摘要:
At least one exemplary embodiment is directed to an optical scanning apparatus which includes a Vertical Cavity Surface Emitting Laser including a plurality of light-emitting portions that are spaced from each other in at least a sub-scanning direction, a first optical system including a light-condensing element that converts each of light beams from the laser into a light beam in another state; a deflector that reflects and deflects the light beams from the first optical system, and a second optical system that focuses the light beams deflected by the deflecting member on a surface to be scanned, where the second optical system includes at least an imaging optical element having an optical surface with a non-arc shape in a sub-scanning cross section.
摘要:
At least one exemplary embodiment is directed to an optical scanning apparatus which includes a Vertical Cavity Surface Emitting Laser including a plurality of light-emitting portions that are spaced from each other in at least a sub-scanning direction, a first optical system including a light-condensing element that converts each of light beams from the laser into a light beam in another state; a deflector that reflects and deflects the light beams from the first optical system, and a second optical system that focuses the light beams deflected by the deflecting member on a surface to be scanned, where the second optical system includes at least an imaging optical element having an optical surface with a non-arc shape in a sub-scanning cross section.
摘要:
A scanning optical apparatus includes a light source capable of being modulated, a deflecting element for deflecting and scanning a beam emitted from the light source, a scanning optical element for imaging the deflected beam into a spot shape on a scanned surface, and an optical element for synchronous detection for directing the deflected beam from the deflecting element to a sensor to take the timing of image writing beginning. The scanning optical apparatus further inclueds a scanning position detecting device for making the optical axis of the optical element for synchronous detection and the principal ray of the beam from the deflecting element for taking the timing of image writing beginning coincident with each other, and detecting the position of the beam at a point having at least one image height separate from the optical axis of the scanning optical element.
摘要:
A scanning optical apparatus having stable optical performance even if the characteristic of a vertical cavity surface emitting laser is fluctuated due to increase in drive current, and an image forming apparatus using the same are provided. The scanning optical apparatus comprises a converting optical system for converting a beam from the light source means having plural emission points into a beam of another state, deflecting means, and an imaging optical system for directing the deflected beam onto a scanning surface, and either pair of conditions is satisfied, 3≦Fnos
摘要:
An optical scanning device has a light shield plate where a scanning line emitted from a light source passes through a scanning lens, and is reflected by a rotation polygon mirror, and after that, passes through the scanning lens again, and is reflected by the scanning lens at the opposite side of the rotation polygon mirror by nipping the scanning lens, wherein the light shield plate is placed at a position wherein the distance between the rotation polygon mirror and the scanning lens, the thickness in the optical axial direction of the scanning lens, the angle by which the scanning line incident the rotation polygon mirror and the convergent angle of the scanning line satisfies a certain relationship.
摘要:
Provided is an optical element capable of reducing Fresnel (surface) reflection on a lens surface which causes flare or ghost, an optical system including the optical element, and an optical scanning device including the optical element. The optical element includes: a plurality of two-dimensionally arranged subwave structures having an anti-reflection function, and in the optical element when directions orthogonal to each other within a plane including a tangent of a vertex of the optical surface are set as a first and second directions, each of distances between the subwave structures changes in at least one of the first and second directions, and an arbitrary subwave structure is located with a state in which a distance between the arbitrary subwave structure and one of the subwave structures closest to the arbitrary subwave structure is shorter than ½ of an average wavelength of the light beam incident on the optical surface.
摘要:
A scanning optical apparatus includes a light source capable of being modulated, a deflecting element for deflecting and scanning a beam emitted from the light source, a scanning optical element for imaging the deflected beam into a spot shape on a scanned surface, and an optical element for synchronous detection for directing the deflected beam from the deflecting element to a sensor to take the timing of image writing beginning. The scanning optical apparatus further inclueds a scanning position detecting device for making the optical axis of the optical element for synchronous detection and the principal ray of the beam from the deflecting element for taking the timing of image writing beginning coincident with each other, and detecting the position of the beam at a point having at least one image height separate from the optical axis of the scanning optical element.
摘要:
To obtain an optical element capable of obtaining uniform antireflection characteristics over the whole optical surface having a finite curvature of the optical element, a plurality of convex optical pieces having an antireflection function are provided on a surface having the finite curvature of the optical element independently along a normal direction of the surface having the finite curvature of the optical element.
摘要:
Provided is a scanning optical system in which the influence of structural birefringence resulting from a relationship between the arrangement direction of a fine grating structure and polarization planes is reduced to obtain a preferable optical performance, and an image forming apparatus using the scanning optical system. In the scanning optical system, a light flux emitted from a light source unit is deflected by a deflection unit. The light flux deflected by the deflection unit is guided onto a surface to be scanned by a scanning optical unit having a fine structural grating on at least one optical surface. The surface to be scanned is scanned with the light flux. The fine structural grating has a triangular grating in which triangular grating parts are arranged in one dimensional direction. When a grating height of a triangular structure of the triangular grating is given by h, a grating pitch thereof is given by P, and a wavelength of the light flux emitted from the light source unit is given by λ, conditions of 0.23λ≦h and 0.52
摘要:
A scanning optical apparatus includes incident optical system for causing at least one light beam emitted from a light source to be incident on a deflection device and image formation optical system including at least one refractive optical element and at least one diffraction optical element for imaging said at least one light beam reflected and deflected by the deflection device on a surface to be scanned. The diffraction optical element has at least one of an incident surface having a convex shape in a sub-scanning cross-section facing the deflection device and an exit surface having a convex shape in the sub-scanning cross-section facing the surface to be scanned.