Abstract: A scanline curvature correction mechanism includes a holding mechanism to extend in a main scanning direction and hold an optical element in the main scanning direction, a pressing member provided near a center of the optical element in the main scanning direction and press the optical element of the optical scanning device in the sub-scanning direction, and a curvature adjustment mechanism provided on an opposite side of the pressing member with the optical element interposed therebetween and to adjust a curvature of the optical element in the sub-scanning direction. The curvature adjustment mechanism includes an eccentric cam to rotate around a rotation axis parallel to an optical axis of the optical element and include a cam portion of which an outer peripheral surface is eccentric with respect to the rotation axis, and a fixing mechanism to stepwisely fix an angular position of rotation of the eccentric cam.

Abstract: An optical scanning device deflects light for scanning in a main scanning direction and includes a plurality of light sources, a plurality of photodetectors, a plurality of optical element groups, and a polygon mirror. The plurality of light sources emit laser lights. The plurality of photodetectors detect beams formed by the laser lights. The plurality of optical element groups guide the beams to the photodetectors. The polygon mirror deflects the beams for scanning in one direction of the main scanning direction from one end to the other end on the opposite side of the one end. The plurality of optical element groups cross a crossing axis parallel to the main scanning direction, cross a rotation axis of the polygon mirror, and are rotationally symmetrical with respect to an axis of symmetry parallel to the rotation axis of the polygon mirror.

Abstract: An optical scanning device includes a light source, a photodetector, an optical element group, and a polygon mirror. The light source is configured to emit laser light. The photodetector is configured to detect a beam formed with the laser light. The optical element group is configured to guide the beam to the photodetector. The polygon mirror is configured to perform deflection scanning on the beam, which deflects the beam from a first end in one direction of a main scanning direction to a second end on a side opposite to the first end of the main scanning direction. The beam is incident on the same side of the photodetector when the beam is deflected toward the first end and the second end by the polygon mirror.

Abstract: A scanline curvature correction mechanism includes a holding mechanism to extend in a main scanning direction and hold an optical element in the main scanning direction , a pressing member provided near a center of the optical element in the main scanning direction and press the optical element of the optical scanning device in the sub-scanning direction, and a curvature adjustment mechanism provided on an opposite side of the pressing member with the optical element interposed therebetween and to adjust a curvature of the optical element in the sub-scanning direction. The curvature adjustment mechanism includes an eccentric cam to rotate around a rotation axis parallel to an optical axis of the optical element and include a cam portion of which an outer peripheral surface is eccentric with respect to the rotation axis, and a fixing mechanism to stepwisely fix an angular position of rotation of the eccentric cam.

Abstract: An optical element includes an optical surface for giving an optical effect to a light beam that passes therethrough. The optical surface includes a first region and a second region. The first region and the second region are smoothly continuous with each other. The optical surface has an absolute value of a maximum curvature at a boundary between the first region and the second region. The absolute value of the maximum curvature is smaller than a predetermined value.

Abstract: An optical device includes a first light source emitting a first beam, a second light source emitting a second beam and arranged upstream in a scanning direction, a diaphragm including an opening passing portions of the first beam, the first portion having a first width from the light axis of the first beam on the upstream side, the second portion having a second width from the light axis on the downstream side, the first width narrower than the second width, and an opening passing portions of the second beam, the first portion having a third width from the light axis of the second beam on the upstream side, the second portion having a fourth width from the second light axis on the downstream side, the third width wider than the fourth width, and a deflector deflecting on a surface thereon the beams at positions shifted in a sub scanning direction.

Abstract: An optical device includes a first light source emitting a first beam, a second light source emitting a second beam and arranged upstream in a scanning direction, a diaphragm including an opening passing portions of the first beam, the first portion having a first width from the light axis of the first beam on the upstream side, the second portion having a second width from the light axis on the downstream side, the first width narrower than the second width, and an opening passing portions of the second beam, the first portion having a third width from the light axis of the second beam on the upstream side, the second portion having a fourth width from the second light axis on the downstream side, the third width wider than the fourth width, and a deflector deflecting on a surface thereon the beams at positions shifted in a sub scanning direction.

Abstract: There is provided a signaling apparatus including a plurality of LED elements provided in a signal lamp body; a transparent panel provided in the LED elements and configured to transmit outgoing light from the LED elements on a rear side to a front surface to which snow adheres; a frame unit provided on an outer periphery of the panel; and vibration generators provided in the frame unit and configured to vibrate the panel.

Abstract: An optical scanning device includes plural sets of optical paths, and in each set of optical paths, first and second light beams emitted from the two light sources having an opening angle in the main scanning direction are orthogonal to a deflection axis of a deflector and are deflected and scanned by the same surface of the deflector at different positions deviating from each other in a deflection axis direction. A first imaging optical element gives positive optical power to the deflected light beams to converge the light beams. A focal position exists between the first imaging optical element and a second imaging optical element arranged on the optical paths in front of first and second surfaces to be scanned on two photoconductive drums. A separation distance exists between the light beams.

Abstract: An optical scanning device includes a first light source, a second light source, a first aperture, a second aperture, a third aperture, and a deflector. The first light source emits a first light flux. The second light source emits a second light flux. The second light flux is separated from the first light flux by an opening angle in a main scanning direction. The first aperture shapes a beam shape of the first light flux in a sub-scanning direction. The second aperture shapes a beam shape of the second light flux in the sub-scanning direction. The third aperture shapes the beam shape of the first light flux and the beam shape of the second light flux. The deflector deflects the first light flux and the second light flux at positions separated in the sub-scanning direction on a surface.

Abstract: An optical scanning device includes a first light source, a second light source, a first aperture, a second aperture, a third aperture, and a deflector. The first light source emits a first light flux. The second light source emits a second light flux. The second light flux is separated from the first light flux by an opening angle in a main scanning direction. The first aperture shapes a beam shape of the first light flux in a sub-scanning direction. The second aperture shapes a beam shape of the second light flux in the sub-scanning direction. The third aperture shapes the beam shape of the first light flux and the beam shape of the second light flux. The deflector deflects the first light flux and the second light flux at positions separated in the sub-scanning direction on a surface.

Abstract: There is provided a signaling apparatus including a plurality of LED elements provided in a signal lamp body; a transparent panel provided in the LED elements and configured to transmit outgoing light from the LED elements on a rear side to a front surface to which snow adheres; a frame unit provided on an outer periphery of the panel; and vibration generators provided in the frame unit and configured to vibrate the panel.

Abstract: An optical scanning device includes light sources, a deflector deflecting light beams emitted from the light sources, a first lens transmitting the light beams deflected by the defector, and second lenses guiding the light beams transmitted from the first lens to respective surfaces to be scanned. The second lenses are arranged so that a first incident position of a first light beam emitted by a first light source and entering one of the second lenses is closer to the respective surface to be scanned along an optical axis of the first lens than a second incident position of a second light beam emitted by a second light source and entering another of the second lenses, and an incident angle of the second light beam with respect to the optical axis along a deflection direction by the deflector is greater than the incident angle of the first light beam.

Abstract: There is provided a signaling apparatus including a plurality of LED elements provided in a signal lamp body; a transparent panel provided in the LED elements and configured to transmit outgoing light from the LED elements on a rear side to a front surface to which snow adheres; a frame unit provided on an outer periphery of the panel; and vibration generators provided in the frame unit and configured to vibrate the panel.

Abstract: An optical scanning device includes light sources, a deflector deflecting light beams emitted from the light sources, a first lens transmitting the light beams deflected by the defector, and second lenses guiding the light beams transmitted from the first lens to respective surfaces to be scanned. The second lenses are arranged so that a first incident position of a first light beam emitted by a first light source and entering one of the second lenses is closer to the respective surface to be scanned along an optical axis of the first lens than a second incident position of a second light beam emitted by a second light source and entering another of the second lenses, and an incident angle of the second light beam with respect to the optical axis along a deflection direction by the deflector is greater than the incident angle of the first light beam.

Abstract: An optical scanning device includes plural sets of optical paths, and in each set of optical paths, first and second light beams emitted from the two light sources having an opening angle in the main scanning direction are orthogonal to a deflection axis of a deflector and are deflected and scanned by the same surface of the deflector at different positions deviating from each other in a deflection axis direction. A first imaging optical element gives positive optical power to the deflected light beams to converge the light beams. A focal position exists between the first imaging optical element and a second imaging optical element arranged on the optical paths in front of first and second surfaces to be scanned on two photoconductive drums. A separation distance exists between the light beams.

Abstract: An optical scanning device includes plural sets of optical paths, and in each set of optical paths, first and second light beams emitted from the two light sources having an opening angle in the main scanning direction are orthogonal to a deflection axis of a deflector and are deflected and scanned by the same surface of the deflector at different positions deviating from each other in a deflection axis direction. A first imaging optical element gives positive optical power to the deflected light beams to converge the light beams. A focal position exists between the first imaging optical element and a second imaging optical element arranged on the optical paths in front of first and second surfaces to be scanned on two photoconductive drums. A separation distance exists between the light beams.

Abstract: An optical scanning device includes plural sets of optical paths, and in each set of optical paths, first and second light beams emitted from the two light sources having an opening angle in the main scanning direction are orthogonal to a deflection axis of a deflector and are deflected and scanned by the same surface of the deflector at different positions deviating from each other in a deflection axis direction. A first imaging optical element gives positive optical power to the deflected light beams to converge the light beams. A focal position exists between the first imaging optical element and a second imaging optical element arranged on the optical paths in front of first and second surfaces to be scanned on two photoconductive drums. A separation distance exists between the light beams.

Abstract: The optical scanning apparatus comprises a plurality of light sources; a light deflection member configured to deflect luminous flux from the plurality of the light sources to a main scanning direction; and a plurality of turning back mirrors configured to reflect luminous flux deflected in the main scanning direction by the light deflection member towards a scanning object moving in a sub-scanning direction. Adjustment mechanisms are selectively mounted in the turning back mirrors in which reflection directions with respect to incident directions of the luminous flux at the time of being developed excluding the other turning back mirrors in the middle to adjust postures and shapes thereof in a state in which optical paths from the plurality of the turning back mirrors to the corresponding scanning objects are fixed at the scanning object side which is an image surface.

Abstract: There is provided a signaling apparatus including a plurality of LED elements provided in a signal lamp body; a transparent panel provided in the LED elements and configured to transmit outgoing light from the LED elements on a rear side to a front surface to which snow adheres; a frame unit provided on an outer periphery of the panel; and vibration generators provided in the frame unit and configured to vibrate the panel.