JPH0285418U

JPH0285418U -

Info

Publication number: JPH0285418U
Application number: JP16589288U
Authority: JP
Priority date: 1988-12-21
Filing date: 1988-12-21
Publication date: 1990-07-04

Description

[Brief explanation of drawings]

第１図〜第７図は本考案による光学走査装置の
一実施例を示す図であり、第１図はその全体斜視
図、第２図ａは第１図の光学走査装置をその副走
査面内で模式的に表した図、第２図ｂは同図ａに
おける第１結像光学系の焦点位置を変化させたと
きの同様の図、第３図は像面湾曲の変動を示す線
図、第４図は像面湾曲補正機構の側面断面図、第
５図は像面湾曲補正機構の一部斜視図、第６図は
第１結像光学系の変位量を示す線図、第７図は第
１結像光学系の変位による副走査方向の像面湾曲
の補正後の残存像面湾曲を示す線図、第８図、第
９図は本考案による光学走査装置の他の実施例を
示す図であり、第８図は像面湾曲補正機構の側面
断面図、第９図は像面湾曲補正機構の一部斜視図
である。１……光源部、２……第１結像光学系、３……
回転多面鏡、３ａ……回転軸線、４……偏向反射
面、５，６……単レンズ、７……感光体、８……
第２結像光学系、１４……本体、１５……バネ、
１７，２５……ホルダー、１７ａ……突起、１８
……コロ、１９，２７……変位カム、１９ａ，２
７ａ……カム面、２１……光軸、２２，２８……
回転軸、２３，２４，２６……磁石。 1 to 7 are views showing one embodiment of the optical scanning device according to the present invention, FIG. 1 is a perspective view of the entire structure, and FIG. 2a shows the optical scanning device of FIG. 1 on its sub-scanning surface. Figure 2b is a similar diagram when the focal position of the first imaging optical system in figure a is changed, and Figure 3 is a diagram showing the variation in field curvature. , FIG. 4 is a side sectional view of the field curvature correction mechanism, FIG. 5 is a partial perspective view of the field curvature correction mechanism, FIG. 6 is a line diagram showing the amount of displacement of the first imaging optical system, and FIG. The figure is a diagram showing the residual curvature of field after correction of the curvature of field in the sub-scanning direction due to the displacement of the first imaging optical system. Figures 8 and 9 are other embodiments of the optical scanning device according to the present invention. FIG. 8 is a side sectional view of the field curvature correction mechanism, and FIG. 9 is a partial perspective view of the field curvature correction mechanism. 1... Light source section, 2... First imaging optical system, 3...
Rotating polygon mirror, 3a...Rotation axis, 4...Polarizing reflection surface, 5, 6...Single lens, 7...Photoreceptor, 8...
Second imaging optical system, 14...main body, 15...spring,
17, 25...Holder, 17a...Protrusion, 18
...Kolo, 19, 27...Displacement cam, 19a, 2
7a...Cam surface, 21...Optical axis, 22, 28...
Rotating shaft, 23, 24, 26...magnet.

Claims

[Claims for Utility Model Registration] (1) A light source unit that emits a light beam, a first imaging optical system that forms a linear image of the light beam emitted from the light source unit, and An optical scanning device comprising: a rotating polygon mirror that deflects and scans a light beam; and a second imaging optical system that images the scanning light beam deflected and scanned by the rotating polygon mirror on a photoreceptor; An optical scanning device comprising: a field curvature correction mechanism that displaces the first imaging optical system in the optical axis direction of a light beam in response to a scanning action. (2) The curvature correction mechanism includes a biasing means that biases the first imaging optical system in one direction, a driven member that moves together with the first imaging optical system, and a driven member that biases the driven member in one direction. A claim characterized in that the uneven member is moved in the other direction against the urging force of
(1) The optical scanning device described above. (3) The optical scanning device according to claim (2), wherein the biasing means is constituted by a spring means. (4) The optical scanning device according to claim (2), wherein the biasing means is constituted by magnetic means.