A control unit to control a movement of a reflector includes a drive signal output unit to apply a drive voltage having a minimum value and a maximum value in one cycle to a piezoelectric element to deform the piezoelectric element, the deformation of the piezoelectric element causing the reflector to move, and circuitry to control the drive voltage to have the minimum value greater than a zero voltage by a given difference value.

A laser scanning unit (LSU) identification method and an image forming device are provided. The image forming device includes a processor and a target LSU, where the target LSU includes a laser diode, a laser diode drive unit, a polygon mirror, and a motor. The method includes providing a signal related to a quantity of reflective surfaces of the polygon mirror to the processor by the target LSU; identifying the quantity of the reflective surfaces of the polygon mirror of the target LSU according to the signal related to the quantity of the reflective surfaces of the polygon mirror provided by the target LSU, and determining a control parameter of the target LSU according to an identified quantity of the reflective surfaces by the processor, thereby controlling the target LSU according to the control parameter; and operating according to the control parameter by the target LSU.

An ophthalmic apparatus includes: a light source; a measurement optical system that irradiates an eye with light from the source and guides reflected light from the eye; a reference optical system that guides the light from the source to use the light from the source as reference light; an abnormality detection optical system that has an optical path length of a predetermined length and to guide the light from the source to use the light from the source as abnormality detection light; a light receiving element that receives measurement interference light being combination of the reflected light from the eye and the reference light and abnormality detection interference light being combination of the abnormality detection light and the reference light, and the ophthalmic apparatus determines whether the measurement interference light is abnormal based on waveform of an abnormality detection interference signal outputted from the light receiving element.

According to one example, there is provided an imaging system that comprises a housing, a rotatable polygon comprising multiple mirrored facets located in the housing, a laser to generate a laser beam to shine onto the polygon mirror and to reflect onto a target, and wherein, in use, the density of gas within the housing is such that turbulence-related optical distortion within the housing is not greater than a predetermined limit.

An encoded illumination real-time focusing scanning imaging device includes an LED array, an object stage, an objective lens, a liquid lens, a lens sleeve, and a camera. The object stage is used for placing a sample, the LED array is used for emitting bright field light or encoded light, and the bright field light or the encoded light respectively penetrates through the sample and then successively passes through the objective lens, the liquid lens, and the lens sleeve to reach the camera to shoot a bright field image or an encoded light illumination image by the camera. The present invention also discloses an encoded illumination real-time focusing scanning imaging method, which is performed by using the above-mentioned device. The present invention enables fast and accurate focusing at a low cost.

An optical unit includes: a base which includes a main surface; a mirror device which includes a movable mirror portion and is disposed on the base; a frame member that is provided on the main surface so as to surround the mirror device; and a window member that is bonded to the frame member and has a flat plate shape. The frame member includes a first wall portion which is provided on the main surface and includes a first top surface on the side opposite to the main surface, a second wall portion which is provided on the main surface so as to face the first wall portion and includes a second top surface on the side opposite to the main surface.

A laser system including a laser source that generates a laser beam and an optical switch that receives the laser beam and selectively sends the laser beam to either a fast path or a slow path, wherein in the fast path the laser beam has a first F/# and in the slow path the laser beam has a second F/# that is higher in value that of the first F/#. The laser system further including an afocal optical system that is in the slow path and receives the laser beam from the optical switch and an x-y scanner that receives either a first laser beam from the slow path or a second laser beam from the fast path. The laser system including a scan lens system that receives a scanning laser beam from the x-y scanner and performs a z-scan for the scanning laser beam only in the case wherein the scanning laser beam is generated from the laser beam in the fast path. The laser system further including an aspheric patient interface device that receives a laser beam from the scan lens system.

Provided is a light beam emission device and a light beam projection device, that are downsizable, have a simple configuration, and simplify complicated processing of video signals, such as the timing adjustment of video output signals, without generating color irregularity. The devices include: a plurality of light sources; and a condensing member. A range in the light source array direction, in which emission spots of the light beams emitted from the plurality of light sources respectively exist, is within a size in the array direction of a light beam, immediately after the light beam emitted from an emission spot located most closely to the center of the plurality of light sources, with respect to the condensing member, passed through the condensing member.

A mirror unit includes an optical scanning device, a frame member, and a window member. The frame member includes first and second wall portions facing each other in an X-axis direction. The first wall portion is higher than the second wall portion. The window member is disposed on a top surface of the first wall portion and a top surface of the second wall portion and is inclined with respect to a mirror surface of the optical scanning device. In a cross-section parallel to the X-axis direction, the first wall portion is separated from a first line passing through a first end at a side of the first wall portion in the mirror surface and a first corner portion formed at the side of the first wall portion by an outer surface opposite to the frame member and a first side surface in the window member.

An optical system includes first and second optical scanners and first and second gradient-index (GRIN) lenses. The first optical scanner is configured to scan a laser beam in a first scanning path and output a first scanned beam. The first GRIN lens is configured to translate the first scanned beam therethrough. The second optical scanner is configured to scan the first scanned beam in a second scanning path and output as second scanned beam. The second scanning path has a scanning trajectory rotated by 90 degrees relative to the first scanning path. The second GRIN lens is configured to translate the second scanned beam therethrough and collect the emitted signal from the imaging target.