for the movement of the mirror to construct an output wave array with output elements corresponding to the target elements. The method further includes identifying errors between the target elements and the output elements. The method further includes modifying the drive elements in the drive array to attempt to minimize the errors when driving the MEMS on subsequent drive cycles.