Abstract:
An optical scanning device includes a cylindrical aperture, a support member, and a base portion. In the aperture, an opening portion that restricts a beam path width of a laser beam emitted from a light source is formed. The support member includes a cylinder supporting portion that pivotably supports the aperture. To the base portion, the support member is fixed by adhesion fixing. The base portion includes a pass-through portion that passes through between front and rear surfaces of the base portion and allows the support member to move in direction perpendicular to a pivoting axis of the aperture. The support member has a length such that its lower end portion projects from a rear surface of the base portion in the state where the support member has been inserted in the pass-through portion to such a position where laser beam is incident in the opening portion of the aperture.
Abstract:
A light deflector includes a fixing portion, a movable portion and a reinforcing member. The movable portion includes a mirror portion for deflecting light by swinging about a predetermined swing axis, a torsion bar fixedly supported on the fixing portion and having an axis serving as the swing axis, and a supporting body configured to support the mirror portion and fixed to the torsion bar. The supporting body includes a contact surface to be held in contact with the mirror portion and a non-contact surface opposite to the contact surface. The reinforcing member is provided only on the non-contact surface out of the contact surface and the non-contact surface of the supporting body and reinforces the supporting body and adjusts a center of gravity of the movable portion so that the center of gravity of the movable portion is located on the axis.
Abstract:
An optical scanning device includes a MEMS mirror, a driving unit for oscillating the MEMS mirror using a drive voltage which varies in a basic cycle, a light detection unit for receiving laser light deflected by the MEMS mirror and outputting a detection signal, a correction value calculation unit for calculating a correction voltage value used in correcting the drive voltage, a DC voltage generation unit for generating a DC voltage having a voltage value smaller than the correction voltage value, a DC voltage amplification unit for amplifying the DC voltage generated by the DC voltage generation unit to have a voltage value equal to the correction voltage value, and a waveform shaping unit for shaping the waveform of the amplified DC voltage so that the DC voltage varies in the basic cycle and outputting the shaped DC voltage as the drive voltage to the driving unit.
Abstract:
A plurality of two-point mirror support portions each support two positions of a mirror specific surface at an end portion of each of a plurality of mirrors on a first side of a first direction. A plurality of one-point mirror support portions each support one position of the mirror specific surface or an end surface at an end portion of each of the plurality of mirrors on a second side of the first direction. A plurality of two-point lens support portions each support two positions of a lens specific surface of each of a plurality of lenses at an end portion on the second side of the first direction. A plurality of one-point lens support portions each support one position of the lens specific surface of each of the plurality of lenses at an end portion on the first side of the first direction.
Abstract:
A laser scanning unit includes a light source portion, a scanning portion, a first correction portion, and a second correction portion. The light source portion outputs a plurality of light beams. The scanning portion scans the plurality of light beams to form a plurality of electrostatic latent images, respectively corresponding to a plurality of colors including at least one reference color and at least one non-reference color, in an image forming portion. The first correction portion applies an external mechanical force to an optical element located in a path of a reference beam, corresponding to the reference color, among the plurality of light beams to correct distortion of a scan line of the reference beam. The second correction portion controls the light source portion to correct distortion of a scan line of a non-reference beam, corresponding to the non-reference color, among the plurality of light beams.
Abstract:
An optical scanner includes a multi beam light source, a scanning optical system, and a controller. The controller specifies selected beams, and changes light quantities of the respective selected beams at the same change timing based on the same profile data at respective positions in the main scanning direction which are fixedly determined as light quantity change positions. When the position of a center region in an arrangement width of the plurality of selected beams is moved in the main scanning direction in response to a selected mode of the beams, in the profile data, the controller derives a shift light quantity at a position shifted in the main scanning direction by an amount corresponding to the movement of the position of the center region, and the light quantity is modified so that the shift light quantity is used at the light quantity change position.
Abstract:
In an optical scanning device, light emitting start timings of light emitting parts with respect to a reference light emitting part are stored in a storage part. In a correction mode, a light emitting timing correction control part performs first control for allowing positions of beam spots of the light beams emitted from the light emitting parts to be equal to each other, second control for allowing a light emitting part LD4 to emit a light beam at a plurality of different start timings and patch images to be formed on a intermediate transfer belt 281, and third control for correcting light emitting start timings of light emitting parts LD2 to LD4 on the basis of the start timing of the light emitting part LD4 at which the patch images has the highest concentration.
Abstract:
A light deflector includes a fixing portion and a movable portion. The movable portion includes a mirror portion for deflecting light by swinging about a predetermined swing axis, a torsion bar fixedly supported on the fixing portion and having an axis serving as the swing axis, and a supporting body configured to support the mirror portion and fixed to the torsion bar. The supporting body includes a hole portion through which the axis passes. A mass body for adjusting a resonant frequency of the movable portion is arranged in the hole portion.
Abstract:
An optical scanning device includes a light source portion, a deflector, a first focus lens, a second focus lens, a first mirror group, and a second mirror group. The first mirror group includes: a first reflection mirror on which a first light beam having transmitted through a first focus lens is incident, the first reflection mirror reflecting the first light beam in a second direction away from a first scanned surface; and a second reflection mirror that reflects the reflected first light beam toward the first scanned surface. The second mirror group includes: a third reflection mirror on which a second light beam having transmitted through a second focus lens is incident, the third reflection mirror reflecting the second light beam in the first direction of approaching the second scanned surface; and a fourth reflection mirror that reflects the reflected second light beam toward the second scanned surface.
Abstract:
An optical scanning device includes a light source portion, a deflector, a first focus lens, a second focus lens, a first mirror group, and a second mirror group. The first mirror group includes: a first reflection mirror on which a first light beam having transmitted through a first focus lens is incident, the first reflection mirror reflecting the first light beam in a second direction away from a first scanned surface; and a second reflection mirror that reflects the reflected first light beam toward the first scanned surface. The second mirror group includes: a third reflection mirror on which a second light beam having transmitted through a second focus lens is incident, the third reflection mirror reflecting the second light beam in the first direction of approaching the second scanned surface; and a fourth reflection mirror that reflects the reflected second light beam toward the second scanned surface.