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.

Abstract: An optical scanning device includes a cylindrical aperture, a support member, and a base portion. In the aperture, an opening portion restricts a beam path width of a laser beam emitted from a light source. 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 laser scanning unit includes a light source, a deflector, and a scanning lens. A surface shape of the scanning lens is formed so as to have: non-uniform-speed scanning characteristics in which a scanning speed with the light beam is the lowest at the one end and the other end of the to-be-scanned surface and is highest at a midpoint between the one end and the other end; and image formation characteristics in which a beam diameter of the light beam is largest at the one end and the other end of the to-be-scanned surface and is the smallest at the midpoint between the one end and the other end. The non-uniform-speed scanning characteristics and the image formation characteristics are characteristics in which a peak value of an intensity distribution of the light beam at each image height is made equal to each other by a combination of both characteristics.

Abstract: An optical scanning device includes a first aperture and an adjustment mechanism. The first aperture includes a first opening portion and a first cut portion. The first opening portion restricts a beam path width of a laser beam emitted from a light source. A first blocking member that blocks the laser beam is inserted in a detachable manner in the first cut portion in a direction perpendicular to a longitudinal direction of the first opening portion, at a predetermined position of the first cut portion. The adjustment mechanism is configured to adjust a fixed state of the first aperture.

Abstract: An optical scanning device includes a light source, a scanning member, a converging lens, a first aperture, a second aperture, and a support member. The first aperture is provided between the converging lens and the scanning member and includes a first opening portion configured to restrict a beam path width in a main scanning direction of the laser beams emitted from the light source. The second aperture is provided between the light source and the converging lens and includes a second opening portion and a cylindrical portion. The second opening portion is configured to restrict a beam path width in a sub scanning direction of the laser beams emitted from the light source, and is formed in the cylindrical portion. The support member includes a cylinder supporting portion that pivotably supports the cylindrical portion of the second 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 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: An optical scanning device includes a light source, a scanning member, a converging lens, a first aperture, a second aperture, and a support member. The first aperture is provided between the converging lens and the scanning member and includes a first opening portion configured to restrict a beam path width in a main scanning direction of the laser beams emitted from the light source. The second aperture is provided between the light source and the converging lens and includes a second opening portion and a cylindrical portion. The second opening portion is configured to restrict a beam path width in a sub scanning direction of the laser beams emitted from the light source, and is formed in the cylindrical portion. The support member includes a cylinder supporting portion that pivotably supports the cylindrical portion of the second aperture.

Abstract: An optical scanning device includes a first aperture and an adjustment mechanism. The first aperture includes a first opening portion and a first cut portion. The first opening portion restricts a beam path width of a laser beam emitted from a light source. A first blocking member that blocks the laser beam is inserted in a detachable manner in the first cut portion in a direction perpendicular to a longitudinal direction of the first opening portion, at a predetermined position of the first cut portion. The adjustment mechanism is configured to adjust a fixed state of the first aperture.

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: 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 apparatus including: a MEMS mirror that deflects an optical beam output from a light source; a drive unit that drives the MEMS mirror at a constant cycle; and a photodetector device that detects the optical beam output from the light source, a deflection state of the MEMS mirror is obtained from a relationship between a phase of a drive phase signal input to the drive unit and a phase of a detection signal of the photodetector device. For example, time T is detected between output of the drive phase signal and output of the detection signal from the photodetector device, and maximum deflection angle ?m of the MEMS mirror is obtained by the equation ?m=?0/sin(2??T??/2). T is time, ?0 is an installation deflection angle of the photodetector device, and ? is a deflection frequency of the MEMS mirror.

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: In a collimator lens, in a case where divergent light emitted from a position P1 at a distance S1 from a second face enters the second face and imaging is performed at a position P2 at a distance S2 from a first face, in a temperature range of 0° C. to 60° C. and in a range of the emission wavelength of the light source which changes within the temperature range, and when a minimum value of a wavefront aberration of an image, which is generated at the position P2 by the divergent light emitted from the position P1 in a range of 0<S1/S2?50, is WF1, and when a minimum value of a wavefront aberration of an image, which is generated at the position P2 when parallel light satisfying S1=? enters the second face, is WF2, a relationship of WF1<WF2 is satisfied.

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: An optical scanning apparatus including: a MEMS mirror that deflects an optical beam output from a light source; a drive unit that drives the MEMS mirror at a constant cycle; and a photodetector device that detects the optical beam output from the light source, a deflection state of the MEMS mirror is obtained from a relationship between a phase of a drive phase signal input to the drive unit and a phase of a detection signal of the photodetector device. For example, time T is detected between output of the drive phase signal and output of the detection signal from the photodetector device, and maximum deflection angle ?m of the MEMS mirror is obtained by the equation ?m=?0/sin(2??T??/2). T is time, ?0 is an installation deflection angle of the photodetector device, and ? is a deflection frequency of the MEMS mirror.