Optical scanning device and image forming apparatus therewith
A technology for optical devices and optical components, which is applied to optical components, equipment for electrical recording technology using charge patterns, optics, etc., and can solve problems such as scanning line shape errors, image performance degradation, and poor color registration.
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no. 1 approach
[0054] 1 is a cross-sectional view of a scanning optical device according to a first embodiment of the present invention along the main scanning direction. Fig. 2 is a cross-sectional view along the sub-scanning direction.
[0055] This embodiment uses a single lens, which is a plastic lens molded by a molding process. However, in molded lenses, the present invention can also be applied to glass molded lenses.
[0056] For example, a light source device is shown at 1 in the figure, which may include, for example, a semiconductor laser. Shown at 2 is a collimating lens, and at 3 a stop for limiting the luminous flux (quantity of light) is shown. Shown at 4 is a cylindrical lens.
[0057] Shown at 5 is a light deflector, which consists of a polygonal mirror which is rotated in the direction of the arrow by means of a drive, such as a motor. Shown at 61 is a scanning optic having an f[theta] characteristic, which in this embodiment consists of a single lens. Shown at 8 is th...
no. 2 approach
[0120] 7 is a cross-sectional view of a scanning optical device according to a second embodiment of the present invention along the main scanning direction, and FIG. 8 is a cross-sectional view along the sub-scanning direction. This second embodiment differs from the first embodiment in that a multi-beam laser is used as a light source; scanning optics are incorporated into a color imaging device; and the shapes of the light incident surface and light exit surface of the scanning optics are changed. The remainder is similar to the first embodiment.
[0121]A multi-beam laser (light source) is shown at 11 in the figure and simultaneously produces two beams (only one is shown in the figure) which are modulated independently of each other. In this embodiment, the scanning optics are incorporated into a color imaging device such as that shown in FIG. 9 . More specifically, the apparatus shown in FIG. 9 is a color imaging apparatus in which a plurality of light beams from a plural...
no. 3 approach
[0136] 13 is a sectional view along the main scanning direction of a scanning optical device according to a third embodiment of the present invention, and FIG. 14 is a sectional view along the sub scanning direction. This third embodiment differs from the first embodiment in that the shapes of the light-incident surface and the light-exit surface of the scanning optics are varied, and the scanning optics are incorporated into the imaging device. The remainder is similar to the first embodiment.
[0137] Figure 15 shows the design data in this embodiment.
[0138] In this embodiment, the scanning optical element 63 has a light incident surface forming an aspherical shape along the main scanning direction, and the element forms a convex toric surface along the sub scanning direction. As for the light exit surface, it is formed in a non-spherical shape along the main scanning direction, and along the sub scanning direction it is formed in a deformed toric surface having a circul...
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