Density unevenness occurs in an output image in the scanning direction of a laser beam because the amount of the laser beam reaching the surface of the photoreceptor is different for each position in the scanning direction of the laser beam. The exposure amount (integrated light amount) per unit area on the photoreceptor is controlled to be substantially uniform by controlling the pulse widths of PWM signals according to the exposure positions of the laser beam, based on exposure amount correction data set according to the positions of the laser beam in the scanning direction.

An optical scanning device that scans a photoreceptor with light, the device includes: a light emitter that emits light according to a supply current amount; a source-side optical system that includes an optical element corresponding to the light emitter, the optical element transmitting and shaping the light emitted from the corresponding light emitter; a polygon mirror that cyclically deflects the light shaped by the source-side optical system; an image-side optical system that condenses the light deflected by the polygon mirror on a surface of the photoreceptor; a motor that rotates the polygon mirror; and a light source controller that: monitors a temperature of the optical element; and adjusts the supply current amount for the light emitter or adjusts the temperature of the optical element corresponding to the light emitter to make a temperature difference between the light emitter and the corresponding optical element fall within an allowable range.

A laser scanner that includes a transmission path and a reception path that is spatially separate from the transmission path, at least in areas. In the laser scanner, the transmission path and the reception path meet on opposite sides of an angularly movable deflection mirror of the laser scanner. An angular position of the deflection mirror in the transmission path defines a scan angle of a laser light of the laser scanner, and the angular position in the reception path compensates for an incidence angle of a reflection of the laser light.

A portable surface finishing device based on coherent light source includes a cover, a laser source, an optical calibrating module and a laser scanning module. The cover includes a beam output opening. The laser source is disposed in the cover, and is for providing a laser beam. The optical calibrating module is disposed in the cover, and the laser beam passes through the optical calibrating module. The laser scanning module is disposed in the cover, and the laser beam from the optical calibrating module passes through the laser scanning module so as to linearly output on a target surface. The laser scanning module includes a multifaceted reflective structure, a rotation driving mechanism and an F-theta lens.

This application discloses a beam scanning apparatus with arrayed rotating mirrors, and the beam scanning apparatus includes a motor (1), a worm (2), a wormgear (3), a mounting rack (4), and a rotating mirror (5), where the worm (2) and the wormgear (3) are located on the mounting rack (4), and engage with each other by using a gear (11) for a linkage connection; the rotating mirror (5) is located in the mounting rack (4), and is coaxially connected to the wormgear (3); and the motor (1) is configured to drive the worm (2) to rotate, to drive the wormgear (3) and the rotating mirror (5) to rotate coaxially. The rotating mirror (5) may be replaced with another rotating mirror (5) with a different structure and a different optical parameter, to adjust output performance of the beam scanning apparatus, thereby improving extensibility.

An image display system can include a plurality of light sources configured to emit uncollimated light, and an eyepiece waveguide having an input port configured to receive beams of light at differing angles. The image display system also includes a scanning mirror having a surface with positive optical power configured to receive light emitted by the plurality of light sources. The surface with positive optical power is configured to collimate light emitted by the plurality of light sources to form a plurality of collimated light beams and direct the plurality of collimated light beams to the input port.

A motor includes a stationary unit and a rotation unit. The rotation unit includes a rotor hub, an annular body, and a clamp. The rotor hub is mounted with a first magnet opposite to the stator. The annular body is supported on an outer circumferential portion of the rotor hub. The clamp is directly or indirectly fixed to the rotor hub farther radially inside than the annular body, and presses the annular body to an axially lower side. The rotor hub includes a flange that expands radially outside from at least a portion excluding an upper end portion. On a surface of the clamp, a pattern to be detected to detect rotation of the rotation unit positioned in a circumferential direction with the central axis as the center is provided. The annular body is sandwiched between the flange and the clamp in an axial direction.

A system and method for scanning of coherent LIDAR. The system includes a motor, a laser source configured to generate an optical beam, and a deflector. A first facet of the plurality of facets has a facet normal direction. The deflector is coupled to the motor and is configured to rotate about a rotation axis to deflect the optical beam from the laser source. The laser source is configured to direct the optical beam such that the optical beam is incident on the deflector at a first incident angle in a first plane, wherein the first plane includes the rotation axis, wherein the first incident angle is spaced apart from the facet normal direction for the first facet. A second facet of the plurality of facets includes an optical element configured to deflect the optical beam at the first incident angle into a deflected angle.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.

An optical beam steering device includes an at least partially optically transparent container having a polygonal reflector therein that is at least partially surrounded within the container by an optically transparent liquid. The polygonal reflector may be configured to have a center of mass, which is equivalent to its geometric center. In addition, the polygonal reflector may be configured so that a difference between an effective density of the polygonal reflector and a density of the optically transparent liquid is preferably less than about 2.1 grams per cubic centimeter. More preferably, the polygonal reflector and the optically transparent liquid may be collectively configured to be neutrally buoyant relative to each other within the container.